Control method and system for improving battery safety, electronic device and storage medium

Abstract

The application relates to a control method and system for improving battery safety, electronic equipment and a storage medium, the control method comprising: establishing a basic database storing the corresponding relationship between cell data and working condition, the cell data comprising dynamic voltage data, and the working condition comprising the life stage of a battery system, the position of the cell in the battery system and the SOC of the cell; periodically collecting the cell data and working condition of the cell during vehicle operation, comparing the cell data of the cell with the cell data in the basic database when the working condition is most matched, and issuing a reminder when the comparison result exceeds the set range; the control scheme creatively uses dynamic voltage as a safety warning, which can greatly improve the reliability of the battery cell safety warning; potential problems can be identified in advance, and timely warning can be performed, so that the occurrence probability and damage degree of safety accidents can be effectively reduced, and the safety of drivers and passengers and the safety of vehicle property can be effectively protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery safety, and in particular to a control method and system for improving battery safety, an electronic device and a storage medium. BACKGROUND

[0002] With the rapid development of new energy automobile industry, the safety of power storage batteries for automobiles is attracting much attention. In order to ensure the basic safety requirements of storage battery monomers, battery packs or systems, standard test guidelines are given under environments such as vibration, mechanical impact, collision, extrusion, wet heat cycle, immersion, thermal stability, temperature impact, salt spray, high altitude, over-temperature, over-current, over-charging, over-discharging, external short circuit, etc. However, in the actual operation process, there is a lack of effective methods to monitor the safety of the battery in real time, and there are certain safety hazards.

[0003] The method for controlling the safety of the battery in the prior art mainly blocks the heat spread caused by thermal runaway of a single cell by setting a heat insulation material such as an aerogel material layer between the cells, setting a mica plate above the cells, and setting an explosion-proof valve on the battery pack box, etc. However, in the extreme case of multiple cells simultaneously experiencing thermal runaway, such as vehicle rollover, severe collision, battery management system failure, etc., the current heat suppression technology cannot ensure the safety of the battery. SUMMARY

[0004] The present application provides a control method and system for improving battery safety, an electronic device and a storage medium to solve the problem of hidden dangers in battery safety detection in the prior art.

[0005] According to a first aspect of the present application, a control method for improving battery safety is provided, comprising:

[0006] Step 1: establishing a basic database storing the corresponding relationship between cell data and working condition, wherein the cell data includes dynamic voltage data, and the working condition includes the life stage of the battery system, the position of the cell in the battery system and the SOC of the cell;

[0007] Step 2: periodically collecting the cell data of the cell and the working condition during the operation of the vehicle, comparing the cell data of the cell with the cell data in the basic database when the working condition is most matched, and issuing a reminder when the comparison result exceeds the set range.

[0008] On the basis of the above technical solution, the present application can also be improved as follows.

[0009] Optionally, the process of establishing the basic database storing the corresponding relationship between the cell data and the working condition in step 1 comprises:

[0010] Step 101, performing life attenuation test on the extracted multiple sets of battery systems;

[0011] Step 102, recording the cell data of each of the cells under various working conditions until each of the battery systems reaches the life termination stage;

[0012] Step 103, performing disassembly analysis on each cell of each battery system, and storing the corresponding relationship between the cell data of each cell in the battery system and the working condition when each cell is normal in the basic database as a reference.

[0013] Optionally, after the step 1 of establishing the basic database, the method further comprises: sending the data stored in the basic database in the cloud to the vehicle end through a wireless network.

[0014] Optionally, the cell data further comprises: temperature data of each of the cells.

[0015] Optionally, the working condition further comprises: current data of the current sampling point of each cell and working state of the battery, and the working state of the battery comprises discharging and charging.

[0016] Optionally, the step 2 of issuing a reminder when the difference of the comparison result exceeds the set range comprises:

[0017] Step 201, calculating the comparison result as H factor: H-index=U / U0 or H-index=T / T0; wherein U0 and T0 are the dynamic voltage data and temperature data of the cell when the working condition in the basic database is the most matched;

[0018] Step 202, issuing a corresponding reminder according to the range where the value of H-index is located and the setting strategy.

[0019] Optionally, in the step 202,

[0020] When H>1.05, the user is notified to contact the after-sales service within a set time for further investigation and problem confirmation;

[0021] When H>1.1, the user is notified to immediately contact the after-sales service for further investigation and problem confirmation, and to stop using the vehicle.

[0022] According to the second aspect of the present application, a control system for improving the safety of a battery is provided, comprising: a basic database and a battery safety reminding module;

[0023] The basic database is used to store the corresponding relationship between the cell data and the working condition; the cell data comprises dynamic voltage data; and the working condition comprises the life stage of the battery system, the position of the cell in the battery system, and the SOC of the cell.

[0024] The battery safety reminding module is configured to periodically collect the cell data and the working condition of the cell during the operation of the vehicle, compare the cell data with the cell data corresponding to the working condition that best matches the cell data in the basic database, and issue a reminder when the comparison result exceeds a set range.

[0025] According to a third aspect of the present application, an electronic device is provided, comprising a memory and a processor configured to implement the steps of the control method for improving battery safety when executing a computer management program stored in the memory.

[0026] According to a fourth aspect of the present application, a computer readable storage medium is provided, which stores a computer management program that, when executed by a processor, implements the steps of the control method for improving battery safety.

[0027] The control method, system, electronic device and storage medium for improving battery safety provided by the present application creatively use dynamic voltage as a safety warning control scheme, which can greatly improve the reliability of battery cell safety warning, can identify potential problems in advance and then issue timely warnings, can effectively reduce the probability and damage degree of safety accidents, and effectively protects the safety of passengers and vehicle property. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A flowchart of the control method for improving battery safety provided by the present application is provided.

[0029] Figure 2 A hardware structure schematic diagram of a possible electronic device provided by the present application is provided.

[0030] Figure 3 A hardware structure schematic diagram of a possible computer readable storage medium provided by the present application is provided. DETAILED DESCRIPTION

[0031] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and are not intended to limit the scope of the present application.

[0032] Figure 1 A flowchart of the control method for improving battery safety provided by the present application is provided. Figure 1 As shown in the flowchart, the control method comprises:

[0033] Step 1: Establish a basic database storing the corresponding relationship between the cell data and the working condition, wherein the cell data includes dynamic voltage data, and the working condition includes the life stage of the battery system, the position of the cell in the battery system and the SOC of the cell.

[0034] Step 2, periodically collect the cell data of the electric core and the working condition during the operation of the vehicle, compare the cell data of the electric core with the cell data of the working condition in the basic database, and send a reminder when the comparison result exceeds the set range.

[0035] The application provides a control method and system for improving battery safety, an electronic device and a storage medium, which creatively use dynamic voltage as a safety warning control scheme, can greatly improve the reliability of the battery cell safety warning, can identify potential problems in advance, and then give timely warnings, can effectively reduce the probability and damage degree of safety accidents, and effectively protect the safety of the driver and the vehicle property.

[0036] Embodiment 1

[0037] The embodiment 1 provided by the application is an embodiment of the control method for improving battery safety provided by the application, which can be a lithium electronic battery, which combines Figure 1 It can be seen that the embodiment of the control method comprises:

[0038] Step 1, establish a basic database storing the corresponding relationship between the cell data and the working condition, the cell data comprising: dynamic voltage data; the working condition comprising: the life stage of the battery system, the position of the electric core in the battery system and the SOC of the electric core.

[0039] In one possible embodiment, the process of establishing the basic database storing the corresponding relationship between the cell data and the working condition in step 1 comprises:

[0040] Step 101, performing life attenuation test on the extracted multiple sets of battery systems.

[0041] Step 102, record the cell data of each electric core under various working conditions until each set of battery system reaches the end of life stage.

[0042] Step 103, disassemble and analyze each electric core of each battery system, and store the corresponding relationship between the cell data and the working condition when each electric core in the battery system is normal as a reference in the basic database.

[0043] In one possible embodiment, after the basic database is established in step 1, the process further comprises: sending the data stored in the cloud-based basic database to the vehicle end through a wireless network.

[0044] In one possible embodiment, the cell data further comprises: temperature data of each electric core.

[0045] In specific implementation, the dynamic voltage signal function is represented by U, and the temperature signal function is represented by T

[0046] Voltage signal function U = f(x, y, z); temperature signal function T = f'(x, y, z).

[0047] x is the state of health (SOH) of the battery system; y is the state of charge (SOC) of the battery system; and z is the current value within a certain period of time.

[0048] In a possible embodiment, the working condition further includes: the current data of the current sampling point of each cell and the working state of the battery, and the working state of the battery includes discharging and charging.

[0049] Step 2, periodically collect the cell data of the cell and the working condition during the operation of the vehicle, compare the cell data of the cell with the cell data of the working condition most matched in the basic database, and issue a reminder when the comparison result exceeds the set range.

[0050] In a possible embodiment, the step 2 includes:

[0051] Step 201, calculate the comparison result as H-index: H-index = U / U0 or H-index = T / T0; wherein U0 and T0 are the dynamic voltage data and temperature data of the cell when the working condition in the basic database is most matched.

[0052] Step 202, according to the range where the value of H-index is located and the setting strategy, issue a corresponding reminder.

[0053] In a possible embodiment, the step 202 includes:

[0054] When H > 1.05, inform the user to contact the after-sales service within a set time for further investigation and problem confirmation.

[0055] When H > 1.1, inform the user to immediately contact the after-sales service for further investigation and problem confirmation, and stop using the vehicle.

[0056] In a specific implementation, under a certain working condition, the cell voltage signal in the basic database is recorded as U0, and the temperature signal is recorded as T0; the cell voltage signal on the vehicle under the corresponding working condition is recorded as U, and the temperature signal is recorded as T.

[0057] The comparison value of the two is recorded as H-index (H-index)

[0058] H-index = U / U0 or H-index = T / T0.

[0059] The application proposes a calculation strategy for real-time monitoring of dynamic voltage changes of lithium ion batteries, so as to analyze the possible abnormal battery cells. It can be described that a plurality of battery cells are arranged inside the battery system, and each battery cell has a voltage sampling point and a current sampling point. The battery system discharges or charges under certain working conditions, and the voltage of each battery cell dynamically changes with the current. If the consistency of each battery cell inside the battery system is very good, the dynamic voltage of each battery cell is consistent, and no difference will occur. If some or several battery cells inside the battery system show obvious attenuation, the dynamic voltage of the battery cell or the several battery cells will show an outlier phenomenon. The abnormal dynamic voltage existing in the long-term use process can be one of the bases for judging the thermal runaway of the battery cell.

[0060] The implementation of the dynamic voltage analysis strategy proposed by the application is as follows: during the development stage of the battery system, three sets of battery systems are simultaneously subjected to life attenuation tests (the life attenuation includes storage life attenuation and charge-discharge cycle life attenuation), the dynamic voltage changes of each battery cell at different SOCs, different current charging or discharging processes at different life stages are collected, when the test battery systems enter the life termination stage, each battery system is unpacked and the battery cells are disassembled and analyzed to confirm whether each battery cell in the three sets of battery systems is abnormal, if none of them is abnormal, the data and cell position coding information are stored in the storage module as a reference. During the vehicle running process, the dynamic voltage changes of each battery cell at different SOCs are compared with the input reference value at regular intervals, for example, if the deviation from the reference value is more than 3%, that is, H-index>1.03, the user needs to contact the after-sales service within one month for further investigation and problem confirmation; for example, if the deviation from the reference value is more than 5%, that is, H-index>1.05, the user needs to contact the after-sales service within one week for further investigation and problem confirmation; for example, if the deviation from the reference value is more than 10%, that is, H-index>1.1, the user needs to contact the after-sales service immediately for further investigation and problem confirmation, and the vehicle needs to be stopped for use.

[0061] The application is basically divided into three parts: 1) the establishment of a reference database, input to a cloud big data platform, the platform has calculation and analysis capabilities; 2) analyzing and arranging the battery cell voltage data during vehicle driving, and comparing with the reference database; 3) sending early warning information to the user or after-sales according to the comparison result.

[0062] In the battery system development process, a large number of simulated vehicle driving condition tests are carried out on battery systems in different health states, and voltage data, temperature data and the like of the battery systems in different positions are collected; a benchmark database is built by using the above data, and the cloud and the vehicle end are connected and interacted through the 5G network; in the actual vehicle driving process, the working condition conditions close to the benchmark database are identified, and then the voltage information and the temperature information of each battery cell are compared, so that the state of each battery cell is mastered in real time; the battery cells with abnormal comparison results are marked, and the user and the after-sales are notified for timely and effective treatment.

[0063] Embodiment 2

[0064] The embodiment 2 provided by the application is an embodiment of the control system for improving the safety of the battery, and the embodiment of the control system comprises a basic database and a battery safety reminding module.

[0065] The basic database is used for storing the corresponding relationship between the battery cell data and the working condition conditions; the battery cell data comprises dynamic voltage data; and the working condition conditions comprise the life stage of the battery system, the position of the battery cell in the battery system and the SOC of the battery cell.

[0066] In a possible embodiment mode, the process of establishing the basic database in which the corresponding relationship between the battery cell data and the working condition conditions is stored comprises:

[0067] Step 101, performing life attenuation tests on the extracted multiple sets of battery systems.

[0068] Step 102, recording the battery cell data of each battery cell under various working condition conditions until each set of battery system reaches the life termination stage.

[0069] Step 103, disassembling and analyzing each battery cell of each set of battery system, and storing the corresponding relationship between the battery cell data and the working condition conditions when each battery cell in the battery system is normal as a benchmark in the basic database.

[0070] In a possible embodiment mode, after the basic database is established, the process further comprises: sending the data stored in the basic database in the cloud to the vehicle end through the wireless network.

[0071] In a possible embodiment mode, the battery cell data further comprises temperature data of each battery cell.

[0072] In the specific implementation, the dynamic voltage signal function is represented by U, and the temperature signal function is represented by T.

[0073] The voltage signal function U=f(x,y,z); and the temperature signal function T=f'(x,y,z).

[0074] x is the state of health (SOH) of the battery system; y is the state of charge (SOC) of the battery system; and z is the current value in a certain period of time.

[0075] In a possible implementation manner, the working condition further includes: current data of the current sampling point of each battery cell and the working state of the battery, and the working state of the battery includes discharging and charging.

[0076] The battery safety reminding module is configured to periodically collect the battery cell data of the battery cell and the working condition during the operation of the vehicle, compare the battery cell data of the battery cell with the battery cell data corresponding to the working condition that is most matched in the basic database, and send a reminder when the comparison result exceeds a set range.

[0077] In a possible implementation manner, the battery safety reminding module sends a reminder when the difference of the comparison result exceeds the set range, including:

[0078] Step 201: calculating the comparison result as an H-index: H-index = U / U0 or H-index = T / T0; wherein U0 and T0 are the dynamic voltage data and temperature data of the battery cell corresponding to the working condition that is most matched in the basic database.

[0079] Step 202: sending a corresponding reminder according to the range in which the value of the H-index is located and a setting strategy.

[0080] In a possible implementation manner, in step 202:

[0081] When H > 1.05, the user is notified to contact the after-sales service within a set time to further investigate and confirm the problem.

[0082] When H > 1.1, the user is notified to immediately contact the after-sales service to further investigate and confirm the problem, and the vehicle is stopped from being used.

[0083] Please refer to Figure 2 , Figure 2 An embodiment of an electronic device provided by the embodiment of the present application is shown in the following figure. Figure 2As shown in the figure, the embodiment of the application provides an electronic device, which comprises a memory 1310, a processor 1320, and a computer program 1311 stored in the memory 1310 and capable of running on the processor 1320, and the processor 1320 implements the following steps when executing the computer program 1311: establishing a basic database storing a corresponding relationship between cell data and working condition, wherein the cell data comprises dynamic voltage data, and the working condition comprises a life stage of a battery system, a position of the cell in the battery system, and an SOC of the cell; periodically collecting the cell data and the working condition of the cell during vehicle operation, and comparing the cell data of the cell with the cell data corresponding to the working condition that is most matched in the basic database, and issuing a reminder when the comparison result exceeds a set range.

[0084] Please refer to Figure 3 , Figure 3 An embodiment of a computer readable storage medium provided by the application is shown in the figure. As Figure 3 shown, the embodiment provides a computer readable storage medium 1400, which stores a computer program 1411, and the computer program 1411 implements the following steps when executed by a processor: establishing a basic database storing a corresponding relationship between cell data and working condition, wherein the cell data comprises dynamic voltage data, and the working condition comprises a life stage of a battery system, a position of the cell in the battery system, and an SOC of the cell; periodically collecting the cell data and the working condition of the cell during vehicle operation, and comparing the cell data of the cell with the cell data corresponding to the working condition that is most matched in the basic database, and issuing a reminder when the comparison result exceeds a set range.

[0085] The application also provides specific test scheme embodiments through embodiment 3, embodiment 4 and embodiment 5.

[0086] Embodiment 3

[0087] The embodiment 3 provided by the application is a specific test scheme embodiment one of the control method, system, electronic device and storage medium for improving battery safety provided by the application, and the specific test scheme embodiment one comprises:

[0088] During the development stage of the battery system, three sets of battery systems are simultaneously subjected to life attenuation tests.

[0089] The life attenuation mode adopted is: 30 days of normal temperature storage + 100 cycles of normal temperature charging and discharging + 30 days of 45 DEG C storage + 100 cycles of 35 DEG C charging and discharging.

[0090] Collect the dynamic voltage information of each battery cell at different SoC when the battery system life is at 100% SoH (State of Health, SoC), 98% SoH, 95% SoH, 92% SoH, 90% SoH, 88% SoH, 85% SoH, 82% SoH, 80% SoH, 78% SoH, 75% SoH, 73% SoH, and 70% SoH, respectively.

[0091] The different SoC are 100% SoC, 95% SoC, 90% SoC, 85% SoH, 80% SoH, 75% SoH, 70% SoH, 65% SoH, 60% SoH, 55% SoH, 50% SoH, 45% SoH, 40% SoH, 35% SoH, 30% SoH, 25% SoH, 20% SoH, 15% SoH, 10% SoH, 5% SoH, and 0% SoH, respectively.

[0092] The charging process and the discharging process can adopt 0.33C, 0.5C, 1C, 2C, 3C, etc. For example, when the battery system is at 80% SoH, the battery system is charged at 1C rate from 20% SoC to 80% SoC, and the dynamic voltage change data of each battery cell is obtained. When the battery system used for testing enters the end-of-life stage, each battery system is unpacked and the battery cells are disassembled for analysis to confirm whether each battery cell in the three battery systems is abnormal. If all the battery cells are normal, the data and the cell position coding information are stored in the storage module as a reference. During the operation of the vehicle, the dynamic voltage change of each battery cell at different SoC is compared with the input reference value at regular intervals. If the deviation from the reference value exceeds 3%, the user needs to contact the after-sales service within one month for further investigation and problem confirmation. If the deviation exceeds 5%, the user needs to contact the after-sales service within one week for further investigation and problem confirmation. If the deviation exceeds 10%, the user needs to contact the after-sales service immediately for further investigation and problem confirmation, and the vehicle needs to be stopped for use.

[0093] Embodiment 4

[0094] The embodiment 4 provided by the application is a specific test scheme embodiment two of the control method, system, electronic equipment and storage medium for improving battery safety provided by the application, and the specific test scheme embodiment two comprises:

[0095] During the development stage of the battery system, three sets of battery systems are simultaneously subjected to life attenuation tests.

[0096] The life attenuation mode adopted is that from Monday to Friday, charging is performed once a day, followed by WLTC working condition discharging, and the rest of the time is for storage; from Saturday to Sunday, charging is performed twice a day, followed by WLTC working condition discharging, and the rest of the time is for storage.

[0097] Collect the dynamic voltage information of each battery cell at different SoC when the battery system life is at 100% SoH (State of Health, SoC), 98% SoH, 95% SoH, 92% SoH, 90% SoH, 88% SoH, 85% SoH, 82% SoH, 80% SoH, 78% SoH, 75% SoH, 73% SoH, and 70% SoH, respectively.

[0098] The different SoC are 100% SoC, 95% SoC, 90% SoC, 85% SoC, 80% SoC, 75% SoC, 70% SoC, 65% SoC, 60% SoC, 55% SoC, 50% SoC, 45% SoC, 40% SoC, 35% SoC, 30% SoC, 25% SoC, 20% SoC, 15% SoC, 10% SoC, 5% SoC, and 0% SoC, respectively.

[0099] The charging rate of the charging process can be 0.33C, 0.5C, 1C, 2C, 3C, and the like.

[0100] For example, when the battery system is at 80% SoH, the battery system is charged at 1C rate from 20% SoC to 80% SoC to obtain the dynamic voltage change data of each battery cell. The working condition discharge is carried out according to the charging / discharging power of WLTC, and the dynamic voltage change of each battery cell from 80% SoC to 75% SoC is recorded. When the battery system used for testing enters the end-of-life stage, each battery system is unpacked and the battery cells are disassembled for analysis to confirm whether there is any abnormality in each battery cell in the three battery systems. If there is no abnormality, the data and cell position coding information are stored in the storage module as a reference. During the operation of the vehicle, the dynamic voltage change of each battery cell at different SoC is compared with the input reference value at regular intervals. If the deviation from the reference value exceeds 3%, the user needs to contact the after-sales service within one month for further investigation and problem confirmation. If the deviation exceeds 5%, the user needs to contact the after-sales service within one week for further investigation and problem confirmation. If the deviation exceeds 10%, the user needs to contact the after-sales service immediately for further investigation and problem confirmation, and the vehicle needs to be stopped for use.

[0101] Embodiment 5

[0102] The embodiment 5 provided by the application is a specific test scheme embodiment three of the control method, system, electronic equipment and storage medium for improving the battery safety provided by the application. The specific test scheme embodiment three comprises:

[0103] During the development stage of the battery system, the life attenuation test is simultaneously performed on the three battery systems.

[0104] The life attenuation mode is: from Monday to Friday, charging once a day, then discharging in CLTC mode, and storing the rest of the time; from Saturday to Sunday, charging twice a day, then discharging in CLTC mode, and storing the rest of the time.

[0105] The dynamic voltage information of each battery cell at different SoC when the battery system life is at 100% SoH (State of Health, SoC), 98% SoH, 95% SoH, 92% SoH, 90% SoH, 88% SoH, 85% SoH, 82% SoH, 80% SoH, 78% SoH, 75% SoH, 73% SoH, 70% SoH, respectively, is collected.

[0106] The different SoC is 100% SoC, 95% SoC, 90% SoC, 85% SoC, 80% SoC, 75% SoC, 70% SoC, 65% SoC, 60% SoC, 55% SoC, 50% SoC, 45% SoC, 40% SoC, 35% SoC, 30% SoC, 25% SoC, 20% SoC, 15% SoC, 10% SoC, 5% SoC, 0% SoC, respectively.

[0107] The charging rate of the charging process can be 0.33C, 0.5C, 1C, 2C, 3C, etc.

[0108] For example, when the battery system is at 80% SoH, the battery system is charged from 20% SoC to 80% SoC at 1C rate, and the dynamic voltage change data of each battery cell is obtained. The battery system is discharged in the working condition according to the charging / discharging power of CLTC, and the dynamic voltage change of each battery cell from 80% SoC to 75% SoC is recorded. When the battery system used in the test enters the end-of-life stage, each battery system is unpacked and the battery cells are disassembled for analysis to confirm whether there is any abnormality in each battery cell in the three battery systems. If there is no abnormality, the data and cell position coding information are stored in the storage module as a reference. During vehicle operation, the dynamic voltage change of each battery cell at different SoC is compared with the input reference value at regular intervals. If the deviation from the reference value exceeds 3%, the user needs to contact the after-sales service within a month for further investigation and problem confirmation; if the deviation exceeds 5%, the user needs to contact the after-sales service within a week for further investigation and problem confirmation; if the deviation exceeds 10%, the user needs to contact the after-sales service immediately for further investigation and problem confirmation, and the vehicle needs to be stopped for use.

[0109] The embodiment of the application provides a control method and system for improving battery safety, electronic equipment and a storage medium, which creatively uses dynamic voltage as a control scheme for safety warning; in the development stage of a battery system, the life attenuation of multiple sets of battery systems is tested (the life attenuation includes storage life attenuation and charge-discharge cycle life attenuation), the dynamic voltage change of each battery cell in different SOC, different current charging or discharging processes corresponding to different life stages is collected, when the battery system used for testing enters the life termination stage, each set of battery system is unpacked and the battery cell is disassembled and analyzed, whether each battery cell in the three sets of battery systems is abnormal is confirmed, if all the battery cells are normal, the data and the battery cell position coding information are stored in the storage module as a reference. During the operation of the vehicle, the dynamic voltage change of each battery cell at different SOC is compared with the input reference value periodically, for example, when the deviation of the reference value is more than 3%, that is, H-index>1.03, the user needs to be notified to contact the after-sales service for further investigation and problem confirmation within one month; for example, when the deviation of the reference value is more than 5%, that is, H-index>1.05, the user needs to be notified to contact the after-sales service for further investigation and problem confirmation within one week; for example, when the deviation of the reference value is more than 10%, that is, H-index>1.1, the user needs to be notified to contact the after-sales service for further investigation and problem confirmation immediately, and the vehicle is stopped for use; during the development of the battery system, a large number of tests of simulated whole vehicle driving conditions are carried out on battery systems with different health states, and voltage data, temperature data and the like of battery cells in different positions of the battery system are collected; a reference database is built by using the above data, and the cloud and the vehicle end are connected and interacted through the 5G network; in the actual vehicle driving process, the working condition close to the reference database is recognized, then the voltage information and the temperature information of each battery cell are compared, so that the state of each battery cell is mastered in real time; the battery cell with an abnormal comparison result is marked, and is focused on and followed up, and the user and the after-sales service are notified to process in time; the reliability of the lithium ion battery cell safety warning can be improved to a great extent; potential problems can be identified in advance, then timely warning can be carried out, the probability and damage degree of safety accidents can be effectively reduced, and the safety of the driver and the vehicle property is effectively protected.

[0110] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0111] Those skilled in the art will appreciate that embodiments of the present application can be devised for a variety of applications. It is intended that the present application be limited only by the scope of the appended claims, and it is intended that various modifications and alterations made by those skilled in the art be considered as within the scope of the present application. The embodiments of the present application will be described with reference to the attached drawings, wherein:

[0112] The present application is described in reference to the drawings using a flowchart and / or a block diagram of the method, apparatus (system) and computer program product according to embodiments of the application. It will be understood that each block of the flowchart and / or block diagram, and combinations of blocks in the flowchart and / or block diagram, 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 computer, 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 means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0113] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0114] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0115] While the preferred embodiments of the application have been described, additional variations and modifications can be made to the embodiments by those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to cover all such modifications and variations as fall within the scope of the present application.

[0116] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A control method for improving battery safety, characterized in that, The control method includes: Step 1: Establish a basic database that stores the correspondence between cell data and operating conditions. The cell data includes: dynamic voltage data U; the operating conditions include: the life stage of the battery system, the position of the cell in the battery system, and the state of charge (SOC) of the cell. Step 2: Periodically collect battery cell data and operating conditions during vehicle operation, compare the battery cell data with the battery cell data in the basic database when the operating conditions best match, and issue a reminder when the comparison result of any battery cell exceeds the set range. The process of establishing the basic database storing the correspondence between battery cell data and operating conditions in step 1 includes: Step 101: Conduct life degradation tests on the extracted battery systems. Step 102: Record the cell data of each cell under various operating conditions until each battery system reaches the end of its lifespan. Step 103: Disassemble and analyze each cell of each battery system, and store the correspondence between cell data and operating conditions when there are no abnormalities in each cell of the battery system as a benchmark in the basic database. The cell data also includes: temperature data T for each cell.

2. The control method according to claim 1, characterized in that, After establishing the basic database in step 1, the method further includes: sending the data stored in the basic database in the cloud to the vehicle via a wireless network.

3. The control method according to claim 1, characterized in that, The operating conditions also include: current data from the current sampling points of each cell and the battery's operating status, which includes discharging and charging.

4. The control method according to claim 3, characterized in that, The alert issued in step 2 when the difference in the comparison results exceeds a set range includes: Step 201: Calculate the comparison result as H-index, where H-index = U / U0 or H-index = T / T0; where U0 and T0 are the dynamic voltage data and temperature data of the cell when the operating conditions are most matched in the basic database, respectively. Step 202: Issue a corresponding reminder based on the range of H-index values ​​and the setting strategy.

5. A control system for improving battery safety, employing the control method for improving battery safety as described in any one of claims 1-4, characterized in that, include: Basic database and battery safety reminder module; The basic database is used to store the correspondence between cell data and operating conditions; The cell data includes: dynamic voltage data; the operating conditions include: the life stage of the battery system, the cell's position in the battery system, and the cell's SOC; The battery safety reminder module is used to periodically collect cell data and operating conditions of the battery cells during vehicle operation, compare the cell data with the cell data in the basic database when the operating conditions best match, and issue a reminder when the comparison result exceeds a set range.

6. An electronic device, characterized in that, It includes a memory and a processor, wherein the processor is used to implement the steps of the control method for improving battery safety as described in any one of claims 1-4 when executing a computer program stored in the memory.

7. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the steps of the control method for improving battery safety as described in any one of claims 1-4.

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