Battery protection method and device based on dynamic resistance adjustment, storage medium and product

Abstract

The application discloses a battery protection method and device based on dynamic resistance adjustment, a storage medium and a product, relates to the technical field of battery protection, and determines a charging safety threshold and a discharging safety threshold of an energy storage battery based on operation parameters of the energy storage battery; calculates target resistance values corresponding to charging conditions and discharging conditions respectively based on electrical parameters of a multi-lift circuit, the charging safety threshold and the discharging safety threshold; and controls the switching state of a switch array in an adjustable resistance network, so as to adjust the equivalent resistance of a charging current-limiting branch and a discharging current-limiting branch to the corresponding target resistance values respectively. The application realizes the accurate matching of charging and discharging currents with the real-time state of a battery pack and multi-lift conditions, guarantees the safety of the energy storage battery, reduces the safety risk of the battery, improves the stability of system operation, and improves the energy recovery efficiency.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery protection method, device, storage medium and product based on dynamic resistance adjustment. Background Technology

[0002] In elevator energy recovery systems, the energy storage battery, as the storage carrier of regenerated energy, directly determines the reliability and service life of the system through its safe and stable operation. In practical applications, the operating states of multiple elevators, such as heavy-load downward movement during morning rush hour and light-load upward movement during evening rush hour, exhibit randomness and superposition, causing the charging and discharging current flowing to the energy storage battery to exhibit dynamic fluctuations. Simultaneously, the safe load-bearing capacity of the energy storage battery dynamically changes with its own state of charge, temperature, and health status, requiring differentiated charging and discharging current limiting standards under different operating conditions.

[0003] In traditional solutions, current limiting in elevator energy recovery systems often uses fixed resistors or relies on the elevator's existing braking unit for current control. These methods only provide a coarse-grained current limiting based on fixed standards. This makes it difficult to consistently match the charging and discharging current to the real-time safe carrying capacity of the energy storage battery. When current peaks accumulate or the battery condition deteriorates, the current can easily exceed the safety threshold, leading to battery overheating, lifespan degradation, and even thermal runaway, severely impacting the long-term stable operation of the energy storage battery and the entire energy recovery system. Summary of the Invention

[0004] The main purpose of this application is to provide a battery protection method, device, storage medium and product based on dynamic resistance adjustment, which aims to solve the technical problem that traditional solutions cannot accurately control the charging and discharging current of the battery pack, resulting in safety risks to the energy storage battery and affecting the stability of system operation.

[0005] To achieve the above objectives, this application proposes a battery protection method based on dynamic resistance adjustment, applied to an elevator energy recovery system. The elevator energy recovery system includes multiple elevator circuits, an energy storage battery, and an adjustable resistor network. The adjustable resistor network includes a charging current-limiting branch and a discharging current-limiting branch. The adjustable resistor network is connected in series between the energy storage battery and the multiple elevator circuits. The battery protection method based on dynamic resistance adjustment includes:

[0006] Based on the operating parameters of the energy storage battery, the charging safety threshold and the discharging safety threshold of the energy storage battery are determined.

[0007] Based on the electrical parameters of the multiple elevator circuits, the charging safety threshold, and the discharging safety threshold, calculate the target resistance values ​​corresponding to the charging and discharging conditions, respectively.

[0008] The switching state of the switch array in the adjustable resistor network is controlled to adjust the equivalent resistance of the charging current limiting branch and the discharging current limiting branch to the corresponding target resistance values, so as to regulate the total current flowing through the energy storage battery.

[0009] In one embodiment, the operating parameters include state of charge and temperature data, and the step of determining the charging safety threshold and discharging safety threshold of the energy storage battery based on the operating parameters of the energy storage battery includes:

[0010] Based on the real-time collected state of charge and temperature data, the charging safety threshold and the discharging safety threshold are obtained by matching from the preset battery safe operating area data table.

[0011] In one embodiment, the electrical parameters include DC bus voltage and loop current. The step of calculating the target resistance values ​​corresponding to the charging and discharging conditions based on the electrical parameters of the multiple elevator circuits, the charging safety threshold, and the discharging safety threshold includes:

[0012] Based on the DC bus voltage and the voltage of the energy storage battery, determine the charging and discharging operating voltages of the elevator energy recovery system.

[0013] Based on the charging operating voltage, the discharging operating voltage, the charging safety threshold, and the discharging safety threshold, the total resistance of the charging circuit and the total resistance of the discharging circuit are calculated.

[0014] Obtain the inherent internal resistance of the elevator energy recovery system, calculate the difference between the total resistance of the charging circuit and the total resistance of the discharging circuit and the inherent internal resistance, and obtain the target resistance values ​​corresponding to the charging and discharging conditions, respectively.

[0015] In one embodiment, the step of obtaining the inherent internal resistance of the elevator energy recovery system includes:

[0016] All switches in the charging current limiting branch and the discharging current limiting branch of the adjustable resistor network are closed, so that the equivalent resistance of the adjustable resistor network is zero.

[0017] The peak charging current and peak discharging current flowing through the multiple elevator circuits are detected under the charging condition and the discharging condition, respectively.

[0018] The inherent resistance of the elevator energy recovery system under charging and discharging conditions is calculated by comparing the charging operating voltage and the discharging operating voltage with the peak charging current and the peak discharging current, respectively.

[0019] In one embodiment, the step of controlling the switching state of the switch array in the adjustable resistor network to adjust the equivalent resistances of the charging current-limiting branch and the discharging current-limiting branch to their respective target resistance values ​​includes:

[0020] Based on the target resistance values ​​corresponding to the charging and discharging conditions, the resistance branches connected to the charging current limiting branch and the discharging current limiting branch are determined respectively.

[0021] By controlling the on / off state of the controllable switches of each resistor branch, the determined resistor branches are respectively connected to the charging current limiting branch and the discharging current limiting branch.

[0022] In one embodiment, after the step of controlling the switching state of the switch array in the adjustable resistor network and adjusting the equivalent resistances of the charging current-limiting branch and the discharging current-limiting branch to their respective target resistance values, the method further includes:

[0023] The energy flow direction of each elevator is determined based on the electrical parameters of the multiple elevator circuits and the operating parameters of the energy storage battery.

[0024] The equivalent resistance of the adjustable resistor network is dynamically adjusted based on the energy flow direction of each elevator.

[0025] In one embodiment, the step of dynamically adjusting the equivalent resistance of the adjustable resistor network based on the energy flow direction of each elevator includes:

[0026] When the energy flow of each elevator is superimposed in the same direction and flows to the energy storage battery, the target resistance value is increased, and the equivalent resistance of the adjustable resistor network is adjusted according to the increased target resistance value.

[0027] When the energy flow directions of each elevator are opposite and cancel each other out, the target resistance value is reduced, and the equivalent resistance of the adjustable resistor network is adjusted according to the reduced target resistance value.

[0028] In addition, to achieve the above objectives, this application also proposes an electronic device, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the battery protection method based on dynamic resistance adjustment as described above.

[0029] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the battery protection method based on dynamic resistance adjustment as described above.

[0030] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the battery protection method based on dynamic resistance adjustment as described above.

[0031] One or more technical solutions proposed in this application have at least the following technical effects:

[0032] In this embodiment, based on the operating parameters of the energy storage battery, the charging safety threshold and discharging safety threshold of the energy storage battery are determined. Based on the electrical parameters of the multiple elevator circuits, the charging safety threshold, and the discharging safety threshold, the target resistance values ​​corresponding to the charging and discharging conditions are calculated respectively. The switching state of the switch array in the adjustable resistor network is controlled to adjust the equivalent resistance of the charging current-limiting branch and the discharging current-limiting branch to the corresponding target resistance values, thereby regulating the total current flowing through the energy storage battery. That is, in this embodiment, by collecting the operating parameters of the energy storage battery in real time, the charging safety threshold and discharging safety threshold are dynamically determined based on the operating parameters, so that the current limit standard is accurately adapted to the current state of the energy storage battery. By synchronously collecting the electrical parameters of the multiple elevator circuits and combining them with the charging and discharging safety thresholds, the target resistance values ​​for the charging and discharging conditions are calculated respectively, achieving differentiated control of the resistance required for different operating conditions. By controlling the on / off state of the switch array in the adjustable resistor network, the equivalent resistance of the two branches is adjusted to the target resistance values ​​of the corresponding operating conditions, ensuring that the charging current and discharging current are stable within their respective safety thresholds. This system achieves dynamic matching between the charging and discharging current of the elevator energy recovery system and the real-time safe carrying capacity of the energy storage battery. Under poor battery operating conditions, the current is strictly limited to avoid the risk of overheating and runaway. It also achieves precise matching between the charging and discharging current and the real-time status of the battery pack, as well as various elevator operating conditions. This ensures the safety of the energy storage battery, reduces battery safety risks, improves system stability, and enhances energy recovery efficiency. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a flowchart illustrating the first embodiment of the battery protection method based on dynamic resistance adjustment in this application;

[0036] Figure 2 This is a schematic diagram of the elevator energy recovery system provided in the first embodiment of this application;

[0037] Figure 3 A schematic diagram of the circuit structure of the multiple elevator loops provided in the first embodiment of this application;

[0038] Figure 4 A schematic diagram of the circuit structure of the adjustable resistor network provided in the first embodiment of this application;

[0039] Figure 5 This is a flowchart illustrating the second embodiment of the battery protection method based on dynamic resistance adjustment in this application;

[0040] Figure 6 This is a schematic diagram of the device structure of the hardware operating environment involved in the battery protection method based on dynamic resistance adjustment in the embodiments of this application.

[0041] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0043] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0044] The main solution of this application embodiment is as follows: based on the operating parameters of the energy storage battery, determine the charging safety threshold and the discharging safety threshold of the energy storage battery; based on the electrical parameters of the multi-elevator circuit, the charging safety threshold, and the discharging safety threshold, calculate the target resistance values ​​corresponding to the charging and discharging conditions respectively; control the switching state of the switch array in the adjustable resistor network, and adjust the equivalent resistance of the charging current limiting branch and the discharging current limiting branch to the corresponding target resistance values ​​respectively, so as to regulate the total current flowing through the energy storage battery.

[0045] In elevator energy recovery systems, the energy storage battery, as the storage carrier of regenerated energy, directly determines the reliability and service life of the system through its safe and stable operation. In practical applications, the operating states of multiple elevators, such as heavy-load downward movement during morning rush hour and light-load upward movement during evening rush hour, exhibit randomness and superposition, causing the charging and discharging current flowing to the energy storage battery to exhibit dynamic fluctuations. Simultaneously, the safe load-bearing capacity of the energy storage battery dynamically changes with its own state of charge, temperature, and health status, requiring differentiated charging and discharging current limiting standards under different operating conditions.

[0046] In traditional solutions, current limiting in elevator energy recovery systems often uses fixed resistors or relies on the elevator's existing braking unit for current control. These methods only provide a coarse-grained current limiting based on fixed standards. This makes it difficult to consistently match the charging and discharging current to the real-time safe carrying capacity of the energy storage battery. When current peaks accumulate or the battery condition deteriorates, the current can easily exceed the safety threshold, leading to battery overheating, lifespan degradation, and even thermal runaway, severely impacting the long-term stable operation of the energy storage battery and the entire energy recovery system.

[0047] In this embodiment, based on the operating parameters of the energy storage battery, the charging safety threshold and discharging safety threshold of the energy storage battery are determined. Based on the electrical parameters of the multiple elevator circuits, the charging safety threshold, and the discharging safety threshold, the target resistance values ​​corresponding to the charging and discharging conditions are calculated respectively. The switching state of the switch array in the adjustable resistor network is controlled to adjust the equivalent resistance of the charging current-limiting branch and the discharging current-limiting branch to the corresponding target resistance values, thereby regulating the total current flowing through the energy storage battery. That is, in this embodiment, by collecting the operating parameters of the energy storage battery in real time, the charging safety threshold and discharging safety threshold are dynamically determined based on the operating parameters, so that the current limit standard is accurately adapted to the current state of the energy storage battery. By synchronously collecting the electrical parameters of the multiple elevator circuits and combining them with the charging and discharging safety thresholds, the target resistance values ​​for the charging and discharging conditions are calculated respectively, achieving differentiated control of the resistance required for different operating conditions. By controlling the on / off state of the switch array in the adjustable resistor network, the equivalent resistance of the two branches is adjusted to the target resistance values ​​of the corresponding operating conditions, ensuring that the charging current and discharging current are stable within their respective safety thresholds. This system achieves dynamic matching between the charging and discharging current of the elevator energy recovery system and the real-time safe carrying capacity of the energy storage battery. When the battery is in poor operating condition, the current is strictly limited to avoid the risk of overheating and runaway. When the battery is in good operating condition, the current-limiting redundancy is released to improve energy recovery efficiency. This approach ensures the safety of the energy storage battery, reduces battery safety risks, improves system stability, and enhances energy recovery efficiency.

[0048] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication and program execution functions, such as an elevator energy recovery system, an industrial control calculator, or an electronic device capable of performing the above functions.

[0049] Based on this, embodiments of this application provide a battery protection method based on dynamic resistance adjustment, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the battery protection method based on dynamic resistance adjustment in this application.

[0050] In this embodiment, the battery protection method based on dynamic resistance adjustment is applied to an elevator energy recovery system. The elevator energy recovery system includes multiple elevator circuits, an energy storage battery, and an adjustable resistor network. The adjustable resistor network includes a charging current limiting branch and a discharging current limiting branch. The adjustable resistor network is connected in series between the energy storage battery and the multiple elevator circuits.

[0051] For example, please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of the elevator energy recovery system provided in the first embodiment of this application. The elevator energy recovery system includes multiple elevator circuits, an energy detection unit, an energy storage battery, a battery monitoring unit, a power grid, a conversion device, and an adjustable resistor network.

[0052] Specifically, the power grid, acting as a backup power supply unit for the elevator energy recovery system, is connected to multiple elevator circuits via a conversion device. When the energy storage battery is low or the elevator is under high load, it replenishes the elevator energy recovery system with electrical energy. The multiple elevator circuits correspond to the DC bus side of each elevator connected to the elevator energy recovery system, serving as the collection and distribution nodes for regenerated and driving energy. The power detection unit, connected to the multiple elevator circuits, monitors key electrical parameters of the elevator energy recovery system in real time, such as DC bus voltage and current in each circuit. The energy storage battery is the core energy storage unit of the elevator energy recovery system, storing the electrical energy regenerated by the elevator and providing auxiliary driving energy to the elevator when needed. The battery monitoring unit, connected to the energy storage battery, monitors and reports key status parameters such as battery voltage, temperature, and state of charge in real time. The conversion device is typically a bidirectional AC / DC converter, used to achieve bidirectional energy conversion between the grid AC power and the elevator energy recovery system DC bus. The charging current-limiting branch and discharging current-limiting branch of the adjustable resistor network are connected in series in the charging and discharging paths between the energy storage battery and the DC bus, respectively. By changing its internal switching state, the equivalent resistance value of the connected circuit is dynamically adjusted, thereby achieving real-time, bidirectional, and precise limitation of battery charging and discharging current.

[0053] The battery protection method based on dynamic resistance adjustment includes steps S10~S30:

[0054] Step S10: Based on the operating parameters of the energy storage battery, determine the charging safety threshold and discharging safety threshold of the energy storage battery.

[0055] It should be noted that, due to the severe disconnect between existing current-limiting logic and the state and operating characteristics of energy storage batteries, fixed current-limiting thresholds cannot respond to changes in the battery's state, and a single current-limiting loop cannot adapt to the differentiated charging and discharging requirements. Therefore, this application collects the operating parameters of the energy storage battery in real time, determines the charging safety threshold and discharging safety threshold based on these parameters, calculates the target resistance value in conjunction with elevator electrical parameters, and finally achieves precise resistance adjustment of the adjustable resistor network through dual independent branches. This ensures both the safety of the energy storage battery and improves the recovery efficiency of the elevator energy recovery system. Operating parameters refer to core parameters that reflect the real-time operating state of the energy storage battery, including state of charge and temperature data. These parameters are crucial for determining the battery's safe load-bearing capacity. The charging safety threshold refers to the maximum allowable charging current value set to avoid overcharging and damage to the battery under the current battery state; it is the upper limit standard for current during charging. The discharging safety threshold refers to the maximum allowable discharging current value set to avoid over-discharging and damage to the battery under the current battery state; it is the upper limit standard for current during discharging.

[0056] Understandably, existing technologies typically employ fixed charging and discharging current limiting standards, which cannot adapt to dynamic changes in battery status. This results in excessive current limiting redundancy when the battery is in good condition and insufficient current limiting when the battery is in poor condition. This application collects the operating parameters of the energy storage battery in real time and uses these operating parameters to determine the charging safety threshold and discharging safety threshold of the energy storage battery under different conditions. This achieves dynamic binding between the energy storage battery safety threshold and the real-time battery status, enabling the current limiting standard to adaptively adjust with changes in battery operating parameters, thus ensuring the operational safety of the energy storage battery under different operating conditions.

[0057] For example, when the state of charge of the energy storage battery is 80% and the temperature is 35°C, the charging safety threshold is determined to be 5A and the discharging safety threshold is 8A based on the datasheet. When the state of charge of the energy storage battery drops to 20% and the temperature is 10°C, the charging safety threshold is determined to be 10A and the discharging safety threshold is 4A.

[0058] In one feasible implementation, the operating parameters include state of charge and temperature data, and the step of determining the charging safety threshold and discharging safety threshold of the energy storage battery based on the operating parameters of the energy storage battery includes:

[0059] Based on the real-time collected state of charge and temperature data, the charging safety threshold and the discharging safety threshold are obtained by matching from the preset battery safe operating area data table.

[0060] It should be noted that the preset battery safe operating area data table is a multi-dimensional mapping table pre-calibrated based on the electrochemical characteristics of the energy storage battery and experimental data. The table uses state of charge and temperature as input indices, and outputs the maximum charging current and maximum discharging current that the energy storage battery can safely and sustainably operate under these operating conditions. By querying the preset battery safe operating area data table to match the charging safety threshold and discharging safety threshold, the nonlinear safety boundary of the battery can be more realistically reflected, and the accurate charging safety threshold and discharging safety threshold of the energy storage battery under different operating conditions can be obtained.

[0061] Understandably, determining the charge and discharge safety thresholds of energy storage batteries through table lookup and matching offers advantages such as high execution efficiency and deterministic reliability, making it suitable for embedded environments with high real-time requirements, such as elevator control systems. This avoids the processor burden and latency caused by complex calculations, ensuring the immediacy and reliability of current limiting decisions. Furthermore, this preset battery safety operating area data table can be periodically calibrated or updated based on the actual aging of the battery, thereby maintaining accurate protection capabilities throughout the entire battery lifespan.

[0062] For example, the preset battery safety operating area data table can be a two-dimensional matrix. For instance, the state of charge (SOC) ranges from 0% to 100% in 5% increments, and the temperature ranges from -10°C to 50°C in 5°C increments, forming a matrix. When the SOC is 78% and the temperature is 32°C, the corresponding charging safety threshold and discharging safety threshold can be quickly obtained from the table through a nearest-neighbor lookup or bilinear interpolation algorithm.

[0063] Step S20: Based on the electrical parameters of the multiple elevator circuits, the charging safety threshold, and the discharging safety threshold, calculate the target resistance values ​​corresponding to the charging and discharging conditions, respectively.

[0064] It should be noted that electrical parameters refer to the core parameters in a multi-elevator circuit that reflect the state of power transmission, including DC bus voltage and circuit current. Charging mode refers to the elevator's operation in a power generation state, where regenerated energy charges the energy storage battery. Discharging mode refers to the elevator's operation in a motoring state, where the energy storage battery outputs power to the elevator.

[0065] Understandably, the direction of energy transmission and voltage difference in elevator energy recovery systems differ fundamentally between charging and discharging conditions. Therefore, it is necessary to calculate the target resistance value separately for each elevator based on its electrical parameters and corresponding safety thresholds to ensure accurate current limiting under both charging and discharging conditions. By calculating the precise current-limiting target resistance value adapted to different operating conditions using electrical parameters and charging / discharging safety thresholds, it is possible to ensure that the charging and discharging current does not exceed the safe carrying capacity of the energy storage battery while also adapting to the directional characteristics of energy transmission.

[0066] For example, based on the detected electrical parameters of multiple elevator circuits and the operating status of the energy storage battery, the charging safety threshold is determined as follows: the current DC bus voltage is 710V, the charging safety threshold is 7A, and the energy storage battery voltage is 690V. If an elevator is currently in a heavy-load downward power generation state, i.e., charging condition, the operating voltage of the elevator energy recovery system is first calculated as the current DC bus voltage minus the energy storage battery voltage, which equals 20V. According to Ohm's law, to limit the charging current to within 7A, the total resistance required for the charging circuit should be 2.857Ω. At this time, the inherent internal resistance of the elevator energy recovery system is 0.3Ω. Finally, the target resistance value that the charging current-limiting branch in the adjustable resistor network needs to provide under charging conditions is calculated to be 2.557Ω. If at another moment an elevator is in a light-load upward motoring state, i.e., in discharge mode, and the discharge safety threshold is 10A, the current DC bus voltage is 660V, and the energy storage battery voltage is 680V, ​​then in discharge mode, the working voltage of the elevator energy recovery system is 20V, the total resistance of the discharge circuit is 2Ω, and the target resistance value in discharge mode is 1.7Ω.

[0067] See Figure 3 , Figure 3 This is a schematic diagram of the circuit structure of the multi-elevator circuit provided in the first embodiment of this application. The multi-elevator circuit includes a positive-side circuit control switch and a negative-side circuit control switch. Each elevator circuit is connected to the energy storage battery via an independent switch. The circuit control switches can be configured individually on the positive, negative, or both sides to achieve independent on / off control between each elevator circuit and the energy storage battery. In this embodiment, by controlling all elevator circuit corresponding control switches to the off state, the multi-elevator circuit is completely isolated from the energy storage battery, and the DC bus voltage of the current elevator energy recovery system is detected to obtain the DC bus voltage of the multi-elevator circuit. In another embodiment, the DC bus voltage of the elevator energy recovery system under different operating conditions is measured through manual exploration, and its fluctuation range is recorded to obtain the DC bus voltage of the multi-elevator circuit.

[0068] Understandably, when an elevator malfunctions—specifically, when its DC bus voltage exceeds a preset range—it's considered a localized circuit anomaly. By disconnecting the corresponding control switch in the multi-elevator circuit control circuit, the connection between that elevator circuit and the energy storage battery is severed, ensuring the remaining elevator circuits continue operating normally. Similarly, if the energy storage battery voltage exceeds a safe range or the current consistently exceeds a safe threshold, it's considered an energy storage battery anomaly. By disconnecting all control switches in the multi-elevator circuit control circuit, the connection between the energy storage battery and all elevators is severed, preventing the battery anomaly from affecting elevator operation. By disconnecting the circuit switch of a single elevator, only the abnormal circuit is isolated, while the remaining elevators continue operating normally, preventing a localized fault from causing a global shutdown. When the energy storage battery malfunctions, all elevator circuits can be quickly disconnected, preventing the battery failure from affecting the elevator's power supply and ensuring elevator operational safety.

[0069] In one feasible implementation, the electrical parameters include DC bus voltage and loop current. The step of calculating the target resistance values ​​corresponding to the charging and discharging conditions based on the electrical parameters of the multiple elevator circuits, the charging safety threshold, and the discharging safety threshold includes:

[0070] Based on the DC bus voltage and the voltage of the energy storage battery, determine the charging and discharging operating voltages of the elevator energy recovery system.

[0071] Based on the charging operating voltage, the discharging operating voltage, the charging safety threshold, and the discharging safety threshold, the total resistance of the charging circuit and the total resistance of the discharging circuit are calculated.

[0072] Obtain the inherent internal resistance of the elevator energy recovery system, calculate the difference between the total resistance of the charging circuit and the total resistance of the discharging circuit and the inherent internal resistance, and obtain the target resistance values ​​corresponding to the charging and discharging conditions, respectively.

[0073] It should be noted that the DC bus voltage refers to the voltage value of the main DC power supply line used for transmitting electrical energy in the multi-elevator circuit. The loop current refers to the magnitude of the current flowing through the multi-elevator circuit; the direction and value of the loop current directly reflect the direction and intensity of electrical energy transmission, used to determine the elevator's operating condition. The charging operating voltage refers to the effective voltage at which driving electrical energy flows from the elevator circuit to the energy storage battery under charging conditions, determined by the difference between the DC bus voltage and the energy storage battery voltage. The discharging operating voltage refers to the effective voltage at which driving electrical energy flows from the energy storage battery to the elevator circuit under discharging conditions, determined by the difference between the energy storage battery voltage and the DC bus voltage. The total resistance of the charging circuit is the total resistance value required for the entire charging circuit to limit the charging current within the charging safety threshold under charging conditions. The charging circuit includes the multi-elevator circuit, the adjustable resistor network, and the internal resistance of the energy storage battery. The total resistance of the discharging circuit is the total resistance value required for the entire discharging circuit to limit the discharging current within the discharging safety threshold under discharging conditions. The inherent internal resistance refers to the total resistance inherent in the elevator energy recovery system. The target resistance value refers to the resistance value that the adjustable resistor network needs to provide for precise current limiting.

[0074] Understandably, the energy transfer direction is opposite during charging and discharging, which leads to different calculation logic for the driving voltage and different requirements for the total circuit resistance. Precise calculations must be performed step by step to ensure the current limiting effect.

[0075] For example, real-time acquisition of the operating parameters of the energy storage battery and the electrical parameters of multiple elevator circuits reveals that the current voltage of the energy storage battery is 72V, the DC bus voltage range is 58V to 78V, and the circuit current fluctuates dynamically. The calculated charging safety threshold for the energy storage battery is 15A, and the discharging safety threshold is 18A. The inherent internal resistance of the elevator energy recovery system is 0.3Ω under charging conditions and 0.25Ω under discharging conditions. First, the charging and discharging operating voltages are determined. During charging, electrical energy flows from the elevator circuit into the energy storage battery, driven by the voltage difference between the elevator circuit voltage and the energy storage battery voltage. Therefore, the maximum value of the DC bus voltage is used to calculate the charging operating voltage as 6V. During discharging, electrical energy flows from the battery into the elevator circuit, and the battery voltage is higher than the elevator circuit voltage. Therefore, the minimum DC bus voltage is used to calculate the discharging operating voltage as 14V. The total resistance of the charging circuit and the total resistance of the discharging circuit are calculated according to Ohm's law, yielding a total charging circuit resistance of 0.4Ω and a total discharging circuit resistance of 0.778Ω. The inherent internal resistance of the elevator energy recovery system is a fixed resistance in the circuit. The adjustable resistor network only needs to provide the additional required resistance to meet the target resistance value requirement. Therefore, the target resistance value under charging conditions is 0.1Ω, and the target resistance value under discharging conditions is 0.528Ω.

[0076] In one feasible implementation, the step of obtaining the inherent internal resistance of the elevator energy recovery system includes:

[0077] All switches in the charging current limiting branch and the discharging current limiting branch of the adjustable resistor network are closed, so that the equivalent resistance of the adjustable resistor network is zero.

[0078] The peak charging current and peak discharging current flowing through the multiple elevator circuits are detected under the charging condition and the discharging condition, respectively.

[0079] The inherent resistance of the elevator energy recovery system under charging and discharging conditions is calculated by comparing the charging operating voltage and the discharging operating voltage with the peak charging current and the peak discharging current, respectively.

[0080] See Figure 4 , Figure 4 This is a schematic diagram of the circuit structure of the adjustable resistor network provided in the first embodiment of this application. The circuit includes two independent charging current-limiting branches and a discharging current-limiting branch. Each branch consists of a unidirectional conducting diode, a multi-stage series resistor unit, and a controllable switch array connected in parallel with the resistor unit. The unidirectional conducting diode is used to distinguish between charging and discharging conditions, achieving electrical isolation between the charging and discharging circuits. Each stage of the multi-stage series resistor unit is a resistor, and by combining different numbers of resistors in series, a wider resistance range can be covered. Each switch in the controllable switch array is connected in parallel with a single-stage resistor unit, and the switching on and off controls whether the corresponding resistor unit is short-circuited.

[0081] It should be noted that the inherent internal resistance affects the accuracy of the target resistance value calculation. In practical applications, ignoring the inherent internal resistance will lead to a deviation between the resistance value provided by the adjustable resistor network and the actual requirement, causing the charging and discharging current to exceed the safety threshold. Using a fixed resistance value will introduce errors due to factors such as elevator model, line loss, and battery aging. By setting the equivalent resistance of the adjustable resistor network to zero, its interference with the loop resistance is eliminated. Then, charging and discharging conditions are simulated separately, and the peak current flowing through the loop is detected. Combined with the charging and discharging operating voltage, the inherent internal resistance of the system is obtained by reverse calculation using Ohm's law. Switch closure means that all controllable switches in the charging and discharging current-limiting branches of the adjustable resistor network are in the conducting state, short-circuiting the resistor branches. Equivalent resistance of zero means that all resistor branches in the adjustable resistor network are short-circuited, and the adjustable resistor network no longer generates additional resistance, only exhibiting the inherent resistance of the wires. The peak charging current refers to the maximum current value flowing through multiple elevator loops under charging conditions. The peak discharging current refers to the maximum current value flowing through multiple elevator loops under discharging conditions. The charging operating voltage refers to the effective voltage difference between the driving electrical energy flowing from the multi-elevator circuit to the energy storage battery under charging conditions. The discharging operating voltage refers to the effective voltage difference between the driving electrical energy flowing from the energy storage battery to the multi-elevator circuit.

[0082] Understandably, by turning on all the controllable switches in the charging and discharging current-limiting branches of the adjustable resistor network, the resistor units in each branch are short-circuited, and the adjustable resistor network no longer generates additional current-limiting resistors, resulting in an equivalent resistance of zero. When the elevator enters the power generation state, the charging circuit flowing through multiple elevator loops is detected, and the maximum value is recorded as the peak charging current. When the elevator enters the motoring state, the discharging current flowing through multiple elevator loops is detected, and the maximum value is recorded as the peak discharging current. According to Ohm's law, the inherent internal resistance of the elevator energy recovery system under charging conditions is obtained by dividing the charging operating voltage by the peak charging current, and the inherent internal resistance under discharging conditions is obtained by dividing the discharging operating voltage by the peak discharging current. By inversely calculating the inherent internal resistance using the operating voltage and current peaks, the calculation results are accurate and real-time. Calculating the inherent internal resistance under different operating conditions further adapts to the differences in loop characteristics under charging and discharging conditions, avoiding errors caused by adapting a single internal resistance value to two operating conditions, and ensuring that dynamic resistance adjustment can stabilize the current within the safe threshold of the energy storage battery.

[0083] Step S30: Control the switching state of the switch array in the adjustable resistor network, and adjust the equivalent resistance of the charging current limiting branch and the discharging current limiting branch to the corresponding target resistance values ​​to regulate the total current flowing through the energy storage battery.

[0084] It should be noted that the target resistance value is a core parameter used to adapt to charging and discharging conditions, ensuring that the current remains stable within a safe threshold under different conditions. Existing technologies use fixed resistors or a single current-limiting loop, which cannot flexibly adjust the resistance value and cannot meet differentiated requirements under different operating conditions, resulting in insufficient current-limiting accuracy. By switching the switch arrays in the independent charging and discharging current-limiting branches of the adjustable resistor network, the number of resistor units connected to each branch is changed, thereby adjusting the equivalent resistance of the branch. The two branches do not interfere with each other and are matched to the target resistance values ​​for charging and discharging conditions respectively, achieving precise control of the charging and discharging current. The switch array refers to the control set composed of all controllable switches in the charging and discharging current-limiting branches, with each controllable switch corresponding to an independent resistor unit branch. The switch state refers to the on or off state of each controllable switch in the switch array.

[0085] Understandably, based on the target resistance values ​​corresponding to the charging and discharging conditions, targeted on / off commands are sent to the switch array to control the on or off state of each controllable switch in the charging current limiting branch and the discharging current limiting branch, so that the equivalent resistance of the two branches accurately matches the corresponding target resistance values, ensuring that the charging current and discharging current are stable within the safe threshold.

[0086] For example, the target charging resistance is 0.5Ω, and the target discharging resistance is 0.8Ω. The adjustable resistor network's charging current-limiting branch includes three resistor unit branches of 0.2Ω, 0.3Ω, and 0.5Ω, each equipped with a controllable switch. The discharging current-limiting branch includes three resistor unit branches of 0.3Ω, 0.5Ω, and 1.0Ω, each equipped with a controllable switch. The charging current-limiting branch turns on the switch corresponding to 0.2Ω + 0.3Ω, which is equivalent to 0.12Ω in parallel, or equivalent to 0.5Ω in series. The discharging current-limiting branch turns on the switch corresponding to 0.3Ω + 0.5Ω, which is equivalent to 0.8Ω in series. In the charging current-limiting branch, the switches corresponding to 0.2Ω and 0.3Ω are turned on, while the others are turned off. In the discharging current-limiting branch, the switches corresponding to 0.3Ω and 0.5Ω are turned on, while the others are turned off. During subsequent charging, the 0.5Ω equivalent resistance of the charging branch limits the current within a safe threshold, while the 0.8Ω equivalent resistance of the discharging branch ensures stable discharge current during discharging, achieving precise current limiting under dual operating conditions.

[0087] In one feasible implementation, the step of controlling the switching state of the switch array in the adjustable resistor network and adjusting the equivalent resistances of the charging current-limiting branch and the discharging current-limiting branch to their respective target resistance values ​​includes:

[0088] Based on the target resistance values ​​corresponding to the charging and discharging conditions, the resistance branches connected to the charging current limiting branch and the discharging current limiting branch are determined respectively.

[0089] By controlling the on / off state of the controllable switches of each resistor branch, the determined resistor branches are respectively connected to the charging current limiting branch and the discharging current limiting branch.

[0090] It should be noted that the adjustable resistor network also includes multiple resistor branches connected in parallel with controllable switches. A resistor branch refers to the basic unit in the adjustable resistor network that constitutes the current-limiting branch. A controllable switch refers to a switching assembly connected in parallel with each resistor branch. A switch array refers to a collection of all controllable switches in the charging current-limiting branch and the discharging current-limiting branch.

[0091] Understandably, the process involves extracting the target resistance values ​​for both the charging and discharging modes, and then querying the combined resistance mapping tables for the charging and discharging current-limiting branches. These tables record the total resistance values ​​for different combinations of resistance branches. The system then filters out resistance branch combinations that enable both the charging and discharging current-limiting branches to reach their target resistance values, thus clarifying the specific resistance branches that need to be connected to each current-limiting branch. This precise matching of target resistance values ​​and resistance branches avoids blindly connecting resistance branches, ensuring that the connected branch combinations directly match the target resistance values. Furthermore, separate filtering for each of the two current-limiting branches ensures independent adaptation logic for both modes. By sending on / off commands to the switch array, the system controls the corresponding controllable switches of the identified resistance branches in the charging current-limiting branch to conduct, connecting these resistance branches to the charging current-limiting branch. Similarly, for the identified resistance branches in the discharging current-limiting branch, the system controls the corresponding controllable switches to conduct, connecting these resistance branches to the discharging current-limiting branch. Unselected resistor branches have their corresponding controllable switches kept open and not connected to the circuit. Ultimately, the equivalent resistances of the two current-limiting branches reach their respective target resistance values. By controlling the on / off state of the controllable switches, flexible connection of resistor branches is achieved, overcoming the limitation of fixed resistor current limiting which cannot be dynamically adjusted. The parallel combination of multiple resistor branches within the same current-limiting branch can cover a wider resistance range, adapting to different target resistance values ​​and improving system adaptability. Simultaneously, the switching controls of the two branches do not interfere with each other, ensuring that the current-limiting actions during charging and discharging are executed independently, avoiding current-limiting deviations caused by overlapping operating conditions, and further ensuring that the charging and discharging current remains stable within the safe threshold.

[0092] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 5 , Figure 5 This is a flowchart illustrating the second embodiment of the battery protection method based on dynamic resistance adjustment according to this application. After step S30, the battery protection method based on dynamic resistance adjustment further includes steps S40-S50:

[0093] Step S40: Determine the energy flow direction of each elevator based on the electrical parameters of the multiple elevator circuits and the operating parameters of the energy storage battery;

[0094] Step S50: Based on the energy flow direction of each elevator, dynamically adjust the equivalent resistance of the adjustable resistor network.

[0095] It should be noted that the operation of multiple elevators is random and cumulative. During morning and evening peak hours, multiple elevators may charge or discharge simultaneously, easily exceeding the safety threshold of the energy storage battery. During off-peak hours, some elevators charge while others discharge, and fixed resistance can lead to excessive energy loss. Therefore, dynamic resistance adjustment based on the energy flow direction of multiple elevators is necessary to adapt to the complex operating conditions and balance battery safety and energy recovery efficiency. The energy flow direction of each elevator is accurately determined by analyzing the electrical parameters of the multiple elevators and the real-time operating parameters of the energy storage battery. The operating conditions are then determined based on the energy flow distribution of all elevators. The target resistance value is dynamically adjusted for different operating conditions, strengthening current limiting when energy flows in the same direction and reducing losses when energy flows in opposite directions. Energy flow direction refers to the direction of electrical energy transmission; in charging mode, the elevator's energy flows to the energy storage battery, and in discharging mode, the energy storage battery's energy flows to the elevator.

[0096] Understandably, this involves real-time acquisition of the loop current, DC bus voltage, and battery terminal voltage and state of charge (SOC) for each elevator. The direction of the loop current directly determines the energy flow direction: current pointing towards the battery indicates charging, while current moving away indicates discharging. Combining battery terminal voltage changes and SOC fluctuations (voltage increases during charging and decreases during discharging, and SOC fluctuations increase during charging and decrease during discharging), the energy flow direction for each elevator is determined. By summarizing the energy flow directions of all elevators, the overall elevator operating conditions are determined, and then the target resistance value is adjusted based on the operating condition. This is achieved by controlling the switching array of the adjustable resistor network to adjust the equivalent resistance of the charging or discharging current-limiting branch to the new target resistance value, thus realizing dynamic current limiting adapted to the operating conditions. This allows the current-limiting parameters to dynamically adapt to the energy flow direction. When current flows in the same direction, protection is strengthened to prevent total current exceeding limits; when current flows in opposite directions, losses are reduced and efficiency is improved, further enhancing the adaptability of the adjustable resistor network.

[0097] In one feasible implementation, the step of dynamically adjusting the equivalent resistance of the adjustable resistor network based on the energy flow direction of each elevator includes:

[0098] When the energy flow of each elevator is superimposed in the same direction and flows to the energy storage battery, the target resistance value is increased, and the equivalent resistance of the adjustable resistor network is adjusted according to the increased target resistance value.

[0099] When the energy flow directions of each elevator are opposite and cancel each other out, the target resistance value is reduced, and the equivalent resistance of the adjustable resistor network is adjusted according to the reduced target resistance value.

[0100] It should be noted that "co-directional superposition" means that the energy flow of multiple elevators is consistent, either all charging the energy storage battery or all drawing power from the energy storage battery. "Anti-directional cancellation" means that the energy flow of some elevators is to charge the energy storage battery, while the energy flow of the remaining elevators is to draw power from the energy storage battery.

[0101] Understandably, when the energy flow of all elevators is from the elevator to the energy storage battery, it is considered a unidirectional superposition condition. A preset ratio is increased based on the initial target resistance value to generate a new target resistance value. By controlling the switch array of the charging current-limiting branch, its equivalent resistance is adjusted to the increased target resistance value, suppressing the superimposed total charging current. By increasing the target resistance value, the total current is reduced, preventing battery overheating and lifespan degradation due to overcurrent, thus strengthening battery safety protection under multi-elevator superposition conditions. When some elevators have energy flow from the elevator to the energy storage battery (charging direction), while the rest have energy storage battery to the elevator (discharging direction), it is considered an anisotropic cancellation condition. A preset ratio is decreased based on the initial target resistance value, ensuring the minimum equivalent resistance is not lower than a safety threshold. By controlling the switch array of the corresponding current-limiting branch, the equivalent resistance is adjusted to the decreased target resistance value. When the opposite direction cancels out, the total current is small. The fixed resistance will cause a lot of power loss due to the heating of the resistance. By reducing the target resistance value, the heat loss of the resistance is reduced, and the regenerative power of the charging elevator can be supplied to the discharging elevator more efficiently, thereby improving the energy recovery and utilization efficiency of the elevator.

[0102] For example, in a scenario with six elevators, the target charging resistance is set to 0.5Ω, the charging safety threshold to 15A, and the target discharging resistance to 0.8Ω, with a discharge safety threshold of 18A. All six elevators are in a heavily loaded downward state, with the circuit current all pointing towards the energy storage battery. The battery terminal voltage continuously increases, and the state of charge rises, indicating a synergistic effect. The target charging resistance is increased by 15%, resulting in a new target resistance of 0.575Ω. The switching array of the charging current-limiting branch is controlled to adjust the equivalent resistance to 0.575Ω, reducing the total charging current from the initial 16A to 13.9A, ensuring battery safety. When three elevators are heavily loaded downwards and three are lightly loaded upwards, the battery terminal voltage is stable, and the state of charge fluctuation is less than 1%, indicating an anisotropic effect. The target charging and discharging resistances are decreased by 8%, resulting in a new target charging resistance of 0.46Ω and a new target discharging resistance of 0.736Ω. By controlling the equivalent resistance of the corresponding current-limiting branch, the heat loss of the resistor was reduced from the initial 2.5W to 1.8W, the energy recovery efficiency was improved by 28%, and the total current was stabilized within the safe threshold.

[0103] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the battery protection method based on dynamic resistance adjustment in this application. Any simple modifications based on this technical concept are within the scope of protection of this application.

[0104] This application provides an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the battery protection method based on dynamic resistance adjustment in Embodiment 1 above.

[0105] The following is for reference. Figure 6 The diagram illustrates a structural schematic of an electronic device suitable for implementing embodiments of this application. The electronic devices in these embodiments may include, but are not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 6 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0106] like Figure 6 As shown, the electronic device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the electronic device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. While electronic devices with various systems are shown in the figures, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0107] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0108] The electronic device provided in this application employs the battery protection method based on dynamic resistance adjustment in the above embodiments, which solves the technical problem that traditional solutions cannot accurately control the charging and discharging current of the battery pack, leading to safety risks in the energy storage battery and affecting the stability of system operation. Compared with the prior art, the beneficial effects of the electronic device provided in this application are the same as those of the battery protection method based on dynamic resistance adjustment provided in the above embodiments, and other technical features of this electronic device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0109] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0110] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0111] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the battery protection method based on dynamic resistance adjustment in the above embodiments.

[0112] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0113] The aforementioned computer-readable storage medium may be included in an electronic device or may exist independently without being assembled into an electronic device.

[0114] The aforementioned computer-readable storage medium carries one or more programs. When the aforementioned one or more programs are executed by an electronic device, the electronic device causes the electronic device to: determine the charging safety threshold and discharging safety threshold of the energy storage battery based on the operating parameters of the energy storage battery; calculate the target resistance values ​​corresponding to the charging and discharging conditions respectively based on the electrical parameters of the multi-elevator circuit, the charging safety threshold, and the discharging safety threshold; control the switching state of the switch array in the adjustable resistor network to adjust the equivalent resistance of the charging current-limiting branch and the discharging current-limiting branch to the corresponding target resistance values, thereby regulating the total current flowing through the energy storage battery.

[0115] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0116] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0117] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0118] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned battery protection method based on dynamic resistance adjustment. This solves the technical problem that traditional solutions cannot accurately control the charging and discharging current of the battery pack, leading to safety risks in the energy storage battery and affecting the stability of system operation. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the battery protection method based on dynamic resistance adjustment provided in the above embodiments, and will not be repeated here.

[0119] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the battery protection method based on dynamic resistance adjustment as described above.

[0120] The computer program product provided in this application can solve the technical problem that traditional solutions cannot accurately control the charging and discharging current of the battery pack, leading to safety risks in energy storage batteries and affecting the stability of system operation. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the battery protection method based on dynamic resistance adjustment provided in the above embodiments, and will not be repeated here.

[0121] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A battery protection method based on dynamic resistance adjustment, characterized in that, An elevator energy recovery system is applied, comprising multiple elevator circuits, an energy storage battery, and an adjustable resistor network. The adjustable resistor network includes a charging current-limiting branch and a discharging current-limiting branch. The adjustable resistor network is connected in series between the energy storage battery and the multiple elevator circuits. The battery protection method based on dynamic resistor adjustment includes: Based on the operating parameters of the energy storage battery, the charging safety threshold and the discharging safety threshold of the energy storage battery are determined. Based on the electrical parameters of the multiple elevator circuits, the charging safety threshold, and the discharging safety threshold, calculate the target resistance values ​​corresponding to the charging and discharging conditions, respectively. The switching state of the switch array in the adjustable resistor network is controlled to adjust the equivalent resistance of the charging current limiting branch and the discharging current limiting branch to the corresponding target resistance values, so as to regulate the total current flowing through the energy storage battery.

2. The battery protection method based on dynamic resistance adjustment as described in claim 1, characterized in that, The operating parameters include state of charge and temperature data. The step of determining the charging safety threshold and discharging safety threshold of the energy storage battery based on the operating parameters of the energy storage battery includes: Based on the real-time collected state of charge and temperature data, the charging safety threshold and the discharging safety threshold are obtained by matching from the preset battery safe operating area data table.

3. The battery protection method based on dynamic resistance adjustment as described in claim 1, characterized in that, The electrical parameters include DC bus voltage and loop current. The steps of calculating the target resistance values ​​corresponding to the charging and discharging conditions based on the electrical parameters of the multiple elevator circuits, the charging safety threshold, and the discharging safety threshold include: Based on the DC bus voltage and the voltage of the energy storage battery, determine the charging and discharging operating voltages of the elevator energy recovery system. Based on the charging operating voltage, the discharging operating voltage, the charging safety threshold, and the discharging safety threshold, the total resistance of the charging circuit and the total resistance of the discharging circuit are calculated. Obtain the inherent internal resistance of the elevator energy recovery system, calculate the difference between the total resistance of the charging circuit and the total resistance of the discharging circuit and the inherent internal resistance, and obtain the target resistance values ​​corresponding to the charging and discharging conditions, respectively.

4. The battery protection method based on dynamic resistance adjustment as described in claim 3, characterized in that, The step of obtaining the inherent internal resistance of the elevator energy recovery system includes: All switches in the charging current limiting branch and the discharging current limiting branch of the adjustable resistor network are closed, so that the equivalent resistance of the adjustable resistor network is zero. The peak charging current and peak discharging current flowing through the multiple elevator circuits are detected under the charging condition and the discharging condition, respectively. The inherent resistance of the elevator energy recovery system under charging and discharging conditions is calculated by comparing the charging operating voltage and the discharging operating voltage with the peak charging current and the peak discharging current, respectively.

5. The battery protection method based on dynamic resistance adjustment as described in claim 1, characterized in that, The step of controlling the switching state of the switch array in the adjustable resistor network and adjusting the equivalent resistances of the charging current limiting branch and the discharging current limiting branch to their respective target resistance values ​​includes: Based on the target resistance values ​​corresponding to the charging and discharging conditions, the resistance branches connected to the charging current limiting branch and the discharging current limiting branch are determined respectively. By controlling the on / off state of the controllable switches of each resistor branch, the determined resistor branches are respectively connected to the charging current limiting branch and the discharging current limiting branch.

6. The battery protection method based on dynamic resistance adjustment as described in claim 1, characterized in that, After the steps of controlling the switching state of the switch array in the adjustable resistor network and adjusting the equivalent resistances of the charging current-limiting branch and the discharging current-limiting branch to their respective target resistance values, the method further includes: The energy flow direction of each elevator is determined based on the electrical parameters of the multiple elevator circuits and the operating parameters of the energy storage battery. The equivalent resistance of the adjustable resistor network is dynamically adjusted based on the energy flow direction of each elevator.

7. The battery protection method based on dynamic resistance adjustment as described in claim 6, characterized in that, The step of dynamically adjusting the equivalent resistance of the adjustable resistor network based on the energy flow direction of each elevator includes: When the energy flow of each elevator is superimposed in the same direction and flows to the energy storage battery, the target resistance value is increased, and the equivalent resistance of the adjustable resistor network is adjusted according to the increased target resistance value. When the energy flow directions of each elevator are opposite and cancel each other out, the target resistance value is reduced, and the equivalent resistance of the adjustable resistor network is adjusted according to the reduced target resistance value.

8. An electronic device, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the battery protection method based on dynamic resistance adjustment as described in any one of claims 1 to 7.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the battery protection method based on dynamic resistance adjustment as described in any one of claims 1 to 7.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the battery protection method based on dynamic resistance adjustment as described in any one of claims 1 to 7.

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