CN-224231935-U - In-situ test sample cell for battery

CN224231935UCN 224231935 UCN224231935 UCN 224231935UCN-224231935-U

Abstract

The utility model relates to the field of batteries and discloses a battery in-situ test sample cell, which comprises a first shell and a second shell, wherein a first accommodating cavity with one end closed is arranged in the first shell, the first accommodating cavity is used for accommodating a sample to be tested, the second shell is covered on the first shell so as to enable the other end of the first accommodating cavity to be closed, an observation window is arranged at the top of the second shell, the observation window can observe the sample to be tested in the first accommodating cavity through an observation channel, an annular second accommodating cavity is arranged outside the first accommodating cavity, and a semiconductor temperature control chip is arranged in the second accommodating cavity.

Inventors

LI NING
ZHAI YIZHI
WANG MENG
LI YONGJIAN
SU YUEFENG
WANG YIHONG
CHEN LAI
WANG LIAN
WU FENG

Assignees

北京理工大学
北京理工大学重庆创新中心

Dates

Publication Date: 20260512
Application Date: 20250519

Claims (10)

1. The utility model provides a battery normal position test sample pond, includes first casing and second casing, its characterized in that has one end confined first accommodation chamber in the first casing, and this first accommodation chamber is used for holding the sample that waits to test, thereby the second casing buckle closure is in thereby make on the first casing the other end in first accommodation chamber is sealed, second casing top is provided with observation window, observation window accessible observation passageway is observed wait to test the sample in the first accommodation chamber, be equipped with annular second accommodation chamber outside the first accommodation chamber, semiconductor temperature control piece is installed to the second accommodation intracavity.
2. The sample cell according to claim 1, wherein a first gas channel and a second gas channel are formed in the second housing, outer ends of the first gas channel and the second gas channel are communicated with the outside, and inner ends of the first gas channel and the second gas channel are communicated with the first accommodating cavity.
3. The sample cell according to claim 1 or 2, wherein the first housing is provided with a light transmission window and a light signal collection window, the axes of the light transmission window and the light signal collection window are coincident, external light can enter the first accommodating cavity through the light transmission window, and the light in the first accommodating cavity can return to the outside through the light signal collection window.
4. A sample cell according to claim 3, wherein a limit sleeve is arranged in the first accommodating cavity, the limit sleeve is made of transparent material, and an inner cavity of the limit sleeve forms the first accommodating cavity.
5. The cuvette according to claim 4, wherein a pre-tightening structure is further provided between the second housing and the sample to be tested, the pre-tightening structure being adapted to apply a pre-set axial pre-tightening force to the sample to be tested.
6. The sample cell according to claim 5, wherein a first gasket is arranged at the bottom of the first accommodating cavity, the limit sleeve is arranged on the first gasket, the first gasket is made of metal, one of the positive electrode and the negative electrode of the sample to be tested is in contact with the first gasket, and the first gasket is connected with the corresponding electrode of the power supply; The surface that is close to the pretension structure of sample to be tested is provided with the second gasket, and this second gasket is the metal material, the pretension structure with the second casing is the metal material, the one end of pretension structure will the second gasket supports tightly on the other pole of sample to be tested, the other end of pretension structure supports tightly on the second casing, the second casing is connected with the corresponding pole of power.
7. The cuvette according to claim 6, wherein the pretensioning arrangement comprises at least one pretensioning spring, the uppermost pretensioning spring being abutted against the second housing, the lowermost pretensioning spring being abutted against the sample to be tested.
8. The sample cell according to claim 7, wherein the pre-tightening springs are belleville springs, all belleville springs are stacked together along the axial direction of the first accommodating cavity, a first hole is formed in all belleville springs in a penetrating manner, a limiting column with a hollow inside is arranged on the surface, close to the belleville springs, of the second shell, the limiting column stretches into the hole of the uppermost belleville spring, the uppermost belleville spring is abutted against the second shell, the lowermost belleville spring is abutted against the second gasket, and a second hole is formed in the second gasket; And the cavity in the limit column, the first hole and the second hole are communicated to form the observation channel.
9. The cuvette according to any one of claims 4-8, wherein the viewing window is covered with an optical glass.
10. The sample cell according to claim 9, wherein a third hole is formed in the first housing corresponding to the second accommodating cavity, and a power line of the semiconductor temperature control chip passes through the third hole and is connected with the semiconductor temperature control chip.

Description

In-situ test sample cell for battery Technical Field The utility model relates to the field of batteries, in particular to a battery in-situ test sample cell. Background With the rapid development of new energy automobiles, aerospace, power grid energy storage and other technologies, the lithium ion battery has higher energy density, safety and environmental adaptability requirements. High specific energy batteries, represented by lithium metal negative electrodes, high nickel ternary, lithium rich layered positive electrode material systems, are widely recognized as important candidates for next generation energy storage systems. However, in practical application, especially under the wide temperature range condition (for example, -20 ℃ to 70 ℃), the battery still faces serious problems of safety reduction, cycle life reduction and the like, and the popularization and application of the battery in complex climates and extreme working conditions are restricted. The specific failure process generally involves the multi-factor combined action of positive electrode crystal structure change, lattice oxygen release, electrolyte decomposition, lithium dendrite growth, migration deposition of transition metal ions and the like, and has high dynamic, local and multi-scale coupling characteristics. Therefore, there is a need for an in situ testing apparatus with multi-modal functionality that can accommodate extreme environmental changes, and which is adapted to provide deep resolution of these material evolution and performance degradation mechanisms. However, the existing in-situ test apparatus generally lacks an integrated temperature control component, and cannot accurately adjust and stably maintain the battery operating environment in a wide temperature range. Disclosure of utility model The utility model aims to solve the problem that the temperature of the battery can not be regulated and controlled in the wide temperature field in the prior art, and provides a battery in-situ test sample cell which can regulate and control the temperature of the battery operating environment in the wide temperature field. In order to achieve the above purpose, the utility model provides a battery in-situ test sample cell, which comprises a first shell and a second shell, wherein a first accommodating cavity with one end closed is arranged in the first shell, the first accommodating cavity is used for accommodating a sample to be tested, the second shell is buckled on the first shell so that the other end of the first accommodating cavity is closed, an observation window is arranged at the top of the second shell, the sample to be tested in the first accommodating cavity can be observed through an observation channel, an annular second accommodating cavity is arranged outside the first accommodating cavity, and a semiconductor temperature control chip is arranged in the second accommodating cavity. By adopting the technical scheme, the semiconductor temperature control chip can realize active heating or cooling of the environment of the sample to be tested by adjusting the direction and the magnitude of the input current based on the Peltier effect. Compared with the traditional temperature control mode adopting a heating plate or a liquid circulation system, the semiconductor temperature control sheet has the remarkable advantages of small volume, high integration level, high response speed and high temperature control precision, can complete the temperature rising or reducing process of the sample cavity in a short time, supports the wide temperature range stable operation of-20 ℃ to 70 ℃, does not need large external auxiliary equipment, and greatly improves the compactness of the integral structure and the space utilization efficiency. Preferably, a first gas channel and a second gas channel are arranged in the second shell, the outer ends of the first gas channel and the second gas channel are communicated with the outside, and the inner ends of the first gas channel and the second gas channel are communicated with the first accommodating cavity. The outside refers to the external environment. By adopting the structure, the gas can be blown in through the first channel, so that the gas generated during the operation of the battery can flow out from the second channel along with the blown-in gas, and the collection and analysis are convenient, thereby meeting the detection requirement of DEMS (in-situ differential electrochemical mass spectrometer). Preferably, the first housing is provided with a light transmission window and a light signal collection window, the axes of the light transmission window and the light signal collection window are coincident, external light can pass through the light transmission window to enter the first accommodating cavity, and the light in the first accommodating cavity can pass through the light signal collection window to return to the outside. When the structure is adopted for X-ray o