Lithium battery pack automatic recovery method and system for UPS standby power scene

Abstract

The invention discloses a lithium battery pack automatic recovery method for a UPS standby power scene, and relates to the technical field of UPS matched batteries, and the method comprises the steps: judging whether the discharge of a lithium battery pack is finished or not; if yes, controlling the uninterruptible power supply management system to enter a protection state; when the uninterruptible power supply management system is in a protection state, the protection switch is controlled to carry out short-time pulse conduction at a fixed time interval; after the pulse is conducted, if the uninterruptible power supply management system is in a commercial power state, the uninterruptible power supply management system detects the lithium battery pack and enters a charging mode; and if the uninterruptible power supply management system is in a mains supply-free state, the protection switch is turned off after the pulse is ended, and the lithium battery pack is kept in a protection state until the pulse conduction is performed again at the next time interval. The problem of charging interruption caused by a protection mechanism after deep discharging is solved, and the method has the advantages that manual intervention is not needed, the system reliability is improved, the operation and maintenance efficiency is optimized, existing UPS equipment is compatible, and the technical application threshold is lowered.

Description

Technical Field

[0001] This invention relates to the field of UPS supporting battery technology, specifically to an automatic recovery method and system for lithium battery packs used in UPS backup power scenarios. Background Technology

[0002] Uninterruptible power supply (UPS) systems play a crucial role in ensuring power supply in data centers, industrial control systems, and critical infrastructure. Traditional UPS equipment is designed primarily around the characteristics of lead-acid batteries, and its operating principle requires the detection of a stable DC voltage signal at the battery terminals during the mains power restoration phase to trigger the activation of the charging circuit.

[0003] However, lithium battery packs are highly susceptible to triggering the over-discharge protection mechanism of the uninterruptible power supply (UPS) management system during deep discharge, causing the protection switch to completely cut off the output circuit, preventing the UPS port from collecting any effective voltage. In this state, even if the mains power is restored, the UPS controller will remain in standby mode due to the inability to detect the battery, preventing it from entering the charging process. Existing solutions often rely on manual on-site operation to reset the protection switch or require a dedicated communication protocol between the UPS and the UPS management system for status interaction. Manual intervention not only prolongs system recovery time but also increases maintenance costs, especially in unattended or remotely deployed scenarios. Communication protocol solutions require upgrading existing UPS hardware, leading to significant compatibility issues and significantly raising the technical threshold and application complexity of replacing lead-acid batteries with lithium batteries. These problems severely restrict the large-scale adoption of lithium batteries in UPS backup power, hindering industry trends towards improved energy efficiency and lightweight equipment. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automatic recovery method and system for lithium battery packs in UPS backup power scenarios.

[0005] The objective of this invention is achieved through the following technical solution: In a first aspect, this application discloses an automatic recovery method for lithium battery packs in UPS backup power scenarios, including: Determine whether the lithium battery pack has finished discharging; If so, control the uninterruptible power supply management system to enter protection mode; When the uninterruptible power supply management system is in protection mode, the protection switch is controlled to conduct short-time pulses at fixed time intervals. After the pulse is turned on, if the uninterruptible power supply management system is in a state with mains power, the uninterruptible power supply management system will detect the lithium battery pack and enter the charging mode. If the uninterruptible power supply management system is in a state of no mains power, the protection switch will be turned off after the pulse ends, and the lithium battery pack will remain in a protected state until the pulse is turned on again at the next time interval.

[0006] Based on the first aspect, the determination of whether the lithium battery pack has finished discharging includes: Obtain the discharge voltage of the lithium battery pack; If the discharge voltage of the lithium battery pack is less than a preset threshold, the battery pack discharge ends.

[0007] Based on the first aspect, the pulse conduction width is 100 milliseconds to 1 second, and the interval is 10 seconds to 10 minutes.

[0008] Based on the first aspect, the current of the uninterruptible power management system during pulse conduction is limited by a current limiting circuit or a pre-charge resistor.

[0009] Based on the first aspect, if the lithium battery pack detects that the uninterruptible power management system's charging current exceeds a preset threshold within a certain period of time, the uninterruptible power management system enters the charging mode.

[0010] Based on the first aspect, after the lithium battery pack detects the charging current, it will keep the protection switch closed.

[0011] Based on the first aspect, if the uninterruptible power supply management system is not detected to charge the device within a preset number of pulses after the pulse is turned on, the device will automatically enter a delay waiting mode and resume pulse conduction after the delay period ends.

[0012] Secondly, this application discloses an automatic recovery system for lithium battery packs in UPS backup power scenarios, which is used in the aforementioned automatic recovery method for lithium battery packs in UPS backup power scenarios, comprising: Lithium-ion battery packs are used to provide DC power to uninterruptible power supply management systems or other electrical equipment. An uninterruptible power supply management system is used for intelligent monitoring, protection, and management of lithium battery packs. The protective switch is used to connect or disconnect the lithium battery pack from the external circuit according to the instructions of the uninterruptible power supply management system.

[0013] Based on the second aspect, the uninterruptible power supply management system includes: The sampling module is used to collect voltage, current, and temperature data of the lithium battery pack in real time. The protection control module is used to analyze the data collected by the sampling module. If an abnormal situation occurs, it will issue a command to cut off the protection switch. The pulse control module is used to control the protection switch to be turned on briefly at fixed time intervals after the lithium battery pack enters the protection state, so that the uninterruptible power supply management system can detect the presence of the lithium battery pack and enter the charging mode when there is mains power.

[0014] Based on the second aspect, the uninterruptible power supply management system further includes a charging determination module, which is used to keep the protection switch closed after detecting the charging current of the uninterruptible power supply management system.

[0015] The beneficial effects of this invention are: 1) This application implements short-time pulse conduction at fixed time intervals under the protection state of the uninterruptible power supply management system, so that the UPS equipment can automatically detect the status of the lithium battery pack and trigger the charging process when the mains power is restored. This effectively solves the charging interruption problem caused by the protection mechanism after deep discharge. It has the advantages of no manual intervention, improved system reliability, optimized operation and maintenance efficiency, compatibility with existing UPS equipment and reduced technical application threshold. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating an automatic recovery method for lithium battery packs in a UPS backup power scenario, according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the pulse recovery timing according to an embodiment of the present invention. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] See Figure 1-2 This application discloses an automatic recovery method and system for lithium battery packs in UPS backup power scenarios, the method comprising: Determine whether the lithium battery pack has finished discharging; If so, control the uninterruptible power supply management system to enter protection mode; When the uninterruptible power supply management system is in protection mode, the protection switch is controlled to conduct short-time pulses at fixed time intervals. After the pulse is turned on, if the uninterruptible power supply management system is in a state with mains power, the uninterruptible power supply management system will detect the lithium battery pack and enter the charging mode. If the uninterruptible power supply management system is in a state of no mains power, the protection switch will be turned off after the pulse ends, and the lithium battery pack will remain in a protected state until the pulse is turned on again at the next time interval.

[0019] For example, determining whether the lithium battery pack has finished discharging includes: acquiring the discharge voltage of the lithium battery pack; if the discharge voltage of the lithium battery pack is less than a preset threshold, then the battery pack discharge ends. This embodiment can use a voltage sensor for sampling, the purpose of which is to provide dynamic and objective voltage data, avoiding reliance on fixed time or empirical estimation methods; wherein, if the discharge voltage of the lithium battery pack is less than the preset threshold, then the battery pack discharge ends can be understood as determining the discharge end state based on threshold comparison, which can be implemented using a comparator circuit or software algorithm for threshold judgment, the purpose of which is to define a clear condition for the end of discharge, ensuring that the protection mechanism is triggered only when the voltage is below a safe critical point.

[0020] For example, the pulse conduction width is 100 milliseconds to 1 second, and the interval is 10 seconds to 10 minutes. By limiting the width and interval range of the pulse conduction, the uninterruptible power supply (UPS) management system triggers the protection switch to conduct briefly at fixed time intervals in the protected state. During conduction, the lower limit of 100 milliseconds ensures that the UPS can reliably capture the voltage signal of the lithium battery pack, thereby identifying the presence of the battery; the upper limit of 1 second limits the conduction duration to prevent the lithium battery pack from discharging additionally during the pulse, avoiding the risk of over-discharge. At the same time, the lower limit of 10 seconds reduces the frequent operation of the protection switch and reduces mechanical wear; the upper limit of 10 minutes ensures that the system can complete the detection within a reasonable time after the mains power is restored, shortening the recovery delay. Overall, the precise control of the pulse parameters enables the short-term conduction to effectively trigger the UPS detection mechanism while maintaining the battery's safe state, forming an efficient and stable automatic recovery mechanism.

[0021] For example, current limiting circuits or pre-charge resistors are used to limit the current in the uninterruptible power supply (UPS) system during pulse conduction. In this application, when the protection switch performs a short-time pulse conduction operation, the current limiting circuit or pre-charge resistor is activated and intervenes in the current path. When the lithium battery pack is in a low-voltage state and the mains power is restored, the current limiting circuit dynamically adjusts the current output intensity through a real-time feedback mechanism to ensure a smooth transition of the current to a safe range; while the pre-charge resistor, with its fixed resistance value, limits the current peak value within milliseconds, avoiding instantaneous large currents caused by excessive voltage differences. This design precisely focuses on the specific period of pulse conduction, ensuring both the feasibility of mains power status detection and preventing the UPS system from falsely triggering the protection mechanism due to overcurrent, thereby maintaining the continuity of the automatic recovery process.

[0022] For example, if the lithium battery pack detects that the charging current of the uninterruptible power supply (UPS) system exceeds a preset threshold for a given period of time, the UPS system enters charging mode. By monitoring the charging current signal in real time during the protection switch pulse conduction period and rigorously determining whether the current stably exceeds the preset threshold for a given period, the UPS system only triggers entry into charging mode when the current signal meets the time continuity condition. This effectively filters out transient noise interference, ensuring that the system only switches states when the mains power is stably restored and the charging process is reliably established, thus avoiding malfunctions caused by brief current fluctuations during pulse conduction.

[0023] For example, the lithium battery pack keeps the protection switch closed after detecting the charging current.

[0024] For example, if no charging is detected from the uninterruptible power supply (UPS) system within a preset number of pulses after pulse activation, the system automatically enters a delay waiting mode and resumes pulse activation after the delay. Immediately after each pulse activation, the charging status of the UPS system is checked. If the charging mode is not confirmed after a preset number of consecutive checks, the system automatically switches to a delay waiting mode to pause pulse operation. After the delay, the system resumes the pulse activation sequence. This significantly reduces invalid switching actions under no-mains-power conditions while maintaining timely response to mains power restoration, avoiding misjudgments caused by short-term mains power fluctuations, and ensuring reliable triggering of the charging process when mains power is restored.

[0025] This application also discloses an automatic recovery system for lithium battery packs in UPS backup power scenarios, which is used in the aforementioned automatic recovery method for lithium battery packs in UPS backup power scenarios, including: Lithium-ion battery packs are used to provide DC power to uninterruptible power supply management systems or other electrical equipment; they consist of several lithium iron phosphate cells. An uninterruptible power supply (UPS) management system is used for intelligent monitoring, protection, and management of lithium battery packs. A protective switch is used to connect or disconnect the lithium battery pack from external circuits according to instructions from the uninterruptible power supply (UPS) management system. It can use a MOSFET array or a relay, and a pre-charge resistor can be connected in series to limit current.

[0026] For example, the uninterruptible power supply management system includes: The sampling module is used to collect voltage, current and temperature data of the lithium battery pack in real time. The sampling module refers to the hardware unit that acquires the operating status parameters of the lithium battery pack in real time. It can be implemented by using an analog-to-digital converter in conjunction with a voltage sensor, current transformer and thermistor array. Its purpose is to provide the system with continuous and accurate battery status information to ensure that subsequent analysis has a reliable data foundation. The protection control module is used to analyze the data collected by the sampling module. If an abnormal situation occurs, it issues a command to cut off the protection switch. The protection control module can be understood as a decision-making unit that executes the safety strategy. It can be implemented using protection algorithms running in an embedded microcontroller or programmable logic devices. Its purpose is to quickly identify abnormal conditions such as over-discharge based on real-time data and trigger the protection mechanism in time to avoid battery damage. The pulse control module is used to control the protection switch to be turned on briefly at fixed time intervals after the lithium battery pack enters the protection state, so that the uninterruptible power supply management system can detect the presence of the lithium battery pack and enter the charging mode when mains power is available. The pulse control module is specifically a timing control unit that periodically triggers the switch action. It can be implemented by an independent timing circuit or a pulse width modulation module of a microcontroller. Its purpose is to establish a periodic detection window through controllable short-time conduction operation, so that the system can verify the mains power recovery conditions without destroying the protection state.

[0027] Specifically, this application continuously monitors the voltage, current, and temperature parameters of the lithium battery pack through a sampling module, transmitting the data in real time to the protection control module for anomaly detection. When the discharge voltage is detected to be lower than the safety threshold, the protection control module immediately issues a command to cut off the protection switch, putting the lithium battery pack into a protection state. Subsequently, the pulse control module initiates periodic operations according to a preset time interval, controlling the protection switch to conduct for short periods of milliseconds to seconds. During this process, if the mains power has been restored, the UPS port will detect the presence signal of the lithium battery pack, and the uninterruptible power management system will then switch to charging mode. If the mains power has not been restored, the protection switch will automatically turn off after the pulse ends, maintaining the protection state until the next conduction attempt. This forms a complete closed-loop detection process, in which the sampling module provides basic data support, the protection control module ensures safety boundaries, and the pulse control module creates dynamic detection conditions. The three work together to achieve autonomous recovery capability under protection.

[0028] For example, the uninterruptible power supply management system further includes a charging determination module, which is used to keep the protection switch closed after detecting the charging current of the uninterruptible power supply management system. By monitoring the charging current of the uninterruptible power supply management system in real time through the charging determination module, when the presence of charging current is detected under the pulse conduction mechanism, the closing and holding command of the protection switch is immediately triggered. Thus, after confirming that the mains power is restored and the charging process is started, the protection switch no longer automatically closes with the pulse cycle at fixed time intervals, ensuring the continuous conduction of the charging path. This allows the system to smoothly transition from the pulse detection stage to the stable charging stage, eliminating the charging interruption problem caused by repeated pulse conduction.

[0029] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. An automatic recovery method for lithium battery packs in UPS backup power scenarios, characterized in that, include: Determine if the lithium battery pack has finished discharging; If so, control the uninterruptible power supply management system to enter protection mode; When the uninterruptible power supply management system is in protection mode, the protection switch is controlled to conduct short-time pulses at fixed time intervals. After the pulse is turned on, if the uninterruptible power supply management system is in a state with mains power, the uninterruptible power supply management system will detect the lithium battery pack and enter the charging mode. If the uninterruptible power supply management system is in a state of no mains power, the protection switch will be turned off after the pulse ends, and the lithium battery pack will remain in a protected state until the pulse is turned on again at the next time interval.

2. The automatic recovery method for lithium battery packs in UPS backup power scenarios according to claim 1, characterized in that, The determination of whether the lithium battery pack has finished discharging includes: Obtain the discharge voltage of the lithium battery pack; If the discharge voltage of the lithium battery pack is less than a preset threshold, the battery pack discharge ends.

3. The automatic recovery method for lithium battery packs in UPS backup power scenarios according to claim 2, characterized in that: The pulse conduction width is 100 milliseconds to 1 second, and the interval is 10 seconds to 10 minutes.

4. The automatic recovery method for lithium battery packs in UPS backup power scenarios according to claim 2, characterized in that: The pulse conduction width is 100 milliseconds to 1 second, and the interval is 10 seconds to 10 minutes.

5. The automatic recovery method for lithium battery packs in UPS backup power scenarios according to claim 4, characterized in that: If the lithium battery pack detects that the uninterruptible power management system's charging current exceeds a preset threshold for a certain period of time, the uninterruptible power management system will enter charging mode.

6. The automatic recovery method for lithium battery packs in UPS backup power scenarios according to claim 5, characterized in that: After the lithium battery pack detects the charging current, it keeps the protection switch closed.

7. The automatic recovery method for lithium battery packs in UPS backup power scenarios according to claim 6, characterized in that: If the uninterruptible power supply management system fails to charge the device within a preset number of pulses after the pulse is turned on, it will automatically enter a delay waiting mode and resume pulse turn-on after the delay period ends.

8. An automatic recovery system for lithium battery packs in UPS backup power scenarios, used in the automatic recovery method for lithium battery packs in UPS backup power scenarios as described in any one of claims 1-7, characterized in that, include: Lithium-ion battery packs are used to provide DC power to uninterruptible power supply management systems or other electrical equipment. An uninterruptible power supply management system is used for intelligent monitoring, protection, and management of lithium battery packs. The protective switch is used to connect or disconnect the lithium battery pack from the external circuit according to the instructions of the uninterruptible power supply management system.

9. An automatic recovery system for lithium battery packs in UPS backup power scenarios according to claim 8, characterized in that, The uninterruptible power supply management system includes: The sampling module is used to collect voltage, current, and temperature data of the lithium battery pack in real time. The protection control module is used to analyze the data collected by the sampling module. If an abnormal situation occurs, it will issue a command to cut off the protection switch. The pulse control module is used to control the protection switch to be turned on briefly at fixed time intervals after the lithium battery pack enters the protection state, so that the uninterruptible power supply management system can detect the presence of the lithium battery pack and enter the charging mode when there is mains power.

10. An automatic recovery system for lithium battery packs in UPS backup power scenarios according to claim 9, characterized in that: The uninterruptible power supply management system also includes a charging determination module, which is used to keep the protection switch closed after detecting the charging current of the uninterruptible power supply management system.

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