How to Test Large Prismatic Lithium Cells Automatically?

Testing large prismatic lithium cells automatically is a critical step for achievinga high level of efficiency, performance and safety of the lithium-ion batteries that are being used in many industries and applications including electric vehicles (EVs), energy storage systems and renewable energy. Prismatic cells have a rectangular shape and allow for a high energy density to be packed into them. They require specific Automate equipment to test the special capabilities. In this article we will look at the testing of the large prismatic cell and the automatic equipment available for testing.
Why test the prismatic lithium cell? Lithium cells are used because they have a number of advantages over older technologies that make them ideal for large applications, the biggest of these being their compactness, and their abilities to give off a higher energy when needed. To make sure all of this is achieved, testing then becomes essential for a number of reasons:
Safety: Lithium cells could all explode if overcharged for long enough and if the temperature conditions were right to do so. Safety testing looks to see that the cells are designed correctly to avoid a thermal runaway situation, to ensure that this doesn’t happen.
Capacity: Testing facilitates that the prismatic cell may have the actual voltages or current that it does at the present time in the design. Such a situation exists say with electric vehicles for example where not just battery life but battery voltage in a proper vehicle comes into account, making this a vital consideration.
Quality control: Faulty types may appear on the production line, or those with certain inconsistencies in them, quenched by testing equipment. This could prevent a cell from being used in important applications.
Cycle life: Lithium cells will be charged and discharged many times in their life.Testing reveals how long the prismatic cell will last.
Cell Tests for Prismatic Lithium Cells
Tests on prismatic lithium cells typically include the following:Capacity test—ensures that the energy storage capacity of the cell meets the manufacturers’ specification. This test consists of charging the prismatic cell to full capacity and discharging it to measure its total energy supplied to an electrical load.
Voltage test—verifies that cell operating voltages are within specified tolerances. Out of tolerance voltage cells bring with no hope for recovery.
Internal Resistance test—quantifies the internal resistance of the cell. As internal resistance rises, heating increases and efficiency drops.
Temperature test—verifies that lithium cell performance is satisfactory at specified high and low temperatures.
Cycle Life test—how does the prismatic cell perform for many discharge-charge cycles?How to Test Large Prismatic Cells Automatically
The prismatic cells of considerable size can be tested only by automatic methods, with machines of great power and capacity. In some instances the cells are charged and discharged, as in other batteries, and the usual operations of measuring the voltage and capacity are performed automatically. In other cases the machines used for sorting the cells at the factory are adapted to this purpose, and all the tests are combined with those of an ordinary sorting machine. In either case the work is performed much more rapidly and with greater accuracy by the automatic tester than by any human agency. Such use of the sorting apparatus enables it to take higher grades of cells only; and this operation may be termed a mechanical inspection of the batteries.
In other cases testing machines accompany the sorters of the cells, and both operations are performed. In this way it is possible to determine in the shortest time the importance of a cell, whether to reject and destroy it, or utilize it in the final cellular assembly. The latest uses of automatic procedures make it possible to profit by every more minute dose of data regarding the cells, which enables to control the real quality of the prismatic battery.
Heavier prismatic cells may similarly be connected to machines by heavy clamps, directly from the couch, taking part in the automatic tests, thus eliminating the necessity of any previous treatment of the cell. If the extraordinary burden placed upon this regime were reduced, its operations might be infinitely multiplied. The last word in the rapid inspections of prismatic cells is the gathering of larger quantities of information pertaining to their characteristics. Typically it is an ordering and sorting machine of immense power and capacity.
Flawless automatic machines will relieve the human hand of all testing operations as crudely defined in terms of the cell and contact regulation. Prints of cells sent out from detective battery plants sometimes will announce their approach at falsely emphasized greatness, and the future is evident. Automatically done for the human hand, each cell will be tested repeatedly and thoroughly as it is forming itself, interacting and joining to each pursuit within its greattes dear to sea sacrificed. Resists latest applications made its way to the standard of disclosures unique of prismatic parts to tell.
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