A monitoring and early warning method and system for a power battery pack

Abstract

The application discloses a kind of monitoring and early warning method and monitoring and early warning system of power battery pack, belong to new energy automobile power battery technical field, the method includes vehicle insulation value monitoring and early warning, power battery pack health degree monitoring and early warning, cell thermal runaway monitoring and early warning, wherein, the vehicle insulation value monitoring and early warning is: through monitoring vehicle insulation value and vehicle insulation value drop rate vehicle insulation value early warning;The power battery pack health degree monitoring and early warning is: through monitoring the voltage of cell and the charge-discharge capacity number of cell power battery pack health degree early warning;The cell thermal runaway monitoring and early warning is: through monitoring the voltage of cell and the temperature of cell cell thermal runaway early warning.It can be monitored and early warned to power battery pack by the monitoring and early warning method and monitoring and early warning system of power battery pack of the application.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy vehicle power battery, and particularly relates to a monitoring and early warning method and system for a power battery pack. BACKGROUND

[0002] At present, existing new energy vehicles are provided with a cloud data system, which can upload vehicle data to a cloud platform for storage, but cannot analyze the data in real time and feed back the vehicle state to the user, and can only call the data for post-fault analysis after a fault occurs.

[0003] In patent CN117825957A, a fault detection method for a power battery is disclosed, which comprises the following steps: S1: collecting power battery data of a normal operation of an electric vehicle, including operation data of each single battery in the power battery pack, and establishing a power battery database; S2: screening out features related to the single battery voltage according to the collected battery data by using a correlation coefficient method; S3: establishing a real-time fault detection model for the power battery by using a machine learning algorithm based on the features extracted in S2; and S4: inputting real-time power battery data of the electric vehicle into the model trained in S3, and if the real-time single battery voltage exceeds the confidence interval output by the model in S3, it indicates that a fault has occurred, and if the real-time single battery voltage is within the confidence interval output by the model in S3, it indicates that the battery is operating normally.

[0004] However, the technology disclosed in the above patent cannot monitor and early warn the power battery pack. SUMMARY

[0005] The application aims to solve the technical problems of the prior art, and provides a monitoring and early warning method and system for a power battery pack, so as to monitor and early warn the faults of the power battery pack.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the application is as follows:

[0007] The application provides a monitoring and early warning method for a power battery pack, which comprises vehicle insulation value monitoring and early warning, power battery pack health degree monitoring and early warning, and cell thermal runaway monitoring and early warning.

[0008] Further, the vehicle insulation value monitoring and early warning specifically comprises: the monitoring and early warning system collects the vehicle insulation value and calculates the vehicle insulation value decrease rate; the monitoring and early warning system judges whether the vehicle insulation value is not less than the first insulation value threshold, if the monitoring and early warning system judges that the vehicle insulation value is not less than the first insulation value threshold, the monitoring and early warning system does not perform the first early warning action, if the monitoring and early warning system judges that the vehicle insulation value is less than the first insulation value threshold, the monitoring and early warning system judges whether the vehicle insulation value is less than the second insulation value threshold, if the monitoring and early warning system judges that the vehicle insulation value is less than the second insulation value threshold, the monitoring and early warning system performs the first early warning action, if the monitoring and early warning system judges that the vehicle insulation value is not less than the second insulation value threshold, the monitoring and early warning system judges whether the vehicle insulation value decrease rate is greater than the insulation value decrease rate threshold, if the monitoring and early warning system judges that the vehicle insulation value decrease rate is not greater than the insulation value decrease rate threshold, the monitoring and early warning system does not perform the first early warning action, if the monitoring and early warning system judges that the vehicle insulation value decrease rate is greater than the insulation value decrease rate threshold, the monitoring and early warning system performs the first early warning action.

[0009] Further, the first early warning action is that the monitoring and early warning system inputs the first early warning information to the electronic control unit (ECU), the electronic control unit (ECU) inputs the first early warning information to the remote communication terminal (T-Box) after receiving the first early warning information, the remote communication terminal (T-Box) sends the first early warning information to the automobile remote service provider (TSP) platform, and the automobile remote service provider (TSP) platform sends the first early warning information to the terminal device.

[0010] Further, the health degree monitoring and early warning of the power battery pack specifically comprises: the monitoring and early warning system collects the charge and discharge capacity number of the battery cell and the minimum voltage of the battery cell meeting the preset condition; the monitoring and early warning system calculates the first health degree of the power battery pack through the minimum voltage of the battery cell, calculates the second health degree of the power battery pack through the charge and discharge capacity number of the battery cell, calculates the health degree of the power battery pack through the first health degree of the power battery pack and the second health degree of the power battery pack, and judges whether the health degree of the power battery pack is less than the health degree threshold, if the monitoring and early warning system judges that the health degree of the power battery pack is less than the health degree threshold, the monitoring and early warning system performs the second early warning action, if the monitoring and early warning system judges that the health degree of the power battery pack is not less than the health degree threshold, the monitoring and early warning system does not perform the second early warning action.

[0011] Further, the second early warning action is that the monitoring early warning system inputs the second early warning information to an electronic control unit (ECU); the electronic control unit (ECU) inputs the second early warning information to a remote communication terminal (T-Box) after receiving the second early warning information; the remote communication terminal (T-Box) sends the second early warning information to a vehicle remote service provider (TSP) platform; and the vehicle remote service provider (TSP) platform sends the second early warning information to a terminal device.

[0012] Further, the preset condition is that the time for the power battery pack to be placed in a full charge state is greater than a preset time.

[0013] Further, the preset time is 30 minutes.

[0014] Further, the cell thermal runaway monitoring and early warning specifically includes that the monitoring early warning system collects the voltage of the cell and the temperature of the cell and calculates the temperature rise rate of the cell and the temperature difference of the cell; the monitoring early warning system judges whether the voltage of the cell is less than a first voltage threshold value and whether the temperature of the cell is greater than a first temperature threshold value; if the monitoring early warning system judges that the voltage of the cell is less than the first voltage threshold value and judges that the temperature of the cell is greater than the first temperature threshold value, the monitoring early warning system performs a third early warning action; otherwise, the monitoring early warning system judges whether the voltage of the cell is less than the first voltage threshold value and whether the temperature rise rate of the cell is greater than a temperature rise rate threshold value; if the monitoring early warning system judges that the voltage of the cell is less than the first voltage threshold value and judges that the temperature rise rate of the cell is greater than the temperature rise rate threshold value, the monitoring early warning system performs the third early warning action; otherwise, the monitoring early warning system judges whether the voltage of the cell is less than the first voltage threshold value and whether the temperature difference of the cell is greater than a temperature difference threshold value; if the monitoring early warning system judges that the voltage of the cell is less than the first voltage threshold value and judges that the temperature difference of the cell is greater than the temperature difference threshold value, the monitoring early warning system performs the third early warning action; otherwise, the monitoring early warning system does not perform the third early warning action.

[0015] Further, the third early warning action is that the monitoring early warning system inputs the third early warning information to an electronic control unit (ECU); the electronic control unit (ECU) inputs the third early warning information to a remote communication terminal (T-Box) after receiving the second early warning information; the remote communication terminal (T-Box) sends the third early warning information to a vehicle remote service provider (TSP) platform; and the vehicle remote service provider (TSP) platform sends the third early warning information to a terminal device.

[0016] The application further provides a monitoring and early warning system of a power battery pack, which comprises a battery management system (BMS), a current sensor, a master control chip, an electronic control unit (ECU) and a remote communication terminal (T-Box), the input end of the master control chip is connected with the output end of the battery management system (BMS) and the output end of the current sensor respectively, the output end of the master control chip is connected with the input end of the electronic control unit (ECU), and the output end of the electronic control unit (ECU) is connected with the input end of the remote communication terminal (T-Box).

[0017] The monitoring and early warning method and the monitoring and early warning system have the following advantages:

[0018] (1) The monitoring and early warning method and the monitoring and early warning system can monitor and early warn the power battery pack.

[0019] (2) The monitoring and early warning method and the monitoring and early warning system can monitor whether the vehicle insulation value is abnormal and make early warning and timely remind the user.

[0020] (3) The monitoring and early warning method and the monitoring and early warning system can monitor the health degree of the power battery pack and make early warning and timely remind the user according to whether the health degree is less than the health degree threshold.

[0021] (4) The monitoring and early warning method and the monitoring and early warning system can monitor whether the cell is thermal runaway and make early warning and timely remind the user.

[0022] (5) The monitoring and early warning method and the monitoring and early warning system can prevent safety accidents after monitoring and early warning the power battery pack. DETAILED DESCRIPTION

[0023] The present specification includes the following drawings, and the shown contents are respectively:

[0024] Figure 1 It is a logic block diagram of the monitoring and early warning method of the power battery pack of the application;

[0025] Figure 2 It is a vehicle insulation value monitoring and early warning flow chart of the monitoring and early warning method of the power battery pack of the application;

[0026] Figure 3 It is a health degree monitoring and early warning flow chart of the power battery pack of the monitoring and early warning method of the power battery pack of the application;

[0027] Figure 4 It is a cell thermal runaway monitoring and early warning flow chart of the monitoring and early warning method of the power battery pack of the application;

[0028] Figure 5Is a logic structure block diagram of a monitoring and early warning system of a power battery pack of the present application.

[0029] Marked with a figure: 1, battery management system (BMS); 2, current sensor; 3, main control chip; 4, electronic control unit (ECU); 5, remote communication terminal (T-Box). DETAILED DESCRIPTION

[0030] The specific embodiments of the present application will be further described below with reference to the drawings, and the purpose is to help the technical personnel in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present application, and to help its implementation.

[0031] Figure 1 Is a logic block diagram of a monitoring and early warning method of a power battery pack of the present application, and the monitoring and early warning method of the power battery pack of the present application includes vehicle insulation value monitoring and early warning, power battery pack health degree monitoring and early warning, and cell thermal runaway monitoring and early warning, wherein the vehicle insulation value monitoring and early warning is: vehicle insulation value early warning is carried out by monitoring the vehicle insulation value and the vehicle insulation value decline rate; the power battery pack health degree monitoring and early warning is: power battery pack health degree early warning is carried out by monitoring the voltage of the cell and the charge and discharge capacity number of the cell; the cell thermal runaway monitoring and early warning is: cell thermal runaway early warning is carried out by monitoring the voltage of the cell and the temperature of the cell; that is, corresponding to the content in the Figure 1 .

[0032] Figure 2 Is a vehicle insulation value monitoring and early warning flow chart of a monitoring and early warning method of a power battery pack of the present application, and the vehicle insulation value monitoring and early warning flow chart of the monitoring and early warning method of the power battery pack of the present application includes the following steps: Figure 2It can be seen that the vehicle insulation value monitoring and early warning specifically comprises: the monitoring and early warning system collects the vehicle insulation value and calculates the vehicle insulation value decrease rate; the monitoring and early warning system judges whether the vehicle insulation value is not less than the first insulation value threshold, if the monitoring and early warning system judges that the vehicle insulation value is not less than the first insulation value threshold, the monitoring and early warning system does not perform the first early warning action, if the monitoring and early warning system judges that the vehicle insulation value is less than the first insulation value threshold, the monitoring and early warning system judges whether the vehicle insulation value is less than the second insulation value threshold, if the monitoring and early warning system judges that the vehicle insulation value is less than the second insulation value threshold, the monitoring and early warning system performs the first early warning action, if the monitoring and early warning system judges that the vehicle insulation value is not less than the second insulation value threshold, the monitoring and early warning system judges whether the vehicle insulation value decrease rate is greater than the insulation value decrease rate threshold, if the monitoring and early warning system judges that the vehicle insulation value decrease rate is not greater than the insulation value decrease rate threshold, the monitoring and early warning system does not perform the first early warning action, if the monitoring and early warning system judges that the vehicle insulation value decrease rate is greater than the insulation value decrease rate threshold, the monitoring and early warning system performs the first early warning action. Wherein, the first early warning action is that the monitoring and early warning system inputs the first early warning information to the electronic control unit (ECU) 4; the electronic control unit (ECU) 4 inputs the first early warning information to the remote communication terminal (T-Box) 5 after receiving the first early warning information; the remote communication terminal (T-Box) 5 sends the first early warning information to the automobile remote service provider (TSP) platform; the automobile remote service provider (TSP) platform sends the first early warning information to the terminal device.

[0033] More specifically, the vehicle insulation value of the high-voltage loop is detected and collected by the insulation value detection module in the battery management system (BMS) 1, and the detected and collected vehicle insulation value data is input to the master control chip 3. After receiving the vehicle insulation value data input by the insulation value detection module, the master control chip 3 will determine whether the vehicle insulation value is not less than the first insulation value threshold. If the master control chip 3 determines that the vehicle insulation value is not less than the first insulation value threshold, the master control chip 3 will not perform the first warning action, thereby realizing the function of monitoring whether the vehicle insulation value is abnormal and making a timely warning to remind the user. If the master control chip 3 determines that the vehicle insulation value is less than the first insulation value threshold, the master control chip 3 will further determine whether the vehicle insulation value is less than the second insulation value threshold. If the master control chip 3 determines that the vehicle insulation value is less than the second insulation value threshold, the master control chip 3 will perform the first warning action, thereby realizing the function of monitoring whether the vehicle insulation value is abnormal and making a timely warning to remind the user. If the master control chip 3 determines that the vehicle insulation value is not less than the second insulation value threshold, the master control chip 3 will further determine whether the vehicle insulation value input by the battery management system (BMS) 1 is greater than the insulation value drop rate threshold. If the master control chip 3 determines that the vehicle insulation value drop rate is not greater than the insulation value drop rate threshold, the master control chip 3 will not perform the first warning action. If the master control chip 3 determines that the vehicle insulation value drop rate is greater than the insulation value drop rate threshold, the master control chip 3 will perform the first warning action, thereby realizing the function of monitoring whether the vehicle insulation value is abnormal and making a timely warning to remind the user. That is, the power battery pack can be monitored and warned to prevent safety accidents. The first warning action is that the master control chip 3 inputs the first warning information to the electronic control unit (ECU) 4; the electronic control unit (ECU) 4 inputs the first warning information to the remote communication terminal (T-Box) 5 after receiving the first warning information; the remote communication terminal (T-Box) 5 sends the first warning information to the automobile remote service provider (TSP) platform; the automobile remote service provider (TSP) platform sends the first warning information to the terminal device to remind the user that the vehicle insulation value is abnormal.

[0034] The first warning information is that the vehicle insulation value is abnormal.

[0035] In addition, the first insulation value threshold is 10MΩ; the second insulation value threshold is 1MΩ; and the insulation value drop rate threshold is 10KΩ / S.

[0036] Figure 3 The health degree monitoring and warning process block diagram of the power battery pack of the power battery pack monitoring and warning method is as follows, Figure 3It can be seen that the health degree monitoring and early warning of the power battery pack specifically comprises that the monitoring and early warning system collects the charge and discharge capacity number of the battery cell and the minimum voltage of the battery cell meeting the preset condition; the monitoring and early warning system calculates the first health degree of the power battery pack through the minimum voltage of the battery cell, the monitoring and early warning system calculates the second health degree of the power battery pack through the charge and discharge capacity number of the battery cell, the monitoring and early warning system calculates the health degree of the power battery pack through the first health degree of the power battery pack and the second health degree of the power battery pack, the monitoring and early warning system judges whether the health degree of the power battery pack is less than the health degree threshold, if the monitoring and early warning system judges that the health degree of the power battery pack is less than the health degree threshold, the monitoring and early warning system performs the second early warning action, if the monitoring and early warning system judges that the health degree of the power battery pack is not less than the health degree threshold, the monitoring and early warning system does not perform the second early warning action. The second early warning action is that the monitoring and early warning system inputs the second early warning information to the electronic control unit (ECU) 4; the electronic control unit (ECU) 4 inputs the second early warning information to the remote communication terminal (T-Box) 5 after receiving the second early warning information; the remote communication terminal (T-Box) 5 sends the second early warning information to the automobile remote service provider (TSP) platform; the automobile remote service provider (TSP) platform sends the second early warning information to the terminal device. In addition, the above-mentioned monitoring and early warning system calculates the health degree of the power battery pack through the first health degree of the power battery pack and the second health degree of the power battery pack refers to that the monitoring and early warning system obtains the health degree of the power battery pack by calculating the arithmetic mean of the first health degree of the power battery pack and the second health degree of the power battery pack.

[0037] More specifically, first, the power battery pack needs to meet the preset conditions. The voltage acquisition module in the battery management system (BMS) 1 collects the voltage of the battery cell through the voltage sampling point, and inputs the collected voltage data of the battery cell to the master control chip 3. The master control chip 3 screens the lowest voltage of the battery cell from the voltage data of the battery cell received by it. The master control chip 3 queries the corresponding power battery pack capacity value from the battery cell OCV table according to the lowest voltage of the battery cell. The master control chip 3 divides the queried power battery pack capacity value by the rated capacity value of the power battery pack to obtain the first health degree of the power battery pack. The battery management system (BMS) 1 collects the current data collected by the current sensor 2 in the high-voltage loop, and calculates the cumulative charge-discharge capacity value of the battery cell by integrating the current with respect to time, and inputs the calculated cumulative charge-discharge capacity value information of the battery cell to the master control chip 3. The master control chip 3 divides the cumulative charge-discharge capacity value of the battery cell by the cumulative rated charge-discharge capacity value of the power battery pack to obtain the second health degree of the power battery pack, wherein the cumulative rated charge-discharge capacity value of the power battery pack is equal to the rated capacity of the power battery pack multiplied by the charge-discharge cycle number. The power battery pack completes one charge-discharge for each charge-discharge cycle number. The master control chip 3 calculates the health degree of the power battery pack by the first health degree of the power battery pack and the second health degree of the power battery pack. The master control chip 3 will judge whether the health degree of the power battery pack is less than the health degree threshold. If the master control chip 3 judges that the health degree of the power battery pack is less than the health degree threshold, the master control chip 3 performs the second warning action, thereby being able to monitor the health degree of the power battery pack and make a warning and timely remind the user according to whether it is less than the health degree threshold. If the master control chip 3 judges that the health degree of the power battery pack is not less than the health degree threshold, the master control chip 3 does not perform the second warning action. That is, it can realize monitoring and warning of the power battery pack to prevent safety accidents. Among them, the second warning action is that the master control chip 3 inputs the second warning information to the electronic control unit (ECU) 4; the electronic control unit (ECU) 4 inputs the second warning information to the remote communication terminal (T-Box) 5 after receiving the second warning information; the remote communication terminal (T-Box) 5 sends the second warning information to the automobile remote service provider (TSP) platform; the automobile remote service provider (TSP) platform sends the second warning information to the terminal device. In addition, the above-mentioned master control chip 3 calculates the health degree of the power battery pack by the first health degree of the power battery pack and the second health degree of the power battery pack, which means that the master control chip 3 obtains the health degree of the power battery pack by calculating the arithmetic mean of the first health degree of the power battery pack and the second health degree of the power battery pack.

[0038] Among them, the above-mentioned second warning information is that the health degree of the power battery pack is less than the health degree threshold.

[0039] In addition, the above-mentioned health degree threshold is that the SOH of the power battery pack is 70%.

[0040] In addition, the preset condition is that the power battery pack is placed for more than 30 minutes in the full charge state.

[0041] Figure 4 is a cell thermal runaway monitoring and early warning process block diagram of a power battery pack monitoring and early warning method of the application, which comprises Figure 4 It can be seen that the cell thermal runaway monitoring and early warning specifically comprises that the monitoring and early warning system collects the voltage of the cell and the temperature of the cell and calculates the temperature rise rate of the cell and the temperature difference of the cell; the monitoring and early warning system judges whether the voltage of the cell is less than the first voltage threshold value and judges whether the temperature of the cell is greater than the first temperature threshold value, if the monitoring and early warning system judges that the voltage of the cell is less than the first voltage threshold value and judges that the temperature of the cell is greater than the first temperature threshold value, the monitoring and early warning system performs the third warning action, otherwise, the monitoring and early warning system judges whether the voltage of the cell is less than the first voltage threshold value and judges whether the temperature rise rate of the cell is greater than the temperature rise rate threshold value, if the monitoring and early warning system judges that the voltage of the cell is less than the first voltage threshold value and judges that the temperature rise rate of the cell is greater than the temperature rise rate threshold value, the monitoring and early warning system performs the third warning action, otherwise, the monitoring and early warning system judges whether the voltage of the cell is less than the first voltage threshold value and judges whether the temperature difference of the cell is greater than the temperature difference threshold value, if the monitoring and early warning system judges that the voltage of the cell is less than the first voltage threshold value and judges that the temperature difference of the cell is greater than the temperature difference threshold value, the monitoring and early warning system performs the third warning action, otherwise, the monitoring and early warning system does not perform the third warning action. The third warning action is that the monitoring and early warning system inputs the third warning information to the electronic control unit (ECU) 4; the electronic control unit (ECU) 4 inputs the third warning information to the remote communication terminal (T-Box) 5 after receiving the second warning information; the remote communication terminal (T-Box) 5 sends the third warning information to the automobile remote service provider (TSP) platform; the automobile remote service provider (TSP) platform sends the third warning information to the terminal device.

[0042] More specifically, the voltage and temperature of the battery cell are collected by the voltage temperature collection module in the battery management system (BMS) 1, and the collected voltage and temperature data of the battery cell are input to the master control chip 3. After receiving the voltage and temperature of the battery cell input by the voltage temperature collection module, the master control chip 3 will determine whether the voltage of the battery cell is less than the first voltage threshold value and whether the temperature of the battery cell is greater than the first temperature threshold value. If the master control chip 3 determines that the voltage of the battery cell is less than the first voltage threshold value and the temperature of the battery cell is greater than the first temperature threshold value, the master control chip 3 will perform the third warning action, thereby being able to monitor whether the battery cell is in thermal runaway and make a timely warning to remind the user. Otherwise, the master control chip 3 will further determine whether the voltage of the battery cell is less than the first voltage threshold value and whether the temperature rise rate of the battery cell input by the battery management system (BMS) 1 is greater than the temperature rise rate threshold value. If the master control chip 3 determines that the voltage of the battery cell is less than the first voltage threshold value and the temperature rise rate of the battery cell is greater than the temperature rise rate threshold value, the master control chip 3 performs the third warning action, thereby being able to monitor whether the battery cell is in thermal runaway and make a timely warning to remind the user. Otherwise, the master control chip 3 will further determine whether the voltage of the battery cell is less than the first voltage threshold value and whether the temperature difference of the battery cell input by the battery management system (BMS) 1 is greater than the temperature difference threshold value. If the master control chip 3 determines that the voltage of the battery cell is less than the first voltage threshold value and the temperature difference of the battery cell is greater than the temperature difference threshold value, the master control chip 3 performs the third warning action, thereby being able to monitor whether the battery cell is in thermal runaway and make a timely warning to remind the user. Otherwise, the master control chip 3 does not perform the third warning action. That is, it can realize monitoring and warning of the power battery pack to prevent safety accidents. Among them, the third warning action is that the master control chip 3 inputs the third warning information to the electronic control unit (ECU) 4; the electronic control unit (ECU) 4 inputs the third warning information to the remote communication terminal (T-Box) 5 after receiving the second warning information; the remote communication terminal (T-Box) 5 sends the third warning information to the automobile remote service provider (TSP) platform; the automobile remote service provider (TSP) platform sends the third warning information to the terminal device.

[0043] Among them, the third warning information is that the battery cell is in thermal runaway.

[0044] In addition, the first voltage threshold value is 1.8V; the first temperature threshold value is 65℃; the temperature rise rate threshold value is 2℃ / S, and the temperature difference threshold value is 30℃.

[0045] Figure 5It is a logic structure block diagram of a monitoring and early warning system of a power battery pack of the present application, comprising a battery management system (BMS) 1, a current sensor 2, a main control chip 3, an electronic control unit (ECU) 4, a remote communication terminal (T-Box) 5, wherein the input end of the main control chip 3 is connected with the output end of the battery management system (BMS) 1 and the output end of the current sensor 2 respectively; the output end of the main control chip 3 is connected with the input end of the electronic control unit (ECU) 4; the output end of the electronic control unit (ECU) 4 is connected with the input end of the remote communication terminal (T-Box) 5.

[0046] In addition, in the present specific embodiment, the main control chip 3 can adopt a microcontroller (MCU); the terminal device can adopt a smart phone, a tablet computer and the like.

[0047] Effects of the embodiment

[0048] The vehicle insulation value of the high-voltage loop is detected and collected by the insulation value detection module in the battery management system (BMS) 1, and the detected and collected vehicle insulation value data is input to the main control chip 3. After receiving the vehicle insulation value data input by the insulation value detection module, the main control chip 3 judges whether the vehicle insulation value is not less than the first insulation value threshold. If the main control chip 3 judges that the vehicle insulation value is not less than the first insulation value threshold, the main control chip 3 does not perform the first early warning action, thereby realizing the function of monitoring whether the vehicle insulation value is abnormal and making early warning and timely reminding the user. If the main control chip 3 judges that the vehicle insulation value is less than the first insulation value threshold, the main control chip 3 will further judge whether the vehicle insulation value is less than the second insulation value threshold. If the main control chip 3 judges that the vehicle insulation value is less than the second insulation value threshold, the main control chip 3 performs the first early warning action, thereby realizing the function of monitoring whether the vehicle insulation value is abnormal and making early warning and timely reminding the user. If the main control chip 3 judges that the vehicle insulation value is not less than the second insulation value threshold, the main control chip 3 will further judge whether the vehicle insulation value input by the battery management system (BMS) 1 is greater than the insulation value drop rate threshold. If the main control chip 3 judges that the vehicle insulation value drop rate is not greater than the insulation value drop rate threshold, the main control chip 3 does not perform the first early warning action. If the main control chip 3 judges that the vehicle insulation value drop rate is greater than the insulation value drop rate threshold, the main control chip 3 performs the first early warning action, thereby realizing the function of monitoring whether the vehicle insulation value is abnormal and making early warning and timely reminding the user. That is, the power battery pack can be monitored and early warned to prevent safety accidents.

[0049] First, the power battery pack meets the preset conditions, the voltage acquisition module in the battery management system (BMS) 1 collects the voltage of the battery cell through the voltage sampling point, and inputs the collected voltage data of the battery cell to the main control chip 3. The main control chip 3 screens the lowest voltage of the battery cell from the voltage data of the battery cell received by it, and the main control chip 3 queries the corresponding power battery pack capacity value according to the lowest voltage of the battery cell through the battery cell OCV table. The main control chip 3 divides the queried power battery pack capacity value by the rated capacity value of the power battery pack to obtain the first health degree of the power battery pack; the battery management system (BMS) 1 collects the current data collected by the current sensor 2 in the high-voltage loop, and calculates the cumulative charge and discharge capacity value of the battery cell by integrating the current with respect to time, and inputs the calculated cumulative charge and discharge capacity value of the battery cell to the main control chip 3. The main control chip 3 divides the cumulative charge and discharge capacity value of the battery cell by the cumulative rated charge and discharge capacity value of the power battery pack to obtain the second health degree of the power battery pack, wherein the cumulative rated charge and discharge capacity value of the power battery pack is equal to the rated capacity of the power battery pack multiplied by the charge and discharge cycle number, and the power battery pack is counted as a charge and discharge cycle number each time it completes a charge and discharge. The main control chip 3 calculates the health degree of the power battery pack through the first health degree of the power battery pack and the second health degree of the power battery pack. The main control chip 3 will judge whether the health degree of the power battery pack is less than the health degree threshold value. If the main control chip 3 judges that the health degree of the power battery pack is less than the health degree threshold value, the main control chip 3 performs the second warning action, thereby being able to monitor the health degree of the power battery pack and make a warning and timely remind the user according to whether it is less than the health degree threshold value. If the main control chip 3 judges that the health degree of the power battery pack is not less than the health degree threshold value, the main control chip 3 does not perform the second warning action. That is, it can realize monitoring and warning of the power battery pack to prevent safety accidents.

[0050] The voltage and temperature of the battery cell are collected by a voltage temperature collection module in the battery management system (BMS) 1, and the collected voltage and temperature data of the battery cell are input to the main control chip 3. After receiving the voltage and temperature of the battery cell input by the voltage temperature collection module, the main control chip 3 will determine whether the voltage of the battery cell is less than the first voltage threshold value and whether the temperature of the battery cell is greater than the first temperature threshold value. If the main control chip 3 determines that the voltage of the battery cell is less than the first voltage threshold value and the temperature of the battery cell is greater than the first temperature threshold value, the main control chip 3 will perform a third warning action, thereby being able to monitor whether the battery cell is in thermal runaway and make a timely warning and remind the user, otherwise, the main control chip 3 will further determine whether the voltage of the battery cell is less than the first voltage threshold value and whether the temperature rise rate of the battery cell input by the battery management system (BMS) 1 is greater than the temperature rise rate threshold value. If the main control chip 3 determines that the voltage of the battery cell is less than the first voltage threshold value and the temperature rise rate of the battery cell is greater than the temperature rise rate threshold value, the main control chip 3 performs a third warning action, thereby being able to monitor whether the battery cell is in thermal runaway and make a timely warning and remind the user, otherwise, the main control chip 3 will further determine whether the voltage of the battery cell is less than the first voltage threshold value and whether the temperature difference of the battery cell input by the battery management system (BMS) 1 is greater than the temperature difference threshold value. If the main control chip 3 determines that the voltage of the battery cell is less than the first voltage threshold value and the temperature difference of the battery cell is greater than the temperature difference threshold value, the main control chip 3 performs a third warning action, thereby being able to monitor whether the battery cell is in thermal runaway and make a timely warning and remind the user, otherwise, the main control chip 3 does not perform a third warning action to prevent safety accidents.

[0051] The application is described above with reference to the drawings. Obviously, the specific implementation of the application is not limited to the above-described manner. As long as various non-essential improvements are made using the inventive concept and technical solutions of the application, or the above-described concept and technical solutions of the application are directly applied to other occasions without improvement, they are all within the protection scope of the application.

Claims

1. A monitoring and early warning method for a power battery pack, characterized by: Including vehicle insulation value monitoring and early warning, power battery pack health monitoring and early warning, battery cell thermal runaway monitoring and early warning, The vehicle insulation value monitoring and early warning is: vehicle insulation value early warning is performed by monitoring the vehicle insulation value and the vehicle insulation value decreasing rate; The health monitoring and early warning of the power battery pack is as follows: the health warning of the power battery pack is performed by monitoring the voltage of the battery cell and the charge and discharge capacity of the battery cell; The battery cell thermal runaway monitoring and early warning is: performing battery cell thermal runaway early warning by monitoring the battery cell voltage and battery cell temperature; The battery cell thermal runaway monitoring and warning is specifically as follows: the monitoring and warning system collects the voltage and temperature of the battery cell and calculates the temperature rise rate of the battery cell and the temperature difference of the battery cell; the monitoring and warning system determines whether the voltage of the battery cell is less than a first voltage threshold and whether the temperature of the battery cell is greater than a first temperature threshold. If the monitoring and warning system determines that the voltage of the battery cell is less than the first voltage threshold and the temperature of the battery cell is greater than the first temperature threshold, the monitoring and warning system performs a third warning action; otherwise, the monitoring and warning system determines whether the voltage of the battery cell is less than the first voltage threshold and whether the temperature rise rate of the battery cell is greater than the temperature rise rate threshold. If the monitoring and warning system determines that the voltage of the battery cell is less than the first voltage threshold and the temperature rise rate of the battery cell is greater than the temperature rise rate threshold, the monitoring and warning system performs the third warning action; otherwise, the monitoring and warning system determines whether the voltage of the battery cell is less than the first voltage threshold and whether the temperature difference of the battery cell is greater than the temperature difference threshold. If the monitoring and warning system determines that the voltage of the battery cell is less than the first voltage threshold and the temperature difference of the battery cell is greater than the temperature difference threshold, the monitoring and warning system performs the third warning action; otherwise, the monitoring and warning system does not perform the third warning action.

2. The power battery pack monitoring and early warning method according to claim 1, characterized in that: The vehicle insulation value monitoring and warning is specifically as follows: the monitoring and warning system collects the vehicle insulation value and calculates the vehicle insulation value decrease rate; the monitoring and warning system determines whether the vehicle insulation value is not less than a first insulation value threshold. If the monitoring and warning system determines that the vehicle insulation value is not less than the first insulation value threshold, the monitoring and warning system does not perform the first warning action. If the monitoring and warning system determines that the vehicle insulation value is less than the first insulation value threshold, the monitoring and warning system determines whether the vehicle insulation value is less than a second insulation value threshold. If the monitoring and warning system determines that the vehicle insulation value is less than the second insulation value threshold, the monitoring and warning system performs the first warning action. If the monitoring and warning system determines that the vehicle insulation value is not less than the second insulation value threshold, the monitoring and warning system determines whether the vehicle insulation value decrease rate is greater than the insulation value decrease rate threshold. If the monitoring and warning system determines that the vehicle insulation value decrease rate is not greater than the insulation value decrease rate threshold, the monitoring and warning system does not perform the first warning action. If the monitoring and warning system determines that the vehicle insulation value decrease rate is greater than the insulation value decrease rate threshold, the monitoring and warning system performs the first warning action.

3. The power battery pack monitoring and early warning method according to claim 2, characterized in that: The first warning action is that the monitoring warning system inputs a first warning information to the electronic control unit; the electronic control unit inputs the first warning information to the remote communication terminal after receiving the first warning information; the remote communication terminal sends the first warning information to the automobile remote service provider platform; The automobile remote service provider platform sends a first warning message to the terminal device.

4. The power battery pack monitoring and early warning method according to claim 1, characterized in that: The health monitoring and early warning system of the power battery pack is specifically as follows: the monitoring and early warning system collects the charge and discharge capacity of the battery cell and the minimum voltage of the battery cell that meets the preset conditions; The monitoring and early warning system calculates the first health of the power battery pack through the minimum voltage of the battery cell, and calculates the second health of the power battery pack through the charge and discharge capacity of the battery cell. The monitoring and early warning system calculates the health of the power battery pack through the first health of the power battery pack and the second health of the power battery pack. The monitoring and early warning system determines whether the health of the power battery pack is less than the health threshold. If the monitoring and early warning system determines that the health of the power battery pack is less than the health threshold, the monitoring and early warning system performs the second early warning action. If the monitoring and early warning system determines that the health of the power battery pack is not less than the health threshold, the monitoring and early warning system does not perform the second early warning action.

5. The power battery pack monitoring and early warning method according to claim 4, characterized in that: The second warning action is that the monitoring warning system inputs a second warning information to the electronic control unit; the electronic control unit inputs the second warning information to the remote communication terminal after receiving the second warning information; the remote communication terminal sends the second warning information to the automobile remote service provider platform; The automobile remote service provider platform sends a second warning message to the terminal device.

6. The power battery pack monitoring and early warning method according to claim 4, characterized in that: The preset condition is that the power battery pack has been stationary for a time greater than a preset time in a fully charged state.

7. The power battery pack monitoring and early warning method according to claim 6, characterized in that: The preset time is 30 minutes.

8. The power battery pack monitoring and early warning method according to claim 1, characterized in that: The third warning action is that the monitoring warning system inputs a third warning information to the electronic control unit; the electronic control unit inputs the third warning information to the remote communication terminal after receiving the second warning information; the remote communication terminal sends the third warning information to the automobile remote service provider platform; The automobile remote service provider platform sends a third warning message to the terminal device.

9. A monitoring and early warning system for a power battery pack according to any one of claims 1 to 8, characterized in that: It includes a battery management system, a current sensor, a main control chip, an electronic control unit, and a remote communication terminal. The input end of the main control chip is connected to the output end of the battery management system and the output end of the current sensor respectively; the output end of the main control chip is connected to the input end of the electronic control unit; and the output end of the electronic control unit is connected to the input end of the remote communication terminal.

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