Neutron diffraction-based in-situ battery testing device and testing method

Abstract

The invention discloses a neutron diffraction-based battery in-situ high-temperature test device and a test method, the device can realize a battery in-situ neutron diffraction test in a high-temperature environment, the device comprises a battery clamp, a conductive sliding block, a conductive column, a test sealing cavity, a binding post and a potting piece, wherein the test sealing cavity comprises: a sample cylinder, a sealing ring, a sleeve, a fastener and a sealing plate; the battery clamp is used for fixing a to-be-tested battery, the conductive sliding block, the conductive column andthe binding post are used for realizing charging and discharging of the to-be-tested battery in a test process, and the potting piece is used for sealing a connection gap between the binding post andthe test sealing cavity. The device disclosed by the invention can ensure the air tightness in the test process, can ensure the intensity of neutrons incident on the to-be-tested battery, can realizehigh-temperature test of the battery, is suitable for the to-be-tested batteries with different thicknesses, has universality, can be used for in-situ test of batteries, and the transient real crystalstructure information of the batteries can be measured.

Description

Technical field[0001]The invention belongs to the technical field of battery in-situ testing, and specifically relates to a high-temperature in-situ battery testing device and a testing method based on neutron diffraction.Background technique[0002]Due to the water and oxygen sensitivity of battery materials, the electrochemical test process of the battery often needs to be carried out in a sealed environment. In addition, due to the requirements of high temperature environment for the sintering and molding of battery materials, the electrochemical test process of the battery A high-temperature environment is required, so in many practical applications, the above-mentioned dual environmental requirements must be met.[0003]However, current battery testing devices based on neutron diffraction are difficult to meet the above environmental requirements at the same time. The main reasons are: 1) The existing high temperature environment for neutron diffraction is provided by an external h...

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Problems solved by technology

[0003] However, the current battery testing device based on neutron diffraction is difficult to meet the above environmental requirements at the same time

The main reasons are: 1) the existing high-temperature environment for neutron diffraction is provided by an external heating furnace, but the heating furnace itself cannot provide a sealed environment, so it is necessary to design a sample environment with good airtightness; 2) the battery Its own packaging material can achieve excellent sealing, but the packaging material itself cannot withstand high temperature shocks above 200°, so it is necessary to design unpackaged batteries and supporting battery fixtures; 3) The test device takes into account high temperature and sealing at the same time It is also necessary to realize the design of positive and negative insulation, which increases the difficulty of the design of the test device. Therefore, so far, the battery test device based on neutron diffraction can only be carried out at room temperature, and the priority is to ensure the sealing and insulation of the battery. , because charging and discharging cannot be performed under high temperature conditions, the material properties of the battery in the ex-situ state can only be studied by testing, so it is difficult to measure the transient real crystal structure information of the battery in this way under the high temperature test environment

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