Temperature control method, energy storage equipment and storage medium

Abstract

The embodiment of the invention provides a temperature control method, energy storage equipment and a storage medium, the energy storage equipment comprises a battery module and a cooling device, the cooling device comprises a cooling medium, the cooling medium is used for controlling the temperature of the battery module, and the method comprises the following steps: dividing battery temperatures of the battery module in different stages into a plurality of temperature intervals, each temperature interval corresponds to the liquid outlet temperature of different cooling media; acquiring a first battery temperature of the battery module; determining a first temperature interval corresponding to the first battery temperature and a first liquid outlet temperature of a cooling medium corresponding to the first temperature interval; and adjusting the battery temperature of the battery module from the first battery temperature to the target temperature interval based on the first liquid outlet temperature. The battery temperature in different stages is dynamically adjusted through the liquid outlet temperatures of different cooling media, and the charging and discharging efficiency of the battery module is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly relates to a temperature control method, an energy storage device, and a storage medium. Background Art

[0002] Currently, energy storage devices such as energy storage outdoor cabinets or containers widely use lithium-ion batteries, sodium-ion batteries, or chemical ion batteries of other ions as battery modules. During the charging and discharging process of the battery modules, cooling or heating of the battery modules is achieved through cooling media at different temperatures, and the outlet temperature of the cooling media has a great influence on the cooling or heating effect of the battery modules.

[0003] In related technologies, the outlet temperature of the cooling medium is kept stable under each refrigeration or heating condition to cool or heat the battery modules. However, the heat generation of the energy storage device fluctuates during different working stages, resulting in different requirements for the outlet temperature of the cooling medium by the battery modules. If the same outlet temperature of the cooling medium is used to adjust the temperature of the battery modules under large or small refrigeration demands, it will increase the energy consumption of the energy storage device and affect the charging and discharging efficiency of the battery modules. Summary of the Invention

[0004] The embodiments of the present application provide a temperature control method, an energy storage device, and a storage medium, which improve the charging and discharging efficiency of the battery modules.

[0005] In a first aspect, the embodiments of the present application provide a temperature control method, which is applied to an energy storage device. The energy storage device includes a battery module and a cooling device. The cooling device includes a cooling medium, and the cooling medium is used to control the temperature of the battery module. The method includes:

[0006] Dividing the battery temperatures of the battery module at different stages into multiple temperature intervals, and corresponding different outlet temperatures of the cooling medium to each temperature interval;

[0007] Obtaining a first battery temperature of the battery module;

[0008] Determining a first temperature interval corresponding to the first battery temperature and a first outlet temperature of the cooling medium corresponding to the first temperature interval;

[0009] Adjusting the battery temperature of the battery module from the first battery temperature to within a target temperature interval based on the first outlet temperature.

[0010] Optionally, in some embodiments of the present application, dividing the battery temperatures of the battery module at different stages into multiple temperature intervals includes:

[0011] If the energy storage device is in a refrigeration stage, controlling the outlet temperature and flow rate of the cooling medium to remain stable, and obtaining a first curve of the battery temperature of the battery module changing with time;

[0012] Based on the first curve, determine the first temperature change rate, the initial cooling battery temperature, and the maximum battery temperature of the battery module;

[0013] According to the first temperature change rate, the initial cooling battery temperature, and the maximum battery temperature, divide the battery temperature of the battery module during the cooling stage into multiple cooling temperature intervals.

[0014] Optionally, in some embodiments of the present application, divide the battery temperature of the battery module at different stages into multiple temperature intervals, including:

[0015] If the energy storage device is in the heating stage, control the outlet temperature and flow rate of the cooling medium to remain stable, and obtain the second curve of the battery temperature of the battery module changing with time;

[0016] Based on the second curve, determine the second temperature change rate, the initial heating battery temperature, and the cut-off heating battery temperature of the battery module, where the cut-off heating battery temperature corresponds to the initial cooling battery temperature;

[0017] According to the second temperature change rate, the initial heating battery temperature, and the cut-off heating battery temperature, divide the battery temperature of the battery module during the heating stage into multiple heating temperature intervals.

[0018] Optionally, in some embodiments of the present application, determining the first temperature interval corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature interval includes:

[0019] If the first battery temperature is less than the first preset temperature, control the energy storage device to enter the heating stage;

[0020] If the first battery temperature is greater than or equal to the second preset temperature and less than the first preset temperature, determine that the first battery temperature is in the first heating temperature interval, and determine the first heating outlet temperature of the cooling medium corresponding to the first heating temperature interval;

[0021] Based on the first outlet temperature, adjust the battery temperature of the battery module from the first battery temperature to within the target temperature interval, including:

[0022] Based on the first heating outlet temperature, raise the battery temperature of the battery module from the first battery temperature to be greater than or equal to the first preset temperature.

[0023] Optionally, in some embodiments of the present application, determining the first temperature interval corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature interval includes:

[0024] If the first battery temperature is less than the second preset temperature, it is determined that the first battery temperature is in the second heating temperature range, and the second heating outlet temperature of the cooling medium corresponding to the second heating temperature range is determined, where the second heating outlet temperature is greater than the first heating outlet temperature;

[0025] Adjusting the battery temperature of the battery module from the first battery temperature to within the target temperature range based on the first outlet temperature includes:

[0026] Based on the second heating outlet temperature, the battery temperature of the battery module is increased from the first battery temperature to be greater than or equal to the third preset temperature, where the third preset temperature is greater than the second preset temperature and less than the first preset temperature;

[0027] Based on the first heating outlet temperature, the battery temperature of the battery module is increased from the third preset temperature to be greater than or equal to the first preset temperature.

[0028] Optionally, in some embodiments of the present application, the method further includes:

[0029] If the first battery temperature is greater than or equal to the first preset temperature and less than the fourth preset temperature, control the energy storage device to enter the internal circulation stage.

[0030] Optionally, in some embodiments of the present application, determining the first temperature range corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature range includes:

[0031] If the first battery temperature is greater than or equal to the fourth preset temperature, control the energy storage device to enter the refrigeration stage;

[0032] If the first battery temperature is greater than or equal to the fourth preset temperature and less than the fifth preset temperature, it is determined that the first battery temperature is in the first refrigeration temperature range, and the first refrigeration outlet temperature of the cooling medium corresponding to the first refrigeration temperature range is determined;

[0033] Adjusting the battery temperature of the battery module from the first battery temperature to within the target temperature range based on the first outlet temperature includes:

[0034] Based on the first refrigeration outlet temperature, the battery temperature of the battery module is decreased from the first battery temperature to be less than the sixth preset temperature, so that the energy storage device switches from the refrigeration stage to the internal circulation stage, where the sixth preset temperature is greater than the first preset temperature and less than the fourth preset temperature.

[0035] Optionally, in some embodiments of the present application, determining the first temperature range corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature range includes:

[0036] If the first battery temperature is greater than or equal to the fifth preset temperature, it is determined that the first battery temperature is in the second refrigeration temperature range, and the second refrigeration outlet temperature of the cooling medium corresponding to the second refrigeration temperature range is determined, where the second refrigeration outlet temperature is less than the first refrigeration outlet temperature;

[0037] Adjusting the battery temperature of the battery module from the first battery temperature to within the target temperature range based on the first outlet temperature, including:

[0038] Reducing the battery temperature of the battery module from the first battery temperature to less than the seventh preset temperature based on the second refrigeration outlet temperature, where the seventh preset temperature is greater than the fourth preset temperature and less than the fifth preset temperature;

[0039] Reducing the battery temperature of the battery module from the seventh preset temperature to less than the sixth preset temperature based on the first refrigeration outlet temperature, so that the energy storage device switches from the refrigeration stage to the internal circulation stage.

[0040] In a second aspect, an embodiment of the present application provides an energy storage device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of any of the above temperature control methods are implemented.

[0041] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, where the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above temperature control methods are implemented.

[0042] An embodiment of the present application provides a temperature control method, an energy storage device, and a storage medium. The energy storage device includes a battery module and a cooling device. The cooling device includes a cooling medium, and the cooling medium is used to control the temperature of the battery module. The method includes: dividing the battery temperatures of the battery module in different stages into multiple temperature ranges, and corresponding different outlet temperatures of the cooling medium to each temperature range; obtaining the first battery temperature of the battery module; determining the first temperature range corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature range; adjusting the battery temperature of the battery module from the first battery temperature to within the target temperature range based on the first outlet temperature. The present application dynamically adjusts the battery temperatures in different stages through the outlet temperatures of different cooling media, improving the charge and discharge efficiency of the battery module. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0044] Figure 1 It is the first process schematic diagram of the temperature control method provided by the embodiments of the present application;

[0045] Figure 2 It is the second process schematic diagram of the temperature control method provided by the embodiments of the present application;

[0046] Figure 3 It is the third process schematic diagram of the temperature control method provided by the embodiments of the present application;

[0047] Figure 4 It is the structural schematic diagram of the energy storage device provided by the embodiments of the present application. Detailed implementation manners

[0048] To make the features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0049] When the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present application. On the contrary, they are only examples of the devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0050] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0051] To improve the charge and discharge efficiency of the battery module in the energy storage device, the embodiments of the present application provide a temperature control method, which will be described in detail below. It should be noted that the description order of the following embodiments does not limit the priority order of the embodiments.

[0052] Please refer to Figure 1 , Figure 1 It is a process schematic diagram of the temperature control method provided by the embodiments of the present application. The specific process of this temperature control method can be as follows:

[0053] 101. Divide the battery temperatures of the battery module at different stages into multiple temperature ranges, and correspond each temperature range to the outlet temperature of a different cooling medium; obtain the first battery temperature of the battery module.

[0054] In this embodiment, the energy storage device includes a battery module. During the charging and discharging process of the battery module, the temperature change law of the battery module is obtained. Among them, the battery module can be a lithium-ion battery module, a sodium-ion battery module, or a chemical ion battery module of other ions. The battery module can be composed of multiple battery cells in series, parallel, or series-parallel connection.

[0055] Optionally, the temperature change curve is obtained through testing or simulation. For example, according to the thermal parameters of the battery cell, the working conditions, the product thermal design scheme, and the structural scheme, through testing or simulation means, the change curve of the battery cell temperature with time T = f(t) is obtained when the inlet temperature and flow rate of the cooling medium remain stable during the working condition stage of the battery module, which reflects the process of the battery temperature changing with time in different stages such as charging or discharging.

[0056] The energy storage device includes a cooling device. The cooling device contains a cooling medium, and the cooling medium is used to control the temperature of the battery module. It should be noted that the heating power of the battery cell during the charging and discharging process of the battery module changes dynamically with the remaining power of the battery module. For example, when the heat dissipation of the battery module is large, the temperature of the battery module is too high, and a lower inlet temperature of the cooling medium needs to be matched to ensure that more heat is removed so that the battery module can work at a suitable operating temperature. For example, when the heat dissipation of the battery module is small, less heat needs to be removed, and a moderate inlet temperature of the cooling medium needs to be matched to achieve the purpose of reducing heat and energy consumption. For another example, in an extremely low-temperature working environment, the temperature of the battery module is too low. For example, before charging and discharging the battery module, the battery temperature needs to be heated to the required temperature for charging and discharging. At this time, a higher inlet temperature of the cooling medium needs to be matched to ensure that the battery module can work normally. Therefore, since the temperature of the battery module is different in different stages, if the temperature is adjusted by keeping the outlet temperature and flow rate of the cooling medium stable, it will cause waste of energy consumption and cannot meet the requirement of keeping the battery module at a suitable operating temperature. Among them, the suitable operating temperature of the lithium-ion battery module is between 20 - 35 °C, and the suitable operating temperature of the sodium-ion battery module is between 25 - 50 °C. In addition, since the process of the cooling medium releasing the cooling medium to the battery module is completed in the same energy storage device, the outlet temperature of the cooling medium releasing the cooling medium is the same as the inlet temperature of the cooling medium entering the battery module.

[0057] In some embodiments, the battery temperature of the battery module in different stages can be divided into multiple temperature intervals based on the temperature change rate and the highest temperature. Specifically, according to the obtained temperature change curve T = f(t), the change rate and the highest temperature of the battery temperature are analyzed, and the battery temperature is divided into multiple temperature intervals, that is, a multi-level controlled temperature domain, according to the different temperature change rates and the limitation of the highest temperature in the heating stage and the temperature rise range of the working condition (refrigeration stage) of the battery module.

[0058] Optionally, if the battery module is in the heating stage and the battery module is heated starting from an extremely low temperature, the heating stage can be divided into multiple heating temperature ranges, such as T -m to T -2 , T -2 to T -1 , T -1 to T 0 etc., each serving as a heating temperature range, and each heating temperature range corresponds to a temperature control domain, which is used to gradually adjust the outlet temperature of the cooling medium during the heating process of the battery module to prevent the temperature of the battery module from overshooting.

[0059] Optionally, if the battery module is in the working condition stage (refrigeration stage), the battery module is in a normal working state, and the refrigeration stage of the battery module is divided into multiple refrigeration temperature ranges according to the speed of the battery temperature rise and the temperature characteristics of different stages, such as T 0 to T 1 , T 1 to T 2 , T 2 to T 3 etc., each serving as a refrigeration temperature range, and each refrigeration temperature range corresponds to a temperature control domain. For example, the range from T 0 to T 1 is the temperature rise stage of the battery module at the initial stage of charge and discharge, the range from T 1 to T 2 is the temperature stable stage of the battery module at the middle stage of charge and discharge, and the range from T 2 to T 3 is the temperature drop stage of the battery module at the later stage of charge and discharge, etc.

[0060] In order to enable the outlet temperature of the cooling medium to be dynamically adjusted according to the temperature change of the battery module, after dividing the battery temperature of the battery module in different stages into multiple temperature ranges, different outlet temperatures of the cooling medium can be corresponding to each temperature range, so as to achieve precise control of the battery temperature, meet the refrigeration or heating requirements of different working stages, improve the energy efficiency of the energy storage device thermal management system and the charge and discharge efficiency of the battery.

[0061] Optionally, the matching process of the outlet temperature of the cooling medium when the battery module is in the refrigeration stage can be as follows: in the refrigeration stage, the battery module is in the discharge stage and generates a large amount of heat. Therefore, a lower outlet temperature of the cooling medium needs to be set to achieve a better heat dissipation effect. If the refrigeration temperature is set between 15 - 25 °C, the outlet temperature of the matching cooling medium can be gradually decreased step by step according to the battery temperature. For example, when the battery temperature is in the range from T 0 to T 1 range, the outlet temperature of the cooling medium is set to T C0; When the battery temperature is within the range of T 1 to T 2 the outlet temperature of the cooling medium decreases from T C0 to T C1 ; When the battery temperature is within the range of T 2 to T 3 the outlet temperature of the cooling medium decreases from T C1 to T C2 , and so on until the lowest refrigeration temperature T Cn is reached. Among them, T C0 is the highest refrigeration temperature, and T Cn is the lowest refrigeration temperature.

[0062] Optionally, the matching process of the outlet temperature of the cooling medium when the battery module is in the heating stage can be as follows: In the heating stage, the battery module is in the charging stage and the heat generation is small. Therefore, a higher outlet temperature of the cooling medium needs to be set to ensure that the battery can be effectively heated. If the heating temperature is set between 30 - 35°C, the outlet temperature of the matching cooling medium can be gradually decreased step by step according to the rise of the battery temperature. For example, when the battery temperature starts to rise from the extremely low temperature, when the battery temperature is within the range of T -m to T -2 i.e., the starting stage of heating, the outlet temperature of the cooling medium is set to T Hm ; as the battery temperature rises, when the battery temperature is within the range of T -2 to T -1 , the outlet temperature of the cooling medium decreases from T Hm to T H1 ; when the battery temperature is within the range of T -1 to T 0 , the outlet temperature of the cooling medium decreases from T H1 to T H0 . Among them, T Hm is the highest heating temperature, and T H0 is the lowest heating temperature. It should be noted that since the outlet temperature of the cooling medium required in the heating stage of the battery is higher than the outlet temperature of the cooling medium required in the refrigeration stage, therefore, the lowest heating temperature T H0 needs to be greater than the highest refrigeration temperature T C0 , so that in the process of the battery module from the heating stage to the refrigeration stage, the outlet temperature of the required cooling medium is in a gradually decreasing process, that is, the multiple temperature ranges of the battery module are continuous temperature ranges, and the different outlet temperatures of the cooling medium corresponding to the multiple temperature ranges are a gradually adjusted process, and the difference between the outlet temperatures corresponding to adjacent two temperature ranges is greater than 3 - 5°C.

[0063] 102. Obtain the first battery temperature of the battery module.

[0064] Obtaining the first battery temperature of the battery module is the real-time temperature of the battery module at the current moment. Specifically, the temperature signal on the surface of the battery cell or at key parts can be measured in real time by temperature sensors such as NTC thermistors and thermocouples set on the battery module. The sensor converts the obtained temperature signal into an electrical signal and transmits it to the data acquisition device. The data acquisition device reads the signal and performs processing such as filtering, noise reduction, and calibration to obtain the first battery temperature of the battery module.

[0065] 103. Determine the first temperature range corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature range.

[0066] Compare the obtained first battery temperature with multiple pre-divided temperature ranges. The multiple temperature ranges are divided based on the temperature change rules and characteristics of the battery module in different working stages. For example, in the heating stage, there are multiple heating temperature ranges such as T -m to T -2 , T -2 to T -1 , T -1 to T 0 etc. In the cooling stage, there are multiple cooling temperature ranges such as T 0 to T 1 , T 1 to T 2 , T 2 to T 3 etc. If the obtained first battery temperature is T within the range of T 0 to T 1 , then the range of T 0 to T 1 is the first temperature range; if the obtained first battery temperature is T within the range of T 1 to T 2 , then the range of T 1 to T 2 is the first temperature range.

[0067] Based on the first temperature range corresponding to the first battery temperature, determine the first outlet temperature of the cooling medium corresponding to the first temperature range, that is, according to the first temperature range, find the outlet temperature of the cooling medium set for this range.

[0068] Optionally, if the battery module is in the cooling stage, that is, the first temperature range is the cooling stage, match the corresponding outlet temperature according to the different cooling temperature ranges. For example, if the first temperature range is the range of T 0 to T 1 , then the corresponding first outlet temperature is T C0 ; if the first temperature range is the range of T 1 to T 2 , then the corresponding first outlet temperature is TC1 ; if the first temperature range is T 2 to T 3 range, the corresponding first liquid outlet temperature is T C2 . Among them, the temperature within the range of T 0 to T 1 is less than the temperature within the range of T 1 to T 2 , T C0 is greater than T C1 ; T 1 to T 2 range, the temperature within the range is less than the temperature within the range of T 2 to T 3 , T C1 is greater than T C2 , that is, the liquid outlet temperature gradually decreases as the temperature in the temperature range increases.

[0069] Optionally, if the battery module is in the heating stage, that is, the first temperature range is the heating stage, the corresponding liquid outlet temperature is matched according to different heating temperature ranges. For example, if the first temperature range is T -m to T -2 range, the corresponding first liquid outlet temperature is T Hm ; if the first temperature range is T -2 to T -1 range, the corresponding first liquid outlet temperature is T H1 ; if the first temperature range is T -1 to T 0 range, the corresponding first liquid outlet temperature is T H0 . Among them, the temperature within the range of T -m to T -2 is less than the temperature within the range of T -2 to T -1 , T Hm is greater than T H1 ; T -2 to T -1 range, the temperature within the range is less than the temperature within the range of T -1 to T 0 , T H1 is greater than T H0 , that is, the liquid outlet temperature gradually decreases as the temperature in the temperature range increases to prevent the battery temperature from overshooting at the end of the heating stage.

[0070] 104. Adjust the battery temperature of the battery module from the first battery temperature to within the target temperature range based on the first liquid outlet temperature.

[0071] Control the first liquid outlet temperature of the cooling medium according to the first battery temperature of the battery module, so as to adjust the temperature of the battery module from the first battery temperature to the target temperature range through the first liquid outlet temperature. Among them, the target temperature range can be set accordingly according to the type of the battery module. For example, if the battery module is a sodium-ion battery module, since the suitable operating temperature range of the sodium-ion battery is between 25°C and 50°C, the target temperature range can be set to 25°C - 33°C.

[0072] It can be understood that the liquid outlet temperature of the cooling medium is adjusted according to the determined first battery temperature. In the refrigeration stage, if the first battery temperature is higher than the temperature within the target temperature range, it means that the battery temperature is too high, and the liquid outlet temperature needs to be reduced so that the cooling medium can take away more heat; in the heating stage, if the first battery temperature is lower than the temperature within the target temperature range, it means that the battery temperature is too low and the battery needs to be heated, then the liquid outlet temperature is increased so that the cooling medium can provide more heat.

[0073] In some embodiments, in addition to adjusting the liquid outlet temperature, the flow rate of the cooling medium can also be adjusted to enhance or weaken the cooling effect. For example, when it is necessary to quickly reduce the battery temperature, the flow rate of the cooling medium can be increased to accelerate the transfer and dissipation of heat.

[0074] During the adjustment process, continuously monitor the real-time temperature of the battery module through a temperature sensor to obtain temperature change data. Real-time monitoring can timely detect the effect and deviation of temperature adjustment, providing a basis for subsequent control; compare the real-time monitored battery temperature with the target temperature range. If the battery temperature still does not reach the target temperature range, continue to adjust the liquid outlet temperature and flow rate of the cooling medium until the battery temperature stabilizes within the target temperature range. For example, if the battery temperature drops too fast and is lower than the lower limit of the target temperature range, the liquid outlet temperature can be appropriately increased or the flow rate can be decreased to prevent the battery temperature from being too low.

[0075] In different working stages of the battery module (such as charging, discharging, standing, etc.), the thermal characteristics and temperature requirements of the battery may change. According to the actual working state and temperature change trend of the battery, dynamically adjust the control parameters, such as the adjustment range of the liquid outlet temperature, the adjustment speed of the flow rate, etc., to adapt to the real-time needs of the battery and achieve more precise temperature control.

[0076] It should be noted that the battery module has a certain thermal inertia, and the temperature change requires a certain amount of time. During the adjustment process, considering the thermal inertia of the battery, reasonably set the change rate and amplitude of the control parameters to avoid frequent or excessive adjustments that may cause system instability or excessive battery temperature fluctuations.

[0077] As can be seen from the above, in this embodiment, the battery temperatures of the battery module at different stages are divided into multiple temperature ranges, and each temperature range corresponds to the outlet temperature of a different cooling medium; the first battery temperature of the battery module is obtained; the first temperature range corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature range are determined; based on the first outlet temperature, the battery temperature of the battery module is adjusted from the first battery temperature to within the target temperature range. In this application, the battery temperatures at different stages are dynamically adjusted by the outlet temperatures of different cooling media, realizing efficient thermal management of the battery module, ensuring that the battery module operates within a suitable working temperature range, and improving the charge and discharge efficiency of the battery module.

[0078] Please refer to Figure 2 , Figure 2 which is the second flow schematic diagram of the temperature control method provided by the embodiment of this application. As Figure 2 shown, the temperature control method of the embodiment of this application may specifically include the following steps:

[0079] 201. If the energy storage device is in the heating stage, control the outlet temperature and flow rate of the cooling medium to remain stable, and obtain the second curve of the battery temperature of the battery module changing with time.

[0080] Obtain the first curve of the battery temperature changing with time. Specifically, in the heating stage, set the outlet temperature and flow rate of the cooling medium to remain stable values to ensure consistent cooling conditions for the battery module. The battery temperature of the battery module is monitored in real time through a temperature sensor, and the temperature data changing with time is recorded to obtain the second curve of the battery temperature changing with time.

[0081] 202. Based on the second curve, determine the second temperature change rate, the initial heating battery temperature, and the cut-off heating battery temperature of the battery module, where the cut-off heating battery temperature corresponds to the initial cooling battery temperature.

[0082] Based on the second curve, determine the temperature change rate and the key temperature points. For example, based on the second curve, determine the second temperature change rate, the initial heating battery temperature, and the cut-off heating battery temperature, where the cut-off heating battery temperature corresponds to the initial cooling battery temperature, that is, when the battery temperature reaches the cut-off heating battery temperature, heating will no longer continue, and this temperature, namely the initial cooling battery temperature, is used as the starting point of the cooling stage. If the battery temperature continues to rise, the battery module enters the cooling stage.

[0083] Optionally, based on the second curve, calculate the change rate of the battery temperature at different time points, and determine the initial heating battery temperature and the cut-off heating battery temperature. Among them, the initial heating battery temperature refers to the lowest value reached by the battery temperature in the heating stage, that is, the lowest point temperature of the second curve.

[0084] 203. According to the second temperature change rate, the initial heating battery temperature, and the cut-off heating battery temperature, divide the battery temperature of the battery module in the heating stage into multiple heating temperature intervals, and each heating temperature interval corresponds to the heating outlet temperature of a different cooling medium.

[0085] Based on the temperature change rate and key temperature points, that is, according to the second temperature change rate, the initial heating battery temperature, and the cut-off heating battery temperature, divide the battery temperature of the battery module in the heating stage into multiple heating temperature intervals. Each heating temperature interval corresponds to a temperature range, such as T -m to T -2 , T -2 to T -1 , T -1 to T 0 etc. are respectively used as a heating temperature interval, and each heating temperature interval corresponds to a temperature control domain.

[0086] Optionally, if the initial heating battery temperature is T -m , and the cut-off heating battery temperature is T 0 , the temperature range from T -m to T 0 can be divided into m intervals according to different temperature change rates. For example, the interval from T -m to T -2 corresponds to a stage with a relatively fast temperature change rate, and the interval from T -2 to T -1 corresponds to a stage with a relatively slow temperature change rate, and so on, until the interval from T -1 to T 0 .

[0087] In some embodiments, different heating outlet temperatures are correspondingly set based on each heating temperature interval, that is, according to the characteristics of each heating temperature interval, the corresponding cooling medium outlet temperature is set. The higher the battery temperature in the heating stage, the lower the required outlet temperature. For example, when the battery temperature is in the interval from T -m to T -2 , the outlet temperature of the cooling medium is set to T Hm ; when the battery temperature is in the interval from T -2 to T -1 , the outlet temperature of the cooling medium gradually decreases from T Hm to T H1 ; when the battery temperature is in the interval from T -1 to T 0 , the outlet temperature of the cooling medium gradually decreases from T H1 to T H0 . Among them, T Hm is the highest heating temperature, and T H0 is the lowest heating temperature.

[0088] 204. Obtain the battery temperature of the battery module, determine the heating temperature range corresponding to the battery temperature, and the heating outlet temperature of the cooling medium corresponding to the heating temperature range.

[0089] 205. Adjust the battery temperature of the battery module to the target temperature range based on the heating outlet temperature.

[0090] Optionally, in some embodiments, the step of "obtaining the battery temperature of the battery module, determining the heating temperature range corresponding to the battery temperature, and the heating outlet temperature of the cooling medium corresponding to the heating temperature range", that is, the step of "determining the first temperature range corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature range", may specifically include:

[0091] If the first battery temperature is less than the first preset temperature, control the energy storage device to enter the heating stage;

[0092] If the first battery temperature is greater than or equal to the second preset temperature and less than the first preset temperature, determine that the first battery temperature is in the first heating temperature range, and determine the first heating outlet temperature of the cooling medium corresponding to the first heating temperature range.

[0093] For example, the first preset temperature may be 25°C, and the second preset temperature is 15°C. If the obtained first battery temperature is less than the first preset temperature of 25°C, at this time, the battery module is in a low-temperature environment. In order to meet the normal charging and discharging requirements of the battery module, it is necessary to heat the battery to a suitable temperature for charging and discharging. Therefore, control the battery module of the energy storage device to enter the heating stage; if the first battery temperature is greater than or equal to the second preset temperature of 15°C and less than the first preset temperature of 25°C, then determine that the first battery temperature is in the first heating temperature range T -1 to T 0 range, and determine that the first heating outlet temperature corresponding to the first heating temperature range T -1 to T 0 range is T H0 . Among them, T -1 is 15°C, T 0 is 25°C, T H0 is 30°C.

[0094] The step of "adjusting the battery temperature of the battery module to the target temperature range based on the heating outlet temperature", that is, "adjusting the battery temperature of the battery module from the first battery temperature to the target temperature range based on the first outlet temperature", may specifically include:

[0095] Based on the first heating outlet temperature, increase the battery temperature of the battery module from the first battery temperature to be greater than or equal to the first preset temperature.

[0096] For example, the target temperature range is 25 - 33°C. Based on the first heating outlet temperature T H0 being 30°C, the battery temperature of the battery module is increased from the first battery temperature to be greater than or equal to the first preset temperature of 25°C, so that the adjusted temperature of the battery module can meet the target temperature range, thereby enabling the battery module to operate within a suitable operating temperature range to improve the charge and discharge efficiency of the battery module.

[0097] Optionally, in some embodiments, the step of "obtaining the battery temperature of the battery module, determining the heating temperature range corresponding to the battery temperature, and the heating outlet temperature of the cooling medium corresponding to the heating temperature range", that is, the step of "determining the first temperature range corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature range", may specifically include:

[0098] If the first battery temperature is less than the second preset temperature, it is determined that the first battery temperature is in the second heating temperature range, and the second heating outlet temperature of the cooling medium corresponding to the second heating temperature range is determined, where the second heating outlet temperature is greater than the first heating outlet temperature.

[0099] For example, the second preset temperature is 15°C. If the obtained first battery temperature is less than the second preset temperature of 15°C, at this time, the battery module is in an extremely low temperature environment. In order to meet the normal charge and discharge requirements of the battery module, it is necessary to increase the outlet temperature to quickly heat the battery to a suitable temperature for charge and discharge. Therefore, it is determined that the first battery temperature is in the second heating temperature range T -2 to T -1 range, and the second heating outlet temperature corresponding to the second heating temperature range T -2 to T -1 range is determined to be T H1 . Among them, T -1 is 15°C, T -2 is 5°C, T H1 is 35°C,

[0100] T H1 is greater than T H0 .

[0101] The step of "adjusting the battery temperature of the battery module to within the target temperature range based on the heating outlet temperature", that is, "adjusting the battery temperature of the battery module from the first battery temperature to within the target temperature range based on the first outlet temperature", may specifically include:

[0102] Based on the second heating outlet temperature, the battery temperature of the battery module is increased from the first battery temperature to be greater than or equal to the third preset temperature, where the third preset temperature is greater than the second preset temperature and less than the first preset temperature;

[0103] Raise the battery temperature of the battery module from the third preset temperature to be greater than or equal to the first preset temperature based on the first heating liquid outlet temperature.

[0104] For example, the third preset temperature is 16°C, the third preset temperature is greater than the second preset temperature of 15°C and less than the first preset temperature of 25°C. Based on the second heating liquid outlet temperature T H1 being 35°C, raise the battery temperature of the battery module from the first battery temperature to be greater than or equal to the third preset temperature of 16°C. It can be understood that if the battery temperature is raised to be greater than or equal to the third preset temperature, it means that the temperature of the battery module is not in an extremely low temperature. At this time, the liquid outlet temperature can be adjusted accordingly to reduce energy consumption. Specifically, since the battery temperature is in the first heating temperature range at this time, therefore, adjust the second heating liquid outlet temperature T H1 being 35°C to the first heating liquid outlet temperature T H0 being 30°C, and raise the battery temperature from the third preset temperature of 16°C to be greater than or equal to the first preset temperature of 25°C based on the first heating liquid outlet temperature, so as to reduce energy consumption on the premise of ensuring that the battery module works within a suitable working temperature range by correspondingly adjusting the liquid outlet temperature when the battery temperature is in different temperature ranges during the heating process.

[0105] Optionally, in some embodiments, if the first battery temperature is greater than or equal to the first preset temperature and less than the fourth preset temperature, control the energy storage device to enter the internal circulation stage.

[0106] For example, the fourth preset temperature is 33°C. If the first battery temperature is greater than or equal to the first preset temperature of 25°C and less than the fourth preset temperature of 33°C, control the energy storage device to enter the internal circulation stage.

[0107] It should be noted that in the thermal management system, the internal circulation mode refers to a working mode in which the cooling medium circulates inside the system and does not exchange heat with the external environment. Specifically, in the internal circulation mode, the cooling medium circulates among components such as pipes, radiators, and pumps inside the thermal management system. The cooling medium does not pass through the external radiator or directly contact the external environment, but exchanges heat with the battery module through the internal heat exchanger of the system. During the circulation process, the cooling medium absorbs the heat generated by the battery module, and then transfers the heat to other parts through the heat exchanger, such as other parts of the cooling medium or other heat sources inside the system. The cooling medium continuously circulates inside the system, taking away the heat of the battery module to achieve the control of the battery temperature.

[0108] Optionally, in a low-temperature environment, the battery module may not require additional refrigeration, and even needs to be heated to reach the optimal working temperature. At this time, the thermal management system can enter the internal circulation mode, and maintain the temperature stability of the battery module through internal heat exchange to avoid the battery temperature being too low.

[0109] Optionally, during the startup phase of the energy storage device, the temperature of the battery module may not have reached a stable state. At this time, the thermal management system can first run the internal circulation mode to quickly balance the temperature distribution inside the battery module and prepare for the subsequent cooling or heating phase.

[0110] It should be noted that the internal circulation mode does not require heat exchange with the external environment, which reduces energy loss and improves the energy efficiency of the thermal management system. Since the cooling medium circulates inside the system, the heat exchange process is more direct, and can quickly respond to temperature changes in the battery module to achieve rapid control of the battery temperature. Moreover, in the internal circulation mode, the temperature control inside the system is more stable and is not easily affected by external environmental temperature fluctuations, which is conducive to maintaining the stable working state of the battery module.

[0111] As can be seen from the above, in this embodiment, if the energy storage device is in the heating stage, the outlet temperature and flow rate of the cooling medium are controlled to remain stable, and a second curve of the battery temperature of the battery module changing with time is obtained; based on the second curve, the second temperature change rate, the initial heating battery temperature and the cut-off heating battery temperature of the battery module are determined, wherein the cut-off heating battery temperature corresponds to the initial cooling battery temperature; according to the second temperature change rate, the initial heating battery temperature and the cut-off heating battery temperature, the battery temperature of the battery module in the heating stage is divided into a plurality of heating temperature intervals, and each heating temperature interval corresponds to a different heating outlet temperature of the cooling medium; the battery temperature of the battery module is obtained, and the heating temperature interval corresponding to the battery temperature and the heating outlet temperature of the cooling medium corresponding to the cooling temperature interval are determined; based on the heating outlet temperature, the battery temperature of the battery module is adjusted to the target temperature interval, and the battery temperature at different stages is dynamically adjusted by different outlet temperatures of the cooling medium, so as to realize efficient thermal management of the battery module, so as to ensure that the battery module operates within a suitable operating temperature range, thereby improving the charging and discharging efficiency of the battery module.

[0112] See also Figure 3 , Figure 3 : is a third flow chart of the temperature control method provided in the embodiment of the present application. Figure 3 As shown, the temperature control method of the embodiment of the present application may specifically include the following steps:

[0113] 301. If the energy storage device is in the cooling stage, the outlet temperature and flow rate of the cooling medium are controlled to remain stable, and a first curve of the battery temperature of the battery module changing with time is obtained.

[0114] A first curve of battery temperature changing over time is obtained. Specifically, in the cooling stage, the outlet temperature and flow rate of the cooling medium are set to maintain stable values ​​to ensure that the cooling conditions of the battery module are consistent, and the battery temperature of the battery module is monitored in real time by a temperature sensor, and the temperature data changing over time is recorded to obtain a first curve of battery temperature changing over time.

[0115] 302 . Determine a first temperature change rate, an initial cooling battery temperature, and a maximum battery temperature of a battery module based on a first curve.

[0116] Based on the first curve, the temperature change rate and the key temperature point are determined. For example, based on the first curve, the first temperature change rate, the initial cooling battery temperature, and the maximum battery temperature are determined.

[0117] Optionally, based on the first curve, the change rate of the battery temperature at different time points is calculated, wherein the change rate can be obtained by taking a derivative or calculating the temperature difference between adjacent time points.

[0118] Optionally, an initial cooling battery temperature is determined based on the first curve, wherein the initial cooling battery temperature refers to the battery temperature at the beginning of the cooling stage, that is, the starting point temperature of the first curve.

[0119] Optionally, the maximum battery temperature is determined based on the first curve, wherein the maximum battery temperature refers to the highest value reached by the battery temperature during the cooling stage, that is, the highest point temperature of the first curve.

[0120] 303. According to the first temperature change rate, the initial cooling battery temperature and the maximum battery temperature, the battery temperature of the battery module in the cooling stage is divided into a plurality of cooling temperature intervals, and each cooling temperature interval corresponds to a different cooling liquid outlet temperature of the cooling medium.

[0121] Based on the temperature change rate and the key temperature points, that is, based on the first temperature change rate, the initial cooling battery temperature and the maximum battery temperature, the battery temperature of the battery module in the cooling stage is divided into multiple cooling temperature intervals. Each cooling temperature interval corresponds to a temperature range, such as T 0 To T 1 , T 1 To T 2 , T 2 To T 3 Etc. are respectively regarded as a refrigeration temperature interval, and each refrigeration temperature interval corresponds to a temperature control domain.

[0122] Optionally, if the initial cooling battery temperature is T 0 The maximum battery temperature is Tn, and T can be set according to the different temperature change rates. 0 The temperature range from T to Tn is divided into n intervals. 0To T 1 The interval corresponds to the stage with faster temperature change rate, T 1 To T 2 The interval corresponds to the stage with a slower temperature change rate, and so on, until T n-1 to T n interval.

[0123] In some embodiments, different cooling liquid outlet temperatures are set for each cooling temperature range, that is, the corresponding cooling medium outlet temperature is set according to the characteristics of each cooling temperature range. The higher the battery temperature during the cooling stage, the lower the required outlet temperature is, so as to achieve a better cooling effect. For example, when the battery temperature is at T 0 To T 1 In the interval, the outlet temperature of the cooling medium is set to T C0 ; When the battery temperature is T 1 To T 2 In the interval, the outlet temperature of the cooling medium changes from T C0 Reduce to T C1 ; When the battery temperature is T 2 To T 3 In the interval, the outlet temperature of the cooling medium changes from T C1 Reduce to T C2 , and so on, until the lowest refrigeration temperature T is reached Cn Among them, T C0 is the maximum cooling temperature, T Cn This is the minimum refrigeration temperature.

[0124] 304 . Obtain the battery temperature of the battery module, and determine the refrigeration temperature range corresponding to the battery temperature and the refrigeration liquid outlet temperature of the cooling medium corresponding to the refrigeration temperature range.

[0125] 305. Adjust the battery temperature of the battery module to a target temperature range based on the cooling liquid outlet temperature.

[0126] Optionally, in some embodiments, the step of “obtaining the battery temperature of the battery module, and determining the heating temperature interval corresponding to the battery temperature and the heating liquid outlet temperature of the cooling medium corresponding to the heating temperature interval”, that is, the step of “determining the first temperature interval corresponding to the first battery temperature and the first liquid outlet temperature of the cooling medium corresponding to the first temperature interval”, may specifically include:

[0127] If the first battery temperature is greater than or equal to a fourth preset temperature, controlling the energy storage device to enter a cooling stage;

[0128] If the first battery temperature is greater than or equal to the fourth preset temperature and less than the fifth preset temperature, it is determined that the first battery temperature is in the first cooling temperature range, and a first cooling liquid outlet temperature of the cooling medium corresponding to the first cooling temperature range is determined.

[0129] For example, the fourth preset temperature is 33°C and the fifth preset temperature is 40°C. If the first battery temperature is greater than or equal to the fourth preset temperature 33°C, at this time, the battery module is in a high temperature environment. In order to prevent the high temperature from damaging the battery module, the battery needs to be cooled to a temperature suitable for charging and discharging. Therefore, the battery module of the energy storage device is controlled to enter the cooling stage; if the first battery temperature is greater than or equal to the fourth preset temperature 33°C and less than the fifth preset temperature 40°C, it is determined that the first battery temperature is in the first cooling temperature interval, and the first cooling temperature interval T is determined. 1 To T 2 The first refrigeration liquid outlet temperature corresponding to the interval is T C2 Among them, T 1 At 33°C, T 2 At 40°C, T C1 is 25℃.

[0130] The step of “adjusting the battery temperature of the battery module to within the target temperature range based on the heating liquid outlet temperature”, namely “adjusting the battery temperature of the battery module from the first battery temperature to within the target temperature range based on the first liquid outlet temperature”, may specifically include:

[0131] Based on the first refrigeration liquid outlet temperature, the battery temperature of the battery module is reduced from the first battery temperature to less than the sixth preset temperature, so that the energy storage device switches from the refrigeration stage to the internal circulation stage, wherein the sixth preset temperature is greater than the first preset temperature and less than the fourth preset temperature.

[0132] For example, the sixth preset temperature is 32° C. Based on the first refrigeration liquid outlet temperature T C2 The battery temperature of the battery module is reduced from the first battery temperature to less than the sixth preset temperature of 32°C, so that the adjusted temperature of the battery module can meet the target temperature range, so that the battery module works within a suitable operating temperature range to improve the charging and discharging efficiency of the battery module. Among them, the temperature range of the internal cycle stage is the same as the target temperature range, both of which are 25-33°C.

[0133] Optionally, in some embodiments, the step of “obtaining the battery temperature of the battery module, and determining the heating temperature interval corresponding to the battery temperature and the heating liquid outlet temperature of the cooling medium corresponding to the heating temperature interval”, that is, the step of “determining the first temperature interval corresponding to the first battery temperature and the first liquid outlet temperature of the cooling medium corresponding to the first temperature interval”, may specifically include:

[0134] If the first battery temperature is greater than or equal to the fifth preset temperature, it is determined that the first battery temperature is in a second refrigeration temperature range, and a second refrigeration liquid outlet temperature of the cooling medium corresponding to the second refrigeration temperature range is determined, wherein the second refrigeration liquid outlet temperature is less than the first refrigeration liquid outlet temperature.

[0135] For example, the fifth preset temperature is 40°C. If the obtained first battery temperature is lower than the fifth preset temperature of 40°C, at this time, the battery module is in an extremely high temperature environment. In order to meet the normal charging and discharging requirements of the battery module, it is necessary to lower the liquid outlet temperature so that the battery can be quickly cooled to a temperature suitable for charging and discharging. Therefore, it is determined that the first battery temperature is in the second cooling temperature interval T 2 To T 3 interval, and determine the second refrigeration temperature interval T 2 To T 3 The second refrigeration liquid outlet temperature corresponding to the interval is T H2 Among them, T 2 At 40°C, T 3 At 50°C, T C2 At 20℃, T C1 Greater than T C2 .

[0136] The step of “adjusting the battery temperature of the battery module to within the target temperature range based on the heating liquid outlet temperature”, namely “adjusting the battery temperature of the battery module from the first battery temperature to within the target temperature range based on the first liquid outlet temperature”, may specifically include:

[0137] Based on the second refrigeration liquid outlet temperature, lowering the battery temperature of the battery module from the first battery temperature to less than a seventh preset temperature, wherein the seventh preset temperature is greater than the fourth preset temperature and less than the fifth preset temperature;

[0138] Based on the first refrigeration liquid outlet temperature, the battery temperature of the battery module is reduced from the seventh preset temperature to less than the sixth preset temperature, so that the energy storage device switches from the refrigeration stage to the internal circulation stage.

[0139] For example, the seventh preset temperature is 39° C., which is greater than the fourth preset temperature by 33° C. and less than the fifth preset temperature by 40° C. Based on the second refrigeration liquid outlet temperature T C2 The battery temperature of the battery module is reduced from the first battery temperature to less than the seventh preset temperature of 39°C. It can be understood that if the battery temperature is reduced to less than the seventh preset temperature, it means that the temperature of the battery module is not at an extremely high temperature. At this time, the liquid outlet temperature can be adjusted accordingly to reduce energy consumption. Specifically, since the battery temperature is in the first cooling temperature range at this time, the second cooling liquid outlet temperature T C2 Adjust to the first refrigeration liquid outlet temperature T of 20℃ C1 The battery temperature is reduced from the seventh preset temperature of 39°C to less than the sixth preset temperature of 32°C based on the first cooling liquid outlet temperature. The liquid outlet temperature is adjusted accordingly when the battery temperature is in different temperature ranges during the cooling process, thereby reducing energy consumption while ensuring that the battery module is operating in a suitable operating temperature range.

[0140] As can be seen from the above, in this embodiment, if the energy storage device is in the cooling stage, the outlet temperature and flow rate of the cooling medium are controlled to remain stable, and a first curve of the battery temperature of the battery module changing with time is obtained; based on the first curve, the first temperature change rate, the initial cooling battery temperature and the maximum battery temperature of the battery module are determined; according to the first temperature change rate, the initial cooling battery temperature and the maximum battery temperature, the battery temperature of the battery module in the cooling stage is divided into multiple cooling temperature intervals, and each cooling temperature interval corresponds to a different cooling outlet temperature of the cooling medium; the battery temperature of the battery module is obtained, and the cooling temperature interval corresponding to the battery temperature and the cooling outlet temperature of the cooling medium corresponding to the cooling temperature interval are determined; based on the cooling outlet temperature, the battery temperature of the battery module is adjusted to the target temperature range, and the battery temperature at different stages is dynamically adjusted by different cooling medium outlet temperatures, so as to realize efficient thermal management of the battery module, so as to ensure that the battery module operates within a suitable operating temperature range, thereby improving the charging and discharging efficiency of the battery module.

[0141] In addition, the present application also provides an energy storage device, see Figure 4 , Figure 4 It is a schematic diagram of the structure of the energy storage device provided in the embodiment of the present application.

[0142] The energy storage device 400 may include one or more processors 401 of processing cores, one or more computer-readable storage media memories 402 and other components, wherein the processor 401 is electrically connected to the memory 402. Those skilled in the art will appreciate that Figure 4 The energy storage device structure shown in the figure does not constitute a limitation on the energy storage device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0143] The processor 401 is the control center of the energy storage device 400 and may include one or more processing cores. The processor 401 uses various interfaces and lines to connect the various parts of the entire energy storage device, and executes various functions of the energy storage device and processes data by running or calling the computer program stored in the memory 402, and calling the data stored in the memory 402, so as to control the energy storage device as a whole. Optionally, the processor 401 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 401 can integrate one or a combination of CPU, graphics processing unit (Graphics Processing Unit, GPU) and modem. Among them, the CPU mainly processes the operating system, user pages and applications; the GPU is responsible for rendering and drawing display content; the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 401, and it can be implemented separately through a communication chip.

[0144] The memory 402 can be used to store software programs and modules, and the processor 401 executes various functional applications and data processing by running the computer programs and modules stored in the memory 402. The memory 402 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, a computer program required for at least one function, etc.; the data storage area can store data created according to the use of the energy storage device, etc.

[0145] In addition, the memory 402 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory 402 may also include a memory controller to provide the processor 401 with access to the memory 402.

[0146] In the embodiment of the present application, the processor 401 in the energy storage device 400 loads instructions corresponding to the processes of one or more computer programs into the memory 402 according to the following steps, and the processor 401 runs the computer program stored in the memory 402 to implement various functions, as follows:

[0147] The battery temperature of the battery module at different stages is divided into multiple temperature intervals, and each temperature interval corresponds to a different outlet temperature of the cooling medium;

[0148] Acquire a first battery temperature of the battery module;

[0149] Determine a first temperature interval corresponding to the first battery temperature and a first liquid outlet temperature of the cooling medium corresponding to the first temperature interval;

[0150] The battery temperature of the battery module is adjusted from the first battery temperature to within the target temperature range based on the first liquid outlet temperature.

[0151] Optionally, in some embodiments of the present application, when the processor divides the battery temperature of the battery module at different stages into multiple temperature intervals, the processor specifically performs the following: if the energy storage device is in the cooling stage, the outlet temperature and flow rate of the cooling medium are controlled to remain stable, and a first curve of the battery temperature of the battery module changing with time is obtained; based on the first curve, a first temperature change rate, an initial cooling battery temperature, and a maximum battery temperature of the battery module are determined; according to the first temperature change rate, the initial cooling battery temperature, and the maximum battery temperature, the battery temperature of the battery module in the cooling stage is divided into multiple cooling temperature intervals.

[0152] Optionally, in some embodiments of the present application, when the processor divides the battery temperature of the battery module at different stages into multiple temperature intervals, it specifically performs the following: if the energy storage device is in the heating stage, the outlet temperature and flow rate of the cooling medium are controlled to remain stable, and a second curve of the battery temperature of the battery module changing with time is obtained; based on the second curve, a second temperature change rate, an initial heating battery temperature, and a cutoff heating battery temperature of the battery module are determined, wherein the cutoff heating battery temperature corresponds to the initial cooling battery temperature; according to the second temperature change rate, the initial heating battery temperature, and the cutoff heating battery temperature, the battery temperature of the battery module in the heating stage is divided into multiple heating temperature intervals.

[0153] Optionally, in some embodiments of the present application, when the processor determines the first temperature interval corresponding to the first battery temperature and the first liquid outlet temperature of the cooling medium corresponding to the first temperature interval, the processor specifically performs the following steps: if the first battery temperature is less than the first preset temperature, the energy storage device is controlled to enter the heating stage; if the first battery temperature is greater than or equal to the second preset temperature and less than the first preset temperature, the first battery temperature is determined to be in the first heating temperature interval, and the first heating liquid outlet temperature of the cooling medium corresponding to the first heating temperature interval is determined.

[0154] When the processor adjusts the battery temperature of the battery module from the first battery temperature to the target temperature range based on the first liquid outlet temperature, it specifically performs: increasing the battery temperature of the battery module from the first battery temperature to greater than or equal to the first preset temperature based on the first heating liquid outlet temperature.

[0155] Optionally, in some embodiments of the present application, when the processor determines the first temperature range corresponding to the first battery temperature and the first liquid outlet temperature of the cooling medium corresponding to the first temperature range, it specifically performs: if the first battery temperature is less than the second preset temperature, it is determined that the first battery temperature is in the second heating temperature range, and the second heating liquid outlet temperature of the cooling medium corresponding to the second heating temperature range is determined, wherein the second heating liquid outlet temperature is greater than the first heating liquid outlet temperature.

[0156] When the processor is executing to adjust the battery temperature of the battery module from the first battery temperature to the target temperature range based on the first liquid outlet temperature, it specifically executes: based on the second heating liquid outlet temperature, the battery temperature of the battery module is increased from the first battery temperature to a temperature greater than or equal to a third preset temperature, wherein the third preset temperature is greater than the second preset temperature and less than the first preset temperature; based on the first heating liquid outlet temperature, the battery temperature of the battery module is increased from the third preset temperature to a temperature greater than or equal to the first preset temperature.

[0157] Optionally, in some embodiments of the present application, the processor is further configured to execute: if the first battery temperature is greater than or equal to the first preset temperature and less than a fourth preset temperature, controlling the energy storage device to enter an internal circulation stage.

[0158] Optionally, in some embodiments of the present application, when the processor determines the first temperature interval corresponding to the first battery temperature and the first liquid outlet temperature of the cooling medium corresponding to the first temperature interval, the processor specifically performs: if the first battery temperature is greater than or equal to the fourth preset temperature, the energy storage device is controlled to enter the cooling stage; if the first battery temperature is greater than or equal to the fourth preset temperature and less than the fifth preset temperature, it is determined that the first battery temperature is in the first cooling temperature interval, and the first cooling liquid outlet temperature of the cooling medium corresponding to the first cooling temperature interval is determined.

[0159] When the processor is executing to adjust the battery temperature of the battery module from the first battery temperature to the target temperature range based on the first liquid outlet temperature, it specifically executes: based on the first refrigeration liquid outlet temperature, the battery temperature of the battery module is reduced from the first battery temperature to less than the sixth preset temperature, so that the energy storage device switches from the refrigeration stage to the internal circulation stage, wherein the sixth preset temperature is greater than the first preset temperature and less than the fourth preset temperature.

[0160] Optionally, in some embodiments of the present application, when the processor determines the first temperature range corresponding to the first battery temperature and the first liquid outlet temperature of the cooling medium corresponding to the first temperature range, it specifically performs: if the first battery temperature is greater than or equal to the fifth preset temperature, it is determined that the first battery temperature is in the second refrigeration temperature range, and the second refrigeration liquid outlet temperature of the cooling medium corresponding to the second refrigeration temperature range is determined, wherein the second refrigeration liquid outlet temperature is less than the first refrigeration liquid outlet temperature.

[0161] When the processor is executing to adjust the battery temperature of the battery module from the first battery temperature to the target temperature range based on the first liquid outlet temperature, it specifically executes: based on the second refrigeration liquid outlet temperature, the battery temperature of the battery module is reduced from the first battery temperature to less than the seventh preset temperature, wherein the seventh preset temperature is greater than the fourth preset temperature and less than the fifth preset temperature; based on the first refrigeration liquid outlet temperature, the battery temperature of the battery module is reduced from the seventh preset temperature to less than the sixth preset temperature, so that the energy storage device switches from the refrigeration stage to the internal circulation stage.

[0162] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0163] The embodiment of the present application divides the battery temperature of the battery module at different stages into multiple temperature intervals, and corresponds each temperature interval to a different outlet temperature of the cooling medium; obtains the first battery temperature of the battery module; determines the first temperature interval corresponding to the first battery temperature and the first outlet temperature of the cooling medium corresponding to the first temperature interval; and adjusts the battery temperature of the battery module from the first battery temperature to within the target temperature interval based on the first outlet temperature. The present application dynamically adjusts the battery temperature at different stages through different outlet temperatures of the cooling medium, thereby improving the charging and discharging efficiency of the battery module.

[0164] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0165] To this end, an embodiment of the present application provides a computer-readable storage medium, in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps in any temperature control method provided in the embodiment of the present application. For example, the instructions can execute the following steps:

[0166] The battery temperature of the battery module at different stages is divided into multiple temperature intervals, and each temperature interval corresponds to a different outlet liquid temperature of the cooling medium; the first battery temperature of the battery module is obtained; the first temperature interval corresponding to the first battery temperature and the first outlet liquid temperature of the cooling medium corresponding to the first temperature interval are determined; and the battery temperature of the battery module is adjusted from the first battery temperature to within the target temperature interval based on the first outlet liquid temperature.

[0167] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0168] The storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0169] Since the instructions stored in the storage medium can execute the steps in any temperature control method provided in the embodiments of the present application, the beneficial effects that can be achieved by any temperature control method provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0170] The above is a detailed introduction to a temperature control method, energy storage device and storage medium provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A temperature control method, characterized in that: Applied to an energy storage device, the energy storage device includes a battery module and a cooling device, the cooling device includes a cooling medium, and the cooling medium is used to control the temperature of the battery module. The method includes: Dividing the battery temperature of the battery module at different stages into a plurality of temperature intervals, and corresponding each temperature interval to a different outlet temperature of the cooling medium; Acquiring a first battery temperature of the battery module; Determine a first temperature interval corresponding to the first battery temperature and a first outlet temperature of the cooling medium corresponding to the first temperature interval; The battery temperature of the battery module is adjusted from the first battery temperature to within a target temperature range based on the first liquid outlet temperature.

2. The temperature control method according to claim 1, characterized in that: The dividing the battery temperature of the battery module at different stages into a plurality of temperature intervals includes: If the energy storage device is in the cooling stage, controlling the outlet temperature and flow rate of the cooling medium to remain stable, and obtaining a first curve of the battery temperature of the battery module changing with time; Based on the first curve, determining a first temperature change rate, an initial cooling battery temperature, and a maximum battery temperature of the battery module; The battery temperature of the battery module in the cooling stage is divided into a plurality of cooling temperature intervals according to the first temperature change rate, the initial cooling battery temperature, and the maximum battery temperature.

3. The temperature control method according to claim 2, characterized in that: The dividing the battery temperature of the battery module at different stages into a plurality of temperature intervals includes: If the energy storage device is in the heating stage, the outlet temperature and flow rate of the cooling medium are controlled to remain stable, and a second curve of the battery temperature of the battery module changing with time is obtained; Based on the second curve, determining a second temperature change rate of the battery module, an initial heating battery temperature, and a cutoff heating battery temperature, wherein the cutoff heating battery temperature corresponds to the initial cooling battery temperature; The battery temperature of the battery module in the heating stage is divided into a plurality of heating temperature intervals according to the second temperature change rate, the initial heating battery temperature and the cut-off heating battery temperature.

4. The temperature control method according to claim 1, characterized in that: The determining a first temperature interval corresponding to the first battery temperature and a first outlet temperature of the cooling medium corresponding to the first temperature interval includes: If the temperature of the first battery is lower than a first preset temperature, controlling the energy storage device to enter a heating stage; If the first battery temperature is greater than or equal to the second preset temperature and less than the first preset temperature, determining that the first battery temperature is in a first heating temperature range, and determining a first heating outlet temperature of the cooling medium corresponding to the first heating temperature range; The step of adjusting the battery temperature of the battery module from the first battery temperature to a target temperature range based on the first liquid outlet temperature includes: Based on the first heating liquid outlet temperature, the battery temperature of the battery module is increased from the first battery temperature to a temperature greater than or equal to the first preset temperature.

5. The temperature control method according to claim 4, characterized in that: The determining a first temperature interval corresponding to the first battery temperature and a first outlet temperature of the cooling medium corresponding to the first temperature interval includes: If the first battery temperature is lower than the second preset temperature, determining that the first battery temperature is in a second heating temperature range, and determining a second heating liquid outlet temperature of the cooling medium corresponding to the second heating temperature range, wherein the second heating liquid outlet temperature is higher than the first heating liquid outlet temperature; The step of adjusting the battery temperature of the battery module from the first battery temperature to a target temperature range based on the first liquid outlet temperature includes: Based on the second heating liquid outlet temperature, raising the battery temperature of the battery module from the first battery temperature to a temperature greater than or equal to a third preset temperature, wherein the third preset temperature is greater than the second preset temperature and less than the first preset temperature; Based on the first heating liquid outlet temperature, the battery temperature of the battery module is increased from the third preset temperature to a temperature greater than or equal to the first preset temperature.

6. The temperature control method according to claim 4, characterized in that: The method further comprises: If the first battery temperature is greater than or equal to the first preset temperature and less than a fourth preset temperature, the energy storage device is controlled to enter an internal circulation stage.

7. The temperature control method according to claim 6, characterized in that: The determining a first temperature interval corresponding to the first battery temperature and a first outlet temperature of the cooling medium corresponding to the first temperature interval includes: If the first battery temperature is greater than or equal to the fourth preset temperature, controlling the energy storage device to enter a cooling stage; If the first battery temperature is greater than or equal to the fourth preset temperature and less than the fifth preset temperature, determining that the first battery temperature is in a first cooling temperature range, and determining a first cooling liquid outlet temperature of the cooling medium corresponding to the first cooling temperature range; The step of adjusting the battery temperature of the battery module from the first battery temperature to a target temperature range based on the first liquid outlet temperature includes: Based on the first refrigeration liquid outlet temperature, the battery temperature of the battery module is reduced from the first battery temperature to less than a sixth preset temperature, so that the energy storage device switches from the refrigeration stage to the internal circulation stage, wherein the sixth preset temperature is greater than the first preset temperature and less than the fourth preset temperature.

8. The temperature control method according to claim 7, characterized in that: The determining a first temperature interval corresponding to the first battery temperature and a first outlet temperature of the cooling medium corresponding to the first temperature interval includes: If the first battery temperature is greater than or equal to the fifth preset temperature, determining that the first battery temperature is in a second refrigeration temperature range, and determining a second refrigeration liquid outlet temperature of the cooling medium corresponding to the second refrigeration temperature range, wherein the second refrigeration liquid outlet temperature is less than the first refrigeration liquid outlet temperature; The step of adjusting the battery temperature of the battery module from the first battery temperature to a target temperature range based on the first liquid outlet temperature includes: Based on the second refrigeration liquid outlet temperature, lowering the battery temperature of the battery module from the first battery temperature to less than a seventh preset temperature, wherein the seventh preset temperature is greater than the fourth preset temperature and less than the fifth preset temperature; Based on the first refrigeration liquid outlet temperature, the battery temperature of the battery module is reduced from the seventh preset temperature to less than the sixth preset temperature, so that the energy storage device switches from the refrigeration stage to the internal circulation stage.

9. An energy storage device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the temperature control method according to any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the temperature control method according to any one of claims 1 to 8 are implemented.

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