Liquid cooling unit control method and device

Abstract

The embodiment of the invention provides a liquid cooling unit control method and device, and the method comprises the steps: monitoring the cell temperature of a battery in an energy storage system in real time before the charging and discharging time period of the energy storage system; determining a working mode of the liquid cooling unit based on the cell temperature; under the condition that the working mode is a pre-operation mode, determining pre-operation time of adopting the pre-operation mode according to the temperature of the battery cell; running in a pre-running mode according to the pre-running time; the pre-operation mode is used for performing refrigeration or heating operation according to the temperature of the battery cell and controlling the temperature of the battery cell. According to the invention, the operation of the liquid cooling unit in the non-charge-discharge time is reduced, the electric energy is saved, and the pre-operation cooling or heating is carried out before the charge-discharge time period, so that the energy storage system can operate in the optimal working state, and the charge-discharge efficiency of the energy storage system is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of liquid cooling control, and in particular to a liquid cooling unit control method and device. Background Art

[0002] The domestic energy storage market is "surging", and downstream energy storage integrators and battery manufacturers have begun to deploy energy storage liquid cooling technology early, and develop new products and new technologies to update product iterations. With the involvement of more and more practical application projects, liquid-cooled energy storage systems are rapidly becoming the mainstream technical route in the market. At present, the proportion of liquid cooling technology in new large storage projects on the power generation side / grid side has increased rapidly. Its application in actual projects is also gradually increasing. The explosion of the energy storage market will continue. In order to effectively promote the consumption of new energy power, large-scale and high-capacity energy storage power stations are accelerating their release. As an important part of the energy storage system, the thermal management system will benefit from the growth of energy storage installed capacity, and the energy storage temperature control market size may continue to expand. According to statistics, in 2022, China's new energy storage projects will reach 7.3GW / 15.9GWh, and the cumulative installed capacity will reach 13.1GW / 27.1GWh. Combined with the planning situation in various regions, it is expected that by the end of 2025, the cumulative installed capacity of domestic energy storage will reach nearly 80GW. According to analysis, the value of domestic energy storage temperature control shipments will reach 16.5 billion yuan in 2025. With the increase in energy storage energy and charge and discharge rates, the proportion of medium and high power energy storage products using liquid cooling will gradually increase, and liquid cooling is expected to become the mainstream solution in the future, with the penetration rate of liquid cooling technology expected to reach about 45% by 2025. However, the current energy storage system liquid cooling solution still has some problems and shortcomings, especially in terms of improving the system's charge and discharge efficiency, there is still a lack of effective solutions. Summary of the invention

[0003] The disclosed embodiment provides a liquid cooling unit control method to solve the problem that in the non-charging and discharging period, the battery cell temperature of the existing liquid cooling unit fails to reach a suitable temperature, the system cannot operate in the optimal working state, and the charging and discharging efficiency of the system is reduced.

[0004] Based on the above problems, in a first aspect, a liquid cooling unit control method is provided, comprising:

[0005] Before the energy storage system is charged and discharged, the temperature of the battery cells in the energy storage system is monitored in real time;

[0006] Based on the battery core temperature, determining the working mode of the liquid cooling unit;

[0007] When the working mode is a pre-operation mode, determining a pre-operation time of the pre-operation mode according to the battery core temperature; and

[0008] The pre-operation mode is operated according to the pre-operation time; the pre-operation mode is used to perform cooling or heating operations according to the battery core temperature to control the battery core temperature.

[0009] In combination with the first aspect, in a possible implementation manner, determining the working mode of the liquid cooling unit based on the battery core temperature includes:

[0010] When the temperature of the battery core is not less than the first preset temperature or not greater than the second preset temperature, the liquid cooling unit starts the pre-operation mode;

[0011] When the battery core temperature is lower than the first preset temperature and higher than the second preset temperature, the liquid cooling unit starts the shutdown mode.

[0012] In combination with the first aspect, in a possible implementation manner, operating in the pre-operation mode according to the pre-operation time includes:

[0013] When the battery core temperature is not less than the first preset temperature, the liquid cooling unit starts the fully automatic operation mode until the battery core temperature is not greater than the third preset temperature;

[0014] When the battery core temperature is not greater than the second preset temperature, the liquid cooling unit starts the full-automatic operation mode until the battery core temperature is not less than the fourth preset temperature.

[0015] In combination with the first aspect, in a possible implementation, the method further includes: when the energy storage system enters a charging and discharging period, the liquid cooling unit starts a fully automatic operation mode.

[0016] In combination with the first aspect, in a possible implementation manner, the liquid cooling unit starts a fully automatic operation mode, including:

[0017] When the outlet temperature of the liquid cooling unit is not less than the fifth preset temperature, the liquid cooling unit starts cooling until the outlet temperature of the liquid is not greater than the seventh preset temperature;

[0018] When the outlet temperature of the liquid cooling unit is not greater than the sixth preset temperature, the liquid cooling unit starts heating until the outlet temperature of the liquid is not less than the eighth preset temperature;

[0019] In other cases, the liquid cooling unit does not perform cooling and heating, and the water pump operates in a self-circulating manner.

[0020] In combination with the first aspect, in a possible implementation manner, the pre-run time is determined by the following first relationship:

[0021]

[0022] Among them, x represents the battery cell temperature, y represents the pre-operation time in minutes, k represents the adjustment coefficient, θ1 represents the battery cell cooling rate, and θ2 represents the battery cell heating rate.

[0023] In combination with the first aspect, in a possible implementation manner, the pre-running time is determined by the following second relationship:

[0024]

[0025] Wherein, x represents the battery core temperature, and y represents the pre-operation time.

[0026] In combination with the first aspect, in a possible implementation, the battery cell cooling rate and the battery cell heating rate are determined in advance by a pre-trained neural network model, which takes the ambient temperature and the battery cell heat capacity as inputs, and the battery cell heating rate and the battery cell cooling rate as outputs, and is trained using the battery cell heating rate and the battery cell cooling rate corresponding to the ambient temperature and the battery cell heat capacity in pre-test data as true values.

[0027] In combination with the first aspect, in a possible implementation manner, the adjustment coefficient is determined by the ambient temperature and the operating time of the battery cell and the liquid cooling unit, and is obtained by the following formula:

[0028]

[0029] Among them, k represents the adjustment coefficient, c represents the ambient temperature, ε represents the rated operating temperature of the battery cell, T1 represents the service life of the battery cell, T2 represents the service life of the liquid cooling unit, t1 represents the operating time of the battery cell, and t2 represents the operating time of the liquid cooling unit.

[0030] In a second aspect, a liquid cooling unit control device is provided, comprising:

[0031] A temperature monitoring module is used to monitor the battery cell temperature of the energy storage system in real time before the energy storage system is charged and discharged;

[0032] An operating mode determination module, used to determine the operating mode of the liquid cooling unit based on the battery core temperature;

[0033] a duration determination module, configured to determine, when the working mode is a pre-operation mode, a pre-operation time of the pre-operation mode according to the battery core temperature;

[0034] The temperature control module is used to operate in the pre-operation mode according to the pre-operation time; the pre-operation mode is used to perform cooling or heating operations according to the battery core temperature to control the battery core temperature.

[0035] In combination with the second aspect, in a possible implementation manner, in the working mode determination module, determining the working mode of the liquid cooling unit based on the battery core temperature includes:

[0036] When the temperature of the battery core is not less than the first preset temperature or not greater than the second preset temperature, the liquid cooling unit starts the pre-operation mode;

[0037] When the battery core temperature is lower than the first preset temperature and higher than the second preset temperature, the liquid cooling unit starts the shutdown mode.

[0038] In combination with the second aspect, in a possible implementation manner, the temperature control module operates in the pre-operation mode according to the pre-operation time, including:

[0039] When the battery core temperature is not less than the first preset temperature, the liquid cooling unit starts the fully automatic operation mode until the battery core temperature is not greater than the third preset temperature;

[0040] When the battery core temperature is not greater than the second preset temperature, the liquid cooling unit starts the full-automatic operation mode until the battery core temperature is not less than the fourth preset temperature.

[0041] In combination with the second aspect, in a possible implementation, the device further includes: a charge and discharge operation module, which is used to start a fully automatic operation mode of the liquid cooling unit when the energy storage system enters a charge and discharge period.

[0042] In combination with the second aspect, in a possible implementation manner, the liquid cooling unit starts a fully automatic operation mode, including:

[0043] When the outlet temperature of the liquid cooling unit is not less than the fifth preset temperature, the liquid cooling unit starts cooling until the outlet temperature of the liquid is not greater than the seventh preset temperature;

[0044] When the outlet temperature of the liquid cooling unit is not greater than the sixth preset temperature, the liquid cooling unit starts heating until the outlet temperature of the liquid is not less than the eighth preset temperature;

[0045] In other cases, the liquid cooling unit does not perform cooling and heating, and the water pump operates in a self-circulating manner.

[0046] In conjunction with the second aspect, in a possible implementation manner, the pre-run time is determined by the following first relationship:

[0047]

[0048] Among them, x represents the battery cell temperature, y represents the pre-operation time in minutes, k represents the adjustment coefficient, θ1 represents the battery cell cooling rate, and θ2 represents the battery cell heating rate.

[0049] In conjunction with the second aspect, in a possible implementation manner, the pre-run time is determined by the following second relationship:

[0050]

[0051] Wherein, x represents the battery core temperature, and y represents the pre-operation time.

[0052] In combination with the second aspect, in a possible implementation, the battery cell cooling rate and the battery cell heating rate are determined in advance by a pre-trained neural network model, which takes the ambient temperature and the battery cell heat capacity as inputs, and the battery cell heating rate and the battery cell cooling rate as outputs, and is trained using the battery cell heating rate and the battery cell cooling rate corresponding to the ambient temperature and the battery cell heat capacity in pre-test data as true values.

[0053] In combination with the second aspect, in a possible implementation manner, the adjustment coefficient is determined by the ambient temperature and the operating time of the battery cell and the liquid cooling unit, and is obtained by the following formula:

[0054]

[0055] Among them, k represents the adjustment coefficient, c represents the ambient temperature, ε represents the rated operating temperature of the battery cell, T1 represents the service life of the battery cell, T2 represents the service life of the liquid cooling unit, t1 represents the operating time of the battery cell, and t2 represents the operating time of the liquid cooling unit.

[0056] According to a third aspect, a computer device is provided, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the computer device is running, the processor communicates with the memory via the bus, and when the machine-readable instructions are executed by the processor, the steps of the liquid cooling unit control method described in the first aspect or in combination with any possible implementation of the first aspect are performed.

[0057] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the liquid cooling unit control method as described in the first aspect or in combination with any possible implementation of the first aspect are executed.

[0058] The beneficial effects of the embodiments of the present disclosure include:

[0059] The disclosed embodiment provides a liquid cooling unit control method and device, which is applied to control the liquid cooling unit based on the battery cell temperature before the liquid cooling energy storage system is charged and discharged. Before the energy storage system is charged and discharged, the battery cell temperature of the battery in the energy storage system is monitored in real time, so that the abnormal battery cell temperature can be discovered and handled in time; then, based on the battery cell temperature, the corresponding working mode of the liquid cooling unit is determined, and it is judged whether the liquid cooling unit is pre-operated; when it is determined that the liquid cooling unit is pre-operated, the pre-operation time is determined according to the battery cell temperature to reduce the redundant operation time of the equipment; the liquid cooling unit is operated in the pre-operation mode according to the pre-operation time, so that the equipment can quickly adjust the operating temperature to a temperature suitable for operation during the pre-operation time, reduce power consumption, and improve the charging and discharging efficiency of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 A flow chart of a liquid cooling unit control method provided in an embodiment of the present disclosure;

[0061] Figure 2 A composition diagram of an industrial and commercial liquid cooling energy storage system provided by an embodiment of the present disclosure;

[0062] Figure 3 A structural diagram of a liquid cooling unit control device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0063] The embodiment of the present disclosure provides a liquid cooling unit control method. The preferred embodiment of the present disclosure is described below in conjunction with the drawings of the specification. It should be understood that the preferred embodiment described here is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure. In addition, the embodiments and features in the embodiments of the present application can be combined with each other if there is no conflict.

[0064] The present disclosure provides a liquid cooling unit control method, such as Figure 1 As shown, including:

[0065] S101, before the energy storage system is charged and discharged, real-time monitoring of the battery cell temperature of the energy storage system;

[0066] S102, determining the working mode of the liquid cooling unit based on the battery core temperature;

[0067] S103, when the working mode is a pre-operation mode, determining a pre-operation time of the pre-operation mode according to the battery cell temperature; and

[0068] S104, operating in a pre-operation mode according to the pre-operation time; the pre-operation mode is used to perform cooling or heating operations according to the battery cell temperature to control the battery cell temperature.

[0069] In the embodiments of the present disclosure, the above method is applied to the actual operation of the industrial and commercial energy storage system. In order to improve the charging and discharging efficiency of the system, the present invention proposes a new method for controlling the liquid cooling unit in the system. Figure 2 As shown, through the composition of the energy storage system, it can be known that the charging and discharging efficiency of the industrial and commercial energy storage system is affected by many factors, such as the charging and discharging characteristics of the battery, the ambient temperature, the operation of auxiliary equipment, etc. Among these auxiliary equipment, the power consumption of the liquid cooling unit accounts for more than 90% of the power consumption of the overall auxiliary equipment. Therefore, the operation of the liquid cooling unit has an important impact on the charging and discharging efficiency of the system. However, in the existing control scheme, there is a lot of unnecessary running time for the liquid cooling unit, so the processor of the present invention monitors the battery cell temperature in real time, and finely controls the operation of the liquid cooling unit based on the battery cell temperature, reducing unnecessary running time, thereby improving the charging and discharging efficiency of the energy storage system.

[0070] In another embodiment provided by the present disclosure, in the above step S102, “determining the working mode of the above liquid cooling unit based on the above battery core temperature” includes:

[0071] When the battery core temperature is not less than the first preset temperature or not greater than the second preset temperature, the liquid cooling unit starts the pre-operation mode;

[0072] When the battery core temperature is lower than the first preset temperature and higher than the second preset temperature, the liquid cooling unit starts the shutdown mode.

[0073] In the embodiment of the present disclosure, the operation mode of the subsequent liquid cooling unit is determined to be a pre-operation mode or a shutdown mode based on the comparison between the battery cell temperature and the first preset temperature and the second preset temperature; when the battery cell temperature monitored in real time is not within the range of the first preset temperature and the second preset temperature, the battery cell temperature needs to be adjusted, so the pre-operation mode is started so that the subsequent equipment is at a suitable operating temperature during charging and discharging; and when the battery cell temperature monitored in real time is within the range of the first preset temperature and the second preset temperature, the battery cell temperature does not need to be adjusted, so the liquid cooling unit starts the shutdown mode and does not work, thereby achieving the purpose of saving electricity and improving the overall charging and discharging efficiency of the energy storage system.

[0074] In another embodiment provided by the present disclosure, in the above step S103, “running in the above pre-running mode according to the above pre-running time” includes:

[0075] When the battery core temperature is not less than the first preset temperature, the liquid cooling unit starts the fully automatic operation mode until the battery core temperature is not greater than the third preset temperature;

[0076] When the battery core temperature is not greater than the second preset temperature, the liquid cooling unit starts the fully automatic operation mode until the battery core temperature is not less than the fourth preset temperature.

[0077] In the disclosed embodiment, in the pre-operation mode, the battery cell temperature is monitored, and the battery cell temperature is not within the interval formed by the first preset temperature and the second preset temperature. Further, when the battery cell temperature is not less than the highest temperature of the battery cell operation, that is, the first preset temperature, the liquid cooling unit starts the full-automatic operation mode, and the liquid cooling unit performs cooling to reduce the battery cell temperature until the battery cell temperature is not greater than the third preset temperature; when the battery cell temperature is not greater than the second preset temperature, the liquid cooling unit starts the full-automatic operation mode, and the liquid cooling unit performs heating to increase the battery cell temperature until the battery cell temperature is not less than the third preset temperature. By operating in the pre-operation mode according to the pre-operation time, a suitable operating temperature is provided for the battery cell. At the same time, in order to prevent the local temperature from being too high or too low due to the external environment radiation during the non-charging and discharging period, the highest and lowest temperature values ​​of the battery cell temperature are also referred to as the first preset temperature and the second preset temperature, so as to control the liquid cooling unit to start the full-automatic operation mode.

[0078] In another embodiment provided by the present disclosure, the above method further includes: the above energy storage system enters the charging and discharging period, and the liquid cooling unit starts a fully automatic operation mode.

[0079] In the disclosed embodiment, the control method of the above-mentioned liquid cooling unit not only finely controls the energy storage system before it enters the charging and discharging period, but also includes the liquid cooling unit starting the full-automatic operation mode to regulate the overall temperature in the energy storage system when the energy storage system enters the charging and discharging period. Compared with the single operation of the liquid cooling unit in the existing solution, the present invention is more refined, so that the charging and discharging efficiency of the energy storage system is higher.

[0080] In another embodiment provided by the present disclosure, the liquid cooling unit starts a fully automatic operation mode, including:

[0081] When the outlet temperature of the liquid cooling unit is not less than the fifth preset temperature, the liquid cooling unit starts cooling until the outlet temperature of the liquid is not greater than the seventh preset temperature;

[0082] When the outlet temperature of the liquid cooling unit is not greater than the sixth preset temperature, the liquid cooling unit starts heating until the outlet temperature of the liquid is not less than the eighth preset temperature;

[0083] In other cases, the above liquid cooling unit does not perform cooling and heating, and the water pump operates in self-circulation.

[0084] In the disclosed embodiment, the fully automatic operation mode monitors the outlet temperature of the liquid cooling unit in real time through the processor, and promptly determines the overall condition of the energy storage system corresponding to the operation condition of the liquid cooling unit; when the outlet temperature of the liquid cooling unit is not less than the fifth preset temperature, the liquid cooling unit will start cooling, so that the overall temperature of the energy storage system decreases, until the outlet temperature of the liquid cooling unit is not greater than the seventh preset temperature; when the outlet temperature of the liquid cooling unit is not greater than the sixth preset temperature, the liquid cooling unit will start heating, so that the overall temperature of the energy storage system increases, until the outlet temperature of the liquid cooling unit is not less than the eighth preset temperature; and in cases other than the above two cases, the liquid cooling unit does not cool or heat, and the water pump runs in a self-circulating manner until the above two cases occur or the liquid cooling unit ends the charging and discharging period. The energy storage system reaches the optimal operating temperature range through the fully automatic operation mode, and the energy storage system remains within the optimal operating temperature range.

[0085] In another embodiment provided by the present disclosure, the time of the above-mentioned pre-operation is determined by the following first relationship:

[0086]

[0087] Among them, x represents the above-mentioned battery cell temperature, y represents the above-mentioned pre-operation time, the unit is minutes, k represents the adjustment coefficient, θ1 represents the battery cell cooling rate, and θ2 represents the battery cell heating rate.

[0088] In the embodiment of the present disclosure, the above first relational expression is

[0089] In another embodiment provided by the present disclosure, the pre-operation time is determined by the following second relational expression:

[0090]

[0091] Wherein, x represents the battery cell temperature, and y represents the pre-operation time.

[0092] In the embodiment of the present disclosure, for the calculation of the pre-running time, the pre-running time is determined by the above-mentioned second relationship, which sacrifices some accuracy while simplifying the operation, reducing the amount of calculation, and achieving the effect of real-time rapid response.

[0093] In another embodiment provided by the present disclosure, the above-mentioned battery cell cooling rate and the above-mentioned battery cell heating rate are determined in advance by a pre-trained neural network model, which takes the ambient temperature and the battery cell heat capacity as inputs, and the above-mentioned battery cell heating rate and the above-mentioned battery cell cooling rate as outputs, and is trained with the battery cell heating rate and the above-mentioned battery cell cooling rate corresponding to the ambient temperature and the battery cell heat capacity in pre-test data as true values.

[0094] In the disclosed embodiment, for a liquid cooling unit of a specified energy storage system, the thermal capacity of the battery cells in the energy storage system and the ambient temperature are input into a pre-trained neural network model to obtain the battery cell cooling rate and the battery cell heating rate. Since the position of the energy storage system equipment will not change substantially during the actual operation, the input of the model, i.e., the influencing factors of the battery cell cooling rate and the battery cell heating rate of the battery in the energy storage system, will not change significantly over time. Furthermore, for the liquid cooling unit of the specified energy storage system, only one application of the model is required to obtain the corresponding battery cell cooling rate and battery cell heating rate. In subsequent control operations, the battery cell cooling rate and the battery cell heating rate will not change over time, nor will they affect the calculation of the above-mentioned pre-operation time, thereby reducing the amount of calculation in the scheme and accelerating the response speed.

[0095] In another embodiment provided by the present disclosure, the adjustment coefficient is determined by the ambient temperature and the operating time of the battery cell and the liquid cooling unit, and is obtained by the following formula:

[0096]

[0097] Among them, k represents the above adjustment coefficient, c represents the above ambient temperature, ε represents the rated operating temperature of the battery cell, T1 represents the service life of the battery cell, T2 represents the service life of the liquid cooling unit, t1 represents the operating time of the battery cell, and t2 represents the operating time of the liquid cooling unit.

[0098] In the disclosed embodiment, considering the influence of the ambient temperature of the energy storage system during operation and the aging degree of the liquid cooling unit on the working effect of the liquid cooling unit, the value of the adjustment coefficient is determined by the above formula, and then the calculation of the pre-operation time is optimized using the adjustment coefficient.

[0099] In the disclosed embodiments, compared with the prior art, the present invention takes into account the impact of the operating status of the auxiliary equipment, namely the liquid cooling unit, on the system's charging and discharging efficiency. By reducing the operation of the auxiliary equipment, especially the operation during the non-charging and discharging time, the power consumption of the auxiliary equipment can be significantly reduced, thereby improving the system's charging and discharging efficiency. The liquid cooling unit control method of the present invention performs pre-operation cooling or heating before the charging and discharging period, which not only enables the system to operate in the best working state, but also further improves the system's charging and discharging efficiency. The implementation of the present invention can not only improve the charging and discharging efficiency of industrial and commercial energy storage systems, but also optimize and save energy on the operation of auxiliary equipment, reduce the operating costs of the system, and has high economic value and social benefits.

[0100] Based on the same disclosed concept, the embodiment of the present disclosure also provides a liquid cooling unit control device. Since the principle of the problem solved by the device is similar to that of the aforementioned method, the implementation of the device can refer to the implementation of the aforementioned liquid cooling unit control method, and the repeated parts will not be repeated.

[0101] With the above Figure 1 Corresponding to the liquid cooling unit control method shown, the embodiment of the present disclosure also provides a liquid cooling unit control device, such as Figure 3 As shown, including:

[0102] The temperature monitoring module 301 is used to monitor the temperature of the battery cells in the energy storage system in real time before the energy storage system is charged or discharged;

[0103] The working mode determination module 302 is used to determine the working mode of the liquid cooling unit based on the battery core temperature;

[0104] The duration determination module 303 is used to determine the pre-operation time of the pre-operation mode according to the battery cell temperature when the working mode is the pre-operation mode;

[0105] The temperature control module 304 is used to operate in the above-mentioned pre-operation mode according to the above-mentioned pre-operation time; the above-mentioned pre-operation mode is used to perform cooling or heating operations according to the above-mentioned battery cell temperature to control the battery cell temperature.

[0106] In another embodiment provided by the present disclosure, in the working mode determination module 302, determining the working mode of the liquid cooling unit based on the battery core temperature includes:

[0107] When the battery core temperature is not less than the first preset temperature or not greater than the second preset temperature, the liquid cooling unit starts the pre-operation mode;

[0108] When the battery core temperature is lower than the first preset temperature and higher than the second preset temperature, the liquid cooling unit starts the shutdown mode.

[0109] In another embodiment provided by the present disclosure, the temperature control module 304 operates in the pre-operation mode according to the pre-operation time, including:

[0110] When the battery core temperature is not less than the first preset temperature, the liquid cooling unit starts the fully automatic operation mode until the battery core temperature is not greater than the third preset temperature;

[0111] When the battery core temperature is not greater than the second preset temperature, the liquid cooling unit starts the fully automatic operation mode until the battery core temperature is not less than the fourth preset temperature.

[0112] In another embodiment provided by the present disclosure, the above-mentioned device also includes: a charging and discharging operation module, which is used to start the full-automatic operation mode of the liquid cooling unit when the above-mentioned energy storage system enters the charging and discharging period.

[0113] In another embodiment provided by the present disclosure, the liquid cooling unit starts a fully automatic operation mode, including:

[0114] When the outlet temperature of the liquid cooling unit is not less than the fifth preset temperature, the liquid cooling unit starts cooling until the outlet temperature of the liquid is not greater than the seventh preset temperature;

[0115] When the outlet temperature of the liquid cooling unit is not greater than the sixth preset temperature, the liquid cooling unit starts heating until the outlet temperature of the liquid is not less than the eighth preset temperature;

[0116] In other cases, the above liquid cooling unit does not perform cooling and heating, and the water pump operates in self-circulation.

[0117] In another embodiment provided by the present disclosure, the time of the above-mentioned pre-operation is determined by the following first relationship:

[0118]

[0119] Wherein, x represents the battery cell temperature, y represents the pre-operation time in minutes, k represents the adjustment coefficient, θ1 represents the battery cell cooling rate, and θ2 represents the battery cell heating rate.

[0120] In another embodiment provided by the present disclosure, the pre-operation time is determined by the following second relational expression:

[0121]

[0122] Wherein, x represents the battery cell temperature, and y represents the pre-operation time.

[0123] In another embodiment provided by the present disclosure, the above-mentioned battery cell cooling rate and the above-mentioned battery cell heating rate are determined in advance by a pre-trained neural network model, which takes the ambient temperature and the battery cell heat capacity as inputs, and the above-mentioned battery cell heating rate and the above-mentioned battery cell cooling rate as outputs, and is trained with the battery cell heating rate and the above-mentioned battery cell cooling rate corresponding to the ambient temperature and the battery cell heat capacity in pre-test data as true values.

[0124] In another embodiment provided by the present disclosure, the adjustment coefficient is determined by the ambient temperature and the operating time of the battery cell and the liquid cooling unit, and is obtained by the following formula:

[0125]

[0126] Among them, k represents the above adjustment coefficient, c represents the above ambient temperature, ε represents the rated operating temperature of the battery cell, T1 represents the service life of the battery cell, T2 represents the service life of the liquid cooling unit, t1 represents the operating time of the battery cell, and t2 represents the operating time of the liquid cooling unit.

[0127] An embodiment of the present disclosure provides a computer device, including: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the computer device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps of the liquid cooling unit control method provided in any embodiment of the present disclosure are executed.

[0128] The computer device provided by the embodiment of the present disclosure includes a processor, a memory, and a bus. The memory is used to store execution instructions, including internal memory and external memory; the internal memory here is also called internal memory, which is used to temporarily store the operation data in the processor and the data exchanged with the external memory such as the hard disk. The processor exchanges data with the external memory through the internal memory. When the electronic device is running, the processor and the memory communicate through the bus, so that the processor executes the following instructions:

[0129] Before the energy storage system is charged and discharged, the temperature of the battery cells in the energy storage system is monitored in real time;

[0130] Based on the battery core temperature, determining the working mode of the liquid cooling unit;

[0131] In the case where the working mode is a pre-operation mode, determining a pre-operation time of the pre-operation mode according to the battery core temperature; and

[0132] The pre-operation mode is operated according to the pre-operation time; the pre-operation mode is used to perform cooling or heating operation according to the battery core temperature to control the battery core temperature.

[0133] The embodiment of the present disclosure provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the liquid cooling unit control method provided in any embodiment of the present disclosure are executed. The storage medium can be a volatile or non-volatile computer-readable storage medium.

[0134] Through the description of the above implementation methods, those skilled in the art can clearly understand that the embodiments of the present disclosure can be implemented by hardware, or by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present disclosure.

[0135] Those skilled in the art will appreciate that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes in the accompanying drawings are not necessarily required for implementing the present disclosure.

[0136] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the present embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0137] The serial numbers of the above-mentioned embodiments of the present disclosure are only for description and do not represent the advantages or disadvantages of the embodiments.

[0138] Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

1. A liquid cooling unit control method, characterized in that: include: Before the energy storage system is charged and discharged, the temperature of the battery cells in the energy storage system is monitored in real time; Based on the battery core temperature, determining the working mode of the liquid cooling unit; When the working mode is a pre-operation mode, determining a pre-operation time of the pre-operation mode according to the battery core temperature; and The pre-operation mode is operated according to the pre-operation time; the pre-operation mode is used to perform cooling or heating operations according to the battery core temperature to control the battery core temperature.

2. The method according to claim 1, characterized in that The determining the working mode of the liquid cooling unit based on the battery core temperature includes: When the temperature of the battery core is not less than the first preset temperature or not greater than the second preset temperature, the liquid cooling unit starts the pre-operation mode; When the battery core temperature is lower than the first preset temperature and higher than the second preset temperature, the liquid cooling unit starts the shutdown mode.

3. The method according to claim 1, characterized in that Running in the pre-operation mode according to the pre-operation time includes: When the battery core temperature is not less than the first preset temperature, the liquid cooling unit starts the fully automatic operation mode until the battery core temperature is not greater than the third preset temperature; When the battery core temperature is not greater than the second preset temperature, the liquid cooling unit starts the full-automatic operation mode until the battery core temperature is not less than the fourth preset temperature.

4. The method according to claim 1, characterized in that Also includes: The energy storage system enters the charging and discharging period, and the liquid cooling unit starts the fully automatic operation mode.

5. The method according to claim 3 or 4, characterized in that The liquid cooling unit starts the fully automatic operation mode, including: When the outlet temperature of the liquid cooling unit is not less than the fifth preset temperature, the liquid cooling unit starts cooling until the outlet temperature of the liquid is not greater than the seventh preset temperature; When the outlet temperature of the liquid cooling unit is not greater than the sixth preset temperature, the liquid cooling unit starts heating until the outlet temperature of the liquid is not less than the eighth preset temperature; In other cases, the liquid cooling unit does not perform cooling and heating, and the water pump operates in a self-circulating manner.

6. The method according to claim 1, characterized in that The time of the pre-run is determined by the following first relation: Among them, x represents the battery cell temperature, y represents the pre-operation time in minutes, k represents the adjustment coefficient, θ1 represents the battery cell cooling rate, and θ2 represents the battery cell heating rate.

7. The method according to claim 1, characterized in that The pre-run time is determined by the following second relationship: Wherein, x represents the battery core temperature, and y represents the pre-operation time.

8. The method according to claim 6, characterized in that The battery cell cooling rate and the battery cell heating rate are determined in advance by a pre-trained neural network model, which takes the ambient temperature and the battery cell heat capacity as inputs, and the battery cell heating rate and the battery cell cooling rate as outputs, and is trained using the battery cell heating rate and the battery cell cooling rate corresponding to the ambient temperature and the battery cell heat capacity in pre-test data as true values.

9. The method according to claim 6, characterized in that The adjustment coefficient is determined by the ambient temperature and the operating time of the battery cell and the liquid cooling unit, and is obtained by the following formula: Among them, k represents the adjustment coefficient, c represents the ambient temperature, ε represents the rated operating temperature of the battery cell, T1 represents the service life of the battery cell, T2 represents the service life of the liquid cooling unit, t1 represents the operating time of the battery cell, and t2 represents the operating time of the liquid cooling unit.

10. A liquid cooling unit control device, characterized in that: include: A temperature monitoring module is used to monitor the battery cell temperature of the energy storage system in real time before the energy storage system is charged and discharged; An operating mode determination module, used to determine the operating mode of the liquid cooling unit based on the battery core temperature; a duration determination module, configured to determine, when the working mode is a pre-operation mode, a pre-operation time of the pre-operation mode according to the battery core temperature; The temperature control module is used to operate in the pre-operation mode according to the pre-operation time; the pre-operation mode is used to perform cooling or heating operations according to the battery core temperature to control the battery core temperature.

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