Thermal regulation method of battery pack and energy storage system

Abstract

The invention discloses a thermal regulation method of a battery pack and an energy storage system, and belongs to the field of energy storage systems. The thermal regulation method of the battery pack comprises the following steps: acquiring a first relation curve of expected charging and discharging power corresponding to the battery pack along with time change; based on the first relation curve, determining a second relation curve of the target temperature corresponding to the battery pack along with time change; on the basis of the second relation curve, the corresponding adjustment duration for adjusting the temperature of the battery pack to the target temperature is determined; and performing thermal regulation on the battery pack based on the regulation duration. According to the thermal regulation method of the battery pack, the energy utilization rate and the working stability of the battery pack can be ensured; and the heat management system does not need to be continuously started for a long time, energy consumption is effectively reduced, and economic efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage systems, and in particular to a thermal regulation method for a battery pack and an energy storage system. Background Art

[0002] As the load on the power grid increases, the role of energy storage systems becomes increasingly important. Energy storage batteries can quickly compensate for grid energy shortages, but their performance is significantly affected by temperature. To ensure their proper operation, thermal management of their temperature is essential. Related technologies typically control the temperature of energy storage batteries in real time within a constant temperature range. However, this method requires the thermal management system to be in continuous operation, which consumes significant energy and affects the economic efficiency of the energy storage system. Furthermore, it is difficult to meet grid demand, impacting users' economic benefits. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a battery pack thermal regulation method and energy storage system that can ensure the energy utilization rate and operating stability of the battery pack. This method does not require the thermal management system to be continuously activated for a long period of time, effectively reducing energy consumption and improving economic efficiency.

[0004] In a first aspect, the present application provides a thermal regulation method for a battery pack, the method comprising:

[0005] Obtain a first relationship curve of expected charge and discharge power corresponding to the battery pack versus time;

[0006] Determining, based on the first relationship curve, a second relationship curve of the target temperature corresponding to the battery pack changing with time;

[0007] determining, based on the second relationship curve, a corresponding adjustment time for adjusting the temperature of the battery pack to the target temperature;

[0008] Based on the adjustment duration, thermal adjustment is performed on the battery pack.

[0009] According to the thermal regulation method of the battery pack of the present application, the target temperature at which the battery pack can operate normally based on the expected charge and discharge power is calculated by the expected charge and discharge power of the battery pack at a future moment, and the regulation time corresponding to the target temperature is determined to thermally regulate the battery pack according to the target temperature. The battery pack can be thermally regulated at the corresponding start time so that it can operate based on the expected charge and discharge power at a temperature matching the expected charge and discharge power, thereby reducing the restriction of temperature on battery capacity, achieving the expected energy transmission, and ensuring the energy utilization rate and working stability of the battery pack; and there is no need for the thermal management system to be kept on for a long time, which effectively reduces energy consumption and improves economic efficiency.

[0010] According to one embodiment of the present application, determining, based on the second relationship curve, a corresponding adjustment time for adjusting the temperature of the battery pack to the target temperature includes:

[0011] The second relationship curve is input into the thermal adjustment time model to obtain the adjustment time corresponding to each target temperature in the second relationship curve output by the thermal adjustment time model; wherein,

[0012] The thermal regulation time model is pre-built according to the architecture information and thermal test data corresponding to the battery pack.

[0013] According to one embodiment of the present application, determining, based on the second relationship curve, a corresponding adjustment time for adjusting the temperature of the battery pack to the target temperature includes:

[0014] calculating, based on the ambient temperature of the battery pack at the determination time, the lowest temperature of each battery cell in the battery pack at the determination time, and the target temperature, an adjustment time for performing a heating operation corresponding to the target temperature;

[0015] Based on the ambient temperature of the battery pack at the determination time, the maximum temperature of each battery cell in the battery pack at the determination time, and the target temperature, an adjustment time for performing a heat dissipation operation corresponding to the target temperature is calculated.

[0016] According to one embodiment of the present application, thermally regulating the battery pack based on the regulation duration includes:

[0017] When the time corresponding to the adjustment time after the determination time is not earlier than the time corresponding to the target temperature, the battery cells are thermally adjusted based on the actual temperature corresponding to each battery cell in the battery pack at the determination time and the target temperature.

[0018] According to one embodiment of the present application, thermally regulating the battery cells based on the actual temperature corresponding to each battery cell in the battery pack and the target temperature at the determination time includes:

[0019] When the difference between the actual temperature and the target temperature is greater than a first preset value, performing a heat dissipation operation on the battery pack corresponding to the actual temperature and continuing the adjustment time corresponding to the target temperature;

[0020] When the difference between the target temperature and the actual temperature is greater than a second preset value, a heating operation is performed on the battery pack corresponding to the actual temperature and continues for an adjustment time corresponding to the target temperature.

[0021] According to one embodiment of the present application, thermally regulating the battery pack based on the regulation duration includes:

[0022] Determining the total thermal regulation power corresponding to the battery packs that need to be temperature regulated based on the number of battery packs that need to be temperature regulated and the regulation duration at the same time;

[0023] Thermally regulate the battery pack based on the total thermal regulation power and the regulation duration.

[0024] According to one embodiment of the present application, the thermally regulating the battery pack based on the total thermal regulation power and the regulation duration includes:

[0025] determining a target quantity based on the supplied power when the supply power provided by the energy device corresponding to the battery pack is less than the total thermal regulation power;

[0026] Based on the adjustment time, the target number of battery packs requiring temperature adjustment having the lowest and / or highest actual temperatures at the determination moment are prioritized for adjustment.

[0027] According to one embodiment of the present application, determining, based on the first relationship curve, a second relationship curve showing a target temperature corresponding to the battery pack changing over time includes:

[0028] Based on the actual state of charge of the battery pack at the time of determination and the expected charge and discharge power corresponding to each time in the first relationship curve, a preset relationship table is queried to determine the target temperature corresponding to the expected charge and discharge power and the actual state of charge at each time.

[0029] According to one embodiment of the present application, obtaining a first relationship curve of expected charge and discharge power corresponding to the battery pack versus time includes:

[0030] Based on grid demand and / or power load demand, obtaining a third relationship curve of expected charge and discharge power corresponding to the energy storage system varying with time;

[0031] Based on the actual state of charge and charge-discharge state of each battery cluster in the energy storage system at the determination time, the expected charge-discharge power corresponding to the energy storage system corresponding to each time in the third relationship curve is allocated to obtain a fourth relationship curve showing the expected charge-discharge power corresponding to each battery cluster changing with time;

[0032] Based on the actual state of charge and charge / discharge state of each battery pack in the battery cluster at the determination time, the expected charge / discharge power corresponding to each time in the fourth relationship curve is allocated to obtain the first relationship curve corresponding to each battery pack.

[0033] In a second aspect, the present application provides a thermal regulation device for a battery pack, the device comprising:

[0034] A first processing module is used to obtain a first relationship curve of expected charge and discharge power corresponding to the battery pack changing with time;

[0035] a second processing module, configured to determine, based on the first relationship curve, a second relationship curve showing a change in the target temperature corresponding to the battery pack over time;

[0036] a third processing module, configured to determine, based on the second relationship curve, a regulation time corresponding to regulating the temperature of the battery pack to the target temperature;

[0037] A fourth processing module is configured to perform thermal regulation on the battery pack based on the regulation duration.

[0038] According to the thermal regulation device of the battery pack of the present application, the target temperature at which the battery pack can operate normally based on the expected charge and discharge power at a future moment is calculated, and the regulation time corresponding to the target temperature is determined to regulate the battery pack according to the target temperature. The battery pack can be thermally regulated at the corresponding start time so that it can operate based on the expected charge and discharge power at a temperature matching the expected charge and discharge power, thereby reducing the restriction of temperature on battery capacity, achieving the expected energy transmission, and ensuring the energy utilization rate and working stability of the battery pack; and there is no need for the thermal management system to be kept on for a long time, which effectively reduces energy consumption and improves economic efficiency.

[0039] In a third aspect, the present application provides an energy storage system, comprising:

[0040] at least one battery cluster, the battery cluster comprising at least one battery pack;

[0041] Temperature regulating device;

[0042] A control unit is electrically connected to the temperature regulating device and is used to execute the thermal regulation method of the battery pack as described in the first aspect.

[0043] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the thermal regulation method for the battery pack as described in the first aspect above.

[0044] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the thermal regulation method of the battery pack as described in the first aspect above.

[0045] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0046] By calculating the target temperature at which the battery pack can operate normally based on the expected charge and discharge power at a future moment, the target temperature is calculated. The adjustment time corresponding to the target temperature is determined according to the target temperature to thermally adjust the battery pack. The battery pack can be thermally adjusted at the corresponding start time so that it can operate based on the expected charge and discharge power at a temperature that matches the expected charge and discharge power, thereby reducing the restriction of temperature on battery capacity, achieving the expected energy transmission, and ensuring the energy utilization rate and working stability of the battery pack. There is no need for the thermal management system to be kept on for a long time, which effectively reduces energy consumption and improves economic efficiency.

[0047] Furthermore, by determining the first relationship curve based on the grid demand and / or the power load demand, the power demand can be intelligently identified, and the expected charge and discharge power corresponding to the future moment can be adaptively adjusted according to the power demand, thereby meeting the grid and power load demand. This has high accuracy, can be predicted in advance, and has good timeliness.

[0048] Furthermore, by judging whether the moment corresponding to the adjustment time after the judgment moment reaches the moment corresponding to the target temperature, it is judged whether the current judgment moment is the start moment of thermal regulation, which can achieve accurate judgment of the start moment of thermal regulation, thereby achieving accurate control of the on and off state of the thermal management system, so that the thermal management system can reasonably adjust the battery temperature without being continuously turned on, so that the battery maintains the corresponding target temperature at each time and operates normally based on the expected charge and discharge power corresponding to the time, reducing the temperature constraint of the battery, and effectively reducing the energy loss of the thermal management system, improving battery utilization and economic efficiency.

[0049] Furthermore, by prioritizing thermal regulation of battery packs with higher and / or lower temperatures based on the power supplied by the energy device when energy supply is insufficient, it is possible to maximize external energy utilization while meeting electricity demand as much as possible and reducing the limitations of temperature on battery capacity, while improving battery performance, increasing the economic benefits of the energy storage system, and extending battery life.

[0050] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0052] Figure 1 1 is a flow chart of a thermal regulation method for a battery pack provided in an embodiment of the present application;

[0053] Figure 2 This is one of the structural diagrams of the energy storage system provided in the embodiment of the present application;

[0054] Figure 3 This is the second structural diagram of the energy storage system provided in the embodiment of the present application;

[0055] Figure 4 Schematic diagram of the structure of the thermal regulation device of the battery pack provided in an embodiment of the present application;

[0056] Figure 5 It is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0058] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0059] Below, in conjunction with the accompanying drawings, the thermal regulation method of the battery pack, the thermal regulation device of the battery pack, the electronic device and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0060] The thermal regulation method of the battery pack may be applied to a terminal, and may be specifically executed by hardware or software in the terminal.

[0061] The thermal regulation method for a battery pack provided in an embodiment of the present application may be executed by an electronic device or a functional module or functional entity in the electronic device that can implement the thermal regulation method for the battery pack. The electronic devices mentioned in the embodiment of the present application include but are not limited to mobile phones, tablet computers, computers, cameras, and wearable devices. The thermal regulation method for a battery pack provided in an embodiment of the present application is described below using an electronic device as an example of the execution subject.

[0062] like Figure 1As shown, the thermal regulation method of the battery pack includes: step 110, step 120, step 130 and step 140.

[0063] Step 110: Obtain a first relationship curve of expected charge and discharge power corresponding to the battery pack versus time;

[0064] In this step, the horizontal axis of the first relationship curve is time, and the vertical axis is the expected charge and discharge power of the battery pack; wherein, the expected charge and discharge power of the battery pack is the charge and discharge power that the battery pack should reach when it can meet the grid demand or load demand at the corresponding time.

[0065] The determination time may be a time that changes with time, such as the current time. Taking the determination time as the current collection time as an example, the multiple times in the first relationship curve may be multiple future times arranged in chronological order after the current collection time.

[0066] The expected charge and discharge power can be predicted based on grid demand and power load demand, or can be customized by the user.

[0067] It is understandable that the energy storage system includes at least one battery cluster, each battery cluster includes at least one battery pack, each battery pack includes at least one battery cell, and the battery cells can be connected in series or in parallel. Figure 2 The system architecture of an energy storage system is illustrated in this example. The battery assembly unit (BAU) is used to perform overall control of at least some battery clusters; the battery control unit (BCU) is set in a one-to-one correspondence with the battery clusters and is used to manage and control individual battery clusters; and the battery management unit (BMU) is set in a one-to-one correspondence with the battery packs and is used to manage and control individual battery packs.

[0068] In the actual implementation process, continue to refer to Figure 2 , BMU manages each battery cell in a single battery pack; BCU is connected to one or more BMUs, and BCU is used to manage n BMUs (n≥1); BAU is connected to one or more BCUs, and BAU is used to manage i BCUs (i≥1). One BAU can cooperate with one or more inverter systems (PCS), and the top layer is equipped with k energy management systems (EMS) and j battery cell monitoring units (CMU) to manage data and system energy, and finally communicate with the cloud.

[0069] In some embodiments, the energy storage system may be configured with components in a system architecture according to actual conditions. The component names only represent the functions of the components and have no strong correlation with whether the components have independent hardware.

[0070] In some embodiments, step 110 may include:

[0071] Based on grid demand and / or power load demand, obtaining a third relationship curve of expected charge and discharge power corresponding to the energy storage system varying with time;

[0072] Based on the actual state of charge and charge / discharge state of each battery cluster in the energy storage system at the determination time, the expected charge / discharge power corresponding to the energy storage system corresponding to each time in the third relationship curve is allocated to obtain a fourth relationship curve showing the expected charge / discharge power corresponding to each battery cluster changing with time;

[0073] Based on the actual state of charge and charge and discharge state of each battery pack in the battery cluster at the determination time, the expected charge and discharge power corresponding to each time in the fourth relationship curve is allocated to obtain the first relationship curve corresponding to each battery pack.

[0074] In this embodiment, the abscissa of the third relationship curve is time, and the ordinate is the expected charge and discharge power of the energy storage system; wherein, the expected charge and discharge power of the energy storage system is the charge and discharge power that the energy storage system should achieve to meet the grid demand or load demand at the corresponding time.

[0075] In some embodiments, the third relationship curve may be expressed as: Tch=[Tch0, Tch1, ...], Pch=[Pch0, Pch1, ...], where Tch is a time sequence, and Pch is a desired charge and discharge power sequence corresponding to the energy storage system.

[0076] The electricity load demand may include but is not limited to: electricity usage habits, season, the region where the electricity user is located, and the type of electricity user, such as home, shopping mall or factory.

[0077] In some embodiments, the electrical load demand may also be a demand manually input by a user.

[0078] In some embodiments, based on a pre-trained artificial intelligence model, the grid demand and / or power load demand can be used as input features to predict the expected charge and discharge power of the energy storage system corresponding to multiple subsequent time points, thereby obtaining a third relationship curve.

[0079] The charge and discharge state includes: charging state or discharging state.

[0080] After obtaining the third relationship curve, for each time point, the energy storage system's expected charge and discharge power corresponding to that time point is allocated to each battery cluster using an energy storage balancing control algorithm based on the actual state of charge and charge and discharge state of each battery cluster in the energy storage system at the time point of determination. This yields the expected charge and discharge power of each battery cluster at that time point. A fourth relationship curve is then derived, with time as the horizontal axis and the expected charge and discharge power of the battery cluster at that time as the vertical axis. This allows each battery cluster to achieve balanced control while still meeting grid demand and / or power load demand.

[0081] In some embodiments, the following control algorithm may be used for power allocation.

[0082] In the charging state, the expected charging power of the battery cluster at the target time = (100% - SOC) * Pch, where SOC is the actual state of charge of the battery cluster and Pch is the expected charging power of the energy storage system at the target time.

[0083] In the discharge state, the expected discharge power of the battery cluster at the target time = SOC*Pch, where SOC is the actual state of charge of the battery cluster and Pch is the expected discharge power of the energy storage system at the target time.

[0084] Of course, in other embodiments, other balancing control algorithms may be used for power distribution, which may be configured accordingly based on actual conditions, and this application does not limit this.

[0085] After obtaining the fourth relationship curve, for each time point, the expected charge and discharge power of the battery cluster corresponding to that time point is allocated to each battery pack using the energy storage balancing control algorithm based on the actual state of charge and charge and discharge state of each battery pack in the battery cluster at the time of determination. This results in the expected charge and discharge power of each battery pack at that time point. The first relationship curve is then obtained, with time as the horizontal axis and the expected charge and discharge power of the battery pack at that time as the vertical axis. This allows each battery pack to achieve balanced control while meeting the grid demand and / or power load demand. The specific power allocation method is similar to that for the battery cluster and is not detailed here.

[0086] According to the thermal regulation method of the battery pack provided in the embodiment of the present application, the first relationship curve is determined by the grid demand and / or the power load demand, and the power demand can be intelligently identified, and the expected charge and discharge power corresponding to the future moment can be adaptively adjusted according to the power demand, so as to meet the grid and power load demand. It has high accuracy, can be predicted in advance, and has good timeliness.

[0087] Step 120: Based on the first relationship curve, determine a second relationship curve showing the target temperature of the battery pack changing with time.

[0088] In this step, the horizontal axis of the second relationship curve is time, and the vertical axis is the target temperature that the battery pack should be at at the corresponding time. The target temperature is a temperature that can ensure that the battery pack can operate normally at the expected charge and discharge power corresponding to the time.

[0089] The target temperature can be a value or a temperature range.

[0090] During the actual execution process, a pre-trained network model can be used to predict the target temperature based on the expected charge and discharge power corresponding to the battery pack.

[0091] In some embodiments, the second relationship curve corresponding to the charging state can be expressed as: Tch=[Tch0, Tch1, ...], TEMPch=[TEMPch0, TEMPch1, ...]; where Tch is the charging time sequence; TEMPch is the target temperature sequence corresponding to the charging state.

[0092] The corresponding second relationship curve under the discharge state can be expressed as: Tdch=[Tdch0, Tdch1, ...], TEMPdch=[TEMPdch0, TEMPdch1, ...]; wherein Tdch is the discharge time sequence; and TEMPdch is the target temperature sequence corresponding to the discharge state.

[0093] In some embodiments, step 120 may include:

[0094] Based on the actual state of charge of the battery pack at the time of determination and the expected charge and discharge power corresponding to each time in the first relationship curve, a preset relationship table is queried to determine the target temperature corresponding to the expected charge and discharge power and the actual state of charge at each time.

[0095] In this embodiment, a preset relationship table is used to represent the relationship between state of charge, charge and discharge power, and temperature. Based on the expected charge and discharge power (or expected rate) and the actual state of charge, the corresponding target temperature can be obtained by looking up the table. In actual execution, after obtaining the first relationship curve, the target temperature corresponding to each time node in the first relationship curve can be obtained based on the expected charge and discharge power in the first relationship curve and the actual state of charge of the battery pack, thereby obtaining the second relationship curve.

[0096] In some embodiments, the target temperature can be calculated according to the following formula: T = f(MAP, SOC, Power or Rate), where T is the target temperature, MAP is a preset relationship table, SOC is the actual state of charge, Power is the expected charge and discharge power, and Rate is the expected rate. The expected charge and discharge power and the expected rate can be converted to each other.

[0097] Step 130: Determine, based on the second relationship curve, a corresponding adjustment time for adjusting the temperature of the battery pack to the target temperature;

[0098] In this step, the adjustment time is the time required from the start time of adjustment to the target temperature, used to adjust the temperature of the battery pack from the actual temperature at the determination time to the target temperature under the corresponding charge and discharge state of the battery pack.

[0099] Temperature regulation may include heating or cooling.

[0100] In some embodiments, the adjustment duration can be obtained through simulation calculation of a simulation model.

[0101] In some embodiments, step 130 may include:

[0102] The second relationship curve is input into the thermal adjustment time model to obtain the adjustment time corresponding to each target temperature in the second relationship curve output by the thermal adjustment time model.

[0103] In this embodiment, the thermal regulation time model is a mathematical model pre-constructed based on the architecture information and thermal test data corresponding to the battery pack. The input parameter of the thermal regulation model is the second relationship curve, and the output is the regulation time corresponding to each time node in the second relationship curve.

[0104] The architecture information includes but is not limited to: battery pack shape, battery pack structure, battery pack category, and battery pack model.

[0105] The thermal test data is obtained by experimentally testing multiple battery packs with the same architectural information, and the time required for each battery pack to heat or dissipate heat to the set temperature at different starting temperatures.

[0106] In some embodiments, the thermal regulation time model may include a thermal regulation time model corresponding to a series battery cell mode and a thermal regulation time model corresponding to a parallel battery cell mode. Thermal regulation time models corresponding to various connection methods may also include a heat dissipation time model and a heating time model. Different thermal regulation time models may have different corresponding algorithms; in some embodiments, different ambient temperatures may also correspond to different thermal regulation time models. In actual implementation, these models can be fitted separately through experimental testing.

[0107] In some embodiments, a corresponding thermal regulation time model may be selected for calculation based on the connection mode, charge and discharge status, and ambient temperature of each battery cell in the battery pack.

[0108] In some embodiments, step 130 may include:

[0109] Calculating an adjustment time for performing a heating operation corresponding to the target temperature based on the ambient temperature of the battery pack at the determination time, the lowest temperature of each battery cell in the battery pack at the determination time, and the target temperature;

[0110] Based on the ambient temperature of the battery pack at the determination time, the maximum temperature of each battery cell in the battery pack at the determination time, and the target temperature, the adjustment time for performing the heat dissipation operation corresponding to the target temperature is calculated.

[0111] In this embodiment, the temperature adjustment type may be determined based on the target temperature and the actual battery temperature of the battery pack at the determination moment, including heating, heat dissipation, or no adjustment.

[0112] For example, if the target temperature is greater than the actual battery temperature, heating is determined to be required; if the target temperature is less than the actual battery temperature, heat dissipation is determined to be required; if the target temperature is equal to the actual battery temperature, temperature adjustment is determined not to be required.

[0113] The minimum temperature and maximum temperature are the lowest and highest actual temperatures of the battery cells in the battery pack when connected in series.

[0114] Taking series connection and heating as an example, the adjustment time for performing the heating operation can be calculated according to the following formula:

[0115] t=α*(Tmin1-Tmin0) / (β-γ*(Tmin0+Tmin1-δ*T0));

[0116] Among them, Tmin1 is the target temperature that should be reached when heating ends; Tmin0 is the lowest temperature of the battery cell at the judgment moment; T0 is the ambient temperature; α, β, γ and δ are parameters that can be obtained through experimental fitting.

[0117] Therefore, the adjustment time sequence required for heating to the target temperature in the charging state can be calculated as follows: tch = [tch0, tch1, ...];

[0118] In the discharge state, the adjustment time sequence required for heating to the target temperature is: tdch = [tdch0, tdch1, ...].

[0119] The calculation method for heat dissipation is similar and will not be described in detail in this application.

[0120] Continue to refer Figure 2 In the actual implementation process, after the third relationship curve is predicted, it can be sent to the EMS a certain time in advance. The EMS allocates different charging and discharging power demand curves, i.e., the fourth relationship curve, to each BAU and PCS according to the capabilities of each battery cluster managed by each BAU.

[0121] Based on the received fourth relationship curve and the battery cluster SOC uploaded by each BCU under management, the BAU allocates a corresponding charge and discharge power curve, i.e., the first relationship curve, to each BCU;

[0122] The PCS controls the charge and discharge power curve of each battery cluster according to the allocated fourth relationship curve;

[0123] The BCU receives the allocated first relationship curve and sends it to each BMU. The BMU then calculates the second relationship curve of the power demand or rate demand in each charging and discharging time period based on the battery power (Power) MAP or battery rate (Rate) MAP and the current SOC by looking up the table.

[0124] After obtaining the second relationship curve, the BMU determines whether heating, heat dissipation, or no adjustment is required based on the current temperature of the battery pack and the target temperature of charging and discharging.

[0125] The BMU uses a thermal regulation time model to calculate the estimated time curve required to reach the target temperature curve based on the current battery pack temperature and the target temperature for charging and discharging, combined with factors such as thermal management heating or cooling capabilities, heat dissipation, and ambient temperature. The horizontal axis of the estimated time curve is time, and the vertical axis is the adjustment duration corresponding to the time.

[0126] Step 140: Perform thermal regulation on the battery pack based on the regulation duration.

[0127] In this step, thermal regulation includes: heating, heat dissipation or no regulation.

[0128] After calculating the adjustment time, if thermal adjustment is required, the starting time of thermal adjustment can be calculated based on the adjustment time and the next time after the determination time, so that the battery pack can be thermally adjusted from the starting time and the thermal adjustment can be stopped after the adjustment time, so that the temperature of the battery pack reaches the target temperature or near the target temperature at the corresponding time.

[0129] In the present application, the target temperature at which the battery pack can operate normally based on the expected charge and discharge power at a future time is calculated, and an adjustment time corresponding to the target temperature for adjusting the temperature of the battery pack is determined based on the target temperature. The start time of thermal regulation is calculated based on the adjustment time and the time corresponding to the expected charge and discharge power. This allows the start time for enabling thermal regulation to be adaptively adjusted based on changes in the expected charge and discharge power. The battery pack is thermally regulated at the corresponding start time so that it can operate at a temperature matching the expected charge and discharge power based on the expected charge and discharge power, thereby reducing the restriction of temperature on battery capacity, achieving the expected energy transmission, and ensuring the energy utilization rate and operating stability of the battery pack.

[0130] In addition, by adjusting the duration for thermal regulation, the battery pack only needs to be thermally regulated at the calculated starting time of thermal regulation. There is no need to thermally regulate the battery pack before the starting time, thereby pre-regulating the temperature of the battery pack, so that the thermal management system can enter the corresponding working state according to the actual charging and discharging conditions. There is no need for the thermal management system to be turned on for a long time, which effectively reduces energy consumption and further improves the battery utilization rate and economic efficiency of the energy storage system.

[0131] According to the thermal regulation method of the battery pack provided in the embodiment of the present application, the target temperature at which the battery pack can operate normally based on the expected charge and discharge power at a future moment is calculated, and the regulation time corresponding to the target temperature is determined to regulate the temperature of the battery pack to the target temperature, so as to thermally regulate the battery pack. The battery pack can be thermally regulated at the corresponding start time so that it can operate based on the expected charge and discharge power at a temperature matching the expected charge and discharge power, thereby reducing the restriction of temperature on battery capacity, achieving the expected energy transmission, and ensuring the energy utilization rate and working stability of the battery pack; and there is no need for the thermal management system to be kept on for a long time, which effectively reduces energy consumption and improves economic efficiency.

[0132] In some embodiments, step 140 may include:

[0133] When the time corresponding to the adjustment time after the determination time is not earlier than the time corresponding to the target temperature, the battery cells are thermally adjusted based on the actual temperature and the target temperature corresponding to each battery cell in the battery pack at the determination time.

[0134] In this embodiment, the thermal regulation type is determined based on the actual temperature and the target temperature.

[0135] For example, when the BMU determines that the current determination time t0 + the charging heating adjustment time tch is greater than or equal to the time Tch corresponding to the target temperature; or the current determination time t0 + the discharging heating adjustment time tdch is greater than or equal to the time Tdch corresponding to the target temperature, it is determined that the determination time meets the thermal adjustment start time, and the thermal adjustment type can be determined based on the actual temperature and target temperature corresponding to each battery cell in the battery pack. If it is determined that thermal adjustment is required, thermal adjustment can be started.

[0136] When the current judgment moment t0 + charging heating adjustment time tch is less than the target temperature; and the current judgment moment t0 + discharging heating adjustment time tdch is less than the time Tdch corresponding to the target temperature, it is considered that the current judgment moment has not reached the start time of thermal adjustment, then the thermal management system is kept turned off, and continues to judge whether the sum of the new current judgment moment and the adjustment time is greater than or equal to the time corresponding to the target temperature.

[0137] In some embodiments, thermally regulating the battery cells based on the actual temperature and target temperature of each battery cell in the battery pack at the determination time may include:

[0138] When the difference between the actual temperature and the target temperature is greater than a first preset value, performing a heat dissipation operation on the battery pack corresponding to the actual temperature and continuing the adjustment time corresponding to the target temperature;

[0139] When the difference between the target temperature and the actual temperature is greater than a second preset value, a heating operation is performed on the battery pack corresponding to the actual temperature, and the heating operation is continued for an adjustment time period corresponding to the target temperature.

[0140] In this embodiment, the first preset value and the second preset value can be customized based on the user and are used to evaluate the degree of difference between the actual temperature and the target temperature. When the difference between the actual temperature and the target temperature is greater than the first preset value, it is considered that the actual temperature is high and exceeds the optimal temperature of the battery pack based on the expected charge and discharge power, and heat dissipation is required; when the difference between the target temperature and the actual temperature is greater than the second preset value, it is considered that the actual temperature is low and lower than the optimal temperature of the battery pack based on the expected charge and discharge power, and heating is required.

[0141] In some embodiments, when the difference between the actual temperature and the target temperature is less than or equal to a first preset value, and the difference between the target temperature and the actual temperature is less than or equal to a second preset value, it is determined that thermal adjustment is not required.

[0142] For example, when the BMU determines that the current determination time t0 + charging heating adjustment time tch >= the time Tch corresponding to the target temperature or the current determination time t0 + discharging heating adjustment time tdch >= the time Tdch corresponding to the target temperature, the following conditions are met:

[0143] If the actual temperature of the current battery is lower than the second preset target temperature at the time of charging and discharging, it is determined that heating is required. The current BMU uploads a heating request to the BCU to end the heating after heating the battery pack for the corresponding adjusted time.

[0144] If the actual temperature of the current battery is higher than the first preset target temperature at the time corresponding to charging and discharging, it is determined that cooling is required, and the current BMU uploads a cooling request to the BCU to end the heat dissipation after the corresponding adjustment time for the heat dissipation of the battery pack.

[0145] In other cases, it is determined that no adjustment is required, and the current BMU uploads a no-action request to the BCU.

[0146] According to the thermal regulation method of the battery pack provided in the embodiment of the present application, by judging whether the moment corresponding to the adjustment time after the judgment moment reaches the moment corresponding to the target temperature, it is judged whether the current judgment moment is the starting moment of the thermal regulation. Accurate judgment of the starting moment of the thermal regulation can be achieved, thereby achieving accurate control of the on and off state of the thermal management system, so that the thermal management system can reasonably adjust the battery temperature without being continuously turned on, so that the battery maintains the corresponding target temperature at each time and operates normally based on the expected charge and discharge power corresponding to the time, reducing the temperature constraint of the battery, and effectively reducing the energy loss of the thermal management system, improving battery utilization and economic efficiency.

[0147] In some embodiments, step 140 may include:

[0148] Determining the total thermal regulation power corresponding to the battery packs requiring temperature regulation based on the number of battery packs requiring temperature regulation and the regulation duration determined at the same time;

[0149] The battery pack is thermally regulated based on the total thermal regulation power and regulation duration.

[0150] In this embodiment, the number of battery packs that require temperature adjustment can be determined based on the target temperature and actual temperature corresponding to the pack at that time, which will not be described in detail here.

[0151] After determining the number of battery packs that need to be temperature-regulated at the same time and the regulation time, the total thermal regulation power required to achieve the corresponding regulation time for temperature regulation of each battery pack can be calculated. The total thermal regulation power is used to allocate it to the thermal regulation device corresponding to each battery pack that needs to be thermally regulated. The thermal regulation device heats or dissipates heat on the battery pack according to the allocated thermal regulation power, and ends the thermal regulation after the corresponding regulation time.

[0152] During the actual execution process, the BCU determines the thermal management system power supply startup power Pq in real time based on the thermal management results reported by all BMUs, and reports the real-time power required for the thermal management system to the power supply or PCS in real time. The power supply or PCS adjusts the output according to the required power, and adjusts the BMU thermal management startup strategy in real time based on the current PCS or power supply power, and sends a thermal management startup request to each BMU separately to perform thermal regulation on each battery pack that requires thermal regulation.

[0153] In some embodiments, thermally regulating the battery pack based on the total thermal regulation power and the regulation duration may include:

[0154] When the supply power provided by the energy device corresponding to the battery pack is less than the total thermal regulation power, determining the target quantity based on the supply power;

[0155] Based on the adjustment duration, preferentially adjust the target number of battery packs that need temperature adjustment and have the lowest and / or highest actual temperature at the determination moment.

[0156] In this embodiment, the energy device may include a power supply or a PCS, etc.

[0157] The target number is the number of battery packs for which thermal adjustment is preferentially performed.

[0158] The supply power is the total energy supply power that can be provided to the thermal adjustment device to perform the thermal adjustment operation.

[0159] When the supply power is greater than or equal to the total thermal adjustment power, it is considered that the function is sufficient, and thermal adjustment can be performed on all the determined battery packs that need thermal adjustment respectively.

[0160] When the supply power is less than the total thermal adjustment power, it is considered that the function is insufficient, and then thermal adjustment can be preferentially performed on some battery packs.

[0161] In some embodiments, the current total energy supply power can be calculated according to the supply power to obtain the maximum number N of battery packs that can be thermally adjusted, and then N battery packs with low or high actual temperature are preferentially supported for temperature adjustment, N≥0.

[0162] For example, when the power supply cannot support all the battery packs that need to start thermal management due to power derating, or the PCS cannot support all the battery packs that need to start thermal management due to factors such as being off-grid or insufficient light, the BCU preferentially starts one or more battery packs with low or high temperature that restrict battery performance according to the principle of low and high temperature priority of the battery packs.

[0163] Suppose there are currently 10 battery packs that need to start heating or cooling, the power for each battery pack to perform heating is P1, the power for each battery pack to perform cooling is P2, and the supply power at this time is Pm. When Pm < x*P1 + y*P2, x + y = 10, and x is the number of battery packs that need to start heating, y is the number of battery packs that need to start cooling, it is determined that the supply power cannot support the thermal management work of all battery packs; then the BCU calculates a and b that are closest to the distribution of Pm according to a*P1 + b*P2 ≤ Pm, a + b ≤ 10. The BCU preferentially starts a battery packs with low temperature and b battery packs with high temperature that restrict battery performance according to the principle of low and high temperature priority, so as to maximize the utilization of external energy, improve battery performance, increase the economic benefits of the energy storage system, and extend the battery life.

[0164] Of course, in other embodiments, the target number can also be user-defined, and this application does not limit it here.

[0165] According to the thermal regulation method of the battery pack provided in the embodiment of the present application, by preferentially performing thermal regulation on the parts of the battery pack with higher and / or lower temperatures according to the supply power provided by the energy device when the energy supply is insufficient, it is possible to maximize the utilization of external energy on the basis of meeting the power demand as much as possible and reducing the limitation of temperature on the battery capacity, while improving the battery performance, increasing the economic benefits of the energy storage system, and extending the battery life.

[0166] The thermal regulation method for a battery pack provided in the embodiment of the present application can be executed by a thermal regulation device for a battery pack. In the embodiment of the present application, the thermal regulation device for a battery pack is used as an example to illustrate the thermal regulation method for a battery pack.

[0167] An embodiment of the present application also provides a thermal regulation device for a battery pack.

[0168] like Figure 4 As shown, the thermal regulation device of the battery pack includes: a first processing module 410 , a second processing module 420 , a third processing module 430 and a fourth processing module 440 .

[0169] A first processing module 410 is configured to obtain a first relationship curve of expected charge and discharge power corresponding to the battery pack versus time;

[0170] A second processing module 420 is configured to determine a second relationship curve showing a target temperature corresponding to the battery pack changing with time based on the first relationship curve;

[0171] A third processing module 430 is configured to determine, based on the second relationship curve, a corresponding adjustment time for adjusting the temperature of the battery pack to the target temperature;

[0172] The fourth processing module 440 is configured to perform thermal regulation on the battery pack based on the regulation duration.

[0173] According to the thermal regulation device of the battery pack provided in the embodiment of the present application, the target temperature at which the battery pack can operate normally based on the expected charge and discharge power at a future moment is calculated, and the regulation time corresponding to the target temperature is determined to regulate the battery pack according to the target temperature. The battery pack can be thermally regulated at the corresponding start time so that it can operate based on the expected charge and discharge power at a temperature matching the expected charge and discharge power, thereby reducing the restriction of temperature on battery capacity, achieving the expected energy transmission, and ensuring the energy utilization rate and working stability of the battery pack; and there is no need for the thermal management system to be kept on for a long time, which effectively reduces energy consumption and improves economic efficiency.

[0174] In some embodiments, the third processing module 430 may also be used to:

[0175] The second relationship curve is input into the thermal adjustment time model to obtain the adjustment time corresponding to each target temperature in the second relationship curve output by the thermal adjustment time model; wherein,

[0176] The thermal regulation time model is pre-built based on the architecture information and thermal test data corresponding to the battery pack.

[0177] In some embodiments, the third processing module 430 may also be used to:

[0178] Calculating an adjustment time for performing a heating operation corresponding to the target temperature based on the ambient temperature of the battery pack at the determination time, the lowest temperature of each battery cell in the battery pack at the determination time, and the target temperature;

[0179] Based on the ambient temperature of the battery pack at the determination time, the maximum temperature of each battery cell in the battery pack at the determination time, and the target temperature, the adjustment time for performing the heat dissipation operation corresponding to the target temperature is calculated.

[0180] In some embodiments, the fourth processing module 440 may also be used to:

[0181] When the time corresponding to the adjustment time after the determination time is not earlier than the time corresponding to the target temperature, the battery cells are thermally adjusted based on the actual temperature and the target temperature corresponding to each battery cell in the battery pack at the determination time.

[0182] In some embodiments, the fourth processing module 440 may also be used to:

[0183] When the difference between the actual temperature and the target temperature is greater than a first preset value, performing a heat dissipation operation on the battery pack corresponding to the actual temperature and continuing the adjustment time corresponding to the target temperature;

[0184] When the difference between the target temperature and the actual temperature is greater than a second preset value, a heating operation is performed on the battery pack corresponding to the actual temperature, and the heating operation is continued for an adjustment time period corresponding to the target temperature.

[0185] In some embodiments, the fourth processing module 440 may also be used to:

[0186] Determining the total thermal regulation power corresponding to the battery packs requiring temperature regulation based on the number of battery packs requiring temperature regulation and the regulation duration determined at the same time;

[0187] The battery pack is thermally regulated based on the total thermal regulation power and regulation duration.

[0188] In some embodiments, the fourth processing module 440 may also be used to:

[0189] When the supply power provided by the energy device corresponding to the battery pack is less than the total thermal regulation power, determining the target quantity based on the supply power;

[0190] Based on the adjustment duration, priority is given to adjusting the target number of battery packs that require temperature adjustment and have the lowest and / or highest actual temperatures at the time of determination.

[0191] In some embodiments, the second processing module 420 may also be used to:

[0192] Based on the actual state of charge of the battery pack at the time of determination and the expected charge and discharge power corresponding to each time in the first relationship curve, a preset relationship table is queried to determine the target temperature corresponding to the expected charge and discharge power and the actual state of charge at each time.

[0193] In some embodiments, the first processing module 410 may also be used to:

[0194] Based on grid demand and / or power load demand, obtaining a third relationship curve of expected charge and discharge power corresponding to the energy storage system varying with time;

[0195] Based on the actual state of charge and charge / discharge state of each battery cluster in the energy storage system at the determination time, the expected charge / discharge power corresponding to the energy storage system corresponding to each time in the third relationship curve is allocated to obtain a fourth relationship curve showing the expected charge / discharge power corresponding to each battery cluster changing with time;

[0196] Based on the actual state of charge and charge and discharge state of each battery pack in the battery cluster at the determination time, the expected charge and discharge power corresponding to each time in the fourth relationship curve is allocated to obtain the first relationship curve corresponding to each battery pack.

[0197] The thermal regulation device of the battery pack in the embodiment of the present application can be an electronic device or a component of the electronic device, such as an integrated circuit or chip. The electronic device can be a terminal or other devices other than a terminal. For example, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a personal digital assistant (PDA), etc. It can also be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a teller machine or a self-service machine, etc., and the embodiment of the present application does not specifically limit it.

[0198] The thermal regulation device of the battery pack in the embodiment of the present application can be a device having an operating system. The operating system can be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0199] The thermal regulation device of the battery pack provided in the embodiment of the present application can achieve Figure 1 and Figure 2 To avoid repetition, the various processes implemented in the method embodiment are not described here.

[0200] An embodiment of the present application also provides an energy storage system.

[0201] The energy storage system includes: at least one battery cluster, a temperature regulating device and a control unit.

[0202] The battery cluster includes at least one battery pack. Figure 3 The battery pack includes a plurality of battery cells connected in series, a battery management unit (BMU), and a battery collection unit (CSC).

[0203] In some embodiments, one temperature regulating device is provided for each battery pack, and the temperature regulating device may be provided inside the battery pack.

[0204] The temperature adjustment device includes a heating system for performing a heating operation and a heat dissipation system, such as a fan, for performing a heat dissipation operation.

[0205] In some embodiments, the battery pack may further include a balancing system for performing balancing control on each battery cell.

[0206] The control unit is electrically connected to the temperature regulating device and is used to execute the regulating method described in any of the above embodiments.

[0207] In some embodiments, the control unit may include a BMU, a BCU, and a BAU, etc., which respectively execute corresponding control logics. The specific implementation methods have been described in the above embodiments and will not be repeated here.

[0208] According to the energy storage system provided in the embodiment of the present application, the target temperature at which the battery pack can operate normally based on the expected charge and discharge power at a future moment is calculated, and the adjustment time corresponding to the target temperature is determined based on the target temperature to thermally adjust the battery pack. The battery pack can be thermally adjusted at a corresponding start time so that it can operate based on the expected charge and discharge power at a temperature matching the expected charge and discharge power, thereby reducing the restriction of temperature on battery capacity, achieving the expected energy transmission, and ensuring the energy utilization rate and operating stability of the battery pack. There is no need for the thermal management system to be kept on for a long time, which effectively reduces energy consumption and improves economic efficiency.

[0209] In some embodiments, as Figure 5 As shown, an embodiment of the present application also provides an electronic device 500, including a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the program is executed by the processor 501, each process of the above-mentioned thermal regulation method embodiment of the battery pack is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0210] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0211] An embodiment of the present application also provides a non-transitory computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the various processes of the above-mentioned battery pack thermal regulation method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0212] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0213] An embodiment of the present application also provides a computer program product, including a computer program, which implements the above-mentioned thermal regulation method of the battery pack when executed by a processor.

[0214] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0215] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned thermal regulation method embodiment of the battery pack, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0216] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0217] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0218] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0219] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

[0220] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0221] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A thermal regulation method for a battery pack, characterized in that: include: Obtain a first relationship curve of expected charge and discharge power corresponding to the battery pack versus time; Determining, based on the first relationship curve, a second relationship curve of the target temperature corresponding to the battery pack changing with time; determining, based on the second relationship curve, a corresponding adjustment time for adjusting the temperature of the battery pack to the target temperature; Based on the adjustment duration, thermal adjustment is performed on the battery pack.

2. The thermal regulation method of the battery pack according to claim 1, characterized in that: The determining, based on the second relationship curve, a corresponding adjustment time for adjusting the temperature of the battery pack to the target temperature includes: The second relationship curve is input into the thermal adjustment time model to obtain the adjustment time corresponding to each target temperature in the second relationship curve output by the thermal adjustment time model; wherein, The thermal regulation time model is pre-built according to the architecture information and thermal test data corresponding to the battery pack.

3. The thermal regulation method of the battery pack according to claim 1, characterized in that: The determining, based on the second relationship curve, a corresponding adjustment time for adjusting the temperature of the battery pack to the target temperature includes: calculating, based on the ambient temperature of the battery pack at the determination time, the lowest temperature of each battery cell in the battery pack at the determination time, and the target temperature, an adjustment time for performing a heating operation corresponding to the target temperature; Based on the ambient temperature of the battery pack at the determination time, the maximum temperature of each battery cell in the battery pack at the determination time, and the target temperature, an adjustment time for performing a heat dissipation operation corresponding to the target temperature is calculated.

4. The thermal regulation method of a battery pack according to any one of claims 1 to 3, characterized in that: The thermally regulating the battery pack based on the regulation duration includes: When the time corresponding to the adjustment time after the determination time is not earlier than the time corresponding to the target temperature, the battery cells are thermally adjusted based on the actual temperature corresponding to each battery cell in the battery pack at the determination time and the target temperature.

5. The thermal regulation method of the battery pack according to claim 4, characterized in that: The thermally regulating the battery cells based on the actual temperature corresponding to each battery cell in the battery pack and the target temperature at the determination moment includes: When the difference between the actual temperature and the target temperature is greater than a first preset value, performing a heat dissipation operation on the battery pack corresponding to the actual temperature and continuing the adjustment time corresponding to the target temperature; When the difference between the target temperature and the actual temperature is greater than a second preset value, a heating operation is performed on the battery pack corresponding to the actual temperature and continues for an adjustment time corresponding to the target temperature.

6. The thermal regulation method for a battery pack according to any one of claims 1 to 3, characterized in that: The thermally regulating the battery pack based on the regulation duration includes: Determining the total thermal regulation power corresponding to the battery packs that need to be temperature regulated based on the number of battery packs that need to be temperature regulated and the regulation duration at the same time; Thermally regulate the battery pack based on the total thermal regulation power and the regulation duration.

7. The thermal regulation method of the battery pack according to claim 6, characterized in that: The thermally regulating the battery pack based on the total thermal regulation power and the regulation duration includes: determining a target quantity based on the supplied power when the supply power provided by the energy device corresponding to the battery pack is less than the total thermal regulation power; Based on the adjustment time, the target number of battery packs requiring temperature adjustment having the lowest and / or highest actual temperatures at the time of adjustment determination are given priority.

8. The thermal regulation method for a battery pack according to any one of claims 1 to 3, characterized in that: Determining a second relationship curve of the target temperature corresponding to the battery pack changing over time based on the first relationship curve includes: Based on the actual state of charge of the battery pack at the time of determination and the expected charge and discharge power corresponding to each time in the first relationship curve, a preset relationship table is queried to determine the target temperature corresponding to the expected charge and discharge power and the actual state of charge at each time.

9. The thermal regulation method for a battery pack according to any one of claims 1 to 3, characterized in that: The obtaining of a first relationship curve of expected charge and discharge power corresponding to the battery pack versus time includes: Based on grid demand and / or power load demand, obtaining a third relationship curve of expected charge and discharge power corresponding to the energy storage system varying with time; Based on the actual state of charge and charge-discharge state of each battery cluster in the energy storage system at the determination time, the expected charge-discharge power corresponding to the energy storage system corresponding to each time in the third relationship curve is allocated to obtain a fourth relationship curve showing the expected charge-discharge power corresponding to each battery cluster changing with time; Based on the actual state of charge and charge / discharge state of each battery pack in the battery cluster at the determination time, the expected charge / discharge power corresponding to each time in the fourth relationship curve is allocated to obtain the first relationship curve corresponding to each battery pack.

10. A thermal regulation device for a battery pack, characterized in that: include: A first processing module is used to obtain a first relationship curve of expected charge and discharge power corresponding to the battery pack changing with time; a second processing module, configured to determine, based on the first relationship curve, a second relationship curve showing a change in the target temperature corresponding to the battery pack over time; a third processing module, configured to determine, based on the second relationship curve, a regulation time corresponding to regulating the temperature of the battery pack to the target temperature; A fourth processing module is configured to perform thermal regulation on the battery pack based on the regulation duration.

11. An energy storage system, characterized in that: include: at least one battery cluster, the battery cluster comprising at least one battery pack; Temperature regulating device; A control unit is electrically connected to the temperature regulating device and is used to execute the thermal regulation method of the battery pack according to any one of claims 1 to 9.

12. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the thermal regulation method for the battery pack as described in any one of claims 1 to 9 is implemented.

13. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 9 is implemented.

Images