Energy storage liquid cooling device control method and device, energy storage liquid cooling device and storage medium

Abstract

The present application relates to a control method and device for an energy storage liquid cooling device, an energy storage liquid cooling device, and a storage medium, wherein the method includes: obtaining the current condensing pressure of the energy storage liquid cooling device when it is detected that the temperature of the energy storage battery in the energy storage liquid cooling device exceeds a preset temperature; obtaining a comparison result between the current condensing pressure and the condensing pressure frequency limit value; and according to the comparison result, controlling the operating frequency of the compressor and condensing fan in the energy storage liquid cooling device and / or adjusting the condensing pressure frequency limit value to reduce the temperature of the energy storage battery. This application solves the problem in the prior art of low thermal management efficiency caused by limiting the operation of the compressor and water pump after thermal runaway occurs in the energy storage liquid cooling device.

Description

Technical Field

[0001] The present application relates to the field of energy storage liquid cooling equipment, and in particular to a control method and device for energy storage liquid cooling equipment, energy storage liquid cooling equipment, and storage medium. Background Art

[0002] Energy storage batteries are devices used to store electrical energy. They can release stored energy when power is insufficient to balance supply and demand. They can also store energy when power is in excess and release it during peak hours to reduce reliance on the power grid. Energy storage batteries generate heat when charging and discharging. Energy storage liquid cooling equipment supplies cold water to the cooling plates of the energy storage battery pack to cool the heat generated by the batteries. Furthermore, when the internal temperature of the battery exceeds a certain threshold, it may trigger a series of chain reactions, causing the temperature to rise further, resulting in the so-called "thermal runaway." Thermal runaway is an extreme case of battery heating that can cause the battery to catch fire or explode.

[0003] To address the problem of battery thermal runaway, in order to ensure the reliable operation of energy storage liquid cooling equipment, the current method used is to reduce the operating rate of the compressor and water pump. This method has low thermal management efficiency for energy storage liquid cooling equipment. Summary of the Invention

[0004] The present application provides a control method and device for an energy storage liquid cooling device, an energy storage liquid cooling device, and a storage medium to solve the problem in the prior art of low thermal management efficiency caused by limiting the operation of a compressor and a water pump after thermal runaway occurs in the energy storage liquid cooling device.

[0005] In a first aspect, the present application provides a control method for an energy storage liquid cooling device, comprising: obtaining a current condensing pressure of the energy storage liquid cooling device when it is detected that the temperature of an energy storage battery in the energy storage liquid cooling device exceeds a preset temperature; obtaining a comparison result between the current condensing pressure and a condensing pressure frequency limit value; and according to the comparison result, controlling the operating frequency of a compressor and a condensing fan in the energy storage liquid cooling device and / or adjusting the condensing pressure frequency limit value to reduce the temperature of the energy storage battery.

[0006] Optionally, based on the comparison result, the operating frequency of the compressor and the condensing fan in the energy storage liquid cooling device is controlled and / or the condensing pressure frequency limit value is adjusted to reduce the temperature of the energy storage battery, including: when the current condensing pressure is less than the condensing pressure frequency limit value, controlling the compressor to operate at the maximum frequency and controlling the condensing fan to operate at the maximum frequency to reduce the temperature of the energy storage battery.

[0007] Optionally, based on the comparison result, the operating frequencies of the compressor and the condensing fan in the energy storage liquid cooling device are controlled and / or the condensing pressure frequency limit value is adjusted to reduce the temperature of the energy storage battery, including: when the current condensing pressure is between a first preset threshold value of the condensing pressure frequency limit value and a first preset threshold value of the condensing pressure frequency limit value, controlling the condensing fan to operate at the maximum frequency; and reducing the temperature of the energy storage battery by sequentially increasing the condensing pressure frequency limit value and sequentially increasing the operating frequency of the compressor.

[0008] Optionally, the temperature of the energy storage battery is lowered by sequentially increasing the condensing pressure frequency limit value and sequentially increasing the operating frequency of the compressor, including: increasing the operating frequency of the compressor each time the condensing pressure frequency limit value is increased; after each increase, determining the difference between the current return temperature of the energy storage battery coolant and the return temperature of the energy storage battery coolant a preset time ago, and the heating rate of the energy storage battery; if the difference between the current return temperature of the energy storage battery coolant and the return temperature of the energy storage battery coolant a preset time ago is greater than 0, and the heating rate of the energy storage battery is greater than a second preset threshold, increasing the condensing pressure frequency limit value again on the basis of the previous increase, and increasing the operating frequency of the compressor again, so as to lower the temperature of the energy storage battery.

[0009] Optionally, the method further includes: stopping increasing the condensing pressure frequency limit value and stopping increasing the operating frequency of the compressor when one of the following conditions is met: the operating frequency of the compressor is increased to the maximum operating frequency; the condensing pressure frequency limit value is increased to the maximum condensing pressure value; the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature a preset time ago is less than or equal to 0; the heating rate of the energy storage battery is less than the second preset threshold.

[0010] Optionally, after controlling the compressor to operate at a maximum frequency and controlling the condensing fan to operate at a maximum frequency, the method further includes: determining a difference between a current return temperature of the energy storage battery coolant and a return temperature of the energy storage battery coolant a preset time ago, and a heating rate of the energy storage battery; if the difference between the current return temperature of the energy storage battery coolant and the return temperature of the energy storage battery coolant a preset time ago is greater than 0, and the heating rate of the energy storage battery is greater than a second preset threshold, determining that the energy storage liquid cooling device is in a thermal runaway state.

[0011] In a second aspect, the present application provides a control device for an energy storage liquid cooling device, comprising: a first acquisition module, for acquiring the current condensing pressure of the energy storage liquid cooling device when it is detected that the temperature of the energy storage battery in the energy storage liquid cooling device exceeds a preset temperature; a second acquisition module, for acquiring a comparison result between the current condensing pressure and a condensing pressure frequency limit value; and a control module, for controlling the operating frequency of the compressor and the condensing fan in the energy storage liquid cooling device and / or adjusting the condensing pressure frequency limit value according to the comparison result, so as to reduce the temperature of the energy storage battery.

[0012] In a third aspect, the present application provides an energy storage liquid cooling device, comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the processor is configured to execute the control method of the energy storage liquid cooling device described in the first aspect of the present application.

[0013] In a fourth aspect, the present application further provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the control method of the energy storage liquid cooling device described in the first aspect of the present application.

[0014] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: the method provided by the embodiment of the present application, when detecting that the temperature of the energy storage battery in the energy storage liquid cooling device exceeds the preset temperature, obtains the comparison result between the current condensing pressure and the condensing pressure frequency limit value, and then controls the operating frequency of the compressor and condensing fan in the energy storage liquid cooling device and / or adjusts the condensing pressure frequency limit value based on the comparison result to reduce the temperature of the energy storage battery. That is, in the present application, when the energy storage battery reaches a high temperature, corresponding measures can be taken to prevent the energy storage battery from continuing to heat up. The purpose of controlling the operating frequency of the compressor and condensing fan and adjusting the condensing pressure frequency limit value is to reduce the temperature. Therefore, it can be adjusted upward or downward according to actual needs, and it is not just limited to operation, but is controlled accordingly according to actual needs. Therefore, through the above method of the present application, the abnormal increase in battery temperature is effectively suppressed, and the thermal management efficiency of the energy storage liquid cooling device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 This is one of the structural schematic diagrams of an energy storage liquid cooling device provided in an embodiment of the present application;

[0019] Figure 2 A flow chart of a control method for an energy storage liquid cooling device provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the structure of a control device for an energy storage liquid cooling device provided in an embodiment of the present application;

[0021] Figure 4 This is one of the structural schematic diagrams of the energy storage liquid cooling device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0023] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0024] like Figure 1 As shown, the existing energy storage liquid cooling equipment is mainly composed of a compressor, a condensing fan, a condenser, an evaporator, an electronic expansion valve, a water pump, an electric control box, etc.

[0025] Here’s how it works:

[0026] Compressor: The compressor compresses the refrigerant into high-temperature and high-pressure gas, providing power for the circulation of the refrigerant.

[0027] Condenser: Compressed, high-temperature, high-pressure refrigerant gas enters the condenser and is cooled into a low-temperature, high-pressure liquid through heat exchange with the outside air. The fan accelerates air flow during this process, improving the condenser's heat dissipation efficiency.

[0028] Electronic expansion valve: The refrigerant liquid passes through the electronic expansion valve, which automatically adjusts the opening according to system requirements, controls the flow of refrigerant, and thus adjusts the cooling capacity of the system.

[0029] Plate Evaporator: After passing through the electronic expansion valve, the refrigerant enters the plate evaporator. In the evaporator, the refrigerant absorbs heat from the coolant and evaporates into a low-temperature, low-pressure gas. Simultaneously, the coolant is pumped out to the battery pack cooling plate, absorbing the heat generated by the charging and discharging of the energy storage batteries.

[0030] Causes of thermal runaway: In addition to unpredictable causes such as internal battery short circuits, external impacts, and aging, the causes of thermal failure predictive control that can be achieved are as follows:

[0031] 1) Overcharging and overdischarging: Chemical reactions occur during the battery charging and discharging process, which also generate heat. Overcharging or overdischarging can cause an imbalance in the chemical composition within the battery, triggering additional chemical reactions and generating more heat. This can cause the battery's internal temperature to rise sharply, or even trigger thermal runaway.

[0032] 2) Excessive ambient temperature: The ambient temperature around the battery also affects the battery's heating. In a high temperature environment, the chemical reaction rate inside the battery is accelerated, and the heat generated will also increase.

[0033] In order to solve the problem in the prior art that the thermal management efficiency is low due to the limited operation of the compressor and the water pump after the energy storage liquid cooling device produces thermal runaway, the present application provides a control method for the energy storage liquid cooling device, such as Figure 2 As shown, the steps of the method include:

[0034] Step 201: When it is detected that the temperature of the energy storage battery in the energy storage liquid cooling device exceeds a preset temperature, the current condensing pressure of the energy storage liquid cooling device is obtained;

[0035] In a specific example, the preset temperature can be set to 45°C, 50°C, etc. This setting can be made based on the actual needs of the energy storage battery in the current energy storage liquid cooling device. Condensation pressure refers to the pressure level at which the refrigerant vapor is cooled and converted to liquid in the condenser during the refrigeration cycle of the energy storage liquid cooling device. When high-temperature, high-pressure refrigerant vapor enters the condenser, it releases heat to the surrounding cooling medium (such as air or water), causing the refrigerant vapor to cool and eventually condense into a liquid. The pressure at which the refrigerant is exposed during this process is the condensation pressure.

[0036] Step 202: Obtain a comparison result between the current condensing pressure and the condensing pressure frequency limit value;

[0037] The condensing pressure frequency limit is related to the refrigerant in the energy storage liquid cooling system. For example, if the maximum condensing pressure of R410A refrigerant is 4.6 MPa, the corresponding condensing pressure frequency limit can be set to 3.5 MPa or 4 MPa, meaning that the condensing pressure frequency limit is lower than the refrigerant's maximum condensing pressure. In general, during normal operation of the energy storage liquid cooling system, the current condensing pressure is lower than the condensing pressure frequency limit.

[0038] Step 203: Based on the comparison result, the operating frequencies of the compressor and the condensing fan in the energy storage liquid cooling device are controlled and / or the condensing pressure frequency limit value is adjusted to reduce the temperature of the energy storage battery.

[0039] It can be seen that in the present application, through the above steps 201 to 203, when it is detected that the temperature of the energy storage battery in the energy storage liquid cooling device exceeds the preset temperature, the comparison result between the current condensing pressure and the condensing pressure frequency limit value is obtained, and then based on the comparison result, the operating frequency of the compressor and the condensing fan in the energy storage liquid cooling device is controlled and / or the condensing pressure frequency limit value is adjusted to reduce the temperature of the energy storage battery. That is, in the present application, when the energy storage battery reaches a high temperature, corresponding measures can be taken to prevent the energy storage battery from continuing to heat up. The purpose of controlling the operating frequency of the compressor and the condensing fan, and adjusting the condensing pressure frequency limit value is to reduce the temperature. Therefore, it can be adjusted upward or downward according to actual needs. It is not just a limited operation, but a corresponding control according to actual needs. Therefore, through the above method of the present application, the abnormal increase of the battery temperature is effectively suppressed, and the thermal management efficiency of the energy storage liquid cooling device is improved.

[0040] In this embodiment of the present application, if the current condensing pressure does not exceed the condensing pressure frequency limit, it indicates that there is no pressure protection risk at this time, and the compressor and condensing fan can directly operate at the maximum frequency to effectively reduce the temperature of the energy storage battery. Therefore, the method involved in the above step 203 of controlling the operating frequency of the compressor and condensing fan in the energy storage liquid cooling device and / or adjusting the condensing pressure frequency limit based on the comparison result to reduce the temperature of the energy storage battery can further include:

[0041] Step 11: When the current condensing pressure is less than the condensing pressure frequency limit value, control the compressor to operate at the maximum frequency and control the condensing fan to operate at the maximum frequency to reduce the temperature of the energy storage battery.

[0042] It can be seen that in the case of step 11 above, the energy storage liquid cooling device can enter the maximum load mode to reduce the temperature of the energy storage battery as quickly as possible without affecting the normal operation of the energy storage liquid cooling device. In addition, it should be noted that when the current condensing pressure is less than the condensing pressure frequency limit value, regardless of whether the current environment is a high temperature environment, such as an ambient temperature greater than 40°C, or a normal temperature environment, such as an ambient temperature less than 40°C, when the energy storage battery exceeds the preset temperature, the frequency of the compressor and condensing fan can be operated at the maximum frequency.

[0043] In addition, in this case, the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature a preset time ago, as well as the energy storage battery temperature rise rate, can be further determined. If the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature a preset time ago is greater than 0, and the energy storage battery temperature rise rate is greater than a second preset threshold, the energy storage liquid cooling device is determined to be in a thermal runaway state. In other words, if the energy storage liquid cooling device is still unable to effectively reduce the temperature of the energy storage battery after operating at maximum load, it indicates that the energy storage battery of the energy storage liquid cooling device is in a thermal runaway state. At this time, this status can be reported to inform the public of the current hidden dangers.

[0044] If the current condensing pressure is close to the condensing pressure frequency limit value or even exceeds the condensing pressure frequency limit value by a certain amount, it indicates that the compressor cannot operate at the maximum frequency at this time, and the cooling effect on the energy storage battery is not obvious. Therefore, the condensing pressure frequency limit value can be appropriately adjusted upward, such as by 0.2MPa. After the condensing pressure frequency limit value is adjusted upward, the corresponding operating frequency of the compressor can also be adjusted upward. Therefore, the method involved in the above step 203 of controlling the operating frequency of the compressor and condensing fan in the energy storage liquid cooling device and / or adjusting the condensing pressure frequency limit value based on the comparison result to reduce the temperature of the energy storage battery can further include:

[0045] Step 21: When the current condensing pressure is between a condensing pressure frequency limit value and a first preset threshold value, controlling the condensing fan to operate at a maximum frequency;

[0046] Step 22 : Lowering the temperature of the energy storage battery by sequentially increasing the condensing pressure frequency limit value and sequentially increasing the operating frequency of the compressor.

[0047] In a specific example, the first preset threshold value can be 0.1 MPa or other corresponding settings based on actual needs. By successively increasing the condensing pressure frequency limit value, the operating frequency of the compressor can be successively increased. In other words, the condensing pressure is related to the operating frequency of the compressor. The larger the condensing pressure frequency limit value, the higher the corresponding compressor operating frequency. Therefore, in this case, by appropriately increasing the condensing pressure frequency limit value and thereby increasing the operating frequency of the compressor, the energy storage battery can be quickly cooled.

[0048] Furthermore, the method of reducing the temperature of the energy storage battery by sequentially increasing the condensing pressure frequency limit value and the operating frequency of the compressor involved in step 22 may further include:

[0049] Step 31: Each time the condensing pressure frequency limit value is increased, the operating frequency of the compressor is increased;

[0050] Step 32, after each increase, determining the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature a preset time ago and the heating rate of the energy storage battery;

[0051] In step 33, if the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature a preset time ago is greater than 0, and the temperature rise rate of the energy storage battery is greater than a second preset threshold, the condensing pressure frequency limit value is increased again based on the previous value, and the operating frequency of the compressor is increased again to reduce the temperature of the energy storage battery.

[0052] For the above steps 31 to 33, in the specific example, the condensing pressure frequency limit value increased each time can be 0.2 MPa. For example, if the current condensing pressure frequency limit value is 3.5 MPa, then when the current condensing pressure is between 3.4 MPa and 3.6 MPa, the condensing pressure frequency limit value can be increased from 3.5 MPa to 3.7 MPa. At this time, the operating frequency of the compressor can be further increased to cool the energy storage battery. After the first increase of the condensing pressure frequency limit value and the operating frequency of the compressor, if the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature before the preset time is still greater than 0, and the heating rate of the energy storage battery is still greater than the second preset threshold, it indicates that the cooling effect is not very good at this time, and the condensing pressure frequency limit value needs to be further increased, that is, the condensing pressure frequency limit value needs to be increased from 3.7 MPa to 3.9 MPa to further increase the operating frequency of the compressor. The cycle is repeated until the following conditions occur, at which time the increase of the condensing pressure frequency limit value and the increase of the operating frequency of the compressor are stopped:

[0053] 1) The operating frequency of the compressor increases to the maximum operating frequency;

[0054] 2) The condensing pressure frequency limit value rises to the maximum condensing pressure value;

[0055] 3) The difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature a preset time ago is less than or equal to 0, or the temperature rise rate of the energy storage battery is less than a second preset threshold.

[0056] As can be seen, when the compressor operating frequency reaches the maximum operating frequency or the condensing pressure frequency limit reaches the maximum condensing pressure value, it indicates that the energy storage battery has experienced thermal runaway and cannot be cooled by the compressor and condensing fan. Only when the difference between the energy storage battery coolant return temperature before the cycle and the energy storage battery coolant return temperature before the preset time is less than or equal to 0, or the energy storage battery temperature rise rate is less than the second preset threshold, can it be indicated that increasing the condensing pressure frequency limit and thus the compressor operating frequency can effectively control the battery temperature.

[0057] The present application is explained below through a specific embodiment of the present application. The specific embodiment provides a method for predicting and controlling thermal failure of an energy storage liquid cooling device. The method includes the following situations:

[0058] 1) High environment (T 环 >40℃)

[0059] Case 1: After detecting T 电池 ≥m℃, if Pe (condensing pressure) is less than P (condensing pressure frequency limit value enters), the energy storage liquid cooling device is controlled to enter the maximum load mode, that is, the compressor target frequency F=F max(maximum frequency of compressor operation), and the condensing fan target frequency H=H max (maximum fan frequency), at which point the load has reached its maximum cooling capacity. m is the preset upper limit for the battery to experience thermal runaway.

[0060] If T is still detected 回液 (Current) -T 回液 (1 minute ago)>0 and the battery temperature rise rate of △t>n (fixed constant), it means that thermal runaway has occurred at this time, the device output is the maximum capacity, and dynamic adjustment cannot be performed. 回液 Refers to the battery coolant supply temperature.

[0061] Case 2:

[0062] If [Condensing pressure frequency limit value + 0.1MPa] ≥ Pe ≥ P [Condensing pressure frequency limit value - 0.1MPa] and condensing fan frequency H = H max Enter the load frequency limiting mode, at this time the compressor is affected by the condensing pressure and the frequency is limited. At this time, the entry mode is determined by the comprehensive judgment of the system heat and battery. If within three minutes, the test is still three times: T 回液 (Current) -T 回液 (1 minute ago)>0 and △t battery temperature rise rate>n (fixed constant), then enter the thermal runaway prediction temporary release mode.

[0063] Execute step S1: Replace P[condensing pressure frequency limit value] with P[condensing pressure frequency limit value + 0.2 MPa]. Increase the compressor frequency until Pe = P[condensing pressure frequency limit value + 0.2 MPa].

[0064] If the test is still T after three times within three minutes: 回液 (Current) -T 回液 (1 minute ago)>0 and △t battery heating rate>n (fixed constant), then repeat S1: P[condensing pressure limit frequency value+0.2MPa] is replaced by P[condensing pressure limit frequency value+0.4MPa], and the compressor frequency is increased until Pe=P[condensing pressure limit frequency value+0.4MPa].

[0065] The loop ends when any of the following conditions are met:

[0066] Condition 1: T 回液 (Current) -T 回液 (1 minute ago) ≤ 0 or △t battery temperature rise rate < n. Leave thermal runaway prediction temporary release mode and enter load frequency limit mode.

[0067] Condition 2: The compressor frequency reaches the maximum. The thermal runaway prediction temporary release mode is maintained and the maximum load mode - thermal runaway warning is displayed.

[0068] Condition 3: P [Condensing Pressure Limit]. For R410A refrigerant, the condensing pressure limit can be raised to a maximum of 4.6 MPa. The thermal runaway prediction temporary release mode is maintained, and the load limit mode - thermal runaway warning + high pressure warning - is displayed.

[0069] 2) Normal temperature environment (T 环 ≤40℃)

[0070] If T is detected 电池 ≥m℃, then execute the compressor target frequency F=F max , condensing fan target frequency H=H max , at this time the load has reached the maximum cooling capacity, if it is detected: T 回液 (Current) -T 回液 (1 minute ago)>0 and △t battery temperature rise rate>n (fixed constant), the maximum load mode - thermal runaway warning is displayed.

[0071] The battery thermal runaway prediction and control method described in this application can accurately predict thermal runaway in energy storage batteries before it occurs, and adopt active control strategies to effectively suppress abnormal increases in battery temperature and avoid the occurrence of thermal runaway, thereby significantly improving the thermal safety of the energy storage system. Furthermore, by increasing the condensing pressure frequency limit, it can intelligently decide whether to prioritize battery thermal management or the reliability of energy storage liquid cooling equipment, avoiding system performance degradation or equipment damage caused by excessively high ambient temperatures, and significantly improving the system's adaptability and stability in extreme environments.

[0072] Corresponding to the above Figure 2 , the embodiment of the present application also provides a control device for energy storage liquid cooling equipment, such as Figure 3 As shown, the device includes:

[0073] A first acquisition module 302 is configured to acquire a current condensing pressure of the energy storage liquid cooling device when it is detected that the temperature of the energy storage battery in the energy storage liquid cooling device exceeds a preset temperature;

[0074] The second acquisition module 304 is used to obtain a comparison result between the current condensing pressure and the condensing pressure frequency limit value;

[0075] The control module 306 is configured to control the operating frequencies of the compressor and the condensing fan in the energy storage liquid cooling device and / or adjust the condensing pressure frequency limit value according to the comparison result, so as to reduce the temperature of the energy storage battery.

[0076] Through the device of the embodiment of the present application, when it is detected that the temperature of the energy storage battery in the energy storage liquid cooling device exceeds the preset temperature, the comparison result between the current condensing pressure and the condensing pressure frequency limit value is obtained, and then according to the comparison result, the operating frequency of the compressor and the condensing fan in the energy storage liquid cooling device is controlled and / or the condensing pressure frequency limit value is adjusted to reduce the temperature of the energy storage battery. That is, in the present application, when the energy storage battery has a high temperature, corresponding measures can be taken to prevent the energy storage battery from continuing to heat up. The purpose of controlling the operating frequency of the compressor and the condensing fan, and adjusting the condensing pressure frequency limit value is to reduce the temperature. Therefore, it can be adjusted upward or downward according to actual needs. It is not just a limited operation, but a corresponding control according to actual needs. Therefore, through the above-mentioned method of the present application, the abnormal increase of the battery temperature is effectively suppressed, and the thermal management efficiency of the energy storage liquid cooling device is improved.

[0077] In an optional implementation manner of the embodiment of the present application, the control module in the embodiment of the present application may further include: a first control unit, used to control the compressor to operate at the maximum frequency and control the condensing fan to operate at the maximum frequency when the current condensing pressure is less than the condensing pressure frequency limit value, so as to reduce the temperature of the energy storage battery.

[0078] In an optional implementation manner of the embodiment of the present application, the control module in the embodiment of the present application may further include: a second control unit, used to control the condensing fan to operate at the maximum frequency when the current condensing pressure is between the condensing pressure frequency limit value and the first preset threshold value; a second control unit, used to reduce the temperature of the energy storage battery by successively increasing the condensing pressure frequency limit value and successively increasing the operating frequency of the compressor.

[0079] In an optional implementation manner of the embodiment of the present application, the second control unit in the embodiment of the present application may further include: a first processing unit, configured to increase the operating frequency of the compressor once each time the condensing pressure frequency limit value is increased; a second processing unit, configured to determine, after each increase, the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature a preset time ago, and the heating rate of the energy storage battery; and a third processing unit, configured to increase the condensing pressure frequency limit value again on the basis of the previous time, and to increase the operating frequency of the compressor again, so as to reduce the temperature of the energy storage battery, if the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature a preset time ago is greater than 0 and the heating rate of the energy storage battery is greater than a second preset threshold.

[0080] In an optional implementation manner of the embodiment of the present application, the device in the embodiment of the present application further includes: a stop module, which is used to stop increasing the condensing pressure frequency limit value and stop increasing the operating frequency of the compressor when one of the following conditions is met: the operating frequency of the compressor is increased to the maximum operating frequency; the condensing pressure frequency limit value is increased to the maximum condensing pressure value; the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature before the preset time is less than or equal to 0; the heating rate of the energy storage battery is less than the second preset threshold.

[0081] In an optional implementation manner of the embodiment of the present application, the device in the embodiment of the present application further includes: a first determination module, configured to determine, after controlling the compressor to operate at the maximum frequency and controlling the condensing fan to operate at the maximum frequency, a difference between a current energy storage battery coolant return temperature and a preset time period ago, and a heating rate of the energy storage battery; and a second determination module, configured to determine that the energy storage liquid cooling device is in a thermal runaway state when the difference between the current energy storage battery coolant return temperature and the preset time period ago is greater than 0 and the heating rate of the energy storage battery is greater than a second preset threshold.

[0082] like Figure 4 As shown, the embodiment of the present application provides an energy storage liquid cooling device, including a processor 411, a communication interface 412, a memory 413 and a communication bus 414, wherein the processor 411, the communication interface 412, and the memory 413 communicate with each other through the communication bus 414.

[0083] Memory 413, for storing computer programs;

[0084] In one embodiment of the present application, the processor 411 is used to execute the program stored in the memory 413 to implement the control method of the energy storage liquid cooling device provided by any of the aforementioned method embodiments. The role it plays is similar and will not be repeated here.

[0085] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the control method for the energy storage liquid cooling device provided in any of the aforementioned method embodiments are implemented.

[0086] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0087] Through the description of the above embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a general hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the relevant technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0088] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0089] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A control method for energy storage liquid cooling equipment, characterized in that: include: When it is detected that the temperature of the energy storage battery in the energy storage liquid cooling device exceeds a preset temperature, obtaining a current condensing pressure of the energy storage liquid cooling device; Obtaining a comparison result between the current condensing pressure and the condensing pressure frequency limit value; According to the comparison result, the operating frequencies of the compressor and the condensing fan in the energy storage liquid cooling device are controlled and the condensing pressure frequency limit value is adjusted to reduce the temperature of the energy storage battery; According to the comparison result, controlling the operating frequencies of the compressor and the condensing fan in the energy storage liquid cooling device and adjusting the condensing pressure frequency limit value to reduce the temperature of the energy storage battery includes: controlling the condensing fan to operate at a maximum frequency when the current condensing pressure is between a first preset threshold value and a positive threshold value of the condensing pressure frequency limit value; and reducing the temperature of the energy storage battery by sequentially increasing the condensing pressure frequency limit value and the operating frequency of the compressor; wherein, the larger the condensing pressure frequency limit value, the correspondingly higher the operating frequency of the compressor; The method of lowering the temperature of the energy storage battery by sequentially increasing the condensing pressure frequency limit value and the operating frequency of the compressor includes: increasing the operating frequency of the compressor each time the condensing pressure frequency limit value is increased; determining the difference between a current return temperature of the energy storage battery coolant and a return temperature of the energy storage battery coolant a preset time ago and a heating rate of the energy storage battery after each increase of the condensing pressure frequency limit value; and if the difference between the current return temperature of the energy storage battery coolant and the return temperature of the energy storage battery coolant a preset time ago is greater than 0 and the heating rate of the energy storage battery is greater than a second preset threshold, increasing the condensing pressure frequency limit value again based on the previous increase, and increasing the operating frequency of the compressor again, so as to lower the temperature of the energy storage battery.

2. The method according to claim 1, characterized in that The method further comprises: When one of the following conditions is met, the increase of the condensing pressure frequency limit value and the increase of the operating frequency of the compressor are stopped: The operating frequency of the compressor is increased to the maximum operating frequency; The condensing pressure frequency limit value increases to the maximum condensing pressure value; The difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature before the preset time is less than or equal to 0; The temperature rise rate of the energy storage battery is less than the second preset threshold.

3. The method according to claim 1, characterized in that After controlling the compressor to operate at a maximum frequency and controlling the condensing fan to operate at a maximum frequency, the method further includes: Determine the difference between the current energy storage battery coolant return temperature and the energy storage battery coolant return temperature a preset time ago and the heating rate of the energy storage battery; When the difference between the current return temperature of the energy storage battery coolant and the return temperature of the energy storage battery coolant a preset time ago is greater than 0, and the temperature rise rate of the energy storage battery is greater than a second preset threshold, it is determined that the energy storage liquid cooling device is in a thermal runaway state.

4. A control device for energy storage liquid cooling equipment, characterized in that: include: A first acquisition module is configured to acquire a current condensing pressure of the energy storage liquid cooling device when it is detected that the temperature of the energy storage battery in the energy storage liquid cooling device exceeds a preset temperature; A second acquisition module is used to obtain a comparison result between the current condensing pressure and the condensing pressure frequency limit value; a control module, configured to control the operating frequencies of the compressor and the condensing fan in the energy storage liquid cooling device and adjust the condensing pressure frequency limit value according to the comparison result, so as to reduce the temperature of the energy storage battery; The control module includes: a second control unit, configured to control the condensing fan to operate at a maximum frequency when the current condensing pressure is between a first preset threshold value and a condensing pressure frequency limit value; a second control unit, configured to reduce the temperature of the energy storage battery by sequentially increasing the condensing pressure frequency limit value and the operating frequency of the compressor; the larger the condensing pressure frequency limit value, the higher the corresponding operating frequency of the compressor; The second control unit includes: a first processing unit configured to increase the operating frequency of the compressor each time the condensing pressure frequency limit value is increased; a second processing unit configured to determine, after each increase, a difference between a current energy storage battery coolant return temperature and a preset battery coolant return temperature a predetermined time ago, and a heating rate of the energy storage battery; and a third processing unit configured to increase the condensing pressure frequency limit value and the operating frequency of the compressor again based on the previous increase, so as to reduce the temperature of the energy storage battery if the difference between the current energy storage battery coolant return temperature and the preset battery coolant return temperature a predetermined time ago is greater than 0 and the heating rate of the energy storage battery is greater than a second preset threshold.

5. An energy storage liquid cooling device, comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor coupled to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to execute the control method of the energy storage liquid cooling device according to any one of claims 1 to 3.

6. A computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method of the energy storage liquid cooling device according to any one of claims 1 to 3.

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