Battery pack heating control method, energy storage system and storage medium

Abstract

This application relates to the field of battery heating technology, and more particularly to a battery pack heating control method, energy storage system, and storage medium. This application determines the battery state of the target heating pack relative to the external power source based on the external current of the external power source and the initial heating current of the target heating pack. When the target heating pack is in a discharged state relative to the external power source, the target heating pack is heated collaboratively by the discharged target heating pack and the external power source, thus meeting the heating requirements of the battery pack and significantly improving the availability and user experience of low-power devices. When the target heating pack is in a non-discharged state relative to the external power source, the initial heating current is increased to determine the final current value used for heating, and the external current is adjusted to the final current value, ensuring that the external power source heats the target heating pack with a final current value that meets safety requirements, while simultaneously considering both battery pack heating efficiency and battery pack heating safety.

Description

Technical Field

[0001] This application relates to the field of battery heating technology, and in particular to a battery pack heating control method, energy storage system and storage medium. Background Technology

[0002] Energy storage devices are already established and mature product designs. To adapt to relatively harsh environments, such as low temperatures, thermal management systems are an essential part of battery management systems. For battery cells, in low-temperature environments, their impedance is higher than at room temperature, affecting their chemical properties. Specifically, the released capacity is less than at room temperature, significantly impacting the user experience. Moreover, prolonged operation in low-temperature environments damages the battery's chemical structure, causing irreversible damage to the cell's lifespan, resulting in exponentially decreasing lifespan and affecting the cell's service life.

[0003] In related technologies, under weak power supply scenarios, the input power of the external power source may remain at a low level for extended periods or intermittently, which may not meet the heating requirements of the battery pack, preventing the battery pack heating from starting and causing the system to enter a waiting state, thus hindering the subsequent charging process. This significantly limits the availability of equipment and the user experience in renewable energy (such as photovoltaic) power supply scenarios. When the external power source is in a state where it can provide sufficient heating energy, heating the heating film of the battery pack with a low current cannot guarantee heating efficiency. If the current exceeds the heating film's tolerance, the safety of the battery pack will be reduced. Summary of the Invention

[0004] In view of this, one objective of the embodiments of this application is to provide a battery pack heating control method, energy storage system and storage medium to solve the technical problem in the related art that battery pack heating cannot simultaneously take into account heating efficiency and safety.

[0005] In a first aspect, embodiments of this application provide a battery pack heating control method, comprising: determining candidate battery packs that need to be heated from among multiple battery packs based on their current operating temperatures and state of charge values; determining the battery state of a target heating pack relative to an external power source based on the external current of an external power source and the initial heating current of a target heating pack, wherein the target heating pack is any one of the candidate battery packs, and the battery state includes a discharge state and a non-discharge state, wherein the discharge state is the state corresponding to when the initial heating current is greater than the external current, and the non-discharge state is the state corresponding to when the initial heating current is less than or equal to the external current; responding to the discharge state, determining a target discharge current of a target discharge pack based on the initial heating current and the external current, and heating the target heating pack in coordination with the target discharge pack and the external power source based on the target discharge current, wherein the target discharge pack is the battery pack with the largest state of charge value among the multiple battery packs; and responding to the non-discharge state, performing an upgrade operation on the initial heating current of the target heating pack based on the constructed multi-level heating current to determine the final current value, and adjusting the external current to the final current value to heat the target heating pack.

[0006] In some embodiments, the target discharge current of the target discharge pack is determined based on the initial heating current and the external current, and the target heating pack is heated in coordination with the target discharge pack and the external power supply based on the target discharge current, including: determining the target discharge current as the difference between the initial heating current and the external current; forming a parallel branch with the target discharge current and the external current to heat the heating film of the target heating pack.

[0007] In some embodiments, based on the constructed multi-level heating current, the initial heating current of the target heating pack is increased to determine the final current value, including: constructing a multi-level heating current with sequentially increasing current values ​​for the target heating pack, wherein the first level of the multi-level heating current is the initial heating current, and the second level of the multi-level heating current is the final heating current. The heating current of the first stage is less than or equal to the current value corresponding to the rated power of the heating film of the target heating pack, and the second stage heating current is less than or equal to the current value corresponding to the rated power of the heating film of the target heating pack. The initial heating current is the product of a preset multiple and the first heating current; the initial heating current is adjusted from the first heating current to the next... The system performs a current-level-up operation for each heating current level. After each level-up operation, if the current heating current of the target heating element is greater than the external current, a current-level-down operation is performed to determine the final current value. If no current-level-down operation is performed during the current-level-up operation, then the final current value is determined. The heating current is the final value of the current.

[0008] In some embodiments, if the current heating current of the target heating pack is greater than the external current, a current downgrading operation is performed to determine the final current value, including: determining the heating current of the previous heating current as the final current value.

[0009] In some embodiments, constructing multiple heating current levels with sequentially increasing current values ​​for the target heating pack includes: forming a level branch with resistance at each level, and forming a disjoint parallel relationship among multiple level branches; forming a disjoint series relationship between each level branch and the heating film of the target heating pack; and... The gear branches are connected in parallel, and the parallel branches are connected in parallel. Each gear branch is connected in series with the heating film of the target heating pack to form the first... The series branch, the first The series branch corresponds to the first The heating current is set, among which, .

[0010] In some embodiments, the battery pack heating control method further includes: selecting candidate battery packs as target heating packs in ascending order of their coded address numbers.

[0011] In some embodiments, based on the current operating temperature and state of charge (SOC) values ​​of multiple battery packs, candidate battery packs that need to be heated are identified, including: identifying battery packs whose current operating temperature is less than a temperature threshold and whose SOC values ​​are less than the SOC threshold as candidate battery packs.

[0012] In a second aspect, embodiments of this application provide an energy storage system, comprising: multiple battery packs, each battery pack having a heating film disposed thereon; an equalizer and a processor, the equalizer including multiple DAB converters all connected to the processor, each DAB converter also being connected to a heating power line; multiple first switches, the control terminal of each first switch being connected to the processor, the output terminal of each first switch being used to connect a battery pack and a heating power line; multiple second switches, the control terminal of each second switch being connected to the processor, the output terminal of each second switch being used to connect a DAB converter and a battery pack; the processor is used to execute the battery pack heating control method provided in the first aspect, the processor is also used to control the output terminal of a first switch to close, so that a target heating pack connected to the first switch is connected to the heating power line to wait for heating; the processor is also used to control the output terminal of a second switch to close, so that a target discharge pack connected to the second switch transmits energy to the heating power line through the DAB converter connected to the second switch.

[0013] In some embodiments, the energy storage system further includes multiple gear adjustment modules that are matched and connected to multiple battery packs one by one. Each gear adjustment module is connected to a battery pack. Each gear adjustment module includes: multiple gear resistors that can be connected in parallel, each gear resistor having an equal resistance value; multiple third switches, the control terminal of each third switch being connected to a processor, and the output terminal of each third switch being used to connect a heating film of a battery pack to a grounded gear resistor; the processor is also used to control the output terminal of a third switch to close, so that the third switch and the heating film of the battery pack form a series connection; the processor is also used to control the output terminals of multiple third switches to close, so that the multiple gear resistors are connected in parallel and then connected in series with the heating film.

[0014] Thirdly, embodiments of this application provide a computer-readable storage medium storing processor-executable computer program instructions, which, when executed by a processor, cause the processor to perform the battery pack heating control method provided in the first aspect.

[0015] The embodiments of this application have the following beneficial effects: Unlike related technologies, the embodiments of this application determine the battery state of the target heating pack relative to the external power source based on the external current of the external power source and the initial heating current of the target heating pack. When the battery state of the target heating pack relative to the external power source is in a discharging state, the target heating pack is heated collaboratively by the target discharging pack and the external power source. This satisfies the heating requirements of the battery pack and significantly improves the availability and user experience of low-power devices. When the battery state of the target heating pack relative to the external power source is in a non-discharging state, the initial heating current is upgraded to determine the final current value used for heating, and the external current is adjusted to the final current value. This ensures that the external power source heats the target heating pack with a final current value that meets safety requirements. Thus, while ensuring the heating efficiency of the battery pack, the safety of battery pack heating is also taken into account. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the related technologies or embodiments will be briefly introduced below. Obviously, the drawings described below only show some embodiments of this application and should not be considered as limiting the scope of protection. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram illustrating an application scenario of battery pack heating control provided in some embodiments of this application; Figure 2A These are schematic diagrams of the energy storage system provided in some embodiments of this application; Figure 2BThis is another structural schematic diagram of the energy storage system provided in some embodiments of this application; Figure 3 This is a schematic flowchart of a battery pack heating control method provided in some embodiments of this application; Figure 4 This is a schematic diagram of a sub-process of step S33 in the battery pack heating control method provided in some embodiments of this application. Detailed Implementation

[0018] To make the objectives and advantages of the embodiments of this application more readily understood, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The detailed description of the embodiments of this application in the accompanying drawings is not intended to limit the scope of protection claimed by this application, but only represents selected embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] It should be noted that, unless there is a conflict, the various technical features involved in the embodiments of this application described below can be combined with each other, and all are within the protection scope of this application. Furthermore, although functional modules are divided in the device or structural schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. In addition, the terms "first," "second," "third," and other similar expressions used herein do not limit the data or execution order, but are only for illustrative purposes and to distinguish identical or similar items with substantially the same function and effect, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features.

[0020] Unless otherwise defined, the technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. It should be understood that the term "and / or" as used in this specification includes any and all combinations of one or more of the listed items.

[0021] This application provides a battery pack heating control method. By determining the battery state of the target heating pack relative to the external power source based on the external current of the external power source and the initial heating current of the target heating pack, when the target heating pack is in a discharging state relative to the external power source, the target heating pack is heated collaboratively by the discharging target heating pack and the external power source to meet the heating requirements of the battery pack, improving the availability of low-power devices and user experience. When the target heating pack is in a non-discharging state relative to the external power source, the initial heating current is increased to determine the final current value used for heating, and the external current is adjusted to the final current value, ensuring that the external power source heats the target heating pack with a final current value that meets safety requirements. This ensures both the heating efficiency and the safety of the battery pack.

[0022] Please refer to the following: Figure 1 and Figure 2A , Figure 1 The diagram illustrates application scenarios of battery pack heating control provided by some embodiments of this application. Figure 2A The schematic diagram illustrates the structure of an energy storage system provided in some embodiments of this application.

[0023] Combined with reference Figure 1 , Figure 2A and Figure 2B The application scenario includes an energy storage system 100, which can be various suitable types of equipment or devices such as energy storage devices or battery systems.

[0024] Reference Figure 2A and Figure 2B The energy storage system 100 includes multiple (L) battery packs 110, an equalizer 120, a processor 130, multiple (L) first switches 140, multiple (L) second switches 150, and a heating power line 101. Here, L is an integer greater than or equal to 2. Each battery pack 110 is equipped with a heating film 111.

[0025] For example, the equalizer 120 includes multiple (L) DAB converters 121, and all DAB converters 121 are connected to the processor 130. Each DAB converter is also connected to the heating power line 101. The equalizer 120 has fast response and multi-channel time-sharing switching capabilities, which can meet the requirements of fast response and alternating energy transmission.

[0026] The DAB (Dual Active Bridge) converter 121 is a high-frequency isolated, bidirectional DC-DC circuit that utilizes phase-shift control to achieve energy-efficient, isolated transmission. It should be understood that the equalizer 120 can also employ other suitable isolated DC-DC circuits, and this application embodiment does not impose any limitations on this.

[0027] The control terminal of each first switch 140 is connected to the processor 130, and the output terminal of each first switch 140 is used to connect a battery pack 110 and a heating power line 101. It should be understood that the first switch 140 can be any suitable component, including but not limited to a MOSFET, a relay, etc.

[0028] The control terminal of each second switch 150 is connected to the processor 130, and the output terminal of each second switch 150 is used to connect a DAB converter 121 and a battery pack 110. It should be understood that the second switch 150 can be any suitable component, including but not limited to MOSFETs, relays, etc.

[0029] In this embodiment, any battery pack 110 that meets the heating conditions can be used as a target heating pack to be heated. The heating conditions are: the current operating temperature is less than a temperature threshold and the state of charge (SOC) value is less than the SOC threshold. A battery pack 110 that meets the energy release conditions can be used as a target discharge pack, for example, the energy release condition is: the SOC value is the highest among multiple battery packs 110. The processor 130 is used to control the output terminal of the first switch 140 connected to the target heating pack to close, so that the target heating pack is connected to the heating power line 101 to await heating. The processor 130 is also used to control the output terminal of the second switch 150 connected to the target discharge pack to close, so that the target discharge pack transmits energy to the heating power line 101 through the DAB converter 121 connected to the second switch 150. The external power supply 200 is electrically connected to the heating power line 101. When the target heating pack is connected to the heating power line 101 and the external power supply 200 can provide sufficient heating energy, the external power supply 200 transmits energy (electrical energy) to the heating film 111 set on the target heating pack through the heating power line 101, so that the heating film 111 generates heat and heats the target heating pack.

[0030] In this embodiment, when the target heating pack is connected to the heating power line 101 and the external power supply 200 cannot provide sufficient heating energy, the target discharge pack transmits energy (electrical energy) to the heating power line 101 through the DAB converter 121. This, together with the external power supply 200, transmits energy (electrical energy) to the heating film 111 disposed on the target heating pack through the heating power line 101, causing the heating film 111 to generate heat and thus heat the target heating pack. When the external power supply 200 is required to cooperate with the target discharge pack to heat the target heating pack, the processor 130 controls the output terminal of the first switch 140 connected to the target heating pack to close, so that the target heating pack is connected to the heating power line 101 to await heating. The processor 130 also controls the output terminal of the second switch 150 connected to the target discharge pack to close, so that the target discharge pack transmits energy to the heating power line 101 through the DAB converter 121 connected to the second switch 150.

[0031] It is understood that the external power source 200 refers to a power source that provides electrical energy independently of the energy storage system 100. The external power source 200 can be, but is not limited to, photovoltaic power generation devices (e.g., solar panels and photovoltaic cells / films), wind power generation devices (e.g., micro wind turbines), hydropower generation devices (e.g., micro water turbines), etc.

[0032] The processor 130 is configured to execute the battery pack heating control method provided in the embodiments of this application. More specifically, the processor 130 is used to provide computing and control capabilities to support the energy storage system 100 in executing corresponding business logic and functions, such as supporting the energy storage system 100 in executing the battery pack heating control method provided in the embodiments of this application, or executing the steps in any possible implementation of the battery pack heating control method provided in the embodiments of this application. It is understood that the processor 130 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc., and may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0033] Please see Figure 2B , Figure 2B This illustration shows another structural diagram of an energy storage system provided in some embodiments of this application.

[0034] like Figure 2B As shown, the energy storage system 100 also includes multiple gear adjustment modules 160, which are matched and connected one-to-one with multiple battery packs 110, that is, one gear adjustment module 160 is connected to one battery pack 110. Figure 2B Only one gear shift module 160 is shown, which is connected to a battery pack 110.

[0035] In this embodiment, each gear adjustment module 160 includes multiple (N) gear resistors 161 and multiple (N) third switches 162. For example, the resistance values ​​of each gear resistor 161 are equal; that is, the resistance values ​​of any two gear resistors 161 are equal. It can be understood that if the absolute difference in resistance values ​​of any two gear resistors 161 is less than the resistance error value, the two gear resistors 161 are considered to have equal resistance values. Multiple gear resistors 161 can be connected in parallel; that is, any two or more gear resistors 161 can be configured to be connected in parallel according to actual needs. Here, N is an integer greater than or equal to 2.

[0036] In this configuration, the control terminal of each third switch 162 is connected to the processor 130, and the output terminal of each third switch 162 is used to connect the heating film 111 of a battery pack 110 and a grounded range resistor 161. Specifically, the output terminal of each third switch 162 is connected to the heating film 111 of a battery pack 110 and the first terminal of a range resistor 161, and the second terminal of the range resistor 161 is grounded.

[0037] The processor 130 is also used to control the output terminal of a third switch 162 to close, so that the third switch 162 and the heating film 111 of the battery pack 110 are connected in series. The processor 130 is also used to control the output terminals of multiple third switches 162 to close, so that multiple range resistors 161 are connected in parallel and then in series with the heating film 111 of the battery pack 110.

[0038] For example, refer to Figure 1 The embodiments of this application perform the following battery pack heating control operation: First, based on the current operating temperature and state of charge value of multiple battery packs, candidate battery packs that need to be heated are determined among the multiple battery packs. For example, battery packs whose current operating temperature is lower than the low temperature threshold and whose state of charge value is lower than the charge threshold are candidate battery packs that need to be heated.

[0039] Next, based on the external current of the external power source and the initial heating current of the target heating pack, the battery state of the target heating pack relative to the external power source is determined, wherein the target heating pack is any one of the candidate battery packs.

[0040] Then, if the battery pack is in a discharged state relative to the external power source, the target discharge current of the target discharge pack is determined based on the initial heating current and the external current. The target heating pack is heated in conjunction with the target discharge pack and the external power source based on the target discharge current. The target discharge pack is the battery pack with the largest state of charge value among the multiple battery packs.

[0041] Finally, if the battery pack is in a non-discharge state relative to the external power source, the initial heating current of the target heating pack is upgraded based on the constructed multi-level heating current to determine the final value of the current used for heating, and the external current of the external power source is adjusted to the final value of the current to heat the target heating pack.

[0042] By employing the above methods, when the battery pack is in a discharged state relative to the external power source, the heating requirements of the battery pack can be met, significantly improving the availability and user experience of low-power devices; when the battery pack is in a non-discharge state relative to the external power source, both the heating efficiency and the safety of the battery pack heating are taken into account.

[0043] It should be understood that Figure 1 , Figure 2A and Figure 2B The illustrated embodiments are merely illustrative of one scenario where the energy storage system 100 heats the battery pack, and do not limit the structure, type, or quantity of the energy storage system and external power source in other embodiments. For example, in some other embodiments, the energy storage system may also include... Figure 2A or Figure 2B The structure shown has more or fewer components, or has the same Figure 2A or Figure 2B The diagram shows different configurations of the structure.

[0044] As can be understood from the above, the battery pack heating control method provided in this application embodiment can be implemented by any suitable type of processor with certain computing and control capabilities, such as the processor 130 of the energy storage system 100 described above. In some feasible implementations, the battery pack heating control method provided in this application embodiment can be implemented by the processor executing computer program instructions stored in the memory.

[0045] The following will describe in detail the battery pack heating control method provided in this application embodiment, with reference to exemplary applications and implementations of the energy storage system provided in the embodiments of this application.

[0046] See Figure 3 As shown, the battery pack heating control method provided in this application embodiment includes steps S31 to S34 to achieve heating control of the battery pack.

[0047] Step S31: Based on the current operating temperature and state of charge values ​​of multiple battery packs, determine the candidate battery packs that need to be heated.

[0048] This application embodiment obtains the status information of multiple battery packs through a battery management system. The status information includes at least the current operating temperature and state of charge (SOC) value of the battery packs. Thus, for the first... The battery pack, obtaining the first Current operating temperature of the battery pack and state of charge value , , This refers to the number of battery packs.

[0049] For example, for any battery pack, this embodiment compares the current operating temperature of the battery pack with a temperature threshold and the state of charge (SCC) value of the battery pack with the SCC threshold. Based on the comparison results of the current operating temperature and the temperature threshold, and the comparison results of the SCC value and the SCC threshold, candidate battery packs that need to be heated are determined from among multiple battery packs. The temperature threshold is used to determine whether the battery pack is in a low-temperature state, and the SCC threshold is used to determine whether the battery pack is in a low-charge state and does not require heating to recharge the battery pack after heating.

[0050] In some implementations, the embodiments of this application, through step S311, determine the candidate battery packs that need to be heated among the multiple battery packs based on the current operating temperature and state of charge values ​​of the multiple battery packs.

[0051] Step S311: Determine the battery packs among the multiple battery packs whose current operating temperature is lower than the temperature threshold and whose state of charge value is lower than the state of charge threshold as candidate battery packs.

[0052] In this embodiment, the temperature threshold refers to the lowest temperature at which the battery pack heats up to start, and the state of charge threshold refers to the minimum state of charge value at which the battery pack starts charging. Engineers can customize the temperature threshold and state of charge threshold based on experience data and actual needs, for example, setting the temperature threshold to 0°C and the state of charge threshold to 10%. This embodiment does not impose any limitations on this.

[0053] For example, for each battery pack, this application embodiment compares the current operating temperature of the battery pack with a temperature threshold and the state of charge (SCC) value of the battery pack with the SCC threshold. If the current operating temperature of the battery pack is less than the temperature threshold and the SCC value is less than the SCC threshold, then the battery pack is determined to be a candidate battery pack.

[0054] For example, for the first The battery pack, in this embodiment of the application, will be the first... Current operating temperature of the battery pack With temperature threshold and the first State of charge (SOC) of each battery pack With state of charge threshold When comparing, when the first Current operating temperature of the battery pack Less than the temperature threshold (Right now And the first State of charge (SOC) of each battery pack Less than the state of charge threshold (Right now When ), the first One battery pack was identified as a candidate battery pack.

[0055] In some embodiments, to improve the utilization rate of heating resources, after determining candidate battery packs, for each candidate battery pack, a heating priority index is calculated based on its current operating temperature and state of charge (SOC). For example, the lower the current operating temperature, the higher the heating priority; the lower the SOC, the higher the heating priority. In this embodiment, multiple candidate battery packs are sorted according to the heating priority index to obtain a heating pack queue; candidate battery packs are selected sequentially as target heating packs for subsequent heating control operations according to the order in the heating pack queue. In this way, not only can the battery packs requiring heating be identified, but also, under conditions of limited external power, priority can be given to heating battery packs with more severe low temperatures and lower SOC, thereby improving the low-temperature start-up efficiency of the entire energy storage system.

[0056] Step S32: Determine the battery state of the target heating pack relative to the external power source based on the external current of the external power source and the initial heating current of the target heating pack.

[0057] In this embodiment, the target heating pack is any one of the candidate battery packs. The battery state includes a discharged state and a non-discharge state. The discharged state corresponds to the state when the initial heating current is greater than the external current, and the non-discharge state corresponds to the state when the initial heating current is less than or equal to the external current.

[0058] For example, in this application embodiment, the external current output by the external power supply is obtained, such as by sampling the current output by the external power supply through a current detection module to obtain the external current value of the external power supply.

[0059] Obtain the heating strategy table corresponding to the target heating pack. The heating strategy table is pre-configured with multiple heating levels, and each heating level corresponds to a heating current. For example, the heating strategy table is shown in Table 1 below.

[0060] Table 1:

[0061] In the heating strategy table, the heating current increases sequentially for the first, second, third, fourth, and fifth levels. The first level heating current corresponds to the initial heating current of the lowest heating level. It is understood that Table 1 is only an illustrative representation of the correspondence between heating levels and heating current, and it does not impose any limitations on the division of heating levels or the magnitude of the heating current corresponding to each heating level in other embodiments.

[0062] For example, the initial heating current is compared with the external current of the external power supply. If the initial heating current is greater than the external current, it indicates that the output capacity of the external power supply is lower than the minimum heating requirement of the target heating pack. The external power supply cannot independently heat the target heating pack, and the battery state of the target heating pack relative to the external power supply is determined to be a discharged state. A discharged state means that when the target heating pack performs heating, the external power supply alone cannot meet the heating requirements, and other battery packs in the energy storage system need to be introduced for energy compensation. If the initial heating current is less than or equal to the external current, it indicates that the output capacity of the external power supply meets or exceeds the minimum heating requirement of the target heating pack, and the external power supply can independently heat the target heating pack. The battery state of the target heating pack relative to the external power supply is determined to be a non-discharge state. A non-discharge state means that the external power supply has the ability to independently handle the heating load of the target heating pack without needing to call upon other battery packs in the energy storage system to provide power.

[0063] For example, for the target heating pack If the target heating pack Initial heating current External current greater than external power supply (Right now ), determine the target heating pack The battery is in a discharged state relative to the external power source. If the target heating pack... Initial heating current External current less than or equal to external power supply (Right now ), determine the target heating pack The battery is in a non-discharged state relative to the external power source.

[0064] In some embodiments, a safety margin factor is set. ,in ,For example Calculate the external current of the external power source. With safety margin factor The product of these two factors yields the effective current that can be used for heating. ,Right now: When the target heating pack Initial heating current Greater than the effective current (Right now When determining the target heating pack The battery is in a discharged state relative to the external power source. Meanwhile, when the target heating pack... Initial heating current Less than or equal to the effective current (Right now When determining the target heating pack The battery is in a non-discharged state relative to the external power source.

[0065] In this embodiment, by reserving a certain current margin, the external power supply can be prevented from operating at full load for a long time, thereby improving power supply stability and heating control reliability.

[0066] Step S33: In response to the discharge state, based on the initial heating current and the external current, determine the target discharge current of the target discharge pack, and heat the target heating pack in coordination with the target discharge pack and the external power supply based on the target discharge current.

[0067] The target discharge pack is the battery pack with the largest state of charge value among multiple battery packs.

[0068] For example, when the battery corresponding to the target heating pack is in a discharged state, this embodiment of the application determines the battery pack with the largest state of charge (SOC) value among multiple battery packs as the target discharge pack. That is, the SOC values ​​of multiple battery packs are obtained, sorted in descending order of SOC value, and the battery pack with the largest SOC value is selected as the target discharge pack. In some embodiments, the selected target discharge pack needs to meet the following temperature conditions: the current operating temperature of the target discharge pack is greater than or equal to the low-temperature discharge threshold and less than or equal to the high-temperature discharge threshold. The low-temperature discharge threshold refers to the lowest temperature at which the battery pack is allowed to discharge, and the high-temperature discharge threshold refers to the highest temperature at which the battery pack is allowed to discharge.

[0069] Next, based on the external current of the external power supply and the initial heating current of the target heating pack, the target discharge current is calculated; that is, the target discharge current is the difference between the initial heating current of the target heating pack and the external current of the external power supply. For example, for the target heating pack... Calculate the initial heating current of the target heating pack. External current with external power supply The difference is used to obtain the target discharge current. ,Right now: .

[0070] See Figure 2A As shown, the embodiments of this application control and target discharge package The second switch connected is turned on and controls the target heating pack. The first switch is turned on, thereby connecting the target discharge packet. With target heating pack The energy transfer path between them. Current control commands are sent to the external power supply to control the external power supply to continuously output external current. This allows the external power source to transmit energy to the heating power line, and the energy is then transmitted to the target heating element via the heating power line. The heating film; simultaneously, controlling the target discharge package Continuous output of target discharge current This causes the target discharge packet Energy is transferred to the heating power line, and the energy heating power line transmits the energy to the target heating package. The heating film, thus, the target heating pack The heating film can obtain a total heating current of the initial heating current. To meet the target heating pack The heating requirements were met, enabling the coordinated target discharge package. external power supply to the target heating pack heating.

[0071] In some embodiments, when the heating termination condition is met (such as the current operating temperature of the target heating pack being greater than or equal to a temperature threshold, or a fault alarm occurring), the target discharge pack is controlled to stop outputting the target discharge current and the external power supply is controlled to stop outputting the external current. The first switch connected to the target heating pack and the second switch connected to the target discharge pack are disconnected, thereby disconnecting the energy transmission path between the target discharge pack and the target heating pack.

[0072] In this embodiment, by using the battery pack with the highest state of charge (SOC) value and an external power source to heat the target heating pack in a coordinated manner, the low-temperature battery pack can be heated up quickly, avoiding the situation where the battery pack fails to heat up due to insufficient external power supply. The energy of the battery pack with the highest SOC value is consumed first, which improves the consistency of the SOC values ​​of each battery pack to a certain extent.

[0073] See Figure 4 As shown, in this embodiment of the application, through steps S331 to S332, the target discharge current of the target discharge pack is determined based on the initial heating current and the external current, and the target heating pack is heated in coordination with the target discharge pack and the external power supply based on the target discharge current.

[0074] Step S331: Determine the target discharge current as the difference between the initial heating current and the external current.

[0075] Step S332: The target discharge current and the external current form a parallel branch to heat the heating film of the target heating pack.

[0076] The target discharge current is the difference between the initial heating current and the external current.

[0077] For example, for the target heating pack Calculate the target heating pack Initial heating current With external current The difference is used to obtain the target discharge current. ,Right now: .

[0078] See Figure 2A As shown, in the connected target discharge packet With target heating pack The energy transfer path between them and the external power supply 200 and the target heating pack Following the energy transfer path between them, the embodiments of this application control the target discharge package. Continuous heating pack for the target Provide target discharge current And control the external power supply 200 to continuously output external current. This results in the target discharge current. and external current Form parallel branches to heat the target package. The heating film is heated to achieve the target heating package. The heating film generates heat to heat the target heating pack. heating.

[0079] Step S34: In response to the non-discharge state, based on the constructed multi-stage heating current, the initial heating current of the target heating pack is upgraded to determine the final current value, and the external current is adjusted to the final current value to heat the target heating pack.

[0080] In some implementations, the embodiments of this application, through steps S341 to S344, perform an upgrade operation on the initial heating current of the target heating pack based on the constructed multi-level heating current to determine the final current value.

[0081] Step S341: Construct multiple heating current levels with sequentially increasing current values ​​for the target heating pack.

[0082] In some implementations, the embodiments of this application achieve multiple heating currents with sequentially increasing current values ​​for the target heating pack through steps S3411 to S3413.

[0083] Step S3411: Form a range branch with each range resistor.

[0084] Step S3412: Form a disjoint series relationship between each gear branch and the heating film of the target heating pack.

[0085] Among them, multiple gear branches form a disjoint parallel relationship, which means that multiple gear branches are independent of each other and can be connected in parallel according to actual needs.

[0086] For example, see Figure 2B As shown, for the target heating pack , with the target heating pack The matching gear adjustment module 160 includes multiple (N) gear resistors 161 and multiple (N) third switches 162. Each gear resistor 161 is connected to one third switch 162, and all third switches 162 are also connected to the processor 130 and the target heating pack. The heating film 111 is connected, and all range resistors 161 are grounded.

[0087] See Figure 2B As shown, in this embodiment of the application, each of the N range resistors 161 is formed into a range branch, resulting in N range branches. Then, each of the N range branches is connected to the target heating pack. The heating films form a discontinuous series connection, meaning each gear branch is connected to the target heating pack via a third switch 162. The heating films are connected in series. Each third switch 162 is independent and unrelated to each other, and any one or more of the N third switches 162 can be turned on or off according to actual needs. When multiple third switches 162 are turned on, any two or more gear branches in multiple gear branches can be connected in parallel.

[0088] Step S3413: ... The gear branches are connected in parallel, and the parallel branches are connected in parallel. Each gear branch is connected in series with the heating film of the target heating pack to form the first... A series branch.

[0089] Among them, the The series branch corresponds to the first Heating current setting ,and , All are integers.

[0090] Please see Figure 2B Conductive A third switch 162, thereby... The gear branches (i.e., the gear resistor 161) are connected in parallel to obtain the parallel connection. Each gear branch (gear resistor 161). The parallel connection... Each gear branch (i.e., gear resistor 161) and the target heating pack The heating films 111 are connected in series to form the first A series branch.

[0091] For example, see Figure 2B As shown, Conduct any A third switch 162, thereby... Each gear branch ( The resistors (161) of each range are connected in parallel to obtain the parallel-connected resistors. Each gear branch. The parallel connection will then... Each gear branch ( Each resistance level 161) and the target heating pack The heating films 111 are connected in series to form the first The series branch is obtained, thus obtaining the first series branch. The first heating current corresponding to each series branch.

[0092] when At that time, conduction A third switch 162, thereby enabling any Each gear branch ( The resistors (161) of each range are connected in parallel to obtain the parallel-connected resistors. Each gear has a branch. Each gear branch ( Each resistor (161) is connected in parallel with the target heating element. The heating films 111 are connected in series to form the first The series branch is obtained, thus obtaining the first series branch. The second heating current corresponding to each series branch.

[0093] And so on, when At that time, conduction A third switch 162, thereby enabling any Each gear branch (i.e.) The resistors (161) of each range are connected in parallel to obtain the parallel-connected resistors. Each gear has a branch. Each gear branch (i.e.) After the resistors of each range (161) are connected in parallel, they are then connected to the target heating pack. The heating films 111 are connected in series. This forms the first... The series branch is obtained, thus obtaining the first series branch. The first series branch corresponds to the first Adjust the heating current.

[0094] It is understandable that for multiple resistors with equal resistance values, the more resistors connected in parallel, the smaller the total parallel resistance. This results in a smaller total parallel resistance combined with the total resistance of the heating film in series, leading to a larger current in the heating film's heating circuit. Therefore, the first... The first series branch, the second series branch, ..., the first series branch Each series branch corresponds to the first heating current, the second heating current, ..., the ... Heating current settings. Among the multiple heating current settings, the first... The heating current of the first stage is less than or equal to the current value corresponding to the rated power of the heating film of the target heating pack, and the second stage heating current is less than or equal to the current value corresponding to the rated power of the heating film of the target heating pack. The heating current of each setting is the product of a preset multiple and the first setting heating current. This ensures that the heating current will not exceed the safe range that the heating film can withstand during the heating process, thus protecting the heating film.

[0095] Step S342: Adjust the initial heating current from the first heating current to the second heating current. The operation of increasing the heating current level.

[0096] For example, the heating level corresponding to the initial heating current is used as the starting level, and an upgrade judgment sequence is established according to the heating level from low to high. For example, the upgrade judgment sequence is: first level → second level → third level → fourth level → fifth level.

[0097] For example, starting from the initial heating current setting, it sequentially checks whether the heating current corresponding to the next setting meets the upgrade condition. The upgrade condition is: , This indicates the heating current corresponding to the next setting. This refers to the external current from an external power source.

[0098] If the conditions for upgrading are met, the upgrade operation is executed to determine the final value of the current used for heating. If the conditions for upgrading are not met, the upgrade operation is stopped.

[0099] For example, for the target heating pack External current of external power supply Starting from the initial heating current (the heating current corresponding to the first setting), the heating current corresponding to the next setting (i.e., the heating current corresponding to the second setting) is adjusted. ) and external current By comparison, we can see If so, then the upshift operation will be executed. Continue to increase the heating current corresponding to the next gear (i.e., the heating current corresponding to the third gear). ) and external current By comparison, we can see Continue the upshift operation. Continue increasing the heating current corresponding to the next gear (i.e., the heating current corresponding to the fourth gear). ) and external current By comparison, we can see The process of upgrading is stopped. Finally, the heating current corresponding to the highest gear that meets the upgrade conditions is determined as the final current value; that is, the heating current corresponding to the third gear is determined (i.e.,...). ) represents the final value of the current used for heating.

[0100] For example, after determining the final current value used for heating, this embodiment of the application adjusts the external current to the final current value to heat the target heating pack. Specifically, a current adjustment command is generated based on the determined final current value and sent to an external power supply. This command controls the external power supply to gradually adjust the output current to the final current value and continuously outputs the final current value to the heating film of the target heating pack, thereby generating heat to heat the target heating pack. The current adjustment command carries the final current value, the current adjustment rate (e.g., 1 A / s), and an identifier for the target heating pack. The external current output by the external power supply is gradually reduced from 13A to 12A to avoid sudden current surges that could cause busbar impact, switch contact wear, or rapid changes in battery pack temperature.

[0101] In this embodiment, only the energy provided by the external power source is needed to heat the target heating pack. No other battery packs in the energy storage system need to participate in the discharge. Instead of directly using the initial heating current, the heating power (heating current) is further increased. In this way, the energy provided by the external power source is fully utilized, thereby shortening the battery pack heating time, improving the battery pack heating efficiency, and improving the energy utilization rate of the external power source.

[0102] In some embodiments, when any of the following conditions are met: the current operating temperature of the target heating pack is greater than or equal to the temperature threshold, the target heating pack experiences an over-temperature fault, or a communication fault occurs, the external power supply is controlled to stop outputting current, and the heating of the target heating pack is terminated.

[0103] Step S343: After each upshift operation, if the current heating current of the target heating pack is greater than the external current, perform a downshift operation to determine the final current value.

[0104] For example, starting from the initial heating current, the heating current is increased from the first level to the next level. The heating current is increased in stages, that is, the heating current is gradually increased from the first stage to the next stage. Heating current levels: first heating current (initial heating current) → second heating current → ... → the next heating current level. Adjust the heating current.

[0105] After each heating current upgrade operation, the current heating current of the target heating pack is compared with the external current of the external power supply. If the current heating current of the target heating pack is greater than the external current, a current downgrade operation is performed to determine the final current value used for heating. That is, the current heating current is downgraded to the previous heating current, and the previous heating current is determined as the final current value.

[0106] In some embodiments, the present application implements step S3431 to determine the final current value by performing a current downgrading operation if the current heating current of the target heating pack is greater than the external current. Specifically, the heating current of the previous heating current is determined as the final current value.

[0107] For example, after each heating current upgrade operation, if the current heating current of the target heating pack is greater than the external current, the previous heating current is determined as the final current value.

[0108] For example, for the target heating pack External current of external power supply After performing the current upgrade operation from the second heating current of 10A to the third heating current of 12A, the current heating current of the target heating pack is the third heating current of 12A. It can be seen that the third heating current of 12A is greater than the external current of the external power supply of 11A. The current heating current is then reduced to the previous heating current, that is, from the third heating current of 12A to the previous heating current (i.e., the second heating current of 10A), and the previous heating current (i.e., the second heating current of 10A) is determined as the final current value.

[0109] Step S344: If a current downshift operation is not performed during the current upshift operation, then determine the first... The heating current is the final value of the current.

[0110] For example, if no current downgrade operation is performed during the current upgrade operation, that is, the heating current is gradually increased from the first level to the second level... During the process of adjusting the heating current, the current reduction operation (which would normally involve downgrading from the current heating current to the previous setting) is never executed, indicating that the maximum current setting has been reached (i.e., the [number]th setting). (Heating current), determine the first The heating current is the final value of the current.

[0111] In this case, the external power supply operates at its maximum current setting (i.e., the first...). The heating current is used to heat the target heating pack, thereby improving heating efficiency, shortening heating time, and increasing the energy utilization rate of the external power source.

[0112] In one or more embodiments, the battery pack heating control method provided in this application further includes step S41.

[0113] Step S41: Select the candidate battery packs as target heating packs in ascending order of their coded address numbers.

[0114] For example, after screening candidate battery packs, a candidate battery pack set is constructed. Each candidate battery pack in the set is associated with a corresponding coded address number, which is used to uniquely identify the battery pack in the energy storage system. It is easy to understand that the coded address number can be a factory-configured address, a logical address assigned by the battery management system, etc.

[0115] For example, in some embodiments, the candidate battery pack set is shown in Table 2 below.

[0116] Table 2:

[0117] According to Table 2, the candidate battery packs include battery pack A1, battery pack A2, battery pack A3, battery pack A4, and battery pack A5. The coded address numbers of battery packs A1, A2, A3, A4, and A5 are 01, 03, 05, 06, and 08, respectively. It is understood that Table 2 is only an illustrative representation of the correspondence between candidate battery packs and their coded address numbers, and it does not impose any specific limitations on the number of candidate battery packs or the coded address number corresponding to each candidate battery pack in other embodiments.

[0118] For example, in this embodiment of the application, the coded address numbers of all candidate battery packs are obtained, and the candidate battery packs are sorted in ascending order of coded address numbers to obtain a candidate heating queue. Candidate battery packs are selected sequentially from the front to the back of the candidate heating queue as target heating packs. That is, when performing the heating operation for the first time, the first candidate battery pack in the candidate heating queue is selected as the target heating pack, and the candidate battery pack with the smallest coded address number (e.g., battery pack A1 in Table 2) is determined as the target heating pack; when performing the heating operation for the second time, the second candidate battery pack in the candidate heating queue is selected as the target heating pack, and the candidate battery pack with the second smallest coded address number (e.g., battery pack A2 in Table 2) is determined as the target heating pack; and so on, until the second heating operation is performed. When performing the heating operation for the second time, the candidate heating queue is selected. A number of candidate battery packs were selected as the target heating packs, with the candidate battery pack having the largest coded address sequence number (e.g., battery pack A5 in Table 2) being identified as the target heating pack. This represents the number of candidate battery packs.

[0119] Overall, the embodiments of this application have at least the following beneficial effects.

[0120] 1) Ensure heating start-up and high efficiency under extreme conditions: Completely eliminate the "stalemate" of heating failure due to insufficient power from external power source. By calling on the existing battery energy in the energy storage system (i.e., the energy of the target discharge pack), the target discharge pack acts as a heating power source with low dependence on external power source and internal circulation, ensuring that the battery pack can quickly start the heating process in low-temperature environments and efficiently increase the cell temperature.

[0121] 2) Extremely high energy utilization rate within the system: The embodiments of this application realize the precise reuse and on-demand allocation of energy within the energy storage system. Energy flows directly from the target discharge pack to the equalizer, and then from the equalizer to the target heating pack. The energy transmission path is the shortest, the energy loss is minimal, and the precise delivery of energy is achieved, thereby improving the energy utilization rate.

[0122] 3) Meeting the need for rapid entry into charging state: By enabling internal energy-assisted heating, the energy storage system does not need to passively wait for the power of the external power source to increase. It can actively and synchronously heat the low-temperature battery pack, significantly shortening the overall preheating time of the energy storage system from a low-temperature state to a rechargeable state. Once the battery pack temperature is greater than or equal to the temperature threshold, the energy storage system can immediately (or seamlessly when the power of the external power source is restored) switch to the charging state, improving the charging response speed and equipment availability of the energy storage system in unstable power supply scenarios such as photovoltaic and wind power generation.

[0123] 4) Significantly enhances system reliability and adaptability: The embodiments of this application significantly improve the working reliability of the energy storage system in pure off-grid, weak current or other unstable power supply environments, expand the application scenarios of the energy storage system and enhance its market competitiveness.

[0124] This application provides a computer-readable storage medium storing processor-executable computer program instructions. When executed by the processor, the computer program instructions cause the processor to perform the battery pack heating control method provided in this application.

[0125] In some embodiments, the storage medium may be a flash memory, a hard disk, an optical disk, a register, a magnetic surface memory, a removable disk, a CD-ROM, a random access memory (RAM), a read-only memory (ROM), an electrically programmable ROM, and an electrically erasable programmable ROM, or any other form of storage medium known in the art, or various devices including one or any combination of the above storage media.

[0126] In some embodiments, computer program instructions may take the form of programs, software, software modules, scripts, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as stand-alone programs or as modules, components, subroutines, or other units suitable for use in a computing environment.

[0127] As an example, computer program instructions may, but do not necessarily, correspond to files in a file system, and may be stored as part of a file that holds other programs or data, for example, in one or more scripts in an HTML (Hypertext Markup Language) document, or in a single file dedicated to the program in question, or in multiple collaborative files (e.g., a file that stores one or more modules, subroutines, or code sections).

[0128] As an example, computer program instructions can be deployed to execute on a single computing device (including devices such as smart terminals and servers), or on multiple computing devices located in one location, or on multiple computing devices distributed across multiple locations and interconnected via a communication network. It is readily understood that all or part of the steps of the methods described in the embodiments provided above can be implemented directly using electronic hardware or processor-executable computer program instructions, or a combination of both.

[0129] Those skilled in the art will understand that the embodiments provided in this application are merely illustrative. The order in which the steps in the methods of the embodiments are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The order can be adjusted, merged, and deleted according to actual needs. Modules or sub-modules, units or sub-units in the apparatus or system of the embodiments can be merged, divided, and deleted according to actual needs. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0130] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, and of course, it can also be implemented using hardware. Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This computer program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. It should be understood that the storage medium can be flash memory, hard disk, optical disk, register, magnetic surface memory, removable disk, CD-ROM, random access memory (RAM), read-only memory (ROM), electrically programmable ROM, and electrically erasable programmable ROM, etc.

[0131] It should be noted that the above embodiments are for illustrating the technical concept and features of this application, and are intended to enable those skilled in the art to understand the content of this application and implement it accordingly. They should not be construed as limiting the scope of protection of this application. Those skilled in the art can understand that all or part of the processes of the above embodiments can be implemented, modified according to the technical solutions described in the embodiments of this application, or equivalent substitutions can be made to some of the technical features. It is understood that these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and should be considered as equivalent changes and modifications made based on the embodiments of this application, all of which should fall within the scope of the claims of this application.

Claims

1. A battery pack heating control method, characterized in that, include: Based on the current operating temperature and state of charge (SOC) values ​​of the multiple battery packs, candidate battery packs that need to be heated are identified. Among these, the battery packs whose current operating temperature is less than a temperature threshold and whose SOC values ​​are less than the SOC threshold are the candidate battery packs. Based on the external current of the external power supply and the initial heating current of the target heating pack, the battery state of the target heating pack relative to the external power supply is determined. The target heating pack is any one of the candidate battery packs. The battery state includes a discharge state and a non-discharge state. The discharge state is the state corresponding to when the initial heating current is greater than the external current, and the non-discharge state is the state corresponding to when the initial heating current is less than or equal to the external current. In response to the discharge state, based on the initial heating current and the external current, a target discharge current of the target discharge pack is determined, and the target heating pack is heated in conjunction with the target discharge pack and the external power supply based on the target discharge current. The target discharge pack is the battery pack with the largest state of charge value among the multiple battery packs. In response to the non-discharge state, based on the constructed multi-level heating current, the initial heating current of the target heating pack is increased to determine the final current value, and the external current is adjusted to the final current value to heat the target heating pack; wherein, the first level of the multi-level heating current is the initial heating current, and the second level of the multi-level heating current is the initial heating current. The heating current of the first heating element is less than or equal to the current value corresponding to the rated power of the heating film of the target heating pack, and the first heating element... The heating current of each setting is the product of a preset multiple and the heating current of the first setting.

2. The battery pack heating control method according to claim 1, characterized in that, The step of determining the target discharge current of the target discharge pack based on the initial heating current and the external current, and heating the target heating pack in coordination with the target discharge pack and the external power supply based on the target discharge current, includes: The target discharge current is determined to be the difference between the initial heating current and the external current; The target discharge current and the external current form a parallel branch to heat the heating film of the target heating pack.

3. The battery pack heating control method according to claim 1, characterized in that, The step of increasing the initial heating current of the target heating pack based on the constructed multi-level heating current to determine the final current value includes: To construct multiple heating current levels with sequentially increasing current values ​​for the target heating pack; The initial heating current is adjusted from the first heating current to the second heating current. The current level adjustment operation for the heating current setting; After each upgrade operation, if the current heating current of the target heating pack is greater than the external current, a current downgrade operation is performed to determine the final current value. If the current downshift operation is not performed during the current upshift operation, then the first... The heating current is the final value of the current.

4. The battery pack heating control method according to claim 3, characterized in that, The step of performing a current downgrading operation to determine the final current value if the current setting of the target heating pack is greater than the external current includes: The heating current preceding the current setting is determined as the final current value.

5. The battery pack heating control method according to claim 3, characterized in that, The method of constructing multiple heating current levels with sequentially increasing current values ​​for the target heating pack includes: Each range resistor forms a range branch, and multiple range branches form a disjoint parallel connection. Each of the aforementioned gear positions and the heating film of the target heating pack are connected in a disjoint series relationship; Will The aforementioned gear branches are connected in parallel, and the parallel branches are connected in parallel. Each of the aforementioned gear branches is connected in series with the heating film of the target heating pack to form the first... The series branch, the first The series branch corresponds to the first The heating current is set, among which, .

6. The battery pack heating control method according to claim 1, characterized in that, The battery pack heating control method further includes: Based on the coded address sequence number of the candidate battery pack, the candidate battery packs are selected as the target heating packs in ascending order of coded address sequence number.

7. An energy storage system, characterized in that, include: Multiple battery packs, each of which is provided with a heating film; An equalizer and a processor, the equalizer including a plurality of DAB converters all connected to the processor, each of the DAB converters also being connected to a heating power line; Multiple first switches, the control terminal of each first switch is connected to the processor, and the output terminal of each first switch is used to connect to a battery pack and a heating power line; Multiple second switches, the control terminal of each second switch is connected to the processor, and the output terminal of each second switch is used to connect to a DAB converter and a battery pack; The processor is configured to execute the battery pack heating control method as described in any one of claims 1 to 6, and the processor is further configured to control the output terminal of a first switch to close, so that a target heating pack connected to the first switch is connected to the heating power line to wait for heating; the processor is further configured to control the output terminal of a second switch to close, so that a target discharge pack connected to the second switch transmits energy to the heating power line through the DAB converter connected to the second switch.

8. The energy storage system according to claim 7, characterized in that, The energy storage system further includes multiple gear adjustment modules that are matched and connected to each of the multiple battery packs. Each gear adjustment module is connected to one of the battery packs, and each gear adjustment module includes: Multiple range resistors that can be connected in parallel, each range resistor having the same resistance value; Multiple third switches, the control terminal of each third switch is connected to the processor, and the output terminal of each third switch is used to connect a heating film of the battery pack and a grounded range resistor; The processor is also configured to control the output terminal of one of the third switches to close, so that the third switch and the heating film of the battery pack are connected in series; the processor is also configured to control the output terminals of multiple third switches to close, so that multiple range resistors are connected in parallel and then in series with the heating film.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when executed by a processor, cause the processor to perform the battery pack heating control method as described in any one of claims 1 to 6.

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