Cell gas generation testing system

Abstract

The invention discloses a cell gas generation testing system. The system comprises a sealed testing box, an inert gas source and an analyzing device and is characterized in that the sealed testing boxis used for accommodating a cell and is provided with a gas inlet and a gas outlet; the inert gas source is connected with the gas inlet through a gas inlet pipeline; the analyzing device is connected with the gas outlet through a gas outlet pipeline, the gas outlet pipeline is provided with a connector, and the connector is connected with a vacuum pump through a first pipeline. Compared with theprior art, the system has the advantages that the gas generation behavior of the cell at every moment can be monitored, and high testing precision is achieved; the analyzing device is used to analyzethe components and content of the gas generated by the cell, so that qualitative and quantitative analysis of cell gas generation is achieved; the cell is located in the inert atmosphere in the wholegas generation testing to avoid the risks of accidents.

Description

technical field [0001] The invention belongs to the field of battery technology, and more specifically, the invention relates to a battery cell gas production test system. Background technique [0002] Lithium-ion batteries will produce gas during the process of production and use. The mechanism of battery gas production caused by different reasons is different, and the gas production components and the proportions of each component are different, and for the battery gas production caused by the same reason, the gas production components and The proportion will also vary depending on the material, electrolyte formulation and usage environment. Taking chemical gas production as an example, ethylene carbonate, propylene carbonate and ethyl methyl carbonate produce different gases during the chemical conversion process. In addition, during the storage process of the battery, the gas production components are different with the change of the state of charge (SOC) of the batter...

AI Technical Summary

Problems solved by technology

[0004] However, the existing technology has the following problems: 1) The process of gas extraction and sample injection is easily disturbed by the air, causing the test results to deviate from the actual value; 2) When the battery cell produces too little gas, the GC gas needle can hardly extract gas Or most of the extracted gas is air, so effective data cannot be obtained; 3) It is impossible to characterize the gas production of the battery in each stage in situ. Taking the overcharge of the battery as an example, if you want to analyze the overcharge of the battery For the gas production behavior in the process, it is necessary to take a large number of batteries of the same design, charge each battery cell to a different SOC, and then conduct a GC test on the gas production of each battery cell, and then correlate the change of gas production with SOC , the above method is difficult to ensure the consistency of the cell and accurate test conditions

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