Power distribution automation backup power supply battery over-discharge automatic activation method and system

Abstract

The invention discloses a power distribution automation backup power supply battery overdischarge automatic activation method and system, and the method comprises the steps: detecting the charging voltage V1 and the battery end voltage V2 of a charger, and judging whether an external charger is normally connected or not according to the V1 and the V2; if the external charger is normally connected, detecting a battery charging current I3 and BMS communication data; judging whether system operation is abnormal or not according to the battery charging current I3 and BMS communication data; if the system runs abnormally, the battery end voltage V2 is detected in real time, and when the V2 is smaller than a set starting trickle charging threshold value, the control circuit strides over the BMS to carry out constant-current charging on the battery at a set charging current value; and when V2 rises to a set trickle charging stopping constant value or it is detected that the BMS works normally, trickle charging is cut off, and the BMS finishes the battery charging management activation process. The method can solve the problem of recovery of the battery after complete power loss under various extreme conditions, does not depend on the work of a BMS and other units, and greatly reduces the actual operation and maintenance workload.

Description

Technical Field

[0001] The present invention relates to the field of battery activation, and in particular to a method and system for automatically activating an over-discharged backup power supply battery for power distribution automation. Background Art

[0002] When the backup power battery of distribution automation (here taking lithium iron phosphate battery as an example) is completely discharged and not charged for a long time, the voltage will drop to 0. Since the traditional lithium iron phosphate battery BMS design takes the working power from the battery side, the BMS cannot work normally when the battery terminal voltage is too low. When the external charger is connected, the battery cannot be charged and can only be returned to the factory for repair. The above phenomenon often occurs in distribution automation equipment that uses lithium iron phosphate batteries as backup power, causing great inconvenience in actual use.

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

[0004] CN118358438A discloses a method for over-discharge protection of a battery pack. The invention uses a vehicle controller as the control subject and implements different levels of protection strategies for over-discharge based on the minimum voltage of the module and the total voltage: when the measured voltage triggers different preset voltage thresholds, the battery pack is triggered and causes to discharge slowly relative to normal operating conditions or to discharge in 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: collecting the satellite's rocket separation signal and earth shadow period signal, identifying the satellite status information according to the rocket separation signal and the earth shadow period signal, and setting whether the lithium-ion battery pack is allowed to be disconnected based on the satellite status information; a battery pack status judgment step: collecting the voltage and discharge current of all lithium-ion battery packs, and setting whether the lithium-ion battery pack is allowed to be disconnected based on the discharge situation.

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

[0007] In order to solve the deficiencies in the prior art, the present invention provides a solution for the backup power supply of power distribution equipment that cannot be charged after over-discharge, thereby effectively solving the difficulties and pain points of battery backup power supply application after power distribution automation.

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

[0009] The first aspect of the present invention provides a method for automatically activating an over-discharged backup power supply battery for distribution automation, comprising:

[0010] Detect the charger voltage V1 and the battery terminal voltage V2, and determine whether the external charger is connected normally 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, and the battery management system BMS communication data includes the battery management system BMS communication status, the battery voltage collected by the BMS, and the battery current collected by the BMS; according to the battery charging current I3 and the battery management system BMS communication data, it is judged whether the battery management system BMS is operating abnormally;

[0012] If the battery management system BMS operates abnormally, the battery terminal voltage V2 is further determined. When V2 is less than the set trickle charge start threshold, the trickle charge circuit is controlled to close and the battery is charged with a set constant current value across the battery management system BMS.

[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 performs battery charging management, and the activation process ends.

[0014] Preferably, judging whether the external charger is normally connected according to V1 and V2 is specifically as follows:

[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, judging whether the system operation is abnormal according to the battery charging current I3 and the BMS communication data is specifically as follows:

[0017] If the battery charging current I3>0, it means that the battery is being charged 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 battery current collected by the BMS are the same as the standard battery voltage and battery current of the battery. If the BMS communication status is abnormal or the battery voltage and battery current collected by the BMS are different from the standard battery voltage and battery current of the battery, it means that the battery management system BMS is operating abnormally; otherwise, it means that the battery management system BMS is operating normally.

[0019] Preferably, the calculation formula for starting trickle charging threshold is:

[0020]

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

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

[0023]

[0024] Among them, I is the set charging current value, and C is the battery capacity.

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

[0026]

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

[0028] The second aspect of the present invention proposes an automatic activation system for over-discharge of a backup power supply battery for power distribution automation using the method described in the first aspect of the present invention. When the battery is charged, the positive electrode of the battery is connected to the positive electrode of the charger, and the negative electrode of the battery is connected to the negative electrode of the charger through a BMS module connected in series. The automatic activation system is connected to both ends of the BMS module. The system includes a collection module, a charger access judgment module, a system operation abnormality judgment module, and a trickle charging control module; specifically:

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

[0030] Charger access judgment module: judge whether the external charger is normally connected according to the size of V1 and V2;

[0031] System operation abnormality judgment module: used to detect the battery charging current I3 and the battery management system BMS communication data when the external charger is normal, the battery management system BMS communication data includes the BMS communication status, the battery voltage obtained by the BMS, and the battery current obtained by the BMS; judge whether the system operation is abnormal according to the battery charging current I3 and the BMS communication data;

[0032] Trickle charge control module: When the system is operating abnormally, when V2 is less than the set trickle charge start threshold, the control circuit bypasses the BMS to charge the battery at a set charging current value; when V2 rises to the set stop trickle charge constant value or the BMS is detected to be working normally, the trickle charge is cut off, and the battery charging management activation process by the BMS ends.

[0033] The third aspect of the present invention proposes a device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of a method for automatically activating an over-discharge battery of a distribution automation backup power supply as described in the first aspect of the present invention.

[0034] The fourth aspect of the present invention proposes a storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the method for automatically activating over-discharge of a distribution automation backup power supply battery described in the first aspect of the present invention are used.

[0035] The beneficial effect of the present invention is that, compared with the prior art, the present invention is specifically innovative for the application scenario characteristics of power distribution automation equipment, does not depend on the working state of the BMS, is adaptable to various extreme situations, and the state where the battery is completely out of power after being placed for a long time. The present invention takes into account the extreme situation where the battery self-discharges and completely empties the remaining power, and is applicable to the situation where the power distribution network is widely distributed and the working environment is complex, and such extreme situations exist in large numbers. The present invention can solve the problem of restoring the battery after it is completely out of power in various extreme situations, and does not depend on the work of the BMS and other units, greatly reducing the actual operation and maintenance workload. In addition, the present invention sets different charging current values ​​and start and stop trickle charging thresholds for different batteries, and is versatile. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0037] Figure 2 is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0039] like Figure 2 As shown, Embodiment 1 of the present invention proposes a method for automatically activating an over-discharged backup power supply battery for power distribution automation, comprising:

[0040] Detect the charger voltage V1 and the battery terminal voltage V2, and determine whether the external charger is connected normally based on V1 and V2;

[0041] Preferably, judging whether the external charger is normally connected according to V1 and V2 is specifically as follows:

[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, and the battery management system BMS communication data includes the battery management system BMS communication status, the battery voltage collected by the BMS, and the battery current collected by the BMS; according to the battery charging current I3 and the battery management system BMS communication data, it is judged whether the battery management system BMS is operating abnormally;

[0044] Preferably, judging whether the system operation is abnormal according to the battery charging current I3 and the BMS communication data is specifically as follows:

[0045] If the battery charging current I3>0, it means that the battery is being charged 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 battery current collected by the BMS are the same as the standard battery voltage and battery current of the battery. If the BMS communication status is abnormal or the battery voltage and battery current collected by the BMS are different from the standard battery voltage and battery current of the battery, it means that the battery management system BMS is operating abnormally; otherwise, it means that the battery management system BMS is operating normally.

[0047] If the battery management system BMS operates abnormally, the battery terminal voltage V2 is further determined. When V2 is less than the set trickle charge start threshold, the trickle charge circuit is controlled to close and the battery is charged with a set constant current value across the battery management system BMS.

[0048] Preferably, the calculation formula for starting trickle charging threshold is:

[0049]

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

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

[0052]

[0053] Among them, I is the set charging current value, its unit is A; C is the battery capacity, 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 performs battery charging management, and the activation process ends.

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

[0056]

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

[0058] Embodiment 2 of the present invention proposes a distribution automation backup power supply battery over-discharge automatic activation system using the method described in Embodiment 1 of the present invention, such as Figure 1 As shown, when the battery is charged, the positive electrode of the battery is connected to the positive electrode of the charger, and the negative electrode of the battery is connected to the negative electrode 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 collection module, a charger access judgment module, a system operation abnormality judgment module, and a trickle charging control module; specifically:

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

[0060] Charger access judgment module: judge whether the external charger is normally connected according to the size of V1 and V2;

[0061] System operation abnormality judgment module: used to detect the battery charging current I3 and the battery management system BMS communication data when the external charger is normal, the battery management system BMS communication data includes the BMS communication status, the battery voltage obtained by the BMS, and the battery current obtained by the BMS; judge whether the system operation is abnormal according to the battery charging current I3 and the BMS communication data;

[0062] Trickle charge control module: When the system is operating abnormally, when V2 is less than the set trickle charge start threshold, the control circuit bypasses the BMS to charge the battery at a set charging current value; when V2 rises to the set stop trickle charge constant value or the BMS is detected to be working normally, the trickle charge is cut off, and the battery charging management activation process by the BMS ends.

[0063] Embodiment 3 of the present invention proposes a device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of a method for automatically activating over-discharge of a distribution automation backup power supply battery as described in Embodiment 1 of the present invention.

[0064] Embodiment 4 of the present invention proposes a storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of a method for automatically activating an over-discharged backup power supply battery for distribution automation described in Embodiment 1 of the present invention are used.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for automatically activating over-discharged backup power supply batteries for power distribution automation, characterized in that: include: Detect the charging voltage V1 of the charger and the voltage V2 of the battery terminal, and judge whether the external charger is connected normally according to 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, and the battery management system BMS communication data includes the battery management system BMS communication status, the battery voltage collected by the BMS, and the battery current collected by the BMS; according to the battery charging current I3 and the battery management system BMS communication data, it is judged whether the battery management system BMS is operating abnormally; If the battery management system BMS operates abnormally, the battery terminal voltage V2 is further determined. When V2 is less than the set trickle charge start threshold, the trickle charge circuit is controlled to close and the battery is charged with a set constant current value across the battery management system BMS. 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 performs battery charging management, and the activation process ends.

2. The method for automatically activating the over-discharged backup power supply battery of distribution automation according to claim 1, characterized in that: The method of judging whether the external charger is normally connected according to V1 and V2 is as follows: 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.

3. The method for automatically activating the over-discharged backup power supply battery of distribution automation according to claim 1, characterized in that: The specific method of judging whether the system operation is abnormal based on the battery charging current I3 and the BMS communication data is as follows: If the battery charging current I3>0, it means that the battery is being charged 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 battery current collected by the BMS are the same as the standard battery voltage and battery current of the battery. If the BMS communication status is abnormal or the battery voltage and battery current collected by the BMS are different from the standard battery voltage and battery current of the battery, it means that the battery management system BMS is operating abnormally; otherwise, it means that the battery management system BMS is operating normally.

4. The method for automatically activating the over-discharged backup power supply battery of distribution automation according to claim 1, characterized in that: The calculation formula for starting trickle charge threshold is: Among them, U i is the threshold for starting trickle charging; U0 is the rated voltage of the battery, U0∈[12,60].

5. The method for automatically activating the over-discharged backup power supply battery of distribution automation according to claim 1, characterized in that: The set charging current value is specifically: Among them, I is the set charging current value, and C is the battery capacity.

6. The method for automatically activating over-discharged backup power supply batteries for distribution automation according to claim 1, characterized in that: The calculation formula for stopping trickle charging threshold is: Among them, U i is the threshold for starting trickle charging; U0 is the rated voltage of the battery, U0∈[12,60].

7. A distribution automation backup power battery over-discharge automatic activation system using the method described in claims 1-6, when the battery is charged, the positive electrode of the battery is connected to the positive electrode of the charger, and the negative electrode of the battery is connected to the negative electrode of the charger through a BMS module connected in series, and the automatic activation system is connected to both ends of the BMS module, and the system includes a collection module, a charger access judgment module, a system operation abnormality judgment module, and a trickle charging control module; characterized in that: Acquisition module: used to detect the charger charging voltage V1, battery terminal voltage V2 and battery charging current I3; Charger access judgment module: judge whether the external charger is normally connected according to the size of V1 and V2; System operation abnormality judgment module: used to detect the battery charging current I3 and the battery management system BMS communication data when the external charger is normal, the battery management system BMS communication data includes the BMS communication status, the battery voltage obtained by the BMS, and the battery current obtained by the BMS; judge whether the system operation is abnormal according to the battery charging current I3 and the BMS communication data; Trickle charge control module: When the system is operating abnormally, when V2 is less than the set trickle charge start threshold, the control circuit bypasses the BMS to charge the battery at a set charging current value; when V2 rises to the set stop trickle charge constant value or the BMS is detected to be working normally, the trickle charge is cut off, and the battery charging management activation process by the BMS ends.

8. A device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of a method for automatically activating an over-discharged battery of a distribution automation backup power supply using any one of claims 1 to 6.

9. A storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for automatically activating the over-discharge of the backup power supply battery of distribution automation according to any one of claims 1 to 6 are used.

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