Monitoring and early warning method and monitoring and early warning system for power battery pack

Abstract

The invention discloses a monitoring and early warning method and a monitoring and early warning system for a power battery pack, and belongs to the technical field of new energy automobile power batteries, the method comprises vehicle insulation value monitoring and early warning, power battery pack health degree monitoring and early warning, and battery cell thermal runaway monitoring and early warning, the vehicle insulation value monitoring and early warning comprises the following steps: carrying out vehicle insulation value early warning by monitoring a vehicle insulation value and a vehicle insulation value drop rate; the health degree monitoring and early warning of the power battery pack is that the health degree early warning of the power battery pack is carried out by monitoring the voltage of a battery cell and the charge and discharge capacity of the battery cell; the battery cell thermal runaway monitoring and early warning comprises the step of performing battery cell thermal runaway early warning by monitoring the voltage and the temperature of the battery cell. According to the monitoring and early warning method and the monitoring and early warning system for the power battery pack, monitoring and early warning can be carried out on the power battery pack.

Description

Technical Field

[0001] The present invention belongs to the technical field of power batteries for new energy vehicles. Specifically, the present invention relates to a monitoring and early warning method and a monitoring and early warning system for a power battery pack. Background Art

[0002] At present, existing new energy vehicle models are all equipped with a cloud data system. The system can upload the entire vehicle data to the cloud platform for storage, but it cannot analyze the data in real time and feedback the vehicle status to the user. It can only retrieve the data for post-analysis after a failure occurs.

[0003] Patent CN117825957A discloses a method for fault detection of a power battery, which includes: S1: collecting power battery data of normal operation of an electric vehicle, including operation data of each cell in a power battery pack, and establishing a power battery database; S2: based on the collected battery data, using a correlation coefficient method to screen out features related to cell voltage; S3: based on the features extracted in S2, using a machine learning algorithm to establish a real-time fault detection model for a power battery; S4: inputting the real-time power battery data of the electric vehicle into a trained model in S3, if the real-time cell voltage exceeds the confidence interval output by the model in S3, it indicates that a fault has occurred; if the real-time cell 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 warn the power battery pack. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a monitoring and early warning method and a monitoring and early warning system for a power battery pack in view of the deficiencies in the prior art, so as to achieve the purpose of monitoring and early warning of power battery pack failures.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a monitoring and early warning method for a power battery pack, including vehicle insulation value monitoring and early warning, power battery pack health monitoring and early warning, and battery cell thermal runaway monitoring and early warning, wherein the vehicle insulation value monitoring and early warning comprises: performing vehicle insulation value early warning by monitoring the vehicle insulation value and the vehicle insulation value decrease rate; the power battery pack health monitoring and early warning comprises: performing power battery pack health early warning by monitoring the battery cell voltage and the battery cell charge and discharge capacity; and the battery cell thermal runaway monitoring and early warning comprises: performing battery cell thermal runaway early warning by monitoring the battery cell voltage and the battery cell temperature.

[0008] Further, the vehicle insulation value monitoring and early warning is specifically as follows: 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 determines whether the vehicle insulation value is not less than the first insulation value threshold. If the monitoring and early warning system determines 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 determines that the vehicle insulation value is less than the first insulation value threshold, the monitoring and early warning system determines whether the vehicle insulation value is less than the second insulation value threshold. If the monitoring and early warning system determines 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 determines that the vehicle insulation value is not less than the second insulation value threshold, the monitoring and early warning system determines whether the vehicle insulation value decrease rate is greater than the insulation value decrease rate threshold. If the monitoring and early warning system determines 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 determines 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] Furthermore, the first warning action is that the monitoring warning system inputs the first warning information to the electronic control unit (ECU); the electronic control unit (ECU) inputs the first warning information to the remote communication terminal (T-Box) after receiving the first warning information; the remote communication terminal (T-Box) 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.

[0010] Furthermore, the monitoring and early warning of the health of the power battery pack is specifically as follows: the monitoring and early warning system collects the charge and discharge capacity of the battery cells and the minimum voltage of the battery cells that meets preset conditions; the monitoring and early warning system calculates a first health of the power battery pack through the minimum voltage of the battery cells, the monitoring and early warning system calculates a second health of the power battery pack through the charge and discharge capacity of the battery cells, 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 a 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 a 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.

[0011] Furthermore, the second warning action is that the monitoring warning system inputs the second warning information to the electronic control unit (ECU); the electronic control unit (ECU) inputs the second warning information to the remote communication terminal (T-Box) after receiving the second warning information; the remote communication terminal (T-Box) 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.

[0012] Furthermore, the preset condition is that the power battery pack is kept at rest for a time greater than a preset time in a fully charged state.

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

[0014] Further, the monitoring and early warning of thermal runaway of the battery cell is specifically as follows: the monitoring and early warning system collects the voltage of the battery cell and the 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 early warning system determines whether the voltage of the battery cell is less than the first voltage threshold and determines whether the temperature of the battery cell is greater than the first temperature threshold. If the monitoring and early warning system determines that the voltage of the battery cell is less than the first voltage threshold and determines that the temperature of the battery cell is greater than the first temperature threshold, the monitoring and early warning system performs a third early warning action; otherwise, the monitoring and early warning system determines whether the voltage of the battery cell is less than the first voltage threshold and determines whether the temperature rise rate of the battery cell is greater than the temperature rise rate threshold. If the monitoring and early warning system determines that the voltage of the battery cell is less than the first voltage threshold and determines that the temperature rise rate of the battery cell is greater than the temperature rise rate threshold, the monitoring and early warning system performs the third early warning action; otherwise, the monitoring and early warning system determines whether the voltage of the battery cell is less than the first voltage threshold and determines whether the temperature difference of the battery cell is greater than the temperature difference threshold. If the monitoring and early warning system determines that the voltage of the battery cell is less than the first voltage threshold and determines that the temperature difference of the battery cell is greater than the temperature difference threshold, the monitoring and early warning system performs the third early warning action; otherwise, the monitoring and early warning system does not perform the third early warning action.

[0015] Furthermore, the third warning action is that the monitoring warning system inputs the third warning information to the electronic control unit (ECU); the electronic control unit (ECU) inputs the third warning information to the remote communication terminal (T-Box) after receiving the second warning information; the remote communication terminal (T-Box) 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.

[0016] The present invention also provides a monitoring and early warning system for a power battery pack, including a battery management system (BMS), a current sensor, a main control chip, an electronic control unit (ECU), and a remote communication terminal (T-Box), wherein the input end of the main control chip is respectively connected to the output end of the battery management system (BMS) and the output end of the current sensor; the output end of the main control chip is connected to the input end of the electronic control unit (ECU); and the output end of the electronic control unit (ECU) is connected to the input end of the remote communication terminal (T-Box).

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

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

[0019] (2) The monitoring and early warning method and the monitoring and early warning system of the present invention can monitor whether the insulation value of the vehicle is abnormal and issue an early warning to remind the user in time.

[0020] (3) The monitoring and early warning method and monitoring and early warning system of the present invention can monitor the health of the power battery pack and issue an early warning to remind the user in time based on whether the health of the power battery pack is less than the health threshold.

[0021] (4) The monitoring and early warning method and the monitoring and early warning system of the present invention can monitor whether the battery cell is thermally runaway and issue an early warning to remind the user in time.

[0022] (5) Through the monitoring and early warning method and the monitoring and early warning system of the present invention, after monitoring and early warning of the power battery pack, safety accidents can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] This specification includes the following drawings, which show the following contents:

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

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

[0026] Figure 3 It is a flowchart of a power battery pack health monitoring and early warning method of the present invention;

[0027] Figure 4 It is a flowchart of a monitoring and early warning method for a power battery pack of the present invention;

[0028] Figure 5It is a logical structure block diagram of a monitoring and early warning system for a power battery pack of the present invention.

[0029] Explanation of the accompanying drawings: 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 implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0031] Figure 1 It is a logic block diagram of a monitoring and early warning method for a power battery pack of the present invention. The monitoring and early warning method for a power battery pack of the present invention includes vehicle insulation value monitoring and early warning, power battery pack health monitoring and early warning, and battery cell thermal runaway monitoring and early warning. Among them, 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 decrease rate; the power battery pack health monitoring and early warning is: power battery pack health early warning is performed by monitoring the battery cell voltage and the battery cell charge and discharge capacity; battery cell thermal runaway monitoring and early warning is: battery cell thermal runaway early warning is performed by monitoring the battery cell voltage and the battery cell temperature; that is, corresponding Figure 1 The content in.

[0032] Figure 2 The vehicle insulation value monitoring and early warning flow chart of the monitoring and early warning method of a power battery pack of the present invention is composed of Figure 2It can be seen that the vehicle insulation value monitoring and early warning is specifically as follows: 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 determines whether the vehicle insulation value is not less than the first insulation value threshold. If the monitoring and early warning system determines 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 determines that the vehicle insulation value is less than the first insulation value threshold, the monitoring and early warning system determines whether the vehicle insulation value is less than the second insulation value threshold. If the monitoring and early warning system determines 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 determines that the vehicle insulation value is not less than the second insulation value threshold, the monitoring and early warning system determines whether the vehicle insulation value decrease rate is greater than the insulation value decrease rate threshold. If the monitoring and early warning system determines 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 determines 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. Among them, the first warning action is that the monitoring warning system 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.

[0033] More specifically, the insulation value of the vehicle in the high-voltage circuit 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 into the main control chip 3. After receiving the vehicle insulation value data input by the insulation value detection module, the main control chip 3 will determine whether the vehicle insulation value is not less than the first insulation value threshold. If the main control chip 3 determines that the vehicle insulation value is not less than the first insulation value threshold, the main 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 warning to remind the user in time. If the main control chip 3 determines that the vehicle insulation value is less than the first insulation value threshold, the main control chip 3 will further determine whether the vehicle insulation value is less than the second insulation value threshold. If the main control chip 3 determines that the vehicle insulation value is less than the first insulation value threshold, the main control chip 3 will further determine whether the vehicle insulation value is less than the second insulation value threshold. If the vehicle insulation value is less than the second insulation value threshold, the main control chip 3 performs the first warning action, thereby realizing the function of monitoring whether the vehicle insulation value is abnormal and making a warning to remind the user in time. If the main control chip 3 determines that the vehicle insulation value is not less than the second insulation value threshold, the main control chip 3 will further determine whether the vehicle insulation value drop rate input by the battery management system (BMS) 1 is greater than the insulation value drop rate threshold. If the main control chip 3 determines 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 warning action. If the main control chip 3 determines that the vehicle insulation value drop rate is greater than the insulation value drop rate threshold, the main control chip 3 performs the first warning action, thereby realizing the function of monitoring whether the vehicle insulation value is abnormal and making a warning to remind the user in time. That is, it can realize monitoring and warning of the power battery pack to prevent safety accidents. Among them, the first warning action is that the main 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] Among them, the above-mentioned first warning information is that the vehicle insulation value is abnormal.

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

[0036] Figure 3 The flowchart of the power battery pack health monitoring and early warning method of the present invention is as follows: Figure 3It can be seen that the health monitoring and early warning of the power battery pack are specifically as follows: the monitoring and early warning system collects the charge and discharge capacity of the battery cells and the minimum voltage of the battery cells 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 cells, and the monitoring and early warning system calculates the second health of the power battery pack through the charge and discharge capacity of the battery cells. 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, and 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. Among them, the second warning action is that the monitoring warning system 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 automotive remote service provider (TSP) platform; the automotive remote service provider (TSP) platform sends the second warning information to the terminal device. In addition, the above-mentioned monitoring 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, which means that the monitoring warning system calculates the health of the power battery pack by calculating the arithmetic mean of the first health of the power battery pack and the second health of the power battery pack.

[0037] More specifically, the power battery pack must first 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 main control chip 3. The main control chip 3 screens out the lowest voltage of the battery cell from the voltage data of the battery cell it receives. The main control chip 3 queries the corresponding power battery pack capacity value through the battery cell OCV table according to the lowest voltage of the battery cell. 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 circuit, and calculates the cumulative charge and discharge capacity value of the battery cell by integrating the current over time, and inputs the calculated cumulative charge and discharge capacity value information of the battery cell into the main control chip 3. The main control chip 3 calculates the cumulative charge and discharge capacity of the battery cell by the cumulative charge and discharge capacity of the battery cell. The capacity value is divided by the cumulative rated charge and discharge capacity of the power battery pack to obtain the second health of the power battery pack, wherein the cumulative rated charge and discharge capacity of the power battery pack is equal to the rated capacity of the power battery pack multiplied by the number of charge and discharge cycles, and each charge and discharge completed by the power battery pack is recorded as the number of charge and discharge cycles; the main control chip 3 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, and the main control chip 3 determines whether the health of the power battery pack is less than the health threshold. If the main control chip 3 determines that the health of the power battery pack is less than the health threshold, the main control chip 3 performs the second warning action, thereby being able to monitor the health of the power battery pack and issue a warning to timely remind the user based on whether it is less than the health threshold. If the main control chip 3 determines that the health of the power battery pack is not less than the health threshold, the main control chip 3 does not perform the second warning action. That is, it is possible to monitor and warn the power battery pack to prevent safety accidents. Among them, the second warning action is that the main 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 automotive remote service provider (TSP) platform; the automotive remote service provider (TSP) platform sends the second warning information to the terminal device. In addition, the above-mentioned main control chip 3 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, which means that the main control chip 3 calculates the health of the power battery pack by calculating the arithmetic mean of the first health of the power battery pack and the second health of the power battery pack.

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

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

[0040] In addition, the above-mentioned preset condition is that the power battery pack is kept at rest for a longer period of time in a fully charged state than a preset time, wherein the preset time is 30 minutes.

[0041] Figure 4 It is a flowchart of a monitoring and early warning method for a power battery pack of the present invention, comprising Figure 4 It can be seen that the battery cell thermal runaway monitoring and early warning is specifically as follows: the monitoring and early warning system collects the voltage of the battery cell and the 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 early warning system determines whether the voltage of the battery cell is less than the first voltage threshold and whether the temperature of the battery cell is greater than the first temperature threshold. If the monitoring and early warning system determines that the voltage of the battery cell is less than the first voltage threshold and determines that the temperature of the battery cell is greater than the first temperature threshold, the monitoring and early warning system performs the third early warning action; otherwise, the monitoring and early warning system determines whether the voltage of the battery cell is less than the first voltage threshold and determines whether the temperature rise rate of the battery cell is greater than the temperature rise rate threshold. If the monitoring and early warning system determines that the voltage of the battery cell is less than the first voltage threshold and determines that the temperature rise rate of the battery cell is greater than the temperature rise rate threshold, the monitoring and early warning system performs the third early warning action; otherwise, the monitoring and early warning system determines whether the voltage of the battery cell is less than the first voltage threshold and determines whether the temperature difference of the battery cell is greater than the temperature difference threshold. If the monitoring and early warning system determines that the voltage of the battery cell is less than the first voltage threshold and determines that the temperature difference of the battery cell is greater than the temperature difference threshold, the monitoring and early warning system performs the third early warning action; otherwise, the monitoring and early warning system does not perform the third early warning action. Among them, the third warning action is that the monitoring 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 and temperature acquisition module in the battery management system (BMS) 1, and the collected voltage and temperature data of the battery cell are input into the main control chip 3. After receiving the voltage and temperature of the battery cell input by the voltage and temperature acquisition module, the main control chip 3 will determine whether the voltage of the battery cell is less than the first voltage threshold and whether the temperature of the battery cell is greater than the first temperature threshold. If the main control chip 3 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 main control chip 3 will perform a third early warning action, thereby being able to monitor whether the battery cell is thermally runaway and issue an early warning to remind the user in time. Otherwise, the main control chip 3 will further determine whether the voltage of the battery cell is less than the first voltage threshold and will further determine whether the battery cell is thermally runaway. Whether the temperature rise rate of the input cell is greater than the temperature rise rate threshold, if the main control chip 3 determines that the voltage of the cell is less than the first voltage threshold and the temperature rise rate of the cell is greater than the temperature rise rate threshold, the main control chip 3 performs the third warning action, thereby being able to monitor whether the cell is in thermal runaway and issue a warning to promptly remind the user, otherwise, the main control chip 3 will further determine whether the voltage of the cell is less than the first voltage threshold and further determine whether the temperature difference of the cell input by the battery management system (BMS) 1 is greater than the temperature difference threshold, if the main control chip 3 determines that the voltage of the cell is less than the first voltage threshold and the temperature difference of the cell is greater than the temperature difference threshold, the main control chip 3 performs the third warning action, thereby being able to monitor whether the cell is in thermal runaway and issue a warning to promptly remind the user, otherwise, the main control chip 3 does not perform the third warning action. That is, it is possible to monitor and warn the power battery pack to prevent safety accidents. Among them, the third warning action is that the main 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 mentioned above is thermal runaway of the battery cell.

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

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

[0046] In addition, in this specific implementation, the main control chip 3 can be a microcontroller (MCU); the terminal device can be a smart phone, a tablet or other terminal device.

[0047] Functions and Effects of the Embodiments

[0048] The insulation value of the vehicle in the high-voltage circuit 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 into the main control chip 3. After receiving the vehicle insulation value data input by the insulation value detection module, the main control chip 3 will determine whether the vehicle insulation value is not less than the first insulation value threshold. If the main control chip 3 determines that the vehicle insulation value is not less than the first insulation value threshold, the main 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 warning to remind the user in time. If the main control chip 3 determines that the vehicle insulation value is less than the first insulation value threshold, the main control chip 3 will further determine whether the vehicle insulation value is less than the second insulation value threshold. If the main control chip 3 determines that the vehicle insulation value is less than the first insulation value threshold, the main control chip 3 will further determine whether the vehicle insulation value is less than the second insulation value threshold. If the insulation value of the vehicle is less than the second insulation value threshold, the main control chip 3 performs the first warning action, thereby realizing the function of monitoring whether the insulation value of the vehicle is abnormal and making a warning to remind the user in time. If the main control chip 3 determines that the insulation value of the vehicle is not less than the second insulation value threshold, the main control chip 3 will further determine whether the vehicle insulation value drop rate input by the battery management system (BMS) 1 is greater than the insulation value drop rate threshold. If the main control chip 3 determines 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 warning action. If the main control chip 3 determines that the vehicle insulation value drop rate is greater than the insulation value drop rate threshold, the main control chip 3 performs the first warning action, thereby realizing the function of monitoring whether the insulation value of the vehicle is abnormal and making a warning to remind the user in time. That is, it can realize monitoring and warning of the power battery pack to prevent safety accidents.

[0049] First, the power battery pack must 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 main control chip 3. The main control chip 3 selects the lowest voltage of the battery cell from the voltage data of the battery cell it receives. The main control chip 3 queries the corresponding power battery pack capacity value through the battery cell OCV table according to the lowest voltage of the battery cell. 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 circuit, and calculates the cumulative charge and discharge capacity value of the battery cell by integrating the current over time, and inputs the calculated cumulative charge and discharge capacity value information of the battery cell into the main control chip 3. The main control chip 3 calculates the cumulative charge and discharge capacity of the battery cell by the cumulative charge and discharge capacity of the battery cell. The value is divided by the cumulative rated charge and discharge capacity of the power battery pack to obtain the second health of the power battery pack, wherein the cumulative rated charge and discharge capacity of the power battery pack is equal to the rated capacity of the power battery pack multiplied by the number of charge and discharge cycles, and each charge and discharge completed by the power battery pack is recorded as a number of charge and discharge cycles; the main control chip 3 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, and the main control chip 3 determines whether the health of the power battery pack is less than the health threshold. If the main control chip 3 determines that the health of the power battery pack is less than the health threshold, the main control chip 3 performs the second warning action, thereby being able to monitor the health of the power battery pack and issue a warning to timely remind the user based on whether it is less than the health threshold. If the main control chip 3 determines that the health of the power battery pack is not less than the health threshold, the main control chip 3 does not perform the second warning action. That is, it is possible to monitor and warn the power battery pack to prevent safety accidents.

[0050] The voltage and temperature of the battery cell are collected by the voltage and temperature acquisition module in the battery management system (BMS) 1, and the collected voltage and temperature data of the battery cell are input into the main control chip 3. After receiving the voltage and temperature of the battery cell input by the voltage and temperature acquisition module, the main control chip 3 will determine whether the voltage of the battery cell is less than the first voltage threshold and whether the temperature of the battery cell is greater than the first temperature threshold. If the main control chip 3 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 main control chip 3 will perform a third early warning action, thereby being able to monitor whether the battery cell is thermally runaway and issue an early warning to remind the user in time. Otherwise, the main control chip 3 will further determine whether the voltage of the battery cell is less than the first voltage threshold and will further determine whether the temperature of the battery cell input by the battery management system (BMS) 1 is greater than the first temperature threshold. Whether the temperature rise rate is greater than the temperature rise rate threshold. If the main control chip 3 determines that the voltage of the battery cell is less than the first voltage threshold and that the temperature rise rate of the battery cell is greater than the temperature rise rate threshold, the main control chip 3 performs the third early warning action, thereby being able to monitor whether the battery cell is thermally out of control and make an early warning to promptly 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 and will further determine whether the temperature difference of the battery cell input by the battery management system (BMS) 1 is greater than the temperature difference threshold. If the main control chip 3 determines that the voltage of the battery cell is less than the first voltage threshold and that the temperature difference of the battery cell is greater than the temperature difference threshold, the main control chip 3 performs the third early warning action, thereby being able to monitor whether the battery cell is thermally out of control and make an early warning to promptly remind the user. Otherwise, the main control chip 3 will not perform the third early warning action to prevent safety accidents.

[0051] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above-mentioned concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A monitoring and early warning method for a power battery pack, characterized in that: 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: early warning of the vehicle insulation value 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: early warning of the health 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 the battery cell temperature.

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

3. A monitoring and early warning method for a power battery pack as claimed in claim 2, characterized in that: The first warning action is to monitor the warning system and input the first warning information to the electronic control unit (ECU); the electronic control unit (ECU) inputs the first warning information to the remote communication terminal (T-Box) after receiving the first warning information; the remote communication terminal (T-Box) 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.

4. A monitoring and early warning method for a power battery pack according to claim 1, characterized in that: The health monitoring and early warning of the power battery pack is specifically that 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 a first health of the power battery pack through the minimum voltage of the battery cells, and calculates a second health of the power battery pack through the charge and discharge capacity of the battery cells. 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 a 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 a 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. A monitoring and early warning method for a power battery pack as claimed in claim 4, characterized in that: The second warning action is to monitor the warning system and input the second warning information to the electronic control unit (ECU); the electronic control unit (ECU) inputs the second warning information to the remote communication terminal (T-Box) after receiving the second warning information; the remote communication terminal (T-Box) 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.

6. A monitoring and early warning method for a power battery pack as claimed in claim 4, characterized in that: The preset condition is that the power battery pack is kept at rest for a longer period of time in a fully charged state.

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

8. The monitoring and early warning method for a power battery pack according to claim 1, characterized in that: The battery cell thermal runaway monitoring and early warning is specifically as follows: the monitoring and early warning system collects the voltage of the battery cell and the 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 early 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 early 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 early warning system performs a third early warning action; otherwise, the monitoring and early 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 early 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 early warning system performs the third early warning action; otherwise, the monitoring and early 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 early 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 early warning system performs the third early warning action; otherwise, the monitoring and early warning system does not perform the third early warning action.

9. A monitoring and early warning method for a power battery pack according to claim 8, characterized in that: The third warning action is that the monitoring warning system inputs the third warning information to the electronic control unit (ECU); the electronic control unit (ECU) inputs the third warning information to the remote communication terminal (T-Box) after receiving the second warning information; the remote communication terminal (T-Box) 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.

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

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