As a key component and technology of electric vehicle, the performance of power battery is closely related to battery consistency control, battery monitoring and management and vehicle matching technology. Among them, the thermal management of battery is of great significance for the reliable and safe operation of electric vehicle.

Infrared temperature measurement technology uses infrared detection technology to obtain the thermal information of the infrared radiation state of the equipment, and then convert it into temperature for display. As a new non-contact measurement technology, it has a good application prospect in the thermal management system of power batteries.

Solutions and advantages

Customer needs:

When the battery box leaves the factory, it needs to carry out charge and discharge detection, and screen out the faulty products according to the abnormal temperature.

Generally, when the battery temperature reaches about 70 ℃ ~ 80 ℃, it may fail. When the temperature exceeds 55 ℃, it will give an alarm.

Solution:

Option 1: Installation in progress

This scheme has strong enforceability. Shelf products do not need to be customized, but there are a large number of infrared thermal imagers to be installed and the cost is high.

Option 2: Oblique installation

This scheme is economical, but there are requirements for installation conditions. Due to the angle relationship, each infrared thermal imager has the problem of temperature measurement consistency, which needs to be corrected. Our company recommends the customer to correct it by himself.

Option 3: Slide rail installation

Slide rails are laid on both sides of the tooling rack, and the thermal imager moves along the slide rails to measure the temperature of each battery pack respectively. There is at least one infrared thermal imager on each side of the slide rails. This scheme requires about 10s to complete all temperature data acquisition.

Advantage

Monitor the battery in real time around the clock, and you can directly "see" the temperature changes

Any local temperature in the coverage area of a single product can be obtained by measuring any point on the infrared heat map

Comprehensive analysis can be carried out according to the points taken at different positions, and the judgment basis is more sufficient

Over temperature alarm to prevent battery overheating and spontaneous combustion

Applicable Machine

The application of infrared in automobile industry mainly includes the following points

1.Engine fault diagnosis:

Generally speaking, the engine must undergo vibration and noise tests to evaluate the overall structure. However, for some minor defects of the engine (such as minor cracks, subtle structural design differences, etc.), it is difficult to accurately diagnose them through the first two methods. Infrared thermal imaging technology can reflect subtle structural defects as subtle temperature differences, so as to achieve the diagnostic effect that cannot be achieved by other methods. The above figure is the thermal map of the engine inside the car, so we can have a clear view of the temperature distribution inside the car. The temperature of each component position can accurately reflect the performance of the engine in actual work.

2.Brake system fault diagnosis:

The braking diagnosis of the vehicle depends on many factors. According to the weight distribution, vehicle size, vehicle height and other conditions, the front braking system should bear a large proportion of the braking effect. Using infrared thermal imager to compare the temperature of the front and rear wheels of the vehicle, this method is simple and feasible. Generally speaking, the temperature of the front wheel should be higher than that of the rear wheel. If the temperature of the two front wheels (or rear wheels) is also different, it can be judged that there is a blocked oil path in the braking system, which may be due to air. The above figure shows the actual temperature distribution of the front wheel.

3.Body air tightness test:

The quality of the air-conditioning system of the car is very important to the use of the car, and the overall air tightness of the car body will directly affect the efficiency of the air-conditioning system. During the vehicle test, turn on the air conditioning system in the vehicle (operate for a period of time), and then use the infrared thermal imager to capture the heat map of the whole vehicle. If air leakage occurs at car doors, glass joints, etc., you can see that the temperature here is different from the external ambient temperature. Thus, the overall air tightness of the vehicle body can be accurately analyzed and evaluated.

4.Inspection of window heating wire:

The heating wire is located in the rear glass of the car, and its normal operation will directly affect the safe driving of the car in foggy conditions. Using infrared thermal imager can make a comprehensive and rapid diagnosis of the distribution of the whole heating wire.

5.Inspection of automobile exhaust pipe:

The high temperature of the exhaust pipe can reflect the insufficient combustion, so it can indirectly evaluate the working condition of the engine system. If the temperature distribution of the pipeline is uneven, it can reflect that the pipeline itself has structural defects. In addition, thermal imagers can be used to detect and diagnose the bearing system, electrical equipment and body comfort of the automobile chassis.

6.Seat heating fault diagnosis:

Like the detection of window heating wire, the use of infrared thermal imager can make a comprehensive and rapid detection of the seat heating system to determine whether there is a problem in the system and accurately locate the fault point.

       7.Stamping process inspection

According to statistics, 60% - 70% of the parts on the car are produced by stamping process. This is a very important step in automobile manufacturing. Therefore, stamping technology has an important impact on the product quality, production efficiency and production cost of automobiles.

Stamping central control panel

Applicable Machine

K23E19 online infrared thermal imaging thermometer adopts 17 μm uncooled infrared focal plane detector, high-performance infrared lens and signal processing circuit, and embedded image processing algorithm, with small size, low power consumption, fast start-up, excellent imaging quality, accurate temperature measurement and other characteristics.

The device selection of k23e19 on-line infrared thermal imaging thermometer fully considers the requirements of high and low temperature working performance to ensure that the whole machine has excellent environmental adaptability.

Functional Characteristics

1. It has all-weather passive thermal imaging function, has strong smoke penetration performance, and can be used in a wide range of ambient temperatures;
2. With high frame rate design, fast-moving targets can be observed;
3. Adopt self-developed temperature measurement correction algorithm to realize accurate temperature measurement;
4. Output full stream lossless 16bit temperature data, and provide client software and SDK development kit.

Application Field

Power Grid, Petroleum And Petrochemical, Rail Transit, Circuit Detection

Scientific Research, Security Monitoring, Machine Vision, Customized Development