Lithium-ion battery cells incoming inspection solution and equipment requirements

Cylindrical battery cells such as 18650, 21700, 26650 and 32650, due to the flexible combination of parallel and series, are widely used in the production of lithium-ion battery packs of various voltages, capacities and sizes.

Due to the low capacity of a single battery cell, the number of battery cells required for the entire lithium-ion battery pack is sometimes very large. For example, the power battery pack of Tesla EV requires 7000~8000PCS 18650 battery cells to be reliably connected into modules.

However, with such a large number of battery cells, there is a higher requirement for the consistency of the battery cells. For lithium-ion battery packs with a large number of series and parallel, the inconsistency of battery cells will not only affect the performance of the battery pack, but even bring some safety hazards.

In addition, even the same batch of lithium-ion battery cells from the same manufacturer still has certain differences in performance, such as capacity, voltage, internal resistance, and decay speed.

Therefore, before assembling the battery pack, we need to test and sort the battery cells to improve the consistency of the cells as much as possible to ensure that the performance and cycle life of the battery pack produced can meet the design requirements.

As a professional lithium-ion battery pack assembly equipment and battery testing equipment supplier, Xiamen WinAck Battery can provide mature lithium-ion battery incoming inspection solutions.

Lithium-ion battery cell incoming inspection equipment

1. Cylindrical Battery cell sorting machine

The cylindrical battery cell sorting machine is equipped with a high-precision battery tester, which can quickly test the internal resistance and open circuit voltage of the cylindrical battery cells.

Not only that, except need to manual loading and manual reception, the battery sorter can automatically grade the incoming cylindrical battery cells according to the set open-circuit voltage value range and internal resistance range and transport them to the set channels.

In addition, the automatic sorting machine for cylindrical battery cells can also be equipped with a code scanning function to record and save the open circuit voltage value and internal resistance value of each battery cell, which is convenient for quality control and traceability.

2.Battery cycle tester

The battery cycle tester can test the cycle life of battery cells under various charge and discharge conditions. In this process, the actual capacity of the battery cells can also be tested, and the battery cell incoming inspection standards can be compared to determine whether the capacity and cycle life of the battery cells meet the technical and quality requirements.

The battery cell cycle life tester is a computer-controlled testing equipment with single-channel control function that can create basic charging test, discharging test, complex cycle life tests for each channel to run independently.

Feedback the excessive energy to the power grid with high recycling efficiency significantly reduced the cost of electricity consumption.

The battery cycler is suitable for the battery cell cycle life test, battery cell charge and discharge aging test, battery cell performance test, battery cell capacity detection test, IR test, deep-discharging test, function test of high-power lithium-ion battery cells, such as EV battery cells, energy storage battery cells, large capacity battery cells, etc.

Through the tests of the automatic battery sorter and the battery cycler, the main core test items for the incoming inspection of lithium-ion battery cells have been completed.

The remaining items are mainly inspected and sampled manually, such as size inspection and appearance inspection.

The size of lithium-ion battery cells is generally measured with a vernier caliper.

The appearance inspection of lithium ion battery cells is mainly observed by the human eye, such as whether there is damage, leakage, swelling, deformation, stains, coding errors, etc.