Energy storage cabinet heating method, energy storage cabinet and storage medium

Abstract

The invention discloses an energy storage cabinet heating method, an energy storage cabinet and a storage medium. The energy storage cabinet comprises a battery pack; the heating piece is connected with a mains supply and is used for heating the battery pack by utilizing the mains supply; the control circuit is connected with the battery pack and the heating piece; the method is applied to the control circuit and comprises the steps that a target temperature is obtained, the target temperature is larger than a fast charging temperature lower limit threshold value, and the fast charging temperature lower limit threshold value is the lowest temperature at which the battery pack can fast charge an external battery pack; the charging state of the battery pack is detected, and after charging of the battery pack is completed, the heating piece is controlled to heat the battery pack based on the target temperature, the charging efficiency of the battery pack is improved, and the use experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage cabinet heating, and in particular to an energy storage cabinet heating method, an energy storage cabinet and a storage medium. Background Art

[0002] With the continuous breakthroughs in technology in the field of new energy, energy storage cabinets are increasingly becoming the main energy source for electrical equipment.

[0003] In the prior art, a battery pack is provided in an energy storage cabinet for fast or slow charging of an external battery pack. Since the battery pack is affected by temperature, the battery pack cannot be discharged quickly in extreme weather, resulting in low charging efficiency of the battery pack, affecting user experience. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides an energy storage cabinet heating method, an energy storage cabinet and a storage medium.

[0005] According to a first aspect of an embodiment of the present disclosure, a method for heating an energy storage cabinet is provided, and the energy storage cabinet includes:

[0006] Battery pack;

[0007] A heating element, connected to the mains, for heating the battery pack using the mains;

[0008] A control circuit connected to the battery pack and the heating element;

[0009] The method is applied in a control circuit, and the method includes:

[0010] Get the target temperature. The target temperature is greater than the lower limit threshold of the fast charge temperature. The lower limit threshold of the fast charge temperature is the lowest temperature at which the battery pack can be fast charged to the external battery pack. The fast charge rate is greater than or equal to 2C.

[0011] The charging state of the battery pack is detected, and after the battery pack is fully charged, the heating element is controlled to heat the battery pack based on the target temperature.

[0012] Optionally, controlling the heating element to heat the battery pack based on the target temperature includes:

[0013] Get the current temperature of the battery pack;

[0014] In response to a difference between the target temperature and the current temperature being within a preset range, the heating element is controlled to heat the battery pack.

[0015] Optionally, controlling the heating element to heat the battery pack includes:

[0016] In the process of heating the battery pack, obtaining a first current battery temperature;

[0017] In response to the first current battery temperature being greater than or equal to the target temperature, the heating element is controlled to stop heating.

[0018] Optionally, the method further includes:

[0019] After stopping heating the battery pack, obtaining a second current battery temperature;

[0020] In response to the second current battery temperature being less than the target temperature, the heating element is controlled to heat the battery pack based on the target temperature.

[0021] Optionally, the method further includes:

[0022] Before starting to charge the battery pack, obtaining a third current battery temperature;

[0023] In response to the third current battery temperature being less than the first charging temperature threshold, controlling the heating element to heat the battery pack;

[0024] In response to heating to a second charging temperature threshold, controlling the heating element to stop heating and charging the battery pack;

[0025] The second charging threshold is greater than the first charging threshold.

[0026] Optionally, the method further includes:

[0027] Before the battery pack charges the external battery pack, obtaining a fourth current battery temperature;

[0028] In response to a fourth current battery temperature being greater than or equal to a fast charge temperature lower limit threshold, entering a fast charge mode so that the battery pack quickly charges the battery pack with a first current;

[0029] In response to the fourth current battery temperature being less than the fast-charging temperature lower limit threshold, a slow-charging mode is entered so that the battery pack slowly charges the battery pack with a second current.

[0030] Optionally, controlling the heating element to heat the battery pack based on the target temperature includes:

[0031] Get the start working time;

[0032] Determine the heating time based on the current temperature and the target temperature of the battery pack;

[0033] Determine the start time of the heating element based on the heating time and the start working time;

[0034] In response to reaching the start-up time, the battery pack is heated.

[0035] Optionally, controlling the heating element to heat the battery pack based on the target temperature includes:

[0036] Get working hours and outdoor ambient temperature;

[0037] The target temperature is corrected according to the working time and the outdoor ambient temperature to obtain the current target temperature;

[0038] The heating element is controlled to heat the battery pack based on the current target temperature.

[0039] According to a second aspect of an embodiment of the present disclosure, there is provided an energy storage cabinet, comprising: a battery pack; a heating element connected to AC power and used to heat the battery pack using AC power; a control circuit connected to the battery pack and the heating element; the control circuit comprising: a target temperature acquisition module configured to acquire a target temperature, the target temperature being greater than a fast charging temperature lower limit threshold, the fast charging temperature lower limit threshold being the lowest temperature at which the battery pack can fast charge an external battery pack, and the fast charging rate being greater than or equal to 2C; a heating module configured to detect a charging state of the battery pack, and after the battery pack is charged, control the heating element to heat the battery pack based on the target temperature.

[0040] According to a third aspect of an embodiment of the present disclosure, an embodiment of the present application provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0041] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: by obtaining the target temperature before charging, the heating element can be controlled to charge the battery pack based on the target temperature after charging is completed, so that the temperature of the battery pack when the energy storage cabinet is working can still be higher than the lower limit threshold of the fast charging temperature, so that the energy storage cabinet can still quickly charge the external battery pack in a working scenario with lower temperature, thereby improving the charging efficiency of the battery pack and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of a process for heating an energy storage cabinet provided in an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of the structure of an energy storage cabinet in an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the structure of another energy storage cabinet in an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of the structure of a control circuit of an energy storage cabinet provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0047] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0048] It should be understood that, although the terms first, second, third, etc. may be used to describe various information in this article, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this article, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination". Furthermore, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising", "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, “A, B, or C” or “A, B and / or C” means “any of the following: A; B; C; A and B; A and C; B and C; A, B, and C.” An exception to this definition will occur only when a combination of elements, functions, steps, or operations are inherently mutually exclusive in some manner.

[0049] It should be understood that, although the various steps in the flowchart in the embodiment of the present application are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and it can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0050] It should be noted that in this article, step codes such as S102 and S104 are used for the purpose of expressing the corresponding content more clearly and concisely, and do not constitute a substantial limitation on the sequence. When implementing the step, those skilled in the art may execute S104 first and then S102, etc., but these should all be within the scope of protection of this application.

[0051] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0052] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application and have no specific meaning. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0053] Considering that the energy storage cabinet currently needs to charge the external battery pack with its internal battery pack when working outdoors at a relatively low temperature, in order to improve the charging efficiency, a fast charging circuit can be provided inside the energy storage cabinet. When the temperature of the battery pack is higher than the lower threshold of the fast charging temperature, the fast charging circuit can be turned on to quickly charge the external battery pack. In the existing design, when the temperature of the battery pack is low, if the battery pack needs to be quickly charged, the battery pack's own electrical energy is often used to power the heating element. After reaching the fast charging allowable temperature, the battery pack is quickly charged, resulting in low effective utilization of the battery pack power, or only slow charging of the battery pack, affecting the user experience.

[0054] Therefore, when users encounter the above problems, they may have the following requirements: to meet the requirements of fast charging of external battery packs during the operation of the energy storage cabinet, and to maximize the effective utilization rate of the battery pack power. In other words, it is necessary to solve the problem of how the existing energy storage cabinet can improve the effective utilization rate of the battery pack power while taking into account fast discharge. Figure 2As shown, the energy storage cabinet may include at least a battery pack, a heating element and a control circuit. The battery pack is used to store electrical energy. The battery pack may be composed of multiple groups of cells connected in series. The battery pack may be provided with a discharge end and a charging end. The discharge end of the battery pack is connected to the input end of the first discharge circuit and the input end of the second discharge circuit. The first discharge circuit and the second discharge circuit are connected in parallel. The output end of the first discharge circuit and the output end of the second discharge circuit are connected to the discharge interface, and the discharge interface is used to connect to the battery pack. The charging end of the battery pack is connected to the charging interface, and the charging interface is used to connect to the mains so that the external mains charges the battery pack; when the first discharge interface is connected to the external battery pack, the battery pack quickly charges the connected battery pack at a fast charge rate, and when the second discharge interface is connected to the external battery pack, the battery pack slowly charges the connected battery pack at 1C. 1C is the ratio of the battery pack capacity to one hour. For example, if the battery pack capacity is 20AH, then 1C means 20A. If the battery pack capacity is 200AH, then 1C means 200A.

[0055] Optionally, a heating element is disposed in the energy storage cabinet and close to the battery pack to heat the battery pack, or a heating element is disposed inside the battery pack to heat the battery cells inside the battery pack. The specific position of the heating element is not specifically limited in the embodiments of this specification. A temperature sensor is disposed on the outer surface or inside the battery pack to monitor the temperature of the battery pack or the temperature of the battery cell. A control circuit is connected to the battery pack, the heating element and the temperature sensor, and the control circuit is used to execute the energy storage cabinet heating method in this application.

[0056] Based on this, the present application proposes a method for heating an energy storage cabinet. It should be noted that although the present disclosure provides the method operation steps as shown in the following embodiments or drawings, more or fewer operation steps may be included in the method based on routine or no creative labor. In the steps that do not logically have a necessary causal relationship, the execution order of these steps is not limited to the execution order provided in the embodiments of the present disclosure.

[0057] See also Figure 1 , Figure 1 This is a flow chart of a method for heating an energy storage cabinet provided in an embodiment of this specification. This is a method for heating an energy storage cabinet provided in an embodiment of this application. This method can be executed by a control device or the above-mentioned control circuit of an energy storage cabinet provided in an embodiment of this application. The device or control circuit can be implemented in software and / or hardware. In this embodiment, the execution subject of the method is the control circuit. The method provided in this embodiment includes:

[0058] Step S102: Obtain target temperature.

[0059] In the disclosed embodiment, the battery pack may be composed of multiple groups of battery cells connected in series, each group of battery cells may be composed of multiple single batteries connected in series, and the battery pack may be an energy storage device for storing electrical energy. It is understood that the battery capacity of the battery pack is greater than the battery capacity of the external battery pack, so that the battery pack can charge the battery pack. In order to reduce the length of the charging cable between the external battery pack and the battery pack, the battery pack may be arranged inside the energy storage cabinet, that is, at least one discharge interface for charging the battery pack is arranged inside the energy storage cabinet.

[0060] Optionally, the energy storage cabinet may further include: at least one battery pack, which is detachably connected to a discharge interface of the battery group.

[0061] Specifically, the lower limit threshold of fast charge temperature is used to characterize the lowest temperature at which the battery pack can fast charge the external battery pack. It is understandable that battery activity is related to battery characteristics, and different battery packs may correspond to different lower limit thresholds of fast charge temperature. In the embodiments of this specification, the lower limit threshold of fast charge temperature can be determined by the control circuit based on the battery characteristics in the battery pack, or the staff of the energy storage cabinet writes the lower limit threshold of fast charge temperature into the control circuit when it leaves the factory, or the control circuit determines it based on the historical discharge data of the battery pack. Therefore, the specific method of obtaining the lower limit threshold of fast charge temperature is not limited in the embodiments of this specification. Among them, the charging rate of fast charge can be greater than or equal to 2C, such as 3C, 4C, 10C, etc.

[0062] Optionally, the charging rate of fast charging may also be equal to 1C, and correspondingly, the charging rate of slow charging may be a value less than 1C, such as 0.5C.

[0063] Specifically, the target temperature represents the temperature value that the battery pack needs to be heated. The target temperature can be greater than the lower limit threshold of the fast charging temperature to overcome the temperature attenuation of the battery pack when the energy storage cabinet is working and meet the battery pack's requirement for fast charging of the external battery pack. For example, if the lower limit threshold of the fast charging temperature is 15 to 25 degrees Celsius, the target temperature can be 40 degrees Celsius accordingly. The difference between the target temperature and the lower limit threshold of the fast charging temperature can be set according to the temperature of the working scene. For example, in a working scene at minus 20 degrees Celsius, the temperature of the battery pack decays faster. Before the working scene works, the target temperature can be set to 50 degrees Celsius. For another example, in a working scene at minus 25 degrees Celsius, the temperature of the battery pack decays faster. Before the working scene works, the target temperature can be set to 53 degrees Celsius. That is, the lower the working scene temperature, the greater the difference between the target temperature and the lower limit threshold of the fast charging temperature.

[0064] Specifically, the target temperature may be input by the operator through a key when charging the energy storage cabinet. It is understandable that a control area for the operator to input the target temperature may be provided on the energy storage cabinet, and the control area may be provided on the outer wall of the energy storage cabinet in the form of a key. When the operator is charging the battery pack or after the battery pack is charged, the operator may set the target temperature through the key in the control area.

[0065] Alternatively, the target temperature may be pre-stored in the control circuit. For example, when the energy storage cabinet is produced or assembled, the target temperature (eg, 40 degrees Celsius) may be stored in the control circuit.

[0066] Alternatively, the target temperature may also be determined by the control circuit in the energy storage cabinet based on the outdoor ambient temperature. It is understandable that the control circuit may obtain the outdoor ambient temperature by wired or wireless means, and determine the target temperature based on the obtained outdoor ambient temperature. The way in which the control circuit determines the target temperature is the same as the strategy input by the operator mentioned above, which will not be repeated here.

[0067] Step S104: Detect the charging state of the battery pack, and after the battery pack is fully charged, control the heating element to heat the battery pack based on the target temperature.

[0068] Specifically, the charging state of the battery pack can be used to indicate the charging stage of the battery pack. The charging state of the battery pack can include: charging state and charging completion state. The charging state is the state in which the battery pack is being charged, and the corresponding charge is less than 100% and / or the corresponding voltage is less than the rated voltage; the charging completion state is the state in which the charge of the battery pack is 100% and / or the corresponding battery pack voltage is the rated voltage. That is, during the overcharging process, the control circuit can monitor the charge and / or voltage of the battery pack connected thereto in real time, and judge whether the battery pack is fully charged by the charge and / or battery pack voltage. For example, when the control circuit detects that the charge of the battery pack is 100% and / or the voltage of the battery pack is the rated voltage, it can be confirmed that the battery pack is fully charged. Alternatively, the control circuit can detect the charging status by checking the charging current of the charging interface, such as: the current of the battery pack during charging is 20A, and accordingly, the charging current obtained by the control circuit is 20A. The control circuit can determine that the battery pack is in a charging state based on the charging current (20A). The specific way to determine the charging state can be that the control circuit compares the obtained charging current with a pre-stored reference current. When the obtained charging current is greater than the reference current, it is determined that the battery pack is in a charging state. When the obtained charging current is less than the reference current, it is determined that the battery pack is in a charging completion state. It can be understood that the way the control circuit determines the charging state through the charge or voltage is the same as the above-mentioned charging current method, and will not be repeated.

[0069] Specifically, the heating element can be a device that consumes electrical energy to heat the outer surface of the battery pack or the battery cells inside the battery pack, such as PTC, etc., wherein PTC is the abbreviation of Positive Temperature Coefficient, which generally refers to semiconductor materials or components with a large positive temperature coefficient. The temperature is increased by energizing the thermistor so that the resistor generates heat. In order to better understand the present application, the heating of the battery pack by PTC is described in the embodiments of this specification: the PTC can be connected to the control circuit so that the control circuit can control the start or stop of the PTC. The PTC can also be connected to the mains through the charging interface of the energy storage cabinet. After the energy storage cabinet is charged, the control circuit can conduct the PTC power circuit to heat the battery pack. In some optional embodiments, the PTC can also be electrically connected to the battery pack, that is, the PTC can use the mains or the electrical energy in the battery pack when working.

[0070] For example, a PTC is set within a preset distance outside the battery pack in the energy storage cabinet. Before the battery pack is charged, the control circuit can obtain the heating temperature of 50 degrees Celsius (target temperature) input by the operator. The control circuit stores the lower limit threshold of the fast charging temperature of the battery pack of 15 to 25 degrees Celsius. When the charge of the battery pack is detected to be 100%, the PTC power circuit is controlled to start, and the AC power is used to power the PTC, so that the PTC heats the battery pack.

[0071] It is understandable that the PTC can be connected to the mains via the charging interface, or connected to the battery pack via the third discharge interface, and then the mains or the battery pack can be selectively connected when the PTC is in use. Using the battery pack power to charge the battery pack will inevitably reduce the effective utilization rate. In order to improve the effective utilization rate of the battery pack power, preferably, after charging is completed, the mains is used to power the PCT, that is, the power consumed by the PTC to heat the battery pack is provided by the mains, where the effective utilization rate can be understood as the ratio of the power consumed by the battery pack to discharge the external battery pack to the power of the battery pack itself.

[0072] It is understood that the embodiments of this specification control the heating element to heat the battery pack immediately after the battery pack is charged, or control the heating element to heat the battery pack after a preset time after the battery pack is charged. The specific time for controlling the heating element to heat the battery pack is not specifically limited in the embodiments of this specification.

[0073] In summary, in the method provided in the above embodiment, by obtaining the target temperature before charging, the heating element can be controlled to charge the battery pack based on the target temperature after charging is completed, so that the temperature of the battery pack can still be higher than the lower limit threshold of the fast charging temperature when the energy storage cabinet is working, and then the battery pack can realize the fast charging mode to charge the external battery pack, so that the energy storage cabinet can still quickly charge the external battery pack in a working scenario with lower temperature, thereby improving the charging efficiency of the battery pack and enhancing the user experience.

[0074] In a possible implementation, step 104: controlling the heating element to heat the battery pack based on the target temperature includes:

[0075] Step 202: Obtain the current temperature of the battery pack;

[0076] Specifically, the current temperature of the battery pack can be detected by a temperature sensor connected to the control circuit. A temperature sensor (temperature transducer) refers to a sensor that can sense temperature and convert it into a usable output signal. The temperature sensor is used to detect the temperature of the battery pack, such as the temperature of the outer surface of the battery pack or the temperature of the battery cell inside the battery pack. It is understandable that other devices with the same function as the temperature sensor can replace the above-mentioned temperature sensor, and accordingly, other devices that can detect the temperature of the battery pack are all solutions protected by this embodiment.

[0077] Specifically, the current temperature of the battery pack may refer to the temperature of the battery pack detected by the temperature sensor after the battery pack is charged. It is understandable that during the charging process of the battery pack, the chemical reaction inside the battery cell will generate heat, which will cause the temperature of the battery pack to rise. In the embodiment of this specification, the temperature sensor is used to detect the temperature of the battery pack only after charging is completed, which reduces the use time of the temperature sensor, thereby increasing the service life of the temperature sensor, and at the same time achieving the accuracy of the battery pack heating control, avoiding the temperature obtained in other charging states being lower than the temperature obtained at the beginning of heating, causing the heating strategy of the battery pack's heating element to deviate.

[0078] Step 204: In response to the difference between the target temperature and the current temperature being within a preset range, controlling the heating element to heat the battery pack.

[0079] Specifically, in response to the difference between the target temperature and the current temperature being within a preset range, the heating element is controlled to heat the battery pack. This can be understood as: determining whether the difference between the target temperature and the current temperature of the battery pack is within a preset range; if the difference between the target temperature and the current temperature of the battery pack is within the preset range, the heating element is controlled to heat the battery pack based on the target temperature.

[0080] In a specific real-time process, a heating instruction can be triggered when the difference between the target temperature and the current temperature is within a preset range. The control circuit can respond to the heating instruction and turn on the power supply circuit of the heating element to control the heating element to heat the battery pack.

[0081] It is understandable that the heating instruction can be used to turn on the heating element to heat the battery pack.

[0082] Specifically, the preset range may be a value range of the temperature difference preset according to usage requirements.

[0083] The lower limit value of the preset range may be less than the fast charge temperature lower limit threshold, greater than the fast charge temperature lower limit threshold, or equal to the fast charge temperature lower limit threshold.

[0084] Specifically, the lower limit value of the preset range may be greater than 0, such as the preset range is 5 to 30 degrees Celsius, when the difference between the target temperature and the current temperature of the battery pack is between 5 and 30 degrees Celsius, the control circuit controls the heating element to heat the battery pack, that is, only when the target temperature is greater than the current temperature of the battery pack, the control circuit controls the heating element to heat the battery pack; the lower limit value of the preset range may be equal to 0, such as the preset range is 0 to 30 degrees Celsius, indicating that when the difference between the target temperature and the current temperature of the battery pack is between 0 and 30 degrees Celsius, the control circuit controls the heating element to heat the battery pack, that is, only when the target temperature is greater than or equal to the current temperature of the battery pack, the control circuit controls the heating element to heat the battery pack; the lower limit value of the preset range may be less than 0, such as the preset range is -2 to 30 degrees Celsius, indicating that when the difference between the target temperature and the current temperature of the battery pack is between 5 and 30 degrees Celsius, the control circuit controls the heating element to heat the battery pack, that is, when the target temperature is less than or equal to or greater than the current temperature of the battery pack, the control circuit controls the heating element to heat the battery pack. In order to avoid ineffective heating of the heating element, the lower limit of the preset range can be set to be greater than -10 degrees Celsius, such as -5 degrees Celsius. Similarly, the upper limit of the preset range can be set as needed. For example, if the ambient temperature of the working scene of the energy storage cabinet is -40 degrees Celsius, and the lower limit threshold of the fast charging temperature is 20 degrees Celsius, in order to meet the fast charging of the battery pack, the upper limit of the preset range can be appropriately increased, such as 90 degrees Celsius. That is, the upper limit of the preset range can be set according to the ambient temperature.

[0085] In summary, in the method provided in the above embodiment, before heating the battery pack, it is determined whether the ratio of the target temperature and the current temperature of the battery pack is within a preset range. Only within the preset range is the battery pack heated, so as to avoid the battery pack temperature obtained in other charging states being lower than the battery pack temperature obtained at the beginning of heating, causing the heating strategy of the heating element of the battery pack to deviate, thereby improving the heating accuracy, and avoiding unnecessary heating of the battery pack, which may cause the battery pack temperature to be too high and affect the service life of the battery pack.

[0086] In a possible implementation, controlling the heating element to heat the battery pack based on the target temperature includes:

[0087] Step 302: During the process of heating the battery pack, obtaining a first current battery temperature;

[0088] Specifically, the first current battery temperature represents the temperature of the battery pack detected by the temperature sensor during the process of the heating element heating the battery pack.

[0089] Step 304: In response to the first current battery temperature being greater than or equal to the target temperature, controlling the heating element to stop heating.

[0090] Specifically, in response to the first current battery temperature being greater than or equal to the target temperature, the heating element is controlled to stop heating. It can be understood that heating is stopped when the first current battery temperature is greater than or equal to the target temperature.

[0091] In a specific real-time process, when the first current battery temperature is greater than or equal to the target temperature, a stop heating instruction may be triggered, and the control circuit may respond to the stop heating instruction by shutting down the power supply circuit of the heating element to control the heating element to stop heating the battery pack. The stop heating instruction is used to control the circuit to shut down the power supply circuit of the heating element.

[0092] Specifically, during the process of heating the battery pack, the temperature sensor can detect the temperature of the battery pack in real time, and transmit the first current battery temperature to the control circuit, and the control circuit can determine the magnitude of the first current battery temperature and the target temperature in real time, and when the first current battery temperature is greater than or equal to the target temperature, the control circuit can control the heating element to stop heating. In which, real time can be understood as checking the temperature of the battery pack at a preset time interval, such as 3 seconds or 3 milliseconds.

[0093] In summary, in the method provided in the above embodiment, during the battery pack processing, the temperature of the battery pack can be detected in real time by a temperature sensor. When the temperature of the battery pack is greater than or equal to the target temperature, heating is stopped to avoid overheating the battery pack, thereby ensuring the safety of the battery pack.

[0094] In a possible implementation, the method further includes:

[0095] Step 402: After stopping heating the battery pack, obtain a second current battery temperature.

[0096] Specifically, the second current battery temperature represents the temperature of the battery pack detected by the temperature sensor during the period from when heating is stopped to when the charging interface is disconnected from the mains.

[0097] Step 404 : In response to the second current battery temperature being less than the target temperature, controlling the heating element to heat the battery pack based on the target temperature.

[0098] Specifically, in response to the second current battery temperature being lower than the target temperature, it can be understood as: when the second current battery temperature is lower than the target temperature.

[0099] In a specific real-time process, when the second current battery temperature is less than the target temperature, a continuing heating instruction may be triggered, and the control circuit may respond to the continuing heating instruction and turn on the power supply circuit of the heating element again to control the heating element to heat the battery pack. The continuing heating instruction is used to control the circuit to turn on the power supply circuit of the heating element.

[0100] For example, after heating is stopped until the charging port is disconnected from the mains, the temperature sensor can detect the temperature of the battery pack in real time and transmit the first current battery temperature to the control circuit. The control circuit can determine the size of the second current battery temperature and the target temperature in real time. When the second current battery temperature is lower than the target temperature, the control circuit can control the heating element to start heating so that the temperature of the battery pack is maintained at approximately the target temperature.

[0101] In summary, in the method provided in the above embodiment, during the period from when the heating element stops heating to when the charging port is disconnected from the mains, the temperature of the battery pack can be detected in real time by the temperature sensor. When the temperature of the battery pack is lower than the target temperature, heating is turned on to ensure that the temperature of the battery pack is roughly constant at the target temperature, thereby avoiding the operator being unable to use the fast charging function when the battery pack temperature drops, thereby improving the user experience.

[0102] In a possible implementation, the method further includes:

[0103] Step 502: before starting to charge the battery pack, obtaining a third current battery temperature;

[0104] Specifically, the third current battery temperature represents the temperature of the battery pack detected by the temperature sensor before charging starts. It is understandable that before charging starts may be the stage after the battery pack is connected to the mains through the charging interface to before charging starts.

[0105] Step 504: In response to the third current battery temperature being less than the first charging temperature threshold, controlling the heating element to heat the battery pack.

[0106] Specifically, in response to the third current battery temperature being less than the first charging temperature threshold, controlling the heating element to heat the battery pack can be understood as: determining whether the third current battery temperature is less than the first charging temperature threshold; when the third current battery temperature is less than the first charging temperature threshold, controlling the heating element to heat the battery pack.

[0107] In a specific real-time process, a third self-heating instruction may be triggered when the current battery temperature is less than the first charging temperature threshold, and the control circuit may respond to the self-heating instruction and turn on the power supply circuit of the heating element to control the heating element to heat the battery pack. The self-heating instruction is used to control the circuit to turn on the power supply circuit of the heating element.

[0108] Specifically, the first charging temperature threshold refers to the lowest temperature at which the battery pack is allowed to charge. It is understandable that charging when the ambient temperature is too low is very unfavorable to the battery. To avoid charging when the battery pack temperature is too low, the control circuit will store the first charging temperature threshold to protect the battery pack from charging in low temperature scenarios. The first charging temperature threshold can be set as needed. For example, the first charging temperature threshold is 2 degrees Celsius.

[0109] Specifically, when the third current battery temperature is less than the first charging temperature threshold, it indicates that the battery pack is not allowed to be charged. At this time, the control circuit can control the heating element to heat the battery pack. It can be understood that in this embodiment, the heating element is connected to the mains through the charging interface, that is, the heating element uses the mains to heat the battery pack.

[0110] Step 506: In response to heating to a second charging temperature threshold, controlling the heating element to stop heating and charging the battery pack.

[0111] Specifically, in response to heating to the second charging temperature threshold, controlling the heating element to stop heating and charging the battery pack can be understood as: when heating to the second charging temperature threshold, stopping heating and charging the battery pack.

[0112] The second charging threshold is greater than the first charging threshold.

[0113] In a specific real-time process, when the battery is heated to the second charging temperature threshold, a stop self-heating instruction may be triggered, and the control circuit may respond to the stop self-heating instruction and turn off the power supply circuit of the heating element to control the heating element to stop heating the battery pack. The stop self-heating instruction is used to control the circuit to turn off the power supply circuit of the heating element.

[0114] Specifically, the second charging temperature threshold refers to a temperature value that allows the battery pack to charge normally, and the second charging temperature threshold can be set as needed. For example, the second charging temperature threshold is 7 degrees Celsius.

[0115] For example, after the charging interface of the energy storage cabinet is connected to the mains, the control circuit obtains through the temperature sensor that the third current battery temperature of the battery pack is 0 degrees Celsius, and the third current battery temperature (0 degrees Celsius) is less than the first charging temperature threshold (2 degrees Celsius). Charging the battery pack at the third current battery temperature (0 degrees Celsius) will cause damage to the battery pack. Therefore, the control circuit controls to open the power circuit between the heating element and the mains, and disconnects the charging circuit connecting the battery pack and the mains, and heats the battery pack through the heating element. When the temperature sensor obtains that the third current battery temperature of the battery pack is equal to the second charging temperature threshold (7 degrees Celsius), the power circuit between the heating element and the mains is disconnected, and the charging circuit connected to the battery pack and the mains is opened, so as to heat the battery pack whose current temperature is the second charging temperature threshold (7 degrees Celsius).

[0116] In summary, in the method provided in the above embodiment, before charging the battery pack, it is determined whether the temperature of the battery pack is too low. When the temperature of the battery pack is too low, the battery pack is heated by a heating element. After being heated to a second charging temperature threshold, the battery pack is charged to avoid damage to the battery cells in the battery pack, thereby increasing the service life of the battery pack.

[0117] In a possible implementation, the method further includes:

[0118] Step 602: before the battery pack charges the external battery pack, obtaining a fourth current battery temperature;

[0119] Specifically, the fourth current battery temperature refers to the temperature of the battery pack after the battery pack is connected to the battery pack and before the battery pack is charged. The fourth current battery temperature is used to determine whether the battery pack can quickly charge the battery pack.

[0120] Step 604: In response to the fourth current battery temperature being greater than or equal to the fast charge temperature lower limit threshold, entering a fast charge mode so that the battery pack quickly charges the battery pack with a first current.

[0121] Specifically, in response to the fourth current battery temperature being greater than or equal to the lower limit threshold of the fast charging temperature, the fast charging mode is entered so that the battery pack quickly charges the battery pack with the first current. It can be understood that: when the fourth current battery temperature is greater than or equal to the lower limit threshold of the fast charging temperature, the fast charging mode is entered so that the battery pack quickly charges the battery pack with the first current.

[0122] In a specific real-time process, the fourth fast charge instruction can be triggered when the current battery temperature is greater than or equal to the lower limit threshold of the fast charge temperature, and the control circuit can respond to the fast charge instruction to open the first discharge circuit and close the second discharge circuit to quickly charge the connected battery pack. The fast charge instruction is used to control the circuit to open the first discharge circuit and close the second discharge circuit.

[0123] Step 606: In response to the fourth current battery temperature being less than the fast charge temperature lower limit threshold, entering a slow charge mode so that the battery pack slowly charges the battery pack with a second current.

[0124] Specifically, in response to the fourth current battery temperature being less than the lower limit threshold of the fast charging temperature, the slow charging mode is entered so that the battery pack slowly charges the battery pack with the second current. It can be understood that when the fourth current battery temperature is less than the lower limit threshold of the fast charging temperature, the slow charging mode is entered so that the battery pack slowly charges the battery pack with the second current.

[0125] In a specific real-time process, a slow charge instruction can be triggered when the fourth current battery temperature is less than the lower limit threshold of the fast charge temperature. The control circuit can respond to the slow charge instruction, open the second discharge circuit and close the first discharge circuit at the same time to quickly charge the connected battery pack. It is understandable that the charging power or charging current of the slow charge mode and the fast charge mode are different. The charging power or charging current of the fast charge mode is greater than the charging power or charging current of the slow charge mode.

[0126] Specifically, a first discharge circuit and a second discharge circuit may be provided between the battery pack and the battery pack, and the first discharge circuit and the second discharge circuit may be switched by a switch or the like. The first current may be understood as the current generated when the battery pack is connected to the battery pack through the first discharge circuit and is charged. The second current may be understood as the current generated when the battery pack is connected to the battery pack through the second discharge circuit and is charged. The first current is greater than the second current. It is understandable that the fast charge mode is when the battery pack is connected to the battery pack through the first discharge circuit, and the slow charge mode is when the battery pack is connected to the battery pack through the second discharge circuit.

[0127] In summary, in the method provided in the above embodiment, before the battery pack charges the battery pack, it is determined whether the temperature of the battery pack is less than the lower limit threshold of the fast charge temperature, and the slow charge mode is entered when the temperature of the battery pack is less than the lower limit threshold of the fast charge temperature; the fast charge mode is entered when the temperature of the battery pack is greater than or equal to the lower limit threshold of the fast charge temperature. By setting two charging modes, the applicability of the energy storage cabinet is improved.

[0128] In a possible implementation, the method further includes:

[0129] Step 702: receiving a fifth current battery temperature acquired by a temperature sensor during a process in which the battery pack performs fast charging on an external battery pack;

[0130] Specifically, the fifth current battery temperature represents the battery pack temperature detected by the temperature sensor when the battery pack is fast charging an external battery pack.

[0131] Step 704: when the fifth current battery temperature is less than the lower limit threshold of the fast charge temperature, enter the slow charge mode, and control the heating element to heat the battery pack until the received sixth current battery temperature is greater than or equal to the lower limit threshold of the fast charge temperature, then enter the fast charge mode;

[0132] The sixth current battery temperature is obtained by a temperature sensor during the process of the battery pack slowly charging an external battery pack.

[0133] Specifically, the heating element can be connected to the battery pack so that the heating element can use the power of the battery pack, and the control circuit can control the connection or disconnection of the heating element and the battery pack. In the scenario where the battery pack charges the battery pack, when the temperature of the battery pack is lower than the lower limit threshold of the fast charge temperature, the control circuit can connect the heating element and the battery pack to heat the battery pack. At the same time, the battery pack can charge the battery pack slowly, and enter the fast charge mode when the temperature of the battery pack rises above the lower limit threshold of the fast charge temperature.

[0134] In summary, in the method provided in the above embodiment, during the fast charging process, when the battery pack cannot be quickly charged due to the low temperature, the heater can be used to heat the battery pack while entering the slow charging mode to charge the battery pack. After the temperature of the battery pack rises, the fast charging mode can be entered again to improve the charging efficiency of the battery pack, reduce the charging time, and enhance user favorability.

[0135] In a possible implementation, controlling the heating element to heat the battery pack based on the target temperature includes:

[0136] Step 802: Obtain the starting working time;

[0137] Specifically, the starting working time refers to the time when the energy storage cabinet starts working after charging is completed. The starting working time can be input by the operator before charging, or it can be pre-stored in the control circuit by the operator, such as a time selection area for the operator to input is provided on the outer wall of the energy storage cabinet, and the operator can input the starting working time in the time selection area before charging, or the operator can input the starting working time in the time selection area when using the energy storage cabinet for the first time; it can also be generated by the control circuit based on the operator's usage habits, such as generated by using a convolutional neural network based on the operator's historical use of the energy storage cabinet.

[0138] Step 804: Determine the heating time based on the current temperature and target temperature of the battery pack;

[0139] Specifically, the heating time refers to the working time of the heater continuously heating the battery pack after charging is completed. The heating time can be determined based on the current temperature of the battery pack, the target temperature and the rated power of the heating element. The heating time can be calculated based on the current temperature, target temperature and rated power of the battery pack. The calculation method is not specifically limited in this specification. For example, if the current temperature of the battery pack is 20 degrees Celsius, the target temperature is 50 degrees Celsius, and the rated power of the heating element is 20KW / h, it is calculated that it takes 1 hour to heat the battery pack from 20 degrees Celsius to 50 degrees Celsius using a heating element with a rated power of 20KW / h.

[0140] Step 806: Determine the start time of the heating element based on the heating time and the start working time;

[0141] Step 808: In response to the start heating instruction triggered by reaching the start time, heating the battery pack.

[0142] Specifically, in response to reaching the start time, it can be understood as: when reaching the start time.

[0143] In a specific real-time process, reaching the start time may trigger a heating start instruction, and the control circuit may start the power supply circuit of the heating element in response to the heating start instruction to heat the battery pack.

[0144] Specifically, the start time refers to the time when the heating element starts working. The start time can be calculated based on the heating time and the starting working time. For example, if the charging completion time is 4 a.m., the heating time is 1 hour, and the starting working time is 8 a.m., in order to avoid heat loss after the heating element is heated to the target temperature, the heating element can start heating the battery pack at 7 a.m.

[0145] In summary, in the method provided in the above embodiment, after charging is completed, the heating time is determined based on the current temperature and target temperature of the battery pack, and the turn-on time of the heating element is determined based on the heating time and the starting working time. When the turn-on time is reached, the battery pack is heated to avoid the temperature drop of the battery pack after the heating element heats the battery pack to the target temperature, and to reduce the power loss of continuous heating of the battery pack by the heating element to ensure the temperature of the battery pack, thereby saving electric energy and increasing the service life of the heating element.

[0146] In a possible implementation, controlling the heating element to heat the battery pack based on the target temperature includes:

[0147] Step 902: Obtain working time and outdoor ambient temperature;

[0148] Specifically, the working time refers to the time from when the charging interface of the energy storage cabinet is disconnected from the mains to when all the power of the battery pack is consumed, or refers to the time from when the charging interface of the energy storage cabinet is disconnected from the mains to when the charging interface of the energy storage cabinet is connected to the mains. The working time is used to characterize the usage time of the energy storage cabinet. The working time is obtained in the same way as the above-mentioned starting working time, so it will not be repeated.

[0149] Specifically, the use scenario of the energy storage cabinet in this application is often an outdoor scenario, and the outdoor ambient temperature refers to the outdoor temperature where the energy storage cabinet is located. The outdoor ambient temperature can be input by the operator before charging, or it can be obtained by the control circuit through the network. The specific method of obtaining the outdoor ambient temperature is not specifically limited in this specification. The outdoor ambient temperature is used to characterize the degree of temperature attenuation of the battery pack, that is, the lower the outdoor ambient temperature, the more serious the temperature attenuation of the battery pack. It can be understood that the outdoor ambient temperature can be the lowest temperature during the period of working time. For example, if the working time is from 8 am to 11 am, the outdoor ambient temperature can be the lowest temperature from 8 am to 11 am; the outdoor ambient temperature can also be the lowest temperature on the date of working time. For example, if the working time is from 8 am on M month N day to 11 am on January 1, the outdoor ambient temperature can be the lowest temperature on M month N day.

[0150] Step 904: Correct the target temperature according to the working time and the outdoor ambient temperature to obtain the current target temperature;

[0151] Specifically, the current target temperature is the target temperature after the target temperature is corrected or adjusted. Correction may refer to modifying the target temperature.

[0152] For example, when the target temperature is 45 degrees Celsius, the working time is 4 hours, and the outdoor ambient temperature is -20 degrees Celsius, the control circuit determines that heating the battery pack to 45 degrees Celsius cannot meet the requirements of the energy storage cabinet working continuously for 4 hours at -20 degrees Celsius. The control circuit can modify 45 degrees Celsius (the target temperature) to 50 degrees Celsius (the current target temperature).

[0153] Step 906: Control the heating element to heat the battery pack based on the current target temperature.

[0154] Specifically, “controlling the heating element to heat the battery pack based on the current target temperature” has the same technical effect as the above-mentioned “controlling the heating element to heat the battery pack based on the target temperature” and will not be repeated.

[0155] In summary, in the method provided in the above embodiment, the target temperature is corrected according to the working time and the outdoor ambient temperature, so that when the energy storage cabinet works continuously under the outdoor ambient temperature scenario, it can still meet the fast charging of the battery pack, thereby improving user favorability and user experience.

[0156] The embodiment of the present disclosure also provides an energy storage cabinet, which includes: a battery pack; a heating element; a control circuit connected to the battery pack and the heating element; Figure 4 As shown, the control circuit may include: a target temperature acquisition module, configured to acquire a target temperature, the target temperature being greater than a fast charge temperature lower limit threshold, the fast charge temperature lower limit threshold being the lowest temperature at which the battery pack can fast charge an external battery pack, and the fast charge rate being greater than or equal to 2C; a heating module, the heating module being configured to detect a charging status of the battery pack, and after the battery pack is charged, controlling the heating element to heat the battery pack based on the target temperature.

[0157] Based on the same inventive concept as the above-mentioned embodiment, this embodiment further provides a computer storage medium, in which a computer program is stored. The computer storage medium may be a ferromagnetic random access memory (FRAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM) or the like; it may also be various devices including one or any combination of the above-mentioned memories, such as a mobile phone, a computer, a tablet device, a personal digital assistant, etc. When the computer program stored in the computer storage medium is executed by the processor, the energy storage cabinet heating method applied to the above-mentioned control electronics is implemented. For the specific steps implemented when the computer program is executed by the processor, please refer to Figure 1 The description of the illustrated embodiment will not be repeated here.

[0158] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0159] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0160] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for heating an energy storage cabinet, characterized in that: The energy storage cabinet comprises: Battery pack; A heating element, connected to the mains, for heating the battery pack using the mains; A control circuit connected to the battery pack and the heating element; The method is applied to the control circuit, and the method comprises: Obtaining a target temperature, where the target temperature is greater than a fast charge temperature lower limit threshold, where the fast charge temperature lower limit threshold is a minimum temperature at which the battery pack can fast charge an external battery pack; The charging state of the battery pack is detected, and after the battery pack is fully charged, the heating element is controlled based on the target temperature to heat the battery pack.

2. The method according to claim 1, characterized in that The step of controlling the heating element to heat the battery pack based on the target temperature includes: Obtaining the current temperature of the battery pack; In response to a difference between the target temperature and the current temperature being within the preset range, the heating element is controlled to heat the battery pack.

3. The method according to claim 2, characterized in that The controlling the heating element to heat the battery pack includes: In the process of heating the battery pack, obtaining a first current battery temperature; In response to the first current battery temperature being greater than or equal to the target temperature, the heating element is controlled to stop heating.

4. The method according to claim 3, characterized in that The method further comprises: After stopping heating the battery pack, obtaining a second current battery temperature; In response to the second current battery temperature being less than the target temperature, the heating element is controlled to heat the battery pack based on the target temperature.

5. The method according to claim 2, characterized in that The method further comprises: Before starting to charge the battery pack, obtaining a third current battery temperature; In response to the third current battery temperature being less than a first charging temperature threshold, controlling the heating element to heat the battery pack; In response to heating to a second charging temperature threshold, controlling the heating element to stop heating and charging the battery pack; The second charging threshold is greater than the first charging threshold.

6. The method according to claim 2, characterized in that The method further comprises: Before the battery pack charges the external battery pack, obtaining a fourth current battery temperature; In response to the fourth current battery temperature being greater than or equal to a fast charge temperature lower limit threshold, entering a fast charge mode so that the battery pack quickly charges the battery pack with a first current; In response to the fourth current battery temperature being less than the fast-charging temperature lower limit threshold, a slow-charging mode is entered so that the battery pack is slowly charged with a second current.

7. The method according to claim 1 or 2, characterized in that: The step of controlling the heating element to heat the battery pack based on the target temperature includes: Get the start working time; determining a heating time based on a current temperature of the battery pack and the target temperature; Determining a start time of the heating element based on the heating duration and the start working time; In response to reaching the start-up time, the battery pack is heated.

8. The method according to claim 1 or 2, characterized in that: The step of controlling the heating element to heat the battery pack based on the target temperature includes: Get working hours and outdoor ambient temperature; Correcting the target temperature according to the working time and the outdoor ambient temperature to obtain a current target temperature; The heating element is controlled to heat the battery pack based on the current target temperature.

9. An energy storage cabinet, characterized in that: The energy storage cabinet comprises: Battery pack; A heating element, connected to the mains, for heating the battery pack using the mains; A control circuit connected to the battery pack and the heating element; The control circuit comprises: a target temperature acquisition module, configured to acquire a target temperature, the target temperature being greater than a fast charge temperature lower limit threshold, the fast charge temperature lower limit threshold being a minimum temperature at which the battery pack can fast charge an external battery pack, and the fast charge rate being greater than or equal to 2C; The heating module is configured to detect the charging state of the battery pack, and after the battery pack is fully charged, control the heating element to heat the battery pack based on the target temperature.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which is loaded and executed by a processor to implement the energy storage cabinet heating method according to any one of claims 1 to 8.

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