Early warning information generation method and device, equipment and storage medium

Abstract

Embodiments of the present application provide a kind of early warning information generation method, device, equipment and storage medium, involve vehicle technical field.The method comprises: the total voltage of battery pack, the total current of the battery pack, the voltage information and current information of each battery monomer in the battery pack, the detection temperature value of the detection temperature value of the battery temperature probe, the detection temperature value of switch temperature probe and the detection temperature value of connector temperature probe in the battery pack are obtained One or more of them, detect abnormal information;According to abnormal information, generate early warning information.The method can improve the accuracy of the early warning information generated.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a method, apparatus, device and storage medium for generating early warning information. Background Technology

[0002] With the rapid development of electric vehicle technology, users have increasingly higher requirements for the safety of vehicle battery packs. Currently, vehicle safety systems can generate safety warnings for the battery pack by collecting information. Users can then address vehicle malfunctions based on these warnings to resolve potential safety hazards and improve the safety of the vehicle battery pack.

[0003] In existing technologies, temperature changes in the battery pack are collected by temperature sensors; based on these temperature changes, safety warning information for the battery pack is generated, thus enabling early warning of thermal runaway in the battery pack.

[0004] However, existing methods for generating early warning information have at least the following technical problems: Since the battery pack is warned of thermal runaway based on temperature changes, the temperature change information is relatively simple and cannot accurately predict safety warning information in various scenarios, resulting in poor accuracy of the generated safety warning information. Summary of the Invention

[0005] This application provides a method, apparatus, device, and storage medium for generating early warning information, which can improve the accuracy of the generated safety early warning information.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] Firstly, this application provides a method for generating early warning information, the method comprising:

[0008] The system acquires one or more of the following: the total voltage of the battery pack, the total current of the battery pack, the voltage and current information of each individual battery cell in the battery pack, the temperature value detected by the cell temperature probe installed in the battery pack, the temperature value detected by the switch temperature probe, and the temperature value detected by the connector temperature probe.

[0009] Based on the voltage and current information of each battery cell in the battery pack, detect abnormal information of the battery cell, and / or, based on the temperature value detected by the cell temperature probe, detect abnormal information of the cell temperature, and / or, based on the temperature value detected by the switch temperature probe, detect abnormal information of the switch temperature, and / or, based on the temperature value detected by the connector temperature probe, detect abnormal information of the connector temperature probe, and / or, based on the temperature values ​​detected by the switch temperature probe and the cell temperature probe, detect abnormal information of the switch temperature probe, and / or, based on the temperature values ​​detected by the connector temperature probe and the cell temperature probe, detect abnormal information of the connector temperature probe, and / or, based on the total voltage and total current of the battery pack, detect abnormal information of the external circuit.

[0010] An early warning message is generated based on one or more of the following abnormal information: abnormal information of the battery cell, abnormal information of the battery cell temperature, abnormal information of the switch temperature, abnormal information of the connector temperature, abnormal information of the switch temperature probe, abnormal information of the connector temperature probe, and abnormal information of the external circuit.

[0011] Optionally, the voltage information includes multiple voltage values ​​collected within a preset time period, and the current information includes multiple current values ​​collected within a preset time period; correspondingly, the step of detecting abnormal information of individual battery cells based on the voltage and current information of each individual battery cell in the battery pack includes:

[0012] When the battery pack is in an unused state, the voltage change value of each battery cell is determined within a preset time period based on the voltage value collected each time. If the voltage change value of a battery cell drops below a first preset voltage within 1 second and lasts for 4 seconds or more, the battery cell is marked as abnormal (A). If the voltage change value of a battery cell rises above a first preset voltage within 1 second and lasts for 4 seconds or more, the battery cell is marked as abnormal (B). If the voltage value of a battery cell exceeds a second preset voltage and lasts for 5 seconds or more, the battery cell is marked as abnormal (B). The battery cell abnormality information is C; the battery pack is in a charging or discharging state. Based on the voltage and current values ​​of each battery cell collected each time, the resistance value of each battery cell collected this time is determined; a first ratio of the maximum resistance value and the minimum resistance value collected this time is determined. If the difference between the first ratio and the second ratio of the maximum resistance value and the minimum resistance value collected last time is greater than a first preset value and less than a second preset value, and the duration is greater than or equal to 4 seconds, then the battery cell abnormality information is marked as D; if the difference is greater than or equal to the second preset value and the duration is greater than or equal to 2 seconds, then the battery cell abnormality information is marked as S.

[0013] Optionally, the number of cell temperature probes is a first preset number; correspondingly, the step of detecting abnormal cell temperature information based on the detected temperature value of the cell temperature probe includes:

[0014] Based on the temperature values ​​detected by the cell temperature probes, the maximum and minimum detected temperature values ​​are selected from a first preset number of cell temperature probes. The temperature difference between the maximum and minimum detected temperature values ​​is determined according to a preset cycle. If the maximum detected temperature value is greater than the first detected temperature value, a cell temperature anomaly is marked as E, where the first detected temperature value is a preset cell temperature protection value minus 3 degrees Celsius. If the maximum detected temperature value is greater than the second detected temperature value, a cell temperature anomaly is marked as F, where the second detected temperature value is a preset cell temperature protection value plus 5 degrees Celsius. If the difference between the current maximum detected temperature value and the previous maximum detected temperature value is large... If the temperature difference is less than 2 degrees Celsius and the duration is greater than or equal to 3 seconds, the cell temperature abnormality information is marked as G; if the current temperature difference is greater than 30 degrees Celsius and the duration is greater than or equal to 4 seconds, the cell temperature abnormality information is marked as H; if the difference between the current temperature difference and the previous temperature difference is greater than 2 degrees Celsius and the duration is greater than or equal to 3 seconds, the cell temperature abnormality information is marked as I; if the cell temperature probe detects a temperature value greater than 120 degrees Celsius, the cell temperature probe is determined to be short-circuited; if the cell temperature probe detects a temperature value less than -40 degrees Celsius, the cell temperature probe is determined to be open-circuited; if the cell temperature probe is short-circuited or open-circuited, the cell temperature abnormality information is marked as J.

[0015] Optionally, the step of detecting abnormal switch temperature information based on the detected temperature value of the switch temperature probe includes: if the detected temperature value of the switch temperature probe is greater than a third detected temperature value, then the abnormal switch temperature information is marked as K, wherein the third detected temperature value is a preset switch temperature protection value minus 3 degrees Celsius; if the detected temperature value of the switch temperature probe is greater than a fourth detected temperature value, then the abnormal switch temperature information is marked as L, wherein the fourth detected temperature value is a preset switch temperature protection value plus 3 degrees Celsius; if the difference between the detected temperature value of the current switch temperature probe and the detected temperature value of the previous switch temperature probe is greater than 3 degrees Celsius, and the duration is greater than or equal to 5 seconds, then the abnormal switch temperature information is marked as M; if there is a detected temperature value of the switch temperature probe greater than 120 degrees Celsius, then the switch temperature probe is determined to be short-circuited; if there is a detected temperature value of the switch temperature probe less than -40 degrees Celsius, then the switch temperature probe is determined to be open-circuited; if there is a short circuit or open circuit of the switch temperature probe, then the abnormal switch temperature information is marked as N.

[0016] Optionally, the step of detecting connector temperature abnormality information based on the detected temperature value of the connector temperature probe includes: if the detected temperature value of the connector temperature probe is greater than a fifth detected temperature value, then the connector temperature abnormality information is marked as O, wherein the fifth detected temperature value is a preset connector temperature protection value minus 3 degrees Celsius; if the detected temperature value of the connector temperature probe is greater than a sixth detected temperature value, then the connector temperature abnormality information is marked as P, wherein the sixth detected temperature value is a preset connector temperature protection value plus 3 degrees Celsius; if the difference between the current detected temperature value of the connector temperature probe and the previous detected temperature value of the connector temperature probe is greater than 3 degrees Celsius, and the duration is greater than or equal to 5 seconds, then the connector temperature abnormality information is marked as Q; if there is a detected temperature value of the connector temperature probe greater than 120 degrees Celsius, then the connector temperature probe is determined to be short-circuited; if there is a detected temperature value of the connector temperature probe less than -40 degrees Celsius, then the connector temperature probe is determined to be open-circuited; if there is a short circuit or open circuit of the connector temperature probe, then the connector temperature abnormality information is marked as T.

[0017] Optionally, the step of detecting abnormal information of the switch temperature probe based on the detected temperature value of the switch temperature probe and the detected temperature value of the cell temperature probe, and detecting abnormal information of the connector temperature probe based on the detected temperature value of the connector temperature probe and the detected temperature value of the cell temperature probe, and detecting abnormal information of the external circuit based on the total voltage and total current of the battery pack, includes: determining the temperature value of the switch temperature probe based on the sum of the detected temperature value of the switch temperature probe and a first temperature value; determining the temperature value of the cell temperature probe based on the sum of the maximum detected temperature value of the cell temperature probe and the first temperature value; and detecting abnormal information of the external circuit based on the ratio of the temperature value of the switch temperature probe to the temperature value of the cell temperature probe. The system displays abnormal information about the switch temperature probe; and determines the temperature value of the connector temperature probe based on the sum of the detected temperature value of the connector temperature probe and the first temperature value; determines the temperature value of the battery cell temperature probe based on the sum of the maximum detected temperature value of the battery cell temperature probe and the first temperature value; detects abnormal information about the connector temperature probe based on the ratio of the temperature value of the connector temperature probe to the temperature value of the battery cell temperature probe; and records the ratio of the total voltage to the total current once per second, for N times; determines the rate of change between the Nth ratio and each of the previous N-1 ratios; if the total current is greater than 5 amperes, and the rate of change between the Nth ratio and each of the previous N-1 ratios is less than 101 and greater than 99, then marks the external circuit abnormal information as Y.

[0018] Optionally, generating warning information based on one or more of the abnormal information among the battery cell abnormality information, the switch temperature abnormality information, the connector temperature abnormality information, the switch temperature probe abnormality information, the connector temperature probe abnormality information, and the external circuit abnormality information includes: determining the warning type based on one or more of the abnormal information among the battery cell abnormality information, the switch temperature abnormality information, the connector temperature abnormality information, the switch temperature probe abnormality information, the connector temperature probe abnormality information, and the external circuit abnormality information; and generating warning information based on the warning type.

[0019] Secondly, this application provides an early warning information generation device, the device comprising:

[0020] The acquisition module is used to acquire one or more of the following: the total voltage of the battery pack, the total current of the battery pack, the voltage and current information of each battery cell in the battery pack, the detection temperature value of the cell temperature probe installed in the battery pack, the detection temperature value of the switch temperature probe, and the detection temperature value of the connector temperature probe.

[0021] The detection module is used to detect abnormal information of individual battery cells based on the voltage and current information of each battery cell in the battery pack, and / or to detect abnormal information of battery cell temperature based on the temperature value detected by the cell temperature probe, and / or to detect abnormal information of switch temperature based on the temperature value detected by the switch temperature probe, and / or to detect abnormal information of connector temperature based on the temperature value detected by the connector temperature probe, and / or to detect abnormal information of switch temperature probe based on the temperature values ​​detected by the switch temperature probe and the cell temperature probe, and / or to detect abnormal information of connector temperature probe based on the temperature values ​​detected by the connector temperature probe and the cell temperature probe, and / or to detect abnormal information of external circuit based on the total voltage and total current of the battery pack.

[0022] The generation module is used to generate warning information based on one or more of the abnormal information from the battery cell abnormal information, the cell temperature abnormal information, the switch temperature abnormal information, the connector temperature abnormal information, the switch temperature probe abnormal information, the connector temperature probe abnormal information, and the external circuit abnormal information.

[0023] Thirdly, this application provides an electronic device, including: a processor, a communication interface, and a memory, wherein the processor is communicatively connected to the communication interface and the memory respectively;

[0024] The memory stores computer-executed instructions;

[0025] The communication interface communicates and interacts with external devices.

[0026] The processor executes computer execution instructions stored in the memory to implement the warning information generation method as described in any one of the first aspects.

[0027] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the warning information generation method as described in any one of the first aspects.

[0028] The warning information generation method, apparatus, device, and storage medium provided in this application include: acquiring one or more of the following: the total voltage of the battery pack, the total current of the battery pack, the voltage and current information of each battery cell within the battery pack, the detected temperature value of a cell temperature probe, a switch temperature probe, and a connector temperature probe installed within the battery pack; detecting abnormal information; and generating warning information based on the abnormal information. By utilizing abnormal information from multiple dimensions, including battery cell temperature, cell temperature, switch temperature, connector temperature, switch temperature probe, and connector temperature probe, the generated warning information achieves high accuracy, thereby improving vehicle safety. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] Figure 1 This is a schematic diagram illustrating an application scenario of an early warning information generation method provided in an embodiment of this application;

[0031] Figure 2 A flowchart illustrating a method for generating early warning information provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the structure of an early warning information generation device provided in an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0034] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0036] With the rapid development of electric two-wheeler technology, users have increasingly higher requirements for the safety of vehicle battery packs. Currently, vehicle safety systems can generate safety warnings for the battery pack by collecting information. Users can then address vehicle malfunctions based on these warnings to resolve potential safety hazards and improve the safety of the vehicle battery pack.

[0037] In existing technologies, temperature sensors are used to collect temperature changes in the battery pack. Based on these temperature changes, safety warning information for the battery pack is generated, thus enabling thermal runaway warnings. However, because thermal runaway warnings for battery pack safety are based on temperature changes, and this temperature change information is relatively singular, it cannot accurately predict safety warning information under various scenarios. Therefore, the accuracy of the generated safety warning information is poor.

[0038] Therefore, improving the accuracy of generated security warning information is a technical problem that urgently needs to be solved.

[0039] To address the aforementioned technical problems, the inventors proposed the following technical concept: Generating battery warning information based on one or more of the following abnormal information: battery cell abnormality information, cell temperature abnormality information, switch temperature abnormality information, connector temperature abnormality information, switch temperature probe abnormality information, connector temperature probe abnormality information, and external circuit abnormality information. In other words, by utilizing abnormal information from multiple dimensions, including battery cell temperature, cell temperature, switch temperature, connector temperature, switch temperature probe, and connector temperature probe, the accuracy of the generated warning information is improved.

[0040] Optionally, firstly, one or more of the following are acquired: the total voltage of the battery pack, the total current of the battery pack, the voltage and current information of each individual battery cell within the battery pack, the temperature values ​​detected by cell temperature probes, the temperature values ​​detected by switch temperature probes, and the temperature values ​​detected by connector temperature probes. Then, based on the voltage and current information of each individual battery cell within the battery pack, abnormal information of the individual battery cells is detected; and / or, based on the temperature values ​​detected by the cell temperature probes, abnormal information of the cell temperature is detected; and / or, based on the temperature values ​​detected by the switch temperature probes, abnormal information of the switch temperature is detected; and / or, based on the temperature values ​​detected by the connector temperature probes, abnormal information of the switch temperature probes is detected; and / or, based on the temperature values ​​detected by the connector temperature probes and the cell temperature probes, abnormal information of the connector temperature probes is detected; and / or, based on the total voltage and total current of the battery pack, abnormal information of the external circuit is detected. Finally, based on one or more abnormal information from the following categories—battery cell abnormal information, cell temperature abnormal information, switch temperature abnormal information, connector temperature abnormal information, switch temperature probe abnormal information, connector temperature probe abnormal information, and external circuit abnormal information—a battery warning message is generated.

[0041] In this embodiment of the disclosure, since warning information is generated based on one or more of the abnormal information from battery cell abnormality information, cell temperature abnormality information, switch temperature abnormality information, connector temperature abnormality information, switch temperature probe abnormality information, connector temperature probe abnormality information, and external circuit abnormality information, the accuracy of the battery warning information generated from abnormal information from multiple dimensions such as battery cell, cell temperature, switch temperature, connector temperature, switch temperature probe, and connector temperature probe is relatively high, thereby improving vehicle safety.

[0042] The application scenarios of the early warning information generation method provided in this application are described below. Figure 1 This is a schematic diagram illustrating an application scenario of a warning information generation method provided in an embodiment of this application. For example... Figure 1As shown, this scenario includes an electric vehicle and a vehicle-to-everything (V2X) big data platform. The electric vehicle can be equipped with a vehicle warning device and a display screen. The vehicle warning device can upload abnormal information (e.g., abnormal information about individual battery cells, cell temperatures, switch temperatures, connector temperatures, switch temperature probes, connector temperature probes, and external circuits) to the V2X big data platform. Based on one or more of these abnormal information, the V2X big data platform generates a warning message. Then, the V2X big data platform returns the warning message to the vehicle warning device, which then transmits it to the display screen. Finally, the warning message is displayed on the electric vehicle's screen to alert the user.

[0043] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0044] Figure 2 This is a flowchart illustrating a method for generating early warning information provided in an embodiment of this application. Figure 2 As shown, the method may include:

[0045] S201. Obtain the total voltage of the battery pack, the total current of the battery pack, the voltage and current information of each battery cell in the battery pack, the detection temperature value of the cell temperature probe installed in the battery pack, the detection temperature value of the switch temperature probe, and the detection temperature value of the connector temperature probe.

[0046] In this embodiment of the disclosure, the battery pack may include multiple battery cells. The number of battery cells within the battery pack is not specifically limited in this embodiment. Optionally, different models of battery packs may deploy different numbers of battery cells.

[0047] The battery pack can be in an uninstalled state or installed on a vehicle that is not in use, in which case the battery pack is in an unused state. The battery pack can also be in a charging or discharging state.

[0048] Optionally, when the battery pack is in an unused state, the total voltage of the battery pack, the total current of the battery pack, and the voltage information of each individual battery cell in the battery pack (also known as the resting voltage) can be obtained.

[0049] Optionally, when in a charging or discharging state, the voltage information (also known as non-static voltage) and current information of each battery cell in the battery pack can be obtained.

[0050] For example, the number of battery cells deployed in the battery pack is n; the voltage information of each battery cell can be represented as Vc1, Vc2, ..., Vcn; where n represents the number of battery cells in series. The current information can be represented as I. Based on the ratio of battery cell voltage to current, the resistance of each battery cell is obtained: R1 = Vc1 / I, ..., Rn = Vcn / I.

[0051] In some embodiments, the current state of the battery pack can be determined based on the absolute value of the real-time current of the battery pack. Optionally, if the absolute value of the real-time current is less than a first current threshold, the battery pack is determined to be in an unused state; if the absolute value of the real-time current is greater than or equal to the first current threshold, the battery pack is determined to be in a charging or discharging state. In this embodiment, the value of the first current threshold is not specifically limited. For example, the first current threshold is 0.5A.

[0052] In other embodiments, the current state of the battery pack can be determined based on the average current value over a preset time period. Optionally, the preset time period is 30 seconds. The current recording information obtained over 30 seconds includes: I1, I2, ..., I30. The average current value is determined as: Iave = Ih / 30, where Ih is the sum of I1, I2, ..., I30.

[0053] Optionally, if the average current value is less than the second current threshold, the battery pack is determined to be in an unused state; if the average current value is greater than or equal to the second current threshold, the battery pack is determined to be in a charging or discharging state. In this embodiment, the value of the second current threshold is not specifically limited. For example, the first current threshold is 2A.

[0054] In this embodiment of the disclosure, the battery pack can be deployed with multiple cell temperature probes in different areas. Each cell temperature probe can detect the cell temperature of multiple individual battery cells within a certain area. For example, the detected temperature values ​​Tc1, Tc2, ..., Tcm of all cell temperature probes in the battery pack are obtained; where m represents the number of cell probes in the battery pack.

[0055] In this embodiment of the disclosure, the number of switching temperature probes is related to the number of MOS switches (Metal-Oxide-Semiconductor Field-Effect Transistors) in the battery pack. The number of connector temperature probes is the same as the number of connectors in the battery pack, usually one.

[0056] For example, the temperature value detected by a switch temperature probe can be represented as Tmos. The temperature value detected by a connector temperature probe can be represented as Tcon.

[0057] S202. Based on the voltage and current information of each battery cell in the battery pack, detect abnormal information of the battery cell; based on the temperature value detected by the cell temperature probe, detect abnormal information of the cell temperature; based on the temperature value detected by the switch temperature probe, detect abnormal information of the switch temperature; based on the temperature value detected by the connector temperature probe, detect abnormal information of the connector temperature probe; based on the temperature values ​​detected by the switch temperature probe and the cell temperature probe, detect abnormal information of the switch temperature probe; based on the temperature values ​​detected by the connector temperature probe and the cell temperature probe, detect abnormal information of the connector temperature probe; and based on the total voltage and total current of the battery pack, detect abnormal information of the external circuit.

[0058] In this embodiment of the disclosure, the voltage information includes multiple voltage values ​​collected within a preset time period, and the current information includes multiple current values ​​collected within a preset time period; correspondingly, based on the voltage and current information of each battery cell in the battery pack, abnormal information of the battery cells is detected, including:

[0059] (S11) When the battery pack is in an unused state, the voltage change value of each battery cell within a preset time period is determined based on the voltage value of each battery cell collected each time.

[0060] In this embodiment of the disclosure, the value of the preset duration is not specifically limited. For example, the preset duration can be 30 seconds.

[0061] (S12) If the voltage change value of a battery cell drops below the first preset voltage within 1 second and the duration is greater than or equal to 4 seconds, then the abnormal information of the battery cell is marked as A.

[0062] In this embodiment of the disclosure, the value of the first preset voltage is not specifically limited. For example, the first preset voltage is 50mA. In this case, if the voltage of a single battery cell drops by more than 50mV within 1 second and the duration is greater than or equal to 4 seconds, it is marked as A.

[0063] (S13) If the voltage change value of a battery cell exceeds the first preset voltage within 1 second and the duration is greater than or equal to 4 seconds, then the abnormal information of the battery cell is marked as B.

[0064] For example, the first preset voltage is 50mA. At this time, if the voltage of a single battery cell rises by more than 50mV within 1 second and lasts for more than or equal to 4 seconds, it is marked as B.

[0065] (S14) If the voltage of a battery cell is greater than the second preset voltage and the duration is greater than or equal to 5 seconds, then mark the battery cell abnormality information as C.

[0066] In this embodiment, the second preset voltage can be the single-cell overvoltage secondary protection voltage, or the single-cell overvoltage secondary protection voltage plus 100mV. The 100mV can also be replaced with other voltage values, such as 50mV, 80mV, etc.

[0067] Optionally, the secondary overvoltage protection voltage for a single cell depends on the type of battery pack. For example, if the battery pack is a lithium iron phosphate battery, the secondary overvoltage protection voltage for a single cell is 3750mV. If the battery pack is a non-lithium iron phosphate battery, the secondary overvoltage protection voltage for a single cell is 4300mV.

[0068] For example, if the voltage of a single battery cell is greater than the single cell overvoltage secondary protection voltage plus 100MV, and the duration is greater than or equal to 5 seconds, then the abnormal information of the single battery cell is marked as C.

[0069] (S15) When the battery pack is in a charging or discharging state, determine the resistance value of each battery cell collected this time based on the voltage and current values ​​of each battery cell collected each time; determine the first ratio of the maximum resistance value and the minimum resistance value collected this time.

[0070] For example, the number of battery cells deployed in the battery pack is n; the voltage information of each battery cell can be represented as Vc1, Vc2, ..., Vcn; where n represents the number of battery cells in the pack. The current information can be represented as I. Based on the ratio of battery cell voltage to current, the resistance of each battery cell is obtained: R1 = Vc1 / I, ..., Rn = Vcn / I. Among the n values ​​of R1...Rn, the minimum resistance value Rmin and the maximum resistance value Rmax are determined. The first ratio of the maximum resistance value and the minimum resistance value collected in this study is determined and denoted as: Re = Rmax / Rmin. Furthermore, the second ratio of the maximum resistance value and the minimum resistance value collected from the previous stage is backed up and denoted as: ReLast.

[0071] (S16) If the difference between the first ratio and the second ratio of the maximum and minimum resistance values ​​collected last time is greater than the first preset value and less than the second preset value, and the duration is greater than or equal to 4 seconds, then mark the abnormal information of the battery cell as D.

[0072] In this embodiment of the disclosure, the values ​​of the first preset value and the second preset value are not specifically limited. For example, the first preset value is 50 and the second preset value is 200. At this time, if there is a difference between the first ratio and the second ratio > 50 and < 200, and this change lasts for 4 seconds, it is marked as D.

[0073] (S17) If the difference is greater than or equal to the second preset value and the duration is greater than or equal to 2 seconds, then mark the abnormal information of the battery cell as S.

[0074] For example, the second preset value is 200. At this time, if there is a difference between the first ratio and the second ratio ≥ 200, and the change lasts for 2 seconds, it is marked as S.

[0075] In this embodiment of the disclosure, the number of cell temperature probes is a first preset number; correspondingly, based on the detected temperature values ​​of the cell temperature probes, abnormal cell temperature information is detected, including:

[0076] (S21) Based on the detected temperature value of the cell temperature probe, select the maximum and minimum detected temperature values ​​from the detected temperature values ​​of the first preset number of cell temperature probes, and determine the temperature difference between the maximum and minimum detected temperature values ​​according to a preset cycle.

[0077] In this embodiment, the value of the first preset quantity is not specifically limited. For example, the first preset quantity is n. At this time, the detected temperature values ​​of the n cell temperature probes are: Tc1, Tc2, ..., Tcn. The minimum detected temperature value is determined to be Tmin, and the maximum detected temperature value is determined to be Tmax; the temperature difference between the maximum and minimum detected temperature values ​​is determined to be: ΔT = Tmax - Tmin. After each round of calculation, the Tmax value of the previous second is backed up and recorded as TmaxLast; the ΔT value of the previous second is backed up and recorded as ΔTlast.

[0078] (S22) If the maximum detection temperature value is greater than the first detection temperature value, the cell temperature abnormality information is marked as E, where the first detection temperature value is the preset cell temperature protection value minus 3 degrees Celsius.

[0079] In this embodiment of the disclosure, the preset cell temperature protection value is not specifically limited. For example, the preset cell temperature protection value is 65 degrees Celsius.

[0080] For example, the preset cell temperature protection value can be marked as Tpd. In this case, if the maximum detected temperature value Tmax > (Tpd - 3℃), the cell temperature abnormality information is marked as E.

[0081] (S23) If the maximum detection temperature value is greater than the second detection temperature value, the cell temperature abnormality information is marked as F, where the second detection temperature value is the preset cell temperature protection value plus 5 degrees Celsius.

[0082] For example, if the maximum detection temperature value Tmax > (Tpd + 5℃), then the cell temperature abnormality information is marked as F.

[0083] (S24) If the temperature difference between the current maximum detected temperature value and the previous maximum detected temperature value is greater than 2 degrees Celsius, and the duration is greater than or equal to 3 seconds, then mark the cell temperature abnormality information as G.

[0084] For example, if the difference between the current maximum detected temperature value Tmax and the previous maximum detected temperature value TmaxLast is (Tmax - TmaxLast) > 2 degrees Celsius, then the cell temperature abnormality information is marked as G.

[0085] (S25) If the temperature difference is greater than 30 degrees Celsius and the duration is greater than or equal to 4 seconds, then mark the cell temperature abnormality information as H.

[0086] For example, if the temperature difference ΔT > 30 degrees Celsius and lasts for 4 seconds, then the cell temperature abnormality information is marked as H.

[0087] (S26) If the difference between the current temperature difference and the previous temperature difference is greater than 2 degrees Celsius and the duration is greater than or equal to 3 seconds, then mark the cell temperature abnormality information as I.

[0088] For example, the current temperature difference is △T, and the previous temperature difference is △Tlast. If the difference between the current temperature difference and the previous temperature difference is (△T - △Tlast) > 2 degrees Celsius and lasts for 3 seconds, then the cell temperature abnormality information is marked as I.

[0089] (S27) If the detected temperature value of the cell temperature probe is greater than 120 degrees Celsius, it is determined that the cell temperature probe is short-circuited. If the detected temperature value of the cell temperature probe is less than -40 degrees Celsius, it is determined that the cell temperature probe is open-circuited. If the cell temperature probe is short-circuited or open-circuited, the abnormal cell temperature information is marked as J.

[0090] For example, if a short circuit or open circuit exists in the cell temperature probe, the abnormal cell temperature information is marked as J. A short circuit in the cell temperature probe can be represented as Tcscd, and an open circuit in the cell temperature probe can be represented as Tcopen.

[0091] In this embodiment of the disclosure, detecting abnormal switch temperature information based on the detected temperature value of the switch temperature probe includes:

[0092] (S31) If the detected temperature value of the switch temperature probe is greater than the third detected temperature value, then mark the switch temperature abnormality information as K, where the third detected temperature value is the preset switch temperature protection value minus 3 degrees Celsius.

[0093] In this embodiment of the disclosure, the value of the preset switch temperature protection value is not specifically limited. For example, the preset switch temperature protection value is 95 degrees Celsius. The preset switch temperature protection value can be represented as Tmpd.

[0094] In some embodiments, the detected temperature value of the switching temperature probe can be acquired periodically. Optionally, the detected temperature value of the switching temperature probe acquired this time is recorded as Tmos, and the detected temperature value of the switching temperature probe acquired last time is recorded as Tmoslast.

[0095] Optionally, if the detected temperature value Tmos of the switch temperature probe is greater than (Tmpd - 3℃), then the switch temperature abnormality information is marked as K.

[0096] Optionally, if the detected temperature value Tmos of the switch temperature probe is greater than Tmpd, then the battery pack charging or discharging is prohibited, and the switch high temperature protection information is recorded.

[0097] (S32) If the detected temperature value of the switch temperature probe is greater than the fourth detected temperature value, then mark the switch temperature abnormality information as L, where the fourth detected temperature value is the preset switch temperature protection value plus 3 degrees Celsius;

[0098] For example, if the detected temperature value Tmos of the switch temperature probe is greater than (Tmpd + 3℃), then the switch temperature abnormality information is marked as L.

[0099] (S33) If the difference between the temperature value detected by the current switch temperature probe and the temperature value detected by the previous switch temperature probe is greater than 3 degrees Celsius, and the duration is greater than or equal to 5 seconds, then mark the switch temperature abnormality information as M.

[0100] For example, if the difference between the temperature value detected by the current switch temperature probe and the temperature value detected by the previous switch temperature probe is (Tmos - Tmoslast) > 3℃ and the duration is greater than or equal to 5 seconds, then the switch temperature abnormality information is marked as M.

[0101] (S34) If the detected temperature value of the switch temperature probe is greater than 120 degrees Celsius, it is determined that the switch temperature probe is short-circuited. If the detected temperature value of the switch temperature probe is less than -40 degrees Celsius, it is determined that the switch temperature probe is open-circuited. If the switch temperature probe is short-circuited or open-circuited, the switch temperature abnormality information is marked as N.

[0102] For example, Tmos represents the detected temperature value of the switch temperature probe, which has an effective range. If Tmos > 120°C, the switch temperature probe is determined to be short-circuited, and the short-circuit value Tmscd is recorded. If Tmos < -40°C, the switch temperature probe is determined to be open-circuited, and the open-circuit value Tmopen is recorded.

[0103] For example, if there is a short circuit (Tmscd) or an open circuit (Tmopen) in the switch temperature probe, the switch temperature abnormality information is marked as N.

[0104] In this embodiment of the disclosure, detecting abnormal connector temperature information based on the temperature value detected by the connector temperature probe includes:

[0105] (S41) If the temperature value detected by the connector temperature probe is greater than the fifth temperature value, the connector temperature abnormality information is marked as O, where the fifth temperature value is the preset connector temperature protection value minus 3 degrees Celsius.

[0106] In this embodiment of the disclosure, the value of the preset connector temperature protection value is not specifically limited. For example, the preset connector temperature protection value is 85 degrees Celsius. The preset connector temperature protection value can be represented as Tconpd.

[0107] In some embodiments, the detected temperature value of the connector temperature probe can be acquired periodically. Optionally, the detected temperature value of the connector temperature probe acquired this time is recorded as Tcon, and the detected temperature value of the connector temperature probe acquired last time is recorded as Tconlast.

[0108] Optionally, if the temperature value Tcon detected by the connector temperature probe is greater than (Tconpd - 3℃), then the connector temperature abnormality information is marked as O.

[0109] Optionally, if the temperature value Tcon detected by the connector temperature probe is greater than Tconpd, then charging or discharging the battery pack is prohibited, and the high temperature protection information of the connector is recorded.

[0110] (S42) If the temperature value detected by the connector temperature probe is greater than the sixth detection temperature value, then mark the connector temperature abnormality information as P, where the sixth detection temperature value is the preset connector temperature protection value plus 3 degrees Celsius.

[0111] For example, if the temperature value Tcon detected by the connector temperature probe is greater than (Tconpd + 3℃), then the connector temperature abnormality information is marked as P.

[0112] (S43) If the difference between the current temperature value detected by the connector temperature probe and the previous temperature value detected by the connector temperature probe is greater than 3 degrees Celsius and the duration is greater than or equal to 5 seconds, then the connector temperature abnormality information is marked as Q.

[0113] For example, if the difference between the current temperature value detected by the connector temperature probe and the previous temperature value detected by the connector temperature probe is (Tcon - Tconlast) > 3°C and the duration is greater than or equal to 5 seconds, then the connector temperature abnormality information is marked as Q.

[0114] (S44) If the temperature value detected by the connector temperature probe is greater than 120 degrees Celsius, the connector temperature probe is determined to be short-circuited. If the temperature value detected by the connector temperature probe is less than -40 degrees Celsius, the connector temperature probe is determined to be open-circuited. If the connector temperature probe is short-circuited or open-circuited, the connector temperature abnormality information is marked as T.

[0115] Optionally, Tcon represents the detected temperature value of the connector temperature probe, which has an effective range. If Tcon > 120°C, the connector temperature probe is determined to be short-circuited, and the short-circuit value Tconscd is recorded. If Tcon < -40°C, the connector temperature probe is determined to be open-circuited, and the open-circuit value Tconopen is recorded.

[0116] For example, if there is a short circuit (Tconscd) or an open circuit (Tconopen) in the connector temperature probe, the connector temperature abnormality information is marked as T.

[0117] In some embodiments, detecting abnormal information of the switch temperature probe based on the detected temperature value of the switch temperature probe and the detected temperature value of the cell temperature probe includes: determining the temperature value of the switch temperature probe based on the sum of the detected temperature value of the switch temperature probe and a first temperature value; determining the temperature value of the cell temperature probe based on the sum of the maximum detected temperature value of the cell temperature probe and the first temperature value; and detecting abnormal information of the switch temperature probe based on the ratio of the temperature value of the switch temperature probe to the temperature value of the cell temperature probe.

[0118] Optionally, probe malfunctions may lead to large temperature deviations, and the first temperature value is used to correct these deviations, thereby enabling the detection of abnormal results under any conditions. In this embodiment, the value of the first temperature value is not specifically limited.

[0119] For example, the first temperature value is 40℃. At this time, the temperature value of the switch temperature probe is: Tccon = Tcon + 40℃, and the temperature value of the cell temperature probe is: Tccmax = Tmax + 40℃. The ratio of the temperature value of the switch temperature probe to the temperature value of the cell temperature probe can be expressed as: Te_con_cell = Tccon / Tccmax.

[0120] The steps for detecting abnormal information from the switch temperature probe, based on the ratio of the temperature value from the switch temperature probe to the temperature value from the cell temperature probe, include:

[0121] (S51) When the battery pack is in an unused state, if the ratio of the detected temperature value of the switch temperature probe to the detected temperature value of the cell temperature probe is greater than 1.3 and the duration is greater than or equal to 10 seconds, then the abnormal information of the switch temperature probe is marked as U.

[0122] For example, when the battery pack is in an unused state, if Te_con_cell is greater than 1.3 and the duration is greater than or equal to 10 seconds, the abnormal information of the switch temperature probe is marked as U.

[0123] (S52) When the battery pack is in use, if the ratio of the temperature value detected by the temperature probe to the temperature value detected by the cell temperature probe is greater than 1.3 and the duration is greater than or equal to 10 seconds, then mark the abnormal information of the switch temperature probe as W.

[0124] For example, when the battery pack is in use, if Te_con_cell is greater than 1.3 and the duration is greater than or equal to 10 seconds, the abnormal information of the switch temperature probe is marked as U.

[0125] In some embodiments, detecting abnormal information of the connector temperature probe based on the detected temperature value of the connector temperature probe and the detected temperature value of the battery cell temperature probe includes: determining the temperature value of the connector temperature probe based on the sum of the detected temperature value of the connector temperature probe and a first temperature value; determining the temperature value of the battery cell temperature probe based on the sum of the maximum detected temperature value of the battery cell temperature probe and the first temperature value; and detecting abnormal information of the connector temperature probe based on the ratio of the temperature value of the connector temperature probe to the temperature value of the battery cell temperature probe.

[0126] For example, the first temperature value is 40℃. At this time, the temperature value of the connector temperature probe is: Tmmos = Tmos + 40℃, and the temperature value of the cell temperature probe is: Tccmax = Tmax + 40℃. The ratio of the temperature value of the connector temperature probe to the temperature value of the cell temperature probe can be expressed as: Te_mos_cell = Tmmos / Tccmax.

[0127] The steps for detecting abnormal information from the connector temperature probe, based on the ratio of the temperature value from the connector temperature probe to the temperature value from the battery cell temperature probe, include:

[0128] (S53) When the battery pack is in an unused state, if the ratio of the temperature value detected by the connector temperature probe to the temperature value detected by the cell temperature probe is greater than 1.3 and the duration is greater than or equal to 10 seconds, then the abnormal information of the connector temperature probe is marked as V.

[0129] For example, when the battery pack is in an unused state, if Te_mos_cell is greater than 1.3 and the duration is greater than or equal to 10 seconds, the connector temperature probe abnormality information is marked as U.

[0130] (S54) When the battery pack is in use, if the ratio of the temperature value detected by the connector temperature probe to the temperature value detected by the cell temperature probe is greater than 1.3 and the duration is greater than or equal to 10 seconds, then the abnormal information of the connector temperature probe is marked as X.

[0131] For example, when the battery pack is in use, if Te_mos_cell is greater than 1.3 and the duration is greater than or equal to 10 seconds, the connector temperature probe abnormality information is marked as X.

[0132] Optionally, based on the total voltage and total current of the battery pack, detect abnormal information in the external circuit, including: recording the ratio of total voltage to total current once per second, for N times; determining the rate of change between the ratio in the Nth time and the ratios in the previous N-1 times; if the total current is greater than 5 amperes, and the rate of change between the ratio in the Nth time and the ratios in the previous N-1 times is less than 101 and greater than 99, then mark the abnormal information in the external circuit as Y.

[0133] S203. Generate battery warning information based on one or more of the following abnormal information: battery cell abnormal information, switch temperature abnormal information, connector temperature abnormal information, switch temperature probe abnormal information, connector temperature probe abnormal information, and external circuit abnormal information.

[0134] In this embodiment of the disclosure, early warnings can be issued for the cell safety, process safety, and external usage safety of the battery pack based on one or more abnormal information. Accordingly, this step may include: determining the warning type based on one or more of the following abnormal information: abnormal information from individual battery cells, abnormal information from switch temperatures, abnormal information from connector temperatures, abnormal information from switch temperature probes, abnormal information from connector temperature probes, and abnormal information from external circuits; and generating warning information based on the warning type.

[0135] Optionally, the warning types include: device failure type, cell safety type, and process safety type.

[0136] Optionally, the warning information may also include a warning level. This warning level includes: Level 1 warning and Level 2 warning. A Level 1 warning indicates that thermal runaway has been triggered, while a Level 2 warning indicates that thermal runaway may be triggered.

[0137] In some embodiments, the abnormal information of a single battery cell includes A, B, C, D, and S; the abnormal information of a switch temperature includes E, F, G, H, and I; the abnormal information of a switch temperature includes K, L, M, and N; the abnormal information of a connector temperature includes O, P, Q, and T; the abnormal information of a switch temperature probe includes U and W; the abnormal information of a connector temperature probe includes V and X; and the abnormal information of an external circuit includes Y.

[0138] The step of generating early warning information based on the device failure type may include:

[0139] If the abnormal information of a single battery cell includes both A and B, then the warning information generated is: cell voltage sampling line disconnected;

[0140] If the abnormal information of a single battery cell includes S, then the warning information generated is: cell voltage sampling line disconnected;

[0141] If the abnormal cell temperature information is J, then the warning information generated is: Cell temperature probe failure;

[0142] If the abnormal switch temperature information is N, then the warning information generated is: switch temperature probe failure;

[0143] If the connector temperature anomaly information is T, then the warning information generated is: Connector temperature probe failure;

[0144] If the abnormal information of the switch temperature probe is U, then the warning information generated is: abnormal resistance of the switch temperature probe;

[0145] If the connector temperature probe abnormality information is V, then the warning information generated is: connector temperature probe resistance is abnormal.

[0146] The steps for generating warning information based on the cell safety type may include:

[0147] If the abnormal information of a single battery cell includes A and the abnormal information of cell temperature is G, then the warning information generated is: There is an internal short circuit abnormality in the cell when the battery pack is in a static state.

[0148] If the abnormal information of a single battery cell includes D and the abnormal information of the cell temperature is G, then the warning information generated is: there is an internal short circuit abnormality in the cell during the charging and discharging state of the battery pack.

[0149] If the abnormal cell temperature information is H or I, then the warning information generated is: Local cell temperature abnormality;

[0150] If the abnormal switch temperature information is M, then the warning information generated is: the switch device temperature rises too quickly;

[0151] If the abnormal information from the switch temperature probe is W, then the warning information generated is: the switch device is malfunctioning.

[0152] If the connector temperature abnormality information is Q, then the warning information generated is: Connector temperature rises too quickly;

[0153] If the connector temperature probe shows an abnormality of X, then the following warning message will be generated: Connector malfunction.

[0154] It should be noted that when the warning message indicates an internal short circuit in a cell while the battery pack is at rest or during charging / discharging, the warning message may also include a Level 1 warning, indicating that the battery pack has triggered thermal runaway. When the warning message indicates an abnormal temperature in a localized cell, the warning message may also include a Level 2 warning, indicating that the battery pack may trigger thermal runaway.

[0155] It should be noted that when the warning message indicates that the switching device or connector is overheating too quickly, the warning message may also include a Level 1 warning, indicating that the battery pack has triggered thermal runaway. When the warning message indicates that the switching device or connector is malfunctioning, the warning message may also include a Level 2 warning, indicating that the battery pack may trigger thermal runaway.

[0156] In this embodiment of the disclosure, the vehicle's safety is improved because it can provide early warnings for situations where thermal runaway has already been triggered, as well as for situations where runaway may occur. Furthermore, the warning generation method in this embodiment can also provide early warnings for thermal runaway caused by incomplete processes or disassembly / reassembly (e.g., thermal runaway caused by connector malfunctions, external connector malfunctions, etc.), thus further enhancing vehicle safety.

[0157] The steps for providing early warning of the external safety of the battery pack may include: if the external circuit abnormality information is Y, generating a warning message: there is a short circuit in the external device connected to the battery pack.

[0158] In this embodiment of the disclosure, when the battery is used as a constant load, an external short circuit of the battery pack can be detected, thereby improving vehicle safety.

[0159] In this embodiment of the disclosure, since warning information is generated based on one or more of the abnormal information from battery cell abnormality information, cell temperature abnormality information, switch temperature abnormality information, connector temperature abnormality information, switch temperature probe abnormality information, connector temperature probe abnormality information, and external circuit abnormality information, the accuracy of the warning information generated by using abnormal information from multiple dimensions such as battery cell, cell temperature, switch temperature, connector temperature, switch temperature probe, and connector temperature probe is relatively high, thereby improving vehicle safety.

[0160] Figure 3 This is a schematic diagram of a warning information generation device provided in an embodiment of this application. Figure 3 As shown, the device includes: an acquisition module 301, a detection module 302, and a generation module 303.

[0161] The acquisition module 301 is used to acquire one or more of the following: the total voltage of the battery pack, the total current of the battery pack, the voltage and current information of each battery cell in the battery pack, the detection temperature value of the cell temperature probe installed in the battery pack, the detection temperature value of the switch temperature probe, and the detection temperature value of the connector temperature probe.

[0162] The detection module 302 is used to detect abnormal information of battery cells based on the voltage and current information of each battery cell in the battery pack, and / or, detect abnormal information of battery cell temperature based on the temperature value detected by the cell temperature probe, and / or, detect abnormal information of switch temperature based on the temperature value detected by the switch temperature probe, and / or, detect abnormal information of connector temperature based on the temperature value detected by the connector temperature probe, and / or, detect abnormal information of switch temperature probe based on the temperature values ​​detected by the switch temperature probe and the cell temperature probe, and / or, detect abnormal information of connector temperature probe based on the temperature values ​​detected by the connector temperature probe and the cell temperature probe, and / or, detect abnormal information of external circuit based on the total voltage and total current of the battery pack.

[0163] The generation module 303 is used to generate warning information based on one or more of the following abnormal information: abnormal information of battery cell, abnormal information of battery cell temperature, abnormal information of switch temperature, abnormal information of connector temperature, abnormal information of switch temperature probe, abnormal information of connector temperature probe, and abnormal information of external circuit.

[0164] Optionally, the voltage information includes multiple voltage values ​​collected within a preset time period, and the current information includes multiple current values ​​collected within a preset time period. Correspondingly, the detection module 302 detects abnormal information of individual battery cells based on the voltage and current information of each battery cell within the battery pack. This includes: if the battery pack is in an unused state, determining the voltage change value of each battery cell within a preset time period based on the voltage value of each battery cell collected each time; if the voltage change value of a battery cell drops below a first preset voltage within 1 second and lasts for more than or equal to 4 seconds, then the abnormal information of the battery cell is marked as A; if the voltage change value of a battery cell rises above a first preset voltage within 1 second and lasts for more than or equal to 4 seconds, then the abnormal information of the battery cell is marked as A. A single battery cell is marked as B if its voltage is greater than the second preset voltage and the duration is greater than or equal to 5 seconds. If the battery cell voltage is greater than the second preset voltage and the duration is greater than or equal to 5 seconds, the single battery cell is marked as C. When the battery pack is charging or discharging, the resistance value of each single battery cell is determined based on the voltage and current values ​​of each single battery cell collected each time. The first ratio of the maximum resistance value to the minimum resistance value collected this time is determined. If the difference between the first ratio and the second ratio of the maximum resistance value and the minimum resistance value collected last time is greater than the first preset value and less than the second preset value and the duration is greater than or equal to 4 seconds, the single battery cell is marked as D. If the difference is greater than or equal to the second preset value and the duration is greater than or equal to 2 seconds, the single battery cell is marked as S.

[0165] Optionally, the number of cell temperature probes is a first preset number; correspondingly, the detection module 302 detects abnormal cell temperature information based on the detected temperature values ​​of the cell temperature probes, including: selecting the maximum and minimum detected temperature values ​​from the detected temperature values ​​of the first preset number of cell temperature probes, and determining the temperature difference between the maximum and minimum detected temperature values ​​according to a preset period; if the maximum detected temperature value is greater than the first detected temperature value, then the abnormal cell temperature information is marked as E, where the first detected temperature value is a preset cell temperature protection value minus 3 degrees Celsius; if the maximum detected temperature value is greater than the second detected temperature value, then the abnormal cell temperature information is marked as F, where the second detected temperature value is a preset cell temperature protection value plus 5 degrees Celsius. The temperature readings are as follows: If the difference between the current maximum detected temperature and the previous maximum detected temperature is greater than 2 degrees Celsius and the duration is greater than or equal to 3 seconds, the cell temperature is marked as abnormal as G. If the current temperature difference is greater than 30 degrees Celsius and the duration is greater than or equal to 4 seconds, the cell temperature is marked as abnormal as H. If the current temperature difference is greater than 2 degrees Celsius and the duration is greater than or equal to 3 seconds, the cell temperature is marked as abnormal as I. If the cell temperature probe detects a temperature greater than 120 degrees Celsius, the cell temperature probe is determined to be short-circuited. If the cell temperature probe detects a temperature less than -30 degrees Celsius, the cell temperature probe is determined to be open-circuited. If the cell temperature probe is short-circuited or open-circuited, the cell temperature is marked as abnormal as J.

[0166] Optionally, the detection module 302 detects abnormal switch temperature information based on the detected temperature value of the switch temperature probe, including: if the detected temperature value of the switch temperature probe is greater than a third detected temperature value, then the abnormal switch temperature information is marked as K, where the third detected temperature value is a preset switch temperature protection value minus 3 degrees Celsius; if the detected temperature value of the switch temperature probe is greater than a fourth detected temperature value, then the abnormal switch temperature information is marked as L, where the fourth detected temperature value is a preset switch temperature protection value plus 3 degrees Celsius; if the difference between the detected temperature value of the current switch temperature probe and the detected temperature value of the previous switch temperature probe is greater than 3 degrees Celsius, and the duration is greater than or equal to 5 seconds, then the abnormal switch temperature information is marked as M; if there is a detected temperature value of the switch temperature probe greater than 120 degrees Celsius, then the switch temperature probe is determined to be short-circuited; if there is a detected temperature value of the switch temperature probe less than -30 degrees Celsius, then the switch temperature probe is determined to be open-circuited; if there is a short circuit or open circuit of the switch temperature probe, then the abnormal switch temperature information is marked as N.

[0167] Optionally, the detection module 302 detects abnormal connector temperature information based on the detected temperature value of the connector temperature probe, including: if the detected temperature value of the connector temperature probe is greater than the fifth detected temperature value, then the abnormal connector temperature information is marked as O, where the fifth detected temperature value is the preset connector temperature protection value minus 3 degrees Celsius; if the detected temperature value of the connector temperature probe is greater than the sixth detected temperature value, then the abnormal connector temperature information is marked as P, where the sixth detected temperature value is the preset connector temperature protection value plus 3 degrees Celsius; if the difference between the current detected temperature value of the connector temperature probe and the previous detected temperature value of the connector temperature probe is greater than 3 degrees Celsius, and the duration is greater than or equal to 5 seconds, then the abnormal connector temperature information is marked as Q; if there is a detected temperature value of the connector temperature probe greater than 120 degrees Celsius, then the connector temperature probe is determined to be short-circuited; if there is a detected temperature value of the connector temperature probe less than -30 degrees Celsius, then the connector temperature probe is determined to be open-circuited; if there is a short circuit or open circuit of the connector temperature probe, then the abnormal connector temperature information is marked as T.

[0168] Optionally, the detection module 302 detects abnormal information of the switch temperature probe based on the detected temperature value of the switch temperature probe and the detected temperature value of the cell temperature probe; detects abnormal information of the connector temperature probe based on the detected temperature value of the connector temperature probe and the detected temperature value of the cell temperature probe; and detects abnormal information of the external circuit based on the total voltage and total current of the battery pack, including: determining the temperature value of the switch temperature probe based on the sum of the detected temperature value of the switch temperature probe and a first temperature value; determining the temperature value of the cell temperature probe based on the sum of the maximum detected temperature value of the cell temperature probe and the first temperature value; and detecting abnormal information of the switch temperature probe based on the ratio of the temperature value of the switch temperature probe to the temperature value of the cell temperature probe. The system detects abnormal information from the temperature probe; and determines the temperature value of the connector temperature probe based on the sum of the detected temperature value of the connector temperature probe and the first temperature value; determines the temperature value of the battery cell temperature probe based on the sum of the maximum detected temperature value of the battery cell temperature probe and the first temperature value; detects abnormal information from the connector temperature probe based on the ratio of the temperature value of the connector temperature probe to the temperature value of the battery cell temperature probe; and records the ratio of the total voltage to the total current once per second, for N times; determines the rate of change between the Nth ratio and each of the previous N-1 ratios; if the total current is greater than 5 amperes, and the rate of change between the Nth ratio and each of the previous N-1 ratios is less than 101 and greater than 99, then marks the external circuit abnormal information as Y.

[0169] Optionally, the generation module 303 determines the warning type based on one or more of the following abnormal information: abnormal information of battery cell, abnormal information of cell temperature, abnormal information of switch temperature, abnormal information of connector temperature, abnormal information of switch temperature probe, abnormal information of connector temperature probe, and abnormal information of external circuit; and generates warning information based on the warning type.

[0170] The warning information generation device provided in this application generates warning information based on one or more abnormal information from battery cell abnormalities, cell temperature abnormalities, switch temperature abnormalities, connector temperature abnormalities, switch temperature probe abnormalities, connector temperature probe abnormalities, and external circuit abnormalities. Because the warning information generated from multiple dimensions of abnormal information such as battery cell, cell temperature, switch temperature, connector temperature, switch temperature probe, and connector temperature probe is highly accurate, it improves vehicle safety.

[0171] The vehicle warning information display device provided in this application embodiment can execute the warning information generation method in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described again here.

[0172] Figure 4 This is a schematic diagram of an electronic device provided in an embodiment of this application. The electronic device is used to execute the aforementioned warning information generation method. Figure 4 As shown, the electronic device 400 may include at least one processor 401 and a memory 402, and in one possible implementation, may also include a communication interface 403.

[0173] The memory 402 is used to store programs. Specifically, the program may include program code, which includes computer operation instructions.

[0174] Memory 402 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0175] The processor 401 is used to execute computer execution instructions stored in the memory 402 to implement the method described in the foregoing method embodiments. The processor 401 may be a CPU, an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0176] Optionally, the processor 401 can communicate and interact with external devices via the communication interface 403. When the electronic device is a device or cloud platform used to provide operating instructions to intelligent operating devices, the external device mentioned here may be, for example, the intelligent operating device.

[0177] In practical implementation, if the communication interface 403, memory 402, and processor 401 are implemented independently, they can be interconnected via a bus to complete communication. 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. Buses can be categorized as address buses, data buses, control buses, etc., but this does not imply that there is only one bus or one type of bus.

[0178] Optionally, in a specific implementation, if the communication interface 403, memory 402 and processor 401 are integrated on a single chip, then the communication interface 403, memory 402 and processor 401 can communicate through an internal interface.

[0179] This application also provides a computer-readable storage medium, which may include various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. Specifically, the computer-readable storage medium stores program instructions, which are used in the methods described in the above embodiments.

[0180] This application also provides a program product including executable instructions stored in a readable storage medium. At least one processor of a computing device can read the executable instructions from the readable storage medium, and the at least one processor executes the executable instructions to cause the computing device to implement the aforementioned warning information generation method.

[0181] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for generating early warning information, characterized in that, The method includes: The system acquires one or more of the following: the total voltage of the battery pack, the total current of the battery pack, the voltage and current information of each individual battery cell in the battery pack, the temperature value detected by the cell temperature probe installed in the battery pack, the temperature value detected by the switch temperature probe, and the temperature value detected by the connector temperature probe. Based on the voltage and current information of each battery cell in the battery pack, detect abnormal information of the battery cell, and / or, based on the temperature value detected by the cell temperature probe, detect abnormal information of the cell temperature, and / or, based on the temperature value detected by the switch temperature probe, detect abnormal information of the switch temperature, and / or, based on the temperature value detected by the connector temperature probe, detect abnormal information of the connector temperature probe, and / or, based on the temperature values ​​detected by the switch temperature probe and the cell temperature probe, detect abnormal information of the switch temperature probe, and / or, based on the temperature values ​​detected by the connector temperature probe and the cell temperature probe, detect abnormal information of the connector temperature probe, and / or, based on the total voltage and total current of the battery pack, detect abnormal information of the external circuit. An early warning message is generated based on one or more of the following abnormal information: abnormal information of the battery cell, abnormal information of the battery cell temperature, abnormal information of the switch temperature, abnormal information of the connector temperature, abnormal information of the switch temperature probe, abnormal information of the connector temperature probe, and abnormal information of the external circuit.

2. The method according to claim 1, characterized in that, The voltage information includes multiple voltage values ​​collected within a preset time period, and the current information includes multiple current values ​​collected within a preset time period. Accordingly, the step of detecting abnormal information of individual battery cells based on the voltage and current information of each individual battery cell in the battery pack includes: When the battery pack is in an unused state, the voltage change value of each battery cell is determined within a preset time period based on the voltage value of each battery cell collected each time. If the voltage change value of a battery cell drops below a first preset voltage within 1 second and lasts for more than or equal to 4 seconds, the battery cell is marked as abnormal information A. If the voltage change value of a battery cell rises above a first preset voltage within 1 second and lasts for more than or equal to 4 seconds, the battery cell is marked as abnormal information B. If the voltage value of a battery cell is greater than a second preset voltage and lasts for more than or equal to 5 seconds, the battery cell is marked as abnormal information C. The battery pack is in a charging or discharging state. Based on the voltage and current values ​​of each battery cell collected each time, the resistance value of each battery cell collected this time is determined. A first ratio of the maximum resistance value and the minimum resistance value collected this time is determined. If the difference between the first ratio and the second ratio of the maximum resistance value and the minimum resistance value collected last time is greater than a first preset value and less than a second preset value, and the duration is greater than or equal to 4 seconds, then the battery cell abnormal information is marked as D. If the difference is greater than or equal to the second preset value and the duration is greater than or equal to 2 seconds, then the battery cell abnormal information is marked as S.

3. The method according to claim 1 or 2, characterized in that, The number of cell temperature probes is a first preset number; correspondingly, the step of detecting abnormal cell temperature information based on the detected temperature values ​​of the cell temperature probes includes: Based on the detected temperature value of the cell temperature probe, the maximum and minimum detected temperature values ​​are selected from the detected temperature values ​​of the first preset number of cell temperature probes, and the temperature difference between the maximum and minimum detected temperature values ​​is determined according to a preset period. If the maximum detected temperature value is greater than the first detected temperature value, the cell temperature abnormality information is marked as E, wherein the first detected temperature value is a preset cell temperature protection value minus 3 degrees Celsius. If the maximum detected temperature value is greater than the second detected temperature value, the cell temperature abnormality information is marked as F, wherein the second detected temperature value is the preset cell temperature protection value plus 5 degrees Celsius; If the difference between the current maximum detected temperature value and the previous maximum detected temperature value is greater than 2 degrees Celsius, and the duration is greater than or equal to 3 seconds, then the cell temperature abnormality information is marked as G. If the temperature difference is greater than 30 degrees Celsius and the duration is greater than or equal to 4 seconds, the cell temperature abnormality information is marked as H. If the difference between the current temperature difference and the previous temperature difference is greater than 2 degrees Celsius, and the duration is greater than or equal to 3 seconds, then the cell temperature abnormality information is marked as I. If the detected temperature value of the cell temperature probe is greater than 120 degrees Celsius, it is determined that the cell temperature probe is short-circuited; if the detected temperature value of the cell temperature probe is less than -40 degrees Celsius, it is determined that the cell temperature probe is open-circuited; if the cell temperature probe is short-circuited or open-circuited, the abnormal cell temperature information is marked as J.

4. The method according to claim 1 or 2, characterized in that, The step of detecting abnormal switch temperature information based on the detected temperature value of the switch temperature probe includes: If the detected temperature value of the switch temperature probe is greater than the third detected temperature value, then the switch temperature abnormality information is marked as K, wherein the third detected temperature value is the preset switch temperature protection value minus 3 degrees Celsius. If the detected temperature value of the switch temperature probe is greater than the fourth detected temperature value, then the switch temperature abnormality information is marked as L, wherein the fourth detected temperature value is the preset switch temperature protection value plus 3 degrees Celsius. If the difference between the temperature value detected by the current switch temperature probe and the temperature value detected by the previous switch temperature probe is greater than 3 degrees Celsius, and the duration is greater than or equal to 5 seconds, then the switch temperature abnormality information is marked as M. If the temperature value detected by the switch temperature probe is greater than 120 degrees Celsius, the switch temperature probe is determined to be short-circuited. If the temperature value detected by the switch temperature probe is less than -40 degrees Celsius, the switch temperature probe is determined to be open-circuited. If the switch temperature probe is short-circuited or open-circuited, the switch temperature abnormality information is marked as N.

5. The method according to claim 1 or 2, characterized in that, The step of detecting abnormal connector temperature information based on the temperature value detected by the connector temperature probe includes: If the temperature value detected by the connector temperature probe is greater than the fifth temperature value, the connector temperature abnormality information is marked as O, wherein the fifth temperature value is the preset connector temperature protection value minus 3 degrees Celsius. If the temperature value detected by the connector temperature probe is greater than the sixth temperature value, then the connector temperature abnormality information is marked as P, wherein the sixth temperature value is the preset connector temperature protection value plus 3 degrees Celsius. If the difference between the current temperature value detected by the connector temperature probe and the previous temperature value detected by the connector temperature probe is greater than 3 degrees Celsius, and the duration is greater than or equal to 5 seconds, then the connector temperature abnormality information is marked as Q. If the temperature value detected by the connector temperature probe is greater than 120 degrees Celsius, the connector temperature probe is determined to be short-circuited. If the temperature value detected by the connector temperature probe is less than -40 degrees Celsius, the connector temperature probe is determined to be open-circuited. If the connector temperature probe is short-circuited or open-circuited, the connector temperature abnormality information is marked as T.

6. The method according to claim 1 or 2, characterized in that, The steps include detecting abnormal information from the switch temperature probe based on the detected temperature values ​​of the switch temperature probe and the battery cell temperature probe, detecting abnormal information from the connector temperature probe based on the detected temperature values ​​of the connector temperature probe and the battery cell temperature probe, and detecting abnormal information from the external circuit based on the total voltage and total current of the battery pack. The temperature value of the switch temperature probe is determined by summing the detected temperature value of the switch temperature probe with the first temperature value; the temperature value of the cell temperature probe is determined by summing the maximum detected temperature value of the cell temperature probe with the first temperature value; abnormal information of the switch temperature probe is detected by the ratio of the temperature value of the switch temperature probe to the temperature value of the cell temperature probe; and, The temperature value of the connector temperature probe is determined by summing the detected temperature value of the connector temperature probe with a first temperature value; the temperature value of the battery cell temperature probe is determined by summing the maximum detected temperature value of the battery cell temperature probe with a first temperature value; abnormal information of the connector temperature probe is detected by the ratio of the temperature value of the connector temperature probe to the temperature value of the battery cell temperature probe; and, Record the ratio of total voltage to total current once per second, and record N times; determine the rate of change between the ratio of the Nth time and the ratios of the previous N-1 times; if the total current is greater than 5 amperes, and the rate of change between the ratio of the Nth time and the ratios of the previous N-1 times is less than 101 and greater than 99, then mark the external circuit abnormal information as Y.

7. The method according to claim 1 or 2, characterized in that, The step of generating early warning information based on one or more of the following abnormal information: battery cell abnormal information, switch temperature abnormal information, connector temperature abnormal information, switch temperature probe abnormal information, connector temperature probe abnormal information, and external circuit abnormal information, includes: The warning type is determined based on one or more of the following abnormal information: battery cell abnormal information, switch temperature abnormal information, connector temperature abnormal information, switch temperature probe abnormal information, connector temperature probe abnormal information, and external circuit abnormal information. Based on the warning type, generate warning information.

8. A warning information generation device, characterized in that, The device includes: The acquisition module is used to acquire one or more of the following: the total voltage of the battery pack, the total current of the battery pack, the voltage and current information of each battery cell in the battery pack, the detection temperature value of the cell temperature probe installed in the battery pack, the detection temperature value of the switch temperature probe, and the detection temperature value of the connector temperature probe. The detection module is used to detect abnormal information of individual battery cells based on the voltage and current information of each battery cell in the battery pack, and / or to detect abnormal information of battery cell temperature based on the temperature value detected by the cell temperature probe, and / or to detect abnormal information of switch temperature based on the temperature value detected by the switch temperature probe, and / or to detect abnormal information of connector temperature based on the temperature value detected by the connector temperature probe, and / or to detect abnormal information of switch temperature probe based on the temperature values ​​detected by the switch temperature probe and the cell temperature probe, and / or to detect abnormal information of connector temperature probe based on the temperature values ​​detected by the connector temperature probe and the cell temperature probe, and / or to detect abnormal information of external circuit based on the total voltage and total current of the battery pack. The generation module is used to generate warning information based on one or more of the abnormal information from the battery cell abnormal information, the cell temperature abnormal information, the switch temperature abnormal information, the connector temperature abnormal information, the switch temperature probe abnormal information, the connector temperature probe abnormal information, and the external circuit abnormal information.

9. An electronic device, characterized in that, include: The processor includes a communication interface and a memory, wherein the processor is communicatively connected to the communication interface and the memory, respectively. The memory stores computer-executed instructions; The communication interface communicates and interacts with external devices. The processor executes computer execution instructions stored in the memory to implement the early warning information generation method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the early warning information generation method as described in any one of claims 1 to 7.

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