Battery System Abnormal Risk Warning Method, Device and Related Equipment

Abstract

The present application provides a method, device and related equipment for warning of abnormal risks of a battery system. By obtaining the first discharge system internal resistance and the first charge system internal resistance of the battery system in a first state; obtaining first operation data within a first preset time period after the discharge current of the battery system in a second state reaches a plurality of preset first current thresholds respectively; obtaining second operation data within a second preset time period after the charge current of the battery system in a third state reaches a plurality of preset second current thresholds respectively; determining the second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operation data, and determining the second charge system internal resistance of the battery system based on the plurality of second current thresholds and the second operation data; warning of abnormal risks of the battery system based on the above-mentioned plurality of system internal resistance data. Real-time detection of the internal resistance of the battery system is achieved and the use safety of the battery system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery systems, and in particular, to a method and device for warning of abnormal risks of a battery system and related equipment. Background Art

[0002] With the popularization of electric vehicles, the battery safety problem of electric vehicles has received more and more attention. The power batteries used in electric vehicles generally use a large number of single cells in series and parallel combinations to meet the capacity and voltage requirements. During battery operation, due to the production inconsistency of single cells and the inconsistency of usage conditions, some single cells or parallel modules have faults such as undervoltage / low capacity / large self-discharge / high internal resistance during operation. These faults make the voltage data of the single cell or module during operation significantly different from that of other single cells or modules, causing the battery pack to fail to perform its due performance and affecting the normal use of the battery pack.

[0003] However, conventional electric vehicles only have the BOL (Beginning of Life) information of the internal resistance of the battery cells, lack the internal resistance information of the battery system, and the battery system may also have abnormal conditions. The existing warning of abnormal risks of the battery system is not efficient and accurate enough.

[0004] Therefore, how to efficiently and accurately warn of abnormal risks of the battery system is a technical problem that urgently needs to be solved in the current technical field of battery systems. Summary of the Invention

[0005] The present application provides a method and device for warning of abnormal risks of a battery system and related equipment, aiming to solve the technical problem of how to efficiently and accurately warn of abnormal risks of the battery system.

[0006] In a first aspect, the present application provides a method for warning of abnormal risks of a battery system, the method comprising:

[0007] Obtaining a first discharge system internal resistance and a first charge system internal resistance of the battery system in a first state, where the first state is the state of performing a BOL test before loading the vehicle;

[0008] Obtaining first operation data of the battery system within a first preset time period after the discharge current of the battery system in a second state reaches a plurality of preset first current thresholds, where the second state is the state of performing discharge operation after loading the vehicle;

[0009] Obtaining second operation data of the battery system within a second preset time period after the charge current of the battery system in a third state reaches a plurality of preset second current thresholds, where the third state is the state of performing kinetic energy recovery after loading the vehicle;

[0010] Determine the internal resistance of the second discharge system of the battery system based on the multiple first current thresholds and the first operating data, and determine the internal resistance of the second charging system of the battery system based on the multiple second current thresholds and the second operating data;

[0011] the internal resistance of the second charging system of the battery system;

[0012] Based on the internal resistance of the first discharge system, the internal resistance of the first charging system, the internal resistance of the second discharge system, and the internal resistance of the second charging system, give an early warning of the abnormal risk of the battery system.

[0013] In one embodiment, the giving an early warning of the abnormal risk of the battery system based on the internal resistance of the first discharge system, the internal resistance of the first charging system, the internal resistance of the second discharge system, and the internal resistance of the second charging system includes:

[0014] including:

[0015] Subtract the internal resistance of the second discharge system from the internal resistance of the first discharge system to obtain a difference in the internal resistance of the discharge system;

[0016] Subtract the internal resistance of the second charging system from the internal resistance of the first charging system to obtain a difference in the internal resistance of the charging system;

[0017] Based on the difference in the internal resistance of the discharge system and the difference in the internal resistance of the charging system, give an early warning of the abnormal risk of the battery system.

[0018] In one embodiment, the giving an early warning of the abnormal risk of the battery system based on the difference in the internal resistance of the discharge system and the difference in the internal resistance of the charging system includes:

[0019] including: Compare the difference in the internal resistance of the discharge system with a preset first difference threshold to obtain a first comparison result;

[0020] result;

[0021] Compare the difference in the internal resistance of the charging system with a preset second difference threshold to obtain a second comparison result;

[0022] If the first comparison result is that the difference in the internal resistance of the discharge system is greater than the first difference threshold, and / or the second comparison result is that the difference in the internal resistance of the charging system is greater than the second difference threshold, then give an early warning of the abnormal risk of the battery system.

[0023] the abnormal risk of the battery system.

[0024] In one embodiment, the first operating data includes multiple first voltage values corresponding to each of the first current thresholds;

[0025] Determining the second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operating data includes:

[0026] Based on each of the first current thresholds and a plurality of first voltage values corresponding to each of the first current thresholds, determining a target system internal resistance of the battery system at each of the first current thresholds;

[0027] Calculating a first average value of the target system internal resistances at all the first current thresholds, and using the first average value as the second discharge system internal resistance of the battery system.

[0028] In one embodiment, the plurality of first voltage values include a first starting voltage value and a plurality of first ending voltage values within the first preset time period;

[0029] The determining the target system internal resistance of the battery system at each of the first current thresholds based on each of the first current thresholds and the plurality of first voltage values corresponding to each of the first current thresholds includes:

[0030] Subtracting each of the first ending voltage values from the first starting voltage value respectively to obtain a plurality of first voltage differences;

[0031] Dividing each of the first voltage differences by its corresponding first current threshold respectively to obtain a plurality of first target internal resistance values;

[0032] Calculating a second average value of all the first target internal resistance values, and using the second average value as the target system internal resistance of the battery system at each of the first current thresholds.

[0033] In one embodiment, the second operating data includes a plurality of second voltage values corresponding to each of the second current thresholds;

[0034] The determining the second charge system internal resistance of the battery system based on the plurality of second current thresholds and the second operating data includes:

[0035] Based on each of the second current thresholds and a plurality of second voltage values corresponding to each of the second current thresholds, determining a target system internal resistance of the battery system at each of the second current thresholds;

[0036] Calculating a second average value of the target system internal resistances at all the second current thresholds, and using the second average value as the second charge system internal resistance of the battery system.

[0037] In one embodiment, the plurality of second voltage values include a second starting voltage value and a plurality of second ending voltage values within the second preset time period;

[0038] Determining the target system internal resistance of the battery system at each of the second current thresholds based on each of the second current thresholds and a plurality of second voltage values corresponding to each of the second current thresholds includes:

[0039] Subtracting each of the second end voltage values from the second start voltage value respectively to obtain a plurality of second voltage differences;

[0040] Dividing each of the second voltage differences by its corresponding second current threshold respectively to obtain a plurality of second target internal resistance values;

[0041] Calculating a third average value of all the second target internal resistance values, and taking the third average value as the target system internal resistance of the battery system at each of the second current thresholds.

[0042] In a second aspect, the present application provides a battery system abnormal risk warning device, and the device includes:

[0043] A first acquisition unit, configured to acquire a first discharge system internal resistance and a first charge system internal resistance of the battery system in a first state, where the first state is the state of performing a BOL test before loading the vehicle;

[0044] A second acquisition unit, configured to acquire first operation data of the battery system within a first preset time period after the discharge current of the battery system in a second state reaches a plurality of preset first current thresholds respectively, where the second state is the state of performing discharge operation after loading the vehicle;

[0045] A third acquisition unit, configured to acquire second operation data of the battery system within a second preset time period after the charge current of the battery system in a third state reaches a plurality of preset second current thresholds respectively, where the third state is the state of performing kinetic energy recovery after loading the vehicle;

[0046] A first determination unit and a second determination unit, configured to determine a second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operation data, and determine a second charge system internal resistance of the battery system based on the plurality of second current thresholds and the second operation data;

[0047] A first warning unit, configured to perform an abnormal risk warning on the battery system based on the first discharge system internal resistance, the first charge system internal resistance, the second discharge system internal resistance, and the second charge system internal resistance.

[0048] In an embodiment, the first warning unit specifically includes:

[0049] A first calculation unit, configured to subtract the second discharge system internal resistance from the first discharge system internal resistance to obtain a discharge system internal resistance difference;

[0050] A second calculation unit, configured to subtract the internal resistance of the first charging system from the internal resistance of the second charging system to obtain a difference in the internal resistance of the charging system;

[0051] A second warning unit, configured to warn of an abnormal risk of the battery system based on the difference in the internal resistance of the discharge system and the difference in the internal resistance of the charging system.

[0052] In one embodiment, the warning of the abnormal risk of the battery system based on the difference in the internal resistance of the discharge system and the difference in the internal resistance of the charging system is specifically configured to:

[0053] Compare the difference in the internal resistance of the discharge system with a preset first difference threshold to obtain a first comparison result;

[0054] Compare the difference in the internal resistance of the charging system with a preset second difference threshold to obtain a second comparison result;

[0055] If the first comparison result is that the difference in the internal resistance of the discharge system is greater than the first difference threshold, and / or the second comparison result is that the difference in the internal resistance of the charging system is greater than the second difference threshold, then a warning is given for the abnormal risk of the battery system.

[0056] In one embodiment, the first operating data includes a plurality of first voltage values corresponding to the respective first current thresholds;

[0057] The first determination unit specifically includes:

[0058] A third determination unit, configured to determine a target system internal resistance of the battery system at each of the first current thresholds based on the respective first current thresholds and the plurality of first voltage values corresponding to the respective first current thresholds;

[0059] A third calculation unit, configured to calculate a first average value of the target system internal resistances at all the first current thresholds, and use the first average value as the second discharge system internal resistance of the battery system.

[0060] In one embodiment, the plurality of first voltage values include a first starting voltage value and a plurality of first ending voltage values within the first preset time period;

[0061] The third determination unit is specifically configured to:

[0062] Subtract the respective first ending voltage values from the first starting voltage value to obtain a plurality of first voltage differences;

[0063] Divide each of the first voltage differences by its corresponding first current threshold to obtain a plurality of first target internal resistance values;

[0064] Calculate a second average value of all the first target internal resistance values, and use the second average value as the target system internal resistance of the battery system at each of the first current thresholds.

[0065] In one embodiment, the second operating data includes a plurality of second voltage values corresponding to each of the second current thresholds;

[0066] The second determining unit specifically includes:

[0067] A fourth determining unit, configured to determine the target system internal resistance of the battery system at each of the second current thresholds based on each of the second current thresholds and the plurality of second voltage values corresponding to each of the second current thresholds;

[0068] A fourth calculating unit, configured to calculate a second average value of the target system internal resistances at all the second current thresholds, and use the second average value as the second charging system internal resistance of the battery system.

[0069] In one embodiment, the plurality of second voltage values includes a second starting voltage value and a plurality of second ending voltage values within the second preset time period;

[0070] The fourth determining unit is specifically configured to:

[0071] Subtract each of the second ending voltage values from the second starting voltage value respectively to obtain a plurality of second voltage differences;

[0072] Divide each of the second voltage differences by its corresponding second current threshold respectively to obtain a plurality of second target internal resistance values;

[0073] Calculate a third average value of all the second target internal resistance values, and use the third average value as the target system internal resistance of the battery system at each of the second current thresholds.

[0074] In a third aspect, the present application further provides an electronic device, where the electronic device includes:

[0075] One or more processors;

[0076] A memory; and

[0077] One or more applications, where the one or more applications are stored in the memory and configured to be executed by the processor to implement the battery system abnormal risk warning method as described above.

[0078] In a fourth aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, and the computer program is loaded by a processor to execute the steps in the battery system abnormal risk warning method as described above.

[0079] In an embodiment of the present application, the first discharge system internal resistance and the first charge system internal resistance of a battery system in a first state are obtained, where the first state is the state of performing a BOL test before vehicle installation; the first operation data within a first preset time period after the discharge current of the battery system in a second state reaches a plurality of preset first current thresholds is obtained, where the second state is the state of performing discharge operation after vehicle installation; the second operation data within a second preset time period after the charge current of the battery system in a third state reaches a plurality of preset second current thresholds is obtained, where the third state is the state of performing kinetic energy recovery after vehicle installation; based on the plurality of first current thresholds and the first operation data, the second discharge system internal resistance of the battery system is determined, and based on the plurality of second current thresholds and the second operation data, the second charge system internal resistance of the battery system is determined; based on the first discharge system internal resistance, the first charge system internal resistance, the second discharge system internal resistance, and the second charge system internal resistance, an early warning of the abnormal risk of the battery system is given. Compared with the traditional method, by obtaining the system internal resistance data of the battery system in multiple different states and performing analysis, the current actual internal resistance of the battery system can be calculated efficiently and accurately, realizing real-time detection of the internal resistance of the battery system without adding any cost; at the same time, an additional detection method for the safety of the battery system is added to improve the use safety of the battery system; and through the early warning function, the after-sales maintenance cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings without creative efforts based on these drawings.

[0081] Figure 1 is a schematic diagram of the scenario of the battery system abnormal risk early warning system provided by the embodiment of the present application;

[0082] Figure 2 is a schematic flowchart of an embodiment of the battery system abnormal risk early warning method provided by the embodiment of the present application;

[0083] Figure 3 is a schematic structural diagram of an embodiment of the battery system abnormal risk early warning device provided by the embodiment of the present application;

[0084] Figure 4 is a schematic structural diagram of an embodiment of the electronic device provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0085] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0086] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present 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, and thus cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0087] In the present application, the term "exemplary" is used to mean "serving as an example, illustration, or description". Any embodiment described as "exemplary" in the present application is not necessarily to be construed as more preferred or more advantageous than other embodiments. In order for any person skilled in the art to implement and use the present application, the following description is given. In the following description, details are set forth for the purpose of explanation. It should be understood that those of ordinary skill in the art can recognize that the present application can be implemented without these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid unnecessary details from obscuring the description of the present application. Therefore, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in the present application.

[0088] The embodiments of the present application provide a method, device, and related equipment for warning of abnormal risks in a battery system, which will be described in detail below.

[0089] As Figure 1 shown, Figure 1 is a schematic diagram of the scenario of the battery system abnormal risk warning system provided by the embodiments of the present application. The battery system abnormal risk warning system may include an electronic device 100, and a battery system abnormal risk warning device is integrated in the electronic device 100, such as Figure 1 the electronic device 100 in

[0090] In an embodiment of the present application, the electronic device 100 is mainly used to obtain the first discharge system internal resistance and the first charge system internal resistance of the battery system in a first state, where the first state is the state of performing a BOL test before loading; obtain the first operating data within a first preset time period after the discharge current of the battery system in a second state reaches a plurality of preset first current thresholds respectively, where the second state is the state of performing discharge operation after loading; obtain the second operating data within a second preset time period after the charge current of the battery system in a third state reaches a plurality of preset second current thresholds respectively, where the third state is the state of performing kinetic energy recovery after loading; determine the second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operating data, and determine the second charge system internal resistance of the battery system based on the plurality of second current thresholds and the second operating data; and give an early warning of the abnormal risk of the battery system based on the first discharge system internal resistance, the first charge system internal resistance, the second discharge system internal resistance, and the second charge system internal resistance.

[0091] In an embodiment of the present application, the electronic device 100 may be a terminal or a server. When the electronic device 100 is a server, it may be an independent server or a server network or server cluster composed of servers. For example, the electronic device 100 described in the embodiment of the present application includes, but is not limited to, a computer, a network host, a single network server, a set of multiple network servers, or multiple servers to construct a cloud server. Among them, the cloud server is constructed by a large number of computers or network servers based on cloud computing (Cloud Computing).

[0092] It can be understood that when the electronic device 100 in the embodiment of the present application is a terminal, the used terminal may be a device that includes both receiving and transmitting hardware, that is, a device having receiving and transmitting hardware capable of performing two-way communication on a two-way communication link. Such a device may include: a cellular or other communication device, which has a single-line display or a multi-line display or a cellular or other communication device without a multi-line display. Specifically, the electronic device 100 may specifically be a desktop terminal or a mobile terminal, and the electronic device 100 may specifically also be a mobile phone, a tablet computer, a laptop computer, a battery system (Battery Management System, BMS)

[0093] or the like.

[0094] Those skilled in the art can understand that Figure 1 the application environment shown is only an application scenario of the present application solution, and does not limit the application scenario of the present application solution. Other application environments may also include more Figure 1More or fewer electronic devices shown in, for example Figure 1 Only 1 electronic device is shown in. It can be understood that the battery system abnormal risk warning system may further include one or more other electronic devices, which are not specifically limited here.

[0095] 5In addition, as Figure 1 shown, the battery system abnormal risk warning system may further include a memory 200,

[0096] for storing data, such as storing the first discharge system internal resistance and the first charge system internal resistance of the battery system in the first state and the battery system abnormal risk warning data, such as the battery system abnormal risk warning data when the battery system abnormal risk warning system is running.

[0097] It should be noted that Figure 1 The scenario schematic diagram of the battery system abnormal risk warning system shown is only an example. The battery system abnormal risk warning system and the scenario described in the embodiments of the present application are for more clearly explaining the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those of ordinary skill in the art know that with the evolution of the battery system abnormal risk warning system and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0098] 5Next, the battery system abnormal risk warning method provided by the embodiments of the present application is introduced.

[0099] In the embodiments of the battery system abnormal risk warning method of the present application, the battery system abnormal risk warning device is used as the execution subject. For the sake of simplicity and convenience of description, the execution subject will be omitted in the subsequent method embodiments. The battery system abnormal risk warning device is applied to an electronic device. The method includes: obtaining the first discharge system internal resistance and the first charge system internal resistance of the battery system in the first state, where the first state is the state of performing a BOL test before loading; obtaining the first operation data within a first preset time period after the discharge current of the battery system in the second state reaches a plurality of preset first current thresholds respectively, where the second state is the state of performing discharge operation after loading; obtaining the second operation data within a second preset time period after the charge current of the battery system in the third state reaches a plurality of preset second current thresholds respectively, where the third state is the state of performing kinetic energy recovery after loading; determining the second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operation data, and determining the second charge system internal resistance of the battery system based on the plurality of second current thresholds and the second operation data; warning of the abnormal risk of the battery system based on the first discharge system internal resistance, the first charge system internal resistance, the second discharge system internal resistance, and the second charge system internal resistance.

[0100] Please refer to Figures 2 to 4 , Figure 2 which is a schematic flowchart of an embodiment of the battery system abnormal risk warning method provided in the embodiment of the present application. The battery system abnormal risk warning method may specifically include the following steps 201 to 205:

[0101] 201. Obtain the first discharge system internal resistance and the first charge system internal resistance of the battery system in the first state.

[0102] Among them, the first state is the state of performing BOL test before loading the vehicle. The BOL test, that is, a comprehensive physical examination of the battery at the initial stage of its life, mainly includes the following tests: capacity test, hybrid pulse power performance test, rate performance test, self-discharge test, etc.

[0103] Among them, the battery system (or battery management system) (Battery Management System, BMS) is also called battery nanny or battery butler. Its main purpose is to intelligently manage and maintain each battery unit, prevent the battery from overcharging and over-discharging, extend the service life of the battery, and monitor the state of the battery. The BMS battery management system unit includes a BMS battery management system, a control module, a display module, a wireless communication module, electrical equipment, a battery pack for supplying power to the electrical equipment, and a collection module for collecting battery information of the battery pack. The BMS battery management system is respectively connected to the wireless communication module and the display module through a communication interface. The output end of the collection module is connected to the input end of the BMS battery management system. The output end of the BMS battery management system is connected to the input end of the control module. The control module is respectively connected to the battery pack and the electrical equipment. The BMS battery management system is connected to the Server server through a wireless communication module.

[0104] Exemplarily, the first discharge system internal resistance and the first charge internal resistance of the battery system generated during the BOL test can be recorded, and then the recorded data can be recorded into the BMS program, so as to obtain the first discharge system internal resistance and the first charge system internal resistance of the battery system in the first state.

[0105] It should be noted that the battery system in the embodiment of the present application can be used in electric vehicles, electric trains, electric bicycles, etc. The battery used to provide power in an electric vehicle is also called a power battery. A power battery is a power source that provides power for a tool, and mostly refers to a storage battery that provides power for electric vehicles, electric trains, electric bicycles, and golf carts.

[0106] 202. Obtain the first operation data within a first preset time period after the discharge current of the battery system in the second state reaches a plurality of preset first current thresholds respectively.

[0107] Among them, the second state is the state of discharging operation after loading. After loading means that the battery system has been installed, and the state of the vehicle is the state where it can drive normally on the road; discharging operation means the state of the vehicle driving with electricity, which can specifically be only using electrical equipment on the vehicle, such as air conditioners, windshield wipers, etc., or it can also be a moving state of driving at a constant speed or accelerating.

[0108] Among them, multiple first current thresholds are preset. The number of the first current thresholds can be set according to actual needs. In the embodiment of the present application, three first current thresholds are preferably set. Further, the magnitudes of the multiple first current thresholds can be set according to actual needs. In the present application, the magnitudes of the first current thresholds are preferably set as the gradient occupancy ratios of the rated capacities of multiple battery systems. For example, assuming that there are three first current thresholds, these three first current thresholds are I1 = 0.3C, I2 = 0.5C, and I3 = 1C (where C is the rated capacity of the battery system).

[0109] It can be understood that the first current threshold is a trigger condition. When the vehicle is running, its discharge current will change according to its running conditions. During the change process, it may trigger the corresponding first current threshold. At this time, the electronic device will obtain the first operation data within the first preset time period after triggering the first current threshold.

[0110] Among them, the first preset time period can be set according to actual needs. In the embodiment of the present application, it is preferably 3 to 5 seconds. In this way, it can avoid errors caused by large data change differences due to too long time, and can also avoid unstable obtained data due to too short time.

[0111] Specifically, the first operation data may include multiple first voltage values corresponding to each of the first current thresholds.

[0112] It can be understood that during the running of the vehicle, due to various reasons, the current magnitude will not be the same within a period of time, but will change, and its voltage data is also changing. Therefore, after triggering a certain first current threshold, multiple first voltage values within the first preset time period can be obtained.

[0113] 203. Obtain the second operation data within the second preset time period after the charging current of the battery system in the third state reaches multiple preset second current thresholds respectively.

[0114] Among them, the third state is the state of kinetic energy recovery after loading. Similarly, after loading means that the battery system has been installed and the vehicle is in a state where it can drive normally on the road; kinetic energy recovery means that when the driver needs to decelerate during the running of the vehicle, the kinetic energy of the vehicle can be recovered and converted into electrical energy. For the convenience of understanding, its principle is to obtain the signal of the brake pedal, and the VCU comprehensively judges whether to start the kinetic energy recovery function. When the vehicle starts to slide, due to inertia, although the motor itself has no power consumption, it is still rotating. The stator continuously cuts the magnetic induction line, that is, according to the principle of electromagnetic induction, magnetic electricity is generated, and then the generated electricity is transmitted back to the battery. Whether the stator is dragged due to inertia or starts to reverse at the critical point, the torque it generates is negative for the vehicle, that is, the motor can directly provide braking force for the vehicle to achieve braking; it should be noted that the current generated during kinetic energy recovery is the feedback current.

[0115] Among them, multiple second current thresholds are preset, and the number of the second current thresholds can be set according to actual needs. In the embodiment of the present application, three second current thresholds are preferably set. Further, the magnitudes of the multiple second current thresholds can be set according to actual needs. In the present application, the magnitudes of the second current thresholds are preferably set as the gradient occupancy ratios of the rated capacities of multiple battery systems. For example, assuming that there are three second current thresholds, the three first current thresholds are I1 = -0.3C, I2 = -0.5C, and I3 = -1C (where C is the rated capacity of the battery system). Here, the negative value indicates the feedback current, and the positive value in step 202 indicates the discharge current for distinction.

[0116] It can be understood that the second current threshold is a trigger condition. When the vehicle is running, its feedback current will change according to its running conditions. For example, according to the different forces of the driver stepping on the brake pedal, the magnitude of the feedback current will also be different. During the change process, it may trigger the corresponding second current threshold. At this time, the electronic device will obtain the second operating data within the second preset time period after triggering the second current threshold.

[0117] Among them, the second preset time period can be set according to actual needs. In the embodiment of the present application, 3 to 5 seconds is preferably set, so as to avoid errors caused by large data changes due to too long time and also avoid unstable data obtained due to too short time.

[0118] Specifically, the second operating data may include multiple second voltage values corresponding to the respective second current thresholds.

[0119] It can be understood that during the operation of the vehicle, due to various reasons, the magnitude of its current will not be the same within a certain period of time but will change, and its voltage data is also changing. Therefore, when a certain second current threshold is triggered, multiple first voltage values within a second preset time period can be obtained.

[0120] 204. Based on multiple first current thresholds and first operating data, determine the second discharge system internal resistance of the battery system, and based on multiple second current thresholds and second operating data, determine the second charge system internal resistance of the battery system.

[0121] Wherein, the first operating data includes multiple first voltage values corresponding to each of the first current thresholds.

[0122] Exemplarily, the following steps A1 and A2 can be used to implement how to determine the second discharge system internal resistance of the battery system based on the multiple first current thresholds and the first operating data:

[0123] A1. Based on each of the first current thresholds and the multiple first voltage values corresponding to each of the first current thresholds, determine the target system internal resistance of the battery system at each of the first current thresholds.

[0124] Wherein, the multiple first voltage values include a first starting voltage value V0 and multiple first ending voltage values V1, V2, V3 to Vn within the first preset time period. The first starting voltage value is the voltage value corresponding to the starting time point within the first preset time. Assuming that the first preset time period is five seconds in total, then the first starting voltage value is the voltage value at the 0s. And the first ending voltage values can be selected from any time period within these five seconds in sequence. Among them, the number of the multiple first ending voltage values can be set according to actual needs. In this application, 10 first ending voltage values are preferably selected. Combining the previous example, these ten first ending voltage values can respectively take the voltage values corresponding to 0.5s, 1s, 1.5s, 2s, 2.5s to 10s.

[0125] In some embodiments of this application, the following steps B1 to B3 can be used to implement how to determine the target system internal resistance of the battery system at each of the first current thresholds based on each of the first current thresholds and the multiple first voltage values corresponding to each of the first current thresholds:

[0126] B1. Subtract each of the first ending voltage values from the first starting voltage value respectively to obtain multiple first voltage differences.

[0127] Assume that one of the first voltage differences is an = Vn - V0.

[0128] B2. Compare each of the first pressure difference values with its corresponding first current threshold to obtain a plurality of first target internal resistance values.

[0129] Based on the above description, it can be known that there are a plurality of first current thresholds in the embodiments of the present application, preferably three. Then, each first current value corresponds to a plurality of first pressure difference values. In the embodiments of the present application, one of the first current values, I1, is used as an example. For example, one of the first target internal resistance values is Rn = (Vn - V0) / I1.

[0130] B3. Calculate the second average value of all the first target internal resistance values, and use the second average value as the target system internal resistance of the battery system at each of the first current thresholds.

[0131] Assume that n first target internal resistance values are obtained. Then, the second average value RX1 = (R1 + R2 +...... + Rn) / n.

[0132] A2. Calculate the first average value of the target system internal resistance at all the first current thresholds, and use the first average value as the second discharge system internal resistance of the battery system.

[0133] Assume that there are 3 first current thresholds. Then, based on the above steps B1 - B3, three target system internal resistances RX1, RX2, and RX3 can be obtained respectively. Then, the first average value Ra1 = (RX1 + RX2 + RX3) / 3.

[0134] Wherein, the second operation data includes a plurality of second voltage values corresponding to each of the second current thresholds.

[0135] Exemplarily, the following steps C1 and C2 can be used to implement how to determine the second charging system internal resistance of the battery system based on the plurality of second current thresholds and the second operation data:

[0136] C1. Based on each of the second current thresholds and the plurality of second voltage values corresponding to each of the second current thresholds, determine the target system internal resistance of the battery system at each of the second current thresholds.

[0137] Wherein, the plurality of second voltage values include a second starting voltage value and a plurality of second ending voltage values within the second preset time period.

[0138] In some embodiments of the present application, the following steps D1 and D2 can be used to implement how to determine the target system internal resistance of the battery system at each of the second current thresholds based on each of the second current thresholds and the plurality of second voltage values corresponding to each of the second current thresholds:

[0139] D1. Subtract each of the second end voltage values from the second start voltage value to obtain a plurality of second voltage differences.

[0140] D2. Divide each of the second voltage differences by its corresponding second current threshold to obtain a plurality of second target internal resistance values.

[0141] D3. Calculate the third average value of all the second target internal resistance values, and use the third average value as the target system internal resistance of the battery system at each of the second current thresholds.

[0142] C2. Calculate the second average value of the target system internal resistances at all the second current thresholds, and use the second average value as the second charging system internal resistance of the battery system.

[0143] It should be noted that the calculation principles of steps C1 - C2 and steps D1 - D3 are the same as those of steps A1 - A2 and steps B1 - B3 respectively above, and will not be elaborated here. Refer to the above description for details.

[0144] 205. Based on the first discharge system internal resistance, the first charging system internal resistance, the second discharge system internal resistance, and the second charging system internal resistance, give an early warning of the abnormal risk of the battery system.

[0145] Exemplarily, the following steps E1 to E3 can be used to implement how to give an early warning of the abnormal risk of the battery system based on the first discharge system internal resistance, the first charging system internal resistance, the second discharge system internal resistance, and the second charging system internal resistance:

[0146] E1. Subtract the second discharge system internal resistance from the first discharge system internal resistance to obtain a discharge system internal resistance difference.

[0147] E2. Subtract the second charging system internal resistance from the first charging system internal resistance to obtain a charging system internal resistance difference.

[0148] E3. Based on the discharge system internal resistance difference and the charging system internal resistance difference, give an early warning of the abnormal risk of the battery system.

[0149] Exemplarily, the following steps F1 to F3 can be used to implement how to give an early warning of the abnormal risk of the battery system based on the discharge system internal resistance difference and the charging system internal resistance difference:

[0150] F1. Compare the discharge system internal resistance difference with a preset first difference threshold to obtain a first comparison result.

[0151] Among them, the first difference threshold can be set according to actual needs and is not limited here.

[0152] F2. Compare the internal resistance difference of the charging system with a preset second difference threshold to obtain a second comparison result.

[0153] Among them, the second difference threshold can be set according to actual needs.

[0154] F3. If the first comparison result is that the internal resistance difference of the discharge system is greater than the first difference threshold, and / or the second comparison result is that the internal resistance difference of the charging system is greater than the second difference threshold, then give an early warning of the abnormal risk of the battery system.

[0155] The battery system abnormal risk warning method provided by the embodiments of the present application, compared with the traditional method, by obtaining the system internal resistance data of the battery system in multiple different states and analyzing it, can efficiently and accurately calculate the internal resistance of the battery system under the current actual situation, and realize the real-time detection of the internal resistance of the battery system without increasing any cost; at the same time, add a detection method for the safety of the battery system to improve the use safety of the battery system; and through the warning function, the after-sales maintenance cost can be reduced.

[0156] In order to better implement the battery system abnormal risk warning method in the embodiments of the present application, on the basis of the battery system abnormal risk warning method, an abnormal risk warning device for a battery system is further provided in the embodiments of the present application, as Figure 3 shown. The abnormal risk warning device 3300 for the battery system includes:

[0157] A first acquisition unit 301, configured to acquire a first discharge system internal resistance and a first charging system internal resistance of the battery system in a first state, where the first state is the state of performing a BOL test before loading the vehicle;

[0158] A second acquisition unit 302, configured to acquire first operation data of the battery system within a first preset time period after the discharge current of the battery system reaches a plurality of preset first current thresholds in a second state, where the second state is the state of performing discharge operation after loading the vehicle;

[0159] A third acquisition unit 303, configured to acquire second operation data of the battery system within a second preset time period after the charging current of the battery system reaches a plurality of preset second current thresholds in a third state, where the third state is the state of performing kinetic energy recovery after loading the vehicle;

[0160] A first determination unit 304 and a second determination unit 305, configured to determine a second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operation data, and determine a second charging system internal resistance of the battery system based on the plurality of second current thresholds and the second operation data;

[0161] The first warning unit 306 is configured to warn of the abnormal risk of the battery system based on the internal resistance of the first discharge system, the internal resistance of the first charging system, the internal resistance of the second discharge system, and the internal resistance of the second charging system.

[0162] In some embodiments of the present application, the first warning unit 306 specifically includes:

[0163] A first calculation unit configured to subtract the internal resistance of the second discharge system from the internal resistance of the first discharge system to obtain a difference in the internal resistance of the discharge system;

[0164] A second calculation unit configured to subtract the internal resistance of the second charging system from the internal resistance of the first charging system to obtain a difference in the internal resistance of the charging system;

[0165] A second warning unit configured to warn of the abnormal risk of the battery system based on the difference in the internal resistance of the discharge system and the difference in the internal resistance of the charging system.

[0166] In some embodiments of the present application, the warning of the abnormal risk of the battery system based on the difference in the internal resistance of the discharge system and the difference in the internal resistance of the charging system is specifically configured to:

[0167] Compare the difference in the internal resistance of the discharge system with a preset first difference threshold to obtain a first comparison result;

[0168] Compare the difference in the internal resistance of the charging system with a preset second difference threshold to obtain a second comparison result;

[0169] If the first comparison result is that the difference in the internal resistance of the discharge system is greater than the first difference threshold, and / or the second comparison result is that the difference in the internal resistance of the charging system is greater than the second difference threshold, then a warning is given for the abnormal risk of the battery system.

[0170] In some embodiments of the present application, the first operating data includes a plurality of first voltage values corresponding to each of the first current thresholds;

[0171] The first determination unit 304 specifically includes:

[0172] A third determination unit configured to determine the target system internal resistance of the battery system at each of the first current thresholds based on each of the first current thresholds and the plurality of first voltage values corresponding to each of the first current thresholds;

[0173] A third calculation unit configured to calculate a first average value of the target system internal resistances at all the first current thresholds and use the first average value as the internal resistance of the second discharge system of the battery system.

[0174] In some embodiments of the present application, the plurality of first voltage values include a first starting voltage value and a plurality of first ending voltage values within the first preset time period;

[0175] The third determining unit is specifically configured to:

[0176] Subtract each of the first ending voltage values from the first starting voltage value to obtain a plurality of first voltage differences;

[0177] Compare each of the first voltage differences with its corresponding first current threshold to obtain a plurality of first target internal resistance values;

[0178] Calculate a second average value of all the first target internal resistance values, and use the second average value as the target system internal resistance of the battery system at each of the first current thresholds.

[0179] In some embodiments of the present application, the second operating data includes a plurality of second voltage values corresponding to each of the second current thresholds;

[0180] The second determining unit 305 specifically includes:

[0181] A fourth determining unit, configured to determine the target system internal resistance of the battery system at each of the second current thresholds based on each of the second current thresholds and the plurality of second voltage values corresponding to each of the second current thresholds;

[0182] A fourth calculating unit, configured to calculate a second average value of the target system internal resistances at all the second current thresholds, and use the second average value as the second charging system internal resistance of the battery system.

[0183] In some embodiments of the present application, the plurality of second voltage values include a second starting voltage value and a plurality of second ending voltage values within the second preset time period;

[0184] The fourth determining unit is specifically configured to:

[0185] Subtract each of the second ending voltage values from the second starting voltage value to obtain a plurality of second voltage differences;

[0186] Compare each of the second voltage differences with its corresponding second current threshold to obtain a plurality of second target internal resistance values;

[0187] Calculate a third average value of all the second target internal resistance values, and use the third average value as the target system internal resistance of the battery system at each of the second current thresholds.

[0188] In an embodiment of the present application, a first acquisition unit 301 is configured to acquire a first discharge system internal resistance and a first charge system internal resistance of a battery system in a first state, where the first state is the state of performing a BOL test before vehicle installation; a second acquisition unit 302 is configured to acquire first operation data within a first preset time period after the discharge current of the battery system in a second state reaches a plurality of preset first current thresholds, where the second state is the state of performing discharge operation after vehicle installation; a third acquisition unit 303 is configured to acquire second operation data within a second preset time period after the charge current of the battery system in a third state reaches a plurality of preset second current thresholds, where the third state is the state of performing kinetic energy recovery after vehicle installation; a first determination unit 304 and a second determination unit 305 are configured to determine a second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operation data, and determine a second charge system internal resistance of the battery system based on the plurality of second current thresholds and the second operation data; a first warning unit 306 is configured to give a warning about the abnormal risk of the battery system based on the first discharge system internal resistance, the first charge system internal resistance, the second discharge system internal resistance, and the second charge system internal resistance. Compared with traditional devices, by acquiring the system internal resistance data of the battery system in multiple different states and performing analysis, the actual internal resistance of the battery system in the current situation can be calculated efficiently and accurately, realizing real-time detection of the internal resistance of the battery system without adding any cost; at the same time, adding a detection method for the safety of the battery system to improve the use safety of the battery system; and through the warning function, the after-sales maintenance cost can be reduced.

[0189] In addition to the above-described method and device for warning about abnormal risks of a battery system, an embodiment of the present application further provides an electronic device that integrates any one of the battery system abnormal risk warning devices provided in the embodiments of the present application. The electronic device includes:

[0190] One or more processors;

[0191] A memory; and

[0192] One or more applications, where the one or more applications are stored in the memory and are configured to be executed by the processor to perform the operations of any one of the methods in any one of the embodiments of the above-described battery system abnormal risk warning method.

[0193] An embodiment of the present application further provides an electronic device that integrates any one of the battery system abnormal risk warning devices provided in the embodiments of the present application. As Figure 4 shown, it shows a schematic structural diagram of the electronic device involved in the embodiments of the present application. Specifically:

[0194] The electronic device may include components such as a processor 401 with one or more processing cores, a storage unit 402 of one or more computer-readable storage media, a power supply 403, and an input unit 404. Those skilled in the art can understand that Figure 4 the structure of the electronic device shown in

[0195] does not limit the electronic device, and it may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0196] The processor 401 is the control center of the electronic device, connecting various parts of the entire electronic device through various interfaces and circuits. By running or executing software programs and / or modules stored in the storage unit 402, and by invoking the data stored in the storage unit 402, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 401 may include one or more processing cores; preferably, the processor 401 may integrate an application processor and a modem processor. Among them, the application processor mainly processes the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor may not be integrated into the processor 401.

[0197] The storage unit 402 can be used to store software programs and modules. The processor 401 executes various functional applications and data processing by running the software programs and modules stored in the storage unit 402. The storage unit 402 may mainly include a program storage area and a data storage area. Among them, the program storage area can store the operating system, application programs required for at least one function (such as the sound playback function, image playback function, etc.); the data storage area can store data created according to the use of the electronic device. In addition, the storage unit 402 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. Correspondingly, the storage unit 402 may also include a memory controller to provide the processor 401 with access to the storage unit 402.

[0198] The electronic device also includes a power supply 403 that powers each component. Preferably, the power supply 403 can be logically connected to the processor 401 through a power management system, so as to manage functions such as charging, discharging, and power consumption management through the power management system. The power supply 403 may also include any components such as one or more DC or AC power supplies, a recharge system, a power failure detection circuit, a power converter or inverter, and a power status indicator.

[0199] The electronic device may further include an input unit 404, which may be configured to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0200] Although not shown, the electronic device may further include a display unit and the like, which will not be elaborated here. Specifically, in the embodiment of the present application, the processor 401 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the storage unit 402 according to the following instructions, and the processor 401 will run the application programs stored in the storage unit 402 to implement various functions as follows:

[0201] Obtain the first discharge system internal resistance and the first charge system internal resistance of the battery system in a first state, where the first state is the state of performing a BOL test before vehicle installation; obtain the first operation data within a first preset time period after the discharge current of the battery system in a second state reaches a plurality of preset first current thresholds, where the second state is the state of performing discharge operation after vehicle installation; obtain the second operation data within a second preset time period after the charge current of the battery system in a third state reaches a plurality of preset second current thresholds, where the third state is the state of performing kinetic energy recovery after vehicle installation; determine the second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operation data, and determine the second charge system internal resistance of the battery system based on the plurality of second current thresholds and the second operation data; based on the first discharge system internal resistance, the first charge system internal resistance, the second discharge system internal resistance, and the second charge system internal resistance, give an early warning of the abnormal risk of the battery system.

[0202] The present application provides a method for warning of abnormal risk of a battery system. Compared with traditional methods, by obtaining the system internal resistance data of the battery system in multiple different states and performing analysis, the actual current internal resistance of the battery system can be calculated efficiently and accurately, realizing real-time detection of the internal resistance of the battery system without increasing any cost; at the same time, adding a detection method for the safety of the battery system to improve the use safety of the battery system; and through the early warning function, the after-sales maintenance cost can be reduced.

[0203] To this end, an embodiment of the present application provides a computer-readable storage medium, which may include: a read-only memory (ROM, Read Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disc, etc. A plurality of instructions are stored in the computer-readable storage medium, and the instructions can be loaded by a processor to execute the steps in any of the battery system abnormal risk warning methods provided by the embodiments of the present application. For example, the instructions may execute the following steps:

[0204] Obtain the first discharge system internal resistance and the first charge system internal resistance of the battery system in a first state, where the first state is the state of performing a BOL test before loading the vehicle; obtain the first operating data within a first preset time period after the discharge current of the battery system in a second state reaches a plurality of preset first current thresholds, where the second state is the state of performing a discharge operation after loading the vehicle; obtain the second operating data within a second preset time period after the charge current of the battery system in a third state reaches a plurality of preset second current thresholds, where the third state is the state of performing kinetic energy recovery after loading the vehicle; determine the second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operating data, and determine the second charge system internal resistance of the battery system based on the plurality of second current thresholds and the second operating data; and give a warning of the abnormal risk of the battery system based on the first discharge system internal resistance, the first charge system internal resistance, the second discharge system internal resistance, and the second charge system internal resistance.

[0205] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0206] The above has introduced in detail a battery system abnormal risk warning method, device and related equipment provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A method for warning of abnormal risk of a battery system, characterized in that, The method includes: Obtaining a first discharge system internal resistance and a first charge system internal resistance of the battery system in a first state, where the first state is the state of performing a BOL test before vehicle installation; Obtaining first operation data of the battery system within a first preset time period after the discharge current in a second state reaches a plurality of preset first current thresholds, where the second state is the state of performing discharge operation after vehicle installation; Obtaining second operation data of the battery system within a second preset time period after the charge current in a third state reaches a plurality of preset second current thresholds, where the third state is the state of performing kinetic energy recovery after vehicle installation; Based on the plurality of first current thresholds and the first operation data, determining a second discharge system internal resistance of the battery system, and based on the plurality of second current thresholds and the second operation data, determining a second charge system internal resistance of the battery system; Based on the first discharge system internal resistance, the first charge system internal resistance, the second discharge system internal resistance, and the second charge system internal resistance, giving an early warning of the abnormal risk of the battery system; Wherein, the giving an early warning of the abnormal risk of the battery system based on the first discharge system internal resistance, the first charge system internal resistance, the second discharge system internal resistance, and the second charge system internal resistance includes: Taking the difference between the first discharge system internal resistance and the second discharge system internal resistance to obtain a discharge system internal resistance difference; Taking the difference between the first charge system internal resistance and the second charge system internal resistance to obtain a charge system internal resistance difference; Based on the discharge system internal resistance difference and the charge system internal resistance difference, giving an early warning of the abnormal risk of the battery system.

2. The battery system abnormal risk warning method according to claim 1, wherein The giving an early warning of the abnormal risk of the battery system based on the discharge system internal resistance difference and the charge system internal resistance difference includes: Comparing the discharge system internal resistance difference with a preset first difference threshold to obtain a first comparison result; Comparing the charge system internal resistance difference with a preset second difference threshold to obtain a second comparison result; If the first comparison result is that the discharge system internal resistance difference is greater than the first difference threshold, and / or the second comparison result is that the charge system internal resistance difference is greater than the second difference threshold, then giving an early warning of the abnormal risk of the battery system.

3. The battery system abnormal risk warning method according to claim 1 or 2, characterized in that, The first operation data includes a plurality of first voltage values corresponding to each of the first current thresholds; The determining the second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operation data includes: Based on each of the first current thresholds and the plurality of first voltage values corresponding to each of the first current thresholds, determining a target system internal resistance of the battery system at each of the first current thresholds; Calculating a first average value of the target system internal resistances at all the first current thresholds, and taking the first average value as the second discharge system internal resistance of the battery system.

4. The battery system abnormal risk warning method according to claim 3, wherein The plurality of first voltage values include a first starting voltage value and a plurality of first ending voltage values within the first preset time period; Determining the target system internal resistance of the battery system at each of the first current thresholds based on each of the first current thresholds and a plurality of first voltage values corresponding to each of the first current thresholds includes: Subtracting each of the first end voltage values from the first start voltage value respectively to obtain a plurality of first voltage differences; Dividing each of the first voltage differences by its corresponding first current threshold respectively to obtain a plurality of first target internal resistance values; Calculating a second average value of all the first target internal resistance values, and taking the second average value as the target system internal resistance of the battery system at each of the first current thresholds.

5. The battery system abnormal risk warning method according to claim 1 or 2, characterized in that The second operating data includes a plurality of second voltage values corresponding to each of the second current thresholds; Determining the second charging system internal resistance of the battery system based on the plurality of second current thresholds and the second operating data includes: Determining the target system internal resistance of the battery system at each of the second current thresholds based on each of the second current thresholds and a plurality of second voltage values corresponding to each of the second current thresholds; Calculating a second average value of the target system internal resistances at all the second current thresholds, and taking the second average value as the second charging system internal resistance of the battery system.

6. The battery system abnormal risk warning method according to claim 5, characterized in that, The plurality of second voltage values include a second start voltage value and a plurality of second end voltage values within the second preset time period; Determining the target system internal resistance of the battery system at each of the second current thresholds based on each of the second current thresholds and a plurality of second voltage values corresponding to each of the second current thresholds includes: Subtracting each of the second end voltage values from the second start voltage value respectively to obtain a plurality of second voltage differences; Dividing each of the second voltage differences by its corresponding second current threshold respectively to obtain a plurality of second target internal resistance values; Calculating a third average value of all the second target internal resistance values, and taking the third average value as the target system internal resistance of the battery system at each of the second current thresholds.

7. A battery system abnormal risk warning device, characterized in that, The device includes: A first acquisition unit, configured to acquire a first discharge system internal resistance and a first charging system internal resistance of the battery system in a first state, where the first state is the state of performing a BOL test before vehicle installation; A second acquisition unit, configured to acquire first operating data of the battery system within a first preset time period after the discharge current reaches a plurality of preset first current thresholds in a second state, where the second state is the state of performing a discharge operation after vehicle installation; A third acquisition unit, configured to acquire second operating data of the battery system within a second preset time period after the charging current reaches a plurality of preset second current thresholds in a third state, where the third state is the state of performing kinetic energy recovery after vehicle installation; A first determination unit and a second determination unit, configured to determine a second discharge system internal resistance of the battery system based on the plurality of first current thresholds and the first operating data, and determine a second charging system internal resistance of the battery system based on the plurality of second current thresholds and the second operating data; The first warning unit is used to give a warning about the abnormal risk of the battery system based on the internal resistance of the first discharge system, the internal resistance of the first charging system, the internal resistance of the second discharge system, and the internal resistance of the second charging system; Among them, the first warning unit specifically includes: The first calculation unit is used to subtract the internal resistance of the second discharge system from the internal resistance of the first discharge system to obtain the internal resistance difference of the discharge system; The second calculation unit is used to subtract the internal resistance of the second charging system from the internal resistance of the first charging system to obtain the internal resistance difference of the charging system; The second warning unit is used to give a warning about the abnormal risk of the battery system based on the internal resistance difference of the discharge system and the internal resistance difference of the charging system.

8. An electronic device, characterized in that, The electronic device includes: One or more processors; A memory; and One or more application programs, where the one or more application programs are stored in the memory and are configured to be executed by the processor to implement the battery system abnormal risk warning method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and the computer program is loaded by the processor to execute the steps in the battery system abnormal risk warning method according to any one of claims 1 to 6.

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