Battery cooling system control method, device, system, apparatus and storage medium

Abstract

The present disclosure provides a battery cooling system control method, device, system, equipment and storage medium, relating to the technical field of battery cooling. The method comprises: in response to obtaining a refrigeration request, starting the compressor of the battery cooling system; obtaining the working condition parameters of the battery, and the real-time cooling liquid temperature and the target cooling liquid temperature of the battery cooling system, calculating the first temperature difference between the real-time cooling liquid temperature and the target cooling liquid temperature; if the first temperature difference and the working condition parameters meet the preset correction condition, the first temperature difference is corrected according to the working condition parameters of the battery to obtain the second temperature difference, and the second temperature difference is smaller than the first temperature difference; the compressor speed is determined according to the second temperature difference, and the compressor is controlled to operate according to the compressor speed. The present disclosure can effectively avoid the compressor speed being unnecessarily raised, and significantly reduce the noise generated during the operation of the battery cooling system.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a battery cooling system control method, a battery cooling system control device, an energy storage system, an electronic device, and a computer-readable storage medium. Background Technology

[0002] As battery energy density increases, current energy storage cells face challenges in thermal stability. Battery cooling systems are used to cool the batteries and achieve thermal management.

[0003] In related technologies, battery cooling typically uses water temperature deviation to calculate compressor speed. However, this control method tends to increase compressor speed, especially in high ambient temperature environments, resulting in excessive noise from the refrigeration unit. Summary of the Invention

[0004] This disclosure provides a battery cooling system control method, apparatus, system, equipment, and storage medium, which at least to some extent overcomes the problem that battery cooling methods provided in related technologies easily cause excessive noise in the operation of the refrigeration unit.

[0005] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0006] According to one aspect of this disclosure, a battery cooling system control method is provided, comprising: in response to receiving a cooling request, starting a compressor of the battery cooling system; acquiring battery operating parameters, and a real-time coolant temperature and a target coolant temperature of the battery cooling system, and calculating a first temperature difference between the real-time coolant temperature and the target coolant temperature; if the first temperature difference and the operating parameters satisfy a preset correction condition, correcting the first temperature difference according to the battery operating parameters to obtain a second temperature difference, wherein the second temperature difference is less than the first temperature difference; determining a compressor speed according to the second temperature difference, and controlling the compressor operation according to the compressor speed.

[0007] In some embodiments of this disclosure, the battery's operating parameters include the current cell temperature and the current ambient temperature. Correcting the first temperature difference based on the battery's operating parameters to obtain a second temperature difference includes: determining a correction coefficient based on the current cell temperature and the current ambient temperature, wherein the correction coefficient is less than 1; and determining the second temperature difference based on the first temperature difference and the correction coefficient.

[0008] In some embodiments of this disclosure, determining the correction coefficient based on the current cell temperature and the current ambient temperature includes: determining the correction coefficient corresponding to the current cell temperature and the current ambient temperature based on a preset temperature difference correction table, wherein the preset temperature difference correction table characterizes the correspondence between the cell temperature, the ambient temperature and the correction coefficient.

[0009] In some embodiments of this disclosure, determining the compressor speed based on the second temperature difference includes: determining a first compensation amount for the compressor based on the second temperature difference; and determining the compressor speed based on the first compensation amount and a preset base speed.

[0010] In some embodiments of this disclosure, determining the compressor speed based on the second temperature difference includes: determining a first compensation amount for the compressor based on the second temperature difference; determining a second compensation amount for the compressor based on the first temperature difference; and determining the compressor speed based on the first compensation amount, the second compensation amount, and a preset base speed.

[0011] In some embodiments of this disclosure, the first compensation amount includes a proportional term compensation amount and an integral term compensation amount; wherein, determining the first compensation amount of the compressor based on the second temperature difference includes: determining the proportional term compensation amount of the compressor based on the second temperature difference and the proportional gain coefficient of the compressor; performing an integral operation on the second temperature difference and the integral gain coefficient of the compressor to obtain an integral operation value, which is used as the integral term compensation amount of the compressor.

[0012] In some embodiments of this disclosure, determining the compressor speed based on the first compensation amount and the preset base speed includes: obtaining a first speed compensation amount based on the first compensation amount and the preset speed conversion coefficient; and taking the sum of the first speed compensation amount and the preset base speed as the compressor speed.

[0013] In some embodiments of this disclosure, determining the compressor speed based on the first compensation amount, the second compensation amount, and the preset base speed includes: obtaining a second speed compensation amount based on the first compensation amount, the second compensation amount, and the preset speed conversion coefficient; and using the sum of the second speed compensation amount and the preset base speed as the compressor speed.

[0014] In some embodiments of this disclosure, the battery's operating parameters include the current ambient temperature; the preset correction conditions include a preset temperature difference threshold and a preset ambient temperature threshold; the method further includes: if the first temperature difference is greater than the preset temperature difference threshold and the current ambient temperature is greater than or equal to the preset ambient temperature threshold, then it is determined that the first temperature difference and the operating parameters satisfy the preset correction conditions.

[0015] In some embodiments of this disclosure, the method further includes: if at least one of the first temperature difference and the operating condition parameter does not meet the preset correction condition, then determining the compressor speed based on the first temperature difference.

[0016] In some embodiments of this disclosure, the battery cooling system includes a coolant circuit and a refrigerant circuit. The coolant circuit is connected to a cell heat exchange plate, a liquid pump, and a heat exchanger. The refrigerant circuit is connected to the heat exchanger, the compressor, and a condenser. A condenser fan is correspondingly installed on the condenser. The method further includes: starting the condenser fan in response to the battery cooling system operating mode being a cooling mode and the system pressure of the battery cooling system reaching a preset pressure threshold; determining the initial speed of the condenser fan based on the system pressure of the battery cooling system and the current ambient temperature; determining the linkage coefficient of the condenser fan based on the compressor speed change rate and the current cell temperature; determining the target speed of the condenser fan based on the initial speed and the linkage coefficient, and controlling the condenser fan to operate at the target speed.

[0017] In some embodiments of this disclosure, determining the initial speed of the condenser fan based on the system pressure of the battery cooling system and the current ambient temperature includes: determining the fan speed level corresponding to the system pressure of the battery cooling system and the current ambient temperature according to a preset speed level table, and using the fan speed level as the initial speed of the condenser fan, wherein the preset speed level table represents the correspondence between system pressure, ambient temperature and initial speed level.

[0018] In some embodiments of this disclosure, determining the linkage coefficient of the condenser fan based on the compressor's speed change rate and the current battery cell temperature includes: determining the linkage coefficient corresponding to the compressor's speed change rate and the current battery cell temperature according to a preset linkage coefficient table, wherein the preset linkage coefficient table characterizes the correspondence between the compressor's speed change rate, the battery cell temperature, and the linkage coefficient.

[0019] According to another aspect of this disclosure, a battery cooling system control device is also provided, comprising: a request response module, configured to start the compressor of the battery cooling system in response to receiving a cooling request; a temperature difference determination module, configured to acquire the battery's operating parameters, and the real-time coolant temperature and target coolant temperature of the battery cooling system, and calculate a first temperature difference between the real-time coolant temperature and the target coolant temperature; a temperature difference correction module, configured to correct the first temperature difference according to the battery's operating parameters to obtain a second temperature difference if the first temperature difference and the operating parameters meet a preset correction condition, wherein the second temperature difference is less than the first temperature difference; and an operation control module, configured to determine the compressor speed according to the second temperature difference, and control the compressor operation according to the compressor speed.

[0020] According to another aspect of this disclosure, an energy storage system is also provided, including a battery and a battery cooling system, wherein the battery cooling system cools the battery using the battery cooling system control method described above.

[0021] According to another aspect of this disclosure, an electronic device is also provided, including a processor and a memory, the memory storing a computer program that, when executed by the processor, implements the battery cooling system control method of the above embodiments.

[0022] According to another aspect of this disclosure, a computer-readable storage medium is also provided, wherein a computer program is stored therein, and when executed by a processor, the computer program implements the battery cooling system control method of the above embodiments.

[0023] According to another aspect of this disclosure, a computer program product is also provided, including a computer program that, when executed by a processor, implements the battery cooling system control method of any of the above.

[0024] In this embodiment, after receiving a cooling request and starting the compressor, a first temperature difference between the real-time coolant temperature and the target coolant temperature is calculated. When the first temperature difference and the battery's operating parameters meet preset correction conditions, the first temperature difference is precisely corrected by combining the battery's operating parameters. This effectively avoids interference from excessively high ambient temperatures on the temperature difference between the real-time and target coolant temperatures, ensuring the accuracy and rationality of the temperature difference calculation. Determining the compressor speed based on the smaller corrected second temperature difference effectively prevents the compressor speed from being unnecessarily increased, thereby significantly reducing the noise generated during compressor operation. It also optimizes compressor energy consumption, improves the stability of the battery cooling system, and provides a better user experience.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0027] Figure 1 This diagram illustrates the structure of an energy storage system provided in an embodiment of the present disclosure.

[0028] Figure 2 This diagram illustrates a flowchart of a battery cooling system control method provided in an embodiment of the present disclosure.

[0029] Figure 3 This diagram illustrates the structure of a battery cooling system provided in an embodiment of the present disclosure.

[0030] Figure 4 This diagram illustrates another battery cooling system control method provided in an embodiment of the present disclosure.

[0031] Figure 5 This diagram illustrates a flowchart of another battery cooling system control method provided in an embodiment of the present disclosure.

[0032] Figure 6 A schematic diagram of another cooling system provided in an embodiment of this disclosure is shown.

[0033] Figure 7 The diagram shows a flowchart of a compressor and condenser fan linkage control method provided in an embodiment of this disclosure.

[0034] Figure 8 This diagram illustrates an example of a battery cooling system control method provided in an embodiment of the present disclosure.

[0035] Figure 9 The following is a flowchart illustrating a second example of a battery cooling system control method provided in this disclosure.

[0036] Figure 10 The following is a flowchart of an example three of the battery cooling system control methods provided in this disclosure.

[0037] Figure 11 This diagram illustrates the structure of a battery cooling system control device according to an embodiment of the present disclosure.

[0038] Figure 12This diagram illustrates the structure of an electronic device provided in an embodiment of the present disclosure. Detailed Implementation

[0039] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0040] The terms "first" and "second" used in this document are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly stated.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0043] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form based on future application needs. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0044] Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak demand periods, and excessive power during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, this energy can be converted back into electrical energy and released. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0045] Taking electrochemical energy storage as an example, this solution provides an energy storage device 110, which is applied to the energy storage system 100. The energy storage device 110 is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0046] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices 110 include: (1) Large-scale energy storage power stations (including multiple prefabricated energy storage modules) applied to wind power and photovoltaic power stations can help renewable energy power generation meet grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the renewable energy absorption capacity, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation. (2) The energy storage prefabricated cabin applied on the grid side mainly functions as peak regulation, frequency regulation and grid congestion relief. In terms of peak regulation, it can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption. (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge during peak loads, thereby reducing peak power and the maximum demand declared, achieving the goal of reducing capacity costs. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0047] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 100 according to an embodiment of this application. Figure 1 And this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device in this application is not limited to a prefabricated energy storage module in the generation and distribution energy storage scenario.

[0048] This application provides an energy storage system 100, which includes: a high-voltage cable 120, a first power conversion device 130, a second power conversion device 140, and an energy storage device 110 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 140 can be a wind power conversion device. Since the electricity generated by the wind power conversion device is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device 110 through grid connection. The energy storage device 110 is connected to the high-voltage cable 120 and outputs smooth electricity to supply the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, wind power conversion... The power conversion device is always connected to the high-voltage cable 120. Under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable 120. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in the energy storage device 110 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 110 together with the high-voltage cable 120 in grid-connected mode to supply power to the power consumption side. This provides the power grid with various services such as peak shaving, frequency regulation, and backup, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0049] In some embodiments on the distribution network side, the first power conversion device 130 can be a photovoltaic panel, and the energy storage device 110 is connected to the photovoltaic panel and installed downstream of the high-voltage cable 120 and between the user load. The electrical energy output by the photovoltaic panel is stored in the energy storage device 110, which can respond in a timely manner to act as a backup power source when the power grid / distribution network fails; or, it can provide power supply support to alleviate line congestion when the high-voltage cable 120 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0050] Optionally, the first power conversion device 130 may include, but is not limited to, a photovoltaic panel, and the second power conversion device 140 may include, but is not limited to, a wind power conversion device. The first power conversion device 130 and the second power conversion device 140 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0051] Optionally, the energy storage device 110 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0052] Optionally, the energy storage device 110 may include battery modules, battery packs, battery clusters, mobile power supplies, energy storage cabinets / prefabricated energy storage compartments, and other battery integrated systems composed of individual battery cells. The actual application form of the energy storage device 110 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 110.

[0053] Alternatively, the individual battery cell is not limited to at least one of cylindrical, prismatic, prismatic, or other shaped batteries.

[0054] Optionally, the individual battery cell can be a rechargeable battery, which refers to a single battery cell that can be recharged after discharge to activate the active materials and continue to be used. The individual battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not specifically limit its type.

[0055] With the increase in battery energy density, especially in power batteries, current energy storage cells face challenges in thermal stability. Battery cooling systems can be used to cool the batteries and achieve thermal management.

[0056] The battery cooling system includes a coolant circuit and a cooling circuit. The coolant circuit is equipped with a refrigeration unit, which includes a compressor, heat exchanger, condenser, and condenser fan. The cooling circuit is connected to the cell heat exchange plate.

[0057] In related technologies, cooling control logic typically calculates compressor speed based on the temperature deviation between the actual and target water temperatures. However, when the refrigeration unit operates in high ambient temperature environments, the temperature deviation between the actual and target water temperatures is usually large. In this case, the temperature deviation used to calculate the compressor speed is significantly increased, resulting in an excessively high calculated compressor speed. This leads to an increase in compressor discharge pressure and a simultaneous increase in condenser fan speed, which in turn causes excessive noise from the refrigeration unit, severely impacting the user experience and the comfort of the surrounding environment.

[0058] In summary, the battery cooling system control methods in related technologies rely on the temperature deviation between the real-time water temperature and the target water temperature, which can easily lead to problems such as excessive compressor speed and excessive noise. The noise control effect is even worse in high ambient temperature scenarios.

[0059] To address at least some of the aforementioned technical problems, this disclosure provides a battery cooling system control method, which, in response to receiving a cooling request, starts the compressor of the battery cooling system; acquires the battery's operating parameters, as well as the real-time coolant temperature and target coolant temperature of the battery cooling system, and calculates a first temperature difference between the real-time coolant temperature and the target coolant temperature; if the first temperature difference and the operating parameters meet preset correction conditions, the first temperature difference is corrected according to the battery's operating parameters to obtain a second temperature difference, wherein the second temperature difference is less than the first temperature difference; the compressor speed is determined based on the second temperature difference, and the compressor operation is controlled according to the compressor speed.

[0060] The battery cooling system control method disclosed herein, upon receiving a cooling request and starting the compressor, calculates a first temperature difference between the real-time coolant temperature and the target coolant temperature. When the first temperature difference and the battery's operating parameters meet preset correction conditions, the first temperature difference is precisely corrected by combining the battery's operating parameters. This effectively avoids interference from excessively high ambient temperatures on the temperature difference between the real-time and target coolant temperatures, ensuring the accuracy and rationality of the temperature difference calculation. Determining the compressor speed based on a smaller corrected second temperature difference effectively prevents the compressor speed from being unnecessarily increased, thereby significantly reducing the noise generated during compressor operation. It also optimizes compressor energy consumption, improves the stability of the battery cooling system operation, and provides a better user experience.

[0061] The battery cooling system control method disclosed herein can be applied to high ambient temperature scenarios to regulate the noise of the cooling unit while ensuring battery cooling performance; it can also be applied to scenarios where the energy storage system needs to regulate the noise of the cooling unit when operating under other harsh conditions. This disclosure uses a high-temperature environment scenario as an example for illustration.

[0062] This disclosure provides a battery cooling system control method, which can be executed by any electronic device with computing power. For example, a thermal management system or battery cooling system, etc., are described in this disclosure. Figure 3 The following explanation uses the battery cooling system 200 as an example. The battery cooling system may include a programmable logic controller (PLC) or a microcontroller, as long as it can perform the corresponding functions.

[0063] Figure 2 This diagram illustrates a flowchart of a battery cooling system control method according to an embodiment of the present disclosure. Figure 2 As shown, the battery cooling system control method provided in this embodiment includes the following steps S202~S208. Wherein: S202. In response to receiving a cooling request, the compressor 211 of the battery cooling system 200 is started.

[0064] like Figure 3 As shown, in some embodiments, the battery cooling system 200 includes a refrigerant circuit 21 and a coolant circuit 22. The refrigerant circuit 21 is connected to a heat exchanger 213, a compressor 211, and a condenser 212, with the condenser 212 corresponding to a condenser fan 214. The coolant circuit 22 is connected to a cell heat exchange plate 222, a liquid pump 221, and the heat exchanger 213. The battery cooling system 200 utilizes the compressor 211 for refrigeration, along with the condenser 212, to form a cooling circuit. The heat exchanger 213 facilitates heat exchange between the refrigerant circuit 21 and the coolant circuit 22, cooling the coolant in the coolant circuit 22. The coolant is then pumped by the liquid pump 221 and passed through the cell heat exchange plate 222 to cool the battery.

[0065] Continue to refer to Figure 3 In the refrigerant circuit 21, a liquid receiver 215 and an electronic expansion valve 216 can also be connected. The liquid receiver 215 is used to store refrigerant, such as carbon dioxide. In addition, a low-pressure temperature sensor and a low-pressure charging valve are connected in the piping between the compressor 211 and the heat exchanger 213; a high-pressure sensor and a pressure switch are connected in the piping between the compressor 211 and the condenser 212; and a high-pressure charging valve and a dryer filter are connected in the piping between the condenser 212 and the electronic expansion valve 216. This disclosure does not specifically limit the specific structure of the refrigerant circuit 21.

[0066] In some embodiments, in the coolant circuit 22, an inlet water temperature sensor, an inlet water pressure sensor, an automatic air vent, a storage tank, etc., may also be connected in the circuit between the liquid pump 221 and the cell heat exchange plate 222; an outlet water pressure sensor, an outlet water temperature sensor, a filter, etc., may also be connected in the circuit between the heat exchanger 213 and the cell heat exchange plate 222. This disclosure does not specifically limit the specific structure of the coolant circuit 22, and the coolant filled in the coolant circuit 22 can be water.

[0067] When the refrigeration unit receives a refrigeration request from the refrigeration controller (such as a host computer), it controls the compressor 211 to start. The refrigeration controller may include a programmable logic controller (PLC) or a microcontroller, as long as it can perform the corresponding functions.

[0068] S204. Obtain the battery's operating parameters, as well as the real-time coolant temperature and target coolant temperature of the battery cooling system 200, and calculate the first temperature difference between the real-time coolant temperature and the target coolant temperature.

[0069] The refrigeration controller is a device for controlling the operation of the refrigeration unit. The refrigeration controller can be electrically connected to temperature sensors, pressure sensors, etc. in the refrigerant circuit 21 and coolant circuit 22 to receive feedback signals such as temperature and pressure in the battery cooling system 200, and execute cooling logic according to the feedback signals to ensure that the coolant temperature is within the target range.

[0070] The real-time coolant temperature is the temperature value collected in real time by a temperature sensor installed in the coolant circuit 22. This temperature sensor can be located on the return line between the heat exchanger 213 and the cell heat exchange plate 222, meaning the real-time coolant temperature can be the coolant temperature after heat exchange through the heat exchanger 213. Alternatively, the temperature sensor can be located at the inlet or outlet of the cell heat exchange plate 222, meaning the real-time coolant temperature can be the coolant temperature before or after cooling the battery. It should be noted that this disclosure does not specifically limit the location of the temperature sensor for collecting the real-time coolant temperature, as long as the real-time coolant temperature can be obtained.

[0071] The target coolant temperature is the control target of the refrigeration controller. By controlling the operating parameters of the refrigeration unit, the actual coolant temperature is made close to the target coolant temperature, ensuring that the battery temperature is maintained within a suitable range.

[0072] In some embodiments, the first temperature difference is the difference between the target coolant temperature and the real-time coolant temperature, expressed as: (Formula 1); in, This is the first temperature difference value; The target coolant temperature; This is the real-time coolant temperature.

[0073] In some embodiments, the first temperature difference is the absolute value of the difference between the target coolant temperature and the real-time coolant temperature, expressed as: (Formula 2); in, This is the first temperature difference value; It is an absolute value function; The target coolant temperature; This is the real-time coolant temperature.

[0074] Battery operating parameters can include current cell temperature, current ambient temperature, etc. These parameters can be collected by the battery management system, which is electrically connected to the cooling controller.

[0075] S206. If the first temperature difference and the operating parameters meet the preset correction conditions, the first temperature difference is corrected according to the battery's operating parameters to obtain a second temperature difference, wherein the second temperature difference is less than the first temperature difference.

[0076] In some embodiments, a preset correction condition can be used as a judgment condition for entering the noise reduction control mode; the preset correction condition can be pre-configured in the refrigeration controller, and the preset correction condition can be a fixed value or a numerical range, which is not specifically limited in this disclosure.

[0077] In some embodiments, the battery's operating parameters include the current ambient temperature, and the preset correction conditions also include a preset temperature threshold and a preset ambient temperature threshold; the method further includes: obtaining the current ambient temperature; if the first temperature difference is greater than the preset temperature threshold and the current ambient temperature is greater than or equal to the preset ambient temperature threshold, then it is determined that the first temperature difference and the current ambient temperature meet the preset correction conditions.

[0078] If the first temperature difference is less than or equal to a preset temperature threshold, or the current ambient temperature is less than a preset ambient temperature threshold, or a combination of both, then it is determined that at least one of the first temperature difference and the current ambient temperature does not meet the preset correction conditions. The preset ambient temperature threshold is 30℃~35℃, for example, the preset ambient temperature threshold is 30℃. The preset temperature difference threshold is 2℃~3℃, for example, the preset temperature difference threshold is 2℃.

[0079] In this disclosure, by setting preset correction conditions and using a conditional triggering method that judges the first temperature difference with a preset temperature difference threshold and the current ambient temperature with a preset ambient temperature threshold, it is possible to avoid excessive intervention in the battery cooling system 200 when the first temperature difference is small, thereby improving the reliability of the battery cooling system 200.

[0080] In some embodiments, the battery's operating parameters include, but are not limited to, the current cell temperature and the current ambient temperature. The battery's operating parameters can be obtained through the battery management system, which is electrically connected to the cooling controller, thereby enabling the cooling controller to acquire the battery's operating parameters.

[0081] In this disclosure, correcting the first temperature difference refers to reducing the temperature difference between the real-time coolant temperature and the target coolant temperature to obtain a second temperature difference, which is determined based on the battery's operating parameters. The higher the ambient temperature and the higher the cell temperature, the smaller the second temperature difference, meaning a larger correction magnitude.

[0082] S208. Determine the compressor speed based on the second temperature difference, and control the compressor 211 to run based on the compressor speed.

[0083] In some embodiments, a second temperature difference is used instead of a first temperature difference for proportional-integral (PI) calculation to determine the compressor speed, thereby avoiding excessive increase in the compressor speed and reducing the exhaust pressure and compressor noise.

[0084] In this embodiment, after receiving a cooling request and starting the compressor 211, a first temperature difference between the real-time coolant temperature and the target coolant temperature is calculated. When the first temperature difference and the battery's operating parameters meet preset correction conditions, the first temperature difference is precisely corrected by combining the battery's operating parameters. This effectively avoids interference from excessively high ambient temperatures on the temperature difference between the real-time coolant temperature and the target coolant temperature, ensuring the accuracy and rationality of the temperature difference calculation. Determining the compressor speed based on the smaller corrected second temperature difference effectively avoids unnecessarily increasing the compressor speed, thereby significantly reducing the noise generated during compressor 211 operation. It also optimizes compressor 211 energy consumption, improves the stability of the battery cooling system 200 operation, and provides a better user experience.

[0085] Figure 4 A flowchart illustrating another battery cooling system 200 control method provided in an embodiment of this disclosure is shown. Figure 4 As shown, in some embodiments, the battery's operating parameters include the current cell temperature and the current ambient temperature: In step S206 above, the first temperature difference is corrected based on the battery's operating parameters to obtain a second temperature difference, including: S402. Determine the correction factor based on the current cell temperature and the current ambient temperature, wherein the correction factor is less than 1; S404. Determine the second temperature difference based on the first temperature difference and the correction factor.

[0086] In some embodiments, S402 above determines the correction coefficient based on the current cell temperature and the current ambient temperature, including: determining the correction coefficient corresponding to the current cell temperature and the current ambient temperature according to a preset temperature difference correction table, wherein the preset temperature difference correction table characterizes the correspondence between the cell temperature, the ambient temperature and the correction coefficient.

[0087] The preset temperature difference correction table is a pre-calibrated two-dimensional correspondence table to characterize the relationship between cell temperature, ambient temperature, and correction coefficient. Table 1 shows an example of a preset temperature difference correction table.

[0088] Table 1 Preset Temperature Difference Correction Table

[0089] In some embodiments, the correction factor is obtained by querying a preset temperature difference correction table using the bilinear interpolation method based on the current cell temperature and the current ambient temperature, as shown in Table 1. The higher the current ambient temperature, the higher the cell temperature, and the smaller the correction factor.

[0090] The correction factor α ranges from 0 to 1. The smaller the correction factor, the greater the correction to the first temperature difference, and consequently, the more significant the noise reduction effect. When the correction factor α = 1, it means that under the corresponding combination of cell temperature and ambient temperature, there is no need to correct the temperature difference between the real-time coolant temperature and the target coolant temperature; the compressor speed can be calculated using the first temperature difference. When the correction factor α < 1, such as α = 0.85, it means that under the corresponding combination of cell temperature and ambient temperature, the first temperature difference needs to be corrected to 0.85 times the first temperature difference to obtain the second temperature difference, thereby reducing the compressor speed.

[0091] In some embodiments, a preset temperature difference correction table can be pre-constructed. For example, the cell temperature sampling density and the ambient temperature sampling density can be set. The cell temperature sampling density is one cell temperature sampling point every 5°C to 20°C, such as -40°C, -20°C, 0°C, 20°C, 40°C, 60°C, 85°C, etc. The ambient temperature sampling density is one ambient temperature sampling point every 5°C, such as 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, etc.

[0092] Tests were conducted at sampling points for each combination of cell temperature and ambient temperature. The cell temperature and ambient temperature were fixed, and the battery cooling system was adjusted to a stable operating state. The noise level and cooling effect under different correction coefficients were measured. The correction coefficient that meets the preset conditions was selected as the optimal correction coefficient or the calibrated correction coefficient. Based on the cell temperature, ambient temperature and optimal correction coefficient, a preset temperature difference correction table was constructed.

[0093] The aforementioned preset conditions include: minimum noise level; water temperature control accuracy within ±0.5℃ during calibration; and a coefficient of performance (COP) value within a preset COP range. The preset COP range can be determined based on actual needs, and this disclosure does not limit it. For example, the preset COP range may be less than 0.8.

[0094] In some embodiments, for cell temperature and ambient temperature combinations not directly listed in the preset temperature difference correction table, the correction coefficient can be calculated using the bilinear interpolation method.

[0095] In this disclosure, a correction coefficient is determined by querying a preset temperature difference correction table based on the current cell temperature and the current ambient temperature. The correction coefficient is then dynamically adjusted according to the current cell temperature and the current ambient temperature, so that the temperature difference correction process can follow the changes in cell operating conditions. This avoids the influence of factors such as ambient temperature on the temperature difference between the real-time coolant temperature and the target coolant temperature, effectively preventing the compressor 211 speed from being unnecessarily increased, thereby reducing the noise of the battery cooling system 200 during operation and improving the user experience.

[0096] It should be noted that, in addition to determining the correction coefficient by looking up a table, it can also be determined by fitting, machine learning models, etc., for example, through neural networks or Long Short-Term Memory (LSTM) networks. This disclosure does not specifically limit the method of determining the correction coefficient based on the current cell temperature and the current ambient temperature. In this disclosure, the correction coefficient can be quickly determined by looking up a preset temperature difference correction table.

[0097] For example, in a machine learning model approach, the cell temperature and ambient temperature can be used as inputs to train the model, with correction coefficients as the output. By inputting the current cell temperature and ambient temperature into the trained machine learning model, the correction coefficients can be determined.

[0098] In S404, the second temperature difference is determined based on the first temperature difference and the correction factor.

[0099] The product of the first temperature difference and the correction factor can be used as the second temperature difference, that is, the second temperature difference is expressed as: (Formula 3); in, This represents the second temperature difference; α is the correction factor. This is the first temperature difference value.

[0100] In this embodiment, a correction coefficient can be determined based on the battery's operating parameters, thereby achieving accurate correction of the first temperature difference, effectively preventing the compressor 211's speed from being unnecessarily increased, reducing the influence of ambient temperature and other factors on the temperature difference between the real-time coolant temperature and the target coolant temperature, and reducing the noise of the battery cooling system 200 during operation.

[0101] Figure 5 This diagram illustrates a control method flowchart for another battery cooling system 200 provided in an embodiment of the present disclosure. Figure 5 As shown, in some embodiments, the above-described S208, which determines the compressor speed based on the second temperature difference, includes: S502. Determine the first compensation amount of compressor 211 based on the second temperature difference; S504. Determine the compressor speed based on the first compensation amount and the preset base speed.

[0102] In some embodiments, the refrigeration controller uses a PI controller to control the speed of the compressor 211. The first compensation quantity, also known as the feedback compensation quantity, uses the second temperature difference as a variable. The PI controller consists of a proportional term P and an integral term I, and the output of the PI controller is: (Formula 4); in, This is the proportional gain coefficient; To control the deviation, namely the first temperature difference or the second temperature difference of this disclosure; This is the integral gain coefficient; The integral accumulation of the deviation is used to control the steady-state error.

[0103] In some embodiments, the first compensation amount includes a proportional term compensation amount and an integral term compensation amount; wherein, the above-mentioned S502 determines the first compensation amount of the compressor 211 based on the second temperature difference, including: determining the proportional term compensation amount of the compressor 211 based on the second temperature difference and the proportional gain coefficient of the compressor 211; performing an integral operation on the second temperature difference and the integral gain coefficient of the compressor 211 to obtain an integral operation value, which is used as the integral term compensation amount of the compressor 211.

[0104] In practical implementation, after determining the second temperature difference, the PI controller calculates the proportional term compensation. The proportional term compensation for compressor 211... for: (Formula 5); in, This is the proportional gain coefficient of the compressor, which can be pre-calibrated and is generally taken as 0.5~5; This is the second temperature difference value.

[0105] After determining the second temperature difference, the PI controller calculates the integral term compensation. First, the control cycle is discretized, dividing the system startup to the current time into n control cycles, with the current control cycle being the nth control cycle. This converts the integral operation into a summation operation, simplifying the calculation. The PI controller then calculates the integral term compensation for compressor 211. for: (Formula 6); in, The integral gain coefficient of compressor 211, Pre-calibration is typically performed, with a value generally between 0.01 and 0.5. The second temperature difference value in the p-th control cycle is obtained through dynamic calculation.

[0106] In some embodiments, S504 above determines the compressor speed based on the first compensation amount and the preset base speed, including: obtaining the first speed compensation amount based on the first compensation amount and the preset speed conversion coefficient; and taking the sum of the first speed compensation amount and the preset base speed as the compressor speed.

[0107] The product of the first compensation amount and the preset speed conversion coefficient is used as the first speed compensation amount. The preset speed conversion coefficient is determined according to the model of compressor 211. For example, the preset speed conversion coefficient is 200 rpm.

[0108] The preset base speed is the minimum stable operating speed of compressor 211, which depends on the model of compressor 211, for example, 1500-2500 r / min.

[0109] compressor speed It can be represented as: (Formula 7); in, Preset base speed; This is the compensation amount for the proportional term; This is the compensation amount for the integral term; This is the preset speed conversion coefficient.

[0110] In this embodiment, the proportional term compensation amount is determined based on the second temperature difference and the proportional gain coefficient. The integral term compensation amount is obtained by integrating the second temperature difference and the integral gain coefficient, which can accurately determine the first compensation amount and provide a data basis for determining the compressor speed. The compressor speed is determined based on the first compensation amount and the preset base speed, providing a stable reference for speed control, avoiding excessive speed fluctuations, and ensuring the continuity of the battery cooling cycle. The first compensation amount can be adjusted in real time according to the dynamic changes of the second temperature difference, which can quickly respond to small changes in the second temperature difference and accurately compensate for the speed deviation of the compressor 211. Ultimately, the real-time coolant temperature quickly approaches the target coolant temperature. At the same time, it can avoid unnecessary increase in compressor speed caused by directly setting the speed based solely on the temperature difference, effectively reducing the noise of the compressor 211.

[0111] Figure 6 A flowchart illustrating another battery cooling system 200 control method provided in an embodiment of this disclosure is shown. Figure 6 As shown, in some embodiments, the above-described S208, which determines the compressor speed based on the second temperature difference, includes: S602. Determine the first compensation amount of compressor 211 based on the second temperature difference; S604. Determine the second compensation amount of compressor 211 based on the first temperature difference; S606. Determine the compressor speed based on the first compensation amount, the second compensation amount, and the preset base speed.

[0112] It should be noted that in this embodiment, the method of calculating the first compensation amount in S602 is the same as the method of calculating the first compensation amount in S502 in the previous embodiment, and both are calculated using formulas 4 to 6, which will not be repeated here.

[0113] In some embodiments, S606 above determines the compressor speed based on the first compensation amount, the second compensation amount, and the preset base speed, including: obtaining the second speed compensation amount based on the first compensation amount, the second compensation amount, and the preset speed conversion coefficient; and taking the sum of the second speed compensation amount and the preset base speed as the compressor speed.

[0114] In S604, the second compensation amount can also be called the feedforward compensation amount. It can be calculated using the following formula: (Formula 8); in, This is the feedforward gain coefficient; This is the first temperature difference value; Q is the specific heat density of the coolant; Q / 60 is the flow rate of the coolant.

[0115] In S606, the compressor speed can be expressed as: (Formula 9); in, Preset base speed; This is the compensation amount for the proportional term; This is the compensation amount for the integral term; This is the second compensation amount; This is the preset speed conversion coefficient.

[0116] It should be noted that the execution order of S602 and S604 is not limited; they can be executed sequentially or in parallel.

[0117] In this embodiment, the first temperature difference directly reflects the initial deviation between the real-time coolant temperature and the target coolant temperature, and accurately preserves the influence of interference factors such as ambient temperature and instantaneous battery heat on the temperature difference. Calculating the second compensation amount based on the first temperature difference enables the feedforward calculation to accurately capture the initial trend of temperature difference changes, predict the direction and amplitude of coolant temperature fluctuations in advance, and reduce feedforward adjustment lag. Based on the feedback adjustment of the first compensation amount, combined with the feedforward adjustment of the second compensation amount, a synergistic effect is formed, which can further optimize the response speed and accuracy of compressor speed control, effectively suppress temperature difference fluctuations, reduce noise caused by frequent compressor speed adjustments, and improve user experience.

[0118] In some embodiments, if at least one of the first temperature difference and the operating condition parameter does not meet the preset correction condition, the compressor speed is determined based on the first temperature difference.

[0119] For example, when the first temperature difference is less than or equal to a preset temperature difference threshold, and / or the current ambient temperature is less than a preset ambient temperature threshold, it is determined that at least one of the first temperature difference and the operating condition parameter does not meet the preset correction condition. The values ​​of the preset temperature difference threshold and the preset ambient temperature threshold are the same as in the aforementioned embodiments, and will not be repeated here.

[0120] In practical implementation, when the first temperature difference does not meet the preset correction conditions, the first temperature difference can be substituted into the above formula 7 or formula 9 to calculate the compressor speed, which can be adapted to different application scenarios.

[0121] Figure 7 This diagram illustrates a flowchart of a method for coordinated control of a compressor 211 and a condenser fan 214 according to an embodiment of this disclosure. Figure 7 As shown, in some embodiments, the method further includes: S702. In response to the battery cooling system 200 operating mode being cooling mode and the system pressure of the battery cooling system 200 reaching a preset pressure threshold, the condenser fan 214 is started. S704. Determine the initial speed of the condenser fan 214 based on the system pressure of the battery cooling system 200 and the current ambient temperature. S706. Determine the linkage coefficient of the condenser fan 214 based on the speed change rate of the compressor 211 and the current cell temperature. S708. Based on the initial speed and linkage coefficient, determine the target speed of the condenser fan 214, and control the condenser fan 214 to run at the target speed.

[0122] In some embodiments, in S702, the system pressure of the battery cooling system 200 can be acquired by a pressure sensor, which can be located at the condenser 212. That is, the system pressure of the battery cooling system 200 can be the pressure value inside the condenser 212. When the system pressure increases, it indicates that the condenser 212's heat dissipation efficiency is insufficient. The refrigeration controller controls the condenser fan 214 to increase its speed to accelerate heat dissipation and reduce the system pressure. When the system pressure decreases, the refrigeration controller controls the condenser fan 214 to decrease its speed to avoid excessive heat dissipation leading to excessively low system pressure and affecting the stability of the cooling cycle.

[0123] The preset pressure threshold can be pre-configured in the refrigeration controller. The value of the preset pressure threshold can be determined according to actual needs. For example, 1.2 MPa means that when the battery cooling system 200 is in refrigeration mode and the system pressure reaches 1.2 MPa, the condenser fan 214 will be started.

[0124] In S704, a fan speed range table can be pre-built. The fan speed range table can represent a two-dimensional correspondence between system pressure, ambient temperature and fan speed range. In the fan speed range table, the fan speed range can be discretized into 17 speed ranges, namely 0%, 15%, 20%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, and 95%.

[0125] The fan speed range table is calibrated based on the optimal COP (Coefficient of Performance), which refers to the compressor 211 operating at its most efficient speed, resulting in optimal energy consumption for the refrigeration unit. COP is the ratio of the cooling capacity generated by the battery cooling system 200 to the electrical power consumed. In the battery cooling system 200, taking a liquid-cooled unit as an example, the compressor 211 accounts for approximately 60% to 80% of the energy consumption, and the COP of the compressor 211 exhibits a non-linear relationship with power frequency.

[0126] In some embodiments, S704 above determines the initial speed of the condenser fan 214 based on the system pressure of the battery cooling system 200 and the current ambient temperature, including: determining the fan speed level corresponding to the system pressure of the battery cooling system 200 and the current ambient temperature according to a preset speed level table, and using the fan speed level as the initial speed of the condenser fan 214, wherein the preset speed level table represents the correspondence between system pressure, ambient temperature and initial speed level.

[0127] After determining the system pressure and current ambient temperature of the battery cooling system 200, the initial speed of the corresponding condenser fan 214 can be determined by consulting the fan speed gear table. The initial speed is represented by the speed gear, for example, the initial speed gear is 50%.

[0128] It should be noted that, in addition to determining the initial speed using a fan speed setting table, it can also be determined based on methods such as fitting or machine learning models. Using a fan speed setting table allows for quick determination of the initial speed, improving the cooling efficiency of the battery cooling system 200.

[0129] In S706, after the compressor speed is calculated using the second temperature difference, the ratio of the difference between the compressor speed before adjustment and the target speed to the speed before adjustment can be calculated to obtain the rate of change of compressor speed 211.

[0130] In some embodiments, S706 above determines the linkage coefficient of the condenser fan 214 based on the speed change rate of the compressor 211 and the current cell temperature, including: determining the linkage coefficient corresponding to the speed change rate of the compressor 211 and the current cell temperature according to a preset linkage coefficient table, wherein the preset linkage coefficient table characterizes the correspondence between the speed change rate of the compressor 211, the cell temperature and the linkage coefficient.

[0131] In some embodiments, the preset linkage coefficient table is pre-constructed and is a two-dimensional correspondence table based on the speed change rate of compressor 211, cell temperature, and linkage coefficient, wherein the value range of the linkage coefficient is 0~1. Table 2 shows an example of a preset linkage coefficient table.

[0132] Table 2 Preset Linkage Coefficient Table

[0133] In some embodiments, the linkage coefficient is obtained by looking up a preset linkage coefficient table using a linear interpolation method based on the rate of change of compressor 211 speed and the current battery cell temperature. The greater the decrease in compressor 211 speed and the higher the current battery cell temperature, the lower the linkage coefficient. It should be noted that besides using a lookup table to determine the linkage coefficient, fitting methods, machine learning models, etc., can also be used. The preset linkage coefficient table allows for rapid determination of the linkage coefficient, enabling coordinated adjustment between compressor 211 and condenser fan 214, effectively reducing the noise of the refrigeration unit.

[0134] In S708, the target speed of the condenser fan 214 is determined based on the initial speed and the linkage coefficient, and the condenser fan 214 is controlled to run at the target speed.

[0135] In practical implementation, the product of the initial speed and the linkage coefficient is calculated to obtain the coordinated speed. The corresponding fan speed setting is then matched to the coordinated speed as the target speed of the condenser fan 214. When the speed of the compressor 211 decreases due to the second temperature difference, the linkage coefficient decreases accordingly, and the speed of the condenser fan 214 decreases synchronously, further reducing the noise of the refrigeration unit and preventing excessive system pressure.

[0136] For example, the initial speed of the condenser fan 214 is determined to be 60% based on the system pressure and the current ambient temperature. When the speed of the compressor 211 decreases by 25% and the current cell temperature is 20°C, referring to Table 2, the linkage coefficient is found to be 0.7. The coordinated speed is 42%, and the fan speed setting matched with the coordinated speed is 40%, meaning the target speed of the condenser fan 214 is 40%.

[0137] In one example, under a high ambient temperature scenario of 45°C, the noise reduction control algorithm of this disclosure, compared with the related technology that only uses the first temperature difference for control, reduces the compressor speed by 12% and the condenser fan 214 speed by 10%. The operating noise of the refrigeration unit decreases from 72dB(A) to 62dB(A), and the water temperature control accuracy is maintained within ±0.3°C, meeting the design requirements.

[0138] In this embodiment, by dynamically correcting the second temperature difference and coordinating the speed control of the condenser fan 214, the operating noise of the refrigeration unit can be reduced by more than 15% in high ambient temperature scenarios, which can effectively cope with noise problems in extreme environments. The noise reduction control algorithm of this disclosure is integrated in the refrigeration controller and can be deployed through software updates without changing the hardware structure. It has high compatibility and is easy to promote.

[0139] To deepen the understanding of the control method of the battery cooling system 200 disclosed herein, the following will be combined with... Figures 8-10 Please provide an explanation.

[0140] like Figure 8 As shown, a control method for a battery cooling system 200 includes the following steps: S801: Receives cooling requests sent by the cooling controller (such as a host computer); S802. In response to receiving a cooling request, start compressor 211; S803 The battery management system collects battery operating condition data, which includes at least one of the following: current cell temperature, current ambient temperature, system pressure, real-time coolant temperature, and target coolant temperature. S804. Calculate the compressor speed based on the battery's operating data; S805. Generate compressor 211 drive signal based on the calculated compressor speed; S806, Start condenser fan 214; S807, Perform coordinated control of condenser fan 214; S808 generates the condenser fan speed signal 214; S809, Perform performance monitoring; S810, Enter the next cycle, End.

[0141] It should be noted that S802 and S803 operate in parallel after the energy storage system is powered on or during operation, and there is no specific restriction on their execution order.

[0142] like Figure 9 As shown, in one embodiment, the above-described S804, which calculates the rotational speed of compressor 211 based on battery operating data, may include: S901, Obtain the real-time coolant temperature and the target coolant temperature; S902. Calculate the first temperature difference between the real-time coolant temperature and the target coolant temperature; S903. Determine whether the first temperature difference and the current ambient temperature meet the preset correction conditions. If yes, execute S904; otherwise, execute S907. S904. Enter noise reduction mode and read the current cell temperature and current ambient temperature; S905. Determine the correction coefficient corresponding to the current cell temperature and the current ambient temperature according to the preset temperature difference correction table; S906. Calculate the second temperature difference based on the first temperature difference and the correction coefficient, and jump to S908. S907. Execute the normal mode, determine the first temperature difference, and jump to S908; S908, PI controller calculation and output; S909: Calculate the compressor speed and output the compressor 211 drive signal.

[0143] In S903, when the first temperature difference is greater than the preset temperature difference threshold (e.g., 2℃) and the current ambient temperature is greater than or equal to the preset ambient temperature threshold (e.g., 30℃), it is determined that the first temperature difference meets the preset correction condition.

[0144] like Figure 10 As shown, in one embodiment, the above-described S807 performs coordinated control of the condenser fan 214, which may include: S1001. Obtain system data, including current ambient temperature, current compressor speed, historical compressor speed, etc. S1002. Determine the initial speed according to the preset fan speed gear table; S1003. Calculate the compressor speed change rate based on the current compressor speed and the historical compressor speed; S1004, Read the current cell temperature; S1005. Based on the speed change rate of compressor 211 and the current cell temperature, query the linkage system table to determine the linkage coefficient; S1006. Determine the target speed of the condenser fan 214 based on the initial speed and linkage coefficient; S1007, outputs the target speed of the condenser fan 214.

[0145] Based on the same inventive concept, this disclosure also provides a battery cooling system control device and an energy storage system, as shown in the following embodiments. Since the principle by which this device and system embodiment solves the problem is similar to that of the above-described method embodiment, the implementation of this device and system embodiment can refer to the implementation of the above-described method embodiment, and repeated details will not be elaborated further.

[0146] Figure 11 This diagram illustrates the structure of a battery cooling system control device according to an embodiment of the present disclosure. Figure 11 As shown, in one embodiment, the battery cooling system control device provided in this disclosure includes a request response module 1110, a temperature difference determination module 1120, a temperature difference correction module 1130, and an operation control module 1140.

[0147] The request response module 1110 is used to start the compressor 211 of the battery cooling system 200 in response to receiving a cooling request. The temperature difference determination module 1120 is used to obtain the real-time coolant temperature and the target coolant temperature of the battery cooling system 200, and calculate the first temperature difference between the real-time coolant temperature and the target coolant temperature. The temperature difference correction module 1130 is used to correct the first temperature difference according to the battery's operating parameters if the first temperature difference and the operating parameters meet the preset correction conditions, so as to obtain a second temperature difference, wherein the second temperature difference is less than the first temperature difference. The operation control module 1140 is used to determine the compressor speed based on the second temperature difference and control the compressor 211 to run based on the compressor speed.

[0148] In some embodiments, the battery's operating parameters include the current cell temperature and the current ambient temperature: the temperature difference correction module 1130 is used to determine a correction coefficient based on the current cell temperature and the current ambient temperature, wherein the correction coefficient is less than 1; and to determine a second temperature difference based on the first temperature difference and the correction coefficient.

[0149] In some embodiments, the temperature difference correction module 1130 is further configured to determine a correction coefficient corresponding to the current cell temperature and the current ambient temperature according to a preset temperature difference correction table, wherein the preset temperature difference correction table represents the correspondence between the cell temperature, the ambient temperature and the correction coefficient.

[0150] In one embodiment, the operation control module 1140 is used to determine the first compensation amount of the compressor 211 based on the second temperature difference; and to determine the compressor speed based on the first compensation amount and the preset base speed.

[0151] In one embodiment, the operation control module 1140 is further configured to determine a first compensation amount of the compressor 211 based on the second temperature difference; determine a second compensation amount of the compressor 211 based on the first temperature difference; and determine the compressor speed based on the first compensation amount, the second compensation amount, and a preset base speed.

[0152] In one embodiment, the first compensation amount includes a proportional term compensation amount and an integral term compensation amount; the operation control module 1140 includes a calculation module, which is used to determine the proportional term compensation amount of the compressor 211 based on the second temperature difference and the proportional gain coefficient of the compressor 211; and to perform an integral operation on the second temperature difference and the integral gain coefficient of the compressor 211 to obtain an integral operation value, which is used as the integral term compensation amount of the compressor 211.

[0153] In one embodiment, the operation control module 1140 includes a first control module, which is used to obtain a first speed compensation amount based on a first compensation amount and a preset speed conversion coefficient; and to use the sum of the first speed compensation amount and the preset base speed as the compressor speed.

[0154] In one embodiment, the operation control module 1140 includes a second control module, which is used to obtain a second speed compensation amount based on a first compensation amount, a second compensation amount, and a preset speed conversion coefficient; and to use the sum of the second speed compensation amount and a preset base speed as the compressor speed.

[0155] In one embodiment, the battery's operating parameters include the current ambient temperature; the preset correction conditions include a preset temperature threshold and a preset ambient temperature threshold; the temperature difference correction module 1130 is further configured to determine that the first temperature difference satisfies the preset correction conditions if the first temperature difference is greater than the preset temperature difference threshold and the current ambient temperature is greater than or equal to the preset ambient temperature threshold.

[0156] In one embodiment, the operation control module 1140 is further configured to determine the compressor speed based on the first temperature difference if at least one of the first temperature difference and the operating condition parameter does not meet the preset correction condition.

[0157] In one embodiment, the battery cooling system 200 includes a coolant circuit 22 and a refrigerant circuit 21. The coolant circuit 22 is connected to a cell heat exchange plate 222, a liquid pump 221, and a heat exchanger 213. The refrigerant circuit 21 is connected to the heat exchanger 213, a compressor 211, and a condenser 212. A condenser fan 214 is correspondingly installed on the condenser 212. The device also includes a linkage control module (not shown in the figures). The linkage control module is used to start the condenser fan 214 in response to the battery cooling system 200 operating mode being cooling mode and the system pressure of the battery cooling system 200 reaching a preset pressure threshold. Based on the system pressure of the battery cooling system 200 and the current ambient temperature, the module determines the initial speed of the condenser fan 214. Based on the speed change rate of the compressor 211 and the current cell temperature, the module determines the linkage coefficient of the condenser fan 214. Based on the initial speed and the linkage coefficient, the module determines the target speed of the condenser fan 214 and controls the condenser fan 214 to operate at the target speed.

[0158] In one embodiment, the linkage control module is used to determine the fan speed level corresponding to the system pressure and current ambient temperature of the battery cooling system 200 according to a preset speed level table, and use the fan speed level as the initial speed of the condenser fan 214. The preset speed level table represents the correspondence between system pressure, ambient temperature and initial speed level.

[0159] In one embodiment, the linkage control module is used to determine the linkage coefficient corresponding to the speed change rate of the compressor 211 and the current cell temperature according to a preset linkage coefficient table, wherein the preset linkage coefficient table represents the correspondence between the speed change rate of the compressor 211, the cell temperature and the linkage coefficient.

[0160] In this embodiment, after receiving a cooling request and starting the compressor 211, a first temperature difference between the real-time coolant temperature and the target coolant temperature is calculated. When the first temperature difference and the battery's operating parameters meet preset correction conditions, the first temperature difference is precisely corrected by combining the battery's operating parameters. This effectively avoids interference from excessively high ambient temperatures on the temperature difference between the real-time coolant temperature and the target coolant temperature, ensuring the accuracy and rationality of the temperature difference calculation. Determining the compressor speed based on the smaller corrected second temperature difference effectively avoids unnecessarily increasing the compressor speed, thereby significantly reducing the noise generated during compressor 211 operation. It also optimizes compressor 211 energy consumption, improves the stability of the battery cooling system 200 operation, and provides a better user experience.

[0161] According to another aspect of this disclosure, an energy storage system, such as an energy storage container, is also provided. This energy storage system includes a battery and a battery cooling system 200, wherein the battery cooling system 200 cools the battery using the battery cooling system 200 control method provided in the above embodiments. Combined with the above-described battery cooling system 200 control method, unnecessary increases in compressor speed can be effectively avoided, thereby significantly reducing the noise generated during compressor 211 operation. Simultaneously, it can optimize compressor 211 energy consumption, improve the stability of battery cooling system 200 operation, and provide a better user experience.

[0162] It should be noted that all relevant content in each scenario designed in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0163] Those skilled in the art will understand that various aspects of this disclosure can be implemented as a system, method, or program product. Therefore, various aspects of this disclosure can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software aspects, collectively referred to herein as a "circuit," "module," or "system."

[0164] The following reference Figure 12 To describe an electronic device 1200 according to such an embodiment of the present disclosure. Figure 12 The electronic device 1200 shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments disclosed herein.

[0165] In one embodiment, the electronic device 1200 includes a processor and a memory for storing executable instructions of the processor, wherein the processor is configured to perform the above-described equalization control method by executing the executable instructions.

[0166] like Figure 12 As shown, the electronic device 1200 is manifested in the form of a general-purpose computing device. The components of the electronic device 1200 may include, but are not limited to: at least one processing unit 1210, at least one storage unit 1220, and a bus 1230 connecting different system components (including storage unit 1220 and processing unit 1210).

[0167] The storage unit stores program code, which can be executed by the processing unit 1210 to perform the steps described in the "Exemplary Methods" section of this specification according to various exemplary embodiments of this disclosure. For example, the processing unit 1210 can perform the following steps of the above method embodiment: in response to receiving a cooling request, start the compressor of the battery cooling system; acquire the battery's operating parameters, the real-time coolant temperature of the battery cooling system, and the target coolant temperature, and calculate a first temperature difference between the real-time coolant temperature and the target coolant temperature; if the first temperature difference and the operating parameters meet a preset correction condition, correct the first temperature difference according to the battery's operating parameters to obtain a second temperature difference, wherein the second temperature difference is less than the first temperature difference; determine the compressor speed according to the second temperature difference, and control the compressor operation according to the compressor speed.

[0168] Storage unit 1220 may include readable media in the form of volatile storage units, such as random access memory (RAM) 12201 and / or cache memory 12202, and may further include read-only memory (ROM) 12203.

[0169] Storage unit 1220 may also include a program / utility 12204 having a set (at least one) of program modules 12205, such program modules 12205 including but not limited to: operating system, one or more application programs, other program modules and program data, each or some combination of these examples may include an implementation of a network environment.

[0170] Bus 1230 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0171] Electronic device 1200 can also communicate with one or more external devices 1240 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with the electronic device 1200, and / or with any device that enables the electronic device 1200 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 1250. Furthermore, electronic device 1200 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 1260. Figure 12As shown, network adapter 1260 communicates with other modules of electronic device 1200 via bus 1230. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with electronic device 1200, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0172] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0173] In particular, according to embodiments of the present disclosure, the processes described above with reference to the flowcharts can be implemented as a computer program product, which includes a computer program that, when executed by a processor, implements the steps described in the "Exemplary Methods" section above according to various exemplary implementations of the present disclosure.

[0174] In exemplary embodiments of this disclosure, a computer-readable storage medium is also provided, having a computer program stored thereon that, when executed by a processor, implements the steps described in the "Exemplary Methods" section above according to various exemplary embodiments of this disclosure. This computer-readable storage medium may be a readable signal medium or a readable storage medium.

[0175] In some possible implementations, various aspects of this disclosure can also be implemented as a program product comprising a computer program that, when executed by a processor, implements the equalization control method of any of the above embodiments. In one possible embodiment, the program product includes program code that, when the program product is run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section of this specification according to various exemplary embodiments of this disclosure.

[0176] More specific examples of computer-readable storage media in this disclosure may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0177] In this disclosure, a computer-readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of transmitting, propagating, or transmitting a program for use by or in connection with an instruction execution system, apparatus, or device.

[0178] Optionally, the program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0179] In practice, program code for performing the operations of this disclosure can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0180] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to embodiments of this disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0181] Furthermore, although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps.

[0182] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, mobile terminal, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0183] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A battery cooling system control method, characterized in that, include: In response to receiving a cooling request, the compressor of the battery cooling system is started; Obtain the battery's operating parameters, as well as the real-time coolant temperature and target coolant temperature of the battery cooling system, and calculate the first temperature difference between the real-time coolant temperature and the target coolant temperature; If the first temperature difference and the operating parameters meet the preset correction conditions, the first temperature difference is corrected according to the battery's operating parameters to obtain a second temperature difference, wherein the second temperature difference is less than the first temperature difference, and the battery's operating parameters include the current cell temperature and the current ambient temperature; the preset correction conditions include a preset temperature difference threshold and a preset ambient temperature threshold. The compressor speed is determined based on the second temperature difference, and the compressor operation is controlled based on the compressor speed. The step of correcting the first temperature difference value based on the battery's operating parameters to obtain a second temperature difference value includes: A correction factor is determined based on the current cell temperature and the current ambient temperature, wherein the correction factor is less than or equal to 1; When the correction coefficient is less than 1, the second temperature difference is determined based on the first temperature difference and the correction coefficient. The method further includes: If the first temperature difference is greater than the preset temperature difference threshold and the current ambient temperature is greater than or equal to the preset ambient temperature threshold, then it is determined that the first temperature difference and the operating condition parameters satisfy the preset correction condition.

2. The battery cooling system control method according to claim 1, characterized in that, The step of determining the correction coefficient based on the current cell temperature and the current ambient temperature includes: Based on a preset temperature difference correction table, a correction coefficient corresponding to the current cell temperature and the current ambient temperature is determined, wherein the preset temperature difference correction table represents the correspondence between the cell temperature, the ambient temperature and the correction coefficient.

3. The battery cooling system control method according to claim 1, characterized in that, The step of determining the compressor speed based on the second temperature difference includes: Based on the second temperature difference, determine the first compensation amount of the compressor; The compressor speed is determined based on the first compensation amount and the preset base speed.

4. The battery cooling system control method according to claim 1, characterized in that, The step of determining the compressor speed based on the second temperature difference includes: Based on the second temperature difference, determine the first compensation amount of the compressor; Based on the first temperature difference, determine the second compensation amount of the compressor; The compressor speed is determined based on the first compensation amount, the second compensation amount, and the preset base speed.

5. The battery cooling system control method according to claim 3 or 4, characterized in that, The first compensation amount includes a proportional compensation amount and an integral compensation amount; The step of determining the first compensation amount of the compressor based on the second temperature difference includes: The proportional term compensation amount of the compressor is determined based on the second temperature difference and the proportional gain coefficient of the compressor. The second temperature difference and the integral gain coefficient of the compressor are integrated to obtain an integral value, which is used as the integral term compensation amount of the compressor.

6. The battery cooling system control method according to claim 5, characterized in that, The step of determining the compressor speed based on the first compensation amount and the preset base speed includes: The first speed compensation amount is obtained based on the first compensation amount and the preset speed conversion coefficient; The sum of the first speed compensation amount and the preset base speed is taken as the compressor speed.

7. The battery cooling system control method according to claim 4, characterized in that, The step of determining the compressor speed based on the first compensation amount, the second compensation amount, and the preset base speed includes: The second speed compensation amount is obtained based on the first compensation amount, the second compensation amount, and the preset speed conversion coefficient; The sum of the second speed compensation amount and the preset base speed is taken as the compressor speed.

8. The battery cooling system control method according to claim 1, characterized in that, The method further includes: If at least one of the first temperature difference and the operating condition parameters does not meet the preset correction condition, the compressor speed is determined based on the first temperature difference.

9. The battery cooling system control method according to claim 1, characterized in that, The battery cooling system includes a coolant circuit and a refrigerant circuit. The coolant circuit is connected to a cell heat exchange plate, a liquid pump, and a heat exchanger. The refrigerant circuit is connected to the heat exchanger, the compressor, and the condenser. The condenser is equipped with a condenser fan. The method further includes: In response to the battery cooling system operating mode being cooling mode and the system pressure of the battery cooling system reaching a preset pressure threshold, the condenser fan is activated. The initial speed of the condenser fan is determined based on the system pressure of the battery cooling system and the current ambient temperature. The linkage coefficient of the condenser fan is determined based on the compressor's speed change rate and the current battery cell temperature. Based on the initial rotational speed and the linkage coefficient, the target rotational speed of the condenser fan is determined, and the condenser fan is controlled to operate at the target rotational speed.

10. The battery cooling system control method according to claim 9, characterized in that, Determining the initial speed of the condenser fan based on the system pressure of the battery cooling system and the current ambient temperature includes: According to the preset speed range table, the fan speed range corresponding to the system pressure of the battery cooling system and the current ambient temperature is determined, and the fan speed range is used as the initial speed of the condenser fan. The preset speed range table represents the correspondence between system pressure, ambient temperature and initial speed range.

11. The battery cooling system control method according to claim 9, characterized in that, The step of determining the linkage coefficient of the condenser fan based on the compressor's speed change rate and the current battery cell temperature includes: According to the preset linkage coefficient table, the linkage coefficient corresponding to the compressor speed change rate and the current cell temperature is determined, wherein the preset linkage coefficient table represents the correspondence between the compressor speed change rate, cell temperature and linkage coefficient.

12. A battery cooling system control device, characterized in that, include: The request response module is used to start the compressor of the battery cooling system in response to receiving a cooling request; The temperature difference determination module is used to acquire the battery's operating parameters, as well as the real-time coolant temperature and target coolant temperature of the battery cooling system, and to calculate the first temperature difference between the real-time coolant temperature and the target coolant temperature. A temperature difference correction module is used to correct the first temperature difference value according to the battery's operating parameters if the first temperature difference value and the operating parameters meet preset correction conditions, thereby obtaining a second temperature difference value. The second temperature difference value is less than the first temperature difference value. The battery's operating parameters include the current cell temperature and the current ambient temperature. The preset correction conditions include a preset temperature difference threshold and a preset ambient temperature threshold. The operation control module is used to determine the compressor speed based on the second temperature difference value, and control the compressor operation based on the compressor speed; The temperature difference correction module is used to determine a correction coefficient based on the current cell temperature and the current ambient temperature, wherein the correction coefficient is less than or equal to 1; when the correction coefficient is less than 1, a second temperature difference is determined based on the first temperature difference and the correction coefficient; if the first temperature difference is greater than the preset temperature difference threshold and the current ambient temperature is greater than or equal to the preset ambient temperature threshold, then it is determined that the first temperature difference and the operating condition parameters meet the preset correction conditions.

13. An energy storage system, characterized in that, It includes a battery and a battery cooling system, wherein the battery cooling system cools the battery using the battery cooling system control method according to any one of claims 1-11.

14. An electronic device, characterized in that, It includes a processor and a memory, the memory storing a computer program that, when executed by the processor, implements the battery cooling system control method as described in any one of claims 1-11.

15. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed by a processor, implements the battery cooling system control method according to any one of claims 1 to 11.

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