阅读说明：本技术 一种车载电池组过热检测与防控系统 (Overheat detection and prevention and control system for vehicle-mounted battery pack ) 是由 李其仲 柳子晗 杨梅君 章嵩 杨福宝 涂溶 黄妙华 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种车载电池组过热检测与防控管理系统,包括温度传感器,车辆ECU,信息存储器,充电模块,通信模块。该系统通过温度传感器检测电池温度或温升速率状态,将数据传输至车辆ECU,车辆ECU根据数据判断电池温度是否异常,若出现异常情况,则控制充电模块停止充电,并通过通信模块将过热警报发送至用户及车辆安全监控中心。(The invention discloses a vehicle-mounted battery pack overheat detection, prevention and control management system which comprises a temperature sensor, a vehicle ECU (electronic control unit), an information memory, a charging module and a communication module. The system detects the temperature or temperature rise rate state of the battery through the temperature sensor, transmits data to the vehicle ECU, judges whether the temperature of the battery is abnormal or not according to the data, controls the charging module to stop charging if the temperature of the battery is abnormal, and sends an overheat alarm to a user and a vehicle safety monitoring center through the communication module.)

1. The utility model provides an overheated detection of on-vehicle group battery and prevention and control system which characterized in that: the system comprises:

a temperature sensor for detecting a vehicle-mounted battery temperature;

the vehicle ECU is used for calculating the temperature rise rate according to the detected temperature of the vehicle-mounted battery and judging the temperature state of the battery; specifically, the temperature of the vehicle-mounted battery is judged to be abnormal by comparing the temperature of the vehicle-mounted battery with a threshold value, an average temperature rise abnormal coefficient is introduced, and the average temperature rise rate of the vehicle-mounted battery is judged to be abnormal;

an information storage for storing vehicle ECU calculation results;

the charging module is connected with a charger switch and used for controlling the charger switch to stop charging when the vehicle ECU gives an abnormal alarm;

and the communication module is used for sending a battery temperature abnormity alarm to a user and a vehicle safety monitoring center.

2. The vehicle-mounted battery pack overheat detection and prevention and control system according to claim 1, characterized in that: the comparison between the temperature of the vehicle-mounted battery and the threshold value is as follows: the vehicle ECU is provided with temperature thresholds N1, N2;

when the battery temperature N is lower than N1, judging that the temperature of the battery in the charging process is normal; when the battery temperature N is N1-N2, triggering secondary early warning; and when the battery temperature N is greater than N2, triggering a three-stage early warning.

3. The vehicle-mounted battery pack overheat detection and prevention and control system according to claim 1, characterized in that: the average temperature rise introduction abnormal coefficient is specifically as follows: the vehicle ECU is provided with an average temperature rise abnormal coefficient A according to an average temperature rise speed threshold value M of the battery, and the definition of the average temperature rise speed of the battery is as follows: the ratio of the temperature rise to the residual capacity of the battery; when all the average temperature rise abnormal coefficients A in a certain period of time are not larger than a, judging that the temperature of the battery is normal in the charging process; triggering a secondary early warning when the average temperature rise abnormal coefficient A is kept between a and b within a certain period of time; and triggering an abnormal alarm when all the average temperature rise abnormal coefficients A are greater than b within a certain period of time.

4. The vehicle-mounted battery pack overheat detection and prevention and control system according to claim 1, characterized in that: the system is provided with a cooling fan for dissipating heat from the battery being charged.

5. The vehicle-mounted battery pack overheat detection and prevention and control system according to claim 1, characterized in that: the system is provided with the compression pump, and when the vehicle ECU sends out secondary early warning, the compression pump is started to enhance the heat dissipation of the battery.

6. The vehicle-mounted battery pack overheat detection and prevention and control system according to claim 1, characterized in that: and the charging module controls the charger switch to stop charging when receiving a three-level alarm or an abnormal alarm sent by the vehicle ECU.

7. The vehicle-mounted battery pack overheat detection and prevention and control system according to claim 1, characterized in that: and when receiving a three-level alarm or an abnormal alarm sent by the vehicle ECU, the communication module sends an alarm to a user and a vehicle safety monitoring center.

8. The vehicle-mounted battery overheating detection and prevention and control method implemented by the vehicle-mounted battery pack overheating detection and prevention and control management system according to any one of claims 1 to 7 is characterized in that: the method comprises the following steps:

step 1, collecting the temperature of a vehicle-mounted battery through a temperature sensor;

step 2, transmitting the acquired data to a vehicle ECU (electronic control Unit), judging whether the temperature state of the battery is normal or not by the vehicle ECU, and storing the result into an information memory;

step 3, when the vehicle ECU sends out a secondary alarm, the air speed of the cooling fan is increased and the compression pump is started;

and 4, when the vehicle ECU gives an abnormal alarm, controlling the charger switch to stop charging, and sending an abnormal temperature alarm to a user and a vehicle safety monitoring center.

9. The vehicle-mounted battery overheating prevention and control method according to claim 8, characterized in that: step 2 the principle of judging the battery temperature state by the vehicle ECU is as follows: the vehicle ECU is provided with temperature thresholds N1, N2; when the battery temperature N is lower than N1, judging that the temperature of the battery in the charging process is normal; when the battery temperature N is N1-N2, triggering secondary early warning; when the battery temperature N is greater than N2, triggering a three-stage early warning; the vehicle ECU calculates the temperature rise rate and sets an average temperature rise abnormal coefficient A according to an average temperature rise rate threshold value M of the battery, and the average temperature rise rate of the battery is defined as: the ratio of the temperature rise to the residual capacity of the battery; when all the average temperature rise abnormal coefficients A in a certain period of time are not more than 2, judging that the temperature of the battery is normal in the charging process; triggering a secondary early warning when the average temperature rise abnormal coefficient A is kept between a and b within a certain period of time; and triggering an abnormal alarm when all the average temperature rise abnormal coefficients A are greater than b within a certain period of time.

Technical Field

The invention relates to the technical field of batteries, in particular to a thermal management system for overheat detection and prevention and control of a vehicle-mounted battery pack.

Background

Nowadays, new energy automobiles gradually replace traditional fuel vehicles, but battery faults frequently occur, so that personal and property safety of drivers is threatened, and particularly spontaneous combustion is easily caused by overheating of batteries in the charging process.

Disclosure of Invention

The invention aims to provide an overheat detection and prevention and control system for a vehicle-mounted battery pack, which improves the safety of a charging process by monitoring the temperature of a battery.

In order to solve the technical problem, the invention provides a technical scheme that: the system comprises:

the temperature sensor is used for detecting the temperature and the temperature rise rate of the battery;

the vehicle ECU is used for calculating the temperature rise rate according to the detected temperature of the vehicle-mounted battery and judging the temperature state of the battery; specifically, the temperature of the vehicle-mounted battery is judged to be abnormal by comparing the temperature of the vehicle-mounted battery with a threshold value, an average temperature rise abnormal coefficient is introduced, and the average temperature rise rate of the vehicle-mounted battery is judged to be abnormal;

an information storage for storing vehicle ECU calculation results;

the charging module is connected with a charger switch and used for judging the abnormal temperature of the battery when the vehicle ECU judges that the battery is abnormal,

controlling a charger switch to stop charging;

and the communication module is used for sending a battery temperature abnormity alarm to a user and a vehicle safety monitoring center.

According to the scheme, the comparison between the temperature of the vehicle-mounted battery and the threshold value is as follows: the vehicle ECU is provided with a temperature threshold N₁、N₂(ii) a When the battery temperature N is lower than N₁Judging that the temperature of the battery is normal in the charging process; when the battery temperature N is N₁～N₂Triggering a secondary early warning; when the battery temperature N is more than N₂And triggering three-level early warning.

According to the scheme, the average temperature rise introduction abnormal coefficient is specifically as follows: the vehicle ECU is provided with an average temperature rise abnormal coefficient A according to an average temperature rise speed threshold value M of the battery, and the definition of the average temperature rise speed of the battery is as follows: the ratio of the temperature rise to the residual capacity of the battery; when all the average temperature rise abnormal coefficients A in a certain period of time are not larger than a, judging that the temperature of the battery is normal in the charging process; triggering a secondary early warning when the average temperature rise abnormal coefficient A is kept between a and b within a certain period of time; and triggering an abnormal alarm when all the average temperature rise abnormal coefficients A are greater than b within a certain period of time.

According to the scheme, the system is provided with the cooling fan for dissipating heat of the battery being charged.

According to the scheme, the system is provided with the compression pump, when the vehicle ECU sends out secondary early warning, the compression pump is started, and the heat dissipation of the battery is enhanced.

According to the scheme, the charging module controls the charger switch to stop charging when receiving a three-level alarm or an abnormal alarm sent by the vehicle ECU.

According to the scheme, when the communication module receives a three-level alarm or an abnormal alarm sent by the vehicle ECU, the communication module sends an alarm to a user and a vehicle safety monitoring center.

The overheating prevention and control method for the vehicle-mounted battery comprises the following steps:

step 1, collecting the temperature of a vehicle-mounted battery through a temperature sensor;

step 2, transmitting the acquired data to a vehicle ECU (electronic control Unit), judging whether the temperature state of the battery is normal or not by the vehicle ECU, and storing the result into an information memory;

step 3, when the vehicle ECU sends out a secondary alarm, the air speed of the cooling fan is increased and the compression pump is started;

and 4, when the vehicle ECU gives an abnormal alarm, controlling the charger switch to stop charging, and sending an abnormal temperature alarm to a user and a vehicle safety monitoring center.

Step 2 the principle of judging the battery temperature state by the vehicle ECU is as follows: the vehicle ECU is provided with a temperature threshold N₁、N₂(ii) a When the battery temperature N is lower than N₁Judging that the temperature of the battery is normal in the charging process; when the battery temperature N is N₁～N₂Triggering a secondary early warning; when the battery temperature N is more than N₂Triggering a three-stage early warning; the vehicle ECU calculates the temperature rise rate and sets an average temperature rise abnormal coefficient A according to an average temperature rise rate threshold value M of the battery, and the average temperature rise rate of the battery is defined as: the ratio of the temperature rise to the residual capacity of the battery; when all the average temperature rise abnormal coefficients A in a certain period of time are not more than 2, judging that the temperature of the battery is normal in the charging process; triggering a secondary early warning when the average temperature rise abnormal coefficient A is kept between a and b within a certain period of time; and triggering an abnormal alarm when all the average temperature rise abnormal coefficients A are greater than b within a certain period of time.

The invention has the beneficial effects that: by detecting the temperature state of the vehicle-mounted battery, the temperature of the battery can be timely reduced and the charging can be stopped when the battery has abnormal temperature rise, so that the risk of spontaneous combustion explosion and other phenomena of the vehicle-mounted battery in the charging process is reduced.

Drawings

FIG. 1 is a schematic diagram of a system;

FIG. 2 is a schematic diagram of a real-time evaluation level of a temperature rise state of a battery;

fig. 3 is a schematic diagram of the early warning and prevention and control strategy.

In the figure: 1-temperature sensor, 2-vehicle ECU, 3-information sensor, 4-charging module, and 5-communication module.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Referring to fig. 1, a vehicle-mounted battery pack overheat detection, prevention and control system includes a temperature sensor 1 for detecting a battery temperature and a temperature rise rate; the vehicle ECU2 is used for calculating the temperature rise rate according to the detected temperature of the vehicle-mounted battery and judging the temperature state of the battery; specifically, the temperature of the vehicle-mounted battery is judged to be abnormal by comparing the temperature of the vehicle-mounted battery with a threshold value, an average temperature rise abnormal coefficient is introduced, and the average temperature rise rate of the vehicle-mounted battery is judged to be abnormal; an information storage 3 for storing the calculation results of the vehicle ECU 2; the charging module 4 is connected with a charger switch and used for controlling the charger switch to stop charging when the vehicle ECU2 gives an abnormal alarm; and the communication module 5 is used for sending a battery temperature abnormity alarm to a user and a vehicle safety monitoring center.

Preferably, the comparing of the vehicle-mounted battery temperature and the threshold specifically comprises: the vehicle ECU2 is provided with temperature thresholds of 50 ℃, 70 ℃; when the temperature N of the battery is lower than 50 ℃, judging that the temperature of the battery is normal in the charging process; triggering a secondary early warning when the temperature N of the battery is 50-70 ℃; and when the temperature N of the battery is more than 70 ℃, triggering a third-level early warning.

Preferably, referring to fig. 2, the abnormal coefficient of the introduced average temperature rise specifically is: the vehicle ECU2 is provided with an average temperature rise abnormality coefficient a according to a battery average temperature rise rate threshold value of 0.375, which is defined as: the ratio of the temperature rise to the residual capacity of the battery; when all the average temperature rise abnormal coefficients A in a certain period of time are not more than 2, judging that the temperature of the battery is normal in the charging process; triggering a secondary early warning when the average temperature rise abnormal coefficient A is kept to be 2-4 within a certain period of time; and triggering an abnormal alarm when all the average temperature rise abnormal coefficients A are larger than 4 within a certain period of time.

Preferably, the system is provided with a cooling fan for dissipating heat from the battery being charged.

Preferably, the system is provided with a compression pump which is activated to enhance heat dissipation from the battery when the vehicle ECU2 issues a secondary warning.

Preferably, the charging module 4 controls the charger switch to stop charging when receiving a three-level alarm or an abnormal alarm from the vehicle ECU 2.

Preferably, the communication module 5 sends an alarm to the user and the vehicle security monitoring center when receiving a three-level alarm or an abnormal alarm from the vehicle ECU 2.

Referring to fig. 3, the method for preventing and controlling overheating of the vehicle-mounted battery comprises the following steps:

step 1, collecting the temperature of a vehicle-mounted battery through a temperature sensor 1;

step 2, transmitting the acquired data to the vehicle ECU2, judging whether the battery temperature state is normal by the vehicle ECU2, and storing the result in the information memory 3;

step 3, when the vehicle ECU2 sends out a secondary alarm, the air speed of the cooling fan is increased and the compression pump is started;

and step 4, when the vehicle ECU2 sends out an abnormal alarm, controlling the charger switch to stop charging, and sending a temperature abnormal alarm to a user and a vehicle safety monitoring center.

Step 2 the principle of the vehicle ECU2 determining the battery temperature state is specifically: the vehicle ECU is provided with temperature thresholds of 50 ℃ and 70 ℃; when the temperature N of the battery is lower than 50 ℃, judging that the temperature of the battery is normal in the charging process; triggering a secondary early warning when the temperature N of the battery is 50-70 ℃; when the temperature N of the battery is more than 70 ℃, triggering a third-level early warning; the vehicle ECU2 calculates the temperature rise rate and sets an average temperature rise abnormality coefficient a according to a battery average temperature rise rate threshold value of 0.375, the definition of the battery average temperature rise rate being: the ratio of the temperature rise to the residual capacity of the battery; when all the average temperature rise abnormal coefficients A in a certain period of time are not more than 2, judging that the temperature of the battery is normal in the charging process; triggering a secondary early warning when the average temperature rise abnormal coefficient A is kept to be 2-4 within a certain period of time; and triggering an abnormal alarm when all the average temperature rise abnormal coefficients A are larger than 4 within a certain period of time.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.