Battery Risk Warning Method, Device, Equipment, Medium and Program Product

Abstract

The present application provides a battery risk warning method, device, equipment, medium and program product, belonging to the technical field of batteries. Among them, the battery risk warning method includes charging a battery under test at a preset power level in a first mode, and obtaining first charging data of the battery under test during the first-mode charging; charging the battery under test after the first-mode charging in a second mode, and obtaining second charging data of the battery under test during the second-mode charging; determining a current warning value of the battery under test based on the first charging data and the second charging data; and determining that the battery under test is in a risk state in response to the current warning value and the historical warning value of the battery under test meeting a preset warning condition. The battery risk warning method of the present application can quickly evaluate the calendar life risk of the battery.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery risk warning method, device, equipment, medium and program product. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of society. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmental protection advantages. For electric vehicles, battery technology is an important factor related to their development.

[0003] The calendar life of a battery refers to the performance degradation of the battery caused only by the passage of time in a non-use state. This is a natural attenuation process independent of the usage frequency, mainly caused by chemical reactions and material aging inside the battery. How to quickly evaluate the risk of the calendar life has a crucial impact on the use and deployment of the battery. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the background art. For this reason, an object of the present application is to provide a battery risk warning method, device, equipment, medium and program product to quickly evaluate the risk of the battery calendar life.

[0005] An embodiment of the first aspect of the present application provides a battery risk warning method, including: charging a battery under test at a preset power level in a first mode, and obtaining first charging data of the battery under test during the first-mode charging; charging the battery under test after the first-mode charging in a second mode, and obtaining second charging data of the battery under test during the second-mode charging; determining a current warning value of the battery under test based on the first charging data and the second charging data; and determining that the battery under test is in a risk state in response to the current warning value and the historical warning value of the battery under test satisfying a preset warning condition.

[0006] In the technical solution of the embodiment of the present application, the first charging data and the second charging data of the battery under test are obtained through the first-mode charging and the second-mode charging, and then the current warning value is determined. According to the current warning value and the historical warning value, it is determined whether the battery under test is currently in a risk state. It is not necessary to go through the entire calendar test cycle to quickly determine whether the battery has a calendar life risk, that is, quickly obtain the test risk, and identify abnormal batteries with risks in advance, so that batteries with risks can be intercepted in time for further improvement, greatly shortening the calendar life test time, being beneficial to improving the efficiency of battery testing and research and development, and saving test resources.

[0007] In some embodiments, charging a battery under test with a preset power level in a first mode includes: performing constant-current charging on the battery under test with a preset power level based on a first charging rate until the voltage of the battery under test reaches the maximum voltage; wherein the first charging rate A1 satisfies: 0.1Cn A1 Cn is a preset capacity value or the remaining capacity measured by the battery under test during the determination process of the previous warning value.

[0008] By performing constant-current charging on the battery under test at the first charging rate, the charging current can be maintained at the maximum allowable value, enabling the battery power to be quickly charged to a certain level and achieving efficient and rapid charging. At the same time, the control logic of constant-current charging is simple, easy to implement, and has a low cost. At the same time, by reasonably setting the first charging rate, it is possible to reduce the discharge current, reduce the pressure of internal chemical reactions in the battery, reduce the loss of electrode materials, extend the life, and at the same time, reduce the internal polarization reaction of the battery, improve the charging efficiency, and effectively enhance the safety of the battery.

[0009] In some embodiments, charging the battery under test after the first-mode charging in a second mode includes: performing constant-voltage charging on the battery under test after the first-mode charging until the current of the battery under test reaches the cut-off current; wherein the cut-off current B satisfies , Cn is a preset capacity value or the remaining capacity measured by the battery under test during the determination process of the previous warning value.

[0010] By adopting constant-voltage charging after constant-current charging until the charging is completed, overcharging can be avoided, the battery can be protected, and the battery life can be extended. At the same time, by reasonably setting the cut-off current, it can ensure that the battery is fully charged, contribute to the accuracy of the current remaining capacity of the battery obtained in the fully charged state, improve safety, and optimize the charging efficiency.

[0011] In some embodiments, determining the current warning value of the battery under test based on the first charging data and the second charging data includes: determining the differential voltage curve of the battery under test based on the first charging data; determining the first peak time based on the differential voltage curve, where the first peak time is used to characterize the peak time when the negative electrode material of the battery under test undergoes a phase transformation; determining the current warning value of the battery under test based on the first peak time, the first charging data, and the second charging data.

[0012] In this embodiment, the differential voltage curve can be determined through the first charging data, and the current warning value can be obtained based on the differential voltage curve, so as to accurately reflect the change of lithium deposition on the negative electrode, and thus play an accurate warning role, which is beneficial to the effectiveness of risk state judgment.

[0013] In some embodiments, determining the first peak time based on the differential voltage curve includes: determining the occurrence time of the peak within the first preset state of charge range in the differential voltage curve as the first peak time, where the first preset state of charge range SOC1 satisfies: 50% SOC1 .

[0014] In this embodiment, by defining the first preset state of charge range, the peak time when the negative electrode material undergoes a phase transition in the differential voltage curve can be accurately found, that is, the first peak time can be accurately obtained.

[0015] In some embodiments, determining the current warning value of the battery under test based on the first peak time, the first charging data, and the second charging data includes: based on the first charging data, determining the first charge amount charged by the battery under test from the first peak time to the end of the first-mode charging; based on the second charging data, determining the second charge amount charged by the battery under test from the end of the first charging to the end of the second-mode charging; and determining the ratio of the first charge amount to the second charge amount as the current warning value of the battery under test.

[0016] Through this embodiment, the current warning value can be obtained, and the current warning value can be accurately and effectively used to reflect the risk state of the battery under test.

[0017] In some embodiments, in response to the current warning value and the historical warning value of the battery under test satisfying the preset warning condition, determining that the battery under test is in a risk state includes: based on the current warning value and the historical warning value of the battery under test, determining a warning data set, where the warning data set includes each warning value of the battery under test determined in chronological order; in response to the warning data set continuously showing a decrease in the warning value and the decrease amplitude of the warning value increasing sequentially, determining that the battery under test is in a risk state.

[0018] In this embodiment, by determining that the warning value continuously decreases and the decrease amplitude gradually increases, it can be accurately determined that the battery is in a risk state, improving the accuracy of risk warning.

[0019] In some embodiments, in response to the warning data set continuously showing a decrease in the warning value and the decrease amplitude of the warning value increasing sequentially, determining that the battery under test is in a risk state includes: in response to the warning data set first showing a decrease in the warning value and the decrease amplitude of the warning value satisfying the first threshold, determining that the battery under test is in a first-level warning state; in response to the warning data set showing a decrease in the warning value continuously twice and the decrease amplitude of the warning value increasing sequentially, determining that the battery under test is in a second-level warning state; in response to the warning data set showing a decrease in the warning value continuously three times and the decrease amplitude of the warning value increasing sequentially, determining that the battery under test is in a third-level warning state, where the third-level warning state is used to represent that the battery under test is in a risk state.

[0020] In this embodiment, a three - level early warning mechanism can be used to achieve step - by - step early warning, quickly and accurately determine whether the battery is in a risk state, and improve the accuracy of risk early warning.

[0021] In some embodiments, the method further includes: discharging the battery under test in a first mode until the power of the battery under test reaches a preset power; where the preset power E satisfies E0, and E0 is the rated power of the battery under test.

[0022] In this embodiment, discharging in the first mode can reduce the power of the battery under test, thereby increasing the data volume of the first charging data and the second charging data in the subsequent process, so as to facilitate the accurate analysis of the risk state of the battery.

[0023] In some embodiments, discharging the battery under test in the first mode includes: performing constant - current discharge on the battery under test based on a first discharge rate; where the first discharge rate D1 satisfies: D1 , and Cn is a preset capacity value or the remaining capacity measured by the battery under test during the determination process of the previous warning value.

[0024] In this embodiment, constant - current discharge has the advantages of stable current, reliable data, and simple control. At the same time, by reasonably setting the first discharge rate, the battery life can be extended, the discharge capacity can be increased, the influence of internal resistance can be reduced, and the safety can be improved.

[0025] In some embodiments, the method further includes: in response to the current warning value and the historical warning value of the battery under test not meeting the preset warning conditions, determining the current remaining capacity of the battery under test; in response to the current remaining capacity not decaying to the preset state or the total test duration of the battery under test not reaching the preset duration, performing high - temperature storage on the battery under test; and executing the determination process of the next warning value of the battery under test.

[0026] In this embodiment, when there is no risk state, the calendar life test can be continued, and calendar aging can be achieved for the battery without risks, so as to obtain the calendar life of the battery.

[0027] In some embodiments, determining the current remaining capacity of the battery under test includes: discharging the battery under test in a second mode until the voltage of the battery under test reaches the minimum voltage, and obtaining the first discharge data of the battery under test during the second - mode discharge; and determining the current remaining capacity of the battery under test based on the first discharge data.

[0028] Discharging the battery under test to the minimum voltage through the first - mode discharge can accurately obtain the current remaining capacity of the battery under test, and can prevent over - charging, which is beneficial to the battery life and safety.

[0029] In some embodiments, discharging the battery under test in the second mode includes: performing constant-current discharging on the battery under test based on the second discharge rate; wherein, the second discharge rate D2 satisfies: 0 D2 , where Cn is a preset capacity value or the remaining capacity measured for the battery under test during the determination process of the previous warning value.

[0030] Constant-current discharging has the advantages of stable current, reliable data, and simple control. It can accurately measure the remaining capacity of the battery. At the same time, by reasonably setting the second discharge rate, the battery life can be extended, the discharge capacity can be increased, the influence of internal resistance can be reduced, and the safety can be improved.

[0031] In some embodiments, after discharging the battery under test in the second mode until the battery power of the battery under test reaches the minimum voltage, the method further includes: charging the battery under test in the third mode until the battery under test reaches the second preset state of charge; wherein, the second preset state of charge SOC2 satisfies: 90% SOC2 .

[0032] After measuring the current remaining capacity during discharging in the second mode and before storage, the battery under test can be charged so that it is in a fully charged state or close to a fully charged state, and the battery SOC can be adjusted for aging tests, that is, for the next round of tests.

[0033] In some embodiments, charging the battery under test in the third mode includes: performing constant-current charging on the battery under test based on the second charge rate; wherein, the second charge rate A2 satisfies: 0 A2 , where Cn is a preset capacity value or the remaining capacity measured for the battery under test during the determination process of the previous warning value.

[0034] In this embodiment, by performing constant-current charging on the battery under test at the second charge rate, the charging current can be maintained at the maximum allowable value, and the battery power can be quickly charged to full charge to achieve efficient and fast charging. At the same time, the control logic of constant-current charging is simple, easy to implement, has a low cost, and is safe and reliable.

[0035] An embodiment of the second aspect of the present application provides a battery risk warning device, including: a first acquisition module, configured to charge a battery under test at a preset power in a first mode and acquire first charging data of the battery under test during the first-mode charging; a second acquisition module, configured to charge the battery under test after the first-mode charging in a second mode and acquire second charging data of the battery under test during the second-mode charging; a first determination module, configured to determine a current warning value of the battery under test based on the first charging data and the second charging data; and a second determination module, configured to determine that the battery under test is in a risk state in response to the current warning value and a historical warning value of the battery under test satisfying a preset warning condition.

[0036] An embodiment of the third aspect of the present application provides a computing device, including: at least one processor; and at least one memory communicatively connected to the at least one processor, where the at least one memory stores instructions that, when executed alone or jointly by the at least one processor, cause the computing device to execute the battery risk warning method in the above embodiments.

[0037] An embodiment of the fourth aspect of the present application provides a computer-readable storage medium storing instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to execute the battery risk warning method in the above embodiments.

[0038] An embodiment of the fifth aspect of the present application provides a computer program product including instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to execute the battery risk warning method in the above embodiments.

[0039] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific implementation manners of the present application. Description of the Drawings

[0040] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed according to the present application and should not be regarded as limiting the scope of the present application.

[0041] Figure 1 It is a flowchart of the battery risk warning method provided for some embodiments of the present application;

[0042] Figure 2 It is a differential voltage curve provided for some embodiments of the present application;

[0043] Figure 3The current change curve during charging in the second mode provided by some embodiments of the present application;

[0044] Figure 4 The calendar life decay curve of the battery under test provided by some embodiments of the present application;

[0045] Figure 5 The warning value change curve of the battery under test provided by some embodiments of the present application;

[0046] Figure 6 The schematic diagram of the battery risk warning device provided by some embodiments of the present application;

[0047] Figure 7 The schematic diagram of the computing device for implementing the battery risk warning method provided by some embodiments of the present application. Detailed implementation manners

[0048] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0051] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this text, the character " / " generally represents an "or" relationship between the associated objects before and after.

[0053] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0054] In the description of the embodiments of this application, for technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of this application.

[0055] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0056] Currently, from the perspective of the development of the market situation, rechargeable batteries are more and more widely used. Rechargeable batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in various electronic devices, such as electric vehicles, electric motorcycles, electric cars and other electric transportation means, as well as military equipment, aerospace and other fields. With the continuous expansion of the application fields of rechargeable batteries, the market demand is also constantly increasing.

[0057] The calendar life of a battery refers to the performance degradation of the battery due only to the passage of time in a non - use state, during which it is either not used or used only slightly. This is a natural attenuation process independent of the usage frequency, mainly caused by chemical reactions and material aging inside the battery. It can be understood that the calendar life test can detect whether a battery has a life - risk. Batteries with risks can be intercepted in time to avoid losses to users when they are put into use. For batteries that pass the test, they can be released for safe use by users.

[0058] In related technologies, the calendar life test of a battery is to store the battery at a specific temperature for a period of time, then test the remaining capacity, and continuously repeat this process until the test duration meets the requirements (such as one year or two years). By analyzing the remaining capacity obtained by this method, the attenuation of the calendar life can be judged, so as to evaluate whether the battery has a calendar life risk.

[0059] However, since the calendar life test takes a long time, usually at least one year or two years to obtain effective evaluation results, that is, it takes a long time to determine whether a battery has a calendar life risk, resulting in too long test and R & D cycles for the battery.

[0060] In view of the above problems, the embodiment of the present application provides a battery risk warning method, which can be used in the calendar life test of a battery. By charging the battery under test at a preset power level in a first mode and obtaining the first charging data of the battery under test during the first - mode charging; charging the battery under test after the first - mode charging in a second mode and obtaining the second charging data of the battery under test during the second - mode charging; determining the current warning value of the battery under test based on the first charging data and the second charging data; and in response to the current warning value and the historical warning value of the battery under test meeting the preset warning conditions, determining that the battery under test is in a risk state. Thus, it can quickly determine whether a battery has a calendar life risk through the warning value, so as to intercept in time the batteries with calendar life risks for further improvement, greatly shortening the calendar life test time and the test and R & D cycles of the battery.

[0061] The battery risk warning method provided by the embodiments of the present application can be applied to the calendar life test of batteries to quickly expose the calendar life risks of batteries (i.e., to achieve the pre-exposure of the life risks of stored battery cells). It can be understood that the method provided by the embodiments of the present application is not limited to the calendar life test, and it can also be used in other scenarios that require risk warning for batteries. For example, it can be used in the ORT (Ongoing Reliability Testing) detection of mass-produced batteries (such as including cycle life tests or storage calendar aging tests), or the method provided by this embodiment can also be used in the test of batteries that have been put into use. For example, for the batteries of electric vehicles, after the electric vehicles are used, the charging data can be collected through the BMS (Battery Management System), or charging piles, etc. to implement the battery risk warning method provided by this embodiment.

[0062] The batteries involved in the embodiments of the present application can be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium-metal batteries, sodium-metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc. In addition, the batteries involved in the embodiments of the present application can be the batteries in electric vehicles, and they can also be the batteries in other electrical equipment or energy storage devices.

[0063] The energy storage device in the embodiments of the present application can include one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster can include multiple batteries, and the multiple batteries are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0064] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during the low electricity consumption period and provide electrical energy to relevant users or electrical equipment during the high electricity consumption period. The energy storage system provided by the embodiments of the present application can be any power system that requires the use of an energy storage device. As an example, the energy storage device is an energy storage container or an energy storage cabinet.

[0065] The electrical equipment in the embodiments of the present application can be, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] It should be understood that the battery involved in the embodiments of the present application is not only limited to the energy storage device and electrical equipment described above, but can also be applicable to all battery devices including a box body and electrical equipment using the battery device.

[0067] For the sake of convenience of description, the battery risk warning method provided in this embodiment will be elaborated below in combination with the scenario of calendar life test. The same applies to other test scenarios and will not be elaborated any further.

[0068] Figure 1 It is a schematic flow chart of the battery risk warning method provided in some embodiments of the present application. Please refer to Figure 1 In the embodiments of the present application, a battery risk warning method 100 is provided, including the following steps S110 to S140.

[0069] In step S110, the battery under test at a preset power is charged in a first mode, and first charging data of the battery under test during the first-mode charging is obtained.

[0070] In step S120, the battery under test after the first-mode charging is charged in a second mode, and second charging data of the battery under test during the second-mode charging is obtained.

[0071] In step S130, based on the first charging data and the second charging data, the current warning value of the battery under test is determined.

[0072] In step S140, in response to the current warning value and the historical warning value of the battery under test satisfying a preset warning condition, it is determined that the battery under test is in a risk state.

[0073] Specifically, the preset power can be a certain specific power value or power range. For example, it can be 50%, 40%, 30%, 20% or 0 of the rated power of the battery, and can be specifically set according to the actual situation. The battery under test refers to the battery to be subjected to risk assessment. The category of the battery can refer to the above description and will not be elaborated here.

[0074] The first-mode charging means that the battery is charged in a certain specific charging mode, and this charging mode can be a constant current (CC, Constant Current) charging mode, a constant voltage (Constant Voltage) charging mode, a fast charging mode, a trickle charging mode, a segmented charging mode, etc.

[0075] The first charging data refers to the relevant data during the first-mode charging, such as the data of the voltage, current, capacity, etc. changing with time and the start and end times of charging, and can be specifically collected according to the charging mode.

[0076] The second charging mode refers to charging the battery in another specific charging mode, which can also be a constant current (CC) charging mode, a constant voltage (CV) charging mode, a fast charging mode, a trickle charging mode, a segmented charging mode, etc. It can be understood that the charging modes of the first mode charging and the second mode charging can be different. For example, the first mode charging can be constant current charging, the second mode charging can be constant voltage charging, and so on.

[0077] The second charging data refers to relevant data during the second mode charging process, such as data on changes in voltage, current, capacity, etc. over time and charging start and end times, etc., and can be specifically collected according to the charging mode.

[0078] In this embodiment, in step S110, the battery to be tested at a preset power level may be charged in a first mode to obtain first charging data.

[0079] After step S110 , the battery to be tested may then be charged in a second mode to obtain second charging data.

[0080] After obtaining the first charging data in step S110 and the second charging data in step S120 , the first charging data and the second charging data may be processed, such as by differential processing, to obtain a current warning value.

[0081] It can be understood that in the calendar life test, multiple rounds of testing need to be performed in cycles, and each round of testing requires the battery to be stored at a specific temperature for a period of time, and then the remaining capacity of the battery is tested. The method 100 provided in this embodiment can be applied to each round of testing, that is, steps S110 to S140 can be performed after each round of storage, and the current warning value is the warning value measured in the current round. The historical warning value is each warning value determined before the current warning value, that is, each warning value obtained in each round before the current round.

[0082] In step S140, it is possible to determine whether the battery to be tested is currently in a risky state by judging whether the current warning value and the historical warning value satisfy a preset warning condition.

[0083] The preset warning condition may be a change pattern of the warning value, such as a continuous decrease in the warning value or a turning point in the warning value, which may be determined based on comparative tests. Being in a risky state means that the battery to be tested has a life risk and needs to be intercepted.

[0084] It can be understood that if the preset warning condition is not met, it can be determined that the current battery is not in a risk state, and the next round of testing can be carried out. If the preset warning condition is met, it is determined that the battery under test has a calendar life risk, and at the same time, the test is ended, that is, the calendar life test can be ended in advance without performing the next round of testing.

[0085] In some embodiments, in order to obtain accurate test results, after the battery under test is used for a period of time (short-term use + long-term static), the above steps S110 to S120 can be performed once. In addition, before charging in step S110, the battery power can be reduced to less than 50% (preset power) as much as possible. It can be understood that in the actual test process, the steps S110 to S140 provided in this embodiment can be incorporated into other test processes according to frequency / time, for example: in the cycle test, the above steps can be performed once every 100-200 cls, and in the storage test, the above steps can be performed once every 10-30 days of storage.

[0086] In this embodiment, the first charging data and the second charging data of the battery under test can be obtained through the first mode of charging and the second mode of charging, and then the current warning value can be determined. According to the current warning value and the historical warning value, it can be determined whether the battery under test is currently in a risk state. Compared with the calendar test method in the related technology to find the risky battery, the method provided in this embodiment can quickly determine whether the battery has a calendar life risk without going through the entire calendar test cycle, that is, quickly obtain the test risk, identify the abnormal battery with risk in advance, so that the risky battery can be intercepted in time for further improvement, greatly shortening the calendar life test time, which is beneficial to improving the efficiency of battery test and research and saving test resources.

[0087] According to some embodiments of the present application, the first mode of charging the battery under test at the preset power in step S110 may include: based on the first charging rate, performing constant current charging on the battery under test at the preset power until the voltage of the battery under test reaches the maximum voltage; where the first charging rate A1 satisfies: 0.1Cn A1 Cn is the preset capacity value or the remaining capacity measured by the battery under test in the process of determining the previous warning value.

[0088] In this embodiment, the first mode of charging may refer to constant current charging (CC) at the first charging rate, and when the voltage of the battery under test reaches the maximum voltage Vmax, the constant current charging is stopped. Among them, constant current charging means that the charging current remains constant during the charging process. The maximum voltage refers to the maximum voltage during the battery charging process. Ensuring that the voltage does not exceed the maximum voltage during the charging process can prevent the battery from overcharging and is beneficial to the battery life and safety.

[0089] Among them, the remaining capacity refers to the amount of electricity that the battery can still release under the current state. The first charging rate A1 is a parameter used to describe the charging speed of the battery, and it can be expressed as the ratio of the charging current of the battery to Cn. Among them, Cn can adopt a preset capacity value, that is, in multiple rounds, Cn adopts a fixed value. This preset capacity value can be, for example, the rated capacity of the battery to be tested or the remaining capacity measured in the first round (the first warning value determination process) in the calendar life test. Of course, the value of Cn can also change according to different test rounds. For example, since the calendar life test needs to be carried out in multiple rounds, the Cn value can also be the remaining capacity measured in the previous warning value determination process of the battery to be tested, that is, the remaining capacity measured in the previous round of the battery to be tested (abbreviated as the previous remaining capacity), and the remaining capacity of the previous round is used as the value of Cn in each round.

[0090] In this embodiment, the first charging rate A1 can adopt 0.1Cn, 0.15Cn, 0.2Cn, 0.25Cn, 0.3Cn, 0.32Cn, 0.33Cn, etc.

[0091] In some embodiments, the charging condition of the first mode can be 0.33Cn CC Vmax, that is, constant current charging is carried out at a current of 0.33 times the preset capacity value or the previous remaining capacity. When the battery voltage reaches the set maximum voltage Vmax, the constant current charging stops.

[0092] In this embodiment, by performing constant current charging on the battery to be tested at the first charging rate, the charging current can be maintained at the maximum allowable value, enabling the battery power to be quickly charged to a certain level and achieving efficient and rapid charging. At the same time, the control logic of constant current charging is simple, easy to implement, and has a low cost. At the same time, by reasonably setting the first charging rate, the discharge current can be reduced, the pressure of internal chemical reactions of the battery can be reduced, the loss of electrode materials can be reduced, the service life can be extended, at the same time, the internal polarization reaction of the battery can be reduced, the charging efficiency can be improved, and the safety of the battery can be effectively improved.

[0093] According to some embodiments of the present application, the second mode charging of the battery to be tested after the first mode charging in step S120 may include: performing constant voltage charging on the battery to be tested after the first mode charging until the current of the battery to be tested reaches the cut-off current; where the cut-off current B satisfies , and Cn is the preset capacity value or the remaining capacity measured in the previous warning value determination process of the battery to be tested.

[0094] In this embodiment, after charging in the first mode, it is possible to switch to charging in the second mode. Charging in the second mode may refer to constant voltage charging (CV), and when the current of the battery under test reaches the cut-off current, the constant voltage charging stops. Among them, constant voltage charging means that the charging voltage remains constant during the charging process.

[0095] Among them, the cut-off current B is the current threshold used to determine whether the charging is completed during the battery charging process. In this embodiment, , the value of Cn can refer to the above embodiment and will not be elaborated here.

[0096] In this embodiment, the cut-off current B can be 0.02Cn, 0.03Cn, 0.04Cn, 0.05Cn, etc.

[0097] In some embodiments, the charging condition in the second mode can be Vmax CV 0.04Cn, that is, when the voltage in the first mode of charging reaches Vmax, it switches to constant voltage charging, and the charging current gradually decreases. When it reaches 0.04Cn, the charging in the second mode terminates.

[0098] In this embodiment, by using constant voltage charging until the charging is completed after constant current charging, overcharging can be avoided, the battery can be protected, and the battery life can be extended. At the same time, by reasonably setting the cut-off current, it can ensure that the battery is fully charged, which helps to improve the accuracy of the current remaining battery capacity obtained in the fully charged state, and can also improve safety and optimize the charging efficiency.

[0099] According to some embodiments of the present application, determining the current warning value of the battery under test based on the first charging data and the second charging data in step S130 may include: determining the differential voltage curve of the battery under test based on the first charging data; determining the first peak time based on the differential voltage curve, where the first peak time is used to represent the peak time when the negative electrode material of the battery under test undergoes a phase transformation; determining the current warning value of the battery under test based on the first peak time, the first charging data, and the second charging data.

[0100] In this embodiment, taking constant current charging as an example, the first charging data may include the data V of the voltage of the battery under test changing with time and the data Q of the capacity of the battery under test changing with time, and the differential voltage curve can be obtained by dV / dQ.

[0101] Figure 2 For the differential voltage curve provided by some embodiments of the present application, please refer to Figure 2 , Figure 2 is the voltage differential curve when the battery under test at a preset power is charged with a constant current until the voltage of the battery under test reaches the maximum voltage stage based on the first charging rate.

[0102] The first peak moment T1 may be the peak moment when the negative electrode material of the battery to be tested undergoes a phase transition, for example, the moment corresponding to the phase transition peak of the negative electrode material graphite from the LiC12 phase to the LiC6 phase. For example, it may be determined by the moment corresponding to the peak of the differential voltage curve in a specific voltage range.

[0103] It can be understood that the specific voltage range may be related to the type of battery. For example, the peak value of a lithium iron phosphate battery appears at about 3.5V, and that of a ternary lithium battery appears at about 3.7V. The first peak moment T1 may be determined through the above specific range.

[0104] The current warning value may be obtained according to the first peak moment and the first charging data and the second charging data.

[0105] It can be understood that when the inventors of the present application differentiated according to the first charging data, they found that the differential capacitance curve (dQ / dV) represents the amount of charge that the material can charge and discharge under a unit voltage change. At high SOC (State of Charge), the potential of graphite remains near 0V, and even if lithium deposition occurs, the potential of graphite will not change much. However, the positive electrode material, especially the ternary nickel-cobalt-manganese material, will cause a significant change in voltage due to the collapse of the lithium-poor phase material. Therefore, the differential capacitance curve under high SOC reflects the change of the positive electrode material, rather than the change of lithium deposition at the negative electrode, so it cannot play an accurate early warning role. In this embodiment, the differential voltage curve can be determined according to the first charging data, and the current early warning value can be obtained according to the differential voltage curve, so that the change of lithium deposition at the negative electrode can be accurately reflected, and then an accurate early warning role can be played, which is beneficial to the effectiveness of risk status judgment.

[0106] According to some embodiments of the present application, determining the first peak moment based on the differential voltage curve includes: determining the occurrence time of the peak in the differential voltage curve within the first preset state of charge range as the first peak moment, wherein the first preset state of charge range SOC1 satisfies: 50% SOC1 .

[0107] The state of charge (SOC) is a parameter that describes the current remaining power of the battery, usually expressed as a percentage. The first preset state of charge range SOC1 satisfies: 50% SOC1 It can be understood that there is usually only one peak in this range, and this peak corresponds to the moment when the phase transition peak of the negative electrode material graphite from the LiC12 phase to the LiC6 phase corresponds to.

[0108] Please refer to Figure 2, the voltage differential curve also fluctuates in the early stage and has peaks. By limiting the first preset state of charge range, the peak time when the negative electrode material in the differential voltage curve undergoes a phase transition can be accurately found, that is, the first peak time T1 is accurately obtained.

[0109] According to some embodiments of the present application, determining the current warning value of the battery under test based on the first peak time, the first charging data, and the second charging data in the above steps may include: determining, based on the first charging data, the first amount of charge charged into the battery under test from the first peak time to the end of the first charging in the first mode; determining, based on the second charging data, the second amount of charge charged into the battery under test from the end of the first charging to the end of the second charging in the second mode; and determining the ratio of the first amount of charge to the second amount of charge as the current warning value of the battery under test.

[0110] In this embodiment, the first charging data further includes the first charging end time T2, that is, the charging end time of the first mode charging. For example, it is the time when the voltage of the battery under test reaches the maximum voltage during the first mode charging, such as Figure 2 the time T2 in. The first charging data may further include the first change data of the current over time. It can be understood that during constant current charging, the current is a constant value.

[0111] Figure 3 Please refer to Figure 3 , Figure 3 which is the current change curve during the second mode charging provided by some embodiments of the present application.

[0112] Among them, the starting time of the current change curve corresponds to the first charging end time T2 of the first mode charging. The second charging data further includes the second charging end time, that is, the charging end time of the second mode charging. For example, it is the time when the battery under test reaches the cut-off current during the second mode charging, such as Figure 3 the time T3 in.

[0113] The second charging data may further include the second change data of the current over time. It can be understood that during constant voltage charging, the current is change data, as shown in Figure 3 .

[0114] After obtaining T1, T2, and T3, the current warning value can be obtained according to T1, T2, T3, and the current in the two-mode charging. According to the first amount of charge charged into the battery under test during the time period from T1 to T2 and the second amount of charge charged into the battery under test during the time period from T2 to T3 , the current warning value is obtained.

[0115] It can be understood that the first battery charge can be calculated by calculating the charge amount charged during the first-mode charging (constant-current charging) phase from time T1 to T2, where is the charging current of the first-mode charging.

[0116] The second battery charge can be calculated by calculating the charge amount charged during the second-mode charging (constant-voltage charging) phase from time T2 to T3, where, is the charging current of the second-mode charging, which is a variable value.

[0117] The current warning value can be calculated based on the first battery charge and the second battery charge, .

[0118] Through this embodiment, the current warning value can be obtained, and the current warning value can be accurately and effectively used to reflect the risk state of the battery under test.

[0119] According to some embodiments of the present application, in response to the current warning value and the historical warning value of the battery under test satisfying a preset warning condition, determining that the battery under test is in a risk state may include: based on the current warning value and the historical warning value of the battery under test, determining a warning data set, where the warning data set includes each warning value of the battery under test determined in chronological order; in response to the warning data set continuously showing a decrease in the warning value and the decrease amplitude increasing sequentially, determining that the battery under test is in a risk state.

[0120] In this embodiment, a warning data set can be obtained based on the current warning value and the historical warning value. It can be understood that the warning data set can be a data sequence, that is, each warning data added to the warning data set in turn according to the rounds of the calendar life test. It can be understood that the current warning value is always the last warning value data in the warning data set.

[0121] Of course, the form of the warning data set can also be a curve, for example, a relationship curve between the test days (which can be the storage days of the battery in the calendar life test) and the warning value.

[0122] It can be understood that by determining that each warning value in the warning data set continuously decreases and the decrease amplitude increases sequentially, it can be determined that the battery under test is in a risk state. It can be understood that continuously decreasing can mean continuously decreasing 2 times, continuously decreasing 3 times, or continuously decreasing 4 times, etc.

[0123] It can be understood that when problems such as lithium plating occur in the battery cells, since the lithium intercalation process changes from only intercalating lithium into graphite to intercalating lithium into graphite and depositing lithium metal, there is an additional lithium plating process, which will cause the value of Q2 to increase and the value of Q1 to decrease, and the warning value will show an obvious decrease. Therefore, it is possible to accurately determine whether the battery is in a risk state by the decrease of the warning value.

[0124] In this embodiment, by judging that the warning value continuously decreases and the decreasing amplitude gradually increases, it is possible to accurately determine that the battery is in a risk state and improve the accuracy of risk warning.

[0125] According to some embodiments of the present application, in response to the warning value in the warning data set continuously decreasing and the decreasing amplitude of the warning value increasing in sequence, determining that the battery under test is in a risk state may include: in response to the warning value in the warning data set decreasing for the first time and the decreasing amplitude of the warning value meeting the first threshold, determining that the battery under test is in a first-level warning state; in response to the warning value in the warning data set decreasing continuously twice and the decreasing amplitude of the warning value increasing in sequence, determining that the battery under test is in a second-level warning state; in response to the warning value in the warning data set decreasing continuously three times and the decreasing amplitude of the warning value increasing in sequence, determining that the battery under test is in a third-level warning state, where the third-level warning state is used to represent that the battery under test is in a risk state.

[0126] This embodiment can adopt a three-level warning mechanism. When the third-level warning state is reached, it is determined that the battery is in a risk state. In the first-level risk state and the second-level risk state, only prompts can be made and no processing is performed.

[0127] It can be understood that the current warning value is represented as , the previous warning value of the current warning value (that is, the warning value determined in the previous round) is represented as , and so on. The warning data set can be represented as , where i is the cumulative number of rounds of the current calendar life test.

[0128] When the warning value in the warning data set decreases for the first time, that is, when first appears, and the difference between the two ( ) exceeds the first threshold, it can be considered that the battery under test is in a first-level warning state. Among them, the first threshold can be determined according to actual experimental tests, and it can be zero or other numbers.

[0129] When the warning value in the warning data set decreases continuously twice and the decreasing amplitude of the warning value increases in sequence, it can be understood that , and . When this state appears, it can be determined that the battery under test is currently in a second-level warning state.

[0130] When the warning value in the warning data set decreases three times in a row and the decrease amplitude of the warning value becomes larger successively, it can be understood that , and . When this state occurs, it can be determined that the battery under test is currently in the third-level warning state, that is, in a risk state.

[0131] Figure 4 is the calendar life attenuation curve of the battery under test provided by some embodiments of the present application, Figure 5 is the warning value change curve of the battery under test provided by some embodiments of the present application. Please refer to Figure 4 and Figure 5 . In order to obtain an accurate warning mechanism, two groups of battery cells are used as control groups in this embodiment, and two parallel sample battery cells are used in each group. The battery cells in the first group (the black curve in the figure) can be normal battery cells. For comparison, the second group (the gray curve in the figure) can be abnormal battery cells (i.e., battery cells expected to have calendar life risks) made by replacing electrode materials and other methods.

[0132] In order to accurately verify the method provided by this embodiment, the calendar life test method is used to perform calendar life tests on the two groups of battery cells respectively, that is, the battery is stored at a specific temperature for a period of time, and then the remaining capacity is tested, and the above storage and remaining capacity tests are repeated until the battery capacity decays to a preset state, so as to obtain Figure 4 the calendar life attenuation curve, that is, the relationship curve between the capacity retention rate of the battery cell and the storage days. Through Figure 4 it can be seen that when the second group of battery cells are stored for about 100 days, the remaining capacity shows an obvious decrease.

[0133] At the same time, the warning value can be calculated each time after storage by this method 100, and a warning value data set is obtained, and the warning value data set is displayed by using the relationship curve between the warning value and the storage days shown in Figure 5 .

[0134] However Figure 5 in, through the warning value, it is found that when the second group of battery cells are tested in the second round, the warning value has already decreased slightly. In the third round of testing, an obvious lithium plating signal appears (that is, the curve shows an obvious decrease). At the same time, when the first group of battery cells are stored for about 120 days, a lithium plating signal also appears.

[0135] Based on the above experimental analysis and principle analysis, a three-level warning mechanism can be obtained, that is:

[0136] First-level warning state: The warning value decreases for the first time.

[0137] Second-level warning state: The warning value decreases continuously twice, and the decrease amplitude becomes larger.

[0138] Three - level warning state: The warning value decreases three times in a row, and the decreasing amplitude gradually becomes larger.

[0139] In addition, it can be understood that Figure 5 in, through the three - level warning mechanism, for the second group of battery cells, when an obvious lithium plating signal appears (i.e., in the risk state), the time is about 45 days, that is, it only takes about 45 days to confirm that there is a risk in this battery cell, while Figure 4 in, judging whether there is a risk through the capacity retention rate requires at least about 100 days. Thus, it can be seen that the method 100 can quickly determine whether the battery has calendar life risk.

[0140] In this embodiment, through the three - level warning mechanism, it is possible to achieve step - by - step warning, quickly and accurately judge whether the battery is in a risk state, and improve the accuracy of risk warning.

[0141] According to some embodiments of the present application, the method 100 may further include: discharging the battery under test in a first mode until the power of the battery under test reaches a preset power; wherein, the preset power E satisfies 0.5E0, where E0 is the rated power of the battery under test.

[0142] Specifically, before step S110, the battery under test can also be discharged in the first mode, so as to reduce the power of the battery under test, facilitate subsequent charging, and improve the effectiveness of the obtained charging data. The first - mode discharge can be constant - current discharge, constant - voltage discharge, constant - power discharge, pulse discharge, or constant - resistance discharge, etc.

[0143] It can be understood that the stop condition of the first - mode discharge is that the power of the battery under test reaches the preset power E. In this embodiment, 0.5E0, where E0 is the rated power of the battery under test, and E can be 0, that is, the lower limit of the power of the battery under test corresponds to a power of 0%, and of course, E can also be 0.1E0, 0.2E0, 0.3E0, 0.4E0, 0.5E0, etc.

[0144] It can be understood that for lithium iron phosphate batteries, the first - mode discharge can discharge the voltage below 3.3V, and for ternary lithium batteries, the voltage can be discharged below 3.6V, so that the power of the battery under test reaches the preset power.

[0145] In this embodiment, through the first - mode discharge, the power of the battery under test can be reduced, thereby increasing the data volume of the first charging data and the second charging data in the subsequent process, so as to facilitate the accurate analysis of the risk state of the battery.

[0146] According to some embodiments of the present application, discharging the battery under test in the first mode may include: discharging the battery under test at a constant current based on the first discharge rate; wherein, the first discharge rate D1 satisfies: D1 , where Cn is a preset capacity value or the remaining capacity measured during the determination process of the previous warning value of the battery under test.

[0147] In this embodiment, the first-mode discharge may refer to a constant-current discharge (DC) at the first discharge rate, and when the power of the battery under test reaches the preset power, the constant-current discharge is stopped. Among them, the constant-current discharge means that the battery releases electrical energy in the form of a constant current.

[0148] Among them, the first discharge rate D1 is a parameter used to describe the speed of the battery discharge, and it can be expressed as the ratio of the discharge current of the battery to Cn. In this embodiment, D1 , for example, the first discharge rate D1 can be 0.1Cn, 0.2Cn, 0.3Cn, 0.33Cn, 0.4Cn, 0.5Cn, 0.6Cn, 0.7Cn, 0.8Cn, 0.9Cn, 1.0Cn, etc. The value of Cn can refer to the above embodiments and will not be elaborated here.

[0149] In some embodiments, the first-mode discharge condition may be 0.33Cn DC Vmin, that is, a constant-current discharge is performed at a current of 0.33 times the preset capacity value or the previous remaining capacity until the voltage drops to Vmin. Here, Vmin may refer to the minimum voltage Vmin of the battery under test. It can be understood that when the discharge reaches the minimum voltage, the power corresponds to 0.

[0150] In this embodiment, the constant-current discharge has the advantages of stable current, reliable data, and simple control. At the same time, by reasonably setting the first discharge rate, the battery life can be extended, the discharge capacity can be improved, the influence of the internal resistance can be reduced, and the safety can be improved.

[0151] According to some embodiments of the present application, method 100 may further include the following steps: in response to the current warning value and the historical warning value of the battery under test not meeting the preset warning conditions, determining the current remaining capacity of the battery under test; in response to the current remaining capacity not decaying to the preset state or the total test duration of the battery under test not reaching the preset duration, performing high-temperature storage on the battery under test; and performing the determination process of the next warning value of the battery under test.

[0152] It can be understood that when method 100 is used for calendar life testing, when it is determined that the current warning value and the historical warning value of the battery under test do not meet the preset warning conditions, if the battery under test has not reached the third-level warning state, the remaining capacity test can be performed on the battery under test to obtain the current remaining capacity of the battery under test. The current remaining capacity is the electrical energy that the battery can still release in the current state.

[0153] The preset state can be represented by the state of health (SOH) of the battery. For example, it can be 60% SOH. Of course, it can also be 70% SOH or 80% SOH, and can be specifically set according to the actual situation. The preset number of days can be the total planned number of days for the calendar life test. For example, the preset number of days can be 500 days, etc.

[0154] It can be understood that the storage for the calendar life test can be carried out in a high-temperature environment to accelerate calendar aging. When the current remaining capacity has not decayed to the preset state or the total number of test days of the battery under test has not reached the preset number of days, high-temperature storage can continue for a certain number of days (such as 15 days). Among them, the temperature for high-temperature storage can be in the range of 45 degrees to 70 degrees.

[0155] After high-temperature storage, the process of determining the next warning value of the battery under test can be executed, that is, return to execute steps S110 to S140 to perform the next round of tests, so as to determine the next warning value of the current warning value, that is, the next warning value.

[0156] In addition, method 100 can include: in response to the current remaining capacity decaying to the preset state or the total test duration of the battery under test reaching the preset duration, ending the calendar life test of the battery under test. It can be understood,

[0157] In the related art, when the battery under test is in the calendar life test, the test end condition is that the current remaining capacity decays to the preset state or the total test duration of the battery under test reaches the preset duration. After the test ends, all test data are analyzed to determine whether the battery has risks. In this embodiment, for the battery under test in a risk state, the calendar life test can be ended in advance without waiting until the test end condition is reached, and the battery in the risk state can be discovered in time, shortening the test time.

[0158] In this embodiment, when there is no risk state, the calendar life test can continue. For the battery without risks, calendar aging can be achieved to obtain the calendar life of the battery.

[0159] According to some embodiments of the present application, determining the current remaining capacity of the battery under test in the above steps includes: discharging the battery under test in the second mode until the voltage of the battery under test reaches the minimum voltage, and obtaining the first discharge data during the second-mode discharge of the battery under test; based on the first discharge data, determining the current remaining capacity of the battery under test.

[0160] It can be understood that when the battery under test is charged to full charge in the second mode, the voltage of the battery under test can be discharged to the minimum voltage Vmin through the second-mode discharge. Among them, the minimum voltage refers to the minimum voltage during the battery discharge process. Ensuring that the voltage during the discharge process does not fall below the minimum voltage can prevent the battery from over-discharging, which is beneficial to the life and safety of the battery.

[0161] The second-mode discharge can be the same as or different from the first-mode discharge. The second-mode discharge can be constant current discharge, constant voltage discharge, constant power discharge, pulse discharge, or constant resistance discharge, etc. It can be understood that the stop condition for the second-mode discharge is that the power of the battery under test reaches the minimum voltage.

[0162] Meanwhile, the first discharge data during the second-mode discharge can be recorded. The first discharge data can be the discharge time and discharge current of the second-mode discharge, etc., so that the current remaining capacity of the battery under test can be calculated based on the first discharge data. It can be understood that the current remaining capacity can be used as Cn for the next round.

[0163] By discharging the battery under test to the minimum voltage through the first-mode discharge, the current remaining capacity of the battery under test can be accurately obtained, and overcharging can be prevented, which is beneficial to the battery life and safety.

[0164] According to some embodiments of the present application, the second-mode discharge of the battery under test in the above steps includes: performing constant current discharge on the battery under test based on the second discharge rate; wherein, the second discharge rate D2 satisfies: 0 D2 , where Cn is a preset capacity value or the remaining capacity measured during the determination process of the previous warning value of the battery under test.

[0165] In this embodiment, the second-mode discharge may refer to constant current discharge at the second discharge rate, and when the voltage of the battery under test reaches the minimum voltage, the constant current discharge stops.

[0166] Among them, the second discharge rate D2 is a parameter used to describe the speed of battery discharge, and it can be expressed as the ratio of the discharge current of the battery to Cn. In this embodiment, 0 D2 , for example, the first discharge rate D2 can be 0.1Cn, 0.2Cn, 0.3Cn, 0.33Cn, 0.4Cn, 0.5Cn, 0.6Cn, 0.7Cn, 0.8Cn, 0.9Cn, 1.0Cn, etc. The value of Cn can refer to the above embodiments and will not be elaborated here.

[0167] In some embodiments, the second-mode discharge condition can be 0.33Cn DC Vmin, that is, constant current discharge is performed at a current of 0.33 times the preset capacity value or the previous remaining capacity until the voltage drops to Vmin. Here, Vmin can refer to the minimum voltage Vmin of the battery under test.

[0168] Constant current discharge has the advantages of stable current, reliable data, and simple control. It can accurately measure the remaining capacity of the battery. At the same time, by reasonably setting the second discharge rate, the battery life can be extended, the discharge capacity can be increased, the influence of internal resistance can be reduced, and the safety can be improved.

[0169] According to some embodiments of the present application, after discharging the battery under test in the second mode until the power of the battery under test reaches the minimum voltage in the above steps, method 100 may further include: charging the battery under test in the third mode until the battery under test reaches the second preset state of charge.

[0170] Among them, the second preset state of charge SOC2 satisfies: 90% SOC2 .

[0171] The third mode of charging means that the battery is charged in a certain specific charging mode, and this charging mode can be a constant current charging mode, a constant voltage charging mode, a fast charging mode, a trickle charging mode, a segmented charging mode, and other charging modes. The charging cut-off condition for the third mode of charging can be that the voltage of the battery under test reaches the second preset state of charge SOC2. In this embodiment, 90% SOC2 , for example, it can be 90%, 92%, 94%, 96%, 98%, 100%, and so on. It can be understood that the third charging mode can be the same as the first charging mode, but it can also be different.

[0172] After discharging in the second mode and measuring the current remaining capacity, and before storing, the battery under test can be charged so that it is in a fully charged or nearly fully charged state, and the battery SOC can be adjusted for aging tests, that is, for the next round of tests.

[0173] According to some embodiments of the present application, charging the battery under test in the third mode in the above steps includes: performing constant current charging on the battery under test based on the second charging rate; among them, the second charging rate A2 satisfies: 0 A2 Cn is a preset capacity value or the remaining capacity measured by the battery under test during the determination process of the previous warning value.

[0174] In this embodiment, the third mode of charging may refer to constant current charging (CC) at the second charging rate, and when the voltage of the battery under test reaches the second preset state of charge, the constant current charging is stopped.

[0175] Among them, the second charging rate A2 is a parameter used to describe the charging speed of the battery, and it can be expressed as the ratio of the charging current of the battery to Cn. The value of Cn can refer to the above embodiments and will not be elaborated here.

[0176] In this embodiment, the second charging rate A2 can be 0.1Cn, 0.2Cn, 0.3Cn, 0.33Cn, etc.

[0177] In some embodiments, the charging condition for the third mode can be 0.33Cn CC Vmax, that is, constant current charging is performed at a current of 0.33 times the preset capacity value or the previous remaining capacity. When the battery voltage reaches the set maximum voltage Vmax, the constant current charging stops. It can be understood that when the battery voltage reaches Vmax, the battery is close to full charge, and the SOC of the battery satisfies the second preset state of charge.

[0178] In this embodiment, by performing constant current charging on the battery under test at the second charging rate, the charging current can be maintained at the maximum allowable value, enabling the battery power to be quickly charged to full charge and achieving efficient and rapid charging. At the same time, the control logic of constant current charging is simple, easy to implement, low in cost, and safe and reliable.

[0179] In addition, it can be understood that the voltage of the battery can be stabilized by standing still for a period of time, such as 5 minutes, before or between each charge and discharge step, which is beneficial to the accuracy of the measured data. For example, standing still can be adopted before the first mode of discharge, between the first mode of discharge and the first mode of charging, between the first mode of charging and the second mode of charging, between the second mode of charging and the second mode of discharge, and between the second mode of discharge and the third mode of charging to achieve the effect of stabilizing the voltage.

[0180] Figure 6 For the schematic diagram of the battery risk warning device according to some embodiments of the present application, please refer to Figure 6 In the embodiments of the present application, a battery risk warning device 600 is provided, including the following modules:

[0181] The first acquisition module 610 is configured to perform the first mode of charging on the battery under test in a preset power state and acquire the first charging data of the battery under test during the first mode of charging.

[0182] The second acquisition module 620 is configured to perform the second mode of charging on the battery under test after the first mode of charging and acquire the second charging data of the battery under test during the second mode of charging.

[0183] The first determination module 630 is configured to determine the current warning value of the battery under test based on the first charging data and the second charging data.

[0184] The second determination module 640 is configured to determine that the battery under test is in a risk state in response to the current warning value and the historical warning value of the battery under test satisfying a preset warning condition.

[0185] The first acquisition module 610, the second acquisition module 620, the first determination module 630, and the second determination module 640 may respectively correspond to S110 to S140 in the battery risk warning method. For the sake of brevity, details are not described herein. It should be understood that corresponding to the embodiments of the battery risk warning method, the battery risk warning device 600 may further include more modules.

[0186] It should be noted that the functions of the various modules discussed herein can be divided into multiple modules, and / or at least some of the functions of multiple modules can be combined into a single module. The specific module performing an action includes the specific module itself performing the action, or alternatively the specific module invoking or otherwise accessing another component or module that performs the action (or performs the action in combination with the specific module). Thus, the specific module performing the action can include the specific module itself that performs the action and / or another module that the specific module invokes or otherwise accesses and that performs the action.

[0187] It should also be understood that various techniques can be described herein in the general context of software-hardware elements or program modules. The various modules described above Figure 6 can be implemented in hardware or in hardware combined with software and / or firmware. For example, these modules can be implemented as computer program code / instructions configured to be executed in one or more processors and stored in a computer-readable storage medium. Alternatively, these modules can be implemented as hardware logic / circuits. The hardware logic / circuits can include an integrated circuit chip (which includes one or more components among a processor (e.g., a Central Processing Unit (CPU), a microcontroller, a microprocessor, a Digital Signal Processor (DSP), etc.), a memory, one or more communication interfaces, and / or other circuits), and can optionally execute the received program code and / or include embedded firmware to perform functions.

[0188] Figure 7 Schematic diagram of a computing device for implementing the battery risk warning method provided in some embodiments of the present application. As Figure 7 shown, an embodiment of the present application further provides a computing device 700, including: at least one processor 705; and at least one memory 707 communicatively connected to the at least one processor 705, where the at least one memory 707 stores instructions that, when executed alone or jointly by the at least one processor 705, cause the computing device to execute the method of any one of the above embodiments.

[0189] The computing device 700 may include at least one processor 705, a memory 707, one or more communication interfaces 702, a display device 701, other input / output (I / O) devices 703, and one or more mass storage devices 706 that are capable of communicating with each other, such as via a bus 704 or other suitable connections. Instructions are stored on the memory 707, which, when executed by the processor 705, cause the processor 705 to execute the battery risk warning method as in the above embodiments.

[0190] The processor 705 may be a single processing unit or multiple processing units, and all processing units may include a single or multiple computing units or multiple cores. The processor 705 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuits, and / or any computing device that manipulates signals based on operation instructions. Among other capabilities, the processor 705 may be configured to obtain and execute computer-readable instructions stored in the memory 707, the mass storage device 706, or other computer-readable media, such as program code of an operating system 708, program code of an application 709, program code of other programs 710, etc.

[0191] The memory 707 and the mass storage device 706 are examples of computer-readable storage media for storing instructions that are executed by the processor 705 to implement the various functions described above. For example, the memory 707 generally may include both volatile and non-volatile memory (e.g., RAM, ROM, etc.). In addition, the mass storage device 706 generally may include a hard disk drive, a solid state drive, removable media, including external and removable drives, memory cards, flash memory, floppy disks, optical disks (e.g., CD, DVD), storage arrays, network-attached storage, storage area networks, etc. The memory 707 and the mass storage device 706 may both be collectively referred to herein as memory or computer-readable storage media and may be non-transitory media capable of storing computer-readable, processor-executable program instructions as computer program code that can be executed by the processor 705 as a particular machine configured to implement the operations and functions described in the examples herein.

[0192] Multiple programs may be stored on the mass storage device 706. These programs include an operating system 708, one or more application programs 709, other programs 710, and program data 711, and they may be loaded into the memory 707 for execution. Examples of such application programs or program modules may include, for example, computer program logic (e.g., computer program code or instructions) for implementing the following components / functions: the battery risk warning device 600 (including the first acquisition module 610, the second acquisition module 620, the first determination module 630, and the second determination module 640), the battery risk warning method 100 (including any suitable steps of the battery risk warning method 100), and / or additional embodiments described herein.

[0193] Although illustrated as being stored in the memory 707 of the computing device 700 in Figure 7 , the operating system 708, the application programs 709, the other programs 710, and the program data 711, or portions thereof, may be implemented using any form of computer-readable medium accessible by the computing device 700.

[0194] One or more communication interfaces 702 are used to exchange data with other computing devices, such as via a network, a direct connection, etc. Such communication interfaces may be one or more of the following: any type of network interface (e.g., network interface card (NIC)), wired or wireless (such as IEEE 802.11 wireless LAN (WLAN)) wireless interfaces, Worldwide Interoperability for Microwave Access (Wi-MAX) interfaces, Ethernet interfaces, Universal Serial Bus (USB) interfaces, cellular network interfaces, Bluetooth TM interfaces, Near Field Communication (NFC) interfaces, etc. The communication interface 702 may facilitate communication within a variety of network and protocol types, including wired networks (e.g., LAN, cable, etc.) and wireless networks (e.g., WLAN, cellular, satellite, etc.), the Internet, etc. The communication interface 702 may also provide communication with external storage devices (not shown) such as in storage arrays, network-attached storage, storage area networks, etc.

[0195] In some examples, a display device 701, such as a monitor, may be included for displaying information and images to the user. Other I / O devices 703 may be devices that receive various inputs from the user and provide various outputs to the user, and may include touch input devices, gesture input devices, cameras, keyboards, remote controls, mice, printers, audio input / output devices, etc.

[0196] The techniques described herein can be supported by these various configurations of computing device 700, including but not limited to the specific examples of the techniques described herein. For example, the functionality can also be implemented in whole or in part on a "cloud" using a distributed system. The cloud includes and / or represents a platform for resources. The platform abstracts the underlying functionality of the hardware (e.g., servers) and software resources of the cloud. Resources can include applications and / or data that can be used when performing computational processing on servers remote from computing device 700. Resources can also include services provided over the Internet and / or over a subscriber network such as a cellular or Wi-Fi network. The platform can abstract the resources and functionality to connect computing device 700 with other computing devices. Thus, the implementation of the functionality described herein can be distributed throughout the cloud. For example, the functionality can be implemented in part on computing device 700 and in part through a platform that abstracts the functionality of the cloud.

[0197] An embodiment of the present application also provides a computer-readable storage medium having instructions stored thereon that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to perform the method in any of the above embodiments.

[0198] Computer-readable storage media include volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVDs), or other optical storage devices, magnetic cassettes, magnetic tapes, magnetic disk storage devices, or other magnetic storage devices, or any other non-transitory media that can be used to store information for access by a computing device.

[0199] An embodiment of the present application provides a computer program product including instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to perform the method in any of the above embodiments.

[0200] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other objects, features, and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below.

[0201] An embodiment of the present application provides a battery risk warning method 100, which can be used in various battery tests. Among them, the battery to be tested can be a square shell battery, a cylindrical battery, a laminated battery, a soft-pack battery, etc. according to the battery type, and the battery to be tested can be a lithium iron phosphate battery, a ternary battery, a solid-state battery, etc. according to the battery material system.

[0202] Considering that hundreds of cycle tests can be carried out in about 10 days for cycle tests, and the risk of cycle life can be obtained quickly. However, for storage tests (calendar life tests), it takes more than 100 days of storage to possibly obtain the results. Therefore, in view of the problem that the evaluation period of storage calendar aging (calendar life) is too long, taking the storage test as an example, the method will be introduced. The risk warning method may include the following steps:

[0203] 1. Take the battery to be tested and adjust the battery to be tested to a specified power, generally adjusted to a state close to full charge. For example, 1C CC Vmax is adopted (high SOC can accelerate calendar aging).

[0204] 2. Store it at a high temperature for a certain period of time, generally 15 days are selected (high temperature can accelerate calendar aging).

[0205] 3. Perform standard test steps to obtain the discharge capacity value and the first-level risk warning value.

[0206] Among them, the standard test steps may include:

[0207] 1) Stand still for 5 min.

[0208] 2) 0.33Cn DC Vmin (discharge in the first mode), that is, perform constant current discharge at 0.33 times Cn until the voltage drops to Vmin. It can be understood that the discharge can be carried out below 50% power. Here, the well-known cut-off lower limit is used for cut-off, that is, the power corresponding to Vmin is 0%.

[0209] 3) Stand still for 5 min.

[0210] 4) 0.33Cn CC Vmax (charge in the first mode), perform constant current charging at 0.33 times Cn. When the battery voltage reaches the set maximum voltage Vmax, stop constant current charging. Here, Vmax is the well-known voltage upper limit. For the LFP (lithium iron phosphate) system, Vmax is 3.65 - 3.8V, and for the ternary system, Vmax is 4.2 - 4.4V.

[0211] 5) Vmax CV 0.04Cn (charge in the second mode), perform constant voltage charging, and the charging current gradually decreases until the cut-off current reaches 0.04Cn and then terminates.

[0212] 6) Stand still for 5 min.

[0213] 7) 0.33Cn DC Vmin (discharge in the second mode), perform constant current discharge at 0.33 times Cn until the voltage drops to Vmin. The purpose is to obtain the current remaining capacity of the battery to be tested after reaching the full charge state.

[0214] 8) Stand still for 5 min.

[0215] 9) 0.33Cn CC Vmax (Third - mode charging): Constant - current charging is carried out at 0.33 times of Cn. When the battery voltage reaches the set maximum voltage Vmax, the constant - current charging stops. The purpose is to regulate the SOC of the battery under test for aging, and generally, a state close to full charge (90% - 100% SOC) is selected.

[0216] 4. Store at high temperature for 15 days, and repeat steps 1) to 9) in the standard test until the capacity decays to a preset state (e.g., 60% SOH) or reaches the total test duration (e.g., 200 days or 500 days, etc.).

[0217] It can be understood that in the first - round test before storage in some embodiments, the Cn value can be taken as the rated capacity value (for example, if the rated capacity of the battery cell is 100 Ah, then the Cn value is calculated according to 100 Ah). Then, in step 7), the current remaining capacity (e.g., 99 Ah) is obtained. The Cn value for the second - round test can be calculated using this current remaining capacity (calculated according to 99 Ah), and the Cn value for each subsequent time is iterated according to the test value in step 7) of the previous round.

[0218] In some other embodiments, Cn can use a fixed value (preset capacity value), such as directly using the rated capacity value, or the remaining capacity obtained from the first - round test, etc.

[0219] In addition, it can be understood that steps 1) to 5) can be used in various types of tests, such as cycle tests or storage tests, etc. Steps 6) to 9) are illustrated by taking the storage test as an example.

[0220] During the process of performing the above - mentioned test steps, the data of the voltage and capacity changing with the charging time in step 4) can be recorded, and the differential voltage curve dV / dQ can be calculated.

[0221] Combined Figure 2 and Figure 3 , when the battery under test is being charged, approximately in the SOC range of 50% - 65% (the first preset state - of - charge range), there will be a phase - transition peak of graphite from the LiC12 phase to the LiC6 phase. The time point corresponding to this peak value is taken as the first time (the first peak moment) T1.

[0222] The time point corresponding to the end of CC charging in step 4) is taken as the second time (the first charging end moment) T2.

[0223] The time point at the end of CV constant - voltage charging in step 5) is recorded as the third time (the second charging end moment) T3.

[0224] Calculate the first charge: The first charge charged at a constant current from T1 to T2 , where The charging current for charging in the first mode.

[0225] Calculate the second charge: The second charge charged during the constant voltage stage from T2 to T3 , where is the charging current for charging in the second mode.

[0226] The warning value of calendar life Calculate: .

[0227] It can be understood that when problems such as lithium plating occur in the battery cells, since the lithium intercalation process changes from only intercalating lithium into graphite to intercalating lithium into graphite and depositing lithium metal, with an additional lithium plating process, it will cause the Q2 value to increase and the Q1 value to decrease, and the warning value shows an obvious decrease.

[0228] Combined with Figure 4 and Figure 5 , in this embodiment, two sets of battery cells are used as a control group, and two parallel sample battery cells are used in each group. The battery cells in the first group (the black curve in the figure) can be normal battery cells. For comparison, the second group (the gray curve in the figure) can be abnormal battery cells (i.e., battery cells expected to have calendar life risks) made by replacing electrode materials, etc.

[0229] To accurately verify the method provided in this embodiment, the calendar life test method is respectively used to test the calendar life of the two sets of battery cells, that is, the battery is stored at a specific temperature for a period of time, and then the remaining capacity is tested, and the above storage and remaining capacity tests are repeated until the battery capacity decays to a preset state, so as to obtain Figure 4 the calendar life decay curve of Figure 4 , that is, the relationship curve between the capacity retention rate of the battery cell and the storage days. It can be seen from

[0230] that for the second group of battery cells, when stored for about 100 days, the remaining capacity shows an obvious decrease. Figure 5 In

[0231] , through the warning value, it is found that for the second group of battery cells, the warning value has already shown a slight decrease during the second round of testing, and during the third round of testing, an obvious lithium plating signal appears (i.e., the curve shows an obvious decrease), and at the same time, for the first group of battery cells, a lithium plating signal also appears at about 120 days.

[0232] First-level warning state: The warning value decreases for the first time.

[0233] Second-level warning state: The warning value decreases continuously twice, and the decrease amplitude becomes larger.

[0234] Three - level warning state: The warning value drops three times in a row, and the drop amplitude gradually becomes larger.

[0235] In addition, it can be understood that Figure 5 in [a certain context], through the three - level warning mechanism, for the second group of battery cells, when an obvious lithium plating signal appears (i.e., in the risk state), the time is about 45 days. That is, it only takes about 45 days to confirm that there is a risk in this battery cell, while Figure 4 in [a certain context], if the capacity retention rate is used to judge whether there is a risk, it takes at least about 100 days. Thus, it can be seen that this method can provide a warning method for quickly determining whether the battery has a calendar life risk. The required test cycle is only about one month. For the battery cells that pass the evaluation, they can be released to the client, while the batteries with risks can be intercepted in time for further improvement, shortening the calendar life test time.

[0236] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery risk warning method, characterized in that, Including: Charging a battery under test with a preset power level in a first mode, and obtaining first charging data of the battery under test during the first-mode charging; Charging the battery under test after the first-mode charging in a second mode, and obtaining second charging data of the battery under test during the second-mode charging; Based on the first charging data and the second charging data, determining a current warning value of the battery under test; In response to the current warning value and a historical warning value of the battery under test satisfying a preset warning condition, determining that the battery under test is in a risk state; Wherein, the determining the current warning value of the battery under test based on the first charging data and the second charging data includes: Based on the first charging data, determining a differential voltage curve of the battery under test; Based on the differential voltage curve, determining a first peak time, where the first peak time is used to represent the peak time when a phase transition occurs in the negative electrode material of the battery under test; Based on the first peak time, the first charging data, and the second charging data, determining the current warning value of the battery under test; Further, the determining the current warning value of the battery under test based on the first peak time, the first charging data, and the second charging data includes: Based on the first charging data, determining a first charge amount charged by the battery under test from the first peak time to the end time of the first-mode charging; Based on the second charging data, determining a second charge amount charged by the battery under test from the end time of the first charging to the end time of the second-mode charging; Determining a ratio of the first charge amount to the second charge amount as the current warning value of the battery under test, where the current warning value is used to determine whether the battery under test has a calendar life risk.

2. The method according to claim 1, wherein The charging the battery under test with a preset power level in the first mode includes: Based on a first charging rate, performing constant-current charging on the battery under test with a preset power level until the voltage of the battery under test reaches a maximum voltage; Among them, the first charging rate A1 satisfies: 0.1Cn A1 Cn is a preset capacity value or the remaining capacity measured for the battery under test during the determination of the previous warning value.

3. The method according to claim 1, wherein The charging the battery under test after the first-mode charging in the second mode includes: Performing constant-voltage charging on the battery under test after the first-mode charging until the current of the battery under test reaches a cut-off current; Among them, the cut-off current B satisfies , where Cn is a preset capacity value or the remaining capacity measured for the battery under test during the determination of the previous warning value.

4. The method according to claim 1, wherein The determining the first peak time based on the differential voltage curve includes: Determine the occurrence time of the peak value within the first preset state of charge range in the differential voltage curve as the first peak time, where the first preset state of charge range SOC1 satisfies: 50% SOC1 .

5. The method according to claim 1, wherein The determining that the battery under test is in a risk state in response to the current warning value and a historical warning value of the battery under test satisfying a preset warning condition includes: Based on the current warning value and the historical warning value of the battery under test, determining a warning data set, where the warning data set includes each warning value of the battery under test determined in chronological order; In response to the warning data set continuously showing a decrease in the warning value and the amplitude of the decrease in the warning value increasing sequentially, determining that the battery under test is in a risk state.

6. The method according to claim 5, wherein The determining that the battery under test is in a risk state in response to the warning data set continuously showing a decrease in the warning value and the amplitude of the decrease in the warning value increasing sequentially includes: In response to the first occurrence of a decrease in the warning value in the warning data set and the decrease amplitude of the warning value satisfying a first threshold, it is determined that the battery under test is in a first-level warning state; In response to the warning value in the warning data set decreasing continuously twice and the decrease amplitude of the warning value increasing successively, it is determined that the battery under test is in a second-level warning state; In response to the warning value in the warning data set decreasing continuously three times and the decrease amplitude of the warning value increasing successively, it is determined that the battery under test is in a third-level warning state, where the third-level warning state is used to characterize that the battery under test is in a risk state.

7. The method according to any one of claims 1 to 6, characterized in that The method further includes: Performing a first-mode discharge on the battery under test until the power of the battery under test reaches the preset power; Among them, the preset power E satisfies that 0.5E0, where E0 is the rated power of the battery to be measured.

8. The method according to claim 7, wherein The performing a first-mode discharge on the battery under test includes: Performing a constant-current discharge on the battery under test based on a first discharge rate; Among them, the first discharge rate D1 satisfies: D1 , where Cn is a preset capacity value or the remaining capacity measured for the battery under test during the determination process of the previous warning value.

9. The method according to any one of claims 1-6, characterized in that, The method further includes: In response to the current warning value and the historical warning value of the battery under test not satisfying the preset warning condition, determining the current remaining capacity of the battery under test; In response to the current remaining capacity not decaying to a preset state or the total test duration of the battery under test not reaching a preset duration, performing high-temperature storage on the battery under test; Executing the determination process of the next warning value of the battery under test.

10. The method according to claim 9, characterized in that The determining the current remaining capacity of the battery under test includes: Performing a second-mode discharge on the battery under test until the voltage of the battery under test reaches the minimum voltage, and obtaining first discharge data of the battery under test during the second-mode discharge; Based on the first discharge data, determining the current remaining capacity of the battery under test.

11. The method according to claim 10, wherein The performing a second-mode discharge on the battery under test includes: Performing a constant-current discharge on the battery under test based on a second discharge rate; Among them, the second discharge rate D2 satisfies: 0 D2 , where Cn is a preset capacity value or the remaining capacity measured during the determination of the previous warning value of the battery under test.

12. The method according to claim 10, characterized in that, After performing the second-mode discharge on the battery under test until the power of the battery under test reaches the minimum voltage, the method further includes: Performing a third-mode charge on the battery under test until the battery under test reaches a second preset state of charge; Among them, the second preset state of charge SOC2 satisfies: 90% SOC2 .

13. The method according to claim 12, wherein The performing a third-mode charge on the battery under test includes: Performing a constant-current charge on the battery under test based on a second charge rate; Among them, the second charging rate A2 satisfies: 0 A2 Cn is a preset capacity value or the remaining capacity measured for the battery under test during the determination process of the previous warning value.

14. A battery risk warning device, characterized in that, Includes: A first acquisition module, configured to perform a first-mode charge on a battery under test at a preset power and acquire first charge data of the battery under test during the first-mode charge; A second acquisition module, configured to perform a second-mode charge on the battery under test after the first-mode charge and acquire second charge data of the battery under test during the second-mode charge; A first determination module, configured to determine the current warning value of the battery under test based on the first charge data and the second charge data; A second determination module, configured to determine that the battery under test is in a risk state in response to the current warning value and the historical warning value of the battery under test satisfying a preset warning condition; Wherein, the first determination module is further configured to determine a differential voltage curve of the battery under test based on the first charging data; determine a first peak time based on the differential voltage curve, where the first peak time is used to characterize the peak time when the negative electrode material of the battery under test undergoes a phase transition; determine a current warning value of the battery under test based on the first peak time, the first charging data, and the second charging data; the first determination module is further configured to determine a first amount of charge input to the battery under test from the first peak time to the first charging end time of the first mode of charging based on the first charging data; determine a second amount of charge input to the battery under test from the first charging end time to the second charging end time of the second mode of charging based on the second charging data; determine the ratio of the first amount of charge to the second amount of charge as the current warning value of the battery under test, and the current warning value is used to determine whether the battery under test has a calendar life risk.

15. A computing device, characterized in that, Comprising: At least one processor; And At least one memory communicatively coupled to the at least one processor, the at least one memory storing instructions that, when executed alone or jointly by the at least one processor, cause the computing device to perform the method of any one of claims 1 to 13.

16. A computer-readable storage medium, characterized in that, Storing instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to perform the method of any one of claims 1 to 13.

17. A computer program product, characterized in that, Including instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to perform the method of any one of claims 1 to 13.

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