Modular cell switching method, battery management module, battery system and dielectric

Abstract

This application relates to the field of energy storage system technology, specifically providing a modular cell switching method, a battery management module, a battery system, and a dielectric, aiming to solve the problems of cumbersome cell switching steps, long processing times, and high maintenance costs in existing technologies. To this end, the modular cell switching method of this application is applied to a battery system comprising multiple independent cell modules. The method includes: acquiring temperature characteristic data of the cell modules; determining whether the temperature characteristic data of the cell modules meets preset anomaly judgment conditions; if so, performing anomaly verification on the cell modules and identifying problematic cell modules based on the verification results; acquiring the switching priority order of the problematic cell modules; and performing a switching operation on the problematic cell modules based on the switching priority order. This application relies on a modular cell design to achieve fast and convenient cell switching, reducing maintenance costs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage systems, and specifically provides a modularized battery cell switching method, a battery management module, a battery system and a medium. BACKGROUND

[0002] In the fields of electric vehicles, energy storage devices, etc., battery cell switching systems have been widely used. Such systems usually include battery cells, battery management systems (BMS) and related connection and control circuits. However, the battery cell switching systems in the prior art are mostly fixed in design, resulting in a complex replacement and maintenance process of battery cells, which usually requires the operation of professional technicians, and it is difficult for users to complete the replacement by themselves. Moreover, once the battery cells are damaged, the entire battery system needs to be replaced, which is costly. In addition, the traditional method requires the device to be shut down when the battery cells are depleted or need to be replaced, which is easy to cause service interruption or affect user experience. Meanwhile, different models of battery cells have differences in physical size and electrical characteristics, and direct replacement faces problems such as poor compatibility, complex operation and high safety risks.

[0003] Correspondingly, there is a need for a new battery cell switching scheme to solve the above problems. SUMMARY

[0004] In order to overcome the above defects, the present application is proposed to provide a solution or at least partially solve the technical problems of the existing battery cell switching technology, such as complicated replacement steps, long time consumption and high maintenance cost.

[0005] In a first aspect, the present application provides a modularized battery cell switching method, which is applied to a battery system including a plurality of independent battery cell modules. The method includes: obtaining temperature characteristic data of the battery cell modules; determining whether the temperature characteristic data of the battery cell modules meets a preset abnormality determination condition; if yes, performing abnormality checking on the battery cell modules, determining a problem battery cell module based on a checking result; obtaining a switching priority order of the problem battery cell module; and performing a switching operation on the problem battery cell module based on the switching priority order of the problem battery cell module.

[0006] In one technical solution of the above modularized battery cell switching method, the obtaining of the temperature characteristic data of the battery cell modules includes: obtaining temperature information of all the battery cell modules; and determining a maximum temperature value, a minimum temperature value and a temperature change rate of each battery cell module as the temperature characteristic data of the battery cell modules based on the temperature information of all the battery cell modules.

[0007] In one technical solution of the above-mentioned modular battery cell switching method, the step of performing anomaly verification on the battery cell module and determining the problematic battery cell module based on the verification result includes: obtaining the temperature information of all battery cell modules; performing anomaly verification on the battery cell modules using the Grobbs test method based on the temperature information of all battery cell modules to determine the abnormal deviation degree of the battery cell module; determining whether the abnormal deviation degree of the battery cell module is greater than the corresponding preset abnormal threshold value; if so, determining that the temperature information of the battery cell module is an abnormal value and identifying the battery cell module as a problematic battery cell module.

[0008] In one technical solution of the above-mentioned modular cell switching method, obtaining the switching priority order of the problematic cell module includes: obtaining the voltage difference and capacity deviation of the problematic cell module relative to other normal cell modules; determining the optimizable coefficient of the problematic cell module based on the maximum value of the voltage difference and the capacity deviation; and determining the switching priority order of the problematic cell module based on the optimizable coefficient.

[0009] In one technical solution of the above-mentioned modular cell switching method, obtaining the voltage difference and capacity deviation of the problematic cell module relative to other normal cell modules includes: obtaining voltage information and remaining capacity information of all cell modules; determining the average voltage based on the voltage information of all normal cell modules; determining the average remaining capacity based on the remaining capacity information of all normal cell modules; calculating the difference between the voltage of the problematic cell module and the average voltage as the voltage difference; and calculating the difference between the remaining capacity of the problematic cell module and the average remaining capacity as the capacity deviation.

[0010] In one technical solution of the above-mentioned modular cell switching method, the step of performing a switching operation on the problematic cell module based on the switching priority order of the problematic cell module includes: obtaining the current operating state of the battery system; and performing a switching operation on the problematic cell module according to the switching priority order of the problematic cell modules based on the current operating state of the battery system.

[0011] In one technical solution of the above-mentioned modular cell switching method, the current operating state of the battery system includes any one of a charging state, a resting state, and a discharging state; the step of performing a switching operation on the problematic cell module based on the current operating state of the battery system and according to the switching priority order of the problematic cell module includes: when the current operating state of the battery system is a resting state, disconnecting the problematic cell module from the battery system according to the switching priority order of the problematic cell modules, switching to a backup cell module, and issuing a prompt; or, when the current operating state of the battery system is a charging state... According to the switching priority order of the problematic battery cell module, the remaining capacity of the backup battery cell module to be switched in is charged until it matches the remaining capacity of other normal battery cell modules in the battery system. The connection between the problematic battery cell module and the battery system is then disconnected, the backup battery cell module is switched in, and a prompt is issued. Alternatively, if the current operating state of the battery system is in a discharging state, according to the switching priority order of the problematic battery cell module, the remaining capacity of other normal battery cell modules in the battery system is discharged until it matches the remaining capacity of the backup battery cell module to be switched in. The connection between the problematic battery cell module and the battery system is then disconnected, the backup battery cell module is switched in, and a prompt is issued.

[0012] In one technical solution of the above-mentioned modular cell switching method, the battery system includes a temperature control device; the method further includes: if the temperature characteristic data of the cell module does not meet the preset abnormal judgment conditions, then based on the temperature characteristic data of the cell module, controlling the working state of the cell module and / or the temperature control device.

[0013] In one technical solution of the above-mentioned modular cell switching method, controlling the working state of the cell module and / or the temperature control device based on the temperature characteristic data of the cell module includes: controlling the working power and start / stop state of the cell module based on at least one of the maximum temperature, minimum temperature and temperature change rate, and / or controlling the start / stop state of the temperature control device.

[0014] In one technical solution of the above-mentioned modular battery cell switching method, the method further includes: determining the problem type of the problem battery cell module based on the maximum value of the voltage difference and capacity deviation between the problem battery cell module and other normal battery cell modules; uploading the charge / discharge data, problem type, and switching priority order of the problem battery cell module to an experience database, so that the experience database performs the steps of determining the problem battery cell module, determining the problem type of the problem battery cell module, and determining the switching priority order based on the charge / discharge data, problem type, and switching priority order of the problem battery cell module.

[0015] In a second aspect, this application provides a battery management module configured to perform the modular cell switching method described in any of the above-described technical solutions.

[0016] In a third aspect, a battery system is provided, the battery system comprising multiple independent cell modules, a host, a battery management module, and a temperature control device; wherein, the battery management module includes a switching control unit configured to control the insertion and removal operations of the cell modules and the host based on control commands from the battery management module; the cell module includes a cell unit and a standardized interface, wherein the cell module is connected to a pluggable interface of the host through the standardized interface; the cell unit is configured to store energy; the host includes a quick-connect mechanism, the quick-connect mechanism including a pluggable interface and a fixing device, wherein the pluggable interface is matched and connected to the standardized interface of the cell module to realize the insertion and removal operations of the host and the cell module; the fixing device is configured to fix the cell module; the temperature control device includes a liquid chiller and an air conditioner, wherein the liquid chiller is configured to manage the temperature of the cell modules based on the control of the battery management module, and the air conditioner is configured to manage the temperature of the battery system based on the control of the battery management module.

[0017] In a fourth aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored therein, the program codes being adapted to be loaded and run by a processor to perform the modular cell switching method described in any of the above-described technical solutions.

[0018] The above-described technical solutions of this application have at least one or more of the following beneficial effects:

[0019] This application discloses a modular cell switching method applied to a battery system comprising multiple independent cell modules. The method includes: acquiring temperature characteristic data of the cell modules; determining whether the temperature characteristic data of the cell modules meets preset anomaly judgment conditions; if so, performing anomaly verification on the cell modules and identifying problematic cell modules based on the verification results; acquiring the switching priority order of the problematic cell modules; and performing a switching operation on the problematic cell modules based on the switching priority order. This application acquires temperature characteristic data of cell modules, determines whether it meets preset anomaly judgment conditions, performs anomaly verification when the preset anomaly judgment conditions are met to identify problematic cell modules, and then acquires the switching priority order of the problematic cell modules. Relying on a modular cell design, it enables rapid and convenient switching of problematic cell modules, achieving real-time monitoring, accurate location, and convenient replacement of faulty cell modules, thereby reducing maintenance costs and improving the reliability and operational safety of the battery system. Attached Figure Description

[0020] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0021] Figure 1 This is a schematic flowchart of the main steps of a modular cell switching method according to an embodiment of this application;

[0022] Figure 2 This is a detailed flowchart illustrating the steps of a modular cell switching method according to an embodiment of this application;

[0023] Figure 3 This is a detailed flowchart illustrating the steps of a modular cell switching method according to another embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the main structure of a battery system according to an embodiment of this application.

[0025] List of reference numerals in the attached diagram:

[0026] 40: Battery system; 41: Main unit; 411: Plug-in interface; 412: Fixing device; 42: Battery management module; 421: Switching control unit; 43: Cell module; 431: Cell unit; 432: Protection circuit; 433: Standardized interface; 44: Temperature control device; 441: Liquid chiller; 442: Air conditioner; 45: Energy storage converter. Detailed Implementation

[0027] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0028] In the description of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and can also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0029] Currently, traditional battery cell switching systems suffer from problems such as poor compatibility, high safety risks, and high costs associated with overall replacement due to their fixed design. These issues include complex replacement and maintenance processes, reliance on professional personnel, and the need for system shutdown and service interruption.

[0030] To address this, this application provides a modular cell switching method applied to a battery system comprising multiple independent cell modules. This application acquires temperature characteristic data of the cell modules, determines whether the temperature characteristic data meets preset anomaly judgment conditions, and performs anomaly verification on the cell modules when the preset anomaly judgment conditions are met to identify problematic cell modules. Then, it acquires the switching priority order of the problematic cell modules. Based on the modular cell design, the problematic cell modules are switched quickly and conveniently, enabling real-time monitoring, rapid location, and convenient replacement of faulty cell modules, thereby reducing maintenance costs and improving the reliability and operational safety of the battery system.

[0031] See appendix Figure 1 , Figure 1 This is a schematic flowchart illustrating the main steps of a modular cell switching method according to an embodiment of this application. Figure 1 As shown, the modular cell switching method in this application embodiment is applied to a battery system, which includes multiple independent cell modules. The method mainly includes the following steps S101-S105.

[0032] Step S101: Obtain temperature characteristic data of the battery cell module.

[0033] Step S102: Determine whether the temperature characteristic data of the battery cell module meets the preset abnormality judgment conditions.

[0034] Step S103: If yes, perform an anomaly check on the battery cell module and determine the problematic battery cell module based on the check result.

[0035] Step S104: Obtain the switching priority order of the problematic battery cell module;

[0036] Step S105: Based on the switching priority order of the problematic battery cell modules, perform a switching operation on the problematic battery cell modules.

[0037] Based on the above steps S101-S105, this application monitors the status of each cell module in real time. When a cell module malfunctions, the problematic cell module is identified through anomaly verification, and the switching priority order of the problematic cell module is determined. Thus, based on the modular cell design, independent replacement and maintenance of cell modules can be achieved, thereby reducing maintenance costs and improving the flexibility and reliability of the system.

[0038] The following sections will provide further explanation of steps S101 to S105.

[0039] Regarding step S101, in one embodiment, obtaining the temperature characteristic data of the battery cell module includes: obtaining the temperature information of all battery cell modules; and determining the maximum temperature, minimum temperature, and temperature change rate of each battery cell module based on the temperature information of all battery cell modules, as the temperature characteristic data of the battery cell module.

[0040] Specifically, the system collects temperature information from all battery cell modules in real time. Based on this information, it determines the maximum and minimum temperatures across all battery cell modules. Then, it calculates the rate of temperature change for each battery cell module within a unit of time (e.g., 1 minute).

[0041] Regarding step S102, in one embodiment, it is determined whether the temperature characteristic data of the battery cell module meets the preset abnormality judgment conditions.

[0042] Specifically, based on at least one of the maximum temperature, minimum temperature, and temperature change rate in the temperature feature data, it is determined whether a preset anomaly detection condition is met. The preset anomaly detection condition can be set as follows:

[0043] 1) Determine if the temperature change rate of any cell module is ≥ 1℃ / min; or,

[0044] 2) When the maximum temperature is greater than or equal to 40℃ and the minimum temperature is less than 55℃, determine whether any cell module has a temperature change rate greater than or equal to 0.5℃ / min; or,

[0045] 3) Determine whether the maximum temperature is greater than or equal to 55℃.

[0046] If any of the above preset anomaly detection conditions are met, the temperature characteristic data of the battery cell module is determined to meet the preset anomaly detection conditions.

[0047] Regarding step S103, in one embodiment, the step of performing anomaly verification on the battery cell module and determining the problematic battery cell module based on the verification result includes: acquiring the temperature information of all battery cell modules; performing anomaly verification on the battery cell modules using the Grobbs test method based on the temperature information of all battery cell modules to determine the abnormal deviation degree of the battery cell module; determining whether the abnormal deviation degree of the battery cell module is greater than the corresponding preset abnormal threshold value; if so, determining that the temperature information of the battery cell module is an abnormal value and identifying the battery cell module as a problematic battery cell module.

[0048] Specifically, to reduce the impact of a single parameter and improve system reliability, this application introduces the Grubbs test for cross-validation of the battery cell module. This method is a classic statistical approach used to detect single outliers in univariate datasets. The basic idea is: assuming a set of data follows a normal distribution, calculate the deviation between a suspected outlier (such as the initial warning of battery cell module temperature information) and the sample mean, and compare this deviation with the sample standard deviation to obtain the outlier deviation (Gn value). If this deviation is significantly excessive, the value can be statistically determined to be an outlier.

[0049] When applying the Grubbs calibrator method, the temperature information of the battery cell module is used as the value to be verified, xout. The current temperature information of all battery cell modules within the same battery cluster is used as background samples to calculate the anomaly deviation Gn. The calculation formula is as follows:

[0050]

[0051] Where Gn represents the abnormal deviation degree; xout represents the temperature information of the battery cell module; σ is the sample mean, which is the average temperature information of all battery cell modules; σ is the standard deviation of the sample data. The calculation process is as follows: calculate the difference between the temperature information of each battery cell module and the sample mean; calculate the square of each difference; sum the squares of all differences; divide the sum of squares by the number of sample data minus 1 to get the variance; take the square root of the variance to get the sample standard deviation σ.

[0052] The calculated abnormal deviation Gn of the battery cell module is compared with the preset abnormal threshold Gp(n) calculated by the algorithm. If Gn > Gp(n), the temperature information of the battery cell module is determined to be an abnormal value, and the battery cell module is identified as a problematic battery cell module.

[0053] For a one-sided Grubbs test, the pre-defined outlier threshold Gp(n) is calculated using the following formula:

[0054]

[0055] Where N is the number of samples, which is the total number of all cell modules in a battery cluster; This represents the critical value in a t-distribution with N-2 degrees of freedom and a significance level of α / N.

[0056] Regarding step S104, in one embodiment, obtaining the switching priority order of the problematic battery cell module includes: obtaining the voltage difference and capacity deviation of the problematic battery cell module relative to other normal battery cell modules; determining the optimizable coefficient of the problematic battery cell module based on the maximum value of the voltage difference and the capacity deviation; and determining the switching priority order of the problematic battery cell module based on the optimizable coefficient.

[0057] In one embodiment, obtaining the voltage difference and capacity deviation of the problematic battery cell module relative to other normal battery cell modules includes: obtaining voltage information and remaining capacity information of all battery cell modules; determining the average voltage based on the voltage information of all normal battery cell modules; determining the average remaining capacity based on the remaining capacity information of all normal battery cell modules; calculating the difference between the voltage of the problematic battery cell module and the average voltage as the voltage difference; and calculating the difference between the remaining capacity of the problematic battery cell module and the average remaining capacity as the capacity deviation.

[0058] Specifically, the average voltage and average remaining capacity of normal battery cell modules are calculated. The voltage difference is determined based on the difference between the voltage of the problematic battery cell module and the average voltage of the normal battery cell modules. The capacity deviation is obtained based on the difference between the capacity of the problematic battery cell module and the average remaining capacity of the normal battery cell modules.

[0059] The maximum value between the differential pressure and the capacity deviation is used as the optimization coefficient of the problematic battery cell module. All problematic battery cell modules are sorted using their optimization coefficients to determine the switching priority order. The larger the optimization coefficient, the higher the degree of operability and optimization.

[0060] Regarding step S105, in one embodiment, performing a switching operation on the problematic battery cell module based on the switching priority order of the problematic battery cell module includes: obtaining the current operating state of the battery system; and performing a switching operation on the problematic battery cell module according to the switching priority order of the problematic battery cell module based on the current operating state of the battery system.

[0061] Specifically, after determining the switching priority order of the problematic battery cell modules, the current operating state of the battery system is obtained. If the battery system still needs to perform charging and discharging operations, cell switching is required. Based on the current operating state of the battery system, the problematic battery cell modules are switched according to their switching priority order.

[0062] In one embodiment, the current operating state of the battery system includes any one of a charging state, a resting state, and a discharging state. The step of performing a switching operation on the problematic battery cell module based on its current operating state and according to its switching priority order includes: if the current operating state of the battery system is resting, disconnecting the problematic battery cell module from the battery system according to its switching priority order, switching to a backup battery cell module, and issuing a prompt; or, if the current operating state of the battery system is charging, charging the remaining capacity of the backup battery cell module to be switched to until it matches the remaining capacity of other normal battery cell modules in the battery system, disconnecting the problematic battery cell module from the battery system, switching to the backup battery cell module, and issuing a prompt; or, if the current operating state of the battery system is discharging, discharging the remaining capacity of other normal battery cell modules in the battery system until it matches the remaining capacity of the backup battery cell module to be switched to, disconnecting the problematic battery cell module from the battery system, switching to the backup battery cell module, and issuing a prompt.

[0063] Specifically, the battery system can operate in a charging state, a resting state, or a discharging state. Based on the different operating states of the battery system, the switching of problematic cell modules is controlled. The specific switching methods are as follows:

[0064] 1) If the battery system is in a static state, disconnect the problematic cell module from the battery system, switch to the backup cell module, and issue an alarm.

[0065] 2) If the battery system is charging, the remaining capacity (SOC) of the backup cell module to be switched in needs to be charged to match that of the cell module in the system before the backup cell module can be switched in.

[0066] 3) If the battery system is in a discharging state, the battery cell module in the system needs to be discharged until it matches the remaining capacity (SOC) of the backup battery cell module to be switched in before the backup battery cell module can be switched in.

[0067] During the switchover, the connection between the problematic cell module and the battery system is disconnected, and the backup cell module is switched on. At the same time, an alarm is issued to remind the user that replacement or maintenance is in progress. After the switchover is completed, the battery system coordinates to ensure that the system returns to normal working condition.

[0068] In one embodiment, the battery system includes a temperature control device; the method further includes: if the temperature characteristic data of the cell module does not meet the preset abnormality judgment conditions, then controlling the working state of the cell module and / or the temperature control device based on the temperature characteristic data of the cell module.

[0069] In one embodiment, controlling the operating state of the battery cell module and / or the temperature control device based on the temperature characteristic data of the battery cell module includes: controlling the operating power and start / stop state of the battery cell module based on at least one of the maximum temperature, minimum temperature, and temperature change rate, and / or controlling the start / stop state of the temperature control device.

[0070] Specifically, the temperature control device includes a liquid chiller and an air conditioner. When the temperature characteristic data of the battery cell module does not meet the preset abnormal judgment conditions, a normal control strategy can be adopted for the battery cell module. Based on the temperature characteristic data of the battery cell module, namely at least one of the maximum temperature, minimum temperature and temperature change rate, the operating power and start / stop status of the battery cell module, and / or the start / stop status of the temperature control device can be controlled.

[0071] See appendix Figure 2 , Figure 2 This is a detailed flowchart illustrating the steps of a modular cell switching method according to an embodiment of this application; as shown below. Figure 2 As shown, in this embodiment, the modular cell switching method includes the following steps:

[0072] Step S201: Begin;

[0073] Step S202: Obtain temperature characteristic data of the battery cell module;

[0074] Step S203: Determine whether the minimum temperature is less than 0℃. If yes, proceed to step S204; otherwise, proceed to step S205.

[0075] Step S204: Control the cell module to stop working and control the air conditioner to preheat the battery system;

[0076] Step S205: Determine whether the minimum temperature is greater than or equal to 0℃ and the maximum temperature is less than 30℃. If yes, proceed to step S206; otherwise, proceed to step S207.

[0077] Step S206: Control the operating power of the battery cell module to 0.5P;

[0078] Step S207: Determine whether the minimum temperature is greater than or equal to 0℃ and less than 30℃, and whether the maximum temperature is greater than or equal to 30℃ and less than 40℃. If yes, proceed to step S208; otherwise, proceed to step S209.

[0079] Step S208: Control the operating power of the battery cell module to 0.5P;

[0080] Step S209: Determine whether the minimum temperature is greater than or equal to 30℃ and the maximum temperature is less than 40℃. If yes, proceed to step S210; otherwise, proceed to step S215.

[0081] Step S210: Determine whether the rate of temperature change is less than or equal to 1℃ / min. If yes, proceed to step S211; otherwise, proceed to step S212.

[0082] Step S211: Control the operating power of the battery cell module to 0.4P;

[0083] Step S212: Determine whether the temperature change rate is greater than 1℃ / min and less than or equal to 2℃ / min. If yes, proceed to step S213; otherwise, proceed to step S214.

[0084] Step S213: Control the operating power of the battery cell module to 0.2P;

[0085] Step S214: Control the battery cell module to stop working;

[0086] Step S215: Determine whether the minimum temperature is greater than 30℃ and less than 45℃, and whether the maximum temperature is greater than 40℃ and less than 55℃. If yes, proceed to step S216; otherwise, proceed to step S221.

[0087] Step S216: Determine whether the temperature change rate is less than 0.5℃ / min. If yes, proceed to step S213; otherwise, proceed to step S217.

[0088] Step S217: Determine whether the temperature change rate is greater than or equal to 0.5℃ / min and less than or equal to 1℃ / min. If yes, proceed to step S218; if no, determine that the temperature characteristic data of the cell module meets the preset abnormal judgment conditions and proceed to step S220.

[0089] Step S218: Control the operating power of the battery cell module to 0.1P;

[0090] Step S219: Control the liquid cooler to cool down the battery cell module;

[0091] Step S220: Control the battery cell module to stop working;

[0092] Step S221: Determine whether the minimum temperature is greater than or equal to 40℃ and the maximum temperature is less than 55℃. If yes, proceed to step S222; otherwise, proceed to step S223.

[0093] Step S222: Determine whether the temperature change rate is less than 0.5℃ / min. If yes, proceed to step S218; otherwise, determine that the temperature characteristic data of the cell module meets the preset abnormal judgment conditions and proceed to step S220.

[0094] Step S223: Determine whether the maximum temperature is greater than or equal to 55℃. If yes, determine that the temperature characteristic data of the battery cell module meets the preset abnormal judgment conditions and execute step S220; otherwise, execute step S231.

[0095] Step S224: Obtain the problematic battery cell module and the switching priority order of the problematic battery cell module;

[0096] Step S225: Determine whether the battery system needs to continue charging and discharging. If yes, proceed to step S226; otherwise, issue an alarm and proceed to step S231.

[0097] Step S226: Determine whether the battery system is currently in a static state. If yes, proceed to step S227; otherwise, proceed to step S228.

[0098] Step S227: Disconnect the problematic cell module from the battery system, switch to the backup cell module, and issue a prompt;

[0099] Step S228: Determine whether the battery system is currently charging. If yes, proceed to step S229; otherwise, proceed to step S230.

[0100] Step S229: After charging the SOC of the backup cell module to be switched in to match that of the cell module in the system, disconnect the problematic cell module from the battery system and switch in the backup cell module.

[0101] Step S230: After discharging the battery cell module in the system to the same SOC as the backup battery cell module to be switched in, disconnect the problematic battery cell module from the battery system and switch in the backup battery cell module.

[0102] Step S231: End.

[0103] It is understood that the values ​​involved in this embodiment are not specifically limited, and the values ​​can be modified or adjusted according to the actual working conditions when implementing this application.

[0104] See appendix Figure 3 , Figure 3 This is a detailed flowchart illustrating the steps of a modular battery cell switching method according to another embodiment of this application. In one embodiment, the method further includes: determining the problem type of the problematic battery cell module based on the maximum value of the voltage difference and capacity deviation between the problematic battery cell module and other normal battery cell modules; and uploading the charge / discharge data, problem type, and switching priority order of the problematic battery cell module to an experience database, so that the experience database performs the steps of determining the problematic battery cell module, determining the problem type of the problematic battery cell module, and determining the switching priority order based on the charge / discharge data, problem type, and switching priority order of the problematic battery cell module.

[0105] like Figure 3 As shown, after identifying the problematic battery cell module using the Grubbs test method for cross-validation, the problem type of the problematic battery cell module is determined based on the maximum value of the voltage difference and capacity deviation between the problematic battery cell module and other normal battery cell modules. The problem type is such as "large voltage difference" or "large capacity deviation". Then, the charging and discharging data of the problematic battery cell module, the determined problem type and the switching priority order are stored as knowledge cases in the experience base.

[0106] When the battery system detects a cell module that meets the preset anomaly criteria again in the future, the real-time charge and discharge data of that cell module is extracted. Using feature classification techniques (such as pattern recognition and machine learning algorithms), the current abnormal charge and discharge data is matched against all historical cases in the experience base. Based on the matched historical cases, it is inferred whether the current cell module is a problematic cell module and the type of problem. For example, if there are 10 similar cases in the experience base, and 9 of them were diagnosed as "large voltage difference," then this case is likely of the same type. Based on the handling results and severity of historical cases, a switching priority order is assigned to the current problematic cell module. For example, historical cases like "large voltage difference" require immediate handling, so the priority is "high," while some "capacity deviation" cases can be resolved through operation and maintenance scheduling, so the priority is "medium." Finally, the results are obtained regarding whether the cell module meeting the anomaly criteria is a problematic cell module, the type of problem, and the switching priority order. This reduces the reliance on thresholds and transforms into a more intelligent and accurate predictive diagnosis driven by historical experience data.

[0107] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effect of this application, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of this application.

[0108] Furthermore, this application also provides a battery management module configured to execute the modular cell switching method described in any of the embodiments of the above-described modular cell switching method. In one embodiment, the battery management module is used to execute... Figure 1 The modular cell switching method embodiments shown are similar in technical principle, the technical problems solved, and the technical effects produced. Those skilled in the art can clearly understand that, for the sake of convenience and brevity, the specific working process and related descriptions of the battery management module can be found in the embodiments of the modular cell switching method, which will not be repeated here.

[0109] Furthermore, this application also provides a battery system.

[0110] See appendix Figure 4 , Figure 4 This is a main structural block diagram of a battery system according to an embodiment of this application. Figure 4 As shown, the battery system includes multiple independent cell modules, a host, a battery management module, and a temperature control device. The battery management module includes a switching control unit configured to control the insertion and removal of the cell modules from the host based on control commands from the battery management module. Each cell module includes a cell unit and a standardized interface, wherein the cell module is connected to a pluggable interface of the host via the standardized interface. The cell unit is configured to store energy. The host includes a quick-connect mechanism comprising a pluggable interface and a fixing device, wherein the pluggable interface is matched and connected to the standardized interface of the cell module to enable insertion and removal of the host from the cell module. The fixing device is configured to fix the cell module. The temperature control device includes a liquid chiller and an air conditioner, wherein the liquid chiller is configured to manage the temperature of the cell modules based on the control of the battery management module, and the air conditioner is configured to manage the temperature of the battery system based on the control of the battery management module.

[0111] Specifically, the battery system includes multiple independent cell modules, a main unit, a battery management module, and a temperature control device. The main unit is configured to be responsible for energy storage and physical connection; the battery management module is configured to be responsible for cell module status monitoring, power control, and fault handling; and the temperature control device is configured to be responsible for temperature management of the cell modules and the battery system.

[0112] Specifically, the battery management module interacts with the cell module. The cell module sends status data (such as cell voltage, current, temperature, remaining charge (SOC), state of health (SOH)) to the battery management module. Based on the received data, the battery management module outputs control commands to the cell module (such as allowing charging and discharging, adjusting operating power, stopping operation, etc.). The switching control unit is configured to control the insertion / removal of the cell module and the host based on the control commands from the battery management module.

[0113] The battery module includes battery cells and standardized interfaces. The battery cells are basic energy storage units used to store electrical energy. The standardized interfaces enable plug-in connection between the battery modules and the host, allowing for quick switching and flexible expansion of the battery modules to adapt to different capacity requirements. The independent design of the battery modules also makes them easier to replace and maintain.

[0114] In some embodiments, the battery cell module further includes a protection circuit for safety protection of the battery cell module, such as overcharge protection, over-discharge protection, short circuit protection, and overcurrent protection, to prevent damage to the battery cell.

[0115] The main unit includes a quick-connect mechanism for enabling rapid installation and maintenance of the battery cell modules. The quick-connect mechanism includes a pluggable interface and a fixing device. The pluggable interface allows for quick insertion / removal of the battery cell modules, simplifying the replacement process and improving maintenance efficiency. The fixing device is used to secure the battery cell modules, ensuring their stability during connection and preventing them from falling off.

[0116] The temperature control device includes a liquid chiller and an air conditioner. The temperature control device interacts with the battery management module. Based on the temperature characteristic data of the battery cell module, the battery management module sends control commands to the liquid chiller, such as starting the cooling cycle. The liquid chiller returns the execution status to the battery management module to ensure that the battery management module monitors the cooling effect in real time. In addition, the battery management module sends control commands to the air conditioner based on the temperature characteristic data of the battery cell module, such as starting the heating function.

[0117] In some embodiments, the battery system further includes a power storage converter (PCS), which interacts with the battery management module. The power storage converter sends a current power response signal to the battery management module, and the battery management module issues a power control command to the power storage converter based on the state of the cell module (such as temperature characteristic data), so that the power storage converter controls the working state and working power of the cell module based on the power control command.

[0118] Those skilled in the art will understand that all or part of the processes in the method of the above-described embodiment can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0119] Furthermore, this application also provides a computer-readable storage medium. In one embodiment of the computer-readable storage medium according to this application, the computer-readable storage medium can be configured to store a program for performing the modular cell switching method of the above-described method embodiments. This program can be loaded and run by a processor to implement the above-described modular cell switching method. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The computer-readable storage medium can be a memory device formed by various electronic devices. Optionally, in the embodiments of this application, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0120] Furthermore, it should be understood that since the various modules are only provided to illustrate the functional units of the device described in this application, the physical devices corresponding to these modules may be the processor itself, or a part of the processor's software, hardware, or a combination of both. Therefore, the number of modules shown in the figures is merely illustrative.

[0121] Those skilled in the art will understand that the various modules in the device can be adaptively split or combined. Such splitting or combining of specific modules will not cause the technical solution to deviate from the principles of this application; therefore, the technical solutions after splitting or combining will fall within the protection scope of this application.

[0122] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A method of modular cell switching, the method comprising: The method is applied to a battery system comprising a plurality of independent battery cell modules; the method comprises: obtaining temperature characteristic data of the battery cell modules; determining whether the temperature characteristic data of the battery cell modules meets a preset abnormality determination condition; if yes, obtaining temperature information of all the battery cell modules; based on the temperature information of all the battery cell modules, performing abnormality checking on the battery cell modules by using a Grubbs test method to determine an abnormality deviation degree of the battery cell modules; determining whether the abnormality deviation degree of the battery cell modules is greater than a corresponding preset abnormality threshold value; if yes, determining that the temperature information of the battery cell modules is an abnormal value, and determining the battery cell modules as problem battery cell modules; obtaining a switching priority order of the problem battery cell modules; performing a switching operation on the problem battery cell modules based on the switching priority order of the problem battery cell modules; the obtaining of the switching priority order of the problem battery cell modules comprises: obtaining a pressure difference and a capacity deviation of the problem battery cell modules relative to other normal battery cell modules; determining an optimizable coefficient of the problem battery cell modules based on a maximum value of the pressure difference and the capacity deviation; and determining the switching priority order of the problem battery cell modules based on the optimizable coefficient; the performing of the switching operation on the problem battery cell modules based on the switching priority order of the problem battery cell modules comprises: obtaining a current working state of the battery system; and performing the switching operation on the problem battery cell modules according to the switching priority order of the problem battery cell modules based on the current working state of the battery system; the current working state of the battery system comprises any one of a charging state, a standing state and a discharging state; and the performing of the switching operation on the problem battery cell modules according to the switching priority order of the problem battery cell modules based on the current working state of the battery system comprises: in a case where the battery system is in the standing state, disconnecting the problem battery cell modules from the battery system, switching in a standby battery cell module, and issuing an alarm prompt; in a case where the battery system is in the charging state, charging a remaining capacity of the standby battery cell module to be switched in to be consistent with the battery cell modules in the system, switching in the standby battery cell module, and issuing an alarm prompt; and in a case where the battery system is in the discharging state, discharging the battery cell modules in the battery system to be consistent with the remaining capacity of the standby battery cell module to be switched in, switching in the standby battery cell module, and issuing an alarm prompt.

2. The modular cell switching method of claim 1, wherein, the obtaining of the temperature characteristic data of the battery cell modules comprises: obtaining temperature information of all the battery cell modules; based on the temperature information of all the battery cell modules, determining a temperature maximum value, a temperature minimum value and a temperature change rate of each battery cell module as the temperature characteristic data of the battery cell modules.

3. The modular cell switching method of claim 1, wherein, the obtaining of the pressure difference and the capacity deviation of the problem battery cell modules relative to other normal battery cell modules comprises: obtaining voltage information and remaining capacity information of all the battery cell modules; based on the voltage information of all the normal battery cell modules, determining a voltage average value; based on the remaining capacity information of all the normal battery cell modules, determining a remaining capacity average value; calculating a difference between the voltage of the problem battery cell module and the voltage average value as the pressure difference; and calculating a difference between the remaining capacity of the problem battery cell module and the remaining capacity average value as the capacity deviation. The difference between the remaining capacity of the problem cell module and the average remaining capacity is calculated as a capacity deviation.

4. The method of claim 2, wherein, The battery system further comprises a temperature control device; and the method further comprises: If the temperature characteristic data of the cell module does not meet the preset abnormality determination condition, the working state of the cell module and / or the temperature control device is controlled based on the temperature characteristic data of the cell module.

5. The method of claim 4, wherein, The control of the working state of the cell module and / or the temperature control device based on the temperature characteristic data of the cell module comprises: The working power and start-stop state of the cell module and / or the start-stop state of the temperature control device is controlled based on at least one of the maximum temperature, the minimum temperature and the temperature change rate.

6. The method of claim 1 to 5, wherein, The method further comprises: The type of problem of the problem cell module is determined based on the maximum value of the pressure difference and the capacity deviation of the problem cell module relative to other normal cell modules; The charge-discharge data, the type of problem and the switching priority order of the problem cell module are uploaded to an experience library, so that the experience library performs the steps of determining a problem cell module, determining the type of problem of a problem cell module and determining a switching priority order based on the charge-discharge data, the type of problem and the switching priority order of the problem cell module.

7. A battery management module, characterized by, The battery management module is configured to perform the modular cell switching method of any one of claims 1 to 6.

8. A battery system characterized by, The battery system comprises a plurality of independent cell modules, a host, a battery management module as claimed in claim 7 and a temperature control device; wherein, The battery management module comprises a switching control unit configured to control the plugging and unplugging operation of the cell module and the host based on the control instruction of the battery management module; The cell module comprises a cell unit and a standardized interface, wherein the cell module is connected to the plug-in interface of the host through the standardized interface; and the cell unit is configured to store energy; The host comprises a quick connection mechanism, which comprises a plug-in interface and a fixing device, wherein the plug-in interface is matched and connected to the standardized interface of the cell module to realize the plugging and unplugging operation of the host and the cell module; and the fixing device is configured to fix the cell module; The temperature control device comprises a liquid cooling machine and an air conditioner, wherein the liquid cooling machine is configured to perform temperature management on the cell module based on the control of the battery management module, and the air conditioner is configured to perform temperature management on the battery system based on the control of the battery management module.

9. A computer readable storage medium having stored therein a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by the processor to perform the modular cell switching method of any one of claims 1 to 6.

Images