Safety early warning method and device for power battery, vehicle and storage medium

Abstract

The invention relates to the technical field of power batteries, in particular to a safety early warning method and device for a power battery, a vehicle and a storage medium. The method comprises the following steps: generating a first target temperature parameter proportion by using a first target highest temperature value, a first target charging temperature difference value and a first target temperature rise value of a power battery of a target vehicle in a historical charging state; and determining a target risk level of the target vehicle by using a first boxplot, a second boxplot and a third boxplot corresponding to a second target highest temperature value, a second target charging temperature difference value and a second target temperature rise value of all vehicles in a historical charging state in an area of the target vehicle to a first target temperature parameter, therefore, a power battery safety early warning signal is generated. Therefore, the problem that the reliability of safety early warning of the power battery is reduced due to the fact that the upper limit and the lower limit of the temperature are determined only depending on the environment temperature and the fixed rule and the real temperature performance of the vehicle under different use conditions cannot be reflected in time in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a safety warning method, device, vehicle and storage medium for a power battery. Background Art

[0002] In recent years, with the increasing sales of new energy vehicles, vehicle thermal runaway incidents have also increased, and battery safety issues have become increasingly prominent. Through power battery safety warnings before thermal runaway occurs, abnormalities can be identified in advance and timely measures can be taken to avoid the risk of thermal runaway. Temperature is one of the key factors to focus on in vehicle abnormalities and plays an important role in safety warnings.

[0003] In the related art, the upper limit of the power battery temperature on a certain day is determined by the relationship between the maximum temperature of the vehicle's power battery and the maximum temperature of the environment, and the lower limit of the power battery temperature on a certain day is determined by the relationship between the minimum temperature of the vehicle's power battery and the minimum temperature of the environment. If the maximum temperature of the power battery on that day is greater than the upper limit of the power battery temperature on that day or the minimum temperature of the power battery is less than the lower limit of the power battery temperature, an alarm is issued and the alarm information is summarized.

[0004] However, the relevant technology only relies on ambient temperature and fixed rules to determine the upper and lower temperature limits, fails to fully consider the vehicle's operating status, and cannot timely reflect the vehicle's actual temperature performance under different usage conditions, reducing the accuracy and reliability of power battery safety warnings, which needs to be urgently resolved. Summary of the invention

[0005] The present application provides a power battery safety warning method, device, vehicle and storage medium to solve the problems in the related technology that only relies on ambient temperature and fixed rules to determine the upper and lower temperature limits, fails to fully consider the vehicle's operating status, cannot timely reflect the vehicle's actual temperature performance under different usage conditions, and reduces the accuracy and reliability of power battery safety warnings.

[0006] A first aspect of the present application provides a power battery safety warning method, comprising the following steps: obtaining a first target maximum temperature value, a first target charging temperature difference value, and a first target temperature rise value of a power battery of a target vehicle under a historical charging state; using the first target maximum temperature value, the first target charging temperature difference value, and the first target temperature rise value to generate a first target temperature parameter ratio of the target vehicle; obtaining a first box plot, a second box plot, and a third box plot corresponding to the second target maximum temperature value, the second target charging temperature difference value, and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging state, and determining a target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot, and the first target temperature parameter ratio, so as to generate a power battery safety warning signal for the target vehicle according to the target risk level.

[0007] Optionally, in one embodiment of the present application, the obtaining of the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value of the power battery of the target vehicle under the historical charging state includes: when the historical charging state is the fast charging state, extracting the single cell maximum temperature field of each frame during fast charging of the power battery, and determining the first maximum temperature value of the single cell in each frame of the target vehicle in the fast charging state according to the single cell maximum temperature field of each frame during fast charging; when the historical charging state is the fast charging state, extracting the single cell maximum temperature value and the single cell minimum temperature field of each frame during fast charging, and calculating the first charging temperature difference value of each frame of the target vehicle in the fast charging state according to the single cell maximum temperature value and the single cell minimum temperature field of each frame during fast charging; when the historical charging state is the fast charging state, extracting the single cell maximum temperature value of each frame during fast charging, and calculating the first temperature rise value of the target vehicle in the fast charging state according to the single cell maximum temperature value of each frame during fast charging.

[0008] Optionally, in one embodiment of the present application, the use of the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value to generate the first target temperature parameter ratio of the target vehicle includes: obtaining the total number of frames of the target vehicle in the fast charging state, and determining the parameter ratio of the first maximum temperature value based on the number of frames of the first maximum temperature value and the total number of frames; determining the parameter ratio of the first charging temperature difference value using the number of frames of the first charging temperature difference value and the total number of frames of the fast charging state; determining the parameter ratio of the first temperature rise value using the number of frames of the first temperature rise value and the total number of frames of the fast charging state.

[0009] Optionally, in one embodiment of the present application, the obtaining of the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value of the power battery of the target vehicle under the historical charging state includes: when the historical charging state is a slow charging state, extracting the maximum temperature field of the single cell of each frame during slow charging of the power battery, and determining the second maximum temperature value of the single cell of each frame of the target vehicle in the slow charging state according to the maximum temperature field of the single cell of each frame during slow charging; when the historical charging state is the slow charging state, extracting the maximum temperature value and the minimum temperature field of the single cell of each frame during slow charging, and calculating the second charging temperature difference value of each frame of the target vehicle in the slow charging state according to the maximum temperature value and the minimum temperature field of the single cell of each frame during slow charging; when the historical charging state is the slow charging state, extracting the maximum temperature value of the single cell of each frame during slow charging, and calculating the second temperature rise value of the target vehicle in the slow charging state according to the maximum temperature value of the single cell of each frame during slow charging.

[0010] Optionally, in one embodiment of the present application, the use of the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value to generate the first target temperature parameter ratio of the target vehicle includes: obtaining the total number of frames in which the target vehicle is in the slow charging state, and determining the parameter ratio of the second maximum temperature value based on the number of frames of the second maximum temperature value and the total number of frames in the slow charging state; determining the parameter ratio of the second charging temperature difference value based on the number of frames of the second charging temperature difference value and the total number of frames in the slow charging state; determining the parameter ratio of the second temperature rise value based on the number of frames of the second temperature rise value and the total number of frames in the slow charging state; generating the first target temperature parameter ratio of the target vehicle based on the parameter ratio of the first maximum temperature value, the parameter ratio of the first charging temperature difference value, the parameter ratio of the first temperature rise value, the parameter ratio of the second maximum temperature value, the parameter ratio of the second charging temperature difference value and the parameter ratio of the second temperature rise value.

[0011] Optionally, in one embodiment of the present application, determining the target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot and the first target temperature parameter ratio includes: detecting whether the target vehicle meets the target potential risk condition; when it is detected that the target vehicle meets the target potential risk condition, determining the target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot and the first target temperature parameter ratio.

[0012] A second aspect of the present application provides a safety warning device for a power battery, including: an acquisition module, used to obtain a first target maximum temperature value, a first target charging temperature difference value and a first target temperature rise value of a power battery of a target vehicle under a historical charging state; a generation module, used to generate a first target temperature parameter ratio of the target vehicle using the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value; a warning module, used to obtain a first box plot, a second box plot and a third box plot corresponding to the second target maximum temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging state, and determine a target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot and the first target temperature parameter ratio, so as to generate a safety warning signal for the power battery for the target vehicle according to the target risk level.

[0013] Optionally, in one embodiment of the present application, the acquisition module includes: a first extraction unit, used to extract the maximum cell temperature field of each frame of the power battery during fast charging when the historical charging state is the fast charging state, and determine the first maximum temperature value of the cell in each frame of the target vehicle in the fast charging state according to the maximum cell temperature field of each frame during fast charging; a second extraction unit, used to extract the maximum cell temperature value and the minimum cell temperature field of each frame during fast charging when the historical charging state is the fast charging state, and calculate the first charging temperature difference value of each frame of the target vehicle in the fast charging state according to the maximum cell temperature value and the minimum cell temperature field of each frame during fast charging; a third extraction unit, used to extract the maximum cell temperature value of each frame during fast charging when the historical charging state is the fast charging state, and calculate the first temperature rise value of the target vehicle in the fast charging state according to the maximum cell temperature value of each frame during fast charging.

[0014] Optionally, in one embodiment of the present application, the generation module includes: a first acquisition unit, used to obtain the total number of frames of the target vehicle in the fast charging state, and determine the parameter proportion of the first highest temperature value based on the number of frames of the first highest temperature value and the total number of frames; a first determination unit, used to determine the parameter proportion of the first charging temperature difference value using the number of frames of the first charging temperature difference value and the total number of frames of the fast charging state; a second determination unit, used to determine the parameter proportion of the first temperature rise value using the number of frames of the first temperature rise value and the total number of frames of the fast charging state.

[0015] Optionally, in one embodiment of the present application, the acquisition module includes: a fourth extraction unit, used to extract the maximum cell temperature field of each frame of the power battery during slow charging when the historical charging state is a slow charging state, and determine the second maximum temperature value of the cell in each frame of the target vehicle in the slow charging state based on the maximum cell temperature field of each frame during slow charging; a fifth extraction unit, used to extract the maximum cell temperature value and the minimum cell temperature field of each frame during slow charging when the historical charging state is the slow charging state, and calculate the second charging temperature difference value of each frame of the target vehicle in the slow charging state based on the maximum cell temperature value and the minimum cell temperature field of each frame during slow charging; a sixth extraction unit, used to extract the maximum cell temperature value of each frame during slow charging when the historical charging state is the slow charging state, and calculate the second temperature rise value of the target vehicle in the slow charging state based on the maximum cell temperature value of each frame during slow charging.

[0016] Optionally, in one embodiment of the present application, the generation module includes: a second acquisition unit, used to acquire the total number of frames in which the target vehicle is in the slow charging state, and determine the parameter proportion of the second highest temperature value based on the number of frames of the second highest temperature value and the total number of frames in the slow charging state; a third determination unit, used to determine the parameter proportion of the second charging temperature difference value based on the number of frames of the second charging temperature difference value and the total number of frames in the slow charging state; a fourth determination unit, used to determine the parameter proportion of the second temperature rise value based on the number of frames of the second temperature rise value and the total number of frames in the slow charging state; a generation unit, used to generate the first target temperature parameter proportion of the target vehicle based on the parameter proportion of the first highest temperature value, the parameter proportion of the first charging temperature difference value, the parameter proportion of the first temperature rise value, the parameter proportion of the second highest temperature value, the parameter proportion of the second charging temperature difference value, and the parameter proportion of the second temperature rise value.

[0017] Optionally, in one embodiment of the present application, the early warning module includes: a detection unit, used to detect whether the target vehicle meets the target potential risk condition; an early warning unit, used to determine the target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot and the first target temperature parameter ratio when it is detected that the target vehicle meets the target potential risk condition.

[0018] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the power battery safety warning method as described in the above embodiment.

[0019] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned power battery safety warning method.

[0020] A fifth aspect of the present application provides a computer program product, including a computer program, which, when executed, is used to implement the above-mentioned power battery safety warning method.

[0021] The embodiment of the present application can generate the first target temperature parameter ratio using the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value of the power battery of the target vehicle under the historical charging state, and use the first box plot, the second box plot and the third box plot corresponding to the second target maximum temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging state and the first target temperature parameter ratio to determine the target risk level of the target vehicle, thereby generating a power battery safety warning signal, effectively improving the accuracy and reliability of the power battery safety warning. Therefore, it solves the problems in the related art that only the ambient temperature and fixed rules are relied on to determine the upper and lower limits of the temperature, and the actual temperature performance of the vehicle under different use conditions cannot be reflected in time, and the accuracy and reliability of the power battery safety warning is reduced.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 A flowchart of a safety warning method for a power battery provided according to an embodiment of the present application;

[0025] Figure 2 A logic diagram of a safety warning of a power battery according to a specific embodiment of the present application;

[0026] Figure 3 A risk level logic diagram of a security warning for a specific embodiment of the present application;

[0027] Figure 4 A schematic diagram of the structure of a safety warning device for a power battery provided according to an embodiment of the present application;

[0028] Figure 5 It is a schematic diagram of the structure of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0030] The following describes the safety warning method, device, vehicle and storage medium of the power battery of the embodiment of the present application with reference to the accompanying drawings. In view of the above-mentioned related art mentioned in the background technology, which only relies on ambient temperature and fixed rules to determine the upper and lower limits of temperature, cannot timely reflect the actual temperature performance of the vehicle under different use conditions, and reduces the accuracy and reliability of the safety warning of the power battery. The present application provides a safety warning method for a power battery, in which the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value of the power battery of the target vehicle under the historical charging state can be used to generate the first target temperature parameter ratio, and the first box line diagram, the second box line diagram and the third box line diagram corresponding to the second target maximum temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging state and the first target temperature parameter ratio are used to determine the target risk level of the target vehicle, thereby generating a power battery safety warning signal, which effectively improves the accuracy and reliability of the power battery safety warning. Therefore, it solves the problems that the related art only relies on ambient temperature and fixed rules to determine the upper and lower limits of temperature, cannot timely reflect the actual temperature performance of the vehicle under different use conditions, and reduces the accuracy and reliability of the safety warning of the power battery.

[0031] Specifically, Figure 1 A schematic flow chart of a safety warning method for a power battery provided in an embodiment of the present application.

[0032] like Figure 1 As shown, the safety warning method of the power battery includes the following steps:

[0033] In step S101 , a first target maximum temperature value, a first target charging temperature difference value, and a first target temperature rise value of a power battery of a target vehicle under a historical charging state are obtained.

[0034] In an embodiment of the present application, the target vehicle is a vehicle for testing the safety of a power battery; the historical charging status of the power battery may include a historical fast charging status and a historical slow charging status.

[0035] It can be understood that the embodiments of the present application can obtain the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value of the power battery of the vehicle under the historical charging state. For example, the fast charging maximum temperature value, the fast charging temperature difference value and the fast charging temperature rise value corresponding to the historical fast charging state of the vehicle can be obtained, and the slow charging maximum temperature value, the slow charging temperature difference value and the slow charging temperature rise value corresponding to the historical slow charging state of the vehicle can also be obtained. Therefore, the safety of the power battery can be detected according to the historical charging temperature of the power battery, effectively improving the feasibility of the power battery safety warning.

[0036] It should be noted that the embodiment of the present application can extract target data segments from the power battery operation data: the operation process includes the charging process. The charging process generally refers to the vehicle status flag and selects the data of the charging flag code; if there is no status flag, the change of the current and the battery state of charge can be referred to. With the increase of time, when there is current, the battery state of charge continues to rise, indicating that it is in the charging state. Each charging process of each vehicle needs to be saved independently so that the temperature element of the charging process can be calculated later;

[0037] Next, the embodiment of the present application can eliminate abnormal data in advance: since some abnormal data values ​​may appear during the operation of the vehicle due to reasons such as data uploading, such as null value, 0 or temperature value exceeding the normal range of relevant characteristic parameters, for example, the temperature is 702°C. Since the parameters of each car manufacturer and each model are different and the strategies of the battery management system are different, the fixed value is also different and is not specifically limited here.

[0038] Optionally, in one embodiment of the present application, a first target maximum temperature value, a first target charging temperature difference value and a first target temperature rise value of the power battery of the target vehicle under a historical charging state are obtained, including: when the historical charging state is a fast charging state, extracting the single cell maximum temperature field of each frame during fast charging of the power battery, and determining the first maximum temperature value of the single cell in each frame of the target vehicle in the fast charging state according to the single cell maximum temperature field of each frame during fast charging; when the historical charging state is a fast charging state, extracting the single cell maximum temperature value and the single cell minimum temperature field of each frame during fast charging, and calculating the first charging temperature difference value of each frame of the target vehicle in the fast charging state according to the single cell maximum temperature value and the single cell minimum temperature field of each frame during fast charging; when the historical charging state is a fast charging state, extracting the single cell maximum temperature value of each frame during fast charging, and calculating the first temperature rise value of the target vehicle in the fast charging state according to the single cell maximum temperature value of each frame during fast charging.

[0039] In the embodiment of the present application, each frame refers to each piece of vehicle data uploaded, that is, two adjacent pieces of vehicle data are uploaded at a time interval of 1s, 5s, or 10s.

[0040] In the actual implementation process, Figure 2 As shown, the embodiment of the present application can, when the historical charging state is the fast charging state, for example, select the charging data of the past three months, extract the maximum temperature field of each cell in each frame when the power battery is fast charged, and determine the first maximum temperature value of the cell in each frame when the vehicle is in the fast charging state according to the maximum temperature field of each cell in each frame; then, the embodiment of the present application can also extract the maximum temperature value of the cell and the minimum temperature field of each cell in each frame when fast charging, and calculate the first charging temperature difference value of each frame when the target vehicle is in the fast charging state according to the maximum temperature value of the cell and the minimum temperature field of each cell in each frame, that is: the first charging temperature difference value = the maximum temperature value of the cell in the fast charging state - the minimum temperature value of the cell in the fast charging state; secondly, the embodiment of the present application can also extract the maximum temperature value of the cell in each frame when fast charging, and calculate the first temperature rise value of the vehicle in the fast charging state according to the maximum temperature value of the cell in each frame, and calculate the temperature rise value of the process in units of each fast charging process of each vehicle, that is: the first temperature rise value = the maximum temperature value of the cell in the fast charging process - the maximum temperature value of the cell corresponding to the first frame in the fast charging process, thereby effectively improving the accuracy of the power battery safety warning.

[0041] Optionally, in one embodiment of the present application, a first target maximum temperature value, a first target charging temperature difference value and a first target temperature rise value of the power battery of the target vehicle under a historical charging state are obtained, including: when the historical charging state is a slow charging state, extracting the cell maximum temperature field of each frame of the power battery during slow charging, and determining the second maximum temperature value of the cell in each frame of the target vehicle in the slow charging state based on the cell maximum temperature field of each frame during slow charging; when the historical charging state is a slow charging state, extracting the cell maximum temperature value and the cell minimum temperature field of each frame during slow charging, and calculating the second charging temperature difference value of each frame of the target vehicle in the slow charging state based on the cell maximum temperature value and the cell minimum temperature field of each frame during slow charging; when the historical charging state is a slow charging state, extracting the cell maximum temperature value of each frame during slow charging, and calculating the second temperature rise value of the target vehicle in the slow charging state based on the cell maximum temperature value of each frame during slow charging.

[0042] As a possible way to achieve this, Figure 2As shown, the embodiment of the present application can take the charging data of the past three months when the historical charging state is the slow charging state, extract the maximum temperature field of the single cell in each frame of the power battery during slow charging, and determine the second maximum temperature value of the single cell in each frame of the vehicle in the slow charging state according to the maximum temperature field of the single cell in each frame of the slow charging; then, extract the maximum temperature value of the single cell and the minimum temperature field of the single cell in each frame of the slow charging, and calculate the second charging temperature difference value of each frame of the vehicle in the slow charging state according to the maximum temperature value of the single cell and the minimum temperature field of the single cell in each frame of the slow charging, that is: the second charging temperature difference value = the maximum temperature value of the single cell in the slow charging state - the minimum temperature value of the single cell in the slow charging state; secondly, the maximum temperature value of the single cell in each frame of the slow charging can also be extracted, and the second temperature rise value of the vehicle in the slow charging state can be calculated according to the maximum temperature value of the single cell in each frame of the slow charging, that is: the second temperature rise value = the maximum temperature value of the single cell in the slow charging process - the maximum temperature value of the single cell corresponding to the first frame in the slow charging process, thereby effectively improving the robustness and reliability of the power battery safety warning.

[0043] In step S102, a first target temperature parameter ratio of the target vehicle is generated using the first target maximum temperature value, the first target charging temperature difference value, and the first target temperature rise value.

[0044] It can be understood that the embodiment of the present application can use the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value in the following steps to generate the first target temperature parameter ratio of the target vehicle, wherein the first target maximum temperature value includes the first maximum temperature value and the second maximum temperature value, the first target charging temperature difference value includes the first charging temperature difference value and the second charging temperature difference value, and the first target temperature rise value includes the first temperature rise value and the second temperature rise value. The embodiment of the present application can determine whether the vehicle is an abnormal vehicle based on the first target temperature parameter ratio of the target vehicle, and when the vehicle is an abnormal vehicle, a safety warning of the power battery can be issued, thereby effectively improving the safety of the vehicle.

[0045] Optionally, in one embodiment of the present application, a first target maximum temperature value, a first target charging temperature difference value and a first target temperature rise value are used to generate a first target temperature parameter ratio of the target vehicle, including: obtaining the total number of frames in which the target vehicle is in a fast charging state, and determining the parameter ratio of the first maximum temperature value based on the number of frames of the first maximum temperature value and the total number of frames; determining the parameter ratio of the first charging temperature difference value using the number of frames of the first charging temperature difference value and the total number of frames of the fast charging state; determining the parameter ratio of the first temperature rise value using the number of frames of the first temperature rise value and the total number of frames of the fast charging state.

[0046] For example, Figure 2As shown, the embodiment of the present application can count the maximum temperature of each cell in each frame of the vehicle fast charging state according to the above steps, and calculate the proportion of the number of frames in each maximum temperature range to the total number of frames. For example, a vehicle has a total of 10,000 frames in the fast charging state, and a total of 3,000 frames when the maximum temperature value of the cell is 20°C, then the proportion is 30%; when the vehicle threshold (δ1) meets the following conditions: when the maximum temperature value of the cell is ≥50°C, and the number of frames in the maximum temperature range accounts for 20%, it is considered that the vehicle has entered the potential risk range;

[0047] Next, the proportion of the number of frames in each charging temperature difference range to the total number of frames can also be calculated according to the above steps. For example, a vehicle has 10,000 frames in the fast charging state, and 7,000 frames when the charging temperature difference is 2°C, then the proportion is 70%; when the vehicle threshold (δ2) meets the following conditions: when the charging temperature difference is ≥5°C, the number of frames in the charging temperature difference range accounts for 10%, then the vehicle is considered to have entered the potential risk range;

[0048] Secondly, the proportion of the number of fast charging in each temperature rise range to the total number of fast charging can also be calculated according to the above steps. For example, a vehicle has a total of 50 fast charging processes, and 20 of them have a temperature rise of 5°C, which accounts for 40%; when the vehicle threshold (δ3) meets the following conditions: when the temperature rise is ≥15°C, and the number of fast charging in this temperature rise range accounts for 10%, the vehicle is considered to have entered the potential risk range, thereby effectively improving the comprehensiveness of the power battery safety warning.

[0049] Optionally, in one embodiment of the present application, the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value are used to generate the first target temperature parameter ratio of the target vehicle, including: obtaining the total number of frames in which the target vehicle is in a slow charging state, and determining the parameter ratio of the second maximum temperature value based on the number of frames of the second maximum temperature value and the total number of frames in the slow charging state; determining the parameter ratio of the second charging temperature difference value based on the number of frames of the second charging temperature difference value and the total number of frames in the slow charging state; determining the parameter ratio of the second temperature rise value based on the number of frames of the second temperature rise value and the total number of frames in the slow charging state; generating the first target temperature parameter ratio of the target vehicle based on the parameter ratio of the first maximum temperature value, the parameter ratio of the first charging temperature difference value, the parameter ratio of the first temperature rise value, the parameter ratio of the second maximum temperature value, the parameter ratio of the second charging temperature difference value and the parameter ratio of the second temperature rise value.

[0050] For example, Figure 2As shown, the embodiment of the present application can count the maximum temperature of each cell in each frame of the vehicle slow charging state according to the above steps, and calculate the proportion of the number of frames in each maximum temperature range to the total number of frames. For example, a vehicle has a total of 10,000 frames in the slow charging state, and a total of 3,000 frames when the maximum temperature value of the cell is 20°C, then the proportion is 30%; when the vehicle threshold (δ4) meets the following conditions: when the maximum temperature is ≥45°C, and the number of frames in the maximum temperature range accounts for 20%, it is considered that the vehicle enters the potential risk range;

[0051] Next, the proportion of the number of frames in each charging temperature difference range to the total number of frames can also be calculated according to the above steps. For example, a vehicle has 10,000 frames in the slow charging state, and 7,000 frames when the charging temperature difference is 2°C, then the proportion is 70%; when the vehicle threshold (δ5) meets the following conditions: when the temperature difference is ≥5°C, the number of frames in this temperature difference range accounts for 10%, then the vehicle is considered to have entered the potential risk range;

[0052] Secondly, the proportion of the number of slow charges in each temperature rise range to the total number of fast charges can also be calculated according to the above steps. For example, a vehicle has a total of 50 slow charging processes, and there are 20 slow charging processes with a temperature rise of 5°C, which accounts for 40%; when the vehicle threshold (δ6) meets the following conditions: when the temperature rise is ≥5°C, and the number of fast charges in this temperature rise range accounts for 10%, the vehicle is considered to have entered the potential risk range;

[0053] Among them, the embodiment of the present application can generate the first target temperature parameter ratio of the target vehicle according to the parameter ratio of the first highest temperature value, the parameter ratio of the first charging temperature difference value, the parameter ratio of the first temperature rise value, the parameter ratio of the second highest temperature value, the parameter ratio of the second charging temperature difference value and the parameter ratio of the second temperature rise value. The embodiment of the present application can determine whether the vehicle enters the potential risk range according to the first target temperature parameter ratio, and issue a safety warning when the vehicle enters the potential risk range.

[0054] In step S103, the first box plot, the second box plot and the third box plot corresponding to the second target maximum temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging status are obtained, and the target risk level of the target vehicle is determined based on the first box plot, the second box plot, the third box plot and the proportion of the first target temperature parameter, so as to generate a power battery safety warning signal for the target vehicle according to the target risk level.

[0055] In the embodiment of the present application, since the ambient temperature of the operating area where the vehicle is located is different, the temperature performance of the vehicle's temperature sensor will also be different. Therefore, it is necessary to divide the vehicle's operating area, and calculate abnormal vehicles based on the vehicles in the same area. First, the embodiment of the present application can obtain the second target maximum temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the area where the vehicle is located under the historical charging status.

[0056] For example, Figure 2 As shown, the embodiment of the present application can calculate the maximum temperature in the same area: select data from the past three months, extract the single cell maximum temperature field of each frame, calculate the maximum temperature of the fast charging process based on each vehicle and each fast charging process, determine the first box plot through the box plot method, and identify the vehicle corresponding to the upper edge value of the maximum temperature (recorded as threshold δ7).

[0057] Secondly, the maximum temperature difference in the same area can also be calculated: select data from the past three months, extract the single cell maximum temperature and single cell minimum temperature fields of each frame, and calculate the charging temperature difference of each frame of the vehicle's fast charging state, that is: charging temperature difference = single cell maximum temperature - single cell minimum temperature. Take each vehicle and each fast charging process as a unit to calculate the maximum charging temperature difference of the fast charging process. Determine the second box plot through the box plot method to identify vehicles that exceed the upper edge value of the charging temperature difference (recorded as threshold δ8).

[0058] Thirdly, the maximum temperature rise in the same area can also be calculated: select data from the past three months, extract the maximum cell temperature field of each frame, and calculate the temperature rise of the fast charging process based on each vehicle and each fast charging process, that is: temperature rise = maximum cell temperature during fast charging - maximum cell temperature corresponding to the first frame of the fast charging process. Calculate the maximum temperature rise of the fast charging process based on each vehicle and each fast charging process. Determine the third box plot through the box plot method to identify vehicles corresponding to the upper edge value of the temperature rise (recorded as threshold δ9).

[0059] Finally, the embodiment of the present application can determine the target risk level of the target vehicle, for example, low risk, medium risk or high risk, based on the first box plot, the second box plot, the third box plot and the proportion of the first target temperature parameter, so that a power battery safety warning signal can be generated for the vehicle according to the corresponding risk level, wherein the warning signal can be a visual warning, i.e., an indicator light on the dashboard or an information prompt on the display screen; an auditory warning, i.e., a buzzer or other sound alarm; an electronic notification, i.e., a warning information sent to the owner or maintenance center through the vehicle communication system, effectively improving the reliability and safety of the battery system.

[0060] Optionally, in one embodiment of the present application, the target risk level of the target vehicle is determined based on the first box plot, the second box plot, the third box plot and the first target temperature parameter ratio, including: detecting whether the target vehicle meets the target potential risk condition; when it is detected that the target vehicle meets the target potential risk condition, determining the target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot and the first target temperature parameter ratio.

[0061] For example, Figure 3 As shown, the embodiment of the present application can detect whether the vehicle meets the target potential risk conditions in the above steps. For example, in combination with the potential risks in the above steps, the embodiment of the present application can be considered from the perspective of calculation of a single vehicle. Fast charging and slow charging involve a total of 6 threshold indicators, namely δ1, δ2, δ3, δ4, δ5, and δ6, among which: 3 indicators for fast charging + 3 indicators for slow charging or 3 indicators for fast charging + 2 indicators for slow charging. As long as one of the above two conditions is met, it is defined as "Class 1"; 3 indicators for fast charging + 1 indicator for slow charging or 2 indicators for fast charging + 2 indicators for slow charging. As long as one of the above two conditions is met, it is defined as "Class 2"; 2 indicators for fast charging + 1 indicator for slow charging or 1 indicator for fast charging + 2 indicators for slow charging or 1 indicator for fast charging + 1 indicator for slow charging. As long as one of the above two conditions is met, it is defined as "Class 3".

[0062] Next, from the perspective of vehicle calculation in the same area, if any one of the three indicators δ7, δ8, and δ9 exceeds the threshold, it is defined as "Category 4". The embodiment of the present application can combine "Category 1", "Category 2", "Category 3" and "Category 4" to formulate three risk levels: high risk, medium risk and low risk. For example, when the risk is low, an indicator light on the dashboard or an information prompt on the display screen can be used; when the risk is medium, an alarm can be given by a buzzer or other sound; when the risk is high, while an alarm is given by a buzzer or other sound, an early warning information is sent to the owner or maintenance center through the vehicle-mounted communication system, thereby effectively improving the comprehensiveness and accuracy of the power battery safety early warning.

[0063] For example, when the risk level is high, it can be recommended to replace the module corresponding to the temperature sensor; when the risk level is medium, it can be recommended to check the module / battery cell and temperature sensor corresponding to the temperature sensor, and replace them in time if there is a problem; when the risk level is low, it can be recommended to focus on continuous observation. It should be noted that the above measures are for reference only. The formulation of treatment measures mainly depends on the properties of the battery itself and the mechanism and objective conditions of each OEM for the solution.

[0064] According to the power battery safety warning method proposed in the embodiment of the present application, the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value of the power battery of the target vehicle under the historical charging state can be used to generate the first target temperature parameter ratio, and the first box plot, the second box plot and the third box plot corresponding to the second target maximum temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging state and the first target temperature parameter ratio can be used to determine the target risk level of the target vehicle, thereby generating a power battery safety warning signal, which effectively improves the accuracy and reliability of the power battery safety warning. Therefore, the problem that the related technology only relies on the ambient temperature and fixed rules to determine the upper and lower limits of the temperature, cannot timely reflect the actual temperature performance of the vehicle under different use conditions, and reduces the accuracy and reliability of the power battery safety warning is solved.

[0065] Therefore, the embodiments of the present application can monitor the temperature changes of the battery itself based on historical data, and can also compare the temperatures of similar vehicles in the same area. The method takes into account comprehensive dimensions and avoids the problem of inaccurate warnings due to regional reasons. In addition, the embodiments of the present application can implant the warning model into equipment such as battery safety diagnostic instruments, and can perform safety warning tests while the customer is in the store for maintenance. For example, if an abnormal vehicle is found through warning detection, different processing measures can be taken immediately to avoid repeated bookings for vehicles to enter the store, thereby improving customer experience while ensuring vehicle safety; the model can also be deployed on a cloud monitoring platform to achieve cloud-based warnings, and report to after-sales service according to different warning levels to take timely processing measures.

[0066] Next, the safety warning device for a power battery proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0067] Figure 4 It is a block diagram of a safety warning device for a power battery according to an embodiment of the present application.

[0068] like Figure 4 As shown, the safety warning device 10 of the power battery includes: an acquisition module 100 , a generation module 200 and a warning module 300 .

[0069] Specifically, the acquisition module 100 is used to acquire a first target maximum temperature value, a first target charging temperature difference value, and a first target temperature rise value of a power battery of a target vehicle under a historical charging state.

[0070] The generating module 200 is used to generate a first target temperature parameter ratio of a target vehicle by using a first target maximum temperature value, a first target charging temperature difference value and a first target temperature rise value.

[0071] The early warning module 300 is used to obtain the first box plot, the second box plot and the third box plot corresponding to the second target maximum temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging status, and determine the target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot and the proportion of the first target temperature parameter, so as to generate a safety early warning signal for the power battery for the target vehicle according to the target risk level.

[0072] Optionally, in one embodiment of the present application, the acquisition module 100 includes: a first extraction unit, a second extraction unit and a third extraction unit.

[0073] Among them, the first extraction unit is used to extract the maximum temperature field of the single cell in each frame of the power battery during fast charging when the historical charging state is the fast charging state, and determine the first maximum temperature value of the single cell in each frame of the target vehicle in the fast charging state according to the maximum temperature field of the single cell in each frame during fast charging.

[0074] The second extraction unit is used to extract the single cell maximum temperature value and the single cell minimum temperature field of each frame during fast charging when the historical charging state is the fast charging state, and calculate the first charging temperature difference value of each frame when the target vehicle is in the fast charging state according to the single cell maximum temperature value and the single cell minimum temperature field of each frame during fast charging.

[0075] The third extraction unit is used to extract the maximum temperature value of the single cell in each frame during fast charging when the historical charging state is the fast charging state, and calculate the first temperature rise value of the target vehicle in the fast charging state according to the maximum temperature value of the single cell in each frame during fast charging.

[0076] Optionally, in one embodiment of the present application, the generation module 200 includes: a first acquisition unit, a first determination unit and a second determination unit.

[0077] Among them, the first acquisition unit is used to obtain the total number of frames in which the target vehicle is in a fast charging state, and determine the parameter proportion of the first highest temperature value according to the number of frames of the first highest temperature value and the total number of frames.

[0078] The first determining unit is used to determine the parameter ratio of the first charging temperature difference value by using the frame number of the first charging temperature difference value and the total frame number of the fast charging state.

[0079] The second determining unit is used to determine the parameter proportion of the first temperature rise value by using the frame number of the first temperature rise value and the total frame number of the fast charging state.

[0080] Optionally, in one embodiment of the present application, the acquisition module 100 includes: a fourth extraction unit, a fifth extraction unit and a sixth extraction unit.

[0081] Among them, the fourth extraction unit is used to extract the maximum temperature field of the single cell in each frame of the power battery during slow charging when the historical charging state is a slow charging state, and determine the second maximum temperature value of the single cell in each frame of the target vehicle in the slow charging state based on the maximum temperature field of the single cell in each frame during slow charging.

[0082] The fifth extraction unit is used to extract the single cell maximum temperature value and the single cell minimum temperature field of each frame during slow charging when the historical charging state is a slow charging state, and calculate the second charging temperature difference value of each frame of the target vehicle in the slow charging state based on the single cell maximum temperature value and the single cell minimum temperature field of each frame during slow charging.

[0083] The sixth extraction unit is used to extract the maximum temperature value of each cell in each frame during slow charging when the historical charging state is a slow charging state, and calculate the second temperature rise value of the target vehicle in the slow charging state according to the maximum temperature value of each cell in each frame during slow charging.

[0084] Optionally, in one embodiment of the present application, the generating module 200 includes: a second acquiring unit, a third determining unit, a fourth determining unit and a generating unit.

[0085] Among them, the second acquisition unit is used to obtain the total number of frames in which the target vehicle is in a slow charging state, and determine the parameter proportion of the second highest temperature value according to the number of frames of the second highest temperature value and the total number of frames in the slow charging state.

[0086] The third determining unit is used to determine the parameter ratio of the second charging temperature difference value according to the frame number of the second charging temperature difference value and the total frame number of the slow charging state.

[0087] The fourth determining unit is used to determine the parameter proportion of the second temperature rise value according to the number of frames of the second temperature rise value and the total number of frames in the slow charging state.

[0088] A generating unit is used to generate a first target temperature parameter ratio of the target vehicle according to the parameter ratio of the first maximum temperature value, the parameter ratio of the first charging temperature difference value, the parameter ratio of the first temperature rise value, the parameter ratio of the second maximum temperature value, the parameter ratio of the second charging temperature difference value and the parameter ratio of the second temperature rise value.

[0089] Optionally, in one embodiment of the present application, the early warning module 300 includes: a detection unit and an early warning unit.

[0090] Among them, the detection unit is used to detect whether the target vehicle meets the target potential risk conditions.

[0091] The early warning unit is used to determine the target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot and the first target temperature parameter ratio when it is detected that the target vehicle meets the target potential risk condition.

[0092] It should be noted that the above explanation of the embodiment of the safety warning method for a power battery is also applicable to the safety warning device for a power battery of this embodiment, and will not be repeated here.

[0093] According to the power battery safety warning device proposed in the embodiment of the present application, the first target maximum temperature value, the first target charging temperature difference value and the first target temperature rise value of the power battery of the target vehicle under the historical charging state can be used to generate the first target temperature parameter ratio, and the first box plot, the second box plot and the third box plot corresponding to the second target maximum temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging state and the first target temperature parameter ratio can be used to determine the target risk level of the target vehicle, thereby generating a power battery safety warning signal, which effectively improves the accuracy and reliability of the power battery safety warning. Therefore, the problem that the related technology only relies on the ambient temperature and fixed rules to determine the upper and lower limits of the temperature, cannot timely reflect the actual temperature performance of the vehicle under different use conditions, and reduces the accuracy and reliability of the power battery safety warning is solved.

[0094] Figure 5 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0095] A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0096] When the processor 502 executes the program, the power battery safety warning method provided in the above embodiment is implemented.

[0097] Furthermore, the vehicle also includes:

[0098] The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0099] The memory 501 is used to store computer programs that can be executed on the processor 502 .

[0100] The memory 501 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0101] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0102] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0103] The processor 502 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0104] This embodiment also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the above-mentioned power battery safety warning method is implemented.

[0105] This embodiment also provides a computer program product, including a computer program, which, when executed, is used to implement the above power battery safety warning method.

[0106] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0107] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0108] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0109] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0110] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0111] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0112] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0113] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A safety early warning method for a power battery, characterized in that: The following steps are involved: Obtaining a first target maximum temperature value, a first target charging temperature difference value, and a first target temperature rise value of a power battery of a target vehicle under a historical charging state; Generate a first target temperature parameter ratio of the target vehicle by using the first target maximum temperature value, the first target charging temperature difference value, and the first target temperature rise value; Obtain a first box plot, a second box plot, and a third box plot corresponding to the second target maximum temperature value, the second target charging temperature difference value, and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging state, and determine the target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot, and the first target temperature parameter ratio, so as to generate a power battery safety warning signal for the target vehicle according to the target risk level.

2. The method according to claim 1, characterized in that The obtaining of a first target maximum temperature value, a first target charging temperature difference value, and a first target temperature rise value of a power battery of a target vehicle under a historical charging state includes: When the historical charging state is a fast charging state, extracting the maximum temperature field of each cell in each frame of the power battery during fast charging, and determining the first maximum temperature value of each cell in each frame of the target vehicle in the fast charging state according to the maximum temperature field of each cell in each frame during fast charging; When the historical charging state is the fast charging state, extracting the single cell maximum temperature value and the single cell minimum temperature field of each frame during the fast charging, and calculating the first charging temperature difference value of each frame of the target vehicle in the fast charging state according to the single cell maximum temperature value and the single cell minimum temperature field of each frame during the fast charging; When the historical charging state is the fast charging state, the maximum temperature value of each cell in each frame during the fast charging is extracted, and the first temperature rise value of the target vehicle in the fast charging state is calculated according to the maximum temperature value of each cell in each frame during the fast charging.

3. The method according to claim 2, characterized in that The step of generating a first target temperature parameter ratio of the target vehicle by using the first target maximum temperature value, the first target charging temperature difference value, and the first target temperature rise value includes: Obtaining a total number of frames in which the target vehicle is in the fast charging state, and determining a parameter proportion of the first highest temperature value according to the number of frames of the first highest temperature value and the total number of frames; Determine the parameter ratio of the first charging temperature difference value by using the frame number of the first charging temperature difference value and the total frame number of the fast charging state; The parameter ratio of the first temperature rise value is determined by using the number of frames of the first temperature rise value and the total number of frames in the fast charging state.

4. The method according to claim 2, characterized in that: The obtaining of a first target maximum temperature value, a first target charging temperature difference value, and a first target temperature rise value of a power battery of a target vehicle under a historical charging state includes: When the historical charging state is a slow charging state, extracting the maximum temperature field of the single cell of each frame of the power battery during slow charging, and determining the second maximum temperature value of the single cell of each frame of the target vehicle in the slow charging state according to the maximum temperature field of the single cell of each frame during slow charging; When the historical charging state is the slow charging state, extracting the maximum temperature value and the minimum temperature field of each frame of the slow charging, and calculating the second charging temperature difference value of each frame of the target vehicle in the slow charging state according to the maximum temperature value and the minimum temperature field of each frame of the slow charging; When the historical charging state is the slow charging state, the maximum temperature value of each cell in each frame during the slow charging is extracted, and the second temperature rise value of the target vehicle in the slow charging state is calculated according to the maximum temperature value of each cell in each frame during the slow charging.

5. The method according to claim 4, characterized in that The step of generating a first target temperature parameter ratio of the target vehicle by using the first target maximum temperature value, the first target charging temperature difference value, and the first target temperature rise value includes: Obtaining a total number of frames in which the target vehicle is in the slow charging state, and determining a parameter proportion of the second highest temperature value according to the number of frames of the second highest temperature value and the total number of frames in the slow charging state; Determine a parameter ratio of the second charging temperature difference value according to the number of frames of the second charging temperature difference value and the total number of frames in the slow charging state; Determine the parameter proportion of the second temperature rise value according to the number of frames of the second temperature rise value and the total number of frames in the slow charging state; The first target temperature parameter ratio of the target vehicle is generated according to the parameter ratio of the first maximum temperature value, the parameter ratio of the first charging temperature difference value, the parameter ratio of the first temperature rise value, the parameter ratio of the second maximum temperature value, the parameter ratio of the second charging temperature difference value and the parameter ratio of the second temperature rise value.

6. The method according to claim 1, characterized in that The determining the target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot, and the first target temperature parameter ratio includes: Detecting whether the target vehicle meets the target potential risk condition; When it is detected that the target vehicle meets the target potential risk condition, the target risk level of the target vehicle is determined based on the first box plot, the second box plot, the third box plot and the first target temperature parameter ratio.

7. A safety warning device for a power battery, characterized in that: include: An acquisition module, used to acquire a first target maximum temperature value, a first target charging temperature difference value, and a first target temperature rise value of a power battery of a target vehicle under a historical charging state; A generating module, configured to generate a first target temperature parameter ratio of the target vehicle by using the first target maximum temperature value, the first target charging temperature difference value, and the first target temperature rise value; The early warning module is used to obtain the first box plot, the second box plot and the third box plot corresponding to the second target maximum temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the area where the target vehicle is located under the historical charging state, and determine the target risk level of the target vehicle based on the first box plot, the second box plot, the third box plot and the first target temperature parameter ratio, so as to generate a safety early warning signal for the power battery for the target vehicle according to the target risk level.

8. The device according to claim 7, characterized in that The acquisition module comprises: A first extraction unit is used to extract the maximum temperature field of each cell in each frame of the power battery during fast charging when the historical charging state is a fast charging state, and determine the first maximum temperature value of the cell in each frame of the target vehicle in the fast charging state according to the maximum temperature field of each cell in each frame during fast charging; A second extraction unit is used to extract the maximum temperature value and the minimum temperature field of each frame of the fast charging when the historical charging state is the fast charging state, and calculate the first charging temperature difference value of each frame of the target vehicle in the fast charging state according to the maximum temperature value and the minimum temperature field of each frame of the fast charging; The third extraction unit is used to extract the maximum temperature value of the single cell in each frame during fast charging when the historical charging state is the fast charging state, and calculate the first temperature rise value of the target vehicle in the fast charging state according to the maximum temperature value of the single cell in each frame during fast charging.

9. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the safety warning method for a power battery as described in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the safety warning method for a power battery as described in any one of claims 1 to 6.

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