Battery monitoring and analysis method, device and system

Abstract

The present disclosure provides a storage battery monitoring and analyzing method, device and system, and relates to the field of power supply monitoring. The method comprises: acquiring voltage monitoring data of a storage battery group and each single battery thereof; judging whether condition one and condition two are met simultaneously according to the voltage monitoring data, wherein the condition one is that the difference between the voltage monitoring value of at least two single batteries and the nominal value of the floating voltage is greater than a preset voltage difference value, and the condition two is that the decline rate of the voltage monitoring value of more than a preset proportion of remaining single batteries relative to the voltage collection value at a data recording preparation moment is within a certain range, wherein the data recording preparation moment is the moment when the voltage monitoring value of the storage battery group is less than a preset voltage; and if the condition one and the condition two are met simultaneously, it is determined that the storage battery group has a single battery replacement event. According to the change rule of the monitoring voltage value, whether there is a single battery replacement event of the storage battery group is automatically and accurately identified, and then the quality of the storage battery is accurately analyzed.

Description

Technical Field

[0001] This disclosure relates to the field of power supply monitoring, and in particular to a method, apparatus and system for monitoring and analyzing batteries. Background Technology

[0002] In information and communication networks, lead-acid battery packs are a crucial component of backup power and the last line of defense for power supply security. Quality issues can lead to network outages and even fire hazards at communication stations. Therefore, ensuring that the quality of lead-acid battery packs at communication stations meets requirements is of paramount importance.

[0003] Lead-acid battery pack operational quality problems generally begin with the gradual deterioration of individual cells. The probability of a single cell in the battery pack suddenly deteriorating is relatively small. Once severe deterioration of a single cell is detected, it will be replaced. The replacement status of individual cells is a good indicator of the battery pack's operational quality. Currently, data on individual cell replacements is mainly collected manually, but the accuracy of this method is difficult to control and is not suitable for quality supervision. Summary of the Invention

[0004] To address the aforementioned issues, embodiments of this disclosure automatically and accurately identify whether a single battery cell replacement event exists based on the monitored voltage value change pattern, thereby accurately analyzing the battery quality.

[0005] This disclosure provides a method for monitoring and analyzing a storage battery, including:

[0006] Acquire voltage monitoring data of the battery pack and its individual cells;

[0007] Based on the voltage monitoring data, determine whether conditions one and two are met simultaneously. Condition one is: the difference between the voltage monitoring value of at least two individual cells and the nominal value of the float charge voltage is greater than the preset voltage difference. Condition two is: the rate of decrease of the voltage monitoring value of the remaining individual cells exceeding the preset proportion relative to the voltage acquisition value at the time of data recording preparation is within a certain range. The time of data recording preparation is the moment when the voltage monitoring value of the battery pack is less than the preset voltage.

[0008] If both conditions 1 and 2 are met, it is determined that a single cell replacement event has occurred in the battery pack.

[0009] In some embodiments, when a single cell replacement event occurs in the battery pack, the number of single cell replacement events is determined to be 1.

[0010] In some embodiments, acquiring voltage monitoring data of the battery pack and its individual cells includes:

[0011] The voltage of the battery pack is monitored in real time. When the voltage of the battery pack meets condition three, the data recording preparation stage is entered. The current time is marked as the data recording preparation time, and the sampling frequency of the voltage of the battery pack and its individual cells is increased. Condition three is: the voltage monitoring value of the battery pack is less than the preset voltage.

[0012] When condition 1 is met, data recording of the voltage of the battery pack and its individual cells begins.

[0013] From the start of data recording until the preset number of data collection cycles, if condition two is met, data recording continues; otherwise, data recording is terminated, and the collection frequency is restored to the initial collection frequency.

[0014] In some embodiments, acquiring voltage monitoring data of the battery pack and its individual cells further includes:

[0015] When condition four or five is met, data recording stops, and the acquisition frequency is restored to the initial acquisition frequency.

[0016] Condition 4 is: the difference between the voltage monitoring value of all individual cells and the nominal value of the float charge voltage is not greater than the preset voltage difference;

[0017] Condition 5 is: after the voltage monitoring value of the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time; or, after the sum of the voltage monitoring values ​​of all individual cells in the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time.

[0018] In some embodiments, the resource attributes of the battery pack in which the individual battery replacement event occurred are obtained, and the resource attributes of the battery pack and the description information of the individual battery replacement event are updated to the historical database.

[0019] In some embodiments, relevant information from historical databases is retrieved to analyze battery quality based on the planned time period and the dimensions to be statistically analyzed.

[0020] In some embodiments, based on the need to analyze the operational quality of battery packs of the same type, capacity, and production year from a brand perspective, the number of individual battery replacement events for each brand of battery packs of the same type, capacity, and production year is summarized from a historical database. The average replacement rate of individual battery replacement events for each brand of battery packs in the production year is calculated. By comparing the average replacement rate of individual battery replacement events for each brand of battery packs in the production year, the operational quality of each brand of battery packs in the production year is analyzed.

[0021] In some embodiments, the battery monitoring device for monitoring the voltage of the battery pack and its individual cells includes a main power module, a backup power module, and a switching control module for controlling the switching between the main power module and the backup power module.

[0022] In some embodiments, if the battery pack is a 48V battery pack, the preset voltage difference range is 0.7 to 2V, the preset ratio range is 70 to 80%, the lower limit of the rate of decrease ranges from 0.3 to 0.4%, and the upper limit of the rate of decrease ranges from 4.4 to 4.5%.

[0023] This disclosure provides some embodiments of a battery monitoring and analysis device, including: a memory; and a processor coupled to the memory, the processor being configured to execute a battery monitoring and analysis method based on instructions stored in the memory.

[0024] Some embodiments of this disclosure provide a non-transitory computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of a battery monitoring and analysis method.

[0025] This disclosure provides some embodiments of a battery monitoring and analysis system, including:

[0026] The battery monitoring device is configured to acquire voltage monitoring data of the battery pack and its individual cells through monitoring.

[0027] The battery analysis device is configured to determine, based on voltage monitoring data, whether conditions one and two are simultaneously met. Condition one is: the difference between the voltage monitoring value of at least two individual cells and the nominal value of the float charge voltage is greater than a preset voltage difference. Condition two is: the rate of decrease of the voltage monitoring value of the remaining individual cells exceeding a preset proportion relative to the voltage acquisition value at the data recording preparation time is within a certain range. The data recording preparation time is the moment when the voltage monitoring value of the battery pack is less than the preset voltage. If conditions one and two are simultaneously met, it is determined that an individual cell replacement event has occurred in the battery pack.

[0028] In some embodiments, the battery analysis device is further configured to determine that the number of individual cell replacement events is 1 when an individual cell replacement event occurs in the battery pack.

[0029] In some embodiments, the battery monitoring device is configured to:

[0030] The voltage of the battery pack is monitored in real time. When the voltage of the battery pack meets condition three, the data recording preparation stage is entered. The current time is marked as the data recording preparation time, and the sampling frequency of the voltage of the battery pack and its individual cells is increased. Condition three is: the voltage monitoring value of the battery pack is less than the preset voltage.

[0031] When condition 1 is met, data recording of the voltage of the battery pack and its individual cells begins.

[0032] From the start of data recording until the preset number of data collection cycles, if condition two is met, data recording continues; otherwise, data recording is terminated, and the collection frequency is restored to the initial collection frequency.

[0033] In some embodiments, the battery monitoring device is further configured to:

[0034] When condition four or five is met, data recording stops, and the acquisition frequency is restored to the initial acquisition frequency.

[0035] Condition 4 is: the difference between the voltage monitoring value of all individual cells and the nominal value of the float charge voltage is not greater than the preset voltage difference;

[0036] Condition 5 is: after the voltage monitoring value of the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time; or, after the sum of the voltage monitoring values ​​of all individual cells in the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time.

[0037] In some embodiments, the battery analysis device is further configured to:

[0038] Obtain the resource attributes of the battery pack where a single battery replacement event has occurred, and update the resource attributes of the battery pack and the description information of the single battery replacement event to the historical database.

[0039] Based on the planned time period and the dimensions to be statistically analyzed, relevant information from historical databases is retrieved to analyze battery quality.

[0040] In some embodiments, the battery monitoring device includes a main power module, a backup power module, and a switching control module for controlling the switching between the main power module and the backup power module. Attached Figure Description

[0041] The accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. This disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings.

[0042] Obviously, the accompanying drawings described below are merely some embodiments of this disclosure. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0043] Figure 1 The diagram illustrates some embodiments of the battery monitoring and analysis methods disclosed herein.

[0044] Figure 2A schematic diagram of a battery monitoring and analysis system according to some embodiments of this disclosure is shown.

[0045] Figure 3A A schematic diagram of a battery monitoring device according to some embodiments of the present disclosure is shown.

[0046] Figure 3B A schematic diagram of the power supply module of a battery monitoring device according to some embodiments of the present disclosure is shown.

[0047] Figure 4 A schematic diagram of the structure of a battery monitoring and analysis device according to some embodiments of the present disclosure is shown. Detailed Implementation

[0048] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0049] Unless otherwise stated, the terms "first," "second," etc., used in this disclosure are used to distinguish different objects and are not used to indicate size or sequence.

[0050] The following describes the technological basis discovered by the inventors through numerous experiments.

[0051] When a battery bank used for communication in a network experiences a single cell quality issue requiring replacement, maintenance personnel or technicians typically disconnect the battery bank from the communication power supply and replace the faulty cell on-site. A single cell replacement event will cause a sudden drop in the monitored voltage of the replaced cell. However, a detached or faulty monitoring line for a single cell can also cause a sudden voltage drop. The key is to accurately distinguish between these two scenarios and automatically identify whether a single cell replacement event has occurred.

[0052] Through multiple tests, it was found that if a single battery is replaced according to the normal maintenance procedure, the monitoring voltage of the replaced battery will drop sharply, while the monitoring voltages of other batteries in the battery pack will show a regular drop due to the disconnection from the communication power supply. However, if the monitoring line of a single battery is disconnected or malfunctions, only the monitoring voltage of that single battery or an adjacent battery will drop sharply, while the monitoring voltages of other batteries in the battery pack will remain normal. This is the technical basis for the present invention's intelligent identification of single battery replacement events in the battery pack.

[0053] Taking a 48V lead-acid battery pack as an example, the nominal float charge voltage of a single cell is 2.23V. The replacement of cell number 23 was simulated during normal maintenance. The real-time voltage monitoring values ​​of each cell were recorded at the moment of replacement and 30 minutes later. The real-time voltage monitoring values ​​of each cell were simulated before and at the moment of disconnection of the monitoring line of cell number 24.

[0054]

[0055]

[0056]

[0057]

[0058] Experimental data revealed that when a single battery cell is replaced, because adjacent cells are connected by a connector, when the cell being replaced is removed, the monitoring lines of the replaced cell and its adjacent cells are simultaneously disconnected. This causes a sharp drop in the monitoring voltage of the replaced cell and its adjacent cells, exceeding 1V. The monitoring voltages of the other cells in the battery pack, however, show a drop of approximately 0.01V after 30 minutes. The data also showed that when a monitoring line of a single battery cell becomes detached, only the cell with the detached monitoring line experiences a sharp voltage drop. The monitoring voltages of the other cells in the battery pack remain normal after 30 minutes, essentially the same as before the detachment.

[0059] The following is an overview of the technical solution based on the aforementioned technical foundation.

[0060] Since battery pack quality deterioration always begins with the deterioration of individual individual cells, and battery packs play a crucial role in communication stations, the deterioration of individual cells can usually be detected and addressed promptly. Therefore, the replacement status of individual cells in online battery packs can be used to assess the online operational quality of battery packs from different brands. This also forms the basis for intelligent monitoring and analysis of the online operational quality of battery packs.

[0061] This invention, based on the observed voltage changes of individual cells after a single-cell replacement event as discovered in the aforementioned experiments, enables a battery monitoring device to monitor the voltage of the battery pack and its individual cells, automatically identifying potential single-cell replacement events and achieving intelligent online monitoring of the battery pack's operational quality. The battery monitoring device automatically collects and records relevant data, and uploads it to a historical database for storage.

[0062] To achieve intelligent analysis of the online operation quality of battery packs, a battery analysis device capable of data aggregation and analysis is established. This device acquires necessary data from other communication power systems and relevant data on potential individual battery replacement events from battery monitoring devices, automatically analyzing battery quality across different brand dimensions.

[0063] like Figure 1 As shown, the battery monitoring and analysis method includes: in step S110, monitoring the voltage of the battery pack and its individual cells; in step S120, analyzing whether a cell replacement event has occurred in the battery pack or the operating quality of the battery pack based on the voltage monitoring data of the battery pack and its individual cells.

[0064] By utilizing the unique voltage variation patterns observed in individual cells during battery pack replacement, and by monitoring whether the voltage values ​​of each cell conform to a pre-defined pattern, the system automatically identifies whether a battery pack cell replacement event has occurred. This solves the challenge of automatically identifying battery pack cell replacements. The system automatically and accurately identifies battery pack cell replacement events, thereby enabling accurate analysis of battery quality.

[0065] Step S110 monitors the voltage of the battery pack and its individual cells, including: real-time monitoring of the battery pack voltage; when the battery pack voltage meets condition three, entering the data recording preparation stage, marking the current time as the data recording preparation time, and increasing the sampling frequency of the battery pack and its individual cells voltage; when condition one is met, starting data recording of the monitored voltage of the battery pack and its individual cells, this data record is called an alarm record; from the start of data recording until the preset number of data acquisition cycles, if condition two is met, data recording continues, otherwise data recording is terminated, and the sampling frequency is restored to the initial sampling frequency.

[0066] Condition three is: the monitored voltage value of the battery pack is less than the preset voltage. If the battery pack is a 48V battery pack, the preset voltage is, for example, 52V.

[0067] Condition 1 is: the difference between the voltage monitoring value and the nominal value of the float charge voltage of at least two individual cells is greater than a preset voltage difference. If the battery pack is a 48V battery pack, the preset voltage difference range is 0.7 to 2V, for example, 0.7V.

[0068] Condition two is: the rate of decrease in voltage monitoring value of remaining individual cells exceeding a preset proportion relative to the voltage acquisition value at the time of data recording preparation is within a certain range. If the battery pack is a 48V battery pack, the preset proportion range is 70-80%, for example, 80%; the lower limit of the rate of decrease range is 0.3-0.4%, for example, 0.4%; and the upper limit of the rate of decrease range is 4.4-4.5%, for example, 4.5%. The rate of voltage decrease can be replaced by the corresponding voltage decrease value; both express the same technical meaning.

[0069] The battery monitoring device 210 has limited data storage capacity. If the monitoring recording frequency is too high, it may affect the normal operation of the monitoring device. When a single-cell battery replacement event occurs, adjacent cells are connected by a connecting strip. When the replaced cell is removed, the monitoring lines of the replaced cell and its neighboring cells are disconnected. This causes a sudden drop in the monitored voltage of the cell where the replacement event occurred and its neighboring cells, while the monitored voltage of other cells in the battery pack decreases slowly. This invention utilizes this pattern to add a judgment strategy for the possible occurrence of single-cell battery pack replacement events. Only when certain conditions are met is the sampling frequency appropriately increased according to a set pattern, avoiding over-sampling that could cause the battery monitoring device to malfunction and solving a practical operational problem.

[0070] Step S110, which monitors the voltage of the battery pack and its individual cells, also includes: when condition four or condition five is met, stopping data recording and restoring the acquisition frequency to the initial acquisition frequency.

[0071] Condition four is: the difference between the voltage monitoring value of all individual cells and the nominal value of the float charge voltage is not greater than the preset voltage difference. If the battery pack is a 48V battery pack, the preset voltage difference range is 0.7 to 2V, for example, 0.7V.

[0072] Condition 5 is: after the voltage monitoring value of the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time; or, after the sum of the voltage monitoring values ​​of all individual cells in the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time.

[0073] If the battery pack is a 48V battery pack, the preset voltage is, for example, 53V. The preset recording time is, for example, 6 hours.

[0074] Step S120 analyzes whether a single-cell replacement event has occurred in the battery pack, including: based on voltage monitoring data, determining whether conditions one and two are simultaneously met. Condition one is: the difference between the voltage monitoring values ​​of at least two individual cells and the nominal float charge voltage is greater than a preset voltage difference. Condition two is: the rate of decrease in the voltage monitoring values ​​of the remaining individual cells exceeding a preset proportion relative to the voltage acquisition value at the data recording preparation time is within a certain range. The data recording preparation time is the moment when the voltage monitoring value of the battery pack is less than the preset voltage. If conditions one and two are simultaneously met, it is determined that a single-cell replacement event has occurred in the battery pack. Furthermore, in the case of a single-cell replacement event, the number of times the single-cell replacement event has occurred is determined to be 1.

[0075] Step S120 analyzes the operational quality of the battery pack, including: retrieving relevant information from the historical database based on the planned observation period and the dimensions to be statistically analyzed, and analyzing the battery quality. The historical database stores the resource attributes of the battery pack and descriptive information about individual battery replacement events, such as the number of individual battery replacement events and the replacement time.

[0076] For example, based on the need to analyze the operational quality of battery packs of the same type, capacity, and production year from a brand perspective, the number of individual battery replacement events for each battery pack of each brand with the same type, capacity, and production year is summarized from historical databases. The average replacement rate of individual battery replacement events for each brand's battery pack in the production year is calculated. By comparing the average replacement rate of individual battery replacement events for each brand's battery pack in the production year, the operational quality of each brand's battery pack in the production year can be analyzed.

[0077] like Figure 2 As shown, the battery monitoring and analysis system includes: a battery monitoring device 210, configured to acquire voltage monitoring data of the battery pack and its individual cells; and a battery analysis device 220, configured to analyze, based on the voltage monitoring data of the battery pack and its individual cells, whether a cell replacement event has occurred in the battery pack or the operational quality of the battery pack. The specific details of each device will be described later.

[0078] like Figure 2 As shown, the battery monitoring and analysis system also includes: a configuration database 230 and a historical database 240.

[0079] The configuration database 230 stores resource data obtained from the power resource system, including the brand, type, model, commissioning date, capacity, and quantity of each battery pack. It also stores configuration information for each battery pack, including standard information and threshold setting information. Standard information includes, for example, the nominal float charge voltage of the battery pack and its individual cells. Threshold setting information includes, for example, the preset voltage, preset voltage difference, preset ratio, preset drop rate, and preset recording time involved in step S110. The battery monitoring device 210 can obtain relevant configuration information of the monitored battery pack from the configuration database 230.

[0080] The historical database 240 stores alarm records and related data of individual battery replacement events automatically identified and uploaded by the battery monitoring device 210, and a list of related data of confirmed individual battery replacement events periodically updated by the battery analysis device 220.

[0081] like Figure 3A As shown, the battery monitoring device 210 includes a data configuration module 210-1 and a data acquisition and processing module 210-2, and may also include a power supply module 210-3.

[0082] The data configuration module 210-1 is configured to acquire configuration information of the monitored battery pack, including standard information and threshold setting information. Standard information includes, for example, the nominal float charge voltage values ​​of the battery pack and its individual cells. Threshold setting information includes, for example, the preset voltage, preset voltage difference, preset ratio, preset drop rate, and preset recording time involved in step S110. The data configuration module 210-1 can, for example, acquire the configuration information of the monitored battery pack from the configuration database 230.

[0083] The data acquisition and processing module 210-2 is configured to execute step S110. The specific content of step S110 is described above and will not be repeated here.

[0084] To ensure that the battery monitoring device 210 maintains normal power supply during maintenance operations involving replacing individual batteries, and considering that battery replacement is generally not performed under abnormal mains power conditions, and that drawing power from individual batteries is strictly prohibited, the power supply module 210-3 of the battery monitoring device 210 is configured in a primary and backup power supply mode. This includes a primary power module, a backup power module, and a switching control module that controls the switching between the primary and backup power modules. Figure 3BAs shown, the battery monitoring device 210 can only function normally if it detects that both power supply modules are receiving power normally; otherwise, an alarm signal is generated. The main power supply module supports a 220V AC power input mode, while the backup power supply module supports a 48V DC power input mode. This main / backup power supply mode ensures that the battery monitoring device 210 can still operate normally even when individual battery cells in the battery pack are being replaced.

[0085] The battery analysis device 220 is used to calculate and confirm whether there are individual battery replacement events in the alarm records, and can also realize the analysis of the online operation quality of the battery pack according to the input conditions.

[0086] The battery analysis device 220 is configured to determine, based on voltage monitoring data, whether conditions one and two are simultaneously met. Condition one is: the difference between the voltage monitoring value of at least two individual cells and the nominal value of the float charge voltage is greater than a preset voltage difference. Condition two is: the rate of decrease of the voltage monitoring value of the remaining individual cells exceeding a preset proportion relative to the voltage acquisition value at the data recording preparation time is within a certain range. The data recording preparation time is the moment when the voltage monitoring value of the battery pack is less than the preset voltage. If conditions one and two are simultaneously met, it is determined that an individual cell replacement event has occurred in the battery pack.

[0087] The battery analysis device 220 is further configured to determine that the number of individual battery replacement events is 1 when an individual battery replacement event occurs in the battery pack. The battery analysis device 220 is also configured to retrieve the resource attributes of the battery pack in which the individual battery replacement event occurred from the configuration database 230, and update the resource attributes of the battery pack and the descriptive information of the individual battery replacement event (number of individual battery replacement events, replacement time, etc.) to the historical database 240.

[0088] The battery analysis device 220 is also configured to retrieve relevant information from the historical database 240 based on the planned time period and the dimensions to be statistically analyzed, in order to analyze the battery quality.

[0089] For example, based on the need to analyze the operational quality of battery packs of the same type, capacity, and production year from a brand perspective, the number of individual battery replacement events for each battery pack of each brand with the same type, capacity, and production year is summarized from historical databases. The average replacement rate of individual battery replacement events for each brand's battery pack in the production year is calculated. By comparing the average replacement rate of individual battery replacement events for each brand's battery pack in the production year, the operational quality of each brand's battery pack in the production year can be analyzed.

[0090] Figure 4 The diagram illustrates the structure of a battery monitoring and analysis device according to some embodiments of this disclosure. Figure 4As shown, the battery monitoring and analysis device 400 of this embodiment includes: a memory 410 and a processor 420 coupled to the memory 410. The processor 420 is configured to execute the battery monitoring and analysis method of any of the foregoing embodiments based on instructions stored in the memory 410.

[0091] The memory 410 may include, for example, system memory, fixed non-volatile storage media, etc. The system memory stores, for example, the operating system, application programs, boot loader, and other programs.

[0092] The processor 420 can be implemented using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistors, or other discrete hardware components.

[0093] Device 400 may also include input / output interfaces 430, network interfaces 440, and storage interfaces 450. These interfaces 430, 440, and 450, as well as the memory 410 and processor 420, can be connected, for example, via a bus 460. The input / output interface 430 provides a connection interface for input / output devices such as displays, mice, keyboards, and touchscreens. The network interface 440 provides a connection interface for various networked devices. The storage interface 450 provides a connection interface for external storage devices such as SD cards and USB flash drives. The bus 460 can use any bus architecture from various bus structures. For example, bus architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MCA) bus, and the Peripheral Component Interconnect (PCI) bus.

[0094] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more non-transitory computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer program code.

[0095] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0096] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0097] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0098] The above description is only a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A method for monitoring and analyzing a storage battery, characterized in that, include: Acquire voltage monitoring data of the battery pack and its individual cells, including: real-time monitoring of the battery pack voltage; when the battery pack voltage meets condition three, enter the data recording preparation stage, mark the current time as the data recording preparation time, and increase the sampling frequency of the battery pack and its individual cells voltage. Condition three is: the monitored voltage value of the battery pack is less than the preset voltage; when condition one is met, start data recording of the voltage of the battery pack and its individual cells voltage; from the start of data recording to the end of the preset number of data collection cycles, if condition two is met, continue data recording; otherwise, terminate data recording, and at the same time, restore the sampling frequency to the initial sampling frequency. Based on the voltage monitoring data, determine whether conditions one and two are met simultaneously. Condition one is: the difference between the voltage monitoring value of at least two individual cells and the nominal value of the float charge voltage is greater than the preset voltage difference. Condition two is: the rate of decrease of the voltage monitoring value of the remaining individual cells exceeding the preset proportion relative to the voltage acquisition value at the time of data recording preparation is within the preset rate of decrease. The time of data recording preparation is the time when the voltage monitoring value of the battery pack is less than the preset voltage. If both conditions 1 and 2 are met, it is determined that a single cell replacement event has occurred in the battery pack.

2. The method according to claim 1, characterized in that, In the event of a single cell replacement event in the battery pack, the number of times the single cell replacement event occurs is determined to be 1.

3. The method according to claim 1, characterized in that, Acquiring voltage monitoring data for the battery pack and its individual cells also includes: When condition four or five is met, data recording stops, and the acquisition frequency is restored to the initial acquisition frequency. Condition 4 is: the difference between the voltage monitoring value of all individual cells and the nominal value of the float charge voltage is not greater than the preset voltage difference; Condition 5 is: after the voltage monitoring value of the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time; or, after the sum of the voltage monitoring values ​​of all individual cells in the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time.

4. The method according to claim 1, characterized in that, Obtain the resource attributes of the battery pack where a single battery replacement event occurred, and update the resource attributes of the battery pack and the description information of the single battery replacement event to the historical database.

5. The method according to claim 4, characterized in that, Based on the planned time period and the dimensions to be statistically analyzed, relevant information from historical databases is retrieved to analyze battery quality.

6. The method according to claim 5, characterized in that, Based on the need to analyze the operational quality of battery packs of the same type, capacity, and production year from a brand perspective, this study summarizes the number of individual battery replacement events for each brand of battery packs of the same type, capacity, and production year from historical databases. The average replacement rate of individual battery replacement events for each brand of battery packs in the production year is calculated. By comparing the average replacement rate of individual battery replacement events for each brand of battery packs in the production year, the operational quality of each brand of battery packs in the production year is analyzed.

7. The method according to claim 1, characterized in that, The battery monitoring device used to monitor the voltage of the battery pack and its individual cells is equipped with a main power module, a backup power module, and a switching control module that controls the switching between the main power module and the backup power module.

8. The method according to claim 1, characterized in that, If the battery pack is a 48V battery pack, the preset voltage difference range is 0.7~2V, the preset ratio range is 70~80%, the lower limit of the rate of decrease range is 0.3~0.4%, and the upper limit of the rate of decrease range is 4.4-4.5%.

9. A battery monitoring and analysis device, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the battery monitoring and analysis method of any one of claims 1-8 based on instructions stored in the memory.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the battery monitoring and analysis method according to any one of claims 1-8.

11. A battery monitoring and analysis system, comprising: The battery monitoring device is configured to acquire voltage monitoring data of the battery pack and its individual cells through monitoring, including: real-time monitoring of the battery pack voltage; when the battery pack voltage meets condition three, entering the data recording preparation stage, marking the current time as the data recording preparation time, and increasing the sampling frequency of the battery pack and its individual cells voltage, wherein condition three is: the monitored voltage value of the battery pack is less than a preset voltage; when condition one is met, data recording of the voltage of the battery pack and its individual cells begins; from the start of data recording until the end of a preset number of data acquisition cycles, if condition two is met, data recording continues; otherwise, data recording is terminated, and the sampling frequency is restored to the initial sampling frequency. The battery analysis device is configured to determine, based on voltage monitoring data, whether conditions one and two are simultaneously met. Condition one is: the difference between the voltage monitoring value of at least two individual cells and the nominal value of the float charge voltage is greater than a preset voltage difference. Condition two is: the rate of decrease of the voltage monitoring value of the remaining individual cells exceeding a preset proportion relative to the voltage acquisition value at the data recording preparation time is within a preset rate of decrease. The data recording preparation time is the moment when the voltage monitoring value of the battery pack is less than the preset voltage. If conditions one and two are simultaneously met, it is determined that an individual cell replacement event has occurred in the battery pack.

12. The system according to claim 11, characterized in that, The battery analysis device is also configured to determine the number of times a single cell replacement event has occurred as 1 in the event of a single cell replacement event occurring in the battery pack.

13. The system according to claim 11, characterized in that, The battery monitoring device is also configured as follows: When condition four or five is met, data recording stops, and the acquisition frequency is restored to the initial acquisition frequency. Condition 4 is: the difference between the voltage monitoring value of all individual cells and the nominal value of the float charge voltage is not greater than the preset voltage difference; Condition 5 is: after the voltage monitoring value of the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time; Alternatively, if the sum of the monitored voltage values ​​of all individual cells in the battery pack is not less than the preset voltage, the recording time exceeds the preset recording time.

14. The system according to claim 11, characterized in that, The battery analysis device is also configured as follows: Obtain the resource attributes of the battery pack where a single battery replacement event has occurred, and update the resource attributes of the battery pack and the description information of the single battery replacement event to the historical database. Based on the planned time period and the dimensions to be statistically analyzed, relevant information from historical databases is retrieved to analyze battery quality.

15. The system according to claim 11, characterized in that, The battery monitoring device is equipped with a main power module, a backup power module, and a switching control module that controls the switching between the main power module and the backup power module.

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