Thermal management method of energy storage system, energy storage system and electric equipment

Abstract

The invention relates to the technical field of energy storage, in particular to a thermal management method of an energy storage system, the energy storage system and electric equipment. The thermal management method of the energy storage system comprises the following steps: respectively acquiring temperature information and humidity information in the energy storage system through a temperature sensor and a humidity sensor; determining a dew point temperature according to the temperature information and the humidity information; according to the temperature information, the dew point temperature and a preset condensation critical value, whether the air conditioner starting condition of an air conditioner is met or not and whether the dehumidifier starting condition of a dehumidifier is met or not are determined; and when the air conditioner starting condition is met, the air conditioner is started to execute dehumidification treatment, and when the dehumidifier starting condition is met, the dehumidifier is started to execute dehumidification treatment. According to the embodiment of the invention, the air conditioner and the dehumidifier are controlled to be started, the difference value between the environment temperature in the liquid cooling plate and the environment temperature in the energy storage system is reduced, the dew point temperature is reduced, the condensation phenomenon in the energy storage system is avoided, and the dehumidification effect is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and in particular, to a thermal management method for an energy storage system, an energy storage system, and an electrical device. Background Art

[0002] An energy storage system is equipped with battery cells. During the charge and discharge process of the battery cells, heat is generated, causing the temperature of the battery cells to rise. If the temperature of the battery cells is not controlled, it may lead to a decrease in the efficiency of the battery cells, a reduction in lifespan, or thermal runaway. Since the natural heat dissipation of the battery cells cannot maintain the temperature within the operating range, it is necessary to set up a cooling device, such as a liquid cooling plate, to perform cooling.

[0003] Due to the temperature difference between the liquid cooling plate and the environment of the energy storage system, when the temperature of the liquid cooling plate surface is lower than the dew point temperature of the humid air, condensation will occur on the liquid cooling plate surface. If the generated condensation drips onto the electrical components, it may cause damage to the electrical components or pose a safety risk of short circuit. Therefore, it is necessary to perform thermal management on the energy storage system to achieve the effect of dehumidification. Summary of the Invention

[0004] Embodiments of the present invention provide a thermal management method for an energy storage system, an energy storage system, and an electrical device, so as to solve the problem in the prior art that condensation on the surface of the liquid cooling plate of the energy storage system causes damage to electrical components.

[0005] In a first aspect, embodiments of the present invention provide a thermal management method for an energy storage system. The method is applied to a battery management system BMS and includes: Obtaining temperature information and humidity information inside the energy storage system through a temperature sensor and a humidity sensor respectively. The temperature information includes the ambient temperature and the temperature of the liquid cooling plate, and the humidity information includes the ambient humidity; Determining the dew point temperature according to the temperature information and the humidity information; Respectively determining whether the air conditioner start condition and the dehumidifier start condition of the dehumidifier are met according to the temperature information, the dew point temperature, and a preset condensation critical value; When the air conditioner start condition is met, start the air conditioner to perform dehumidification processing, and when the dehumidifier start condition is met, start the dehumidifier to perform dehumidification processing.

[0006] In a second aspect, embodiments of the present invention provide an energy storage system. The energy storage system includes: a battery pack, a dehumidifier, an air conditioner, a temperature sensor, a humidity sensor, and a battery management system BMS; The battery pack includes battery cells and a liquid cooling plate for cooling the battery cells by circulating a coolant; The temperature sensor is used to collect the temperature information inside the energy storage system; The humidity sensor is used to collect the humidity information in the energy storage system; The air conditioner and the dehumidifier are used to perform dehumidification processing in the energy storage system when they are in the on state; The BMS includes an acquisition module, a first determination module, a second determination module, and a processing module; The acquisition module respectively acquires the temperature information and the humidity information in the energy storage system through the temperature sensor and the humidity sensor. The temperature information includes the ambient temperature and the liquid cooling plate temperature, and the humidity information includes the ambient humidity; The first determination module determines the dew point temperature according to the temperature information and the humidity information; The second determination module respectively determines whether the air conditioner startup condition of the air conditioner and the dehumidifier startup condition of the dehumidifier are satisfied according to the temperature information, the dew point temperature, and a preset condensation critical value; The processing module starts the air conditioner to perform dehumidification processing when the air conditioner startup condition is satisfied, and starts the dehumidifier to perform dehumidification processing when the dehumidifier startup condition is satisfied.

[0007] In a third aspect, an embodiment of the present invention provides an energy storage device, including the energy storage system according to any one of the first aspects, for executing the thermal management method of the energy storage system according to any one of the second aspects.

[0008] In the embodiment of the present invention, by detecting the temperature information and the humidity information in the energy storage system, it is determined whether dehumidification operation needs to be performed. When dehumidification operation needs to be performed, the power of the air conditioner and the dehumidifier is determined through a control algorithm, and the air conditioner and / or the dehumidifier is controlled to be turned on based on the determined power, reducing the temperature difference between the liquid cooling plate and the ambient temperature in the energy storage system, and reducing the dew point temperature, avoiding the occurrence of condensation phenomenon in the energy storage system, and realizing the dehumidification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0010] Figure 1 The figure shows a schematic structural diagram of an energy storage system provided by an embodiment of the present application; Figure 2 The figure shows a schematic structural diagram of a BMS provided by an embodiment of the present application; Figure 3 The figure shows a flowchart of a thermal management method of an energy storage system provided by an embodiment of the present application; Figure 4 The figure shows a schematic structural diagram of an energy storage device provided by an embodiment of the present application. Detailed implementation manners

[0011] To better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0012] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0013] As Figure 1 shown, it is a schematic structural diagram of an energy storage system provided by an embodiment of the present invention. Refer to Figure 1 , the energy storage system includes: a battery pack 110, an air conditioner 120, a dehumidifier 130, a temperature sensor 140, a humidity sensor 150, and a battery management system (Battery Management System, BMS) 160.

[0014] The battery pack 110 includes battery cells and a liquid cooling plate for cooling the battery cells by circulating a coolant.

[0015] The temperature sensor 140 is used to collect temperature information in the energy storage system. The humidity sensor 150 is used to collect humidity information in the energy storage system. The temperature information includes the ambient temperature in the energy storage system and the temperature of the liquid cooling plate. The humidity information includes the ambient humidity in the energy storage system.

[0016] The temperature sensor specifically includes an ambient temperature sensor 141 and a liquid cooling plate temperature sensor 142. The ambient temperature sensor is deployed on the cabinet door of the internal space of the energy storage system, and is specifically used to obtain the ambient temperature and send the obtained ambient temperature to the BMS. The liquid cooling plate temperature sensor is deployed on the lower surface of the bottom of the liquid cooling plate, and is specifically used to obtain the temperature of the liquid cooling plate and send the obtained temperature of the liquid cooling plate to the BMS. The humidity sensor is deployed on the cabinet door of the internal space of the energy storage system, and is specifically used to obtain the ambient humidity and send the obtained ambient humidity to the BMS. Among them, the installation position of the ambient temperature sensor is generally greater than half of the height of the cabinet, and the installation position of the ambient humidity sensor should be located as close as possible to half of the height of the cabinet.

[0017] Among them, in order to ensure the accuracy of the collected data, the number of the ambient temperature sensor, the liquid cooling plate temperature sensor, and the humidity sensor is two or more. Each sensor will send the collected temperature or humidity to the BMS, and the BMS will specifically determine the temperature information and humidity information in the energy storage system according to the temperature values or humidity values sent by each sensor.

[0018] The BMS160 is used to determine whether dehumidification treatment needs to be performed according to temperature and humidity information, and when it is determined that the treatment needs to be performed, the dehumidification treatment is performed by starting the air conditioner and / or dehumidifier.

[0019] As Figure 2 shown, it is a schematic structural diagram of a BMS provided by an embodiment of the present invention. Refer to Figure 2 , the BMS specifically includes an acquisition module 161, a first determination module 162, a second determination module 163, and a processing module 164.

[0020] The acquisition module 161 is used to acquire the temperature information and humidity information in the energy storage system through a temperature sensor and a humidity sensor respectively.

[0021] Specifically, the BMS will determine the maximum value among the temperatures reported by each ambient temperature sensor as the ambient temperature; determine the minimum value among the temperatures reported by each liquid cooling plate temperature sensor as the liquid cooling plate temperature; and determine the maximum value among the humidities reported by each humidity sensor as the ambient humidity.

[0022] The first determination module 162 is used to determine the dew point temperature according to the acquired temperature information and humidity information.

[0023] The second determination module 163 is used to determine whether the air conditioner start condition and the dehumidifier start condition are satisfied according to the temperature information, the dew point temperature, and a preset condensation critical value.

[0024] The processing module 164 is used to start the air conditioner to perform dehumidification treatment when the air conditioner start condition is satisfied, and start the dehumidifier to perform dehumidification treatment when the dehumidifier start condition is satisfied.

[0025] The air conditioner 120 is used to start and stop according to the control instruction of the BMS to perform dehumidification treatment on the energy storage system in the start state. Specifically, the air conditioner is used to adjust the ambient temperature in the energy storage system to reduce the temperature difference between the liquid cooling plate and the ambient temperature in the energy storage system, thereby avoiding the occurrence of condensation and achieving the dehumidification effect.

[0026] The dehumidifier 130 is used to start and stop according to the control instruction of the BMS to perform dehumidification treatment on the energy storage system in the start state. Specifically, the dehumidifier is used to reduce the ambient humidity in the energy storage system, thereby reducing the dew point temperature in the energy storage system, making it more difficult for the surface temperature of the liquid cooling plate to be lower than the dew point temperature, avoiding the occurrence of condensation, and achieving the dehumidification effect.

[0027] Combined with the energy storage system as Figure 1 shown, as Figure 3The following is a flowchart of a thermal management method for an energy storage system provided by an embodiment of the present invention. This method is applied to a BMS160 as shown in Figure 1 shown below. The specific steps of this method include: S301, obtaining temperature information and humidity information inside the energy storage system through a temperature sensor and a humidity sensor respectively.

[0028] Specifically, the temperature information includes the ambient temperature and the liquid cooling plate temperature, and the humidity information includes the ambient humidity.

[0029] There are at least two ambient temperature sensors, liquid cooling plate temperature sensors, and ambient humidity sensors inside the energy storage system. Each sensor reports the values it has collected to the BMS. The BMS obtains the values collected by each sensor and determines the temperature information and humidity information based on this.

[0030] The BMS determines the maximum value among the ambient temperature values collected by each ambient temperature sensor as the ambient temperature, the minimum value among the liquid cooling plate temperature values collected by each liquid cooling plate sensor as the liquid cooling plate temperature, and the maximum value among the ambient humidity values collected by each humidity sensor as the ambient humidity.

[0031] S302, determining the dew point temperature according to the temperature information and humidity information.

[0032] Specifically, the saturated vapor pressure inside the energy storage system is determined according to the ambient temperature. The specific calculation method of the saturated vapor pressure is: ; where is the saturated vapor pressure corresponding to the ambient temperature, T is the ambient temperature in the temperature information, and 6.112, 17.62, and 243.12 are all Magnus coefficients, which are preset constants in actual applications.

[0033] The vapor pressure inside the energy storage system is determined according to the saturated vapor pressure and the humidity information. The specific calculation method of the vapor pressure is: ; where e is the vapor pressure, RH is the ambient humidity in the humidity information, and e s is the saturated vapor pressure.

[0034] The dew point temperature inside the energy storage system is determined according to the vapor pressure. The specific calculation method of the dew point temperature is: ; where T d is the dew point temperature, e is the vapor pressure, and 6.112, 17.62, and 243.12 are all Magnus coefficients, which are preset constants in actual applications.

[0035] S303. Determine whether the air conditioner startup condition and the dehumidifier startup condition are satisfied according to the temperature information, the dew point temperature, and a preset condensation critical value, respectively.

[0036] Specifically, a first temperature difference and a second temperature difference are determined according to the obtained temperature information and dew point temperature. The first temperature difference is the difference between the ambient temperature and the liquid cooling plate temperature, and the second temperature difference is the difference between the liquid cooling plate temperature and the dew point temperature.

[0037] When the second temperature difference is lower than the first condensation critical value and the first temperature difference is higher than the second condensation critical value, it is determined that the air conditioner startup condition is satisfied.

[0038] When the second temperature difference is lower than the first condensation critical value or the first temperature difference is higher than the second condensation critical value, it is determined that the dehumidifier startup condition is satisfied.

[0039] Among them, the condensation critical value is used to determine and adjust the timing of turning on the air conditioner and the dehumidifier. When the set condensation critical value is larger, the air conditioner or the dehumidifier is more likely to be turned on to perform the dehumidification operation.

[0040] The condensation critical value is determined by the first temperature difference, and the number of temperature sensors and humidity sensors.

[0041] The value of the condensation critical value depends on the temperature difference in the internal environment of the energy storage system, that is, the first temperature difference. When the first temperature difference is large, it cannot be guaranteed that the data collected by the temperature sensors and humidity sensors are accurate enough, and a larger value needs to be taken to ensure the tolerance. Therefore, the larger the first temperature difference, the larger the condensation critical value needs to be set.

[0042] The value of the condensation critical value also depends on the number of sensors deployed in the energy storage system. When the number of sensors deployed in the energy storage system is insufficient, it also cannot be guaranteed that the data collected by the temperature sensors and humidity sensors are accurate enough, and the temperature conditions at each point in the energy storage system cannot be accurately reflected. A larger value also needs to be taken to ensure the tolerance. Therefore, the fewer the number of temperature sensors and humidity sensors, the larger the condensation critical value needs to be set.

[0043] When specifically setting the first condensation critical value and the second condensation critical value, since the dew point temperature is directly related to condensation, condensation will inevitably occur when the liquid cooling plate temperature is less than the dew point temperature. Therefore, the first condensation critical value set for the second temperature difference is larger than the second condensation critical value to ensure a significant difference between the liquid cooling plate temperature and the dew point temperature, thereby ensuring that condensation does not occur.

[0044] Among them, the dew condensation critical value can be preset by the user, or can be adjusted in real time by a dew condensation critical value model deployed in the BMS and pre-trained according to the acquired temperature information and humidity information.

[0045] Specifically, when the internal environment of the energy storage system is relatively stable, that is, the first temperature difference does not fluctuate significantly, and the number of temperature sensors and humidity sensors does not change, the dew condensation critical value is preset by the user. The set dew condensation critical value is applicable to a small change in the first temperature difference and will not change or be adjusted subsequently.

[0046] When the internal environment of the energy storage system is unstable, that is, the first temperature difference may fluctuate significantly, or the number of temperature sensors and humidity sensors may change, a dew condensation critical value model is deployed in the BMS to adaptively adjust the dew condensation critical value.

[0047] Multiple groups of the first temperature difference and their corresponding dew condensation critical values, the number of temperature sensors and their corresponding dew condensation critical values, and the number of humidity sensors and their corresponding dew condensation critical values are acquired in advance as training data to train the dew condensation critical value model. To establish the corresponding relationship between the dew condensation critical value and the first temperature difference, the number of temperature sensors, and the number of humidity sensors in the dew condensation critical value model. The trained dew condensation critical value model is deployed in the BMS.

[0048] When actually implementing the thermal management method of the energy storage system, after acquiring the temperature information and humidity information, the dew condensation critical value model will determine the dew condensation critical value based on the actually determined first temperature difference, the number of temperature sensors, and the number of humidity sensors. And it will adaptively adjust the determined dew condensation critical value as the first temperature difference changes. Thus, the accuracy of the dew condensation critical value is guaranteed, and further, it is ensured that the air conditioner and the dehumidifier will be turned on at the correct time.

[0049] In a specific embodiment, the first dew condensation critical value can be set to 5°C, and the second dew condensation critical value can be set to 3°C.

[0050] In the embodiment of the present invention, since the energy consumption of the air conditioner is relatively high and long-term operation will increase the operating cost, while the energy consumption of the dehumidifier is very low and it can be operated for a long time. Therefore, in the air conditioner startup conditions set for the air conditioner, the air conditioner will be started only when both the first temperature difference and the second temperature difference meet the corresponding conditions; in the dehumidifier startup conditions set for the dehumidifier, the dehumidifier will be started as long as any one of the first temperature difference or the second temperature difference meets the corresponding conditions.

[0051] S304, start the air conditioner to perform dehumidification treatment when the air conditioner startup condition is met, and start the dehumidifier to perform dehumidification treatment when the dehumidifier startup condition is met.

[0052] Specifically, when starting the air conditioner and the dehumidifier, it is necessary to determine the operating power of the air conditioner and the dehumidifier, and control the air conditioner and the dehumidifier to operate according to the determined operating power to perform dehumidification.

[0053] When determining the operating power of the air conditioner, it is necessary to determine the change rates of the liquid-cooled plate temperature and the ambient temperature based on a preset minimum time interval according to the temperature information, so as to determine the operating power of the air conditioner according to the first temperature difference, the change rate of the liquid-cooled plate temperature, and the change rate of the ambient temperature.

[0054] The specific method for determining the operating power of the air conditioner includes: ; P a1 is the operating power of the air conditioner, T a is the ambient temperature, T c is the liquid-cooled plate temperature, (T a -T c ) is the first temperature difference, T' c is the change rate of the liquid-cooled plate temperature, T' a is the change rate of the ambient temperature, and k, k1, and k2 are constants.

[0055] The constants k, k1, and k2 are determined by one or more of the liquid-cooling unit, air conditioner parameters, local environment, and cell performance.

[0056] Among them, when determining the change rate of the liquid-cooled plate temperature and the change rate of the ambient temperature, the following method is used to determine: ; T' is the change rate of temperature, T(t) is the temperature at time t, and b is the minimum time interval for detecting temperature.

[0057] Optionally, since the energy consumption of the air conditioner is relatively high, the power of the air conditioner cannot be increased without limit. Therefore, it is necessary to set a maximum power for the air conditioner. Generally, an energy efficiency ratio threshold and a maximum air conditioner power value are set based on the energy efficiency ratio of the air conditioner.

[0058] During the actual operation, when it is determined that the energy efficiency ratio of the air conditioner is lower than the preset energy efficiency ratio threshold, the preset maximum air conditioner power value is determined as the operating power of the air conditioner, and the operating power of the air conditioner is no longer increased based on the change rate of the liquid-cooled plate temperature, the change rate of the ambient temperature, and the first temperature difference.

[0059] In a specific embodiment, the energy efficiency ratio threshold can be set to 2. When the energy efficiency ratio of the air conditioner is lower than 2, the air conditioner operates through the preset maximum air conditioner power value, and the operating power no longer increases.

[0060] When determining the operating power of the dehumidifier, a third temperature difference between the dew point temperature and the liquid cooling plate temperature is determined, and the operating power of the dehumidifier is determined based on the third temperature difference and the first temperature difference.

[0061] The method for determining the operating power of the dehumidifier specifically includes: ; P a2 is the operating power of the dehumidifier, T a is the ambient temperature, T c is the liquid cooling plate temperature, (T a -T c ) is the first temperature difference, T dd is the third temperature difference, and h, h1, and h2 are constants.

[0062] The constants h, h1, and h2 are determined by one or more of the liquid cooling unit, dehumidifier parameters, local environment, and cell performance.

[0063] Among them, when determining the third temperature difference T dd , when the difference between the dew point temperature and the liquid cooling plate temperature is greater than zero, the third temperature difference is the difference between the dew point temperature and the liquid cooling plate temperature; when the difference between the dew point temperature and the liquid cooling plate temperature is less than or equal to zero, the third temperature difference is 0.

[0064] Optionally, when the liquid cooling unit is operating at maximum power, it is necessary to control the air conditioner and the dehumidifier to start according to the determined power at the same time, so as to perform dehumidification treatment in the energy storage system at the same time.

[0065] Optionally, after the air conditioner and the dehumidifier are started, it is also necessary to determine whether the air conditioner shutdown condition of the air conditioner and the dehumidifier shutdown condition of the dehumidifier are met respectively according to the temperature information, the condensation critical value, and the dead band value.

[0066] When the air conditioner shutdown condition is met, the air conditioner is turned off, and when the dehumidifier shutdown condition is met, the dehumidifier is turned off.

[0067] When determining the shutdown condition, in addition to judging the temperature information and the condensation critical value in the startup condition, the dead band value is also added for judgment. In order to avoid frequent start and stop of the air conditioner and the dehumidifier through the dead band value.

[0068] When the second temperature difference is higher than the sum of the first condensation critical value and the first dead band value, or the second temperature difference is lower than the difference between the second condensation critical value and the second dead band value, it is determined that the air conditioner shutdown condition of the air conditioner is met.

[0069] When the second temperature difference is higher than the sum of the first condensation critical value and the first return difference, and the first temperature difference is lower than the difference between the second condensation critical value and the second return difference, it is determined that the dehumidifier shutdown condition of the dehumidifier is satisfied.

[0070] Among them, the return difference is determined according to the first temperature difference between the ambient temperature in the energy storage system and the temperature of the liquid cooling plate. If the first temperature difference in the energy storage system is too large, the detected temperature may fluctuate due to air flow, and a larger value needs to be taken to ensure the tolerance. Therefore, the larger the first temperature difference, the larger the set return difference will be.

[0071] The return difference specifically includes a first return difference and a second return difference. The first return difference is the return difference for adjusting the first condensation value; the second return difference is the return difference for adjusting the second condensation value.

[0072] Similarly, when specifically setting the first return difference and the second return difference, since the dew point temperature is directly related to condensation, condensation will inevitably occur when the temperature of the liquid cooling plate is less than the dew point temperature. Therefore, the second return difference set for the second condensation critical value is larger than the first return difference set for the first condensation critical value to ensure a significant difference between the temperature of the liquid cooling plate and the dew point temperature, thereby ensuring that the condensation phenomenon does not occur.

[0073] In order to ensure that the system can respond to external changes normally, an upper limit is also set for the return difference to ensure that the return difference does not increase indefinitely with the first temperature difference.

[0074] Specifically, it is determined whether the first temperature difference is greater than a preset temperature difference. When the first temperature difference is greater than the preset temperature difference threshold, the first return difference and the second return difference are determined based on the preset maximum return difference; when the first temperature difference is not greater than the preset temperature difference threshold, the first return difference and the second return difference are determined through a first temperature difference and a preset return difference determination function. The return difference determination function is a function in which the return difference increases as the first temperature difference increases.

[0075] In a specific embodiment, the temperature difference threshold is set to 5, the upper limit of the first return difference is set to 0.3, and the upper limit of the second return difference is set to 0.5.

[0076] The return difference determination function for the first return difference is: ; The return difference determination function for the second return difference is: ; Among them, a1 is the first return difference, a2 is the second return difference, is the first temperature difference.

[0077] When When it is less than 5, the upper limits a1 = 0.3 and a2 = 0.5 of the first difference and the second difference are respectively taken.

[0078] In the embodiment of the present invention, by detecting the temperature information and humidity information in the energy storage system, it is determined whether dehumidification operation needs to be performed. When dehumidification operation needs to be performed, the powers of the air conditioner and the dehumidifier are determined through a control algorithm, and the air conditioner and / or the dehumidifier are controlled to be turned on based on the determined powers, so as to reduce the temperature difference between the liquid cooling plate and the internal environment temperature of the energy storage system, and reduce the dew point temperature, avoiding the occurrence of condensation phenomenon in the energy storage system and achieving the dehumidification effect.

[0079] Figure 4 It is a schematic structural diagram of an embodiment of the energy storage device in this specification. The energy storage device includes an energy storage system as Figure 1 shown. As Figure 4 shown, the above energy storage device may include at least one processor; and at least one memory communicatively connected to the above processing unit, wherein: the memory stores program instructions executable by the processing unit, and the above processor can execute the thermal management method of the energy storage system provided in this embodiment by calling the above program instructions.

[0080] Figure 4 It shows a block diagram of an exemplary energy storage device suitable for implementing the embodiments of this specification. Figure 4 The shown energy storage device is only an example, and should not bring any limitation to the functions and usage scope of the embodiments of this specification.

[0081] As Figure 4 shown, the energy storage device is presented in the form of a general computing device. The components of the energy storage device may include but are not limited to: one or more processors 410, a communication interface 420, a memory 430, and a communication bus 440 connecting different system components (including the memory 430, the communication interface 420, and the processor 410).

[0082] The communication bus 440 represents one or more of several types of bus architectures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of the various bus architectures. By way of example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnection (PCI) bus.

[0083] The storage device typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the storage device, including volatile and non-volatile media, removable and non-removable media.

[0084] The memory 430 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The storage device may further include other removable / non-removable, volatile / non-volatile computer system storage media. The memory 430 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the embodiments of the present specification.

[0085] A program / utility having a set (at least one) of program modules may be stored in the memory 430, and such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, and an implementation of a network environment may be included in each or some combination of these examples. The program modules generally perform the functions and / or methods in the embodiments described in the present specification.

[0086] The processor 410 executes various functional applications and data processing by running the programs stored in the memory 430, such as implementing the thermal management method of the energy storage system provided by the embodiments shown in the present specification.

[0087] The embodiments of the present specification provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to execute the thermal management method of the energy storage system provided by the embodiments shown in the present specification.

[0088] The above describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims may be performed in a different order than in the embodiments and still achieve the desired results. Additionally, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0089] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this specification, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0090] Any process or method description in a flowchart or otherwise described herein can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of this specification includes additional implementations where the functions may be performed in a manner not shown or discussed, including substantially concurrently or in the reverse order according to the functions involved, which should be understood by those skilled in the art to which the embodiments of this specification pertain.

[0091] Depending on the context, the word "if" as used herein can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (stated condition or event)" or "in response to detecting (stated condition or event)".

[0092] In the embodiments provided in this specification, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0093] In addition, the functional units in the embodiments of this specification may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0094] The above-mentioned integrated units implemented in the form of software functional units may be stored in a computer-readable storage medium. The above-mentioned software functional units stored in a storage medium include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute some steps of the methods described in the embodiments of this specification.

[0095] The foregoing is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this specification shall be included within the scope of protection of this specification.

Claims

1. A thermal management method for an energy storage system, characterized in that: The method is applied to a battery management system BMS, and the method comprises: Acquire temperature information and humidity information in the energy storage system through a temperature sensor and a humidity sensor respectively, wherein the temperature information includes the ambient temperature and the liquid cooling plate temperature, and the humidity information includes the ambient humidity; determining a dew point temperature according to the temperature information and the humidity information; Determining whether an air conditioner start-up condition of an air conditioner and a dehumidifier start-up condition of a dehumidifier are met according to the temperature information, the dew point temperature and a preset condensation critical value; When the air conditioner start-up condition is met, the air conditioner is started to perform a dehumidification process, and when the dehumidifier start-up condition is met, the dehumidifier is started to perform a dehumidification process.

2. The thermal management method of the energy storage system according to claim 1, characterized in that: The determining whether an air conditioner start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are satisfied respectively according to the temperature information, the dew point temperature and a preset condensation critical value includes: When the second temperature difference is lower than the first condensation critical value, and the first temperature difference is higher than the second condensation critical value, it is determined that the air conditioning start-up condition is met; When the second temperature difference is lower than the first condensation critical value, or the first temperature difference is higher than the second condensation critical value, it is determined that the dehumidifier start-up condition is met.

3. The thermal management method of the energy storage system according to claim 2, characterized in that: Also includes: The condensation critical value is determined by the first temperature difference and the number of the temperature sensors and the humidity sensors; The larger the first temperature difference is, the larger the condensation critical value is; The fewer the number of the temperature sensors and the humidity sensors, the greater the condensation critical value.

4. The thermal management method of the energy storage system according to claim 1, characterized in that: After starting the air conditioner to perform the dehumidification process, and / or starting the dehumidifier to perform the dehumidification process, the method further includes: Determining whether an air conditioner shut-down condition of the air conditioner and a dehumidifier shut-down condition of the dehumidifier are met according to the temperature information, the dew point temperature, the condensation critical value and the hysteresis value; The air conditioner is turned off when the air conditioner turning off condition is met, and the dehumidifier is turned off when the dehumidifier turning off condition is met.

5. The thermal management method of the energy storage system according to claim 4, characterized in that: The determining whether the air conditioner shut-down condition of the air conditioner and the dehumidifier shut-down condition of the dehumidifier are satisfied respectively includes: When the second temperature difference is higher than the sum of the first condensation critical value and the first return difference value, or the first temperature difference is lower than the difference between the second condensation critical value and the second return difference value, it is determined that the air conditioning shut-down condition of the air conditioner is met; When the second temperature difference is higher than the sum of the first condensation critical value and the first return difference, and the first temperature difference is lower than the difference between the second condensation critical value and the second return difference, it is determined that the dehumidifier shut-down condition of the dehumidifier is met.

6. The thermal management method of the energy storage system according to claim 5, characterized in that: Also includes: The hysteresis value is determined according to the first temperature difference value, and the larger the first temperature difference value is, the larger the hysteresis value is; Wherein, determining the hysteresis value includes: Determining whether the first temperature difference is greater than a preset temperature difference threshold; When the first temperature difference is greater than a preset temperature difference threshold, determining the first hysteresis value and the second hysteresis value based on a preset maximum hysteresis value; When the first temperature difference is not greater than a preset temperature difference threshold, determining the first hysteresis value and the second hysteresis value by using the first temperature difference and a preset hysteresis value determination function; Among them, the hysteresis value determination function is a function in which the hysteresis value increases with the increase of the first temperature difference value, the first hysteresis value is the hysteresis value for adjusting the first condensation critical value, and the second hysteresis value is the hysteresis value for adjusting the second condensation critical value.

7. The thermal management method of the energy storage system according to claim 1, characterized in that: Starting an air conditioner to perform a dehumidification process, and / or starting a dehumidifier to perform a dehumidification process, further comprising: determining the operating power of the air conditioner and the dehumidifier; Wherein, determining the operating power of the air conditioner includes: Determine, according to the temperature information, a change rate of the temperature of the liquid cooling plate and the ambient temperature based on a preset minimum time interval; Determining the operating power of the air conditioner according to the first temperature difference, the change rate of the liquid cooling plate temperature, and the change rate of the ambient temperature; Determining the operating power of the dehumidifier includes: determining a third temperature difference; determining the operating power of the dehumidifier according to the third temperature difference and the first temperature difference; Among them, when the difference between the dew point temperature and the liquid cooling plate temperature is greater than 0, the third temperature difference is the difference between the dew point temperature and the liquid cooling plate temperature; when the difference between the dew point temperature and the liquid cooling plate temperature is less than or equal to 0, the third temperature difference is 0.

8. The thermal management method of the energy storage system according to claim 7, characterized in that: The method of determining the operating power of the air conditioner further comprises: When it is determined that the energy efficiency ratio of the air conditioner is lower than a preset energy efficiency ratio threshold, the preset air conditioner maximum power value is determined as the operating power of the air conditioner, and the operating power of the air conditioner is no longer increased based on the change rate of the liquid cooling plate temperature, the change rate of the ambient temperature and the first temperature difference.

9. The thermal management method of the energy storage system according to claim 1, characterized in that: The determining the dew point temperature according to the temperature information and the humidity information includes: Determine the saturated vapor pressure in the energy storage system according to the ambient temperature; Determining the vapor pressure in the energy storage system according to the saturated vapor pressure and the humidity information; The dew point temperature in the energy storage system is determined based on the vapor pressure.

10. The thermal management method of the energy storage system according to any one of claims 1 to 9, characterized in that: include: The first temperature difference is the difference between the ambient temperature and the temperature of the liquid cooling plate; The second temperature difference is the difference between the temperature of the liquid cooling plate and the dew point temperature.

11. An energy storage system, characterized in that: The energy storage system includes: a battery pack, a dehumidifier, an air conditioner, a temperature sensor, a humidity sensor, and a battery management system BMS; The battery pack includes a battery cell and a liquid cooling plate for cooling the battery cell by circulating a cooling liquid; The temperature sensor is used to collect temperature information in the energy storage system; The humidity sensor is used to collect humidity information in the energy storage system; The air conditioner and the dehumidifier are used to perform dehumidification processing in the energy storage system in a turned-on state; The BMS includes an acquisition module, a first determination module, a second determination module and a processing module; The acquisition module acquires temperature information and humidity information in the energy storage system through the temperature sensor and the humidity sensor respectively, the temperature information includes the ambient temperature and the liquid cooling plate temperature, and the humidity information includes the ambient humidity; The first determination module determines the dew point temperature according to the temperature information and the humidity information; The second determination module determines whether an air conditioner start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are met according to the temperature information, the dew point temperature and a preset condensation critical value; The processing module starts the air conditioner to perform dehumidification processing when the air conditioner start-up condition is met, and starts the dehumidifier to perform dehumidification processing when the dehumidifier start-up condition is met.

12. The energy storage system according to claim 11, characterized in that: The temperature sensors include: an ambient temperature sensor and a liquid cooling plate temperature sensor; The ambient temperature sensor is deployed on the cabinet door of the internal space of the energy storage system, and is used to obtain the ambient temperature and send it to the BMS; The liquid cooling plate temperature sensor is disposed on the lower surface of the bottom of the liquid cooling plate, and is used to obtain the temperature of the liquid cooling plate and send it to the BMS; Among them, the number of the ambient temperature sensors, the liquid cooling plate temperature sensors and the humidity sensors are two or more, and the BMS takes the maximum value of the values ​​reported by each of the ambient temperature sensors as the ambient temperature, takes the minimum value of the values ​​reported by each of the liquid cooling plate temperature sensors as the liquid cooling plate temperature, and takes the maximum value of the values ​​reported by each of the humidity sensors as the humidity information.

13. An energy storage device, comprising the energy storage system according to any one of claims 11 to 12, and used to execute the thermal management method of the energy storage system according to any one of claims 1 to 10.

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