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

Abstract

The present application relates to the field of energy storage technology, and in particular to a thermal management method for an energy storage system, an energy storage system, and electrical equipment. A thermal management method for an energy storage system, comprising: obtaining temperature information and humidity information in the energy storage system respectively through a temperature sensor and a humidity sensor; determining the dew point temperature according to the temperature information and the humidity information; determining whether the air conditioning start-up conditions of the air conditioner and the dehumidifier start-up conditions of the dehumidifier are met respectively according to the temperature information, the dew point temperature, and a preset condensation critical value; starting the air conditioner to perform dehumidification processing when the air conditioning start-up conditions are met, and starting the dehumidifier to perform dehumidification processing when the dehumidifier start-up conditions are met. The embodiment of the present invention reduces the difference between the liquid cold plate and the ambient temperature in the energy storage system, and reduces the dew point temperature by controlling the start-up of the air conditioner and the dehumidifier, thereby avoiding condensation in the energy storage system and achieving a dehumidification effect.

Description

Technical Field

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

[0002] Energy storage systems contain battery cells, which generate heat during the charging and discharging process, causing the cell temperature to rise. Failure to control the cell temperature can lead to reduced efficiency, shortened lifespan, or even thermal runaway. Because natural heat dissipation from the cell cannot maintain the temperature within the operating range, cooling equipment, such as liquid cold plates, is necessary.

[0003] Due to the temperature difference between the liquid cooling plate and the energy storage system's surroundings, condensation forms on the surface of the plate when its surface temperature falls below the dew point of moist air. If this condensation drips onto electrical components, it can damage them or create a safety risk of a short circuit. Therefore, thermal management of the energy storage system is necessary to achieve effective dehumidification. Summary of the Invention

[0004] The embodiments of the present invention provide a thermal management method for an energy storage system, an energy storage system, and electrical equipment, to solve the problem in the prior art of condensation on the surface of a liquid cooling plate of an energy storage system causing damage to electrical components.

[0005] In a first aspect, an embodiment of the present invention provides a thermal management method for an energy storage system, the method being applied to a battery management system (BMS), the method comprising:

[0006] 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;

[0007] determining a dew point temperature according to the temperature information and the humidity information;

[0008] determining whether an air-conditioning start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are satisfied, respectively, based on the temperature information, the dew point temperature, and a preset condensation threshold value;

[0009] When the air conditioner start-up condition is met, the air conditioner is started to perform a dehumidification process; when the dehumidifier start-up condition is met, the dehumidifier is started to perform a dehumidification process.

[0010] In a second aspect, an embodiment of the present invention provides an energy storage system, comprising: a battery pack, a dehumidifier, an air conditioner, a temperature sensor, a humidity sensor, and a battery management system BMS;

[0011] The battery pack includes a battery cell and a liquid cooling plate for cooling the battery cell by circulating a coolant;

[0012] The temperature sensor is used to collect temperature information in the energy storage system;

[0013] The humidity sensor is used to collect humidity information in the energy storage system;

[0014] The air conditioner and the dehumidifier are used to perform a dehumidification process in the energy storage system when turned on;

[0015] The BMS includes an acquisition module, a first determination module, a second determination module, and a processing module;

[0016] The acquisition module acquires temperature information and humidity information in the energy storage system through the temperature sensor and the 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;

[0017] The first determining module determines the dew point temperature according to the temperature information and the humidity information;

[0018] The second determining module determines whether an air conditioner start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are satisfied according to the temperature information, the dew point temperature and a preset condensation threshold value;

[0019] 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.

[0020] In a third aspect, an embodiment of the present invention provides an energy storage device, comprising the energy storage system described in any one of the first aspects, and configured to execute the thermal management method for the energy storage system described in any one of the second aspects.

[0021] In this embodiment of the present invention, the need for dehumidification is determined by detecting temperature and humidity information within the energy storage system. When dehumidification is required, a control algorithm determines the power of the air conditioner and dehumidifier. Based on the determined power, the air conditioner and / or dehumidifier are activated to reduce the temperature difference between the liquid cooling plate and the ambient temperature within the energy storage system, lowering the dew point and preventing condensation within the energy storage system, thereby achieving a dehumidification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 FIG2 is a schematic structural diagram of an energy storage system provided in an embodiment of the present application;

[0024] Figure 2 The figure shows a structural diagram of a BMS provided in an embodiment of the present application;

[0025] Figure 3 Shown is a flow chart of a thermal management method for an energy storage system provided in an embodiment of the present application;

[0026] Figure 4 Shown is a structural schematic diagram of an energy storage device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] like Figure 1 FIG2 is a schematic diagram of the structure of an energy storage system provided by an embodiment of the present invention. 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 (BMS) 160 .

[0030] The battery pack 110 includes battery cells and a liquid cooling plate that cools the battery cells by circulating a coolant.

[0031] Temperature sensor 140 is used to collect temperature information within the energy storage system. Humidity sensor 150 is used to collect humidity information within the energy storage system. Temperature information includes the ambient temperature within the energy storage system and the temperature of the liquid cooling plate. Humidity information includes the ambient humidity within the energy storage system.

[0032] The temperature sensors specifically include 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, specifically for obtaining the ambient temperature and sending 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, specifically for obtaining the liquid cooling plate temperature and sending the obtained liquid cooling plate temperature to the BMS. The humidity sensor is deployed on the cabinet door of the internal space of the energy storage system, specifically for obtaining the ambient humidity and sending the obtained ambient humidity to the BMS. The installation position of the ambient temperature sensor is generally greater than half the height of the cabinet, and the installation position of the ambient humidity sensor should be as close to half the height of the cabinet as possible.

[0033] To ensure the accuracy of collected data, two or more ambient temperature sensors, liquid cooling plate temperature sensors, and humidity sensors are used. Each sensor sends the collected temperature or humidity data to the BMS, which then determines the temperature and humidity information within the energy storage system based on the temperature or humidity values ​​sent by each sensor.

[0034] The BMS 160 is configured to determine whether a dehumidification process needs to be performed based on the temperature and humidity information, and to perform the dehumidification process by activating an air conditioner and / or a dehumidifier when it is determined that the process needs to be performed.

[0035] like Figure 2 FIGURE 1 is a schematic diagram of the structure of a BMS provided by an embodiment of the present invention. 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 .

[0036] The acquisition module 161 is configured to acquire temperature information and humidity information in the energy storage system via a temperature sensor and a humidity sensor, respectively.

[0037] Specifically, the BMS will determine the temperature with the largest value reported by each ambient temperature sensor as the ambient temperature; the temperature with the smallest value reported by each liquid cooling plate temperature sensor as the liquid cooling plate temperature; and the humidity with the largest value reported by each humidity sensor as the ambient humidity.

[0038] The first determining module 162 is configured to determine the dew point temperature according to the acquired temperature information and humidity information.

[0039] The second determining module 163 is configured to determine whether an air conditioner start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are satisfied according to the temperature information, the dew point temperature and a preset condensation threshold value.

[0040] The processing module 164 is configured to start the air conditioner to perform dehumidification processing when the air conditioner start-up condition is met, and to start the dehumidifier to perform dehumidification processing when the dehumidifier start-up condition is met.

[0041] Air conditioner 120 is activated and deactivated according to control commands from the BMS, dehumidifying the energy storage system when activated. Specifically, the air conditioner regulates the ambient temperature within the energy storage system, minimizing the temperature difference between the liquid cooling plate and the ambient temperature within the energy storage system, thereby preventing condensation and achieving a dehumidification effect.

[0042] Dehumidifier 130 is activated and deactivated according to BMS control commands to dehumidify the energy storage system when in operation. Specifically, the dehumidifier lowers the ambient humidity within the energy storage system, thereby reducing the dew point temperature within the system. This makes it more difficult for the surface temperature of the liquid cooling plate to fall below the dew point, preventing condensation and achieving a dehumidification effect.

[0043] Combined with Figure 1 The energy storage system shown in Figure 3 The figure shows a flow chart of a thermal management method for an energy storage system provided by an embodiment of the present invention. The method is applied to Figure 1 For the BMS 160 shown in FIG. 1 , the specific steps of the method include:

[0044] S301 , obtaining temperature information and humidity information in the energy storage system through a temperature sensor and a humidity sensor respectively.

[0045] Specifically, the temperature information includes the ambient temperature and the liquid cooling plate temperature, and the humidity information includes the ambient humidity.

[0046] The energy storage system is equipped with at least two ambient temperature sensors, a liquid cooling plate temperature sensor, and an ambient humidity sensor. Each sensor reports its own collected value to the BMS. The BMS uses the values ​​collected by each sensor to determine temperature and humidity information.

[0047] The BMS will determine the maximum value of the ambient temperature values ​​collected by each ambient temperature sensor as the ambient temperature, the minimum value of the liquid cooling plate temperature values ​​collected by each liquid cooling plate sensor as the liquid cooling plate temperature, and the maximum value of the ambient humidity values ​​collected by each humidity sensor as the ambient humidity.

[0048] S302: Determine the dew point temperature according to the temperature information and the humidity information.

[0049] Specifically, the saturated vapor pressure in the energy storage system is determined based on the ambient temperature. The specific calculation method of the saturated vapor pressure is:

[0050] ;

[0051] in, is the saturated vapor pressure corresponding to the ambient temperature, T is the ambient temperature in the temperature information, 6.112, 17.62, and 243.12 are all Magnus coefficients, which are preset constants in practical applications.

[0052] The vapor pressure in the energy storage system is determined based on the saturated vapor pressure and humidity information. The specific calculation method of vapor pressure is:

[0053] ;

[0054] Among them, e is the vapor pressure, RH is the ambient humidity in the humidity information, and e s is the saturated vapor pressure.

[0055] The dew point temperature in the energy storage system is determined based on the vapor pressure. The specific calculation method of the dew point temperature is:

[0056] ;

[0057] Among them, T d is the dew point temperature, e is the vapor pressure, 6.112, 17.62, and 243.12 are Magnus coefficients, which are preset constants in practical applications.

[0058] S303: Determine whether an air conditioner start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are satisfied based on the temperature information, the dew point temperature, and a preset condensation threshold value.

[0059] Specifically, a first temperature difference and a second temperature difference are determined based on the acquired temperature information and the 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.

[0060] 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.

[0061] 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 met.

[0062] The condensation threshold value is used to determine and adjust the timing of turning on the air conditioner and dehumidifier. When the condensation threshold value is set higher, the air conditioner or dehumidifier is more likely to be turned on to perform dehumidification operations.

[0063] The condensation threshold value is determined by the first temperature difference and the number of temperature sensors and humidity sensors.

[0064] The condensation threshold value depends on the temperature difference within the energy storage system, known as the first temperature difference. When the first temperature difference is large, the accuracy of the data collected by the temperature and humidity sensors cannot be guaranteed, so a larger value is required to maintain the tolerance. Therefore, the larger the first temperature difference, the larger the condensation threshold value needs to be set.

[0065] The condensation threshold value also depends on the number of sensors deployed in the energy storage system. If the number of sensors deployed is insufficient, the data collected by the temperature and humidity sensors cannot be guaranteed to be accurate enough to accurately reflect the temperature conditions at each point in the energy storage system. Therefore, a larger value is required to ensure tolerance. Therefore, the fewer temperature and humidity sensors there are, the larger the condensation threshold value should be.

[0066] 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 lower than the dew point temperature. Therefore, the first condensation critical value set for the second temperature difference will be larger than the second condensation critical value to ensure that there is a significant difference between the liquid cooling plate temperature and the dew point temperature, thereby ensuring that condensation does not occur.

[0067] The condensation critical value may be pre-set by the user, or may be adjusted in real time by a pre-trained condensation critical value model deployed in the BMS based on the acquired temperature and humidity information.

[0068] Specifically, when the environment within 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 user can pre-set the condensation threshold value. The set condensation threshold value is applicable to small changes in the first temperature difference and will not be changed or adjusted subsequently.

[0069] When the environment within 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 condensation critical value model is deployed in the BMS to adaptively adjust the condensation critical value.

[0070] Multiple sets of first temperature difference values ​​and their corresponding condensation threshold values, the number of temperature sensors and their corresponding condensation threshold values, and the number of humidity sensors and their corresponding condensation threshold values ​​are pre-acquired as training data to train a condensation threshold value model. This establishes a correspondence between the condensation threshold value and the first temperature difference, the number of temperature sensors, and the number of humidity sensors in the condensation threshold value model. The trained condensation threshold value model is deployed within the BMS.

[0071] During the actual implementation of the energy storage system's thermal management method, after acquiring temperature and humidity information, the condensation threshold value model determines a condensation threshold value based on the actual first temperature difference, the number of temperature sensors, and the number of humidity sensors. The model adaptively adjusts the determined condensation threshold value as the first temperature difference changes. This ensures the accuracy of the condensation threshold value and, consequently, ensures that the air conditioner and dehumidifier are activated at the correct time.

[0072] In a specific embodiment, the first condensation critical value may be set to 5°C, and the second condensation critical value may be set to 3°C.

[0073] In this embodiment of the present invention, since air conditioners consume relatively high energy, running them for extended periods of time increases operating costs. Dehumidifiers, on the other hand, consume very little energy and can be kept running for extended periods. Therefore, the air conditioner activation conditions set for the air conditioner require that both the first and second temperature differences meet their corresponding conditions for the air conditioner to activate. Similarly, the dehumidifier activation conditions set for the dehumidifier require that only either the first or second temperature difference meet their corresponding conditions for the dehumidifier to activate.

[0074] S304: When the air conditioner start-up condition is met, the air conditioner is started to perform a dehumidification process; when the dehumidifier start-up condition is met, the dehumidifier is started to perform a dehumidification process.

[0075] 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.

[0076] When determining the operating power of the air conditioner, it is necessary to determine the change rate of the liquid cooling plate temperature and the ambient temperature based on a preset minimum time interval based on the temperature information, and thus determine the operating power of the air conditioner based on the first temperature difference, the change rate of the liquid cooling plate temperature, and the change rate of the ambient temperature.

[0077] The specific methods for determining the operating power of the air conditioner include:

[0078] ;

[0079] P a1 is the operating power of the air conditioner, T a is the ambient temperature, T c is the liquid cooling plate temperature, (T a -T c ) is the first temperature difference, T' c is the rate of change of the liquid cooling plate temperature, T' a is the rate of change of ambient temperature, k, k1, k2 are constants.

[0080] The constants k, k1, and k2 are determined by one or more of the liquid cooling unit, air conditioning parameters, local environment, and battery cell performance.

[0081] The change rate of the liquid cooling plate temperature and the change rate of the ambient temperature are determined in the following manner: ;

[0082] T' is the rate of change of temperature, T(t) is the temperature at time t, and b is the minimum time interval for detecting temperature.

[0083] Optionally, due to the high energy consumption of air conditioners, the power of the air conditioner cannot be increased indefinitely. Therefore, a maximum power setting is required for the air conditioner. Generally, the energy efficiency ratio threshold and the maximum power value of the air conditioner are set based on the energy efficiency ratio of the air conditioner.

[0084] During 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 power value of the air conditioner is determined as the operating power of the air conditioner, and the operating power of the air conditioner will no longer be increased based on the change rate of the liquid cooling plate temperature, the change rate of the ambient temperature and the first temperature difference.

[0085] In a specific embodiment, the energy efficiency ratio threshold may be set to 2. When the energy efficiency ratio of the air conditioner is lower than 2, the air conditioner operates at a preset maximum power value, and the operating power no longer increases.

[0086] 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.

[0087] The specific methods for determining the operating power of the dehumidifier include:

[0088] ;

[0089] 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.

[0090] The constants h, h1, and h2 are determined by one or more of the liquid cooling unit, dehumidifier parameters, local environment, and battery cell performance.

[0091] Wherein, when determining the third temperature difference T ddWhen 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.

[0092] Optionally, when the liquid cooling unit is operating at maximum power, it is necessary to control the air conditioner and the dehumidifier to be turned on simultaneously according to the determined power, so as to perform dehumidification processing in the energy storage system at the same time.

[0093] Optionally, when the air conditioner and dehumidifier are turned on, it is also necessary to determine whether the air conditioner's air conditioning off condition and the dehumidifier's dehumidifier off condition are met based on the temperature information, the condensation critical value and the hysteresis value.

[0094] 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.

[0095] When determining the shutdown conditions, in addition to the temperature information and condensation threshold value in the startup conditions, the hysteresis value is also added to the judgment. This hysteresis value can be used to avoid frequent startup and shutdown of the air conditioner and dehumidifier.

[0096] When the second temperature difference is higher than the sum of the first condensation threshold value and the first return difference value, or the second temperature difference is lower than the difference between the second condensation threshold value and the second return difference value, it is determined that the air conditioning shutoff condition of the air conditioner is met.

[0097] 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 met.

[0098] The hysteresis value is determined by the first temperature difference between the ambient temperature within the energy storage system and the temperature of the liquid cooling plate. If the first temperature difference within the energy storage system is too large, air flow may cause the detected temperature to fluctuate, requiring a larger value to maintain tolerance. Therefore, the larger the first temperature difference, the larger the hysteresis value should be set.

[0099] The hysteresis value specifically includes a first hysteresis value and a second hysteresis value. The first hysteresis value is a hysteresis value for adjusting the first condensation value; the second hysteresis value is a hysteresis value for adjusting the second condensation value.

[0100] Similarly, when setting the first return difference value and the second return difference value, since the dew point temperature is directly related to condensation, condensation will inevitably occur when the liquid cooling plate temperature is lower than the dew point temperature. Therefore, the second return difference value set for the second condensation critical value will be larger than the first return difference value set for the first condensation critical value to ensure that there is a significant difference between the liquid cooling plate temperature and the dew point temperature, thereby ensuring that condensation does not occur.

[0101] In order to ensure that the system can respond normally to external changes, an upper limit is set for the hysteresis value to ensure that the hysteresis value does not increase indefinitely with the first temperature difference.

[0102] Specifically, it is determined whether the first temperature difference is greater than a preset temperature difference. When the first temperature difference is greater than a preset temperature difference threshold, the first and second hysteresis differences are determined based on a preset maximum hysteresis value. When the first temperature difference is not greater than the preset temperature difference threshold, the first and second hysteresis differences are determined using the first temperature difference and a preset hysteresis value determination function. The hysteresis value determination function is a function in which the hysteresis value increases as the first temperature difference increases.

[0103] In a specific embodiment, the temperature difference threshold is set to 5, the upper limit of the first hysteresis value is set to 0.3, and the upper limit of the second hysteresis value is set to 0.5.

[0104] The hysteresis value determination function for the first hysteresis value is:

[0105] ;

[0106] The hysteresis value determination function for the second hysteresis value is:

[0107] ;

[0108] Among them, a1 is the first hysteresis value, a2 is the second hysteresis value, is the first temperature difference.

[0109] when <5, the upper limits of the first and second hysteresis differences are a1=0.3 and a2=0.5 respectively.

[0110] In this embodiment of the present invention, the need for dehumidification is determined by detecting temperature and humidity information within the energy storage system. When dehumidification is required, a control algorithm determines the power of the air conditioner and dehumidifier. Based on the determined power, the air conditioner and / or dehumidifier are activated to reduce the temperature difference between the liquid cooling plate and the ambient temperature within the energy storage system, lowering the dew point and preventing condensation within the energy storage system, thereby achieving a dehumidification effect.

[0111] Figure 4 This is a schematic diagram of the structure of an embodiment of the energy storage device of this specification. The energy storage device includes Figure 1 The energy storage system shown in Figure 1 is as follows. Figure 4As shown, the energy storage device may include at least one processor; and at least one memory communicatively connected to the processing unit, wherein: the memory stores program instructions that can be executed by the processing unit, and the processor calls the program instructions to execute the thermal management method of the energy storage system provided in this embodiment.

[0112] Figure 4 A block diagram of an exemplary energy storage device suitable for implementing embodiments of the present description is shown. Figure 4 The energy storage device shown is only an example and should not limit the functions and scope of use of the embodiments of this specification.

[0113] like Figure 4 As shown, the energy storage device is implemented as a general-purpose computing device. 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 the various system components (including the memory 430, the communication interface 420, and the processor 410).

[0114] Communication bus 440 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. Examples of these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnection (PCI) bus.

[0115] Energy storage devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by the energy storage device, including volatile and non-volatile media, removable and non-removable media.

[0116] Memory 430 may include computer-readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The energy storage device may further include other removable / non-removable, volatile / non-volatile computer system storage media. Memory 430 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of various embodiments of this specification.

[0117] A program / utility having a set (at least one) of program modules may be stored in memory 430. Such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. The program modules generally implement the functions and / or methods of the embodiments described herein.

[0118] 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 in the embodiments shown in this specification.

[0119] An embodiment of this specification provides a non-transitory computer-readable storage medium, which stores computer instructions. The computer instructions enable the computer to execute the thermal management method of the energy storage system provided by the embodiment shown in this specification.

[0120] The foregoing description of this specification describes specific embodiments. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0121] 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 number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout this specification, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0122] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of this specification includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of this specification belong.

[0123] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0124] 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 merely a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some interface, indirect coupling or communication connection of the device or unit, which may be electrical, mechanical or other forms.

[0125] In addition, the functional units in the various embodiments of this specification may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or hardware plus software functional units.

[0126] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit stored in a storage medium includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute some of the steps of the method described in various embodiments of this specification.

[0127] The above description 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 principles of this specification should be included in 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 includes: 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-conditioning start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are satisfied, respectively, based on the temperature information, the dew point temperature, and a preset condensation threshold value; When the air conditioner start-up condition is met, the air conditioner is started to perform a dehumidification process; when the dehumidifier start-up condition is met, the dehumidifier is started to perform a dehumidification process; The determining whether an air conditioner start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are satisfied based on 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, determining 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 startup condition is met; 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.

2. The thermal management method of the energy storage system according to claim 1, characterized in that: Also includes: The condensation threshold 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.

3. 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-conditioning shut-off condition of the air conditioner and a dehumidifier shut-off condition of the dehumidifier are satisfied respectively 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.

4. The thermal management method of the energy storage system according to claim 3, characterized in that: The determining whether the air conditioner shutoff condition of the air conditioner and the dehumidifier shutoff condition of the dehumidifier are satisfied respectively includes: When the second temperature difference is higher than the sum of the first condensation threshold value and the first return difference value, or the first temperature difference is lower than the difference between the second condensation threshold value and the second return difference value, determining that the air conditioning shutoff 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 shutdown condition of the dehumidifier is met.

5. The thermal management method of the energy storage system according to claim 4, characterized in that: Also includes: The hysteresis value is determined according to the first temperature difference, and the greater the first temperature difference is, the greater 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; 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 a hysteresis value for adjusting the first condensation critical value, and the second hysteresis value is a hysteresis value for adjusting the second condensation critical value.

6. 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 operating power of the air conditioner and the dehumidifier; Wherein, determining the operating power of the air conditioner includes: Determining, based on the temperature information, a rate of change of the liquid cooling plate temperature 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 rate of change of the liquid cooling plate temperature, and the rate of change of the ambient temperature; Determining the operating power of the dehumidifier includes: determining a third temperature difference; determining an 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.

7. The thermal management method of the energy storage system according to claim 6, characterized in that: The method of determining the operating power of the air conditioner further includes: When it is determined that the energy efficiency ratio of the air conditioner is lower than a preset energy efficiency ratio threshold, the preset maximum power value of the air conditioner 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.

8. 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: determining a saturated vapor pressure within the energy storage system according to the ambient temperature; determining a vapor pressure within the energy storage system based on the saturated vapor pressure and the humidity information; The dew point temperature in the energy storage system is determined based on the vapor pressure.

9. An energy storage system, characterized in that: The energy storage system includes: battery pack, dehumidifier, air conditioner, temperature sensor, humidity sensor, battery management system BMS; The battery pack includes a battery cell and a liquid cooling plate for cooling the battery cell by circulating a coolant; 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 a dehumidification process in the energy storage system when turned on; 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, wherein the temperature information includes the ambient temperature and the liquid cooling plate temperature, and the humidity information includes the ambient humidity; The first determining module determines the dew point temperature according to the temperature information and the humidity information; The second determining module determines whether an air conditioner start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are satisfied according to the temperature information, the dew point temperature and a preset condensation threshold 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; The determining whether an air conditioner start-up condition of the air conditioner and a dehumidifier start-up condition of the dehumidifier are satisfied based on 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, determining 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 startup condition is met; 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.

10. The energy storage system according to claim 9, 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 is 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.

11. An energy storage device comprising the energy storage system according to any one of claims 9 to 10, and configured to execute the thermal management method for the energy storage system according to any one of claims 1 to 8.

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