Energy storage temperature control method, electronic device and energy storage system

Abstract

The application discloses an energy storage temperature control method, an electronic device and an energy storage system, and relates to the technical field of energy storage systems. The method comprises the following steps: acquiring an ambient temperature, a battery temperature parameter and a charging and discharging working condition parameter; a plurality of ambient temperature intervals are divided based on the charging and discharging working condition parameter and a preset working temperature range, and a temperature control strategy corresponding to each ambient temperature interval is set; a current ambient temperature interval is determined based on the acquired ambient temperature and the plurality of ambient temperature intervals, and the working mode of a temperature control system is controlled based on the battery temperature parameter, the charging and discharging working condition parameter and the temperature control strategy corresponding to the current ambient temperature interval. The application can effectively improve the service life and energy efficiency of the energy storage system and reduce the energy consumption of the system by using a refined temperature control strategy.

Description

Technical Field

[0001] This application relates to the field of energy storage system technology, specifically providing an energy storage temperature control method, electronic device, and energy storage system. Background Technology

[0002] Battery thermal management is crucial for the operational safety and performance of energy storage systems. Temperature control strategies significantly impact thermal management effectiveness and system energy consumption. Most existing temperature control strategies determine the cooling mode based on chiller supply liquid temperature or battery temperature parameters, aiming to maintain the battery temperature within a suitable range. However, current technology's control logic is relatively coarse, failing to specifically consider strategy differentiation based on different battery states, charging / discharging power, resting time, ambient temperature range, and supply liquid temperature. For example, battery states are categorized as charging, discharging, and resting, and strategy differentiation includes distinctions between chiller operating modes and start / stop thresholds.

[0003] Therefore, the purpose of this application is to provide an efficient and precise energy storage temperature control solution. Summary of the Invention

[0004] This application aims to solve the above-mentioned technical problems, namely, the refined energy storage temperature control method, electronic equipment and energy storage system provided by this application can solve the problems of coarse control logic, poor control accuracy and high energy consumption of energy storage equipment in the prior art.

[0005] In a first aspect, this application provides an energy storage temperature control method applied to an energy storage system, the energy storage system including a temperature control system, the method comprising: Step S11: Obtain ambient temperature, battery temperature parameters, and charge / discharge condition parameters; Step S12: Based on the charging and discharging operating parameters and the preset operating temperature range, multiple ambient temperature ranges are obtained, and a corresponding temperature control strategy is set for each ambient temperature range. Step S13: Determine the current ambient temperature range based on the acquired ambient temperature and the multiple ambient temperature ranges, and control the working mode of the temperature control system based on the battery temperature parameters, the charge and discharge condition parameters and the temperature control strategy corresponding to the current ambient temperature range.

[0006] Further, the charge / discharge operating condition parameters include charge / discharge power. Step S12, which involves dividing the system operating temperature range into multiple ambient temperature intervals based on the charge / discharge operating condition parameters and the preset system operating temperature range, includes: dividing the preset operating temperature range into multiple ambient temperature intervals based on the charge / discharge power. Each of the multiple ambient temperature intervals includes at least a first ambient temperature interval reflecting a low-temperature range and a second ambient temperature interval reflecting a high-temperature range. The upper limit of the first ambient temperature interval corresponding to a higher charge / discharge power is less than the upper limit of the first ambient temperature interval corresponding to a lower charge / discharge power, and the lower limit of the second ambient temperature interval corresponding to a higher charge / discharge power is less than the lower limit of the second ambient temperature interval corresponding to a lower charge / discharge power.

[0007] In some technical solutions, the step S12 of setting a corresponding temperature control strategy for each ambient temperature range includes: setting a first set of temperature control parameters corresponding to the charging state and a second set of temperature control parameters corresponding to the discharging state for each ambient temperature range.

[0008] Furthermore, the charge / discharge operating condition parameters include an operating condition status identifier. Step S13, which involves controlling the operating mode of the temperature control system based on the battery temperature parameters, the charge / discharge operating condition parameters, and the temperature control strategy corresponding to the current ambient temperature range, includes: The current operating status of the system is determined based on the operating status identifier; If the battery is in a charging state, the temperature control system is controlled to execute the corresponding working mode according to the battery temperature parameters and the first set of temperature control parameters. If the battery is in a discharge state, the temperature control system will be controlled to execute the corresponding working mode according to the battery temperature parameters and the set second set of temperature control parameters.

[0009] Further, the battery temperature parameters include the battery's maximum temperature, minimum temperature, and average temperature. Both the first set of temperature control parameters and the second set of temperature control parameters include a target liquid supply temperature for cooling mode, a target liquid supply temperature for heating mode, a cooling start / stop threshold, and a heating start / stop threshold. The step of controlling the temperature control system to execute a corresponding operating mode based on the battery temperature parameters and the set first set of temperature control parameters, or the step of controlling the temperature control system to execute a corresponding operating mode based on the battery temperature parameters and the set second set of temperature control parameters, includes: The maximum battery temperature, minimum battery temperature, and average battery temperature are compared with the cooling start-stop threshold and the heating start-stop threshold to determine whether the cooling or heating conditions are met. If the cooling conditions are met, the temperature control system will execute the cooling mode based on the liquid supply temperature threshold of the cooling mode. If the heating conditions are met, the temperature control system will execute the heating mode based on the liquid supply temperature threshold of the heating mode. If none of the conditions are met, the temperature control system will be controlled to execute a self-circulation mode.

[0010] In some technical solutions, the step S12, which involves setting a corresponding temperature control strategy for each ambient temperature range, further includes setting a third set of temperature control parameters corresponding to the static state for each ambient temperature range. The charge / discharge operating condition parameters also include the resting time. The step S13, which controls the working mode of the temperature control system based on the battery temperature parameters, the charge / discharge operating condition parameters, and the temperature control strategy corresponding to the current ambient temperature range, further includes: when the current operating state of the system is determined to be a resting state according to the operating condition status identifier, the temperature control system is controlled to execute the corresponding working mode according to the resting time, the battery temperature parameters, and the set third set of temperature control parameters.

[0011] Furthermore, the battery temperature parameters include the highest battery temperature, the lowest battery temperature, the average battery temperature, and the battery temperature difference. The third set of temperature control parameters includes the target liquid supply temperature for cooling mode, the target liquid supply temperature for heating mode, the cooling start / stop threshold, the heating start / stop threshold, the battery temperature difference threshold, the resting time threshold, and the liquid supply temperature threshold for the liquid chiller unit. The step of controlling the temperature control system to execute the corresponding working mode based on the resting time, the battery temperature parameters, and the set third set of temperature control parameters includes: Step a: By comparing the resting time with the resting time threshold, it is determined whether the standby conditions are met. If so, the temperature control system is controlled to enter standby mode; otherwise, step b is executed. Step b: By comparing the battery's highest temperature, lowest temperature, and average temperature with the cooling start / stop threshold and heating start / stop threshold, it is determined whether the cooling or heating conditions are met. If the cooling conditions are met, the temperature control system is controlled to execute the cooling mode based on the target liquid supply temperature of the cooling mode. If the heating conditions are met, the temperature control system is controlled to execute the heating mode based on the target liquid supply temperature of the heating mode. If neither condition is met, proceed to step c. Step c: Determine whether the self-circulation condition or standby condition is met based on the battery temperature difference, battery temperature difference threshold, and liquid cooling unit liquid supply temperature threshold. If the self-circulation condition is met, enter the self-circulation mode; if the standby condition is met, enter the standby mode.

[0012] Furthermore, the cooling start / stop threshold includes a cooling start threshold and a cooling stop threshold, and the heating start / stop threshold includes a heating start threshold and a heating stop threshold. The step of comparing the battery's highest temperature, lowest temperature, and average temperature with the cooling start / stop threshold and the heating start / stop threshold to determine whether cooling or heating conditions are met includes: when the battery's highest temperature and average temperature are greater than or equal to the cooling start threshold but not less than or equal to the cooling stop threshold, it is determined that cooling conditions are met; when the battery's lowest temperature and average temperature are less than or equal to the heating start threshold but not greater than or equal to the heating stop threshold, it is determined that heating conditions are met.

[0013] In some technical solutions, the third set of temperature control parameters also includes an ambient temperature threshold. Before step a, the solution further includes: determining whether the obtained ambient temperature is greater than the ambient temperature threshold. If yes, step b is executed; otherwise, step a is executed.

[0014] Further, the battery temperature difference threshold includes a first temperature difference threshold and a second temperature difference threshold, and the liquid cooler unit liquid supply temperature threshold includes a first liquid supply temperature threshold and a second liquid supply temperature threshold. Step c, determining whether the self-circulation condition or standby condition is met based on the battery temperature difference, the battery temperature difference threshold, and the unit liquid supply temperature threshold, includes: When the battery temperature difference is greater than or equal to the first temperature difference threshold or the current liquid supply temperature of the liquid cooler unit is less than or equal to the first liquid supply temperature threshold, it is determined that the self-circulation condition is met. When the battery temperature difference is not greater than or equal to the first temperature difference threshold and the current liquid supply temperature of the liquid cooling unit is not less than or equal to the first liquid supply temperature threshold, it is determined that the standby condition is met; or, when the battery temperature difference is less than or equal to the second temperature difference threshold and the current liquid supply temperature of the liquid cooling unit is greater than or equal to the second liquid supply temperature threshold, it is determined that the standby condition is met.

[0015] In a second aspect, this application provides an electronic device including at least one processor and at least one memory, the memory being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the energy storage temperature control method described in any of the above technical solutions.

[0016] In a third aspect, this application provides an energy storage system, including a battery management system and a temperature control system, wherein the battery management system includes the aforementioned electronic equipment.

[0017] By adopting the above technical solution, this application can achieve the following beneficial effects: The energy storage temperature control solution provided by this application divides the ambient temperature range based on the charging and discharging power and sets temperature control strategies for different ambient temperature ranges, realizing the thermal management of the energy storage system based on ambient temperature strategy differentiation, avoiding cooling redundancy at low ambient temperatures, and reducing the power consumption of the auxiliary system; the working mode control logic of the temperature control system based on battery status, charging and discharging power, resting time, ambient temperature range and liquid supply temperature realizes the refined thermal management of the energy storage system; based on the refined temperature control strategy provided by this application, the temperature rise and temperature difference can be optimized, the lifespan and energy efficiency of the energy storage system can be improved, and the system energy consumption can be reduced. Attached Figure Description

[0018] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein: Figure 1 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the main steps of an energy storage temperature control method provided in an embodiment of this application; Figure 3 This is a schematic diagram of the control logic implementation process designed for the charging state in the energy storage temperature control method provided in this application; Figure 4 This is a schematic diagram of the control logic implementation process designed for the discharge state in the energy storage temperature control method provided in this application; Figure 5 This is a schematic diagram of the control logic implementation process designed for a static state in the energy storage temperature control method provided in this application. Detailed Implementation

[0019] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0020] In the description of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and can also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0021] This application provides an energy storage temperature control method applied to an energy storage system. The energy storage system includes a temperature control system, which may include at least a liquid-cooled chiller unit. In practical applications, the temperature control system may also include an air-cooled chiller unit. For example, as shown... Figure 1 The illustration shows an energy storage system provided in an embodiment of this application. The energy storage system includes energy storage devices and a temperature control system. The energy storage devices include a battery pack and a battery management system (BMS). It should be understood that the energy storage system may also include a power storage converter (PCS), an energy management system (EMS), and other auxiliary systems (fire protection, power distribution, etc.). Figure 1 The components shown are merely illustrative examples related to the energy storage temperature control method provided in this application.

[0022] like Figure 2 The diagram shown is a flowchart illustrating the main implementation steps of an energy storage temperature control method provided in this application embodiment. Taking the BMS in the energy storage system as the main body of the method execution as an example, the energy storage temperature control method provided in this application embodiment mainly includes the following steps S11 to S13.

[0023] Step S11: Obtain ambient temperature, battery temperature parameters, and charge / discharge condition parameters; In practical applications, energy storage systems typically exist in the form of energy storage compartments. In this embodiment, the ambient temperature can be the ambient temperature outside the energy storage compartment collected by the BMS based on temperature sensors. The battery temperature parameters and charge / discharge condition parameters can be real-time data collected by the BMS directly from the battery pack equipment during the operation of the energy storage system.

[0024] In this embodiment, the battery temperature parameters may include the battery's maximum temperature, minimum temperature, average temperature, and temperature difference. For example, a battery pack device may contain 100 battery groups. The BMS can obtain the battery's maximum temperature, minimum temperature, average temperature, and temperature difference based on the acquired temperature data of the 100 battery groups. The battery temperature difference can be obtained by calculating the difference between the battery's maximum temperature and minimum temperature.

[0025] The charging and discharging operating parameters may include an operating condition status identifier, charging and discharging power, and resting time. For example, the operating condition status identifier can be used to characterize whether the system is currently in a charging state, a discharging state, or a resting state.

[0026] Step S12: Based on the charging and discharging operating parameters and the preset operating temperature range, multiple ambient temperature ranges are obtained, and a corresponding temperature control strategy is set for each ambient temperature range. In this embodiment, the preset operating temperature range refers to the operating temperature range of the energy storage system, which is related to the actual application environment of the energy storage system. For example, when the operating temperature range of the system is -35℃ to 55℃, it can usually be divided into three intervals to characterize the ambient temperature. In this embodiment, the ambient temperature range is specifically divided in conjunction with the charging and discharging operating parameters. For example, when the charging and discharging power is low, the battery heat generation is low, and the low temperature range can be appropriately widened while the high temperature range is narrowed.

[0027] In one specific embodiment, the step of dividing the ambient temperature range based on the charge / discharge operating parameters and the preset system operating temperature range includes: dividing the preset operating temperature range into multiple ambient temperature ranges based on the charge / discharge power. The multiple ambient temperature ranges include at least a first ambient temperature range reflecting a low-temperature range and a second ambient temperature range reflecting a high-temperature range. Furthermore, the upper limit of the first ambient temperature range corresponding to a higher charge / discharge power is less than the upper limit of the first ambient temperature range corresponding to a lower charge / discharge power, and the lower limit of the second ambient temperature range corresponding to a higher charge / discharge power is less than the lower limit of the second ambient temperature range corresponding to a lower charge / discharge power.

[0028] For example, when the system's operating temperature range is -35℃ to 55℃ and the charging / discharging power is 0.3P to 0.5P, the ambient temperature range can be divided into range 1 (-35℃ to 0℃), range 2 (0℃ to 30℃), and range 3 (30℃ to 55℃); when the system's operating temperature range is -35℃ to 55℃ and the charging / discharging power is 0.1P to 0.3P, the ambient temperature range can be divided into range 1 (-35℃ to 10℃), range 2 (10℃ to 40℃), and range 3 (40℃ to 55℃); wherein range 1 corresponds to the first ambient temperature range, and range 3 corresponds to the second ambient temperature range. This method of dividing the ambient temperature range enables temperature-based strategy differentiation, avoids cooling redundancy at low ambient temperatures, and thus reduces the system's auxiliary power consumption.

[0029] In one embodiment, the step of setting a corresponding temperature control strategy for each ambient temperature range may include: setting a first set of temperature control parameters corresponding to the charging state and a second set of temperature control parameters corresponding to the discharging state for each ambient temperature range.

[0030] In one embodiment, the step of setting a corresponding temperature control strategy for each ambient temperature range may include: setting a first set of temperature control parameters corresponding to the charging state, a second set of temperature control parameters corresponding to the discharging state, and a third set of temperature control parameters corresponding to the stationary state for each ambient temperature range.

[0031] In this embodiment, the temperature control system adopts a liquid-cooled unit as an example. The first set of temperature control parameters and the second set of temperature control parameters may specifically include the target liquid supply temperature in cooling mode, the target liquid supply temperature in heating mode, the cooling start / stop threshold, and the heating start / stop threshold. The third set of temperature control parameters specifically includes the target liquid supply temperature in cooling mode, the target liquid supply temperature in heating mode, the cooling start / stop threshold, the heating start / stop threshold, the battery temperature difference threshold, the resting time threshold, the liquid supply temperature threshold of the liquid-cooled unit, and the ambient temperature threshold.

[0032] It should be understood that the various thresholds in the temperature control strategy and the target liquid supply temperature of the liquid chiller can be determined based on a comprehensive consideration of system energy efficiency, lifespan, safety, energy consumption, etc.

[0033] Step S13: Determine the current ambient temperature range based on the acquired ambient temperature and the multiple ambient temperature ranges, and control the working mode of the temperature control system based on the battery temperature parameters, the charge and discharge condition parameters and the temperature control strategy corresponding to the current ambient temperature range.

[0034] In this embodiment, the current ambient temperature range is determined by comparing the acquired ambient temperature with the multiple ambient temperature ranges divided in step S12. For example, if the multiple ambient temperature ranges divided in step S12 are range 1 (-35℃-10℃), range 2 (10℃-40℃), and range 3 (40-55℃), and the currently acquired ambient temperature is 5℃, then the current ambient temperature range determined in this step is range 1. This embodiment of the application can control the operating mode of the temperature control system to achieve multiple modes such as cooling mode, heating mode, self-circulation mode, and standby mode. For example, the priority of mode control can be cooling mode > heating mode > self-circulation mode > standby mode.

[0035] In one embodiment, the step of controlling the operating mode of the temperature control system based on the battery temperature parameters, the charge / discharge condition parameters, and the temperature control strategy corresponding to the current ambient temperature range may specifically include: Determine the current operating status of the system based on the operating status indicator; If the battery is in a charging state, the temperature control system is controlled to execute the corresponding working mode according to the battery temperature parameters and the first set of temperature control parameters. If the battery is in a discharge state, the temperature control system will be controlled to execute the corresponding working mode according to the battery temperature parameters and the set second set of temperature control parameters.

[0036] In one embodiment, the step of controlling the operating mode of the temperature control system based on the battery temperature parameters, the charge / discharge condition parameters, and the temperature control strategy corresponding to the current ambient temperature range may specifically include: Determine the current operating status of the system based on the operating status indicator; If the battery is in a charging state, the temperature control system will be controlled to execute the corresponding working mode according to the battery temperature parameters and the first set of temperature control parameters. If the battery is in a discharge state, the temperature control system will execute the corresponding working mode based on the battery temperature parameters and the set second set of temperature control parameters.

[0037] If the battery is in a static state, the temperature control system will execute the corresponding working mode based on the static time, battery temperature parameters, and the set third set of temperature control parameters.

[0038] The control logic used in both charging and discharging states is the same, with the main difference being the temperature control parameters. This control logic implements cooling, heating, and self-circulation modes for the liquid-cooled unit based on battery temperature and temperature control parameters. The control logic used in the idle state differs from that used in the charging and discharging states. In the idle state, it first determines whether to use natural cooling (i.e., enter standby mode) based on the idle time. If this condition is not met, it then controls the liquid-cooled unit to execute cooling, heating, and self-circulation modes based on battery temperature and temperature control parameters.

[0039] For example, the control logic used in charging or discharging states, namely, controlling the temperature control system to execute a corresponding working mode based on the battery temperature parameters and a first set of set temperature control parameters, or controlling the temperature control system to execute a corresponding working mode based on the battery temperature parameters and a second set of set temperature control parameters, may specifically include: comparing the battery's highest temperature, lowest temperature, and average temperature with cooling start / stop thresholds and heating start / stop thresholds to determine whether cooling or heating conditions are met; if cooling conditions are met, controlling the temperature control system to execute cooling mode based on the cooling mode liquid supply temperature threshold; if heating conditions are met, controlling the temperature control system to execute heating mode based on the heating mode liquid supply temperature threshold; if neither is met, controlling the temperature control system to execute self-circulation mode.

[0040] For example, the control logic used in the static state, namely, controlling the temperature control system to execute the corresponding working mode based on the static time, the battery temperature parameters, and the set third set of temperature control parameters, can specifically include the following steps a to c: Step a: Compare the settling time with the settling time threshold to determine whether the standby conditions are met. If yes, control the temperature control system to enter standby mode; otherwise, proceed to step b. Step b: By comparing the battery's highest temperature, lowest temperature, and average temperature with the cooling start / stop threshold and heating start / stop threshold, it is determined whether the cooling or heating conditions are met. If the cooling conditions are met, the temperature control system is controlled to execute the cooling mode based on the target liquid supply temperature of the cooling mode. If the heating conditions are met, the temperature control system is controlled to execute the heating mode based on the target liquid supply temperature of the heating mode. If neither condition is met, proceed to step c. Step c: Determine whether the self-circulation condition or standby condition is met based on the battery temperature difference, battery temperature difference threshold, and liquid cooling unit liquid supply temperature threshold. If the self-circulation condition is met, enter the self-circulation mode; if the standby condition is met, enter the standby mode.

[0041] Optionally, before step a, the method may further include: determining whether the obtained ambient temperature is greater than the ambient temperature threshold; if yes, then proceeding to step b; otherwise, proceeding to step a.

[0042] Further, the battery temperature difference threshold in this embodiment may include a first temperature difference threshold and a second temperature difference threshold, and the liquid cooling unit liquid supply temperature threshold may include a first liquid supply temperature threshold and a second liquid supply temperature threshold. Accordingly, the step c, which determines whether the self-circulation condition or standby condition is met based on the battery temperature difference, the battery temperature difference threshold, and the unit liquid supply temperature threshold, may specifically include: when the battery temperature difference is greater than or equal to the first temperature difference threshold or the current liquid supply temperature of the liquid cooling unit is less than or equal to the first liquid supply temperature threshold, it is determined that the self-circulation condition is met; when the battery temperature difference is not greater than or equal to the first temperature difference threshold and the current liquid supply temperature of the liquid cooling unit is not less than or equal to the first liquid supply temperature threshold, it is determined that the standby condition is met; or, when the battery temperature difference is less than or equal to the second temperature difference threshold and the current liquid supply temperature of the liquid cooling unit is greater than or equal to the second liquid supply temperature threshold, it is determined that the standby condition is met.

[0043] The specific implementation of step S13 will be described in detail below with reference to specific embodiments. Taking the current ambient temperature range determined in step S13 as the first ambient temperature range, i.e., range 1 (-35℃-0℃), as an example. The temperature control strategy for the first ambient temperature range includes temperature control parameters and control logic corresponding to the charging state, the resting state, and the discharging state, respectively. Specifically: 1) The specific control logic used corresponding to the charging state is as follows: Figure 3 As shown, the first set of temperature control parameters corresponding to the charging state includes: target liquid supply temperature for cooling mode (Tout1), target liquid supply temperature for heating mode (Tout2), cooling start / stop thresholds (Tmax1, Tavg1, Tmax2, Tavg2), and heating start / stop thresholds (Tmin1, Tavg3, Tmin2, Tavg4), where Tmax1 and Tavg1 are cooling start thresholds, Tmax2 and Tavg2 are cooling stop thresholds, Tmin1 and Tavg3 are heating start thresholds, and Tmin2 and Tavg4 are heating stop thresholds.

[0044] In practical applications, when the current ambient temperature range is determined to be the first ambient temperature range and the operating condition is charging, based on the acquired maximum battery temperature Tmax, average battery temperature Tavg, minimum battery temperature Tmin, and the set first set of temperature control parameters, the following steps are executed: Figure 3 The process shown is as follows: Step 301: Determine whether Tmax≥Tmax1 and Tavg≥Tavg1 are satisfied. If yes, enter the cooling mode and the target liquid supply temperature is Tout1, and execute step 302; otherwise, execute step 303. Step 302: Determine whether Tmax≤Tmax2 and / or Tavg≤Tavg2 are satisfied. If yes, enter the self-circulation mode; otherwise, remain in the cooling mode and the target liquid supply temperature is Tout1. Step 303: Determine whether Tmin≤Tmin1 and Tavg≤Tavg3 are satisfied. If yes, enter the heating mode and the target liquid supply temperature is Tout2, and execute step 304; otherwise, enter the self-circulation mode. Step 304: Determine whether Tmin≥Tmax2 and / or Tavg≥Tavg4 are satisfied. If yes, enter the self-circulation mode; otherwise, remain in the heating mode with the target liquid supply temperature Tout2.

[0045] It should be understood that when Tmax ≥ Tmax1 and Tavg ≥ Tavg1, the liquid chiller is controlled to start cooling at the target liquid supply temperature Tout1; when either Tmax ≤ Tmax2 or Tavg ≤ Tavg2, the liquid chiller is controlled to stop cooling. When Tmin ≤ Tmin1 and Tavg ≤ Tavg3, the liquid chiller is controlled to start heating at the target liquid supply temperature Tout2; when either Tmin ≥ Tmax2 or Tavg ≥ Tavg4, the liquid chiller is controlled to stop heating. After entering the self-loop mode, it can also be set to continue returning to step 301.

[0046] 2) The specific control logic used corresponding to the discharge state is as follows: Figure 4 As shown, the second set of temperature control parameters corresponding to the discharge state includes: target liquid supply temperature for cooling mode (Tout6), target liquid supply temperature for heating mode (Tout7), cooling start / stop thresholds (Tmax5, Tavg9, Tmax6, Tavg10), and heating start / stop thresholds (Tmin5, Tavg11, Tmin6, Tavg12); where Tmax5 and Tavg9 are cooling start thresholds, Tmax6 and Tavg10 are cooling stop thresholds, Tmin5 and Tavg11 are heating start thresholds, and Tmin6 and Tavg12 are heating stop thresholds.

[0047] In practical applications, when the current ambient temperature range is determined to be the first ambient temperature range and the operating condition is discharge, based on the acquired maximum battery temperature Tmax, average battery temperature Tavg, minimum battery temperature Tmin, and the set second set of temperature control parameters, the following steps are executed: Figure 4 The process shown is as follows: Step 401: Determine whether Tmax≥Tmax5 and Tavg≥Tavg9 are satisfied. If yes, enter the cooling mode and the target liquid supply temperature is Tout6, and execute step 402; otherwise, execute step 403. Step 402: Determine whether Tmax≤Tmax6 and / or Tavg≤Tavg10 are satisfied. If yes, enter the self-circulation mode; otherwise, remain in the cooling mode and the target liquid supply temperature is Tout6. Step 403: Determine whether Tmin≤Tmin5 and Tavg≤Tavg11 are satisfied. If yes, enter the heating mode and the target liquid supply temperature is Tout7, and execute step 404; otherwise, enter the self-circulation mode. Step 404: Determine whether Tmin≥Tmax6 and / or Tavg≥Tavg12 are satisfied. If yes, enter the self-circulation mode; otherwise, remain in the heating mode and the target liquid supply temperature is Tout7.

[0048] Similarly, when Tmax ≥ Tmax5 and Tavg ≥ Tavg9, the liquid chiller is controlled to start cooling at the target liquid supply temperature Tout6; when Tmax ≤ Tmax6 and Tavg ≤ Tavg10, the liquid chiller is controlled to stop cooling. When Tmin ≤ Tmin5 and Tavg ≤ Tavg11, the liquid chiller is controlled to start heating at the target liquid supply temperature Tout7; when Tmin ≥ Tmax6 and Tavg ≥ Tavg12, the liquid chiller is controlled to stop heating. After entering the self-loop mode, it can also be set to continue returning to step 401.

[0049] 3) The specific control logic used for the static state is as follows: Figure 5 As shown, the third set of temperature control parameters corresponding to the static state includes: target liquid supply temperature for cooling mode (Tout3), target liquid supply temperature for heating mode (Tout4), cooling start / stop thresholds (Tmax3, Tavg5, Tmax4, Tavg6), heating start / stop thresholds (Tmin3, Tavg7, Tmin4, Tavg8), battery temperature difference thresholds (Td1, Td2), static time threshold (ts1), liquid cooler unit liquid supply temperature thresholds (Tout5, Tout8), and ambient temperature threshold (Tamb1). Among these, Tmax3 and Tavg5 are cooling start thresholds, Tmax4 and Tavg6 are cooling stop thresholds, Tmin3 and Tavg7 are heating start thresholds, Tmin4 and Tavg8 are heating stop thresholds, Td1 is the first temperature difference threshold, Td2 is the second temperature difference threshold, Tout5 is the first liquid supply temperature threshold, and Tout8 is the second liquid supply temperature threshold.

[0050] In practical applications, when the current ambient temperature range is determined to be the first ambient temperature range and the operating condition is a static state, based on the acquired battery maximum temperature Tmax, battery average temperature Tavg, battery minimum temperature Tmin, battery temperature difference Td, static time ts, ambient temperature Tamb, and the set third set of temperature control parameters, as well as the liquid supply temperature Tout of the liquid cooler unit that can be obtained in real time, the following steps are executed: Figure 5 The process shown is as follows: Step 501: Determine whether Tamb≤Tamb1 is satisfied. If yes, proceed to step 502; otherwise, proceed to step 503. Step 502: Determine whether ts≥ts1 is satisfied. If yes, enter standby mode; otherwise, proceed to step 503. Step 503: Determine whether Tmax≥Tmax3 and Tavg≥Tavg5 are satisfied. If yes, enter the cooling mode and the target liquid supply temperature is Tout3. Then execute step 504. Otherwise, execute step 505. Step 504: Determine whether Tmax≤Tmax4 and / or Tavg≤Tavg6 are satisfied. If yes, return to step 503; otherwise, remain in the cooling mode and the target liquid supply temperature is Tout3. Step 505: Determine whether Tmin≤Tmin3 and Tavg≤Tavg7 are satisfied. If yes, enter the heating mode and the target liquid supply temperature is Tout4. Then execute step 506. Otherwise, execute step 507. Step 506: Determine whether Tmin≥Tmax4 and / or Tavg≥Tavg8 are satisfied. If yes, return to step 503; otherwise, remain in the heating mode and the target liquid supply temperature is Tout4. Step 507: Determine whether Td≥Td1 or Tout≤Tout5 is satisfied. If yes, enter the self-loop mode; otherwise, enter the standby mode.

[0051] Once in self-loop mode, it can be set to either execute step 508 or return to execute step 503.

[0052] Step 508: Determine whether Td≤Td2 and Tout≥Tout8 are satisfied. If yes, enter standby mode; otherwise, remain in self-loop mode.

[0053] It should be noted that when Td≤Td2 and Tout≥Tout8, the liquid cooling unit is in standby mode. The liquid supply temperature corresponding strategy here can avoid false alarms caused by Tout being too low due to long-term standby at low temperatures (the battery compartment has good insulation, while the liquid cooling unit compartment is connected to the environment and is easily affected by ambient temperature).

[0054] It should be understood that when Tmax ≥ Tmax3 and Tavg ≥ Tavg5, the liquid chiller is controlled to start cooling at the target liquid supply temperature of Tout3. When either Tmax ≤ Tmax4 or Tavg ≤ Tavg6 is met, the liquid chiller is controlled to stop cooling. When Tmin ≤ Tmin3 and Tavg ≤ Tavg7 is met, the liquid chiller is controlled to start heating at the target liquid supply temperature of Tout4. When either Tmin ≥ Tmax4 or Tavg ≥ Tavg8 is met, the liquid chiller is controlled to stop heating. When Td ≥ Td1 or Tout ≤ Tout5 is met, the self-circulation condition is satisfied. When Td ≥ Td1 or Tout ≤ Tout5 is not met, the standby condition is satisfied. Furthermore, when Td ≤ Td2 and Tout ≥ Tout8 is met, the standby condition is also satisfied.

[0055] For example, when the ambient temperature range is range 1 (-35℃-0℃), the corresponding target liquid supply temperatures Tout1, Tout3, and Tout6 for the cooling mode are in the range of 20-30℃, the target liquid supply temperatures Tout2, Tout4, and Tout7 for the heating mode are in the range of 25-35℃, the cooling start thresholds Tmax1, Tmax3, and Tmax5 are in the range of 28-32℃, Tavg1, Tavg5, and Tavg9 are in the range of 25-30℃, the cooling stop thresholds Tmax2, Tmax4, and Tmax6 are in the range of 26-30℃, and Tavg2, Tavg6, and Tavg10 are in the range of 23-28℃.

[0056] For example, when the ambient temperature range is range 2 (0℃-30℃), the corresponding target liquid supply temperatures Tout1, Tout3, and Tout6 for the cooling mode range from 18 to 28℃, the target liquid supply temperatures Tout2, Tout4, and Tout7 for the heating mode range from 20 to 30℃, the cooling start thresholds Tmax1, Tmax3, and Tmax5 range from 26 to 30℃, Tavg1, Tavg5, and Tavg9 range from 23 to 28℃, the cooling stop thresholds Tmax2, Tmax4, and Tmax6 range from 24 to 28℃, and Tavg2, Tavg6, and Tavg10 range from 21 to 26℃.

[0057] For example, when the ambient temperature range is range 3 (30℃-55℃), the corresponding target liquid supply temperatures Tout1, Tout3, and Tout6 for the cooling mode are in the range of 15-25℃, the cooling start thresholds Tmax1, Tmax3, and Tmax5 are in the range of 24-28℃, Tavg1, Tavg5, and Tavg9 are in the range of 21-26℃, the cooling stop thresholds Tmax2, Tmax4, and Tmax6 are in the range of 22-26℃, and Tavg2, Tavg6, and Tavg10 are in the range of 19-24℃.

[0058] For example, the heating start-up thresholds Tmin1, Tmin3, and Tmin5 for different ambient temperature ranges are all in the range of 15-20℃, Tavg3, Tavg7, and Tavg11 are all in the range of 17-22℃, the heating stop thresholds Tmin2, Tmin4, and Tmin6 are all in the range of 17-22℃, Tavg4, Tavg8, and Tavg12 are in the range of 19-24℃, the ambient temperature threshold Tamb1 is in the range of -20-10℃, the resting time threshold ts1 is in the range of 5-10h, the battery temperature difference threshold Td1 is in the range of 4-9℃, Td2 is in the range of 2-7℃, the liquid cooler unit liquid supply temperature threshold Tout5 is in the range of -10-5℃, and Tout8 is in the range of -5-10℃.

[0059] Optionally, in the embodiments provided in this application, in order to avoid the large temperature difference between Tout and the coolant in the battery compartment due to long-term standby affecting the execution of the strategy, the control logic can also be set to start the self-circulation mode before the unit cools / heats.

[0060] Those skilled in the art will understand that all or part of the processes in the methods of any of the above embodiments of this application can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0061] Furthermore, this application also provides an electronic device. In one embodiment of the electronic device according to this application, the electronic device includes a processor and a memory. The memory can be configured to store a computer program that performs the energy storage temperature control method of the above-described method embodiments, and the processor can be configured to execute the program in the memory, which includes, but is not limited to, a program that performs the energy storage temperature control method of the above-described method embodiments. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application.

[0062] Furthermore, this application also provides an energy storage system. In one embodiment of an energy storage system according to this application, the energy storage system includes a battery management system and a temperature control system, wherein the battery management system includes the aforementioned electronic equipment. For example, the temperature control system includes a liquid cooling unit, the electronic equipment may be an MCU, and the battery management system integrates the energy storage temperature control method provided in the embodiments of this application based on the MCU.

[0063] In some possible embodiments of this application, the electronic device may include multiple processors and multiple memories. The program executing the energy storage temperature control method of the above method embodiments can be divided into multiple subroutines, each of which can be loaded and run by a processor to perform different steps of the energy storage temperature control method of the above method embodiments. Specifically, each subroutine can be stored in a different memory, and each processor can be configured to execute programs in one or more memories to jointly implement the energy storage temperature control method of the above method embodiments; that is, each processor executes different steps of the energy storage temperature control method of the above method embodiments to jointly implement the energy storage temperature control method of the above method embodiments.

[0064] Furthermore, this application also provides a computer-readable storage medium. In one embodiment of the computer-readable storage medium according to this application, the computer-readable storage medium can be configured to store a program that performs the energy storage temperature control method of the above-described method embodiments. This program can be loaded and run by a processor to implement the above-described energy storage temperature control method. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The computer-readable storage medium can be a storage device device comprising various electronic devices. Optionally, in the embodiments of this application, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0065] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. An energy storage temperature control method, applied to an energy storage system, characterized in that, The energy storage system includes a temperature control system, and the method includes: Step S11: Obtain ambient temperature, battery temperature parameters, and charge / discharge condition parameters; the charge / discharge condition parameters include charge / discharge power; Step S12: Based on the charging and discharging power, the preset operating temperature range is divided into multiple ambient temperature zones, and a corresponding temperature control strategy is set for each ambient temperature zone; the temperature control strategy includes set temperature control parameters corresponding to different operating conditions. Step S13: Determine the current ambient temperature range based on the acquired ambient temperature and the multiple ambient temperature ranges, and control the working mode of the temperature control system based on the battery temperature parameters, the charging and discharging condition parameters and the temperature control strategy corresponding to the current ambient temperature range; The method of controlling the working mode of the temperature control system based on the battery temperature parameters, the charge and discharge condition parameters and the temperature control strategy corresponding to the current ambient temperature range includes: determining the current operating state of the system according to the charge and discharge condition parameters, and controlling the temperature control system to execute the corresponding working mode according to the battery temperature parameters and the set temperature control parameters corresponding to the current operating state. The plurality of ambient temperature ranges include at least a first ambient temperature range for reflecting the low temperature range and a second ambient temperature range for reflecting the high temperature range. The upper limit of the first ambient temperature range corresponding to the higher charging and discharging power is less than the upper limit of the first ambient temperature range corresponding to the lower charging and discharging power, and the lower limit of the second ambient temperature range corresponding to the higher charging and discharging power is less than the lower limit of the second ambient temperature range corresponding to the lower charging and discharging power.

2. The energy storage temperature control method according to claim 1, characterized in that, Step S12, which involves setting a corresponding temperature control strategy for each ambient temperature range, includes setting a first set of temperature control parameters corresponding to the charging state and a second set of temperature control parameters corresponding to the discharging state for each ambient temperature range.

3. The energy storage temperature control method according to claim 2, characterized in that, The charging and discharging operating condition parameters include an operating condition status identifier. Step S13, which involves determining the current operating state of the system based on the charging and discharging operating condition parameters and controlling the temperature control system to execute the corresponding operating mode based on the battery temperature parameters and the set temperature control parameters corresponding to the current operating state, includes: The current operating status of the system is determined based on the operating status identifier; If the battery is in a charging state, the temperature control system is controlled to execute the corresponding working mode according to the battery temperature parameters and the first set of temperature control parameters. If the battery is in a discharge state, the temperature control system will be controlled to execute the corresponding working mode according to the battery temperature parameters and the set second set of temperature control parameters.

4. The energy storage temperature control method according to claim 3, characterized in that, The battery temperature parameters include the battery's maximum temperature, minimum temperature, and average temperature. Both the first set of temperature control parameters and the second set of temperature control parameters include a target liquid supply temperature for cooling mode, a target liquid supply temperature for heating mode, a cooling start / stop threshold, and a heating start / stop threshold. The step of controlling the temperature control system to execute a corresponding operating mode based on the battery temperature parameters and the set first set of temperature control parameters, or the step of controlling the temperature control system to execute a corresponding operating mode based on the battery temperature parameters and the set second set of temperature control parameters, includes: The maximum battery temperature, minimum battery temperature, and average battery temperature are compared with the cooling start-stop threshold and the heating start-stop threshold to determine whether the cooling or heating conditions are met. If the cooling conditions are met, the temperature control system will execute the cooling mode based on the liquid supply temperature threshold of the cooling mode. If the heating conditions are met, the temperature control system will execute the heating mode based on the liquid supply temperature threshold of the heating mode. If none of the conditions are met, the temperature control system will execute a self-circulation mode.

5. The energy storage temperature control method according to claim 3, characterized in that, The step S12, which sets a corresponding temperature control strategy for each ambient temperature range, further includes: setting a third set of temperature control parameters corresponding to the static state for each ambient temperature range. The charge / discharge operating condition parameters also include the resting time. The step S13, which controls the working mode of the temperature control system based on the battery temperature parameters, the charge / discharge operating condition parameters, and the temperature control strategy corresponding to the current ambient temperature range, further includes: when the current operating state of the system is determined to be a resting state according to the operating condition status identifier, the temperature control system is controlled to execute the corresponding working mode according to the resting time, the battery temperature parameters, and the set third set of temperature control parameters.

6. The energy storage temperature control method according to claim 5, characterized in that, The battery temperature parameters include the highest battery temperature, the lowest battery temperature, the average battery temperature, and the battery temperature difference. The third set of temperature control parameters includes the target liquid supply temperature for cooling mode, the target liquid supply temperature for heating mode, the cooling start / stop threshold, the heating start / stop threshold, the battery temperature difference threshold, the resting time threshold, and the liquid supply temperature threshold for the liquid chiller unit. The step of controlling the temperature control system to execute the corresponding working mode based on the resting time, the battery temperature parameters, and the set third set of temperature control parameters includes: Step a: By comparing the resting time with the resting time threshold, it is determined whether the standby conditions are met. If so, the temperature control system is controlled to enter standby mode; otherwise, step b is executed. Step b: By comparing the battery's highest temperature, lowest temperature, and average temperature with the cooling start / stop threshold and heating start / stop threshold, it is determined whether the cooling or heating conditions are met. If the cooling conditions are met, the temperature control system is controlled to execute the cooling mode based on the target liquid supply temperature of the cooling mode. If the heating conditions are met, the temperature control system is controlled to execute the heating mode based on the target liquid supply temperature of the heating mode. If neither condition is met, proceed to step c. Step c: Determine whether the self-circulation condition or standby condition is met based on the battery temperature difference, battery temperature difference threshold, and liquid cooling unit liquid supply temperature threshold. If the self-circulation condition is met, enter the self-circulation mode; if the standby condition is met, enter the standby mode.

7. The energy storage temperature control method according to claim 4 or 6, characterized in that, The cooling start / stop thresholds include a cooling start threshold and a cooling stop threshold, and the heating start / stop thresholds include a heating start threshold and a heating stop threshold. The step of comparing the battery's highest temperature, lowest temperature, and average temperature with the cooling start / stop thresholds and heating start / stop thresholds to determine whether cooling or heating conditions are met includes: when the battery's highest temperature and average temperature are greater than or equal to the cooling start threshold but not less than or equal to the cooling stop threshold, it is determined that cooling conditions are met; when the battery's lowest temperature and average temperature are less than or equal to the heating start threshold but not greater than or equal to the heating stop threshold, it is determined that heating conditions are met.

8. The energy storage temperature control method according to claim 6, characterized in that, The third set of temperature control parameters also includes an ambient temperature threshold. Before step a, the method further includes: determining whether the acquired ambient temperature is greater than the ambient temperature threshold. If yes, step b is executed; otherwise, step a is executed.

9. The energy storage temperature control method according to claim 6, characterized in that, The battery temperature difference threshold includes a first temperature difference threshold and a second temperature difference threshold. The liquid cooling unit liquid supply temperature threshold includes a first liquid supply temperature threshold and a second liquid supply temperature threshold. Step c, which involves determining whether the self-circulation condition or standby condition is met based on the battery temperature difference, the battery temperature difference threshold, and the unit liquid supply temperature threshold, includes: When the battery temperature difference is greater than or equal to the first temperature difference threshold or the current liquid supply temperature of the liquid cooler unit is less than or equal to the first liquid supply temperature threshold, it is determined that the self-circulation condition is met. When the battery temperature difference is not greater than or equal to the first temperature difference threshold and the current liquid supply temperature of the liquid cooling unit is not less than or equal to the first liquid supply temperature threshold, it is determined that the standby condition is met; or, when the battery temperature difference is less than or equal to the second temperature difference threshold and the current liquid supply temperature of the liquid cooling unit is greater than or equal to the second liquid supply temperature threshold, it is determined that the standby condition is met.

10. An electronic device, characterized in that, include: At least one processor and at least one memory; The memory is used to store a computer program, which, when executed by the at least one processor, implements the energy storage temperature control method according to any one of claims 1 to 9.

11. An energy storage system, characterized in that, It includes a battery management system and a temperature control system, wherein the battery management system includes the electronic device as claimed in claim 10.

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