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

Abstract

The application 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 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; determining a target risk level of the target vehicle by using a first target temperature parameter proportion, a first box plot, a second box plot and a third box plot corresponding to second target maximum temperature values, second target charging temperature difference values and second target temperature rise values of all vehicles in a region where the target vehicle is located under the historical charging state, so as to generate a power battery safety early warning signal. Therefore, the problem that the temperature upper limit and the temperature lower limit are determined only by relying on the environmental temperature and fixed rules in the related art, the real temperature performance of the vehicle under different use conditions cannot be reflected in time, and the reliability of the power battery safety early warning is reduced is solved.

Description

TECHNICAL FIELD

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

[0002] In recent years, with the increasing sales of new energy vehicles, vehicle thermal runaway events have also increased, and the safety problem of the battery has become increasingly prominent. Through power battery safety warning before thermal runaway occurs, abnormality can be identified in advance, and measures can be taken in time to avoid thermal runaway risks. Temperature is one of the key factors that vehicles focus on, and plays an important role in safety warning.

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

[0004] However, in the related art, only the environmental temperature and fixed rules are relied on to determine the upper and lower limits of the temperature, the running state of the vehicle is not fully considered, the real 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 are reduced, which needs to be solved urgently. SUMMARY

[0005] The present application provides a safety warning method and device for a power battery, a vehicle and a storage medium to solve the problem that in the related art, only the environmental temperature and fixed rules are relied on to determine the upper and lower limits of the temperature, the running state of the vehicle is not fully considered, the real 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 are reduced.

[0006] The first aspect embodiment of the application provides a safety warning method of a power battery, 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 in a historical charging state; generating a first target temperature parameter proportion 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; obtaining a first box plot, a second box plot and a third box plot corresponding to a second target maximum temperature value, a second target charging temperature difference value and a second target temperature rise value of all vehicles in a region where the target vehicle is located in 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 proportion, so as to generate a power battery safety warning signal of the target vehicle according to the target risk level.

[0007] Optionally, in an embodiment of the 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 in the historical charging state are obtained, comprising: when the historical charging state is a fast charging state, extracting a single cell maximum temperature field of each frame during fast charging of the power battery, and determining a first maximum temperature value of each frame of single cell 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 a single cell maximum temperature value and a single cell minimum temperature field of each frame during fast charging, and calculating a 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 a single cell maximum temperature value of each frame during fast charging, and calculating a 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 an embodiment of the 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 proportion of the target vehicle, comprising: obtaining a total frame number of the target vehicle in the fast charging state, and determining a parameter proportion of the first maximum temperature value according to a frame number of the first maximum temperature value and the total frame number; determining a parameter proportion of the first charging temperature difference value by using a frame number of the first charging temperature difference value and the total frame number of the fast charging state; and determining a parameter proportion of the first temperature rise value by using a frame number of the first temperature rise value and the total frame number of the fast charging state.

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

[0010] Optionally, in an embodiment of the present application, the generating the 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 comprises: obtaining a total number of frames of the target vehicle in the slow charging state, and determining a parameter ratio of the second maximum temperature value according to the number of frames of the second maximum temperature value and the total number of frames of the slow charging state; determining 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 of the slow charging state; determining a parameter ratio of the second temperature rise value according to the number of frames of the second temperature rise value and the total number of frames of the slow charging state; and generating the 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.

[0011] Optionally, in an embodiment of the present application, 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 comprises: detecting whether the target vehicle satisfies a target potential risk condition; and in a case where it is detected that the target vehicle satisfies 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] The second aspect embodiment of the application provides a safety warning device of a power battery, comprising: an acquisition module, configured 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 in a historical charging state; a generation module, configured to generate a first target temperature parameter proportion 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; and a warning module, configured to acquire a first box plot, a second box plot and a third box plot corresponding to second target maximum temperature values, second target charging temperature difference values and second target temperature rise values of all vehicles in a region where the target vehicle is located in 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 proportion, so as to generate a safety warning signal of the power battery of the target vehicle according to the target risk level.

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

[0014] Optionally, in an embodiment of the application, the generation module comprises: a first acquisition unit, configured to acquire a total frame number when the target vehicle is in the fast charging state, and determine a parameter proportion of the first maximum temperature value according to the frame number of the first maximum temperature value and the total frame number; a first determination unit, configured to determine a parameter proportion of the first charging temperature difference value according to the frame number of the first charging temperature difference value and the total frame number of the fast charging state; and a second determination unit, configured to determine a parameter proportion of the first temperature rise value according to the frame number of the first temperature rise value and the total frame number of the fast charging state.

[0015] Optionally, in an embodiment of the present application, the obtaining module comprises: a fourth extraction unit, configured to extract a single highest temperature field of each frame during slow charging when the historical charging state is a slow charging state, and determine a second highest temperature value of a single cell of each frame when the target vehicle is in the slow charging state according to the single highest temperature field of each frame during slow charging; a fifth extraction unit, configured to extract a single highest temperature value and a single lowest temperature field of each frame during slow charging when the historical charging state is the slow charging state, and calculate a second charging temperature difference value of each frame when the target vehicle is in the slow charging state according to the single highest temperature value and the single lowest temperature field of each frame during slow charging; and a sixth extraction unit, configured to extract a single highest temperature value of each frame during slow charging when the historical charging state is the slow charging state, and calculate a second temperature rise value of the target vehicle in the slow charging state according to the single highest temperature value of each frame during slow charging.

[0016] Optionally, in an embodiment of the present application, the generating module comprises: a second obtaining unit, configured to obtain a total number of frames when the target vehicle is in the slow charging state, and determine 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; a third determining unit, configured to determine a parameter proportion 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; a fourth determining unit, configured to determine a 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; and a generating unit, configured to generate the first target temperature parameter proportion of the target vehicle according to 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 an embodiment of the present application, the pre-warning module comprises: a detecting unit, configured to detect whether the target vehicle satisfies a target potential risk condition; and a pre-warning unit, configured to 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 proportion, when it is detected that the target vehicle satisfies the target potential risk condition.

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

[0019] The fourth aspect of the present application provides a computer readable storage medium storing a computer program, which is executed by a processor to implement the safety warning method of the power battery.

[0020] The fifth aspect of the present application provides a computer program product comprising a computer program, which is executed to implement the safety warning method of the power battery.

[0021] The embodiments of the present application can generate the first target temperature parameter proportion by 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 in the historical charging state, and determine the target risk level of the target vehicle by using 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 region where the target vehicle is located in the historical charging state and the first target temperature parameter proportion, thereby generating the power battery safety warning signal, effectively improving the accuracy and reliability of the power battery safety warning. Therefore, the problems that the temperature upper limit and the temperature lower limit are determined only by relying on the environmental temperature and the fixed rules in the related art, the real 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 are reduced are solved.

[0022] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, wherein:

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

[0025] Figure 2 A logic diagram of a safety warning of a power battery of one specific embodiment of the present application is provided.

[0026] Figure 3 A risk level logic diagram of a safety warning of one specific embodiment of the present application is provided.

[0027] Figure 4 A structural schematic diagram of a safety warning device of a power battery according to an embodiment of the present application is provided.

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

[0029] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, in which the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0030] The safety warning method, device, vehicle and storage medium of the power battery of the embodiments of the present application are described below with reference to the accompanying drawings. In view of the problems in the related art mentioned in the background art that only rely on the environmental temperature and fixed rules to determine the upper and lower limits of the temperature, which cannot timely reflect the real temperature performance of the vehicle under different use conditions, and reduce the accuracy and reliability of the safety warning of the power battery, the present application provides a safety warning method of a power battery. In the method, 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 proportion, and the first target temperature parameter proportion can be determined by using 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 region where the target vehicle is located under the historical charging state. The target risk level of the target vehicle is determined, thereby generating a power battery safety warning signal, which effectively improves the accuracy and reliability of the safety warning of the power battery. Thus, the problems in the related art that only rely on the environmental temperature and fixed rules to determine the upper and lower limits of the temperature, which cannot timely reflect the real temperature performance of the vehicle under different use conditions, and reduce the accuracy and reliability of the safety warning of the power battery are solved.

[0031] Specifically, Figure 1 A flowchart of a safety warning method of a power battery provided by an embodiment of the present application is shown.

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

[0033] In step S101, 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 are obtained.

[0034] In the embodiments of the present application, the target vehicle is a vehicle for detecting the safety of the power battery; the historical charging state of the power battery can include the historical fast charging state and the historical slow charging state.

[0035] It can be understood that the embodiment of the 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 in 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, so that the safety of the power battery can be detected according to the historical charging temperature of the power battery, and the executability of the power battery safety warning is effectively improved.

[0036] It should be noted that the embodiment of the application can extract a target data segment from the power battery operation data: the operation process includes a charging process, and the charging process generally looks at the vehicle state flag, and selects the data of the charging flag code; if there is no state flag, the current and the change of the battery state of charge can be referred to, and as the time increases, the battery state of charge presents a continuous rise in the presence of current, indicating that it is in a charging state. Each vehicle needs to be saved independently for each charging process, so as to calculate the temperature elements of the charging process subsequently;

[0037] Next, the embodiment of the application can exclude abnormal data in advance: due to some data abnormal values caused by data uploading and other reasons during the operation of the vehicle, such as null value, 0 or temperature sensing value exceeding the normal range of related characteristic parameters, for example, the temperature sensing is 702℃, since the parameters of each vehicle model of each vehicle enterprise are different, the strategy of the battery management system is different, and therefore the fixed value is also different, which is not limited here.

[0038] Optionally, in an embodiment of the application, obtaining 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 in the historical charging state comprises: when the historical charging state is a fast charging state, extracting the single maximum temperature field of each frame during fast charging of the power battery, and determining the first maximum temperature value of each frame of the single battery of the target vehicle in the fast charging state according to the single maximum temperature field of each frame during fast charging; when the historical charging state is a fast charging state, extracting the single maximum temperature value and the single minimum temperature field of each frame during fast charging, and calculating the first charging temperature difference value of each frame according to the single maximum temperature value and the single minimum temperature field of each frame during fast charging; when the historical charging state is a fast charging state, extracting the single 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 maximum temperature value of each frame during fast charging.

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

[0040] In actual implementation, such as Figure 2 As shown, in this embodiment, when the historical charging state is fast charging, for example, by selecting charging data from the past three months, the highest temperature field of each cell in each frame of the power battery during fast charging is extracted, and the first highest temperature value of each cell in each frame of the vehicle during fast charging is determined based on the highest temperature field of each cell in each frame. Next, this embodiment can also extract the highest temperature value and lowest temperature field of each cell in each frame of fast charging, and calculate the first charging temperature difference value of each frame of the target vehicle during fast charging based on the highest temperature value and lowest temperature field of each cell in each frame, that is: first charging temperature difference value = highest temperature value of each cell in fast charging - lowest temperature value of each cell in fast charging. Furthermore, this embodiment can also extract the highest temperature value of each cell in each frame of fast charging, and calculate the first temperature rise value of the vehicle during fast charging based on the highest temperature value of each cell in each frame, calculating the temperature rise value of the process on a per-vehicle-per-fast-charging-process basis, that is: first temperature rise value = highest temperature value of each cell in fast charging process - highest temperature value of each cell in the first frame of the fast-charging process, thereby effectively improving the accuracy of power battery safety warning.

[0041] Optionally, in one embodiment of this application, obtaining 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 historical charging conditions includes: when the historical charging condition is slow charging, extracting the highest temperature field of each cell in each frame of the power battery during slow charging, and determining the second maximum temperature value of each cell in each frame of the target vehicle under slow charging based on the highest temperature field of each cell in each frame of the slow charging; when the historical charging condition is slow charging, extracting the highest temperature value and the lowest temperature field of each cell in each frame of the slow charging, and calculating the second charging temperature difference value of each frame of the target vehicle under slow charging based on the highest temperature value and the lowest temperature field of each cell in each frame of the slow charging; when the historical charging condition is slow charging, extracting the highest temperature value of each cell in each frame of the slow charging, and calculating the second temperature rise value of the target vehicle under slow charging based on the highest temperature value of each cell in each frame of the slow charging.

[0042] As one possible way to achieve this, such as Figure 2As shown, the embodiment of the present application can take the charging data of the last three months when the historical charging state is the slow charging state, extract the single highest temperature field of each frame during the slow charging of the power battery, and determine the second highest temperature value of the single frame of the vehicle in the slow charging state according to the single highest temperature field of each frame during the slow charging. Then, the single highest temperature value and the single lowest temperature field of each frame during the slow charging are extracted, and the second charging temperature difference value of each frame of the vehicle in the slow charging state is calculated according to the single highest temperature value and the single lowest temperature field of each frame during the slow charging, that is, the second charging temperature difference value = the single highest temperature value in the slow charging state - the single lowest temperature value in the slow charging state. In addition, the single highest temperature value of each frame during the slow charging can also be extracted, and the second temperature rise value of the vehicle in the slow charging state is calculated according to the single highest temperature value of each frame during the slow charging, that is, the second temperature rise value = the single highest temperature value in the slow charging process - the single highest temperature value corresponding to the first frame in the slow charging process, thereby effectively improving the robustness and reliability of the safety warning of the power battery.

[0043] In step S102, the first target temperature parameter ratio of the target vehicle is generated by using the first target highest 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 generate the first target temperature parameter ratio of the target vehicle by using the first target highest temperature value, the first target charging temperature difference value and the first target temperature rise value in the following steps, wherein the first target highest temperature value includes the first highest temperature value and the second highest 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 according to the first target temperature parameter ratio of the target vehicle, and can perform safety warning of the power battery when the vehicle is an abnormal vehicle, thereby effectively improving the safety of the vehicle.

[0045] Optionally, in an embodiment of the present application, the first target temperature parameter ratio of the target vehicle is generated by using the first target highest temperature value, the first target charging temperature difference value and the first target temperature rise value, which includes: obtaining the total frame number of the target vehicle in the fast charging state, and determining the parameter ratio of the first highest temperature value according to the frame number of the first highest temperature value and the total frame number; determining 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; and determining the parameter ratio 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.

[0046] For example, as shown in FIG. 6, the first target temperature parameter ratio of the target vehicle is generated by using the first target highest temperature value, the first target charging temperature difference value and the first target temperature rise value. Figure 2As shown, the embodiments of the present application can count the single highest temperature of each frame of the vehicle fast charging state according to the above steps, calculate the proportion of the frame number of each highest temperature range to the total frame number, for example, there are 10000 frames in the fast charging state of a vehicle, and there are 3000 frames when the single highest temperature value is 20℃, so the proportion is 30%; when the vehicle threshold (δ1) meets the following conditions: when the single highest temperature value is ≥50℃, the frame number of the highest temperature range is 20%, it is considered that the vehicle enters the potential risk range;

[0047] Then, the frame number of each charging temperature difference range to the total frame number can also be calculated according to the above steps, for example, there are 10000 frames in the fast charging state of a vehicle, and there are 7000 frames when the charging temperature difference is 2℃, so the proportion is 70%; when the vehicle threshold (δ2) meets the following conditions: when the charging temperature difference is ≥5℃, the frame number of the charging temperature difference range is 10%, it is considered that the vehicle enters the potential risk range;

[0048] Secondly, the proportion of the number of fast charging processes in each temperature rise range to the total number of fast charging processes can also be calculated according to the above steps, for example, there are 50 fast charging processes of a vehicle, and there are 20 fast charging processes with a temperature rise of 5℃, so the proportion is 40%; when the vehicle threshold (δ3) meets the following conditions: when the temperature rise is ≥15℃, the number of fast charging processes in the temperature rise range is 10%, it is considered that the vehicle enters the potential risk range, thereby effectively improving the comprehensiveness of the safety warning of the power battery.

[0049] Optionally, in an embodiment of the present application, the first target temperature parameter proportion of the target vehicle is generated by using the first target highest temperature value, the first target charging temperature difference value and the first target temperature rise value, including: obtaining the total frame number of the target vehicle in the slow charging state, and determining the parameter proportion of the second highest temperature value according to the frame number of the second highest temperature value and the total frame number of the slow charging state; determining the parameter proportion 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; determining the parameter proportion of the second temperature rise value according to the frame number of the second temperature rise value and the total frame number of the slow charging state; and generating the first target temperature parameter proportion of the target vehicle according to 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.

[0050] For example, as shown in FIG. 6, the first target temperature parameter proportion of the target vehicle is generated by using the first target highest temperature value, the first target charging temperature difference value and the first target temperature rise value, including: obtaining the total frame number of the target vehicle in the slow charging state, and determining the parameter proportion of the second highest temperature value according to the frame number of the second highest temperature value and the total frame number of the slow charging state; determining the parameter proportion 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; determining the parameter proportion of the second temperature rise value according to the frame number of the second temperature rise value and the total frame number of the slow charging state; and generating the first target temperature parameter proportion of the target vehicle according to 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. Figure 2As shown, the embodiments of the present application can calculate the proportion of the number of frames in each highest temperature range to the total number of frames according to the above steps, for example, there are 10000 frames in the slow charging state of a vehicle, and there are 3000 frames when the highest temperature value of the single body is 20℃, so the proportion is 30%; when the vehicle threshold (δ4) meets the following conditions: when the highest temperature is greater than or equal to 45℃, the proportion of the number of frames in the highest temperature range is 20%, it is considered that the vehicle enters the potential risk range;

[0051] Then, 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, there are 10000 frames in the slow charging state of a vehicle, and there are 7000 frames when the charging temperature difference is 2℃, so the proportion is 70%; when the vehicle threshold (δ5) meets the following conditions: when the temperature difference is greater than or equal to 5℃, the proportion of the number of frames in the temperature difference range is 10%, it is considered that the vehicle enters the potential risk range;

[0052] Secondly, the proportion of the number of slow charging in each temperature rise range to the total number of fast charging can also be calculated according to the above steps, for example, there are 50 slow charging processes of a vehicle, and there are 20 slow charging processes with a temperature rise of 5℃, so the proportion is 40%; when the vehicle threshold (δ6) meets the following conditions: when the temperature rise is greater than or equal to 5℃, the proportion of the number of fast charging in the temperature rise range is 10%, it is considered that the vehicle enters the potential risk range;

[0053] Among them, the embodiments of the present application can generate the first target temperature parameter proportion of the target vehicle according to 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, the embodiments of the present application can determine whether the vehicle enters the potential risk range according to the first target temperature parameter proportion, and perform 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 highest temperature value, the second target charging temperature difference value and the second target temperature rise value of all vehicles in the historical charging state in the region where the target vehicle is located 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 first target temperature parameter proportion, 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 running area where the vehicle is located is different, the temperature performance of the vehicle temperature sensor will also be different, therefore, the running area of the vehicle needs to be divided, and based on the vehicles in the same area, the abnormal vehicle is calculated. 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 historical charging state in the area where the vehicle is located.

[0056] For example, as shown in Figure 2 The embodiment of the present application can perform the same area maximum temperature calculation: selecting the data of the last three months, extracting the single maximum temperature field of each frame, calculating the maximum temperature of the fast charging process in units of each fast charging process of each vehicle, determining the first box plot by the box plot method, and identifying the vehicle corresponding to the upper edge value of the maximum temperature (denoted as threshold δ7) which exceeds the maximum temperature.

[0057] Secondly, the same area maximum temperature difference calculation can also be performed: selecting the data of the last three months, extracting the single maximum temperature and single minimum temperature fields of each frame, calculating the charging temperature difference of each frame of the vehicle in the fast charging state, that is, the charging temperature difference = single maximum temperature-single minimum temperature, calculating the maximum charging temperature difference of the fast charging process in units of each fast charging process of each vehicle, determining the second box plot by the box plot method, and identifying the vehicle corresponding to the upper edge value of the charging temperature difference (denoted as threshold δ8) which exceeds the charging temperature difference.

[0058] Thirdly, the same area maximum temperature rise calculation can also be performed: selecting the data of the last three months, extracting the single maximum temperature field of each frame, calculating the temperature rise of the fast charging process in units of each fast charging process of each vehicle, that is, temperature rise = single maximum temperature in the fast charging process-single maximum temperature corresponding to the first frame in the fast charging process, calculating the maximum temperature rise of the fast charging process in units of each fast charging process of each vehicle, determining the third box plot by the box plot method, and identifying the vehicle corresponding to the upper edge value of the temperature rise (denoted as threshold δ9) which exceeds the temperature rise.

[0059] Finally, the embodiment of the present application can 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 proportion, for example, low risk, medium risk or high risk, so as to generate a power battery safety warning signal for the vehicle according to the corresponding risk level, wherein the warning signal can be a visual warning, that is, an indicator light on the instrument panel or an information prompt on the display screen; an auditory warning, that is, a buzzer or other sound alarm; an electronic notification, that is, a warning information sent to the vehicle owner or maintenance center through the vehicle-mounted communication system, effectively improving the reliability and safety of the battery system.

[0060] Optionally, in an embodiment of the present application, based on the first box plot, the second box plot, the third box plot and the first target temperature parameter proportion, the target risk level of the target vehicle is determined, comprising: detecting whether the target vehicle satisfies the target potential risk condition; in the case that it is detected that the target vehicle satisfies the target potential risk condition, based on the first box plot, the second box plot, the third box plot and the first target temperature parameter proportion, the target risk level of the target vehicle is determined.

[0061] For example, as shown in the following table, Figure 3 For example, as shown in the following table,

[0062] For example, as shown in the following table,

[0063] For example, as shown in the following table,

[0064] According to the safety warning method of the power battery provided in the embodiment of the present application, the first target temperature parameter proportion can be generated by 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 the target risk level of the target vehicle can be determined by using 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 region where the target vehicle is located and the first target temperature parameter proportion, so as to generate the power battery safety warning signal, thereby effectively improving the accuracy and reliability of the power battery safety warning. Therefore, the problems in the related art that the temperature upper limit and the temperature lower limit are determined only by relying on the environmental temperature and the fixed rules, the real 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 are reduced are solved.

[0065] Therefore, the embodiment of the present application can monitor the temperature change of the battery based on the historical data, and can also compare the same type of temperature based on the vehicles in the same region. The method considers comprehensive dimensions, avoids the problem of inaccurate warning due to regional reasons, and in addition, the warning model can be implanted into the battery safety diagnostic instrument and other devices. The safety warning test can be performed at the same time during the customer maintenance process in the store. For example, if an abnormal vehicle is found through the warning detection, different processing measures can be taken immediately to avoid repeated vehicle visits to the store, improve the customer experience, and ensure vehicle safety. The model can also be deployed on a cloud monitoring platform to realize cloud warning and report to the after-sales department for timely processing measures according to different warning levels.

[0066] Secondly, the safety warning device of the power battery according to the embodiment of the present application is described with reference to the accompanying drawings.

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

[0068] As Figure 4 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 configured to acquire 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.

[0070] The generation module 200 is configured to generate the first target temperature parameter proportion 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.

[0071] The early warning module 300 is configured to acquire 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 historical charging state in the region where the target vehicle is located, 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 proportion, so as to generate a safety warning signal of the power battery of the target vehicle according to the target risk level.

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

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

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

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

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

[0077] The first acquisition unit is configured to acquire a total frame number when the target vehicle is in the fast charging state, and determine a parameter proportion of the first maximum temperature value according to the frame number of the first maximum temperature value and the total frame number.

[0078] The first determination unit is configured to determine a parameter proportion 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 determination unit is configured to determine a 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 an embodiment of the present application, the acquisition module 100 comprises a fourth extraction unit, a fifth extraction unit and a sixth extraction unit.

[0081] The fourth extraction unit is configured to extract a single highest temperature field of each frame during slow charging when the historical charging state is the slow charging state, and determine a second highest temperature value of the single cell of each frame in which the target vehicle is in the slow charging state according to the single highest temperature field of each frame during slow charging.

[0082] The fifth extraction unit is configured to extract a single highest temperature value and a single lowest temperature field of each frame during slow charging when the historical charging state is the slow charging state, and calculate a second charging temperature difference value of each frame in which the target vehicle is in the slow charging state according to the single highest temperature value and the single lowest temperature field of each frame during slow charging.

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

[0084] Optionally, in an embodiment of the present application, the generation module 200 comprises a second acquisition unit, a third determination unit, a fourth determination unit and a generation unit.

[0085] The second acquisition unit is configured to acquire a total frame number in which the target vehicle is in the slow charging state, and determine a parameter proportion of the second highest temperature value according to the frame number of the second highest temperature value and the total frame number in the slow charging state.

[0086] The third determination unit is configured to determine a parameter proportion of the second charging temperature difference value according to the frame number of the second charging temperature difference value and the total frame number in the slow charging state.

[0087] The fourth determination unit is configured to determine a parameter proportion of the second temperature rise value according to the frame number of the second temperature rise value and the total frame number in the slow charging state.

[0088] The generation unit is configured to generate a first target temperature parameter proportion of the target vehicle according to 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.

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

[0090] The detection unit is configured to detect whether the target vehicle meets a target potential risk condition.

[0091] The early warning unit is configured to 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 proportion when it is detected that the target vehicle meets the target potential risk condition.

[0092] It should be noted that the foregoing explanation of the safety warning method for the power battery also applies to the safety warning device for the power battery of this embodiment, which will not be described here.

[0093] The safety warning device for the power battery provided by the embodiment of the present application can generate the first target temperature parameter proportion by 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 determine the target risk level of the target vehicle by using 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 region where the target vehicle is located under the historical charging state and the first target temperature parameter proportion, so as to generate the power battery safety warning signal, thereby effectively improving the accuracy and reliability of the power battery safety warning. Therefore, the problems in the related art that only rely on the environmental temperature and fixed rules to determine the upper and lower limits of the temperature, which cannot timely reflect the real temperature performance of the vehicle under different use conditions, and reduce the accuracy and reliability of the power battery safety warning are solved.

[0094] Figure 5 The vehicle provided by the embodiment of the present application is shown in the structural diagram. The vehicle can include:

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

[0096] The processor 502 implements the safety warning method for the power battery provided in the above embodiments when executing the program.

[0097] Further, the vehicle further 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 the computer program executable on the processor 502.

[0100] The memory 501 can include a high-speed RAM memory, and can also include a 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 with each other through a bus and complete communication between 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, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 5 Only one thick line is used to represent the bus in the figure, but it 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 complete communication between each other through an internal interface.

[0103] The processor 502 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement one or more embodiments of the present application.

[0104] The embodiment further provides a computer readable storage medium, having stored thereon a computer program, which, when executed by a processor, implements the power battery safety warning method as above.

[0105] The embodiment further provides a computer program product, comprising a computer program, which, when executed by a processor, is used to implement the power battery safety warning method as above.

[0106] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, the usage of "N" means at least two, for example, two, three or the like, unless explicitly stated otherwise.

[0107] Furthermore, the terms "first", "second", or the like, are used merely as a designation of certain elements or features, and do not imply or connote relative importance or a specific order of categorization of the indicated features. Accordingly, features described as "first" or "second" can be explicitly or implicitly included in at least one of the features. In the description of the application, the term "N" means at least two, for example, two, three, etc., unless explicitly stated otherwise.

[0108] Any process or method descriptions or blocks in flow charts or otherwise described herein represent embodiments which can be managed as one or more modules, segments, or portions of code which include one or more executable instructions for implementing specific logic functions or steps, and alternate implementations are possible. In some embodiments, the processes and methods described can be executably encoded on a machine- readable medium in a data signal embodied in an electromagnetic signal, a wireless signal, or a propagated signal.

[0109] The logic and / or steps represented in flow diagrams or otherwise described herein, for example, can be considered as a sequence of executable instructions, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a product of the manufacturing and / or processing. The computer-readable medium can include, but is not limited to, the following: an electronic connection (an electronic device with one or N wires), a portable computer diskette (a magnetic device), a RAM (random access memory), a ROM (read-only memory), an EPROM (erasable programmable ROM) or a Flash memory, an optical fiber, and a portable CD ROM. In addition, the computer-readable medium can even be paper or other suitable medium upon which the program is printed, as the program can be electronically captured, via the optically scanning of the paper or other suitable medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and stored in the computer memory.

[0110] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As such, if implemented in hardware and in another embodiment, the implementation can be carried out using any or a combination of the following technologies, which are all well known in the art: discrete logic circuitry having logic gates for implementing logic functions upon an application of data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0111] Those of skill in the art would understand that the steps carried out by the above-mentioned embodiments can be implemented by a program instructing the relevant hardware to complete all or part of the steps, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one of the steps of the method embodiments or a combination thereof.

[0112] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0113] The storage medium mentioned above can 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 should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A safety warning method for a power battery, characterized in that, The method comprises 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 in a historical charging state, wherein the first target maximum temperature value comprises a first maximum temperature value and a second maximum temperature value, the first target charging temperature difference value comprises a first charging temperature difference value and a second charging temperature difference value, and the first target temperature rise value comprises a first temperature rise value and a second temperature rise value; when the historical charging state is a fast charging state, determining the first maximum temperature value of each frame of single cell of the target vehicle in the fast charging state, calculating the first charging temperature difference value of each frame of the target vehicle in the fast charging state, and calculating the first temperature rise value of the target vehicle in the fast charging state; when the historical charging state is a slow charging state, determining the second maximum temperature value of each frame of single cell of the target vehicle in the slow charging state, calculating the second charging temperature difference value of each frame of the target vehicle in the slow charging state, and calculating the second temperature rise value of the target vehicle in the slow charging state; 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, wherein the generating the 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 comprises: determining a parameter ratio of the first maximum temperature value, determining a parameter ratio of the first charging temperature difference value, determining a parameter ratio of the first temperature rise value, determining a parameter ratio of the second maximum temperature value, determining a parameter ratio of the second charging temperature difference value, determining a parameter ratio of the second temperature rise value, and generating the 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; 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 a region where the target vehicle is located in 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.

2. The method of claim 1, wherein, 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 in the historical charging state comprises: when the historical charging state is a fast charging state, extracting a single cell maximum temperature field of each frame during fast charging of the power battery, and determining the first maximum temperature value of each frame of single cell 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, the single highest temperature value and the single lowest temperature field of each frame during the fast charging are extracted, and a first charging temperature difference value of each frame when the target vehicle is in the fast charging state is calculated according to the single highest temperature value and the single lowest temperature field of each frame during the fast charging; When the historical charging state is the fast charging state, the single highest temperature value of each frame during the fast charging is extracted, and a first temperature rise value when the target vehicle is in the fast charging state is calculated according to the single highest temperature value of each frame during the fast charging.

3. The method of claim 2, wherein, The generating the first target temperature parameter ratio of the target vehicle by using the first target highest temperature value, the first target charging temperature difference value and the first target temperature rise value comprises: obtaining the total frame number when the target vehicle is in the fast charging state, and determining the parameter ratio of the first highest temperature value according to the frame number of the first highest temperature value and the total frame number; determining the parameter ratio of the first charging temperature difference value according to the frame number of the first charging temperature difference value and the total frame number of the fast charging state; determining the parameter ratio of the first temperature rise value according to the frame number of the first temperature rise value and the total frame number of the fast charging state.

4. The method of claim 2, wherein, The obtaining the first target highest temperature value, the first target charging temperature difference value and the first target temperature rise value of the power battery of the target vehicle in the historical charging state comprises: When the historical charging state is the slow charging state, the single highest temperature field of each frame during the slow charging of the power battery is extracted, and a second highest temperature value of each frame when the target vehicle is in the slow charging state is determined according to the single highest temperature field of each frame during the slow charging; When the historical charging state is the slow charging state, the single highest temperature value and the single lowest temperature field of each frame during the slow charging are extracted, and a second charging temperature difference value of each frame when the target vehicle is in the slow charging state is calculated according to the single highest temperature value and the single lowest temperature field of each frame during the slow charging; When the historical charging state is the slow charging state, the single highest temperature value of each frame during the slow charging is extracted, and a second temperature rise value when the target vehicle is in the slow charging state is calculated according to the single highest temperature value of each frame during the slow charging.

5. The method of claim 4, wherein, The generating the first target temperature parameter ratio of the target vehicle by using the first target highest temperature value, the first target charging temperature difference value and the first target temperature rise value comprises: obtaining the total frame number when the target vehicle is in the slow charging state, and determining the parameter ratio of the second highest temperature value according to the frame number of the second highest temperature value and the total frame number of the slow charging state; determining 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; determining the parameter ratio of the second temperature rise value according to the frame number of the second temperature rise value and the total frame number of the slow charging state. The first target temperature parameter ratio of the target vehicle is generated according to a parameter ratio of the first highest temperature value, a parameter ratio of the first charging temperature difference value, a parameter ratio of the first temperature rise value, a parameter ratio of the second highest temperature value, a parameter ratio of the second charging temperature difference value, and a parameter ratio of the second temperature rise value.

6. The method of claim 1, wherein, 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 a target potential risk condition; In a case where it is detected that the target vehicle meets the target potential risk condition, 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.

7. A safety warning device for a power battery, characterized in that, including: an acquisition module, configured to acquire 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, wherein the first target highest temperature value includes a first highest temperature value and a second highest temperature value, the first target charging temperature difference value includes a first charging temperature difference value and a second charging temperature difference value, and the first target temperature rise value includes a first temperature rise value and a second temperature rise value, in a case where the historical charging state is a fast charging state, determining the first highest temperature value of each frame of a single body of the target vehicle in the fast charging state, calculating the first charging temperature difference value of each frame of the target vehicle in the fast charging state, and calculating the first temperature rise value of the target vehicle in the fast charging state, in a case where the historical charging state is a slow charging state, determining the second highest temperature value of each frame of a single body of the target vehicle in the slow charging state, calculating the second charging temperature difference value of each frame of the target vehicle in the slow charging state, and calculating the second temperature rise value of the target vehicle in the slow charging state; a generation module, configured to generate a first target temperature parameter ratio of the target vehicle by using the first target highest temperature value, the first target charging temperature difference value, and the first target temperature rise value, wherein the generation of the first target temperature parameter ratio of the target vehicle by using the first target highest temperature value, the first target charging temperature difference value, and the first target temperature rise value includes: determining a parameter ratio of the first highest temperature value, determining a parameter ratio of the first charging temperature difference value, determining a parameter ratio of the first temperature rise value, determining a parameter ratio of the second highest temperature value, determining a parameter ratio of the second charging temperature difference value, determining a parameter ratio of the second temperature rise value, and generating 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 early warning module is configured to acquire 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 region where the target vehicle is located in 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 proportion, so as to generate a safety early warning signal of the power battery of the target vehicle according to the target risk level.

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

9. A vehicle characterized by comprising: The memory, the processor and the computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the safety early warning method of the power battery according to any one of claims 1-6. The program is executed by the processor to implement the safety early warning method of the power battery according to any one of claims 1-6.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, ​

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