Control method of new energy vehicle energy storage battery real-time monitoring safety early warning system

Abstract

The application provides a control method of a real-time monitoring and safety warning system for a new energy automobile energy storage battery. In each charging / discharging or driving process of the electric vehicle, a sensing and monitoring module continuously acquires and records the current overall working condition of the battery pack in the electric vehicle and the independent working condition of each battery cell of the battery pack. A data acquisition module continuously acquires the overall working condition and the independent working condition and records them as an overall signal and a plurality of corresponding independent signals respectively. A central control module continuously acquires the overall signal and the plurality of independent signals, compares them with the signal thresholds preset in the central control module respectively, and sends corresponding control signals to each control unit. The safety use of the new energy automobile and the timely sending of a warning signal to the user are realized, and a safety accident is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to a battery safety early warning system of an electric vehicle, in particular to a control method of a real-time monitoring safety early warning system of an energy storage battery of a new energy vehicle. BACKGROUND

[0002] With the development of automobile manufacturing technology, the practical application range of new energy vehicles has been continuously expanded. The power battery is the most important part of the new energy vehicle. Since the capacity of a single battery is insufficient to drive the vehicle for a long distance and for a long time, the current power battery is commonly used by tens or hundreds of batteries in series and parallel connection to achieve the required voltage for driving the vehicle.

[0003] However, the battery pack composed of single batteries is prone to overcharging and overdischarging during the charging and discharging process. In addition, the battery pack may also appear thermal runaway due to excessively high working environment temperature, and the battery pack may also be deformed due to bumps and vibrations during driving, and then appear strain failure to cause the overall failure of the battery pack. At present, the safety performance monitoring and protection of the battery pack on the market still stays in the use of the equalization control unit to monitor and calculate the voltage during the charging and discharging process to protect the battery. There is no relatively perfect early warning system for the above-mentioned various situations, and it is impossible to provide a relatively safe driving environment for users. SUMMARY

[0004] To solve the above problems, the application provides a control method of a real-time monitoring safety early warning system of an energy storage battery of a new energy vehicle, which is implemented as follows.

[0005] The control method of the real-time monitoring safety early warning system of the energy storage battery of the new energy vehicle comprises the following steps:

[0006] S1. In each charging / discharging or driving process of the electric vehicle, the sensing and monitoring module continuously acquires and records the current overall working condition of the battery pack in the electric vehicle and the independent working condition of each battery unit of the battery pack.

[0007] S2. The data acquisition module continuously acquires the overall working condition and the independent working condition and records them as an overall signal and a plurality of corresponding independent signals respectively.

[0008] S3. The central control module continuously acquires the overall signal and a plurality of independent signals, compares them with the signal threshold value preset in the central control module respectively, and sends corresponding control signals to each control unit.

[0009] As a further improvement, the sensing monitoring module comprises voltage monitoring units respectively arranged in the battery pack, a temperature monitoring unit arranged inside the shell of the battery pack, a strain monitoring unit arranged on each battery of the battery pack, a vibration monitoring unit arranged outside the shell of the battery pack, a current monitoring unit arranged at both ends of the battery pack, and an insulation monitoring unit arranged at the bottom of the shell of the battery pack.

[0010] The central control module comprises a CPU unit and a data processing and analysis unit, and further comprises an equalization control unit electrically connected with each battery of the battery pack, and the central control module is further electrically connected with a terminal display screen.

[0011] The control unit comprises a temperature control unit arranged in the shell of the battery pack and a battery pack circuit general switch.

[0012] Each battery of the battery pack is independently numbered.

[0013] As a further improvement, the overall signal comprises a total voltage signal P, a total current signal I, a total temperature signal T, a total vibration signal V, and a ground insulation signal A.

[0014] The independent signal comprises a plurality of mutually independent battery voltage signals p1, p2, p3...pn and a plurality of mutually independent strain signals N1, N2, N3...Nn.

[0015] The signal threshold value comprises a total current threshold value It, a first temperature threshold value Tt1, a second temperature threshold value Tt2, a total vibration threshold value Vt, a battery strain threshold value nt, an insulation failure threshold value At, a plurality of overcharge voltage threshold values pt1, pt2, pt3...ptn corresponding to each battery of the battery pack, and a plurality of overdischarge voltage threshold values pt1', pt2', pt3'...ptn' corresponding to each battery of the battery pack, wherein Tt1

[0016] As a further improvement, the step S1 further comprises the following steps:

[0017] S101. Determine the state of the current electric vehicle and start the corresponding monitoring unit in the sensing monitoring module;

[0018] S102. If the electric vehicle is in a charging state, start the voltage monitoring unit and the temperature monitoring unit;

[0019] If the electric vehicle is in a discharging and vehicle stopping state, start the current monitoring unit and the temperature monitoring unit;

[0020] If the electric vehicle is in a discharging and vehicle running state, start the current monitoring unit, the temperature monitoring unit, the strain monitoring unit, and the vibration monitoring unit.

[0021] S103. The sensing and monitoring module continuously acquires and records the current overall working condition of the battery pack in the electric vehicle and the independent working condition of each battery cell of the battery pack.

[0022] As a further improvement, the step S3 is specifically:

[0023] S301. If any of the battery voltage signals appears pm>ptn, or pmptn', the circuit is turned off, and the energy in the battery with pm>ptn is balanced to the adjacent battery with lower voltage, or the energy in the battery with pmptn' is balanced to the adjacent battery with higher voltage, while the balancing control unit records the current voltage signals;

[0024] S302. If T>Tt1 appears, the central control module sends a cooling control signal to the temperature control unit, and the temperature control unit cools the battery pack;

[0025] S303. If T>Tt2 appears, the circuit is turned off, and the central control module sends a cooling control signal to the temperature control unit and a high temperature warning signal to the terminal display screen, and the corresponding high temperature warning image is displayed on the terminal display screen to remind the user;

[0026] S304. If I>It appears, the circuit is turned off, and the central control module sends an overcurrent warning signal to the terminal display screen, and the corresponding overcurrent warning image is displayed on the terminal display screen to remind the user;

[0027] S305. If any of the strain signals appears Nm>nt, the circuit is turned off, and the central control module sends a battery damage warning signal to the terminal display screen, and the corresponding battery damage warning image is displayed on the terminal display screen to remind the user;

[0028] S306. If V>Vt appears, the central control module sends an over-vibration warning signal to the terminal display screen, and the corresponding over-vibration warning image is displayed on the terminal display screen to remind the user to slow down;

[0029] S307. If A<At appears, the circuit is turned off, and the central control module sends an insulation failure warning signal to the terminal display screen, and the corresponding insulation failure warning image is displayed on the terminal display screen to remind the user.

[0030] As a further improvement, the current monitoring unit is a Hall current sensor;

[0031] The voltage monitoring unit is a battery management chip;

[0032] The temperature monitoring unit and the strain monitoring unit are fiber grating sensors.

[0033] The vibration monitoring unit is an acceleration sensor.

[0034] The beneficial effects of the present application are:

[0035] 1. By continuously acquiring and recording the current working conditions of the battery pack in the electric vehicle during the charging / discharging process and driving process, and by comparing the data sent by the data module to the central control module with the preset signal threshold, the central control module sends corresponding control signals to each control unit to complete the power-off of the battery pack and simultaneously sends corresponding warning information to the driver / passenger, so as to achieve safe driving and safe use of the vehicle.

[0036] 2. By continuously acquiring and recording the overall working conditions and independent working conditions during the charging / discharging process and driving process of the electric vehicle, it can be found whether the battery pack as a whole or the battery pack shell or a certain battery element of the battery pack has a problem, so that accurate and targeted modification can be carried out, and the vehicle owner can communicate more effectively with the repair shop. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is the overall module logic diagram of the present application.

[0038] Figure 2 It is the control method step flow chart of the present application.

[0039] Figure 3 It is the specific step flow chart of step S1 of the present application.

[0040] Figure 4 It is the specific step flow chart of step SA of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only to represent selected embodiments of the present application.

[0042] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features.

[0043] The control method of the real-time monitoring safety warning system for new energy automobile energy storage batteries mainly applies to a real-time monitoring safety warning system for new energy automobile batteries, wherein the safety warning system comprises a sensing monitoring module electrically connected with a battery pack, a data acquisition module electrically connected with the sensing monitoring module, a central control module electrically connected with the data acquisition module, a terminal display screen electrically connected with the central control module, and a control unit electrically connected with the central control module. The central control module is also in communication connection with a cloud data center.

[0044] The sensing monitoring module comprises a plurality of voltage monitoring units arranged in the battery pack respectively, a temperature monitoring unit arranged in the inside of the shell of the battery pack, a strain monitoring unit arranged on each battery of the battery pack, a vibration monitoring unit arranged outside the shell of the battery pack, a current monitoring unit arranged at both ends of the battery pack, and an insulation monitoring unit arranged at the bottom of the shell of the battery pack.

[0045] The central control module comprises a CPU unit and a data processing and analysis unit, and further comprises an equalization control unit electrically connected with each battery of the battery pack, and the central control module is also electrically connected with a terminal display screen.

[0046] The control unit comprises a temperature control unit arranged in the shell of the battery pack and a battery pack circuit total switch.

[0047] Meanwhile, each battery of the battery pack is independently numbered.

[0048] Specifically, the temperature control unit is a cooling fan or a refrigerator or an independent air conditioner.

[0049] The control method of the real-time monitoring safety warning system for new energy automobile energy storage batteries provided by the present application comprises the following steps:

[0050] S1. In each charging / discharging or driving process of the electric vehicle, the sensing monitoring module continuously acquires and records the current overall working condition of the battery pack in the electric vehicle and the independent working condition of each battery unit of the battery pack.

[0051] S2. The data acquisition module continuously acquires the overall working condition and the independent working condition and records them as an overall signal and a plurality of corresponding independent signals respectively.

[0052] S3. The central control module continuously acquires the overall signal and several independent signals, respectively compares them with the preset signal threshold value inside the central control module, and sends corresponding control signals to each control unit.

[0053] As a further improvement, the overall signal includes a total voltage signal P, a total current signal I, a total temperature signal T, a total vibration signal V, and a ground insulation signal A. The independent signals include several mutually independent battery voltage signals p1, p2, p3...pn and several mutually independent strain signals N1, N2, N3...Nn, wherein the numbers of the several battery voltage signals and the several strain signals correspond one-to-one to the numbers of the respective batteries of the battery pack. The signal threshold values include a total current threshold value It, a first temperature threshold value Tt1, a second temperature threshold value Tt2, a total vibration threshold value Vt, a battery strain threshold value nt, an insulation failure threshold value At, several overcharge voltage threshold values pt1, pt2, pt3...ptn corresponding one-to-one to the respective batteries of the battery pack, and several overdischarge voltage threshold values pt1', pt2', pt3'...ptn' corresponding one-to-one to the respective batteries of the battery pack, wherein Tt1

[0054] As a further improvement, the step S1 further includes the following steps:

[0055] S101. Determine the state of the current electric vehicle and start the corresponding monitoring unit in the sensing and monitoring module;

[0056] S102. If the electric vehicle is in a charging state, start the voltage monitoring unit and the temperature monitoring unit;

[0057] If the electric vehicle is in a discharging and vehicle-stopping state, start the current monitoring unit and the temperature monitoring unit;

[0058] If the electric vehicle is in a discharging and vehicle-running state, start the current monitoring unit, the temperature monitoring unit, the strain monitoring unit, and the vibration monitoring unit;

[0059] S103. The sensing and monitoring module continuously acquires and records the current overall working condition of the battery pack in the electric vehicle and the independent working condition of each battery unit of the battery pack.

[0060] As a further improvement, the step S3 is specifically:

[0061] S301. If any one of the battery voltage signals appears pm>ptn, or pmptn', the circuit is turned off, and the energy of the battery with pm>ptn is balanced to the adjacent battery with lower voltage, or the energy of the battery with pmptn' is balanced to the adjacent battery with higher voltage, while the balancing control unit records the current voltage signals;

[0062] S302. If T>Tt1 appears, the central control module sends a cooling control signal to the temperature control unit, and the temperature control unit cools the battery pack;

[0063] S303. If T>Tt2 appears, the circuit is turned off, and the central control module sends a cooling control signal to the temperature control unit and a high temperature warning signal to the terminal display screen, and the corresponding high temperature warning image is displayed on the terminal display screen to remind the user;

[0064] S304. If I>It appears, the circuit is turned off, and the central control module sends an overcurrent warning signal to the terminal display screen, and the corresponding overcurrent warning image is displayed on the terminal display screen to remind the user;

[0065] S305. If any one of the strain signals appears Nm>nt, the circuit is turned off, and the central control module sends a battery damage warning signal to the terminal display screen, and the corresponding battery damage warning image is displayed on the terminal display screen to remind the user;

[0066] S306. If V>Vt appears, the central control module sends an over-vibration warning signal to the terminal display screen, and the corresponding over-vibration warning image is displayed on the terminal display screen to remind the user to slow down;

[0067] S307. If A<At appears, the circuit is turned off, and the central control module sends an insulation failure warning signal to the terminal display screen, and the corresponding insulation failure warning image is displayed on the terminal display screen to remind the user.

[0068] Since the operating temperature range of lead-acid batteries is usually -30~60℃, and the operating temperature range of some special lead-acid batteries with higher performance is -40~70℃, the capacity and performance of the battery will be reduced at low temperature, and the electrolyte will completely change to water at low temperature, which will cause the battery shell to deform and eventually cause the battery to fail.

[0069] Therefore, as a further improvement, the signal threshold further comprises a third temperature threshold Tt3, Tt3

[0070] The step S3 further comprises the steps of:

[0071] S308. If T < Tt3 occurs, the central control module sends a preheating signal to the temperature control unit, and the temperature control unit performs the warming work until T > Tt3, while the central control module sends a low temperature warning signal and a preheating work signal to the terminal display screen, reminding the user to wait.

[0072] As a further improvement, the central control module is further provided with a GPS positioning unit, which can obtain the geographical location information of the user under the authorization of the user, and the central control module can be bound with the user's mobile phone or other mobile terminal. The cloud data center can query the local weather, temperature and season according to the geographical location information. When the geographical location information is in high / low temperature or summer / winter season or high altitude area, the cloud data center sends a threshold adjustment signal to the central control module, and when it is in high temperature weather or summer environment, the value of the second temperature threshold Tt2 is lowered; when it is in low temperature weather or winter environment, the value of the first temperature threshold Tt1 is raised, and the values of the over-discharge voltage thresholds pt1', pt2', pt3'...ptn' are also raised. In low temperature weather, send information to the user's mobile terminal to remind the user to preheat before starting the vehicle, and the user needs to wait for a certain time for the vehicle to complete the start.

[0073] As a further improvement, the step S2 and the step S3 further comprise:

[0074] SA. The central control module obtains the current geographical location information of the vehicle and sends it to the cloud data center, and the cloud data center feeds back the corresponding threshold adjustment signal to the central control module according to the geographical location information.

[0075] The step SA specifically comprises the following steps:

[0076] SA1. If the geographic location information determines that the vehicle is located in an environment with an average temperature of less than -10℃, a high-latitude area in winter, or an area with an average altitude of more than 4000m, a low-temperature adjustment signal is sent to the central control module, and the central control module increases the value of the first temperature threshold Tt3 and the values of the over-discharge voltage thresholds pt1', pt2', pt3'...ptn'.

[0077] SA2. If the geographic location information determines that the vehicle is located in an environment with an average temperature of more than 30℃, or a low-latitude area in summer, a high-temperature adjustment signal is sent to the central control module, and the central control module decreases the values of the first temperature threshold Tt1 and the second temperature threshold Tt2.

[0078] SA3. If the geographic location information determines that the vehicle is located in an environment with an average temperature of -10-30℃, the signal thresholds in the central control module are not changed.

[0079] As a further improvement, the current monitoring unit is a Hall current sensor.

[0080] The voltage monitoring unit is a battery management chip.

[0081] The temperature monitoring unit and the strain monitoring unit are fiber Bragg grating sensors.

[0082] The vibration monitoring unit is an acceleration sensor.

[0083] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for a real-time monitoring and safety warning system for energy storage batteries of new energy vehicles, characterized in that, Includes the following steps: S1. During each charging / discharging or driving process of the electric vehicle, the sensing and monitoring module continuously acquires and records the current overall working status of the battery pack in the electric vehicle and the independent working status of each battery cell in the battery pack. S2. The data acquisition module continuously acquires the overall working status and the independent working status, and records them as an overall signal and several corresponding independent signals respectively; S3. The central control module continuously acquires the overall signal and several independent signals, compares them with the preset signal thresholds inside the central control module, and sends corresponding control signals to each control unit. The overall signals include the total voltage signal P, the total current signal I, the total temperature signal T, the total vibration signal V, and the insulation signal to ground A; The independent signals include several independent battery voltage signals p1, p2, p3... pn and several independent strain signals N1, N2, N3... Nn; The signal thresholds include a total current threshold It, a first temperature threshold Tt1, a second temperature threshold Tt2, a total vibration threshold Vt, a battery strain threshold nt, an insulation failure threshold At, several overcharge voltage thresholds pt1, pt2, pt3...ptn corresponding one-to-one with each battery in the battery pack, and several over-discharge voltage thresholds pt1', pt2', pt3'...ptn' corresponding one-to-one with each battery in the battery pack, where Tt1 < Tt2; The step between step S2 and step S3 also includes: SA. The central control module acquires the vehicle's current geographical location information and sends it to the cloud data center. The cloud data center then sends a corresponding threshold adjustment signal back to the central control module based on the geographical location information. Step SA specifically includes the following steps: SA1. If the geographical location information determines that the vehicle is in an environment with an average 24-hour temperature below -10℃, a winter in a high-latitude region, or an area with an average altitude of over 4000m, a low-temperature adjustment signal is sent to the central control module, and the central control module increases the value of the first temperature threshold Tt3, and at the same time increases the values ​​of the over-discharge voltage thresholds pt1', pt2', pt3'...ptn'. SA2. If the geographic location information determines that the vehicle is in an environment with an average 24-hour temperature higher than 30°C or in summer in a low-latitude region, a high temperature adjustment signal is sent to the central control module, and the central control module lowers the values ​​of the first temperature threshold Tt1 and the second temperature threshold Tt2. SA3. If the geographical location information indicates that the vehicle is in an environment with an average 24-hour temperature range of -10 to 30°C, the signal threshold inside the central control module will not be changed.

2. The control method of the real-time monitoring and safety early warning system for new energy vehicle energy storage batteries as described in claim 1, characterized in that, The sensing and monitoring module includes several voltage monitoring units respectively disposed within the battery pack, a temperature monitoring unit disposed inside the battery pack housing, a strain monitoring unit disposed on each battery of the battery pack, a vibration monitoring unit disposed outside the battery pack housing, current monitoring units disposed at both ends of the battery pack, and an insulation monitoring unit disposed at the bottom of the battery pack housing. The central control module includes a CPU unit and a data processing and analysis unit, as well as an equalization control unit electrically connected to each battery of the battery pack. The central control module is also electrically connected to a terminal display screen. The control unit includes a temperature control unit disposed inside the housing of the battery pack and a main switch for the battery pack circuit; Each battery in the battery pack is assigned an independent number.

3. The control method of the real-time monitoring and safety early warning system for new energy vehicle energy storage batteries as described in claim 2, characterized in that, Step S1 further includes the following steps: S101. Determine the current status of the electric vehicle and activate the corresponding monitoring unit within the sensor monitoring module; S102. If the electric vehicle is in a charging state, the voltage monitoring unit and temperature monitoring unit are activated; If the trolley is discharging and the vehicle is stopped, the current monitoring unit and temperature monitoring unit will be activated. If the trolley is discharging and the vehicle is in motion, the current monitoring unit, temperature monitoring unit, strain monitoring unit, and vibration monitoring unit will be activated. S103. The sensing and monitoring module continuously acquires and records the current overall working status of the battery pack in the electric vehicle and the independent working status of each battery cell in the battery pack.

4. The control method of the real-time monitoring and safety early warning system for new energy vehicle energy storage batteries as described in claim 3, characterized in that, Step S3 specifically involves: S301. If any of the battery voltage signals pm>ptn or pm<ptn', the circuit is turned off, and the energy in the battery with pm>ptn is transferred to the adjacent battery with a lower voltage, or the energy in the battery with pm<ptn' is transferred to the adjacent battery with a higher voltage. At the same time, the equalization control unit records the current voltage signals. S302. If T > Tt1, the central control module sends a cooling control signal to the temperature control unit, and the temperature control unit performs cooling treatment on the battery pack. S303. If T > Tt2, the circuit is shut off. At the same time, the central control module sends a cooling control signal to the temperature control unit and a high temperature warning signal to the terminal display screen. The terminal display screen displays the corresponding high temperature alarm image to remind the user. S304. If I > It, the circuit is shut off, and the central control module sends an overcurrent warning signal to the terminal display screen, which displays a corresponding overcurrent alarm image to remind the user. S305. If any of the strain signals Nm > nt, the circuit is shut off, and at the same time the central control module sends a battery damage warning signal to the terminal display screen, and the terminal display screen displays the corresponding battery damage alarm image to remind the user; S306. If V > Vt, the central control module sends an over-vibration warning signal to the terminal display screen, and the terminal display screen displays the corresponding over-vibration alarm image and reminds the user to slow down. S307. If A < At, the circuit is shut off, and the central control module sends an insulation failure warning signal to the terminal display screen, which displays a corresponding insulation failure alarm image to remind the user.

5. The control method of the real-time monitoring and safety early warning system for new energy vehicle energy storage batteries as described in claim 2, characterized in that, The current monitoring unit is a Hall current sensor; The voltage monitoring unit is a battery management chip; The temperature monitoring unit and the strain monitoring unit are fiber Bragg grating sensors; The vibration monitoring unit is an acceleration sensor.

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