A lithium battery fault detection method and system

Abstract

The application relates to the technical field of lithium batteries, in particular to a lithium battery fault detection method and system; the method comprises the following steps: obtaining an initial cruising range and a current cruising range of the present trip, obtaining a mileage consumption value of the present trip based on the initial cruising range and the current cruising range; obtaining an actual mileage of the present trip; obtaining an absolute difference value of the mileage consumption value and the actual mileage; judging whether the absolute difference value meets a preset first difference value range requirement; if yes, it is determined that the lithium battery is in good performance; if not, current variable information is obtained, a variable rule is obtained based on the current variable information, and whether the absolute difference value meets a preset second difference value range requirement is judged based on the current variable information and the variable rule; if yes, it is determined that the lithium battery is in good performance; if not, it is determined that the lithium battery has virtual electricity. The application helps to strengthen the detection of lithium battery faults and judge whether the lithium battery has virtual electricity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium batteries, in particular to a lithium battery fault detection method and system. BACKGROUND

[0002] Lithium battery refers to the battery containing lithium (including metal lithium, lithium alloy and lithium ion, lithium polymer) in the electrochemical system. It is widely used in various fields because of its advantages such as large specific energy, long cycle life, low self-discharge rate and no pollution. At present, the battery bicycle, hybrid electric vehicle and full electric vehicle put forward new requirements for the power and capacity of the battery. The popularity of electric vehicles depends heavily on the energy storage capacity of the battery. Lithium battery has high coulomb efficiency during use, and with the decline of lithium battery price, it occupies a huge market in the field of electric vehicles.

[0003] However, due to the incorrect use of lithium batteries by people, such as overcharging or overdischarging, etc., the lithium battery will have a virtual electric potential and consume power over time, resulting in a significant reduction in endurance, which seriously affects people's travel and even threatens people's life and property safety, so it is necessary to strengthen the detection of lithium battery faults. SUMMARY

[0004] In order to help strengthen the detection of lithium battery faults and determine whether the lithium battery has a virtual electric potential, the present application provides a lithium battery fault detection method and system.

[0005] The first aspect of the present application provides a lithium battery fault detection method, which adopts the following technical scheme:

[0006] A lithium battery fault detection method comprises:

[0007] Respectively acquiring the initial endurance mileage and the current endurance mileage of the current trip;

[0008] Based on the initial endurance mileage and the current endurance mileage, the mileage consumption value of the current trip is obtained;

[0009] Acquiring the actual mileage of the current trip;

[0010] Obtaining the absolute difference between the mileage consumption value and the actual mileage;

[0011] Determine whether the absolute difference meets the preset first difference range requirement;

[0012] If the absolute difference meets the first difference range requirement, it is determined that the lithium battery performance is good;

[0013] If the absolute difference does not meet the first difference range requirement, the current variable information is obtained;

[0014] obtaining a variable rule based on the current variable information;

[0015] judging whether the absolute difference value meets a preset second difference value range requirement based on the current variable information and the variable rule;

[0016] if the absolute difference value meets the second difference value range requirement, determining that the lithium battery has good performance;

[0017] if the absolute difference value does not meet the second difference value range requirement, determining that the lithium battery has false electricity.

[0018] By adopting the above technical solution, first, the absolute difference value between the mileage consumption value and the actual mileage is calculated, and whether the absolute difference value meets a preset first difference value range requirement is judged to determine whether the lithium battery has false electricity. When the absolute difference value meets the preset first difference value range requirement, it indicates that the mileage consumption value is consistent with the actual mileage, and the lithium battery does not have false electricity, so the lithium battery is directly determined to have good performance, thereby improving the detection efficiency. When the absolute difference value does not meet the preset first difference value range requirement, it indicates that the mileage consumption value far exceeds the actual mileage, so the current variable information needs to be considered, and whether the absolute difference value meets a preset second difference value range requirement is judged based on the current variable information and the variable rule, which helps to strengthen the detection of lithium battery faults, thereby more accurately determining whether the lithium battery has false electricity.

[0019] Optionally, the specific steps of judging whether the absolute difference value meets the preset first difference value range requirement include:

[0020] obtaining an initial power value and a current power value of the current trip;

[0021] obtaining a power consumption value based on the initial power value and the current power value;

[0022] obtaining a unit error value based on the absolute difference value and the power consumption value;

[0023] judging whether the unit error value meets a preset error range requirement;

[0024] if the unit error value meets the error range requirement, determining that the absolute difference value meets the first difference value range requirement;

[0025] if the unit error value does not meet the error range requirement, determining that the absolute difference value does not meet the first difference value range requirement.

[0026] By adopting the technical scheme, the power consumption value is obtained and unitized, and then it is judged whether the absolute difference value meets the first difference range requirement by judging whether the unit error value meets the preset error range requirement, so that the data is more accurate, the result of judging whether the absolute difference value meets the first difference range requirement is more accurate, and thus it is helpful to more accurately judge whether the lithium battery has a false voltage.

[0027] Optionally, the current variable information includes a target temperature, a target road condition, and a target road type; and the specific steps of obtaining the current variable information when the absolute difference value does not meet the difference range requirement include:

[0028] obtaining trip information of the current trip;

[0029] obtaining a target temperature, a target road condition, a target road type, and a target road property based on the trip information;

[0030] taking the target temperature, the target road condition, the target road type, and the target road property as the current variable information.

[0031] By adopting the technical scheme, the target temperature, the target road condition, the target road type, and the target road property are taken as the current variable information, multiple judgment conditions are set, and multiple judgments are helpful to more accurately judge whether the lithium battery has a false voltage.

[0032] Optionally, the specific steps of obtaining the variable rule based on the current variable information include:

[0033] generating a variable list based on the current variable information;

[0034] generating a corresponding weight based on the variable list and a preset weight model;

[0035] obtaining a variable rule based on the current variable list and the weight.

[0036] By adopting the technical scheme, the weight corresponding to different current variable information is calculated, the judgment order of different current variable information is set by the weight, the scheme is more reasonable, it is helpful to improve the judgment efficiency and the judgment result is more in line with the actual situation, and it is helpful to more accurately judge whether the lithium battery has a false voltage.

[0037] Optionally, the specific steps of judging whether the absolute difference value meets a preset second difference range requirement based on the current variable information and the variable rule include:

[0038] judging whether the target temperature meets a preset temperature range requirement based on the variable rule;

[0039] if the target temperature does not meet the temperature range requirement, obtaining a temperature-mileage consumption value change curve and taking the temperature-mileage consumption value change curve as a first change curve;

[0040] determining whether the first change curve matches a preset temperature-mileage curve;

[0041] if the first change curve matches the temperature-mileage curve, determining that the absolute difference value meets the second difference value range requirement.

[0042] By adopting the technical solution, it is determined whether the target temperature meets the preset temperature range requirement. When the target temperature does not meet the temperature range requirement, it indicates that the target temperature causes large consumption of the lithium battery. Then, it is determined whether the first change curve matches the preset temperature-mileage curve. If the first change curve matches the preset temperature-mileage curve, it indicates that the large consumption of the lithium battery is caused by the target temperature. Therefore, the mileage consumption value is much larger than the actual mileage, and it is determined that the absolute difference value meets the second difference value range requirement, and the lithium battery has good performance. Therefore, it is helpful to more accurately determine whether the lithium battery has a virtual electric quantity.

[0043] Optionally, the target road condition includes a flat road condition or a slope road condition. The specific steps of determining whether the absolute difference value meets the preset second difference value range requirement based on the current variable information and the variable rule further include:

[0044] if the target temperature meets the temperature range requirement and / or if the first change curve does not match the temperature-mileage curve, determining that the target road condition is a slope road condition or a flat road condition;

[0045] if the target road condition is a slope road condition, determining whether the slope road condition is an uphill road condition or a downhill road condition;

[0046] if the slope road condition is an uphill road condition, obtaining a slope-mileage consumption value change curve and taking the slope-mileage consumption value change curve as a second change curve;

[0047] determining whether the second change curve matches a preset slope-mileage curve;

[0048] if the second change curve matches the slope-mileage curve, determining that the absolute difference value meets the second difference value range requirement.

[0049] By adopting the technical scheme, when the target temperature meets the temperature range requirement and / or when the first change curve does not match the temperature-mileage curve, it is indicated that the current variable factor causing the mileage consumption value to be much greater than the actual mileage is not the target temperature or is affected by other current variable information in addition to the target temperature. The target road condition is determined to be a slope road condition or a flat road condition. When the target road condition is a slope road condition, the slope road condition is determined to be an uphill road condition or a downhill road condition. When the slope road condition is an uphill road condition, a second change curve is obtained. Finally, it is determined whether the second change curve matches a preset slope-mileage curve. If the second change curve matches the preset slope-mileage curve, it is indicated that the excessive consumption of the lithium battery is caused by the uphill road condition, thereby causing the mileage consumption value to be much greater than the actual mileage. Therefore, it is determined that the absolute difference value meets the second difference value range requirement, and the lithium battery has good performance, thereby helping to more accurately determine whether the lithium battery has a virtual electric quantity.

[0050] Optionally, the target road type includes a high-speed type and a low-speed type. The determining whether the absolute difference value meets a preset second difference value range requirement based on the current variable information and the variable rule further includes:

[0051] If the target road condition is a flat road condition and / or if the slope road condition is a downhill road condition and / or if the second change curve does not match the slope-mileage curve, the road type is determined to be a high-speed type or a low-speed type.

[0052] If the road type is a high-speed type, a real-time vehicle speed of the vehicle is obtained.

[0053] A target mileage corresponding to the real-time vehicle speed and a mileage coefficient are obtained.

[0054] A speed-mileage consumption value change curve is obtained based on the real-time vehicle speed, the target mileage, and the mileage coefficient, and the speed-mileage consumption value change curve is taken as a third change curve.

[0055] It is determined whether the third change curve matches a preset speed-mileage curve.

[0056] If the third change curve matches the speed-mileage curve, it is determined that the absolute difference value meets the second difference value range requirement.

[0057] By adopting the technical scheme, when the target road condition is a flat road condition and / or when the slope road condition is a downhill road condition and / or when the second change curve does not match the slope-mileage curve, it is indicated that the current variable factor causing the mileage consumption value to be much larger than the actual mileage is not the uphill road condition or is affected by other current variable information in addition to the uphill road condition. The road type is determined to be a high-speed type or a low-speed type. When the road type is the high-speed type, a third change curve is obtained, and it is determined whether the third change curve matches a preset speed-mileage curve. If the third change curve matches the speed-mileage curve, it is indicated that the excessive consumption of the lithium battery is caused by the influence of the high-speed type of road, thereby causing the mileage consumption value to be much larger than the actual mileage. Therefore, it is determined that the absolute difference value meets the second difference value range requirement, and the lithium battery has good performance, thereby helping to more accurately determine whether the lithium battery has a virtual electric quantity.

[0058] Optionally, the determining whether the third change curve matches the preset speed-mileage curve further includes:

[0059] If the third change curve does not match the speed-mileage curve, it is determined that the absolute difference value does not meet the second difference value range requirement.

[0060] By adopting the technical scheme, when the third change curve does not match the speed-mileage curve, it is indicated that the excessive consumption of the lithium battery is caused by the influence of the target temperature, the target road condition, and the target road type, thereby causing the mileage consumption value to be much larger than the actual mileage. Therefore, it is determined that the absolute difference value does not meet the second difference value range requirement, and the lithium battery has a virtual electric quantity.

[0061] Optionally, the target road property includes a soft property and a solid property. The determining whether the absolute difference value meets the preset second difference value range requirement based on the current variable information and the variable rule further includes:

[0062] If the road type is the low-speed type, it is determined that the target road property is the soft property or the solid property.

[0063] If the target road property is the solid property, it is determined that the absolute difference value does not meet the second difference value range requirement.

[0064] If the target road property is the soft property, a softness-mileage consumption value change curve is obtained, and the softness-mileage consumption value change curve is taken as a fourth change curve.

[0065] It is determined whether the fourth change curve matches a preset softness-mileage curve.

[0066] If the fourth change curve matches the softness-mileage curve, it is determined that the absolute difference value meets the second difference value range requirement.

[0067] If the fourth change curve does not match the softness-mileage curve, it is determined that the absolute difference value does not meet the second difference value range requirement.

[0068] By adopting the technical solution, when the road type is a low-speed type, it is determined that the road property is a soft property or a solid property. When the road property is a solid property, it indicates that the lithium battery power consumption is too large, and the mileage consumption value is much larger than the actual mileage, which is not or not entirely caused by the target temperature, the target road condition, the target road type, and the road property. Therefore, it is determined that the absolute difference value does not meet the second difference value range requirement, and the lithium battery has a virtual electric quantity. When the road property is a soft property, a fourth change curve is obtained, and it is determined whether the fourth change curve matches a preset softness-mileage curve. If the fourth change curve matches the softness-mileage curve, it indicates that the lithium battery power consumption is too large because of the influence of the soft property road, thereby causing the mileage consumption value to be much larger than the actual mileage. Therefore, it is determined that the absolute difference value meets the second difference value range requirement, and the lithium battery has good performance. If the fourth change curve does not match the softness-mileage curve, it indicates that the lithium battery power consumption is too large, and the mileage consumption value is much larger than the actual mileage, which is not or not entirely caused by the target temperature, the target road condition, the target road type, and the road property. Therefore, it is determined that the absolute difference value does not meet the second difference value range requirement, and the lithium battery has a virtual electric quantity. Therefore, it is helpful to more accurately determine whether the lithium battery has a virtual electric quantity.

[0069] In a second aspect, the application also discloses a lithium battery fault detection system, which adopts the following technical solution:

[0070] A lithium battery fault detection system comprises:

[0071] A first acquisition module is configured to acquire an initial cruising range and a current cruising range of a current trip, respectively.

[0072] A second acquisition module is configured to acquire a mileage consumption value of the current trip based on the initial cruising range and the current cruising range.

[0073] A third acquisition module is configured to acquire an actual mileage of the current trip.

[0074] A fourth acquisition module is configured to acquire an absolute difference value between the mileage consumption value and the actual mileage.

[0075] A first determination module is configured to determine whether the absolute difference value meets a preset first difference value range requirement.

[0076] A first execution module is configured to determine that the lithium battery has good performance if the absolute difference value meets the first difference value range requirement.

[0077] a fifth obtaining module, if the absolute difference value does not satisfy the first difference value range requirement, the fifth obtaining module is used for obtaining current variable information;

[0078] a sixth obtaining module, used for obtaining a variable rule based on the current variable information;

[0079] a second judging module, based on the current variable information and the variable rule, the second judging module is used for judging whether the absolute difference value satisfies a preset second difference value range requirement;

[0080] a second executing module, if the absolute difference value satisfies the second difference value range requirement, the second executing module is used for judging that the lithium battery is good in performance;

[0081] a third executing module, if the absolute difference value does not satisfy the second difference value range requirement, the third executing module is used for judging that the lithium battery has a virtual electric.

[0082] By adopting the above technical scheme, first, the absolute difference value of the mileage consumption value and the actual mileage is calculated, whether the absolute difference value satisfies the preset first difference value range requirement is judged, so as to judge whether the lithium battery has a virtual electric, when the absolute difference value satisfies the preset first difference value range requirement, it is indicated that the mileage consumption value is consistent with the actual mileage, the lithium battery does not have a virtual electric, then the lithium battery is directly judged to be good in performance, the detection efficiency is improved; when the absolute difference value does not satisfy the preset first difference value range requirement, it is indicated that the mileage consumption value far exceeds the actual mileage, therefore, the current variable information needs to be considered, and whether the absolute difference value satisfies the preset second difference value range requirement is judged based on the current variable information and the variable rule, which is helpful to strengthen the detection of the lithium battery fault, so as to more accurately judge whether the lithium battery has a virtual electric.

[0083] In summary, the present application includes the following beneficial technical effects:

[0084] First, the absolute difference value of the mileage consumption value and the actual mileage is calculated, whether the absolute difference value satisfies the preset first difference value range requirement is judged, so as to judge whether the lithium battery has a virtual electric, when the absolute difference value satisfies the preset first difference value range requirement, it is indicated that the mileage consumption value is consistent with the actual mileage, the lithium battery does not have a virtual electric, then the lithium battery is directly judged to be good in performance, the detection efficiency is improved; when the absolute difference value does not satisfy the preset first difference value range requirement, it is indicated that the mileage consumption value far exceeds the actual mileage, therefore, the current variable information needs to be considered, and whether the absolute difference value satisfies the preset second difference value range requirement is judged based on the current variable information and the variable rule, which is helpful to strengthen the detection of the lithium battery fault, so as to more accurately judge whether the lithium battery has a virtual electric. BRIEF DESCRIPTION OF DRAWINGS

[0085] Figure 1is a specific step flowchart of steps S101 to S111 of the embodiment of the present application.

[0086] Figure 2 is a specific step flowchart of steps S201 to S206 of the embodiment of the present application.

[0087] Figure 3 is a specific step flowchart of steps S301 to S303 of the embodiment of the present application.

[0088] Figure 4 is a specific step flowchart of steps S401 to S403 of the embodiment of the present application.

[0089] Figure 5 is a step flowchart of steps S501 to S504 of the embodiment of the present application.

[0090] Figure 6 is a step flowchart of steps S601 to S605 of the embodiment of the present application.

[0091] Figure 7 is a step flowchart of steps S701 to S706 of the embodiment of the present application.

[0092] Figure 8 is a step flowchart of step S801 of the embodiment of the present application.

[0093] Figure 9 is a step flowchart of steps S901 to S606 of the embodiment of the present application.

[0094] Figure 10 is a module diagram of a lithium battery fault detection system according to an embodiment of the present application.

[0095] Explanation of reference signs:

[0096] 1, first acquisition module; 2, second acquisition module; 3, third acquisition module; 4, fourth acquisition module; 5, first judgment module; 6, first execution module; 7, fifth acquisition module; 8, sixth acquisition module; 9, second judgment module; 10, second execution module; 11, third execution module. DETAILED DESCRIPTION

[0097] In a first aspect, the present application discloses a lithium battery fault detection method.

[0098] Reference Figure 1 A lithium battery fault detection method includes steps S101 to S111:

[0099] Step S101: respectively acquire the initial cruising range and the current cruising range of the current trip.

[0100] Specifically, in the embodiment, the initial range is the range displayed on the instrument panel before the vehicle starts the current trip; and the current range is the range displayed on the instrument panel after the vehicle ends the current trip.

[0101] Step S102: Based on the initial range and the current range, a mileage consumption value of the current trip is obtained.

[0102] Specifically, in the embodiment, the mileage consumption value is a difference value obtained by subtracting the current range from the initial range.

[0103] Step S103: An actual mileage of the current trip is obtained.

[0104] Specifically, in the embodiment, the actual mileage is the actual distance traveled by the vehicle in the current trip.

[0105] Step S104: An absolute difference value between the mileage consumption value and the actual mileage is obtained.

[0106] Specifically, in the embodiment, the absolute difference value is a difference value obtained by subtracting the actual mileage from the mileage consumption value.

[0107] Step S105: It is determined whether the absolute difference value meets a preset first difference range requirement.

[0108] Specifically, in the embodiment, the preset first difference range requirement is a first decision threshold for measuring whether the lithium battery has a false voltage, and includes a first threshold and a second threshold, the first threshold being less than or equal to the second threshold.

[0109] For example, the first threshold is 5 km, the second threshold is 10 km, and the absolute difference value is 7 km, so the absolute difference value meets the preset first difference range requirement; and the absolute difference value is 12 km, so the absolute difference value does not meet the preset first difference range requirement.

[0110] Step S106: If the absolute difference value meets the first difference range requirement, it is determined that the lithium battery has good performance.

[0111] Specifically, in the embodiment, when the absolute difference value meets the first difference range requirement, it is indicated that the absolute difference value is within the first difference range, and it is determined that the lithium battery has good performance and does not have a false voltage.

[0112] Step S107: If the absolute difference value does not meet the first difference range requirement, current variable information is obtained.

[0113] Specifically, in the embodiment, when the absolute difference value does not meet the first difference range requirement, it is indicated that the absolute difference value exceeds the first difference range, i.e., the mileage consumption value is much greater than the actual mileage.

[0114] The current variable information is a variable that can affect the mileage consumption value, including a target temperature, a target road condition, a target road type, and a target road property.

[0115] Step S108: Obtain a variable rule based on the current variable information.

[0116] Specifically, in the embodiment, the variable rule is used to set the order of judging different current variable information, and is used to set the proportion of different current variable information affecting the mileage consumption value.

[0117] Step S109: Determine whether the absolute difference value meets a preset second difference value range requirement based on the current variable information and the variable rule.

[0118] Specifically, in the embodiment, the second difference value range requirement is different from the first difference value range requirement, and is a second decision threshold for measuring whether the lithium battery has a virtual voltage, which is set on the basis of the first difference value range requirement and the premise of the current variable information and the variable rule. The second decision threshold includes a third threshold and a fourth threshold, and the third threshold is less than or equal to the fourth threshold.

[0119] For example, the third threshold is 5 km, and the fourth threshold is 30 km. Without considering the current variable information and the variable rule, the difference value does not meet the preset first difference value range requirement, but with considering the current variable information and the variable rule, the difference value meets the preset second difference value range requirement.

[0120] Step S110: If the absolute difference value meets the second difference value range requirement, it is determined that the lithium battery has good performance.

[0121] Specifically, in the embodiment, if the absolute difference value meets the second difference value range requirement, it is determined that the lithium battery has good performance, because the absolute difference value is within the allowed range.

[0122] Step S111: If the absolute difference value meets the second difference value range requirement, it is determined that the lithium battery has a virtual voltage.

[0123] Specifically, in the embodiment, if the absolute difference value does not meet the second difference value range requirement, it is determined that the lithium battery has a virtual voltage, because the absolute difference value is outside the allowed range.

[0124] The lithium battery fault detection method provided in this embodiment first calculates the absolute difference between the mileage consumption value and the actual mileage. By judging whether the absolute difference meets the preset first difference range requirement, it is determined whether the lithium battery has a false charge. When the absolute difference meets the preset first difference range requirement, it indicates that the mileage consumption value matches the actual mileage, the lithium battery does not have a false charge, and the lithium battery is directly judged to be in good performance, thus improving detection efficiency. However, when the absolute difference does not meet the preset first difference range requirement, it indicates that the mileage consumption value far exceeds the actual mileage. Therefore, it is necessary to consider the current variable information and judge whether the absolute difference meets the preset second difference range requirement based on the current variable information and variable rules. This helps to strengthen the detection of lithium battery faults and thus more accurately determine whether the lithium battery has a false charge.

[0125] Reference Figure 2 In one embodiment of this example, step S105 specifically includes steps S201 to S206:

[0126] Step S201: Obtain the initial battery level and current battery level for this trip.

[0127] Specifically, in this embodiment, the initial battery level is the battery level displayed on the car's dashboard before the start of the trip, and the current battery level is the battery level displayed on the car's dashboard after the end of the trip. Specifically, in this embodiment, the initial battery level corresponds to the initial driving range, and the current battery level corresponds to the current driving range.

[0128] Step S202: Obtain the power consumption value based on the initial power value and the current power value.

[0129] Specifically, in this embodiment, the power consumption value is the difference between the current power value and the initial power value, and the power consumption value corresponds to the mileage consumption value.

[0130] Step S203: Obtain the unit error value based on the absolute difference and the power consumption value.

[0131] Specifically, in this embodiment, the unit error value is the ratio of the absolute difference to the power consumption value.

[0132] Step S204: Determine whether the unit error value meets the preset error range requirements.

[0133] Specifically, in this embodiment, the preset error range requirement is the range of unit error values ​​that are allowed when the lithium battery performance is good.

[0134] Step S205: If the unit error value meets the error range requirement, then the absolute difference is determined to meet the first difference range requirement;

[0135] Step S206: If the unit error value does not meet the error range requirement, it is determined that the absolute difference value does not meet the first difference value range requirement. The lithium battery fault detection method provided in the embodiment acquires the power consumption value, units the power consumption value, and then determines whether the absolute difference value meets the first difference value range requirement by judging whether the unit error value meets the preset error range requirement. The data is more accurate, and the result of determining whether the absolute difference value meets the first difference value range requirement is more accurate, thereby helping to more accurately determine whether the lithium battery has a virtual electric.

[0136] Referring to Figure 3 In one of the implementation manners of the embodiment, the specific steps of step S107 include steps S301 to S303.

[0137] Step S301: Acquire the trip information of the current trip.

[0138] Specifically, in the embodiment, the trip information includes the region of the trip, the trip path, and the sudden situation in the trip.

[0139] Step S302: Based on the trip information, acquire the target temperature, the target road condition, the target road type, and the target road property.

[0140] Specifically, in the embodiment, the target temperature is the environmental temperature of the region passed through in the current trip; the target road condition is the road condition of the trip path of the current trip; the target road type is the road type of the trip path of the current trip; and the target road property is the road property of the trip path of the current trip.

[0141] Step S303: Take the target temperature, the target road condition, the target road type, and the target road property as the current variable information.

[0142] The lithium battery fault detection method provided in the embodiment takes the target temperature, the target road condition, the target road type, and the target road property as the current variable information, sets multiple determination conditions, and helps to more accurately determine whether the lithium battery has a virtual electric through multiple determinations.

[0143] Referring to Figure 4 In one of the implementation manners of the embodiment, the specific steps of step S108 include steps S401 to S403.

[0144] Step S401: Generate a variable list based on the current variable information.

[0145] Specifically, in the embodiment, different current variable information is recorded in the variable list.

[0146] Step S402: Generate corresponding weights based on the variable list and a preset weight model.

[0147] Specifically, in the embodiment, the preset weight model can be a server, a plug-in, a computing terminal, or the like, and is configured to determine the influence degree of different current variable information on the lithium battery power or the cruising range according to a large amount of data or actual use conditions.

[0148] Step S403: Obtain the variable rule based on the current variable list and the weight.

[0149] Specifically, in the embodiment, whether the current variable information corresponding to the weight is a factor causing the absolute difference to be too large in the current trip is determined according to the order of the weight from large to small.

[0150] The lithium battery fault detection method provided in the embodiment calculates the weight corresponding to different current variable information, and sets the judgment order of different current variable information through the weight, so that the scheme is more reasonable, which not only helps to improve the judgment efficiency but also makes the judgment result more in line with the actual situation, helps to more accurately judge whether the lithium battery has a virtual electric, and helps to improve the judgment efficiency.

[0151] Reference Figure 5 In one of the embodiments of the present embodiment, the specific steps of step S109 include steps S501 to S504:

[0152] Step S501: Determine whether the target temperature meets the preset temperature range requirement based on the variable rule.

[0153] Specifically, in the embodiment, when the automobile is started, the lithium battery is already affected by the target temperature, so it is first determined whether the target temperature meets the preset temperature range requirement; the preset temperature range requirement can be 25 degrees Celsius to 40 degrees Celsius.

[0154] It is worth noting that within a certain temperature range, the higher the temperature, the better the conductivity of the lithium battery. In addition, the higher the ambient temperature, the less heat the battery itself generates, and the less chemical energy it consumes. Therefore, the overall efficiency will be higher, so the lithium battery cruising range will also be improved, but if the target temperature continues to rise beyond the preset temperature range, it may cause the lithium battery to overheat and explode naturally.

[0155] Step S502: If the target temperature does not meet the temperature range requirement, obtain the first change curve.

[0156] Specifically, in the embodiment, the first change curve is a temperature-mileage consumption value change curve, that is, a curve of the mileage consumption value change caused by the target temperature change in the current trip.

[0157] When the target temperature does not meet the temperature range requirement, it indicates that the target temperature can be a current variable factor causing the absolute difference to be too large, so the first change curve needs to be obtained for further judgment.

[0158] Step S503: determining whether the first change curve matches the preset temperature-mileage curve.

[0159] Specifically, in this embodiment, the preset temperature-mileage curve is a standard curve of change of mileage consumption value caused by temperature change, which is set according to the performance of the lithium battery and a large amount of data.

[0160] Step S504: if the first change curve matches the temperature-mileage curve, determining that the absolute difference satisfies the second difference range requirement.

[0161] Specifically, in this embodiment, the first change curve matching the temperature-mileage curve means that the fluctuation range of the first change curve is within the allowable error range of the temperature-mileage curve.

[0162] When the first change curve matches the temperature-mileage curve, it indicates that the absolute difference does not satisfy the first difference range requirement caused by the target temperature, and thus it is determined that the absolute difference satisfies the second difference range requirement, i.e., the performance of the lithium battery is good and there is no false electricity. The lithium battery fault detection method provided in this embodiment determines whether the target temperature satisfies the preset temperature range requirement. When the target temperature does not satisfy the temperature range requirement, it indicates that the target temperature causes a large consumption of the lithium battery. Then, by determining whether the first change curve matches the preset temperature-mileage curve, if they match, it indicates that the large consumption of the lithium battery is caused by the target temperature, so that the mileage consumption value is much larger than the actual mileage. Therefore, it is determined that the absolute difference satisfies the second difference range requirement, and the performance of the lithium battery is good, thereby helping to more accurately determine whether the lithium battery has false electricity.

[0163] Reference Figure 6 In one of the implementation manners of this embodiment, the specific steps of step S109 further include steps S601 to S605:

[0164] Step S601: if the target temperature satisfies the temperature range requirement and / or if the first change curve does not match the temperature-mileage curve, determining that the target road condition is a slope road condition or a flat road condition.

[0165] Specifically, in this embodiment, the target road condition includes a slope road condition and a flat road condition. When the target temperature satisfies the temperature range requirement and / or if the first change curve does not match the temperature-mileage curve, it indicates that the absolute difference does not satisfy the first difference range requirement and is not caused by the target temperature, or is also affected by other current variable information except the target temperature. Therefore, it is necessary to determine whether the target road condition is a slope road condition or a flat road condition for further determination.

[0166] Step S602: if the target road condition is a slope road condition, determining whether the slope road condition is an uphill road condition or a downhill road condition.

[0167] Specifically, in the embodiment, the slope road condition includes an uphill road condition and a downhill road condition.

[0168] Step S603: If the slope road condition is the uphill road condition, a second change curve is obtained.

[0169] Specifically, in the embodiment, the second change curve is a slope-mileage consumption value change curve, that is, a curve caused by the change of the mileage consumption value affected by the slope.

[0170] Step S604: It is judged whether the second change curve matches a preset slope-mileage curve.

[0171] Specifically, in the embodiment, the preset slope-mileage curve is a standard curve of the change of the mileage consumption value caused by the slope change, which is set according to the performance of the lithium battery and a plurality of data.

[0172] Step S605: If the second change curve matches the slope-mileage curve, it is determined that the absolute difference value meets the second difference value range requirement.

[0173] Specifically, in the embodiment, the second change curve matching the slope-mileage curve means that the fluctuation range of the second change curve is within the allowable error range of the slope-mileage curve.

[0174] The lithium battery fault detection method provided in the embodiment, when the target temperature meets the temperature range requirement and / or when the first change curve does not match the temperature-mileage curve, indicates that the current variable factor causing the mileage consumption value to be much greater than the actual mileage is not the target temperature or is affected by other current variable information in addition to the target temperature. It is judged that the target road condition is the slope road condition or the flat road condition, when the target road condition is the slope road condition, it is further judged that the slope road condition is the uphill road condition or the downhill road condition, when the slope road condition is the uphill road condition, the second change curve is obtained, and finally it is judged whether the second change curve matches the preset slope-mileage curve. If it matches, it indicates that the excessive consumption of the lithium battery power is caused by the influence of the uphill road condition, thereby causing the mileage consumption value to be much greater than the actual mileage, so it is determined that the absolute difference value meets the second difference value range requirement, and the lithium battery performance is good, thereby helping to more accurately determine whether the lithium battery has a virtual electric.

[0175] Referring to Figure 7 In one of the embodiments of the present embodiment, the specific steps of step S109 further include steps S701 to S706:

[0176] Step S701: If the target road condition is the flat road condition and / or if the slope road condition is the downhill road condition and / or if the second change curve does not match the slope-mileage curve, it is judged that the road type is the high-speed type or the low-speed type.

[0177] Specifically, in the embodiment, the road type includes a high-speed type and a low-speed type, the high-speed type includes an expressway type, and the low-speed type includes an urban road type or a rural road type; when the target road condition is a flat road condition and / or when the slope road condition is a downhill road condition and / or when the second change curve does not match the slope-mileage curve, it indicates that the absolute difference does not meet the first difference range requirement and is not caused by the target road condition, or is also affected by other current variable information in addition to the target road condition, so it is necessary to determine whether the road type is a high-speed type or a low-speed type to make further discrimination.

[0178] Step S702: If the road type is a high-speed type, the real-time speed of the automobile is obtained.

[0179] Step S703: The target mileage corresponding to the real-time speed and the mileage coefficient are obtained.

[0180] Specifically, in the embodiment, the target mileage is the total mileage traveled at different real-time speeds, for example, the automobile travels a total of 50 km at a speed of 120 km / h, and the target mileage corresponding to 120 km / h is 50 km.

[0181] Specifically, in the embodiment, the mileage coefficient refers to a constant that affects the mileage consumption value when the different real-time speeds are compared with the threshold speed, denoted by C. For example, the threshold speed is 60 km / h, and when the real-time speed is 80 km / h, the mileage consumption value is C times 60 km / h, so the mileage coefficient is C when the real-time speed is 80 km / h.

[0182] Step S704: Based on the real-time speed, the target mileage, and the mileage coefficient, a third change curve is obtained.

[0183] Specifically, in the embodiment, the third change curve is a speed-mileage consumption value change curve, that is, when the real-time speed changes, the mileage consumption value changes.

[0184] Step S705: Determine whether the third change curve matches the preset speed-mileage curve.

[0185] Specifically, in the embodiment, the preset speed-mileage curve is a standard curve of the change of the mileage consumption value caused by the change of the speed according to the performance of the lithium battery and numerous data settings.

[0186] Step S706: If the third change curve matches the speed-mileage curve, it is determined that the absolute difference meets the second difference range requirement.

[0187] Specifically, in the embodiment, the third change curve matching the speed-mileage curve means that the fluctuation range of the third change curve is within the allowable error range of the speed-mileage curve.

[0188] The lithium battery fault detection method provided in the embodiment indicates that the current variable factor causing the mileage consumption value to be much greater than the actual mileage is not the uphill road condition or is affected by other current variable information in addition to the uphill road condition, and judges the road type to be a high-speed type or a low-speed type when the target road condition is a flat road condition and / or when the uphill road condition is a downhill road condition and / or when the second change curve does not match the gradient-mileage curve. When the road type is the high-speed type, the third change curve is obtained, and it is judged whether the third change curve matches the preset speed-mileage curve. If they match, it indicates that the excessive consumption of the lithium battery power is caused by the influence of the high-speed type road, thereby causing the mileage consumption value to be much greater than the actual mileage. Therefore, it is determined that the absolute difference value meets the second difference value range requirement, and the lithium battery has good performance, thereby helping to more accurately determine whether the lithium battery has a virtual electric quantity.

[0189] Referring to Figure 8 In one of the implementation manners of the embodiment, the specific steps of step S705 include step S801.

[0190] Step S801: If the third change curve does not match the speed-mileage curve, it is determined that the absolute difference value does not meet the second difference value range requirement.

[0191] The lithium battery fault detection method provided in the embodiment indicates that the lithium battery power is excessively consumed, and the mileage consumption value is much greater than the actual mileage, which is not or not entirely caused by the target temperature, the target road condition, and the target road type. Therefore, it is determined that the absolute difference value does not meet the second difference value range requirement, and the lithium battery has a virtual electric quantity.

[0192] Referring to Figure 9 In one of the implementation manners of the embodiment, the specific steps of step S109 further include steps S901 to S906.

[0193] Step S901: If the road type is the low-speed type, it is judged that the target road property is the soft property or the solid property.

[0194] Specifically, in the embodiment, the target road property includes the soft property and the solid property. The soft property refers to a relatively soft road surface, for example, a soft property such as a mud road or a gravel road; and the solid property refers to a relatively solid road surface, for example, a solid property such as a cement road or an asphalt road.

[0195] Step S902: If the target road property is the solid property, it is determined that the absolute difference value does not meet the second difference value range requirement.

[0196] Specifically, in the embodiment, when the target road property is the firm property, it is indicated that the absolute difference value does not meet the first difference value range requirement is caused by the target road property, so it is determined that the absolute difference value does not meet the second difference value range requirement, and the lithium battery has a false voltage.

[0197] Step S903: If the target road property is the soft property, a softness-mileage consumption value change curve is obtained, and the softness-mileage consumption value change curve is taken as the fourth change curve.

[0198] Specifically, in the embodiment, when the target road property is the soft property, it is indicated that the absolute difference value does not meet the first difference value range requirement is caused by the target road property, so the fourth change curve is obtained for further determination.

[0199] The fourth change curve is a softness-mileage consumption value change curve, that is, a curve in which the mileage consumption value changes when the softness changes.

[0200] Step S904: It is determined whether the fourth change curve matches a preset softness-mileage curve.

[0201] Specifically, in the embodiment, the preset softness-mileage curve is a standard curve in which the mileage consumption value changes due to the softness change, which is set according to the lithium battery performance and a large amount of data.

[0202] Step S905: If the fourth change curve matches the softness-mileage curve, it is determined that the absolute difference value meets the second difference value range requirement.

[0203] Specifically, in the embodiment, the fourth change curve matches the softness-mileage curve means that the fluctuation range of the fourth change curve is within the allowable error range of the speed-mileage curve.

[0204] Step S906: If the fourth change curve does not match the softness-mileage curve, it is determined that the absolute difference value does not meet the second difference value range requirement.

[0205] The implementation principle of the lithium battery fault detection method in the embodiment of the application is as follows: an initial cruising range and a current cruising range of the current trip are acquired respectively, a mileage consumption value of the current trip is acquired based on the initial cruising range and the current cruising range, an actual mileage of the current trip is acquired, an absolute difference value between the mileage consumption value and the actual mileage is acquired, it is judged whether the absolute difference value meets a preset first difference value range requirement, if the absolute difference value meets the first difference value range requirement, it is determined that the lithium battery is in good performance, if the absolute difference value does not meet the first difference value range requirement, current variable information is acquired, a variable rule is acquired based on the current variable information, and it is judged whether the absolute difference value meets a preset second difference value range requirement based on the current variable information and the variable rule, if the absolute difference value meets the second difference value range requirement, it is determined that the lithium battery is in good performance, and if the absolute difference value does not meet the second difference value range requirement, it is determined that the lithium battery has a virtual electric.

[0206] In a second aspect, the application further discloses a lithium battery fault detection system.

[0207] With reference to Figure 10 The lithium battery fault detection system comprises:

[0208] A first acquisition module 1 is configured to acquire an initial cruising range and a current cruising range of the current trip respectively.

[0209] A second acquisition module 2 is configured to acquire a mileage consumption value of the current trip based on the initial cruising range and the current cruising range.

[0210] A third acquisition module 3 is configured to acquire an actual mileage of the current trip.

[0211] A fourth acquisition module 4 is configured to acquire an absolute difference value between the mileage consumption value and the actual mileage.

[0212] A first judgment module 5 is configured to judge whether the absolute difference value meets a preset first difference value range requirement.

[0213] A first execution module 6 is configured to determine that the lithium battery is in good performance if the absolute difference value meets the first difference value range requirement.

[0214] A fifth acquisition module 7 is configured to acquire current variable information if the absolute difference value does not meet the first difference value range requirement.

[0215] A sixth acquisition module 8 is configured to acquire a variable rule based on the current variable information.

[0216] A second judgment module 9 is configured to judge whether the absolute difference value meets a preset second difference value range requirement based on the current variable information and the variable rule.

[0217] The second execution module 10 is configured to determine that the lithium battery has good performance if the absolute difference meets the second difference range requirement.

[0218] The third execution module 11 is configured to determine that the lithium battery has virtual electricity if the absolute difference does not meet the second difference range requirement.

[0219] The implementation principle of the lithium battery fault detection system in the embodiment of the application is as follows:

[0220] The first acquisition module 1 acquires the initial cruising range and the current cruising range of the current trip and sends the initial cruising range and the current cruising range to the second acquisition module 2. The second acquisition module 2 acquires the mileage consumption value of the current trip based on the initial cruising range and the current cruising range and sends the mileage consumption value to the fourth acquisition module 4. The third acquisition module 3 acquires the actual mileage of the current trip and sends the actual mileage to the fourth acquisition module 4. The fourth acquisition module 4 acquires the absolute difference between the mileage consumption value and the actual mileage and sends the absolute difference to the first judgment module 5.

[0221] The first judgment module 5 judges whether the absolute difference meets the preset first difference range requirement. If the absolute difference meets the first difference range requirement, the first judgment module 5 sends the judgment result to the first execution module 6. The first execution module 6 determines that the lithium battery has good performance. If the absolute difference does not meet the first difference range requirement, the first judgment module 5 sends the judgment result to the fifth acquisition module 7. The fifth acquisition module 7 acquires the current variable information and sends the current variable information to the sixth acquisition module 8.

[0222] The sixth acquisition module 8 acquires the variable rule based on the current variable information and sends the variable rule to the second judgment module 9. The second judgment module 9 judges whether the absolute difference meets the preset second difference range requirement based on the current variable information and the variable rule. If the absolute difference meets the second difference range requirement, the second judgment module 9 sends the judgment result to the second execution module 10. The second execution module 10 determines that the lithium battery has good performance. If the absolute difference does not meet the second difference range requirement, the second judgment module 9 sends the judgment result to the third execution module 11. The third execution module 11 determines that the lithium battery has virtual electricity, thereby achieving the same technical effect as the aforementioned lithium battery fault detection method.

[0223] The above are preferred embodiments of the application, which do not limit the protection scope of the application. Any equivalent changes made on the basis of the structure, shape, principle of the application should be covered by the protection scope of the application.

Claims

1. A lithium battery failure detection method, characterized by, The method comprises the following steps: obtaining an initial range and a current range of the current trip, respectively; obtaining a range consumption value of the current trip based on the initial range and the current range; obtaining an actual range of the current trip; obtaining an absolute difference value between the range consumption value and the actual range; determining whether the absolute difference value meets a preset first difference value range requirement; if the absolute difference value meets the first difference value range requirement, determining that the lithium battery is in good performance; if the absolute difference value does not meet the first difference value range requirement, obtaining current variable information, which is a variable affecting the range consumption value; obtaining a variable rule based on the current variable information, the variable rule being used to set the order of different current variable information and being used to set the proportion of different current variable information affecting the range consumption value; determining whether the absolute difference value meets a preset second difference value range requirement based on the current variable information and the variable rule; if the absolute difference value meets the second difference value range requirement, determining that the lithium battery is in good performance; if the absolute difference value does not meet the second difference value range requirement, determining that the lithium battery has a virtual electric quantity; wherein the specific steps of obtaining the variable rule based on the current variable information comprise: generating a variable list based on the current variable information; generating a corresponding weight based on the variable list and a preset weight model; obtaining the variable rule based on the current variable list and the weight; wherein the specific steps of determining whether the absolute difference value meets the preset second difference value range requirement based on the current variable information and the variable rule comprise: determining whether a target temperature meets a preset temperature range requirement based on the variable rule; if the target temperature does not meet the temperature range requirement, obtaining a temperature-range consumption value change curve and taking the temperature-range consumption value change curve as a first change curve; determining whether the first change curve matches a preset temperature-range curve; if the first change curve matches the temperature-range curve, determining that the absolute difference value meets the second difference value range requirement.

2. The method of claim 1, wherein the method further comprises: The specific steps of determining whether the absolute difference value meets the preset first difference value range requirement comprise: obtaining an initial electric quantity value and a current electric quantity value of the current trip; obtaining an electric quantity consumption value based on the initial electric quantity value and the current electric quantity value; obtaining a unit error value based on the absolute difference value and the electric quantity consumption value; determining whether the unit error value meets a preset error range requirement; if the unit error value meets the error range requirement, determining that the absolute difference value meets the first difference value range requirement; if the unit error value does not meet the error range requirement, determining that the absolute difference value does not meet the first difference value range requirement.

3. The method of claim 1, wherein the step of detecting a fault in the lithium battery comprises: The current variable information comprises a target temperature, a target road condition and a target road type; and the specific steps of obtaining the current variable information if the absolute difference value does not meet the difference value range requirement comprise: obtaining trip information of the current trip; obtaining a target temperature, a target road condition, a target road type, and a target road property based on the travel information; obtaining the target temperature, the target road condition, the target road type, and the target road property as the current variable information.

4. The method of claim 1, wherein the step of detecting a fault in the lithium battery comprises: The target road condition includes a flat road condition or a slope road condition; and the step of determining whether the absolute difference value meets the preset second difference value range requirement based on the current variable information and the variable rule further includes: if the target temperature meets the temperature range requirement and / or if the first change curve does not match the temperature-mileage curve, determining that the target road condition is a slope road condition or a flat road condition; if the target road condition is a slope road condition, determining whether the slope road condition is an uphill road condition or a downhill road condition; if the slope road condition is an uphill road condition, obtaining a slope-mileage consumption value change curve, and taking the slope-mileage consumption value change curve as a second change curve; determining whether the second change curve matches a preset slope-mileage curve; if the second change curve matches the slope-mileage curve, determining that the absolute difference value meets the second difference value range requirement.

5. The method of claim 4, wherein the step of detecting a fault in the lithium battery comprises: The target road type includes a high-speed type and a low-speed type; and the step of determining whether the absolute difference value meets the preset second difference value range requirement based on the current variable information and the variable rule further includes: if the target road condition is a flat road condition and / or if the slope road condition is a downhill road condition and / or if the second change curve does not match the slope-mileage curve, determining that the road type is a high-speed type or a low-speed type; if the road type is a high-speed type, obtaining a real-time vehicle speed of the vehicle; obtaining a target mileage corresponding to the real-time vehicle speed and a mileage coefficient; obtaining a speed-mileage consumption value change curve based on the real-time vehicle speed, the target mileage, and the mileage coefficient, and taking the speed-mileage consumption value change curve as a third change curve; determining whether the third change curve matches a preset speed-mileage curve; if the third change curve matches the speed-mileage curve, determining that the absolute difference value meets the second difference value range requirement. The step of determining whether the third change curve matches the preset speed-mileage curve further includes:

6. The method of claim 5, wherein the step of detecting a fault in the lithium battery comprises: if the third change curve does not match the speed-mileage curve, determining that the absolute difference value does not meet the second difference value range requirement. The target road property includes a soft property and a solid property; and the step of determining whether the absolute difference value meets the preset second difference value range requirement based on the current variable information and the variable rule further includes:

7. The method of claim 6, wherein the step of detecting a fault in the lithium battery comprises the step of: if the road type is a low-speed type, determining that the target road property is a soft property or a solid property; ​ if the target road property is a solid property, determining that the absolute difference value does not meet the second difference value range requirement; if the target road property is a soft property, obtaining a softness-mileage consumption value change curve, and taking the softness-mileage consumption value change curve as a fourth change curve; ​ determining whether the fourth change curve matches a preset softness-mileage curve; if the fourth change curve matches the softness-mileage curve, determining that the absolute difference value meets the second difference value range requirement; if the fourth change curve does not match the softness-mileage curve, determining that the absolute difference value does not meet the second difference value range requirement.

8. A lithium battery fault detection system characterized by, comprise: a first acquisition module (1) configured to acquire an initial cruising range and a current cruising range of a current trip respectively; a second acquisition module (2) configured to acquire a mileage consumption value of the current trip based on the initial cruising range and the current cruising range; a third acquisition module (3) configured to acquire an actual mileage of the current trip; a fourth acquisition module (4) configured to acquire an absolute difference value of the mileage consumption value and the actual mileage; a first determination module (5) configured to determine whether the absolute difference value meets a preset first difference value range requirement; a first execution module (6) configured to determine that the lithium battery has good performance if the absolute difference value meets the first difference value range requirement; a fifth acquisition module (7) configured to acquire current variable information if the absolute difference value does not meet the first difference value range requirement, the current variable information being a variable affecting the mileage consumption value; a sixth acquisition module (8) configured to acquire a variable rule based on the current variable information, the variable rule being used to set an order of different current variable information and being used to set a proportion of different current variable information affecting the mileage consumption value; a second determination module (9) configured to determine whether the absolute difference value meets a preset second difference value range requirement based on the current variable information and the variable rule; a second execution module (10) configured to determine that the lithium battery has good performance if the absolute difference value meets the second difference value range requirement; a third execution module (11) configured to determine that the lithium battery has virtual electricity if the absolute difference value does not meet the second difference value range requirement; wherein the specific steps of acquiring the variable rule based on the current variable information comprise: generating a variable list based on the current variable information; generating a corresponding weight based on the variable list and a preset weight model; acquiring the variable rule based on the current variable list and the weight; wherein the specific steps of determining whether the absolute difference value meets the preset second difference value range requirement based on the current variable information and the variable rule comprise: determining whether a target temperature meets a preset temperature range requirement based on the variable rule; if the target temperature does not meet the temperature range requirement, acquiring a temperature-mileage consumption value change curve and taking the temperature-mileage consumption value change curve as a first change curve; determining whether the first change curve matches a preset temperature-mileage curve; if the first change curve matches the temperature-mileage curve, determining that the absolute difference value meets the second difference value range requirement.

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