A method and system for automatically activating a backup power supply battery of power distribution automation over-discharge

Abstract

The application discloses a kind of power distribution automation backup power battery overdischarge automatic activation method and system, comprising: detecting charger charging voltage V1 and battery terminal voltage V2, whether external charger is normally accessed according to V1 and V2;If external charger is normally accessed, battery charging current I3 and BMS communication data are detected;According to battery charging current I3 and BMS communication data, whether system operation is abnormal is judged;If system operation is abnormal, battery terminal voltage V2 is detected in real time, when V2 is less than the set starting trickle charging threshold value, then control circuit crosses BMS to battery with the set charging current value Constant-current charging is carried out;When V2 rises to the set stop trickle charging constant value or detects that BMS works normally, then trickle charging is cut off, and BMS carries out battery charging management activation process end.The application can solve the recovery after battery completely loses power under various extreme conditions, and does not depend on the work of BMS and other units, greatly reduces actual operation and maintenance workload.

Description

Technical Field

[0001] This invention relates to the field of battery activation, and particularly to a method and system for automatic activation of over-discharged backup power batteries in power distribution automation systems. Background Technology

[0002] When a backup power battery for power distribution automation (using lithium iron phosphate batteries as an example) is completely discharged and left uncharged for an extended period, its voltage may drop to zero. Since traditional lithium iron phosphate battery-based BMS designs draw power from the battery itself, the BMS cannot function properly when the battery voltage is too low. When an external charger is connected, the battery will fail to charge and will require factory repair. This phenomenon frequently occurs in power distribution automation equipment using lithium iron phosphate batteries as backup power, causing significant inconvenience in practical use.

[0003] CN105429243A discloses a lithium battery management system and its protection method. The system has an over-discharge protection function, which implements protection measures to prevent battery over-discharge and other potential safety hazards by monitoring battery voltage and temperature in real time.

[0004] CN118358438A discloses a battery pack over-discharge protection method. The invention uses the vehicle controller as the control body and executes different levels of protection strategies based on the module's minimum voltage and total voltage as over-discharge: when the measured voltage triggers different preset voltage thresholds, it triggers and causes the battery pack to slowly discharge relative to normal operating conditions or discharges within a short period of time before cutting off the power supply.

[0005] CN117118008A provides a method and system for over-discharge protection of lithium-ion battery packs for satellites, including: a satellite status judgment step: acquiring satellite separation signals and Earth shadow period signals, identifying satellite status information based on satellite separation signals and Earth shadow period signals, and setting whether the lithium-ion battery pack can be disconnected based on the satellite status information; and a battery pack status judgment step: acquiring the voltage and discharge current of all lithium-ion battery packs, and setting whether the lithium-ion battery pack can be disconnected based on the discharge status.

[0006] The aforementioned patents all analyze and judge the collected battery status data or load status, and cut off the battery output when the battery is about to over-discharge to avoid over-discharge, rather than solving the problem of automatically activating the battery and restoring normal charging when the external power supply is connected when the battery is severely over-discharged and the system loses power. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a solution for the inability to recharge backup power supplies after over-discharge in power distribution equipment, thereby effectively solving the difficulties and pain points of battery backup power applications after power distribution automation.

[0008] The present invention adopts the following technical solution.

[0009] The first aspect of this invention provides a method for automatic activation of a backup power battery in a power distribution automation system after over-discharge, comprising:

[0010] Detect the charger's charging voltage V1 and the battery's terminal voltage V2, and determine whether the external charger is properly connected based on V1 and V2.

[0011] If the external charger is connected normally, the battery charging current I3 and the battery management system (BMS) communication data are detected. The BMS communication data includes the BMS communication status, the battery voltage collected by the BMS, and the battery current collected by the BMS. The battery management system (BMS) is then used to determine whether its operation is abnormal.

[0012] If the battery management system (BMS) malfunctions, the battery terminal voltage V2 is further determined. When V2 is less than the set threshold for initiating trickle charging, the trickle charging circuit is closed and the battery is charged at a constant current value by the battery management system (BMS) with the set charging current value.

[0013] When V2 rises to the set stop trickle charging value or the battery management system (BMS) is detected to be working normally, the trickle charging circuit is cut off, and the battery management system (BMS) manages battery charging, thus ending the activation process.

[0014] Preferably, the step of determining whether the external charger is properly connected based on V1 and V2 specifically involves:

[0015] When V1>V2, it is determined that an external charger is connected; when V1≤V2, it is determined that no external charger is connected or the charger is faulty.

[0016] Preferably, the step of determining whether the system is operating abnormally based on the battery charging current I3 and BMS communication data specifically involves:

[0017] If the battery charging current I3>0, it means that the battery is charging and the battery management system (BMS) is operating normally.

[0018] If the battery charging current I3 = 0, then determine whether the BMS communication status is normal and whether the battery voltage and current collected by the BMS are the same as the standard battery voltage and current. If the BMS communication status is abnormal or the battery voltage and current collected by the BMS are different from the standard battery voltage and current, it indicates that the battery management system (BMS) is malfunctioning; otherwise, it indicates that the battery management system (BMS) is malfunctioning.

[0019] Preferably, the formula for calculating the initiation trickle charging threshold is:

[0020]

[0021] Among them, U i The threshold for initiating trickle charging; U0 is the battery rated voltage, U0∈[12,60].

[0022] Preferably, the set charging current value is specifically:

[0023]

[0024] Where I is the set charging current value and C is the battery capacity.

[0025] Preferably, the formula for calculating the threshold for stopping trickle charging is:

[0026]

[0027] Among them, U i The threshold for initiating trickle charging; U0 is the battery rated voltage, U0∈[12,60].

[0028] The second aspect of this invention proposes an automatic over-discharge activation system for backup power batteries in power distribution automation using the method described in the first aspect of this invention. During battery charging, the positive terminal of the battery is connected to the positive terminal of the charger, and the negative terminal of the battery is connected to the negative terminal of the charger via a series-connected BMS module. The automatic activation system is connected across the two ends of the BMS module. The system includes a data acquisition module, a charger connection judgment module, a system operation anomaly judgment module, and a trickle charging control module; specifically:

[0029] Acquisition module: used to detect charger charging voltage V1, battery terminal voltage V2 and battery charging current I3;

[0030] Charger connection detection module: Determines whether the external charger is properly connected based on the values ​​of V1 and V2;

[0031] System operation anomaly judgment module: used to detect battery charging current I3 and battery management system (BMS) communication data when the external charger is normal. The BMS communication data includes BMS communication status, battery voltage acquired by BMS, and battery current acquired by BMS; and to determine whether the system operation is abnormal based on battery charging current I3 and BMS communication data.

[0032] Trickle charging control module: When the system malfunctions, if V2 is less than the set threshold for starting trickle charging, the control circuit will charge the battery at a constant current value through the BMS. When V2 rises to the set threshold for stopping trickle charging or the BMS is detected to be working properly, trickle charging will be cut off, and the battery charging management activation process by the BMS will end.

[0033] A third aspect of the invention provides an apparatus comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor performing steps of an automatic over-discharge activation method for a backup power battery in a power distribution automation system as described in the first aspect of the invention.

[0034] A fourth aspect of the invention provides a storage medium storing a computer-readable storage program that, when executed by a processor, uses the steps of the automatic activation method for over-discharge of a backup power battery in a power distribution automation system as described in the first aspect of the invention.

[0035] The beneficial effects of this invention are that, compared with existing technologies, it is specifically designed for the application scenarios of power distribution automation equipment, does not rely on the working state of the BMS, and is adaptable to various extreme situations, including the state of a battery completely depleted after long-term storage. This invention considers the extreme case where the battery self-discharges and completely drains its remaining charge, making it suitable for situations where power distribution networks are widely distributed and the working environment is complex, and such extreme situations are prevalent. This invention can solve the problem of restoring power to the battery after complete power loss under various extreme conditions, without relying on the BMS or other units, greatly reducing the actual maintenance workload. Furthermore, this invention sets different charging current values ​​and start / stop trickle charging thresholds for different batteries, making it versatile. Attached Figure Description

[0036] Figure 1 This is an electrical schematic diagram of the battery during charging in this invention.

[0037] Figure 2 This is a flowchart of the method in this invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0039] like Figure 2 As shown, Embodiment 1 of the present invention proposes a method for automatic activation of a backup power battery in a power distribution automation system after over-discharge, comprising:

[0040] Detect the charger's charging voltage V1 and the battery's terminal voltage V2, and determine whether the external charger is properly connected based on V1 and V2.

[0041] Preferably, the step of determining whether the external charger is properly connected based on V1 and V2 specifically involves:

[0042] When V1>V2, it is determined that an external charger is connected; when V1≤V2, it is determined that no external charger is connected or the charger is faulty.

[0043] If the external charger is connected normally, the battery charging current I3 and the battery management system (BMS) communication data are detected. The BMS communication data includes the BMS communication status, the battery voltage collected by the BMS, and the battery current collected by the BMS. The battery management system (BMS) is then used to determine whether its operation is abnormal.

[0044] Preferably, the step of determining whether the system is operating abnormally based on the battery charging current I3 and BMS communication data specifically involves:

[0045] If the battery charging current I3>0, it means that the battery is charging and the battery management system (BMS) is operating normally.

[0046] If the battery charging current I3 = 0, then determine whether the BMS communication status is normal and whether the battery voltage and current collected by the BMS are the same as the standard battery voltage and current. If the BMS communication status is abnormal or the battery voltage and current collected by the BMS are different from the standard battery voltage and current, it indicates that the battery management system (BMS) is malfunctioning; otherwise, it indicates that the battery management system (BMS) is malfunctioning.

[0047] If the battery management system (BMS) malfunctions, the battery terminal voltage V2 is further determined. When V2 is less than the set threshold for initiating trickle charging, the trickle charging circuit is closed and the battery is charged at a constant current value by the battery management system (BMS) with the set charging current value.

[0048] Preferably, the formula for calculating the initiation trickle charging threshold is:

[0049]

[0050] Among them, U i The threshold for initiating trickle charging; U0 is the battery rated voltage, U0∈[12,60], and its unit is V.

[0051] Preferably, the set charging current value is specifically:

[0052]

[0053] Where I is the set charging current value, and its unit is A; C is the battery capacity, and its unit is Ah.

[0054] When V2 rises to the set stop trickle charging value or the battery management system (BMS) is detected to be working normally, the trickle charging circuit is cut off, and the battery management system (BMS) manages battery charging, thus ending the activation process.

[0055] Preferably, the formula for calculating the threshold for stopping trickle charging is:

[0056]

[0057] Among them, U i The threshold for initiating trickle charging; U0 is the battery rated voltage, U0∈[12,60], and its unit is V.

[0058] Embodiment 2 of the present invention proposes an automatic over-discharge activation system for backup power batteries in power distribution automation using the method described in Embodiment 1 of the present invention, such as... Figure 1 As shown, during battery charging, the positive terminal of the battery is connected to the positive terminal of the charger, and the negative terminal of the battery is connected to the negative terminal of the charger through a series-connected BMS module. The automatic activation system is connected to both ends of the BMS module. The system includes a data acquisition module, a charger connection judgment module, a system operation anomaly judgment module, and a trickle charging control module; specifically:

[0059] Acquisition module: used to detect charger charging voltage V1, battery terminal voltage V2 and battery charging current I3;

[0060] Charger connection detection module: Determines whether the external charger is properly connected based on the values ​​of V1 and V2;

[0061] System operation anomaly judgment module: used to detect battery charging current I3 and battery management system (BMS) communication data when the external charger is normal. The BMS communication data includes BMS communication status, battery voltage acquired by BMS, and battery current acquired by BMS; and to determine whether the system operation is abnormal based on battery charging current I3 and BMS communication data.

[0062] Trickle charging control module: When the system malfunctions, if V2 is less than the set threshold for starting trickle charging, the control circuit will charge the battery at a constant current value through the BMS. When V2 rises to the set threshold for stopping trickle charging or the BMS is detected to be working properly, trickle charging will be cut off, and the battery charging management activation process by the BMS will end.

[0063] Embodiment 3 of the present invention provides an apparatus including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of an automatic activation method for over-discharge of a backup power battery for power distribution automation as described in Embodiment 1 of the present invention.

[0064] Embodiment 4 of the present invention proposes a storage medium storing a computer-readable storage medium, wherein the computer program, when executed by a processor, uses the steps of the automatic activation method for over-discharge of a backup power battery in a power distribution automation system as described in Embodiment 1 of the present invention.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for automatic activation of a backup power battery in a power distribution automation system after over-discharge, characterized in that, include: Detect the charger's charging voltage V1 and the battery's terminal voltage V2, and determine whether the external charger is properly connected based on V1 and V2. If the external charger is connected normally, the battery charging current I3 and the battery management system (BMS) communication data are detected. The BMS communication data includes the BMS communication status, the battery voltage collected by the BMS, and the battery current collected by the BMS. The battery management system (BMS) is then used to determine whether its operation is abnormal. If the battery management system (BMS) malfunctions, the battery terminal voltage V2 is further determined. When V2 is less than the set threshold for initiating trickle charging, the trickle charging circuit is closed and the battery is charged at a constant current value by the battery management system (BMS) with the set charging current value. When V2 rises to the set stop trickle charging value or the battery management system (BMS) is detected to be working normally, the trickle charging circuit is cut off, and the battery management system (BMS) manages battery charging, thus ending the activation process.

2. The method for automatic activation of a backup power battery for power distribution automation after over-discharge according to claim 1, characterized in that: The method for determining whether the external charger is properly connected based on V1 and V2 is as follows: When V1 > V2, it is determined that an external charger is connected. It can be used to determine whether there is no external charger connected or whether the charger is faulty.

3. The method for automatic activation of a backup power battery for power distribution automation under over-discharge as described in claim 1, characterized in that: The specific steps for determining whether the system is operating abnormally based on the battery charging current I3 and BMS communication data are as follows: If the battery charging current I3>0, it means that the battery is charging and the battery management system (BMS) is operating normally. If the battery charging current I3=0, then determine whether the BMS communication status is normal and whether the battery voltage and current collected by the BMS are the same as the standard battery voltage and current. If the BMS communication status is abnormal or the battery voltage and current collected by the BMS are different from the standard battery voltage and current, it indicates that the battery management system (BMS) is malfunctioning; otherwise, it indicates that the battery management system (BMS) is malfunctioning.

4. The method for automatic activation of a backup power battery for power distribution automation under over-discharge as described in claim 1, characterized in that: The formula for calculating the initiation trickle charging threshold is as follows: in, To trigger the trickle charging threshold; This is the battery's rated voltage. .

5. The method for automatic activation of a backup power battery for power distribution automation after over-discharge according to claim 1, characterized in that: The set charging current value is specifically as follows: in, I The set charging current value, C This refers to the battery capacity.

6. The method for automatic activation of a backup power battery for power distribution automation after over-discharge according to claim 1, characterized in that: The formula for calculating the threshold for stopping trickle charging is: in, To trigger the trickle charging threshold; This is the battery's rated voltage. .

7. An automatic over-discharge activation system for a backup power supply battery in a power distribution automation system using the method described in any one of claims 1-6, wherein during battery charging, the positive terminal of the battery is connected to the positive terminal of the charger, and the negative terminal of the battery is connected to the negative terminal of the charger through a series-connected BMS module. The automatic activation system is connected to both ends of the BMS module. The system includes a data acquisition module, a charger connection judgment module, a system operation anomaly judgment module, and a trickle charging control module; characterized in that: Acquisition module: used to detect charger charging voltage V1, battery terminal voltage V2 and battery charging current I3; Charger connection detection module: Determines whether the external charger is properly connected based on the values ​​of V1 and V2; System operation anomaly judgment module: used to detect battery charging current I3 and battery management system (BMS) communication data when the external charger is normal. The BMS communication data includes BMS communication status, battery voltage acquired by BMS, and battery current acquired by BMS; and to determine whether the system operation is abnormal based on battery charging current I3 and BMS communication data. Trickle charging control module: When the system malfunctions, if V2 is less than the set threshold for starting trickle charging, the control circuit will charge the battery at a constant current value through the BMS. When V2 rises to the set threshold for stopping trickle charging or the BMS is detected to be working properly, trickle charging will be cut off, and the battery charging management activation process by the BMS will end.

8. An automatic over-discharge activation device for a backup power supply battery in a power distribution automation system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor performs the steps of an automatic over-discharge activation method for a backup power supply battery in a power distribution automation system as described in any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program that, when executed by a processor, uses the steps of the automatic activation method for over-discharge of a backup power battery in a power distribution automation system as described in any one of claims 1 to 6.

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