A new energy vehicle power storage battery over-temperature risk grading and disposal method

Abstract

The present application relates to the field of battery risk disposal, in particular to a new energy vehicle power battery over-temperature and over-charge risk grading and disposal method. The present application designs cumulative high-temperature risk and cumulative over-charge risk indexes for the over-temperature and over-charge risk of the power battery, which are used to guide the cumulative risk grading control, and different levels of alarm and control measures are set according to the cumulative risk degree, so that the major hidden danger caused by the disappearance of the incentive external source and the disappearance of the alarm can be fundamentally solved, the safety and reliability of the power battery are improved, and the frequency of sudden vehicle fire is reduced. The vehicle controller has the functions of recording the number of high-temperature alarm occurrences, the position number of the high-temperature battery box, the cumulative over-charge amount, and the position number of the over-charge monomer box, etc., can effectively control the cumulative risk, discover abnormalities in time and take corresponding measures, and improve the safety of the power battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery risk disposal, and particularly relates to a new energy automobile power battery over-temperature risk grading and disposal method. BACKGROUND

[0002] In recent years, with the rapid development of new energy vehicles, the safety and reliability of power batteries have been increasingly valued. Power batteries may have over-temperature or over-charging failures during use, which not only shortens the service life of the batteries, but also may cause serious safety accidents such as fire and explosion, threatening the safety of vehicles and people.

[0003] In the prior art, there is a lack of effective grading and control measures for the over-temperature and over-charging risks of power batteries. Generally, when the battery temperature or voltage exceeds the preset threshold, a unified alarm signal is issued, and a single response measure such as cutting off the charging or limiting the power is taken. However, this way of alarm and control measure is relatively single, and cannot distinguish different degrees of risk, making it difficult to take corresponding alarm and control measures according to the corresponding risk degree. This is relatively insufficient in accuracy and real-time when monitoring the temperature of the power battery, and it is difficult to discover abnormal temperature rise of the battery in time and take measures. Moreover, the charging limiting strategy for the battery also lacks intelligentization and dynamic adjustment capability, and it is difficult to dynamically adjust the upper limit value of the charging power according to the remaining power and charging state of the power storage device. And the prior art lacks functions such as recording the number of high-temperature battery alarm occurrences, the position number of the high-temperature battery box, the cumulative over-charging amount, and the position number of the over-charging monomer box, and cannot effectively control the cumulative risk, which will bring great safety hazards to the vehicle.

[0004] Based on the above background, a new energy automobile power battery over-temperature risk grading and disposal method is proposed to solve the problems. SUMMARY

[0005] Other features and advantages of the present application will be set forth in the following specification, and in part will be apparent from the specification, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the specification.

[0006] The present application aims to overcome the above-mentioned deficiencies, and provides a new energy automobile power battery over-temperature risk grading and disposal method.

[0007] To achieve the above-mentioned purpose, the technical solution of the present application is:

[0008] A new energy automobile power battery over-temperature risk grading and disposal method, comprising:

[0009] The over-temperature risk classification is at least divided into two levels, i.e. the first temperature level and the second temperature level, and the second temperature level is greater than the first temperature level;

[0010] When the maximum temperature of the power storage battery exceeds the first temperature level, the instrument on the automobile issues a corresponding alarm treatment;

[0011] When the maximum temperature of the power storage battery exceeds the second temperature level, the controller on the automobile issues a vehicle stop driving instruction treatment, and sends a request for rescue information to an enterprise platform;

[0012] The automobile has a function of recording the number of times of high-temperature alarm treatment and a function of recording the corresponding box position number of the power storage battery with high temperature;

[0013] When the cumulative number of high-temperature risks of the power storage battery exceeds 10, the instrument on the automobile issues a corresponding alarm treatment, and sends a battery serious over-temperature alarm signal to an enterprise platform, and the controller on the automobile issues a torque limit instruction, and the vehicle can only drive at a low speed.

[0014] In some embodiments, the first temperature level and the second temperature level are 60°C and 65°C, respectively.

[0015] In some embodiments, the alarm treatment issued when the first temperature level is exceeded is that a corresponding yellow indicator light on the instrument is turned on, and a text prompt of battery over-temperature is given.

[0016] In some embodiments, the automobile has a function of calculating the high-temperature high-risk value of the power storage battery, and the calculation is based on the following formula:

[0017] ,

[0018] In the formula, Tmax represents the maximum temperature (°C) on the day of the i-th high-temperature alarm, and HT(i) represents the high-temperature risk value on the day of the high-temperature alarm.

[0019] In some embodiments, the automobile has a function of calculating the cumulative number of times of high-temperature alarm high-risk occurrence of the power storage battery, and the calculation is based on the following formula:

[0020] ,

[0021] In the formula, Riskht represents the cumulative high-temperature risk ( / ) of N times of high-temperature alarms, N represents the cumulative number of times (times) of related alarms, and HT(i) represents the high-temperature risk value on the day of the high-temperature alarm.

[0022] A new energy automobile power storage battery over-charge risk classification and treatment method, comprising:

[0023] The overcharge risk classification is at least divided into two levels, namely the first threshold level and the second threshold level, wherein the threshold value is represented by the maximum single cell voltage of the power battery or the percentage of the rated capacity of the power battery charge, and the second threshold level is greater than the first threshold level;

[0024] When the maximum single cell voltage of the power battery or the percentage of the rated capacity of the power battery charge exceeds the first threshold level, the corresponding indicator light on the instrument of the automobile is turned on for alarm treatment;

[0025] When the maximum single cell voltage of the power battery or the percentage of the rated capacity of the power battery charge exceeds the second threshold level, the corresponding indicator light on the instrument of the automobile is turned on for alarm treatment, and a battery serious overcharge alarm signal is sent to the enterprise platform;

[0026] The automobile has the functions of recording the overcharge electric quantity of the power battery single cell, calculating the cumulative overcharge electric quantity, and recording the corresponding box position number of the overcharged power battery;

[0027] When the cumulative value of the overcharge electric quantity of the power battery reaches 5% or more, the corresponding indicator light on the instrument of the automobile is turned on for alarm treatment;

[0028] When the cumulative value of the overcharge electric quantity of the power battery reaches 10% or more, the corresponding indicator light on the instrument of the automobile is turned on for alarm treatment, and the controller of the automobile sends a torque limiting instruction, and the vehicle can only run at a low speed.

[0029] In some embodiments, the first threshold level is 50mV when representing the maximum single cell voltage of the power battery, and 2% when representing the percentage of the rated capacity of the power battery charge, and the second threshold level is 100mV when representing the maximum single cell voltage of the power battery, and 5% when representing the percentage of the rated capacity of the power battery charge.

[0030] In some embodiments, the alarm treatment when exceeding the first threshold level is that the corresponding yellow indicator light on the instrument is turned on, and the text prompts the battery overcharge; and the alarm treatment when exceeding the second threshold level is that the corresponding red indicator light on the instrument is turned on, and the text prompts the battery serious overcharge.

[0031] In some embodiments, the automobile has the function of calculating the overcharge electric quantity of the power battery, and the calculation is based on the following formula:

[0032] ,

[0033] In the formula, I represents the overcharge process current (A); Qoc(i) represents the total overcharge amount of the i-th overcharge process (Ah); t1 represents the overcharge start time (s); and t2 represents the overcharge end time (s).

[0034] In some embodiments, the automobile is provided with a function of calculating the number of times of occurrence of the cumulative overcharge amount of the power storage battery, which is calculated according to the following formula:

[0035]

[0036] In the formula, Qoc(i) represents the total overcharge amount of the i-th overcharge process (Ah); Qn represents the rated capacity of the battery system (Ah); ACoc represents the cumulative value of N times of overcharge, in percentage (%); and N represents the number of times of relevant alarm (times).

[0037] By adopting the technical scheme, the application has the following beneficial effects:

[0038] 1. The application adopts hierarchical control measures for the over-temperature and overcharge risks of the power storage battery, sets different levels of alarms and control measures according to the risk degree, fundamentally solves the problem, improves the safety and reliability of the power storage battery, and effectively avoids serious accidents;

[0039] 2. The vehicle controller is provided with functions of recording the number of times of occurrence of high-temperature alarms, the position number of the high-temperature battery box, the cumulative overcharge amount, and the position number of the overcharged single box, etc., can effectively control the cumulative risks, timely find abnormalities and take corresponding measures;

[0040] 3. The temperature monitoring method is improved in accuracy and real-time by risk grading and disposal of different degrees, abnormalities in temperature rise can be timely found and measures can be taken, and the safety of the power storage battery is improved;

[0041] 4. The overcharge phenomenon will be limited and disposed, has intelligent and dynamic adjustment capability, can dynamically adjust the upper limit value of the charging power according to the remaining amount of the battery and the charging state and other factors, and improves the safety and efficiency of the charging process;

[0042] 5. The alarms and control measures taken for over-temperature and overcharge are diversified, can distinguish risks of different degrees, take targeted hierarchical control measures, and improve the safety and reliability of the power storage battery;

[0043] 6. The hierarchical control of the power storage battery requires very small computing power, the method is simple and easy to implement, and has the feasibility of realizing engineering application at the vehicle end.

[0044] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure.​

[0045] In order to make the above beneficial effects and other purposes, features and advantages of the present application more obvious, easy to understand, one or more preferred embodiments are specifically described below, and will be described in detail as follows. DETAILED DESCRIPTION

[0046] The embodiments of the present application will be described in detail below with examples, so that the process of how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented. It should be noted that, as long as there is no conflict, each embodiment in the present application and each feature in each embodiment can be combined with each other, and the technical solutions formed thereby are all within the protection scope of the present application.

[0047] Meanwhile, in the following description, many specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it is apparent to one skilled in the art that the present application can be implemented without the specific details or in a manner different from the specific description.

[0048] The present application provides a new energy vehicle power storage battery over-temperature risk grading and disposal method, comprising: over-temperature risk grading is at least divided into two levels, respectively first temperature gradient and second temperature gradient, the second temperature gradient is greater than the first temperature gradient; when the highest temperature of the power storage battery exceeds the first temperature gradient, the instrument on the vehicle issues the corresponding alarm disposal; when the highest temperature of the power storage battery exceeds the second temperature gradient, the controller on the vehicle issues the vehicle should stop driving instruction disposal, and sends the request for rescue information to the enterprise platform; the vehicle has the function of recording the number of times of high-temperature alarm disposal and the function of recording the corresponding box position number of the high-temperature power storage battery; when the cumulative high-temperature risk number of the power storage battery exceeds 10, the instrument on the vehicle issues the corresponding alarm disposal, and sends the battery serious over-temperature alarm signal to the enterprise platform, and the controller on the vehicle issues the torque limit instruction, and the vehicle can only drive at low speed.

[0049] By adopting the above technical scheme, when the temperature of the power storage battery is monitored, if the temperature is less than the first temperature gradient, the vehicle drives normally, when the highest temperature exceeds the first temperature gradient, the instrument on the vehicle will alarm display, and the text will prompt the battery over-temperature; when the highest temperature exceeds the second temperature gradient, the vehicle controller will issue the stop driving instruction, the vehicle should stop, and send the request for rescue information to the enterprise platform, wait for rescue, until the power storage battery over-temperature problem of the vehicle is rectified, the highest temperature of the power storage battery is reduced to normal temperature, and the stop driving function can be released.

[0050] When the accumulated high-temperature risk number of the power storage battery exceeds a certain number, the instrument on the automobile alarms the power storage battery failure red signal light, and the text prompts that the battery is seriously overheated, the charging should be stopped, and the battery serious overheating alarm signal is sent to the enterprise platform, the vehicle controller issues the torque and torque limiting command, the vehicle can only run at the highest speed of 30 km / h, and the driving power limiting signal light (yellow) is on until the vehicle temperature returns to normal, and the alarm signal and the limiting function can be removed after the high-temperature problem is rectified.

[0051] According to some embodiments of the present application, the first temperature step and the second temperature step are 60℃ and 65℃ respectively. The temperature step is the most suitable high-temperature boundary for the power storage battery, because the power storage battery exceeding 60℃ will cause the decomposition of the positive electrode material of the battery, especially the lithium iron phosphate battery and the ternary lithium battery, which will cause the change of the material structure and the destruction of the crystal lattice, further affecting the performance of the battery, and exceeding 65℃ is an abnormal situation of the power storage battery, which will cause a series of problems, affect the charging capacity of the battery, increase the internal impedance, reduce the migration speed of lithium ions, and finally cause the battery to fail.

[0052] According to some embodiments of the present application, the alarm treatment issued when exceeding the first temperature step is that the corresponding yellow indicator light on the instrument is turned on, and the text prompts that the battery is overheated. This has the effect of prompting the driver in many aspects.

[0053] According to some embodiments of the present application, the automobile has the function of calculating the high-temperature high-risk value of the power storage battery, and the calculation is based on the following formula:

[0054] ,

[0055] In the formula, Tmax represents the highest temperature (℃) of the i-th high-temperature alarm day; HT(i) represents the high-temperature risk value of the high-temperature alarm day.

[0056] The automobile has the function of calculating the accumulated high-temperature alarm high-risk occurrence number of the power storage battery, and the calculation is based on the following formula:

[0057] ,

[0058] In the formula, Riskht represents the N-time high-temperature alarm accumulated high-temperature risk ( / ); N represents the number of related alarms (times); HT(i) represents the high-temperature risk value of the high-temperature alarm day.

[0059] From the above formula, it can be known that the value greater than the first temperature step or the second temperature step can be calculated, when the accumulated high-temperature risk of the power storage battery exceeds 10, the corresponding alarm and torque and torque limiting treatment are made, so as to distinguish different degrees of risk and take targeted graded control measures.

[0060] According to some embodiments of the present application, the above strategy can be applied to the vehicle control system VCU, and can also be applied to the battery management system BMS.

[0061] A new energy vehicle power storage battery overcharge risk grading and disposal method, comprising: overcharge risk grading is at least divided into two levels, respectively, the first threshold level and the second threshold level, wherein the threshold value is expressed as the highest single cell voltage of the power storage battery or the percentage of the power storage battery charge capacity to the rated capacity, and the second threshold level is greater than the first threshold level; when the highest single cell voltage of the power storage battery or the percentage of the power storage battery charge capacity to the rated capacity exceeds the first threshold level, the instrument on the vehicle issues corresponding indicator light alarm disposal; when the highest single cell voltage of the power storage battery or the percentage of the power storage battery charge capacity to the rated capacity exceeds the second threshold level, the instrument on the vehicle issues corresponding indicator light alarm disposal, and sends a battery serious overcharge alarm signal to the enterprise platform; the vehicle has the functions of recording the overcharged power storage battery single cell charge capacity, calculating the cumulative overcharged capacity frequency, and recording the corresponding box position number of the overcharged power storage battery; when the cumulative value of the overcharged power storage battery charge capacity reaches 5% or more, the instrument on the vehicle issues corresponding indicator light alarm disposal; when the cumulative value of the overcharged power storage battery charge capacity reaches 10% or more, the instrument on the vehicle issues corresponding indicator light alarm disposal, and the controller on the vehicle issues a torque limit instruction, and the vehicle can only run at low speed. Wherein, the first threshold level represents the highest single cell voltage of the power storage battery as 50mV, and represents the percentage of the charge capacity to the rated capacity as 2%, and the second threshold level represents the highest single cell voltage of the power storage battery as 100mV, and represents the percentage of the charge capacity to the rated capacity as 5%.

[0062] By adopting the above technical scheme, when the highest single cell voltage of the power storage battery exceeds the threshold value of 50mV or more or the overcharged capacity reaches 2% of the rated capacity or more, the vehicle should issue an audible and visual alarm; when the highest single cell voltage of the power storage battery exceeds the threshold value of 100mV or more or the overcharged capacity reaches 5% of the rated capacity or more, the vehicle should issue an audible and visual alarm, the instrument on the vehicle issues a red power storage battery fault signal light alarm, and a text prompt of serious battery overcharge is given, the charging circuit should be disconnected or the brake recovery function should be turned off as soon as possible, and a battery serious overcharge alarm signal is sent to the enterprise platform.

[0063] When the cumulative overcharge risk number of the power storage battery reaches more than 5%, the instrument power storage battery fault red signal light on the automobile alarms, and the text prompts that the battery is seriously overcharged, the charging circuit should be cut off as soon as possible or the brake recovery function should be turned off, and the battery serious overcharge alarm signal is sent to the enterprise platform. Until the vehicle stops charging or recharges, the voltage returns to normal, and the alarm signal can be removed; when the cumulative overcharge risk number of the power storage battery reaches more than 10%, the instrument power storage battery fault red signal light on the automobile always alarms, the vehicle control unit issues a torque limit command, the vehicle can only limp at a maximum speed of 30 km / h, the drive power limit yellow signal light alarms, and the vehicle SOC needs to be limited to less than 90% during the next charging. Until the vehicle overcharge problem is rectified, the vehicle record overcharged battery box is replaced, and the vehicle record cumulative overcharged capacity of the box number returns to 0, the alarm signal can be removed.

[0064] According to some embodiments of the present application, when the first threshold step is exceeded, the alarm treatment is that the corresponding yellow indicator light on the instrument is turned on, and the text prompts that the battery is overcharged; when the second threshold step is exceeded, the alarm treatment is that the corresponding red indicator light on the instrument is turned on, and the text prompts that the battery is seriously overcharged. This has the effect of better prompting the driver in multiple aspects.

[0065] According to some embodiments of the present application, the automobile has the function of calculating the overcharged capacity of the power storage battery, and the calculation is based on the following formula:

[0066] ,

[0067] In the formula, I represents the overcharge current (A); Qoc(i) represents the total overcharged capacity of the i-th overcharge process (Ah); t1 represents the overcharge start time (s); and t2 represents the overcharge end time (s).

[0068] The automobile has the function of calculating the number of times of cumulative overcharged capacity of the power storage battery, and the calculation is based on the following formula:

[0069] ,

[0070] In the formula, Qoc(i) represents the total overcharged capacity of the i-th overcharge process (Ah); Qn represents the rated capacity of the battery system (Ah); ACoc represents the cumulative value of N times of overcharge, with the unit of percentage (%); and N represents the number of times of related alarm (times).

[0071] From the above formula, it can be seen that the value greater than the first threshold step or the second threshold step can be calculated, and when the cumulative overcharge risk number of the power storage battery reaches the set value, the corresponding alarm and torque limit treatment are made, thereby distinguishing different degrees of risk and taking targeted and graded control measures.

[0072] According to some embodiments of the present application, the above strategy can be applied to the vehicle control system VCU, and can also be applied to the battery management system BMS.

[0073] It is to be understood that the embodiments disclosed herein are not limited to particular treatments or materials disclosed herein but extend to and include other similar treatments and materials known or to become known to those skilled in the relevant art, as would be understood by one of ordinary skill in the art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0074] Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

[0075] Furthermore, the described features, characteristics, or aspects can be combined in any suitable manner in one or more embodiments. In the above description, numerous specific details are provided, such as specific material types, dimensions, etc., to provide a thorough understanding of embodiments of the application. However, one skilled in the relevant art will recognize that the application can be practiced without one or more of the specific details, or with other methods, components, materials, etc.

Claims

1. A method for risk classification and handling of overheating in power batteries for new energy vehicles, characterized in that, include: The over-temperature risk classification is divided into at least two levels, namely a first temperature gradient and a second temperature gradient, wherein the second temperature gradient is greater than the first temperature gradient. When the maximum temperature of the power battery exceeds the first temperature threshold, the instrument panel on the vehicle issues a corresponding alarm. When the highest temperature of the power battery exceeds the second temperature threshold, the controller on the vehicle issues a command to stop the vehicle and sends a request for assistance to the enterprise platform. The vehicle has the function of recording the number of times a high temperature alarm occurs and the function of recording the location number of the corresponding box of the power battery at high temperature. When the cumulative number of high temperature risk events of the power battery exceeds 10, the instrument panel on the vehicle will issue a corresponding alarm and send a severe over-temperature alarm signal to the enterprise platform. The controller on the vehicle will also issue a torque limiting command, and the vehicle can only drive at a low speed. The vehicle has the function of calculating the high-temperature and high-risk value of the power battery, and the calculation is based on the following formula: ， In the formula: Tmax represents the highest temperature (°C) on the day of the i-th high temperature alarm; HT(i) represents the high temperature risk value on the day of the high temperature alarm; The vehicle has the function of calculating the cumulative number of high-risk high-temperature alarms for the power battery, and the calculation is based on the following formula: ， In the formula: Riskht represents the cumulative high temperature risk value of N high temperature alarms; N represents the cumulative number of related alarms (times); HT(i) represents the high temperature risk value on the day of the high temperature alarm.

2. The method for risk classification and handling of overheating in a new energy vehicle power battery according to claim 1, characterized in that, The first temperature step and the second temperature step are 60°C and 65°C, respectively.

3. The method for risk classification and handling of overheating in a new energy vehicle power battery according to claim 1, characterized in that, When the temperature exceeds the first temperature level, the alarm will be triggered by the corresponding yellow indicator light on the instrument panel, along with a text message indicating that the battery is overheating.

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