Device for testing solid-state lithium battery

Abstract

The invention discloses a device for testing a solid-state lithium battery. The device comprises a box body, a first current collector, a second current collector, a bolt, a connecting rod, a first sensor, a sealing cover plate and at least one tab for electrically connecting components in the box body with the outside. Threaded holes are formed in one side wall, in the length direction, of the box body and the first current collector, so that the first current collector can be horizontally moved through rotation of a bolt outside the box body, and a battery to be detected is suspended and clamped between the first current collector and a second current collector which are arranged in the length direction of the box body. The other end of the second current collector is sequentially connected with the connecting rod and the first sensor, so that the first sensor is propped against the inner surface of the other side wall of the box body to test the pressure output by the solid-state lithium battery during operation; wherein the sealing cover plate is provided with a transparent baffle plate for observing the operation of the battery to be detected, and the baffle plate is made of quartz glass, polytetrafluoroethylene or sapphire materials.

Description

technical field [0001] The invention relates to the technical field of battery testing, in particular to a device for testing solid-state lithium batteries. Background technique [0002] In traditional commercial batteries today, the use of liquid electrolytes ensures the fast movement of lithium ions and the good performance of the batteries. However, with the development of science and technology, especially the rapid development of electric vehicles and large-scale energy storage industries, the energy density of commercial lithium-ion batteries has been unable to meet the current needs of use. At the same time, the liquid electrolyte is prone to volatilization and leakage during the long cycle, resulting in a decrease in battery performance. In addition, during the charging and discharging process of the battery, the uneven deposition of Li+ on the surface of the lithium electrode leads to the rapid growth of lithium dendrites, and the battery is prone to safety hazards...

AI Technical Summary

Problems solved by technology

Since the current interface research of solid-state lithium batteries is in its infancy, the stress-strain change process of the electrode / electrolyte interface is still unclear, and there is a lack of effective in-situ stress-strain characterization methods. The problems encountered in the process of testing solid-state lithium batteries include: But not limited to: solid-state lithium battery charging / discharging is the release of powder particles that pollute the mirror or observation window, making it difficult to continuously obtain clear images, and the sensor readings used to collect the expansion force of solid-state lithium batteries drift severely, and this drift is related to temperature or The battery itself has nothing to do, and it is suspected to be related to the current collector holding the lithium battery itself, etc.

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