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Electric Vehicle Battery Load Testing Feature and Application

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The demand for quality load cell sensors and testing technology solutions in the electric vehicle market is high. This extends into the innovations and testing related to electric vehicle batteries. Design engineers and automotive manufacturers are looking for ways to extend the life of the EV battery, while also seeking ways to maximize overall vehicle performance.

Interface application engineers have been working to provide standard and custom solutions to EV battery manufacturers and testing labs for R&D, prototyping, and performance monitoring. It has sparked recent publications to reach out to Interface to discuss the types of force measurement devices that are being used, along with supportive instrumentation for various tests related to the electric vehicle market.

We’ve captured one of these use cases in the new application note, Electric Vehicle Structural Battery Testing.

The initial requirements for this application were to validate structural battery pack design, both in terms of life expectancy against design targets as well as crash test compliance and survivability.  Interface recommended utilizing 1100 Ultra-Precision LowProfile Load Cells in-line with hydraulic or electromechanical actuators within a structural test stand. The 6-Axis Load Cells were used to capture reactive forces transmitting through pack structure. These multi-axis sensors provide more measurement data and brings greater system level insight and improved product success. Using this configuration, the tests performed using Interface’s force measurement products validated the battery packs strong structural design. Read more here.

Recently we shared our experience in working with companies to provide load cells for testing batteries.  The details of this interview with DesignNews are highlighted in a brief excerpt below. Read the entire article here.

BATTERY LOAD TESTING PRESENTS NEW OPPORTUNITIES FOR INTERFACE

By Dan Carney at DesignNews

The Arizona force management specialist is finding new opportunities for its load cells testing batteries.  In addition to measuring the strength of the battery case, it is also important for automakers to measure the pressure of the cells inside the case. In both situations, force management solutions from Interface, Inc. (Scottsdale, Arizona) are beneficial.

“FEA and computerized modeling get the customer most of the way there,” observed Interface vice president of global sales Brian Peters in a phone interview with Design News. “Automotive OEMs are spending more time on various structural development testing,” he said. “They are push-pull, multi-axis similar to what we see with aerospace fuselage testing.”

This is important because, in addition to the torsional loads normally applied to the battery box in the course of normal driving, there is also the need to model for worst-case crash scenarios.

“You have basic (noise, vibration, and harshness) torsional rigidity requirements, but then you have the crash requirements,” Peters noted. “How do you model, test, and have successful test results? When you run the full system into the barrier, sometimes the outcome is hard to model.”

ADDITIONAL RESOURCES

Feature Article Highlights Interface Solutions for EV Battery Testing

EV Battery Testing Solutions Utilize Interface Mini Load Cells

Electric Vehicle Battery Monitoring

Interface Helps to Power the Electric Vehicle Market Forward

Test and Measurement for Electric Vehicles

Torque Measurement for Electric Vehicles App Note

The Future of Automotive is Electric

The Role of Actuators in Force Measurement

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One of the most common force measurement tests in the engineering and manufacturing world is called cycle testing. Cycle testing involves constant force being applied to a component or product over hours, days and even months. The goal is to test a product to find out how long it will last under the amount of force it will see in use in the real world.

Cycle testing is used throughout different industries. One of the most common applications of a cycle test is on something like airplane wings. The wings of an airplane are exposed to constant push and pull force to guarantee that they will hold up over many flights. Check out the wing fatigue testing application note here.

Another example is simple furniture tests, like a chair, to ensure it can withstand the weight of people of all sizes after years and years of use. These tests are designed to really push the limits on the product so engineers and manufacturers can confirm their designs and ensure safety and durability.

To carry out these tests, actuators are used to generate the force in cycle testing. An actuator is a component responsible for moving and controlling a mechanism or system. Actuators are small components that convert energy in a linear moment. There are a variety of different types of actuators including linear, rotary, hydraulic, pneumatic, and more. Each is designed to create force in different directions and on different axes.

Actuators are very important because force measurement is fed back into a control loop and the actuator allows you to accurately control how much force you’re putting on a test article. As a basic example, if you wanted to measure how much force it takes to close a door, you would use an actuator to provide the door closing force while the load cell measures the amount of force given off by the actuator.

Interface often integrates actuators into load cells for custom solutions to use in rigorous use and cycle testing. These types of custom solutions are used by equipment and product manufacturers, OEMs, as well as product design and testing labs. There is increasing frequency for OEMs to integrate actuators into load cells for testing their automated testing lines or products in use for continuous feedback.

For example, mobile device manufacturers use a miniature–sized load button load cell like the ConvexBT to test the pressure sensitivity of the touch screen. By using an actuator, phone manufacturers can set up an automated test lines with an actuator integrated in the load button load cell to test each screen as they go across a test line. You can read more about ConvexBT in this new white paper.

Another major application for actuators is in calibration machines. To test if a load cell is calibrated correctly, an actuator applies force to the load cell being tested and a calibration grade Gold Standard Load Cell simultaneously. These measurements can tell the user if the load cell needs to be recalibrated or not because the actuator allows the user to create a very precise force measurement. If measurements on the test load cell are not the same as the control load cell, the user knows it is off calibration and it’s time to schedule a calibration service.

From custom solutions to calibration, if actuators are necessary for your next project learn how Interface can work with you to find a solution that meets your precise needs.

Read more about Gold Standard Calibration Systems here.

Learn about how Interface is a preferred provider of OEM solutions here.