Method for testing optimal reserved gap of lithium ion battery

Abstract

The invention discloses a lithium ion battery optimal reserved gap testing method, which comprises a variable displacement expansive force testing device, the variable displacement expansive force testing device comprises a displacement testing device and an expansive force testing device, the displacement testing device is provided with two clamping plates, and the expansive force testing device is provided with two measuring plates. The two measuring plates are located on the departing sides of the two single batteries respectively, and a battery module is arranged between the two clamping plates; the battery module comprises two top plates arranged in parallel, two side plates are connected between the corresponding ends of the two top plates, a plurality of single batteries arranged between the two side plates are connected between the two top plates through locking bolts, and a single gap is formed between every two adjacent single batteries. The optimal reserved gap of the battery can be well tested, so that the internal resistance increase and the battery attenuation of the lithium ion battery can be inhibited, the attenuation of the capacity of a battery cell is reduced, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a test method for optimally reserved gaps of lithium-ion batteries. Background technique [0002] With the rapid development of new energy vehicles and parts in China, the battery part is the core component of new energy vehicles, and its superior performance determines the development of new energy vehicles. In recent years, new energy vehicles have developed rapidly. [0003] Lithium-ion batteries are the core components of today's new energy vehicles, and their performance directly determines the key to the development of new energy vehicles. Nowadays, the market and application of lithium-ion power batteries are showing explosive development. The application of lithium-ion batteries must have a large number of charge and discharge cycles. When a lithium-ion battery is charged, lithium ions are extracted from the positive electrode and inserted into the graphite of the negative elect...

AI Technical Summary

Problems solved by technology

If the reserved gap is too small, the cell and the diaphragm will also be squeezed, which may accelerate the attenuation of the cell capacity; on the contrary, if the gap between the cells is too large, on the one hand, it will cause space volume At the same time, it will also cause the thickness of the battery to increase, thereby increasing the distance between the positive and negative electrodes of the battery, the unlimited expansion of the pole piece and the shedding of the active material, which accelerates the attenuation of the battery and the increase in internal resistance.

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