Charging and discharging control method, extensible outdoor power supply and power supply system

Abstract

The invention relates to the field of battery management systems, and discloses a charging and discharging control method, an extensible outdoor power supply and a power supply system, the method is applied to the extensible outdoor power supply, and the extensible outdoor power supply is provided with a main battery pack and an extensible battery pack which are connected in parallel. Comprising the following steps: determining a real-time charging current and a real-time discharging current of the extensible outdoor power supply; and according to a current magnitude comparison result of the real-time charging current and the real-time discharging current, a charging and discharging control strategy of the extensible outdoor power supply is determined. Wherein the charging and discharging control strategy is used for controlling the charging priority of the main battery pack to be higher than the charging priority of the extended battery pack; or the charge and discharge control strategy is used for controlling the discharge priority of the extended battery pack to be higher than the discharge priority of the main battery pack. Therefore, the charging and discharging control method which can carry the expansion battery packs as few as possible and even can perform power supply task scheduling management without the expansion battery packs under the condition of meeting the use requirement is realized.

Description

Technical Field

[0001] This application relates to the field of battery management systems, and more particularly to a charge / discharge control method, an expandable outdoor power supply, and a power system. Background Technology

[0002] A portable AC / DC power supply is a type of power source with a built-in lithium-ion battery that stores electrical energy to power various outdoor devices. Most portable power supplies are designed as a single unit, but some models allow users to expand their power reserves by adding additional expansion battery packs. However, these expansion battery packs are often bulky and difficult to carry. Therefore, how to more effectively control the charging and discharging of the portable power supply and its expansion battery packs becomes a problem that needs to be solved. Summary of the Invention

[0003] This application aims to at least partially address one of the technical problems in related technologies. To this end, this application proposes a charging and discharging control method, a scalable outdoor power supply, and a power system. The main technical solutions adopted in this application include:

[0004] In a first aspect, embodiments of this application provide a charge / discharge control method applied to a scalable outdoor power supply, the scalable outdoor power supply having a main battery pack and an extended battery pack connected in parallel; the method includes: determining the real-time charging current and real-time discharging current of the scalable outdoor power supply; determining a charge / discharge control strategy for the scalable outdoor power supply based on a comparison of the magnitudes of the real-time charging current and the real-time discharging current; wherein the charge / discharge control strategy is used to control the charging priority of the main battery pack to be higher than the charging priority of the extended battery pack; or, the charge / discharge control strategy is used to control the discharging priority of the extended battery pack to be higher than the discharging priority of the main battery pack.

[0005] Optionally, determining the real-time charging current and real-time discharging current of the expandable outdoor power supply includes: determining the real-time charging current and real-time discharging current of the expandable outdoor power supply when it is detected that the expandable outdoor power supply is in a state of simultaneous charging and discharging.

[0006] Optionally, based on the comparison of the real-time charging current and the real-time discharging current, a charging and discharging control strategy for the expandable outdoor power supply is determined, including: when the real-time charging current is greater than the real-time discharging current, according to the first charging and discharging control strategy, the main battery pack is prioritized for charging, and the extended battery pack is controlled for discharging; if the subsequent charging current is detected to be less than or equal to the subsequent discharging current, the first charging and discharging control strategy is switched to the second charging and discharging control strategy, and the extended battery pack is controlled for priority discharging according to the second charging and discharging control strategy; or when the real-time charging current is less than or equal to the real-time discharging current, the extended battery pack is controlled for priority discharging according to the second charging and discharging control strategy; if the subsequent charging current is detected to be greater than the subsequent discharging current, the second charging and discharging control strategy is switched to the first charging and discharging control strategy, and the main battery pack is prioritized for charging, and the extended battery pack is controlled for discharging according to the first charging and discharging control strategy.

[0007] Optionally, the method further includes: if it is detected that the subsequent charging current is still greater than the subsequent discharging current, continue to control the main battery pack to be charged preferentially and the extended battery pack to be discharged according to the first charge-discharge control strategy; or if it is detected that the subsequent charging current is still less than or equal to the subsequent discharging current, continue to control the extended battery pack to be discharged preferentially according to the second charge-discharge control strategy.

[0008] Optionally, there are multiple extended battery packs; based on the comparison of the real-time charging current and the real-time discharging current, a charging and discharging control strategy for the expandable outdoor power supply is determined, including: when the real-time charging current is greater than the real-time discharging current, determining the respective charge status of the main battery pack and the multiple extended battery packs; if the charge status of the main battery pack determines that the main battery pack is not fully charged, according to the first charging and discharging control strategy, the main battery pack is charged first, and then the multiple extended battery packs are charged according to their respective charge statuses.

[0009] Optionally, charging the multiple extended battery packs according to their respective state of charge includes: after fully charging the main battery pack, selecting the first battery pack with the highest state of charge below a first power threshold and charging it; after the state of charge of the first battery pack reaches the first power threshold, repeating the selection and charging process until all extended battery packs with state of charge below the first power threshold reach the first power threshold; if a second battery pack with state of charge above the first power threshold but not fully charged is detected, continuing to charge the extended battery packs with state of charge reaching the first power threshold; if the state of charge of all extended battery packs reaches the second power threshold, charging the multiple extended battery packs according to a preset charging sequence until all extended battery packs are fully charged; wherein the second power threshold is determined based on the state of charge of the second battery pack.

[0010] Optionally, there are multiple extended battery packs; based on the comparison of the real-time charging current and the real-time discharging current, a charging and discharging control strategy for the expandable outdoor power supply is determined, including: when the real-time charging current is less than or equal to the real-time discharging current, determining the respective state of charge of each of the multiple extended battery packs; controlling the multiple extended battery packs to discharge first according to their respective state of charge, according to the second charging and discharging control strategy; and controlling the main battery pack to discharge again when the state of charge of each of the multiple extended battery packs is empty.

[0011] Optionally, the discharge of multiple extended battery packs is controlled based on their respective state of charge, including: selecting the third battery pack with the highest charge level above a third charge threshold and controlling it to discharge first; if the charge level of the third battery pack reaches the third charge threshold; repeating the selection and discharge process until all extended battery packs with charge levels above the third charge threshold reach the third charge threshold; if a fourth battery pack with charge levels below the third charge threshold and not completely depleted is detected, controlling the extended battery packs with charge levels reaching the third charge threshold to continue discharging; and when all extended battery packs have reached the fourth charge threshold, controlling them to discharge according to a preset discharge sequence until each of the extended battery packs is completely depleted; wherein the fourth charge threshold is determined based on the charge level of the fourth battery pack.

[0012] Secondly, embodiments of this application provide a scalable outdoor power supply, which includes a main battery pack and an extended battery pack connected in parallel. The parallel management system of the scalable outdoor power supply is used to perform the steps of any of the methods described above.

[0013] Thirdly, this application also provides a power system including the aforementioned expandable outdoor power supply for performing the steps of any of the methods described above.

[0014] In the above embodiments, the real-time charging current and real-time discharging current of the expandable outdoor power supply are determined; and based on the comparison of the magnitudes of the real-time charging current and real-time discharging current, a charging and discharging control strategy for the expandable outdoor power supply is determined. The charging and discharging control strategy is used to control the charging priority of the main battery pack to be higher than the charging priority of the extended battery pack; or, the charging and discharging control strategy is used to control the discharging priority of the extended battery pack to be higher than the discharging priority of the main battery pack. Thus, a charging and discharging control method is achieved that, under suitable usage conditions, can perform power supply task scheduling and management with as few extended battery packs as possible, or even without extended battery packs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1a This is a flowchart of a charging and discharging control method according to an embodiment of this application;

[0017] Figure 1b This is a structural block diagram of a scalable outdoor power supply according to an embodiment of this application;

[0018] Figure 2 A flowchart of a charge / discharge control strategy provided according to an embodiment of this application;

[0019] Figure 3a A flowchart of a charge / discharge control strategy provided according to another embodiment of this application;

[0020] Figure 3b This is a schematic diagram of the power status according to one embodiment of this application;

[0021] Figure 4 A flowchart of a charge / discharge control strategy provided according to yet another embodiment of this application;

[0022] Figure 5 This is a flowchart of a charge / discharge control strategy provided according to another embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. 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.

[0024] A portable AC / DC power supply is a type of power source with a built-in lithium-ion battery that stores electrical energy to power various outdoor devices. Most portable power supplies are designed as a single unit, but some models allow users to expand their power reserves by adding additional battery packs. However, these additional battery packs are often bulky and difficult to carry. Therefore, how to more effectively manage and charge portable power supplies and their extended battery packs has become a problem that needs to be solved. In related technologies, the charging and discharging scheduling management of portable power supplies and their extended battery packs focuses on simultaneous charging or discharging, and because high-power portable power supplies and extended battery packs are generally heavy and inconvenient to carry, their applicability to outdoor scenarios is limited.

[0025] For example, in disaster relief or engineering applications, if 10 usable extended battery packs are fully charged at the main camp, and power needs to be provided to several different locations near the main camp, the following problems may arise under the simultaneous charging and discharging scheduling management: If only the main unit and 3 of the extended battery packs are carried, after working at point A for one or two hours, due to the simultaneous charging and discharging management method, the main battery pack and the three extended battery packs may have discharged to 60% of their remaining power. Then, proceeding to point B to provide power, after working at point B for one or two hours, the main battery pack and the three extended battery packs may have discharged to 20%. Since the needs and power consumption at different work locations are difficult to predict, if power needs to be provided at point C, the main battery pack may run out of power while the power supply mission is underway at point C, causing the mission to abruptly end, and requiring a return to the main camp for recharging. Furthermore, during this process, due to the simultaneous charging and discharging, the main unit and the three extended battery packs need to move together continuously, which not only increases the logistical burden but may also lead to delays when rapid response is required.

[0026] Therefore, this simultaneous charging and discharging management method is not ideal because it cannot adapt to the changing outdoor working environment, lacks flexibility, and may lead to mission failure in actual operation. We need a smarter and more efficient charging and discharging scheduling management method to ensure continuous and reliable power support during outdoor operations.

[0027] According to embodiments of this application, a charging and discharging control method, an scalable outdoor power supply, and a power system are provided. It should be noted that the steps shown in the flowcharts in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowcharts, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0028] This embodiment provides a charging and discharging control method applied to a scalable outdoor power supply, which has a main battery pack and an extended battery pack connected in parallel. Figure 1a This is a flowchart of a charging and discharging control method according to an embodiment of this application, such as... Figure 1a As shown, the process includes the following steps:

[0029] S110. Determine the real-time charging current and real-time discharging current of the scalable outdoor power supply.

[0030] Among them, a scalable outdoor power supply can be a power device that allows users to add additional battery packs as needed to increase the total power capacity and extend the usage time.

[0031] For example, a scalable outdoor power supply can consist of a main unit and several expansion battery packs, please refer to... Figure 1b The outdoor power supply unit includes a charging interface for charging, a discharging interface for discharging, and a main battery pack 101 for independently operating and supplying power. The charging interface can receive AC input, photovoltaic input, adapter input, cigarette lighter input, or other DC input, while the discharging interface can receive AC output, USB output, cigarette lighter output, or other DC output. The main battery pack 101 also has expansion ports, allowing multiple expansion battery packs 103 to be connected in parallel to increase capacity. The expansion battery packs also have expansion ports for daisy-chaining with the main unit via parallel cables. Optionally, the end expansion ports can also connect to the aforementioned discharging or charging devices, functioning equivalently to the charging and discharging interfaces of the main unit. For example, please refer to... Figure 1b The extended battery pack features a multi-functional expansion port, allowing users to directly connect laptops, mobile phones, or other power-consuming devices to the pack and utilize its stored power. This enables users to conveniently charge or power their devices without relying on the host's charging port. Furthermore, when the host's charging port is occupied or multiple battery packs need to be charged simultaneously, an external charger can be connected via the expansion port on the extended battery pack. Even without direct connection to the host, the extended battery pack can be effectively charged, ensuring continuous operation of the power system and timely replenishment of power.

[0032] Real-time charging current can be understood as the input current received by the outdoor power supply from the external power source at any given moment. It is understood that the magnitude of the real-time charging current changes in real time with variations in charging conditions (such as power supply voltage, charging circuit resistance, etc.) and the battery states of the main battery pack and various extension battery packs of the outdoor power supply (such as remaining battery capacity, battery charging efficiency, etc.).

[0033] Similarly, real-time discharge current can refer to the current output by the outdoor power supply at a certain moment. Real-time discharge current is also dynamic, varying according to the load conditions of the main battery pack and each extension battery pack (i.e., the power requirements of the devices connected to the power source) and the state of each battery (such as the remaining charge and discharge efficiency).

[0034] Specifically, both the main battery pack and the extended battery pack can be equipped with a BMS system, which integrates the monitoring functions of parameters such as battery voltage, current and temperature. Through the BMS system, the real-time charging current and real-time discharging current of the main battery pack and each extended battery pack can be monitored in real time.

[0035] For example, in an outdoor environment during the afternoon, a photovoltaic panel charges the main unit via the charging interface and discharges to a terminal device via the discharging interface. Initially, with ample sunlight, the real-time charging current of the entire expandable outdoor power supply is the input current generated by the strong sunlight received by the photovoltaic panel, while the real-time discharging current is the output current supplying power to the terminal device. As time passes and darkness falls, the photovoltaic panel receives less sunlight, causing the input current to decrease or even disappear. At this point, the real-time charging current of the entire expandable outdoor power supply can be a small current or even zero. If power is then needed for another terminal device, the real-time discharging current of the entire expandable outdoor power supply becomes the total output current supplying power to both terminal devices.

[0036] S120. Based on the comparison results of the real-time charging current and the real-time discharging current, determine the charging and discharging control strategy of the expandable outdoor power supply.

[0037] In this context, the charge / discharge control strategy refers to a series of rules and algorithms used in a power management system to determine the charging and discharging sequence, timing, and rate of each battery pack. Specifically, in a scalable outdoor power supply, the charge / discharge control strategy is used to control the charging priority of the main battery pack to be higher than that of the extended battery pack; or, the charge / discharge control strategy is used to control the discharging priority of the extended battery pack to be higher than that of the main battery pack.

[0038] Specifically, after the BMS system based on the main battery pack and the extended battery pack of the host obtains the real-time charging current and the real-time discharging current, it can determine the working mode of the expandable outdoor power supply by comparing the magnitude of the real-time charging current and the real-time discharging current, that is, execute different charging and discharging control strategies, and then adjust the charging and discharging priority of the main battery pack and the extended battery pack.

[0039] For example, let's consider an outdoor environment in the afternoon. A photovoltaic panel charges the main unit via its charging interface and discharges to a terminal device via its discharging interface. At the start of operation, with ample sunlight, the real-time charging current of the entire expandable outdoor power supply is the larger input current generated by the photovoltaic panel, while the real-time discharging current is only the output current supplying power to the terminal device. If the real-time charging current of the entire expandable outdoor power supply is greater than the real-time discharging current, the charging priority of the main battery pack and the extended battery pack can be adjusted accordingly based on the charging and discharging control strategy. If the charging priority of the main battery pack is adjusted to be higher than that of the extended battery pack, then the charging current input from the photovoltaic panel can be entirely used to charge the main battery pack of the main unit until it is fully charged, and then the extended battery pack will be charged.

[0040] Similarly, as time passes and darkness falls, the photovoltaic panels receive insufficient sunlight. At this point, the real-time charging current of the entire expandable outdoor power supply will decrease, potentially falling below the output current used to power the terminal devices. In other words, the real-time charging current of the entire expandable outdoor power supply may be less than or equal to the real-time discharging current. In this situation, the discharge priority of the main battery pack and the expansion battery packs in the expandable outdoor power supply will be adjusted accordingly based on the charge / discharge control strategy. If the discharge priority of the expansion battery pack is adjusted to be higher than that of the main battery pack, then only the expansion battery packs will be used to power the terminal devices until all the expansion battery packs are depleted, at which point the main battery pack will then be used to power the terminal devices.

[0041] Understandably, since extended battery packs are often bulky and difficult to carry, by comparing the magnitudes of real-time charging and discharging currents and determining different charging and discharging priorities for the main battery pack and extended battery packs of the expandable outdoor power supply based on the charging and discharging control strategy, it is possible to carry as few extended battery packs as possible, or even carry only the main unit without the extended battery packs to perform power supply tasks.

[0042] For example, in disaster relief or engineering applications, if there are several fully charged and usable expansion packs at the main camp, and it is necessary to provide power to different locations near the main camp, due to the different work locations and the variable power requirements, only the main unit and some of the expansion packs can be carried. If only the main unit and three of the expansion packs are carried, and a power supply task is required upon arrival at point A, the BMS system of the main unit's main battery pack and the expansion packs obtains the real-time charging and discharging currents. Based on the charging and discharging control strategy, the discharging priority of the expansion packs is controlled to be higher than that of the main battery pack. Therefore, the power supply task at point A may be completed by depleting the power of one of the expansion packs. At this time, only the remaining two expansion packs can be carried to the next location B for the power supply task. If the remaining two expansion packs are discharged to empty after working at point B for one or two hours, since the main unit is still fully charged, only the main unit can be carried directly to point C for the power supply task.

[0043] Furthermore, if the main battery pack of the host computer is insufficient to power point C, it can return to the main camp for recharging after its main battery pack is depleted. Similarly, after the BMS system based on the main battery pack and the extended battery pack obtains the real-time charging and discharging currents, it controls the charging priority of the main battery pack to be higher than that of the extended battery pack based on the charging and discharging control strategy. In this way, the main battery pack of the host computer can quickly return to a fully charged state, and at this time it can directly carry the other fully charged and usable extended battery packs in the main camp to continue the power supply task.

[0044] In the above embodiments, the real-time charging current and real-time discharging current of the expandable outdoor power supply are determined; and based on the comparison of the magnitudes of the real-time charging current and real-time discharging current, a charging and discharging control strategy for the expandable outdoor power supply is determined. The charging and discharging control strategy is used to control the charging priority of the main battery pack to be higher than the charging priority of the extended battery pack; or, the charging and discharging control strategy is used to control the discharging priority of the extended battery pack to be higher than the discharging priority of the main battery pack. Thus, a charging and discharging control method is achieved that, under suitable usage conditions, can perform power supply task scheduling and management with as few extended battery packs as possible, or even without extended battery packs.

[0045] In some implementations, determining the real-time charging current and real-time discharging current of the scalable outdoor power supply includes:

[0046] When the expandable outdoor power supply is detected to be in a state of simultaneous charging and discharging, determine the real-time charging current and real-time discharging current of the expandable outdoor power supply.

[0047] It is important to understand that the working state of the expandable outdoor power supply is not limited to a single application scenario of charging or discharging. If it is detected that the power supply is discharging to external devices while receiving external power, that is, if it is detected that the expandable outdoor power supply is in a state of simultaneous charging and discharging, then the real-time charging current and real-time discharging current of the expandable outdoor power supply can be further determined.

[0048] Specifically, both the main battery pack and the extended battery pack of the expandable outdoor power unit can be equipped with a BMS system, which integrates monitoring functions for parameters such as battery voltage, current and temperature. Through the BMS system, the real-time charging current and real-time discharging current of the main battery pack and each extended battery pack can be monitored in real time.

[0049] In the above embodiments, by determining the real-time charging current and real-time discharging current of the expandable outdoor power supply in the state of simultaneous charging and discharging, accurate data support is provided for determining the charging and discharging control strategy of the expandable outdoor power supply. This allows the expandable outdoor power supply to flexibly switch between different working modes based on different charging and discharging control strategies, thereby optimizing power distribution.

[0050] In some implementations, a charging and discharging control strategy for the scalable outdoor power supply is determined based on a comparison of the magnitudes of the real-time charging current and the real-time discharging current, including:

[0051] When the real-time charging current is greater than the real-time discharging current, the main battery pack is prioritized for charging and the extended battery pack is controlled to discharge according to the first charge and discharge control strategy.

[0052] The first charge / discharge control strategy can be a rule and algorithm used to determine the charge / discharge priority of the main battery pack and the extended battery pack. Specifically, the first charge / discharge control strategy can be used to control the charging priority of the main battery pack to be higher than that of the extended battery pack. That is, when the extended outdoor power supply is in a state of simultaneous charging and discharging, if the real-time charging current is detected to be greater than the real-time discharging current, the first charge / discharge control strategy can be used to control the main battery pack to be charged first, while the extended battery pack is controlled to be discharged first, until the main battery pack is fully charged, and then the extended battery pack is charged.

[0053] Furthermore, if the subsequent charging current is detected to be less than or equal to the subsequent discharging current, the first charging and discharging control strategy is switched to the second charging and discharging control strategy, and the extended battery pack is controlled to discharge preferentially in accordance with the second charging and discharging control strategy.

[0054] It is understandable that, since the charging current and discharging current are acquired in real time, the subsequent charging current and subsequent discharging current can refer to the real-time charging current and real-time discharging current obtained again at a certain moment based on the BMS system of the main battery pack and the extended battery pack of the host after the extended outdoor power supply has been controlled to charge and discharge for a period of time according to the charging and discharging control strategy.

[0055] Similarly, the second charge / discharge control strategy can be a rule and algorithm used to determine the charge / discharge priority of the main battery pack and the extended battery pack. Specifically, the second charge / discharge control strategy can be used to control the discharge priority of the extended battery pack to be higher than that of the main battery pack. That is, when the expandable outdoor power supply is in a state of simultaneous charging and discharging, after the expandable outdoor power supply has been controlled to charge and discharge for a period of time according to the first charge / discharge control strategy, the real-time charging current and real-time discharging current at this moment can be obtained again, that is, the subsequent charging current is less than or equal to the subsequent discharging current. If it is detected that the subsequent charging current at this moment is less than or equal to the subsequent discharging current, then the first charge / discharge control strategy can be switched to the second charge / discharge control strategy, and based on the second charge / discharge control strategy, the extended battery pack can be controlled to discharge preferentially.

[0056] For example, let's consider an outdoor environment in the afternoon. A photovoltaic panel charges the main unit via a charging interface and discharges a terminal device via a discharging interface. Initially, with ample sunlight, the real-time charging current of the entire expandable outdoor power supply is high due to the large input current from the photovoltaic panel. The real-time discharging current is solely the output current supplying power to the terminal device. Since the detected real-time charging current is greater than the real-time discharging current, the first charge / discharge control strategy prioritizes charging the main battery pack and discharging the extended battery pack. In other words, all the charging current input from the photovoltaic panel is used to charge the main battery pack of the main unit. After some time, a cloud passes by, blocking the sunlight. The photovoltaic panel receives insufficient sunlight, and the real-time charging current of the entire expandable outdoor power supply decreases, potentially falling below the output current supplying power to the terminal device. If the subsequent charging current is found to be less than or equal to the subsequent discharging current, the first charge / discharge control strategy switches to the second charge / discharge control strategy, prioritizing the discharging of the extended battery pack. That is, only the extended battery pack is used to power the terminal device until all the extended battery packs are depleted, and then the main battery pack of the host is used to power the terminal device.

[0057] Alternatively, if the real-time charging current is less than or equal to the real-time discharging current, the extended battery pack can be controlled to discharge preferentially according to the second charge / discharge control strategy.

[0058] Similarly, when the expandable outdoor power supply is in a state of simultaneous charging and discharging, if the real-time charging current is detected to be less than or equal to the real-time discharging current, the expanded battery pack can be controlled to discharge preferentially based on the second charging and discharging control strategy.

[0059] Furthermore, if the subsequent charging current is detected to be greater than the subsequent discharging current, the system switches from the second charging / discharging control strategy to the first charging / discharging control strategy, and controls the main battery pack to be charged preferentially and the extended battery pack to be discharged in accordance with the first charging / discharging control strategy.

[0060] Similarly, when the expandable outdoor power supply is in a state of simultaneous charging and discharging, after the expandable outdoor power supply is controlled to charge and discharge for a period of time according to the second charge and discharge control strategy, the subsequent charging current and subsequent discharging current are obtained. If the subsequent charging current is detected to be less than or equal to the subsequent discharging current, the second charge and discharge control strategy can be switched to the first charge and discharge control strategy. Based on the first charge and discharge control strategy, the main battery pack is prioritized for charging, and the extended battery pack is controlled to discharge.

[0061] For example, taking a cloudy outdoor environment as an example, a photovoltaic panel charges the main unit through a charging interface and discharges a terminal device through a discharging interface. Initially, due to insufficient sunlight, the photovoltaic panel cannot generate enough power to supply the expandable outdoor power supply. At this time, the real-time charging current of the entire expandable outdoor power supply is less than or equal to the real-time discharging current supplying power to the terminal device. Therefore, according to the second charge / discharge control strategy, the extended battery pack is prioritized for discharging. That is, only the extended battery pack is used to provide the discharge current for supplying power to the terminal device. After a period of time, the sky clears, and the photovoltaic panel receives sufficient sunlight to generate greater power. At this time, the real-time charging current of the entire expandable outdoor power supply will increase accordingly, potentially exceeding the output current supplying power to the terminal device. When it is detected that the subsequent charging current exceeds the subsequent discharging current, the second charge / discharge control strategy can be switched to the first charge / discharge control strategy. According to the first charge / discharge control strategy, the main battery pack is prioritized for charging, while the extended battery pack is controlled for discharging. That is, only the extended battery pack is used to supply power to the terminal device, while all the charging current input from the photovoltaic panel is used to charge the main battery pack of the main unit.

[0062] In the above implementation, by continuously monitoring the charging and discharging currents of the expandable outdoor power supply in real time, the system can intelligently manage power flow based on real-time charging and discharging demands, ensuring the most efficient use of energy. When the charging current is greater than the discharging current, the main battery pack is charged first; when the discharging demand increases, the extended battery pack is used first to discharge, thereby reducing energy waste.

[0063] In some implementations, the method further includes:

[0064] If the subsequent charging current is still greater than the subsequent discharging current, the first charge and discharge control strategy continues to be followed, controlling the main battery pack to charge preferentially and controlling the extended battery pack to discharge.

[0065] Similarly, when the expandable outdoor power supply is in a simultaneous charging and discharging state, after controlling the expandable outdoor power supply to charge and discharge for a period of time according to the first charge and discharge control strategy, the real-time charging current and real-time discharging current at this moment can be obtained again, that is, the subsequent charging current is less than the subsequent discharging current. If it is detected that the subsequent charging current is still greater than the subsequent discharging current at this moment, the first charge and discharge control strategy can continue to be followed to control the main battery pack to charge first and control the expandable battery pack to discharge.

[0066] Alternatively, if the subsequent charging current is still less than or equal to the subsequent discharging current, the extended battery pack will continue to be discharged preferentially according to the second charge and discharge control strategy.

[0067] Similarly, when the expandable outdoor power supply is in a state of simultaneous charging and discharging, after controlling the expandable outdoor power supply to charge and discharge for a period of time according to the second charge and discharge control strategy, the subsequent charging current is less than and the subsequent discharging current is obtained. If it is detected that the subsequent charging current is still less than or equal to the subsequent discharging current, the expanded battery pack can continue to be controlled to discharge preferentially according to the second charge and discharge control strategy.

[0068] In the above implementation, the charging and discharging currents of the expandable outdoor power supply are continuously monitored in real time. Based on real-time charging and discharging demands, the system can respond quickly under different environmental conditions, ensuring a continuous and stable power supply and preventing task failures or equipment damage due to power outages. Furthermore, through this real-time data, the system can intelligently allocate power, meeting the power needs of external devices while ensuring sufficient energy storage in the main battery pack, thus enhancing the practicality and reliability of the outdoor power supply system.

[0069] In some implementations, there are multiple extended battery packs. The charging and discharging control strategy for the extended outdoor power supply is determined based on a comparison of the real-time charging current and real-time discharging current. Please refer to [reference needed]. Figure 2 ,include:

[0070] S210. When the real-time charging current is greater than the real-time discharging current, determine the respective state of charge of the main battery pack and multiple extended battery packs.

[0071] Among them, State of Charge (SOC) is an indicator used to describe the current charge level of a battery. It is usually expressed as a percentage and reflects the proportion of the battery's current stored electrical energy to its maximum capacity, that is, the battery's remaining charge.

[0072] Specifically, when the real-time charging current is greater than the real-time discharging current, the voltage, current, and temperature of each battery pack in the main battery pack and extension battery packs of the scalable outdoor power supply are monitored through their respective battery management systems (BMS), and the state of charge (SOC) of each battery pack is obtained. Optionally, the SOC of the main battery pack and multiple extension battery packs can be compared to determine which battery packs have higher and lower SOCs.

[0073] S220. If the main battery pack is determined to be in a state of not being fully charged based on its power status, the main battery pack is charged first according to the first charge and discharge control strategy, and then the multiple extended battery packs are charged according to their respective power statuses.

[0074] Specifically, if the main battery pack's state of charge (SOC) indicates it is not fully charged (below 100%), the first charge / discharge control strategy prioritizes fully charging the main battery pack. Furthermore, by comparing the SOCs of multiple extended battery packs, it determines which packs have higher SOCs and which have lower SOCs, and then selects the most suitable extended battery pack in sequence for charging.

[0075] In the above embodiments, the first charge-discharge control strategy is further refined by considering the respective power states of the main battery pack and multiple extended battery packs. This intelligently manages power flow, prioritizing sufficient power for the main battery pack while flexibly adjusting the charging plan based on the power states of the extended battery packs. This improves the reliability of the entire power system and the range of the outdoor power supply.

[0076] In some implementations, the multiple extended battery packs are charged according to their respective state of charge. Please refer to the appendix. Figure 3a ,include:

[0077] S310. After the main battery pack is fully charged, select the first battery pack with the highest power level and the lowest power level from among the multiple extended battery packs, and charge the first battery pack.

[0078] The first power threshold can be a predefined maximum power threshold for high-current charging of a single battery pack, based on the characteristics of the battery cells and the charging characteristics of the product. Specifically, the first power threshold can be an upper limit set for charging efficiency. When the power of the extended battery pack is lower than this power threshold, charging a single extended battery pack is faster than charging all extended battery packs. Conversely, when the power of the extended battery pack exceeds this power threshold, charging all extended battery packs exceeding this power threshold simultaneously is faster than charging each extended battery pack individually from the power threshold to 100% full charge.

[0079] The first battery pack can refer to a specific battery pack among multiple extended battery packs that meets the condition of needing priority charging. Specifically, after the main battery pack is fully charged, the battery pack with the lowest charge level that needs priority charging can be selected based on a first charge threshold. For example, if the first charge threshold is defined as SOC = 80%, please refer to... Figure 3b Therefore, considering the charging speed, the first battery pack with the highest power level and the lowest power level is selected. In other words, the expansion pack E with a SOC of 70% can be used as the first battery pack, and the expansion pack E is charged first.

[0080] It's important to understand that the selection of the first battery pack can also be determined by other conditions, and it doesn't always have to be the extended battery pack with the highest battery level and a charge level below the first charge threshold.

[0081] For example, if at a certain moment, the state of charge (SOC) of extension pack Y is 70% and the state of charge (SOC) of extension pack X is 50%, but if 10 minutes ago, extension pack Y was used for high-power discharge and the BMS system of the extension pack detected that the temperature of extension pack Y has reached 40 degrees Celsius, while extension pack X, although its SOC is 50%, has a temperature of only 30 degrees Celsius, then the first battery pack can choose extension pack X with a SOC of 50% instead of extension pack Y with a SOC of 70%.

[0082] Similarly, if at a certain moment the state of charge (SOC) of both extension pack M and extension pack N is the maximum SOC of all extension packs at that time (70%), and the cells in extension pack M are undergoing balancing, charging it with a large current could cause cell imbalance in extension pack M. Therefore, extension pack M cannot be selected as the first battery pack in this situation; instead, extension pack N should be selected as the first battery pack to be charged first.

[0083] S320. After the first battery pack reaches the first power threshold, repeat the selection and charging methods of the first battery pack until the power status of all extended battery packs with power status below the first power threshold reaches the first power threshold.

[0084] Specifically, whether the state of charge (SOC) of an extended battery pack has reached the threshold can be determined by whether the voltage is relatively consistent. It's important to understand that although the characteristics of cells made of different materials vary, and the internal resistance of extended battery packs also differs, there is still a linear relationship between the internal resistance of the cells and the voltage of the extended battery pack after charging and discharging. That is, by judging whether the voltage of the extended battery pack after charging and discharging is relatively consistent with the SOC threshold, one can approximately determine whether the SOC of each extended battery pack has reached the threshold.

[0085] Specifically, there are several key parameters in the design of extended battery packs: maximum charging current, maximum discharging current, and short-circuit current. When two extended battery packs with different voltage differentials are connected together, the battery pack with the higher voltage will discharge the battery pack with the lower voltage, resulting in a large instantaneous current. This could potentially cause the extended battery pack to short-circuit, trigger discharge protection, or charge protection. Therefore, when adding a new extended battery pack for joint charging and discharging, it is necessary to limit the connection voltage within a certain range and determine whether the state of charge of each extended battery pack is relatively consistent after connection.

[0086] For example, for a battery with lithium iron phosphate as the core, the parameters for selecting an extended battery pack are: maximum charging current 50A / 3s, discharging current 100A / 1s, short-circuit current 500A / 100us, internal resistance of the extended battery pack 10mΩ, and line impedance 30mΩ. Assuming no load influence, theoretically, the voltage difference without short-circuit protection at the instant two adjacent extended battery packs are connected in parallel is 500A*0.05Ω = 20V / 100us, the voltage difference without discharging protection is 100A*0.05Ω = 5V / 1s, and the voltage difference without charging protection is 50A*0.05Ω = 2.5V / 1s. Although the voltages of the batteries will change after being connected in parallel, and the voltage difference will gradually decrease until it reaches equilibrium, it is difficult to maintain the conditions for protection against discharge overcurrent and charging overcurrent. However, it can still be judged from the calculation results that if the working voltage and open circuit voltage of the two extended battery packs during charging and discharging do not exceed 3 to 5 volts, the charge status of the two extended battery packs is considered to be relatively consistent.

[0087] Furthermore, due to the cumulative error in measurement accuracy, even at the same state of charge, different extended battery packs will show different measured voltages. When the extended battery pack is in a medium state of charge (i.e., a medium State of Charge (SOC), the voltage deviation is small; when the extended battery pack is in an extreme state of charge (i.e., a maximum or minimum SOC), the voltage deviation is large. Therefore, based on prior experience, under extreme charge conditions, if the operating voltage and open-circuit voltage of the two extended battery packs during charging and discharging do not exceed 5 volts, their voltages can be considered relatively consistent; when the SOC is between 20% and 80%, a voltage not exceeding 3 volts can be considered relatively consistent.

[0088] Further, please continue to refer to Figure 3b After charging expansion pack E to its State of Charge (SOC) of 80%, which is the first charge threshold, the next expansion pack to be charged needs to be selected. Following the same method as selecting expansion pack E, the first battery pack with the highest SOC (50%) below the first charge threshold can be selected, and charging of expansion pack C continues. Similarly, after expansion pack C is charged to the first charge threshold, expansion pack D with its SOC of 30% can be selected as the new first battery pack, and charging of expansion pack D continues. Likewise, after charging expansion pack C to the first charge threshold, expansion pack A with its SOC of 15% is selected for charging. In other words, all expansion packs except expansion pack F (which is above the first charge threshold) are charged sequentially in the order of expansion pack E, expansion pack C, expansion pack D, and expansion pack A, until all expansion packs with SOC below the first charge threshold reach the first charge threshold of SOC = 80%.

[0089] S330: If a second battery pack is detected among multiple extended battery packs with a power level higher than the first power threshold but not fully charged, continue charging the extended battery pack whose power level has reached the first power threshold.

[0090] The second battery pack can also refer to a specific battery pack among multiple extended battery packs that meets the condition for priority charging. Specifically, after all extended battery packs whose state of charge is below the first threshold are charged to the first threshold, and also considering the charging speed, if a battery pack whose state of charge is above the first threshold but is not fully charged is detected among the multiple extended battery packs, it is designated as the second battery pack. Based on the state of charge of the second battery pack, all extended battery packs whose state of charge is below the state of charge of the second battery pack are charged together.

[0091] For example, please continue to refer to Figure 3bAfter charging all expansion packs except expansion pack F (which has a SOC of 80% or higher) to SOC = 80%, since there is an expansion pack F with a SOC of 90% that is above the first SOC threshold but not fully charged, expansion pack F can be used as the second battery pack. Using expansion pack F's SOC as a benchmark, charging continues for all expansion packs whose SOC has not reached 90%. In other words, after charging expansion packs E, C, D, and A to SOC = 80% in that order, since expansion pack F (which has a SOC of 80% but not yet 100%) is detected, expansion packs E, C, D, A, and B (which already has a SOC of 80%) can be charged together.

[0092] S340. If the power status of multiple extended battery packs reaches the second power threshold, charge the multiple extended battery packs according to the preset charging sequence until the multiple extended battery packs are fully charged.

[0093] The second power threshold is determined based on the state of charge (SOC) of the second battery pack. That is, the second power threshold can be the SOC of the second battery pack. The preset charging sequence refers to a pre-set charging order for the battery pack within the charging management system to optimize charging efficiency and battery life.

[0094] For example, please continue to refer to Figure 3b After charging expansion packs E, C, D, B, and A together until their state of charge (SOC) is relatively consistent with the second SOC threshold (i.e., relatively consistent with the SOC of expansion pack F at 90%), all expansion packs can then be charged simultaneously for faster charging speed, until all expansion packs are fully charged to 100% SOC. This completes the charging process for all expansion packs.

[0095] In the above implementation, combining theoretical calculations and specific prior experience, different battery packs are selected for charging sequentially. First, all battery packs are ensured to reach at least a basic charge level (first charge threshold), then gradually increased to a higher charge level (second charge threshold), and finally all battery packs are fully charged. Through this phased charging strategy, the system can ensure fair power distribution and healthy battery use, ensuring full utilization of energy when power supply is sufficient, and improving the efficiency and reliability of the entire system.

[0096] In some implementations, there are multiple extended battery packs. The charging and discharging control strategy for the extended outdoor power supply is determined based on a comparison of the real-time charging current and real-time discharging current. Please refer to the appendix. Figure 4 ,include:

[0097] S410. When the real-time charging current is less than or equal to the real-time discharging current, determine the state of charge of each of the multiple extended battery packs.

[0098] Similarly, when the real-time charging current is less than or equal to the real-time discharging current, the voltage, current and temperature of each battery pack in the main battery pack and the extended battery pack of the host in the scalable outdoor power supply are monitored by their respective battery management systems (BMS), and the state of charge (SOC) of each battery pack is obtained.

[0099] S420: According to the second charge and discharge control strategy, the multiple extended battery packs are controlled to discharge first based on their respective charge states.

[0100] Specifically, according to the second charge and discharge control strategy, and combined with the state of charge of each of the multiple extended battery packs, the comparison results obtained by comparing the state of charge of each of the multiple extended battery packs are used to determine which battery packs have higher charge and which have lower charge. Then, the most suitable extended battery pack is selected in sequence and used to discharge first.

[0101] S430: When the individual charges of multiple extended battery packs are all depleted, control the main battery pack to re-discharge.

[0102] Specifically, if further discharge is required after all extended battery packs have been discharged to a state of charge (SOC) of 0%, the main battery pack of the extended outdoor power supply unit can be controlled to discharge based on the second charge / discharge control strategy.

[0103] In the above implementation, by comparing the real-time charging current and the real-time discharging current, the system can intelligently decide whether to charge or discharge, thereby optimizing power usage and ensuring the continuity and stability of power supply. Simultaneously, when all extended battery packs are depleted, the system switches to the main battery pack for discharge, ensuring sufficient power supply at critical moments. Ultimately, through this control method, the scalable outdoor power system can manage power flow more intelligently and efficiently, improving power usage efficiency and system reliability, providing users with a more powerful and flexible power solution.

[0104] In some implementations, the discharge of multiple extended battery packs is controlled based on their respective state of charge. Please refer to the appendix. Figure 5 ,include:

[0105] S510: Select the third battery pack with the highest power level among multiple extended battery packs and whose power level is higher than the third power threshold, and control the third battery pack to discharge first.

[0106] The third charge threshold can also be a predefined minimum discharge charge threshold for a single battery pack, based on the characteristics of the battery cells and the product's discharge characteristics. Specifically, the third charge threshold can be a lower limit set to prevent excessive heat generation in the entire outdoor power system due to low-voltage, high-current discharge. It's understandable that during battery discharge, excessive current leads to increased heat generation from the battery's internal resistance, causing the battery temperature to rise. If a single extended battery pack experiences high-current discharge at low voltage, its internal resistance increases due to the voltage drop, exacerbating the heat generation problem. Therefore, a third charge threshold can be defined based on the characteristics of the battery cells. When the state of charge of all extended battery packs is below this third charge threshold, the output current is distributed by discharging multiple extended battery packs together, thereby reducing the discharge current of a single extended battery pack, reducing heat generation, and preventing battery damage due to overheating.

[0107] The third battery pack can refer to a specific battery pack among multiple extended battery packs that meets the priority discharge condition. Specifically, the battery pack with the highest capacity and the ability to discharge preferentially can be selected based on a third capacity threshold. For example, to protect the core of the battery pack, if the third capacity threshold is defined as SOC = 20%, then... (The rest of the text is missing). Figure 3b In the discharge state, the extension pack with the highest power and above the third power threshold can be selected as the third battery pack. That is, the extension pack F with SOC=90% can be used as the third battery pack, and the extension pack F can be used for discharge first.

[0108] S520. If the state of charge of the third battery pack reaches the third power threshold, repeat the selection and discharge methods of the third battery pack until the state of charge of all extended battery packs with a state of charge higher than the third power threshold reaches the third power threshold.

[0109] For example, please continue to refer to Figure 3bTo protect the core of the battery pack, once the state of charge (SOC) of the third battery pack reaches the third threshold (i.e., after discharging extension pack F until its SOC = 20%), another extension pack with the highest SOC and above the third threshold can be selected as the new third battery pack. This means extension pack B with an SOC of 80% can be selected and discharged until its SOC = 20%. Similarly, extension packs E (SOC = 70%), C (SOC = 50%), and D (SOC = 30%) can be discharged sequentially. This continues until all extension packs with an SOC above the third threshold have reached it—that is, except for extension pack A with an SOC of 15%, all extension packs have reached the third threshold of SOC = 20%.

[0110] S530: If a fourth battery pack is detected among multiple extended battery packs whose state of charge is lower than the third state of charge threshold and whose charge is not completely depleted, the extended battery pack whose state of charge has reached the third state of charge threshold shall be controlled to continue discharging.

[0111] Similarly, the fourth battery pack can also refer to a battery pack among multiple extended battery packs that meets the priority discharge condition. Specifically, all extended battery packs with a state of charge higher than the third state of charge threshold are discharged sequentially until their state of charge reaches the third state of charge threshold. Also for the protection of the battery core, if a battery pack with a state of charge lower than the third state of charge threshold but not completely empty is detected among the multiple extended battery packs, it can be used as the fourth battery pack, and based on the state of charge of the fourth battery pack, all extended battery packs with a state of charge reaching the third state of charge threshold are discharged together.

[0112] For example, please continue to refer to Figure 3b After all extension battery packs except extension pack A (which has a state of charge below the third threshold SOC = 20%) have been discharged sequentially to SOC = 20%, since an extension pack with a state of charge below the third threshold but not completely empty (i.e., extension pack A with a state of charge of SOC = 15%) is detected, extension pack A can be designated as the fourth battery pack. Using extension pack A's state of charge as a benchmark, all extension battery packs with a state of charge below SOC = 15% will continue to be discharged. In other words, after controlling extension packs F, B, E, C, and D to discharge to SOC = 20% in that order, since extension pack A (which has a state of charge below SOC = 20% but not yet SOC = 0%) is detected, extension packs F, B, E, C, and D will continue to be discharged together.

[0113] S540: When the power status of multiple extended battery packs reaches the fourth power threshold, control the multiple extended battery packs to discharge according to the preset discharge sequence until the power of each of the multiple extended battery packs is empty.

[0114] The fourth power threshold is determined based on the state of charge (SOC) of the fourth battery pack. That is, the fourth power threshold can be the SOC of the fourth battery pack. The preset discharge sequence refers to a pre-set order in which the battery pack discharges to optimize discharge efficiency and battery life.

[0115] For example, please continue to refer to Figure 3b After controlling expansion packs F, B, E, C, and D to discharge together until their state of charge (SOC) is relatively consistent with the fourth SOC threshold (i.e., relatively consistent with the SOC of expansion pack A at 15%), for the protection of the battery pack's core, all expansion packs can be simultaneously controlled to discharge until all expansion packs are discharged to SOC = 0%. Furthermore, if further discharge is needed after all expansion packs have discharged to SOC = 0%, the main battery pack of the expandable outdoor power unit can be used for discharge based on the second charge / discharge control strategy.

[0116] In the above embodiments, by setting different power thresholds, the scalable outdoor power system can avoid the battery pack from undergoing high-current discharge at low voltage, reducing the risk of battery overheating and damage, thereby protecting the battery pack's core. By distributing the output current, the discharge current of individual battery packs can also be reduced, reducing heat generation and improving the overall discharge efficiency of the outdoor power system. Simultaneously, the system prioritizes discharging the extended battery packs with higher power capacity, thus balancing the use of each battery pack and preventing some battery packs from aging prematurely due to frequent discharge.

[0117] This specification also provides a charging and discharging control method applied to a scalable outdoor power supply. The scalable outdoor power supply has a main battery pack and multiple extension battery packs connected in parallel. The method includes the following steps:

[0118] S602. When it is detected that the expandable outdoor power supply is in a state of simultaneous charging and discharging, determine the real-time charging current and real-time discharging current of the expandable outdoor power supply.

[0119] S604. When the real-time charging current is greater than the real-time discharging current, determine the state of charge of the main battery pack and multiple extended battery packs respectively.

[0120] S606. If it is determined from the power status of the main battery pack that the main battery pack is not fully charged, the main battery pack shall be fully charged first in accordance with the first charge and discharge control strategy.

[0121] S608. After the main battery pack is fully charged, select the first battery pack with the highest power level and the lowest power level from among the multiple extended battery packs, and charge the first battery pack.

[0122] S610. After the power state of the first battery pack reaches the first power threshold, repeat the above selection method and charging method of the first battery pack until the power state of the extended battery packs that are lower than the first power threshold all reach the first power threshold.

[0123] S612. If a second battery pack is detected among multiple extended battery packs with a power status higher than the first power threshold but not fully charged, continue charging the extended battery pack whose power status has reached the first power threshold.

[0124] S614. If the power status of multiple extended battery packs reaches the second power threshold, the multiple extended battery packs are charged according to a preset charging sequence until the multiple extended battery packs are fully charged; wherein, the second power threshold is determined based on the power status of the second battery pack.

[0125] S616. If it is detected that the subsequent charging current is still greater than the subsequent discharging current, continue to follow the first charging and discharging control strategy to control the main battery pack to charge first and control the extended battery pack to discharge.

[0126] S618. If the subsequent charging current is detected to be less than or equal to the subsequent discharging current, the first charging and discharging control strategy is switched to the second charging and discharging control strategy, and the extended battery pack is controlled to discharge preferentially in accordance with the second charging and discharging control strategy.

[0127] S620. When the real-time charging current is less than or equal to the real-time discharging current, determine the state of charge of each of the multiple extended battery packs.

[0128] S622. According to the second charge and discharge control strategy, select the third battery pack with the largest capacity and higher than the third capacity threshold from multiple extended battery packs, and control the third battery pack to discharge first.

[0129] S624. If the state of charge of the third battery pack reaches the third power threshold; repeat the above selection method and discharge method of the third battery pack until the state of charge of the extended battery packs with a state of charge higher than the third power threshold all reach the third power threshold.

[0130] S626. If a fourth battery pack is detected among multiple extended battery packs whose power status is lower than the third power threshold and whose power is not depleted, the extended battery pack whose power status has reached the third power threshold shall be controlled to continue discharging.

[0131] S628. When the state of charge of multiple extended battery packs reaches the fourth power threshold, the multiple extended battery packs are controlled to discharge according to a preset discharge sequence until the power of each of the multiple extended battery packs is empty; wherein, the fourth power threshold is determined based on the state of charge of the fourth battery pack.

[0132] S630: When the individual charges of multiple extended battery packs are all depleted, control the main battery pack to re-discharge.

[0133] S632. If the subsequent charging current is still less than or equal to the subsequent discharging current, continue to control the extended battery pack to discharge preferentially according to the second charging and discharging control strategy.

[0134] S634. If the subsequent charging current is detected to be greater than the subsequent discharging current, the system switches from the second charging and discharging control strategy to the first charging and discharging control strategy, and controls the main battery pack to be charged preferentially and the extended battery pack to be discharged in accordance with the first charging and discharging control strategy.

[0135] S636. Based on the comparison results of the real-time charging current and the real-time discharging current, determine the charging and discharging control strategy for the expandable outdoor power supply. The charging and discharging control strategy is used to control the charging priority of the main battery pack to be higher than the charging priority of the extended battery pack; or, the charging and discharging control strategy is used to control the discharging priority of the extended battery pack to be higher than the discharging priority of the main battery pack.

[0136] It should be understood that although the steps in the flowchart above are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart above may include multiple steps or stages, which are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps.

[0137] This specification also provides a scalable outdoor power supply, which includes a main battery pack and an extension battery pack connected in parallel. The parallel management system of the scalable outdoor power supply is used to perform the steps of any of the methods described above.

[0138] For specific limitations regarding a scalable outdoor power supply, please refer to the limitations of a charging and discharging control method described above, which will not be repeated here. Each module in the aforementioned scalable outdoor power supply can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0139] In this embodiment, a scalable outdoor power supply is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above-mentioned functions.

[0140] This embodiment also provides a power system, including the aforementioned expandable outdoor power supply. For specific limitations of a power system, please refer to the limitations of the charging and discharging control method above, which will not be repeated here.

[0141] The charging and discharging control method, scalable outdoor power supply, and power system described in the above embodiments can be implemented by a computer chip or physical entity, or by a product with a certain function. A typical implementation device is a computer. Specifically, the computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0142] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0143] This application is described with reference to flowchart illustrations and / or block diagrams of a charge / discharge control method, an expandable outdoor power supply, and a power system according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams.

[0144] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0145] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0146] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0147] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0148] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0149] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A charge and discharge control method, characterized in that: Applied to an expandable outdoor power supply, the expandable outdoor power supply has a main battery pack and an expansion battery pack connected in parallel; the method comprises: Determining a real-time charging current and a real-time discharging current of the expandable outdoor power supply; The charge and discharge control strategy of the expandable outdoor power supply is determined based on the comparison result of the current magnitudes of the real-time charging current and the real-time discharging current; wherein the charge and discharge control strategy is used to control the charging priority of the main battery pack to be higher than the charging priority of the extended battery pack; or, the charge and discharge control strategy is used to control the discharging priority of the extended battery pack to be higher than the discharging priority of the main battery pack.

2. The method according to claim 1, wherein determining the real-time charging current and the real-time discharging current of the expandable outdoor power supply comprises: When it is detected that the expandable outdoor power supply is in a charging and discharging state, a real-time charging current and a real-time discharging current of the expandable outdoor power supply are determined.

3. The method according to claim 2, wherein determining the charge and discharge control strategy of the expandable outdoor power supply according to the current magnitude comparison result of the real-time charging current and the real-time discharging current comprises: In the case where the real-time charging current is greater than the real-time discharging current, according to the first charging and discharging control strategy, the main battery pack is controlled to be charged first, and the extended battery pack is controlled to be discharged; if it is detected that the subsequent charging current is less than or equal to the subsequent discharging current, the first charging and discharging control strategy is switched to the second charging and discharging control strategy, and according to the second charging and discharging control strategy, the extended battery pack is controlled to be discharged first; or When the real-time charging current is less than or equal to the real-time discharging current, the extended battery pack is controlled to discharge preferentially according to the second charging and discharging control strategy; if it is detected that the subsequent charging current is greater than the subsequent discharging current, the second charging and discharging control strategy is switched to the first charging and discharging control strategy, and according to the first charging and discharging control strategy, the main battery pack is controlled to be charged preferentially and the extended battery pack is controlled to discharge.

4. The method according to claim 3, further comprising: If it is detected that the subsequent charging current is still greater than the subsequent discharging current, continuing to control the main battery pack to be charged first and the extended battery pack to be discharged according to the first charging and discharging control strategy; or If it is detected that the subsequent charging current is still less than or equal to the subsequent discharging current, the second charging and discharging control strategy is continued to be used to control the extended battery pack to perform preferential discharge.

5. According to the method of claim 1, the number of the extended battery packs is multiple; the determining the charge and discharge control strategy of the expandable outdoor power supply according to the current magnitude comparison result of the real-time charging current and the real-time discharging current comprises: When the real-time charging current is greater than the real-time discharging current, determining the power state of the main battery pack and the plurality of extended battery packs; If it is determined according to the power status of the main battery pack that the main battery pack is in an undercharged state, according to the first charge and discharge control strategy, the main battery pack is controlled to be fully charged first, and then the multiple extended battery packs are charged according to their respective power statuses.

6. The method according to claim 5, wherein charging the plurality of extended battery packs according to respective power states of the plurality of extended battery packs comprises: After the main battery pack is fully charged, selecting a first battery pack having a power state lower than a first power threshold and the largest power among the plurality of extended battery packs, and charging the first battery pack; After the power state of the first battery pack reaches the first power threshold, repeating the above-mentioned selection method and charging method of the first battery pack until the power states of the extended battery packs whose power states are lower than the first power threshold all reach the first power threshold; If a second battery pack whose power state is higher than the first power threshold and whose power is not full is detected among the plurality of extended battery packs, continue charging the extended battery pack whose power state reaches the first power threshold; If the power states of the multiple extended battery packs all reach a second power threshold, the multiple extended battery packs are charged in a preset charging order until the multiple extended battery packs are fully charged; wherein the second power threshold is determined based on the power state of the second battery pack.

7. According to the method of claim 1, the number of the extended battery packs is multiple; the determining the charge and discharge control strategy of the expandable outdoor power supply according to the current magnitude comparison result of the real-time charging current and the real-time discharging current comprises: When the real-time charging current is less than or equal to the real-time discharging current, determining the power state of each of the plurality of extended battery packs; According to the second charge and discharge control strategy, the plurality of extended battery packs are controlled to discharge first according to the respective power states of the plurality of extended battery packs; When the power of each of the plurality of extended battery packs is empty, the main battery pack is controlled to discharge again.

8. The method according to claim 7, wherein the step of controlling the plurality of extended battery packs to discharge first according to the respective power states of the plurality of extended battery packs comprises: Selecting a third battery pack with the largest amount of power and higher than a third power threshold from the plurality of extended battery packs, and controlling the third battery pack to discharge first; If the power state of the third battery pack reaches the third power threshold; repeat the above-mentioned selection method and discharge method of the third battery pack until the power states of the extended battery packs whose power states are higher than the third power threshold all reach the third power threshold; If a fourth battery pack whose power state is lower than the third power threshold and whose power is not empty is detected among the plurality of extended battery packs, controlling the extended battery pack whose power state reaches the third power threshold to continue discharging; When the power states of the multiple extended battery packs reach a fourth power threshold, the multiple extended battery packs are controlled to discharge in a preset discharge order until the power of each of the multiple extended battery packs is empty; wherein the fourth power threshold is determined based on the power state of the fourth battery pack.

9. An expandable outdoor power supply, characterized in that: The expandable outdoor power supply includes a main battery pack and an extended battery pack connected in parallel. The parallel management system of the expandable outdoor power supply is used to execute the method described in any one of claims 1 to 8 above.

10. A power supply system, characterized in that: Includes the expandable outdoor power supply as described in claim 9.

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