Test fixture for lithium ion power battery with large length-width ratio

Abstract

The invention discloses a large length-width ratio lithium ion power battery test fixture comprising an upper end panel and a lower end panel used for clamping a power battery. The lower end panel isprovided with a lower end face battery fixing groove, and the upper end panel is provided with an upper end face battery fixing groove at the position of the lower end face battery fixing groove. Theextending directions of the lower end face battery fixing groove and the upper end face battery fixing groove are the same as the length extending direction of the lower end panel, lower end face screw holes are formed in the two sides of the lower end panel, upper end face through holes are formed in the positions, corresponding to the lower end face screw holes, of the upper end panel, bolts arearranged in the upper end face through holes, and a pressure device is connected to the top face of the upper end panel. According to the test fixture for the lithium ion power battery with the largelength-width ratio, accurate positioning is achieved through the positioning grooves, it is guaranteed that the lithium ion power battery with the large length-width ratio is located in the centers of the upper end panel and the lower end panel of the fixture, position deviation in the clamping process is reduced, meanwhile, the distance between the upper end panel and the lower end panel of thefixture is reduced, and eccentric compression moment of the battery in the width direction is reduced.

Description

technical field [0001] The invention relates to a power battery testing device, in particular to a test fixture for a lithium-ion power battery with a large aspect ratio. Background technique [0002] With the development of new energy electric vehicles, the mileage and safety requirements of electric vehicles are also increasing. The capacity of battery cells has increased from the initial 50Ah to more than 200Ah now. In order to improve the cycle performance of large-capacity, high-energy-density batteries , thermal management, safety and other issues, a large aspect ratio lithium-ion power battery with long length and narrow width came into being, but the mechanical structure of the large aspect ratio lithium-ion power battery is eccentrically compressed in the width direction. Under the action of the battery surface, the pressure on the battery surface is inconsistent, which affects the performance of the battery, especially the eccentric pressure inside the battery duri...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the clamping position of the power battery clamp is difficult to be centered in the prior art, and the power battery is prone to displacement after clamping, and provides a power battery that is convenient for centering and is not easy to be displaced, thereby reducing the size of the large aspect ratio soft-packed lithium battery. Test fixture for eccentric pressure on the surface of ion battery

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