Temperature control method, device and equipment of energy storage system and storage medium

Abstract

The invention belongs to the technical field of lithium batteries, and discloses a temperature control method, device and equipment for an energy storage system and a storage medium, and the temperature control method comprises the steps: obtaining the target temperature of a battery cluster; when the target temperature meets a first triggering condition, outputting temperature adjusting airflow to the battery cluster; obtaining the temperature of each battery module in the battery cluster; determining a target airflow velocity corresponding to a target battery module according to the temperature of the target battery module in the battery cluster; accelerating the temperature-adjusting air flow for adjusting the temperature of the target battery module until the air flow speed of the temperature-adjusting air flow reaches the target air flow speed; and when the target temperature meets a second trigger condition, stopping outputting the temperature-adjusting airflow and stopping accelerating the temperature-adjusting airflow. The problems that in the prior art, due to the temperature difference adjusting mode of an energy storage system, the temperature difference between the battery modules is large, and the power consumption of a temperature control system is large are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium batteries, and specifically relates to a temperature control method, device, equipment and storage medium for an energy storage system. Background Art

[0002] The energy storage system is usually a battery cluster composed of dozens of battery modules installed on a battery rack, and the temperature control system of the energy storage system is mainly composed of fans and industrial air conditioners installed in the battery modules to ensure that the energy storage batteries operate within the optimal temperature range.

[0003] The target temperature of industrial air conditioning control is set at an optimal temperature T0, and then the temperature is automatically controlled according to the deviation between the real-time temperature of the energy storage battery and the optimal temperature T0. When the real-time temperature of the energy storage battery is higher than the optimal temperature T0, the air conditioning is operated for cooling, and when the real-time temperature of the energy storage battery is lower than the optimal temperature T0, the air conditioning is operated for heating. In battery modules, the temperature difference between each battery module is usually adjusted by adding a fan, but the current control of the fan cannot solve the problem of large temperature difference between each battery module, which affects the working stability of the battery module, and the temperature control system consumes more power by setting the optimal temperature to control the fan to adjust the temperature difference. Summary of the invention

[0004] The present invention provides a temperature control method, device, equipment and storage medium for an energy storage system, which are used to solve the problem that the temperature difference adjustment method of the energy storage system in the prior art causes a large temperature difference between each battery module and causes a large power consumption of the temperature control system.

[0005] In order to solve the above technical problems, in a first aspect, the present invention provides a temperature control method for an energy storage system, comprising:

[0006] Get the target temperature of the battery cluster;

[0007] When the target temperature meets a first trigger condition, outputting a temperature-regulated airflow to the battery cluster;

[0008] Acquiring the temperature of each battery module in the battery cluster;

[0009] Determining a target airflow velocity corresponding to the target battery module according to the temperature of the target battery module in the battery cluster;

[0010] Accelerating the temperature-adjusting airflow for adjusting the temperature of the target battery module until the airflow velocity of the temperature-adjusting airflow reaches the target airflow velocity;

[0011] Until the target temperature satisfies a second trigger condition, outputting the temperature-adjusted airflow is stopped and acceleration of the temperature-adjusted airflow is stopped.

[0012] Optionally, the step of accelerating the temperature-adjusting airflow for adjusting the temperature of the target battery module until the airflow velocity of the temperature-adjusting airflow reaches the target airflow velocity includes:

[0013] Controlling the air flow speed by means of a pulse width modulation (PWM) signal;

[0014] Determining a target duty cycle of the PWM signal corresponding to the target airflow velocity;

[0015] The duty cycle corresponding to the airflow velocity of the temperature-adjusted airflow is adjusted to reach the target duty cycle.

[0016] Optionally, after controlling the airflow speed by using a PWM signal and before determining a target duty cycle of the PWM signal corresponding to the target airflow speed, the method further includes:

[0017] Based on the correspondence between the airflow velocity and the duty cycle, determining a first value range of the airflow velocity and a second value range of the duty cycle having a linear correspondence;

[0018] The duty cycle of the PWM signal is controlled to be within a maximum value range in the second value range.

[0019] Optionally, the corresponding relationship between the air flow velocity and the duty cycle is determined by the following formula:

[0020]

[0021] Among them, k1 is the first proportional coefficient, k2 is the second proportional coefficient, k3 is the third proportional coefficient, k4 is the fourth proportional coefficient, D is the duty cycle, D1 is the first duty cycle, D2 is the second duty cycle, D3 is the third duty cycle, D4 ​​is the fourth duty cycle, and V is the air flow velocity.

[0022] Optionally, determining a target airflow velocity corresponding to the target battery module according to the temperature of the target battery module in the battery cluster includes:

[0023] Determine a first range of a maximum value range in the second value range;

[0024] Determine a second extreme difference in the temperature variation range of all battery modules in the battery cluster;

[0025] Taking a first ratio of the first range difference to the second range difference as a proportionality coefficient, determining a first change amount of the duty cycle corresponding to a change in the temperature of the target battery module according to the proportionality coefficient;

[0026] The airflow speed corresponding to the first change in the duty cycle is determined as the target airflow speed.

[0027] Optionally, taking a first ratio of the first range to the second range as a proportionality coefficient includes:

[0028] Regulating the change in the duty cycle, and observing the change in the temperature of the battery cell module corresponding to the change in the duty cycle;

[0029] When the change in the temperature of the battery cell module is within a preset threshold range, determining a second change in the duty cycle corresponding to the current change in the temperature of the battery cell module;

[0030] The maximum value of the first change amount and the first ratio is used as a proportionality coefficient.

[0031] In a second aspect, the present invention provides a temperature control device for an energy storage system, comprising:

[0032] A first acquisition module, used to acquire a target temperature of the battery cluster;

[0033] a first output module, configured to output a temperature-regulated airflow to the battery cluster when the target temperature meets a first trigger condition;

[0034] A second acquisition module, used to acquire the temperature of each battery module in the battery cluster;

[0035] A determination module, configured to determine a target airflow velocity corresponding to the target battery module according to the temperature of the target battery module in the battery cluster, wherein a change in the airflow velocity is proportional to a change in the temperature of the battery module;

[0036] an acceleration module, used for accelerating the temperature-adjusting airflow for adjusting the temperature of the target battery module until the airflow velocity of the temperature-adjusting airflow reaches the target airflow velocity;

[0037] The second output module is used to stop outputting the temperature-adjusted airflow and stop accelerating the temperature-adjusted airflow until the target temperature satisfies a second trigger condition.

[0038] In a third aspect, the present invention provides a temperature control device for an energy storage system, including a memory and a processor, wherein:

[0039] The memory is used to store computer programs;

[0040] The processor is used to read the program in the memory and execute the steps of the temperature control method of the energy storage system provided in the first aspect above.

[0041] In a fourth aspect, the present invention provides a computer-readable storage medium having a readable computer program stored thereon, which, when executed by a processor, implements the steps of the temperature control method for an energy storage system as provided in the first aspect above.

[0042] Compared with the prior art, the temperature control method of an energy storage system provided by the present invention has the following beneficial effects:

[0043] In the present invention, when the target temperature of the battery cluster meets the first trigger condition, the airflow speed (target airflow speed) corresponding to the temperature of each battery module (target battery module) in the battery cluster is determined. In this way, outputting the corresponding airflow speed for each battery module can make the battery module reach its own appropriate temperature, so that each battery module can reach the expected temperature. Compared with all battery modules in the battery cluster outputting the same airflow speed, which causes some battery modules to exceed or fall below the expected temperature, the temperature difference between the battery modules can be smaller. In addition, outputting the corresponding airflow speed for each battery module can avoid the problem that when a certain battery module requires a larger airflow speed, all battery modules use a larger airflow speed, resulting in a higher power consumption of the temperature control system of the battery cluster.

[0044] Furthermore, in the present invention, the temperature control of the battery cluster is started when the target temperature of the battery cluster meets the first trigger condition, and the temperature control of the battery cluster is stopped when the target temperature reaches the second trigger condition, so that the battery cluster can be temperature controlled when the temperature range is within the range from the first trigger condition to the second trigger condition. Compared with starting the temperature control directly at the second trigger condition, which causes the temperature control system to adjust the temperature for the time period from the second trigger condition to the first trigger condition (i.e., the temperature control time period is the second trigger condition-the first trigger condition-the second trigger condition), this can effectively reduce the energy consumption of the acceleration device used to accelerate the temperature control airflow, that is, it can reduce the energy consumption of the temperature control system.

[0045] In summary, the present invention can solve the problem in the prior art that the temperature difference adjustment method of the energy storage system causes a large temperature difference between each battery module and causes a large power consumption of the temperature control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present invention, rather than all of the embodiments. For ordinary technicians in this field, without paying creative work, other drawings obtained based on these drawings all fall within the scope of protection of the present invention.

[0047] Figure 1 is a flow chart of a temperature control method for an energy storage system provided by an embodiment of the present invention;

[0048] Figure 2 is a flow chart of another temperature control method for an energy storage system provided by an embodiment of the present invention;

[0049] Figure 3 is a structural diagram of a temperature control device for an energy storage system provided by an embodiment of the present invention;

[0050] Figure 4 is a structural schematic diagram of a temperature control device of an energy storage system provided by an embodiment of the present invention;

[0051] Figure 5 It is a structural schematic diagram of a computer-readable storage medium provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] In order to make the description of the disclosed content more detailed and complete, the following is an illustrative description of the implementation mode and specific examples of the present invention; however, this is not the only form of implementing or applying the specific embodiments of the present invention. The implementation mode covers the features of multiple specific embodiments and the method steps and their sequence for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equal functions and step sequences. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0055] In addition, in the description of the embodiments of the present invention, "multiple" means two or more than two, and other quantifiers are similar and should be understood. The preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In addition, the embodiments of the present invention and the features therein may be combined with each other without conflict.

[0056] It should be noted that the battery cluster of the energy storage system includes multiple battery modules, which are placed on the rack in multiple rows and layers. When adjusting the temperature of the energy storage system, the air conditioner will output hot and cold airflow to cool or heat it, but the temperature will be different in different rows and layers of the battery cluster, resulting in temperature differences between different battery modules in the battery cluster.

[0057] like Figure 1 The flowchart shown is a temperature control method of an energy storage system provided by an embodiment of the present invention, which includes the following steps.

[0058] Step S110, obtaining the target temperature of the battery cluster.

[0059] It should be noted that the target temperature of the battery cluster can be set according to specific needs of the application. For example, the target temperature of the battery cluster can be the average temperature of each battery module in the battery cluster.

[0060] Optionally, when the battery cluster needs to be cooled, the target temperature of the battery cluster can be the maximum temperature of all battery modules in the battery cluster. In this way, when the temperature of the battery cluster is adjusted, the maximum temperature of the battery modules in the battery cluster is adjusted. When the battery module with the maximum temperature in the battery cluster is adjusted to a suitable temperature, naturally the battery modules with other temperatures will also be adjusted to suitable temperatures.

[0061] Optionally, when the battery cluster needs to be heated, the target temperature of the battery cluster may be the minimum temperature of all battery modules in the battery cluster.

[0062] Step S120: When the target temperature meets a first trigger condition, outputting temperature-adjusted airflow to the battery cluster.

[0063] It is understandable that the temperature-adjusting airflow output to the battery cluster can be divided into two types, namely high temperature-adjusting airflow and low temperature-adjusting airflow, wherein the high temperature-adjusting airflow is used to increase the temperature of the battery cluster, and the low temperature-adjusting airflow is used to decrease the temperature of the battery cluster.

[0064] It should be noted that the first trigger condition can be set according to the specific needs of the application. For example, when the battery cluster needs to be cooled down, the first trigger condition can be the maximum temperature that the battery cluster is expected to reach. When the battery cluster needs to be heated up, the first trigger condition can be the minimum temperature that the battery cluster is expected to reach. As a specific example, when the battery cluster needs to be cooled down, the first trigger condition can be 33 degrees Celsius; when the battery cluster needs to be heated up, the first trigger condition can be 11 degrees Celsius.

[0065] It should be noted that the device for outputting temperature-controlled airflow to the battery cluster may be any device capable of achieving this function, such as an air conditioner.

[0066] Step S130, obtaining the temperature of each battery module in the battery cluster.

[0067] Step S140 , determining a target airflow velocity corresponding to the target battery module according to the temperature of the target battery module in the battery cluster.

[0068] It should be noted that in this step, the corresponding relationship between the temperature of the battery module and the airflow speed can be set according to the specific needs of the application. For example, when the battery module needs to be cooled, the higher the temperature of the battery module, the greater the corresponding airflow speed, so that the battery module can be cooled to the expected temperature more quickly.

[0069] Step S150, accelerating the temperature-adjusting airflow for adjusting the temperature of the target battery module until the airflow velocity of the temperature-adjusting airflow reaches the target airflow velocity.

[0070] It should be noted that the method of accelerating the temperature-adjusting airflow may be any feasible method, for example, the temperature-adjusting airflow may be accelerated by controlling the rotation speed of a fan.

[0071] It should be noted that the method for determining whether the airflow velocity of the temperature-adjusted airflow reaches the target airflow velocity may be any feasible method, such as measuring the current airflow velocity by a wind speed sensor.

[0072] Step S160: until the target temperature satisfies a second trigger condition, stop outputting the temperature-adjusted airflow and stop accelerating the temperature-adjusted airflow.

[0073] It should be noted that the second trigger condition can be set according to the specific needs of the application, and is not limited in detail here. For example, when cooling the battery cluster, the second trigger condition may be the final temperature that the battery cluster is expected to reach when cooling; when heating the battery cluster, the second trigger condition may be the final temperature that the battery cluster is expected to reach when heating. As a specific example, when cooling the battery cluster, the second trigger condition may be 30 degrees Celsius; when heating the battery cluster, the second trigger condition may be 15 degrees Celsius.

[0074] In the embodiment of the present invention, when the target temperature of the battery cluster meets the first trigger condition, the airflow speed (target airflow speed) corresponding to the temperature of each battery module (target battery module) in the battery cluster is determined. In this way, outputting the corresponding airflow speed for each battery module can make the battery module reach its own appropriate temperature, so that each battery module can reach the expected temperature. Compared with the situation where all battery modules in the battery cluster output the same airflow speed, resulting in some battery modules exceeding or falling below the expected temperature, the temperature difference between the battery modules can be smaller. In addition, outputting the corresponding airflow speed for each battery module can avoid the problem that when a certain battery module requires a larger airflow speed, all battery modules use a larger airflow speed, resulting in a higher power consumption of the temperature control system of the battery cluster.

[0075] Furthermore, in the embodiment of the present invention, the temperature adjustment of the battery cluster is started when the target temperature of the battery cluster meets the first trigger condition, and the temperature adjustment of the battery cluster is stopped when the target temperature reaches the second trigger condition, so that the battery cluster can be temperature adjusted when the temperature range is within the range from the first trigger condition to the second trigger condition. Compared with starting the temperature adjustment directly at the second trigger condition, which causes the temperature control system to adjust the temperature for the time period from the second trigger condition to the first trigger condition (i.e., the temperature adjustment time period is the second trigger condition-the first trigger condition-the second trigger condition), this can effectively reduce the energy consumption of the acceleration device used to accelerate the temperature adjustment airflow, that is, it can reduce the energy consumption of the temperature control system.

[0076] In summary, the embodiments of the present invention can solve the problem in the prior art that the temperature difference adjustment method of the energy storage system causes a large temperature difference between the battery modules and causes a large power consumption of the temperature control system.

[0077] In an optional implementation, the step of accelerating the temperature-adjusting airflow for adjusting the temperature of the target battery module until the airflow velocity of the temperature-adjusting airflow reaches the target airflow velocity includes:

[0078] Controlling the air flow speed by means of a pulse width modulation (PWM) signal;

[0079] Determining a target duty cycle of the PWM signal corresponding to the target airflow velocity;

[0080] The duty cycle corresponding to the airflow velocity of the temperature-adjusted airflow is adjusted to reach the target duty cycle.

[0081] In this implementation, for a device for regulating air flow speed, the air flow speed can be controlled by a motor of the device, and the air flow speed is controlled by a motor by controlling the motor through a pulse width modulation (PWM) signal.

[0082] As a specific example, the device for controlling the air flow speed is a fan, so the rotation speed of the fan motor can be controlled by a PWM signal to achieve the purpose of controlling the air flow speed by the PWM signal.

[0083] It should be noted that the correspondence between the airflow speed and the duty cycle of the PWM signal can be determined according to the actual environment. For example, first, based on the physical characteristics of the fan or airflow control system, a mathematical model can be established to predict how the duty cycle change affects the motor speed and thus changes the airflow speed. Based on the preliminary relationship, fine-tuning is performed in the specific application scenario, taking into account the influence of actual factors such as temperature, humidity, and system load to achieve a more accurate control effect.

[0084] In this way, when the duty cycle of the PWM signal is controlled to reach the target duty cycle, the airflow speed of the temperature-adjusted airflow can reach the target airflow speed.

[0085] In an optional implementation, Figure 2 The flowchart of another temperature control method of an energy storage system provided by an embodiment of the present invention is shown. After controlling the airflow speed by a PWM signal and before determining the target duty cycle of the PWM signal corresponding to the target airflow speed, the following steps are also included.

[0086] Step S210, based on the correspondence between the airflow velocity and the duty cycle, determining a first value range of the airflow velocity and a second value range of the duty cycle having a linear correspondence relationship;

[0087] Step S220, controlling the duty cycle of the PWM signal to be within a maximum value range in the second value range.

[0088] It can be understood that the duty cycle is in the second value range, which means that when the airflow speed is controlled by the duty cycle of the PWM signal, the airflow speed can change linearly. In this way, when the airflow speed needs to reach the target airflow speed, since the airflow speed and the duty cycle are linearly related, the corresponding duty cycle of the PWM signal can be directly obtained, thereby realizing rapid control of the airflow speed.

[0089] The duty cycle is within the maximum value range of the second value range, which can make the duty cycle variation range large enough, and the natural air flow speed variation range large enough. On this basis, since the corresponding air flow speed is set for the temperature of each battery module to change the temperature difference when the battery cluster is temperature adjusted, it can be understood that the temperature range of the battery module over which the air flow speed can change the temperature difference is also very wide.

[0090] Optionally, the basic calculation formula for heat exchange is: Q = hAΔT, where Q is the heat exchanged, A is the heat exchange area, ΔT is the temperature difference between the wall and the fluid, and h is the forced convection heat transfer coefficient. From this basic calculation formula, it can be understood that when the forced convection heat transfer coefficient increases, the heat exchanged will also increase. The forced convection heat transfer coefficient is proportional to the air flow velocity, that is, the greater the air flow velocity, the greater the forced convection heat transfer coefficient. Therefore, in order to make the exchanged heat sufficient, the air flow velocity can be set larger. Therefore, when determining the duty cycle of the PWM signal, the duty cycle value range can be within the maximum value range, and the minimum value of the duty cycle value range is greater than the minimum value of the maximum value range. As a specific example, for example, the maximum value range can be 40%-80%, so that the minimum value of the duty cycle value range is greater than the minimum value of the maximum value range, and the final duty cycle value range can be set to 50%-80%.

[0091] In an optional implementation, the corresponding relationship between the air flow velocity and the duty cycle is determined by the following formula:

[0092]

[0093] Among them, k1 is the first proportional coefficient, k2 is the second proportional coefficient, k3 is the third proportional coefficient, k4 is the fourth proportional coefficient, D is the duty cycle, D1 is the first duty cycle, D2 is the second duty cycle, D3 is the third duty cycle, D4 ​​is the fourth duty cycle, and V is the air flow velocity.

[0094] It should be noted that the coefficients in the above formula can be determined according to specific measurement results during application and are not limited in detail here.

[0095] In an optional implementation, determining a target airflow velocity corresponding to the target battery module according to the temperature of the target battery module in the battery cluster includes:

[0096] Determine a first range of a maximum value range in the second value range;

[0097] Determine a second extreme difference in the temperature variation range of all battery modules in the battery cluster;

[0098] Taking a first ratio of the first range difference to the second range difference as a proportionality coefficient, determining a first change amount of the duty cycle corresponding to a change in the temperature of the target battery module according to the proportionality coefficient;

[0099] The airflow speed corresponding to the first change in the duty cycle is determined as the target airflow speed.

[0100] It should be noted that the first range is the difference between the maximum value and the minimum value in the maximum value range. The second range is the difference between the temperature of the battery module with the maximum temperature and the temperature of the battery module with the minimum temperature in the battery cluster.

[0101] It should be noted that the first change in the duty cycle that changes with the temperature of the target battery module according to the proportional coefficient is essentially the value obtained by multiplying the temperature of the target battery module by the proportional coefficient. The airflow velocity and the duty cycle change linearly, so that the temperature and the duty cycle change proportionally, and the airflow velocity and the temperature can be linearly related. In this way, in the process of adjusting the temperature of the battery module, the temperature of the battery module can be controlled by controlling the duty cycle to reach a suitable temperature, thereby reducing the temperature difference between the battery modules.

[0102] It should be noted that when the battery cluster needs to be cooled, the proportional coefficient is a positive value, that is, as the temperature increases, the duty cycle needs to increase; when the battery cluster needs to be heated, the proportional coefficient is a negative value, that is, as the temperature increases, the duty cycle needs to decrease.

[0103] As a specific example, the duty cycle value range is set within the range of 50%-80%. When the battery cluster is cooled down, the temperature of the battery module and the duty cycle of its corresponding PWM signal are shown in Table 1; when the battery is heated up, the temperature of the battery module and the duty cycle of its corresponding PWM signal are shown in Table 2.

[0104]

[0105] Table 1

[0106]

[0107] Table 2

[0108] It can be seen from the table that when the battery cluster is cooled, the duty cycle increases by 5% for every degree increase in the temperature of the battery modules in the battery cluster; when the battery cluster is heated, the duty cycle decreases by 5% for every degree increase in the temperature of the battery modules in the battery cluster.

[0109] In an optional implementation, taking a first ratio of the first range to the second range as a proportionality coefficient includes:

[0110] Regulating the change in the duty cycle, and observing the change in the temperature of the battery cell module corresponding to the change in the duty cycle;

[0111] When the change in the temperature of the battery cell module is within a preset threshold range, determining a second change in the duty cycle corresponding to the current change in the temperature of the battery cell module;

[0112] The maximum value of the first change amount and the first ratio is used as a proportionality coefficient.

[0113] It should be noted that the method of observing the change in the temperature of the battery module corresponding to the change in the duty cycle can be any feasible method. For example, the first temperature of the battery module whose duty cycle is at the initial value is detected by a temperature sensor, and then the duty cycle is increased by a certain change on the basis of the initial value to obtain the current value, and the second temperature of the battery module at this time is detected by the temperature sensor, and the change in the temperature of the battery module corresponding to the change in the duty cycle is obtained by subtracting the first temperature from the second temperature.

[0114] It should be noted that the preset threshold range can be set according to the specific needs of the application. For example, it can be 1 degree Celsius to 2 degrees Celsius. That is, when the change in the temperature of the battery cell module is within 1 degree Celsius to 2 degrees Celsius, the second change in the duty cycle corresponding to the change is compared with the first ratio, and the larger change is used as the proportional coefficient.

[0115] It is understandable that when the proportional coefficient is set to a small value, the temperature change of the battery cell module may not be obvious, and the temperature of the battery cell module cannot be effectively regulated. Therefore, in this implementation, the proportional coefficient is made greater than the second change amount, so that when the temperature is changed by the duty cycle, the temperature change can be more obvious.

[0116] In an optional implementation, an embodiment of the present invention provides a battery management system, which includes a battery management unit, a battery cluster management unit and a local control unit. The battery management unit can be connected to a fan, and the speed of the fan can be controlled by outputting a duty cycle of a PWM signal, and the battery management unit can be connected to the battery cluster management unit through a serial peripheral interface (SPI) communication or a controller area network (CAN) communication, and the battery cluster management unit can be connected to the local control unit through CAN communication or network port communication, and the local control unit can be connected to the air conditioner through 485 communication to output a temperature-controlled airflow, and the battery management unit can collect the battery temperature, upload the battery temperature to the battery cluster management unit, and then upload it to the local control unit, the battery cluster management unit can send a duty cycle to the battery management unit to control the fan according to the temperature of the battery module, and the local control unit can control the air conditioner to turn on and off according to the temperature of the battery module, and control the air conditioner to heat or cool.

[0117] Based on the temperature control method of the energy storage system, the embodiment of the present invention provides a temperature control device of the energy storage system, such as Figure 3 As shown, the temperature control device of the energy storage system includes:

[0118] A first acquisition module 310 is used to acquire a target temperature of the battery cluster;

[0119] A first output module 320, configured to output a temperature-controlled airflow to the battery cluster when the target temperature meets a first trigger condition;

[0120] A second acquisition module 330 is used to acquire the temperature of each battery module in the battery cluster;

[0121] A determination module 340, configured to determine a target airflow velocity corresponding to the target battery module according to the temperature of the target battery module in the battery cluster, wherein a change in the airflow velocity is proportional to a change in the temperature of the battery module;

[0122] An acceleration module 350, configured to accelerate the temperature-adjusting airflow for adjusting the temperature of the target battery module until the airflow velocity of the temperature-adjusting airflow reaches the target airflow velocity;

[0123] The second output module 360 ​​is configured to stop outputting the temperature-adjusted airflow and stop accelerating the temperature-adjusted airflow until the target temperature satisfies a second trigger condition.

[0124] For other details about how the modules in the temperature control device of the energy storage system implement the above technical solution, please refer to the description of the temperature control method of the energy storage system provided in the above invention embodiment, which will not be repeated here.

[0125] Based on the above method to improve the temperature control of energy storage system, such as Figure 4 As shown, an embodiment of the present invention further provides a schematic diagram of the structure of a temperature control device for an energy storage system, the temperature control device comprising a processor 41 and a memory 42 coupled to the processor 41. The memory 42 stores a computer program, and when the computer program is executed by the processor 41, the processor 41 executes the steps of the temperature control method for the energy storage system in the above embodiment.

[0126] For other details about how the processor 41 in the temperature control device of the energy storage system implements the above technical solution, please refer to the description of the temperature control method of the energy storage system provided in the above invention embodiment, which will not be repeated here.

[0127] Among them, the processor 41 can also be called a CPU (Central Processing Unit), and the processor 41 may be an integrated circuit chip with signal processing capabilities; the processor 41 can also be a general-purpose processor, DSP (Digital Signal Process), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, among which the general-purpose processor can be a microprocessor or the processor 41 can also be any conventional processor, etc.

[0128] like Figure 5As shown, the embodiment of the present invention also provides a schematic diagram of the structure of a computer-readable storage medium, on which a readable computer program 51 is stored; wherein the computer program 51 can be stored in the above storage medium in the form of a software product, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, magnetic disk or optical disk, ROM (Read-Only Memory), RAM (Random Access Memory) and other media that can store program codes, or terminal devices such as computers, servers, mobile phones, and tablets.

[0129] In the several embodiments provided by the present invention, 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 only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0130] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0131] In addition, each functional module in each embodiment of the present invention may be integrated into a processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may be stored in a computer-readable storage medium.

[0132] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0133] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium), or a semiconductor medium (e.g., an SSD (solid state disk, solid state hard disk)).

[0134] The technical solution provided by the present invention is introduced in detail above. The present invention applies specific examples to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

[0135] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program code.

[0136] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0137] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0138] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0139] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A temperature control method for an energy storage system, characterized in that: include: Get the target temperature of the battery cluster; When the target temperature meets a first trigger condition, outputting a temperature-regulated airflow to the battery cluster; Acquiring the temperature of each battery module in the battery cluster; Determining a target airflow velocity corresponding to the target battery module according to the temperature of the target battery module in the battery cluster; Accelerating the temperature-adjusting airflow for adjusting the temperature of the target battery module until the airflow velocity of the temperature-adjusting airflow reaches the target airflow velocity; Until the target temperature satisfies a second trigger condition, outputting the temperature-adjusted airflow is stopped and acceleration of the temperature-adjusted airflow is stopped.

2. The temperature control method of the energy storage system according to claim 1, characterized in that: The step of accelerating the temperature-adjusting airflow for adjusting the temperature of the target battery module until the airflow velocity of the temperature-adjusting airflow reaches the target airflow velocity includes: Controlling the air flow speed by means of a pulse width modulation (PWM) signal; Determining a target duty cycle of the PWM signal corresponding to the target airflow velocity; The duty cycle corresponding to the airflow velocity of the temperature-adjusted airflow is adjusted to reach the target duty cycle.

3. The temperature control method of the energy storage system according to claim 2, characterized in that: After controlling the airflow speed by the PWM signal and before determining the target duty cycle of the PWM signal corresponding to the target airflow speed, the method further includes: Based on the correspondence between the airflow velocity and the duty cycle, determining a first value range of the airflow velocity and a second value range of the duty cycle having a linear correspondence; The duty cycle of the PWM signal is controlled to be within a maximum value range in the second value range.

4. The temperature control method of the energy storage system according to claim 3, characterized in that: The corresponding relationship between the air flow velocity and the duty cycle is determined by the following formula: Among them, k1 is the first proportional coefficient, k2 is the second proportional coefficient, k3 is the third proportional coefficient, k4 is the fourth proportional coefficient, D is the duty cycle, D1 is the first duty cycle, D2 is the second duty cycle, D3 is the third duty cycle, D4 ​​is the fourth duty cycle, and V is the air flow velocity.

5. The temperature control method of the energy storage system according to claim 3, characterized in that: The step of determining a target airflow velocity corresponding to the target battery module according to the temperature of the target battery module in the battery cluster includes: Determine a first range of a maximum value range in the second value range; Determine a second extreme difference in the temperature variation range of all battery modules in the battery cluster; Taking a first ratio of the first range difference to the second range difference as a proportionality coefficient, determining a first change amount of the duty cycle corresponding to a change in the temperature of the target battery module according to the proportionality coefficient; The airflow speed corresponding to the first change in the duty cycle is determined as the target airflow speed.

6. The temperature control method of the energy storage system according to claim 5, characterized in that: The taking a first ratio of the first range to the second range as a proportionality coefficient comprises: Regulating the change in the duty cycle, and observing the change in the temperature of the battery cell module corresponding to the change in the duty cycle; When the change in the temperature of the battery cell module is within a preset threshold range, determining a second change in the duty cycle corresponding to the current change in the temperature of the battery cell module; The maximum value of the first change amount and the first ratio is used as a proportionality coefficient.

7. A temperature control device for an energy storage system, characterized in that: include: A first acquisition module, used to acquire a target temperature of the battery cluster; a first output module, configured to output a temperature-regulated airflow to the battery cluster when the target temperature meets a first trigger condition; A second acquisition module, used to acquire the temperature of each battery module in the battery cluster; A determination module, configured to determine a target airflow velocity corresponding to the target battery module according to the temperature of the target battery module in the battery cluster, wherein a change in the airflow velocity is proportional to a change in the temperature of the battery module; an acceleration module, used for accelerating the temperature-adjusting airflow for adjusting the temperature of the target battery module until the airflow velocity of the temperature-adjusting airflow reaches the target airflow velocity; The second output module is used to stop outputting the temperature-adjusted airflow and stop accelerating the temperature-adjusted airflow until the target temperature satisfies a second trigger condition.

8. The temperature control device of the energy storage system according to claim 7, characterized in that: The acceleration module is also used for: Controlling the air flow speed by a PWM signal; Determining a target duty cycle of the PWM signal corresponding to the target airflow velocity; The duty cycle corresponding to the airflow velocity of the temperature-adjusted airflow is adjusted to reach the target duty cycle.

9. A temperature control device for an energy storage system, characterized in that: comprising a memory and a processor, wherein: The memory is used to store computer programs; The processor is used to read the computer program in the memory and execute the steps of any temperature control method of the energy storage system as described in claims 1-6.

10. A computer-readable storage medium, characterized in that: A readable computer program is stored thereon, and when the program is executed by a processor, the steps of the temperature control method of any energy storage system as described in claims 1-6 are implemented.

Images