The cause of soft package lithium battery bilge gas mainly is?

Source: 2020 - 03 - 31 that hits: time in the normal voltage range, gas production is very small, and most are hydrocarbons. When an exception occurs when the gas, can produce a large amount of gas, the electrode interface structures, causes the electrolyte differentiation failure, serious when breakthrough packaging area, leakage and corrosion risk. From two aspects of data design and production process of abnormal gas control is very necessary. First, you need a design and optimization of data and the electrolyte system, to ensure the fine stability of the SEI film formation, improve the stability of positive data, control the occurrence of abnormal gas. In addition because cobalt acid lithium anode materials and electrolyte interactions, will make its product differentiation catalytic electrolyte solvent differentiation, so information positive exterior wall coating, not only can increase the data structure of safe sex, can also be positive contact with the electrolyte, reduce the activity of the anode gas catalytic differentiation. The appearance of particle are data, therefore, form a stable and complete coating is also one of the main development direction. Don't need to use it as a strict operation and control of process parameters, to ensure the reliability of encapsulation, avoid too much water in the battery led to the expansion of gases. The control method is as follows: ( 1) After the completion of the dry battery winding is enough, to avoid too much water inside the diaphragm; ( 2) Strict control of vacuum after baking the charging time and humidity of drying chamber; ( 3) Ensure filler glove box seal; ( 4) Control of water and free acid content in electrolyte; ( 5) Standard electrolyte storage environment and sealing conditions, avoid excessive moisture in the process of use and storage into electrolyte; ( 6) After vacuum sealing exhaust formation static pressure or external airbags; ( 7) Choose multi-step placed into furnace, high temperature process, ensure the gas complete; ( 8) Improve the packaging reliability. The occurrence of gas bilge water mainly produce gas is normal and abnormal gas, in order to control the battery later abnormal gas, need data from the design optimization and process control; Choose a secure complete coating anode material, cut off the electrolyte and the positive response of the difference, with film electrolyte additive, is used to ensure safe sex of SEI gas attack, under the premise of technological process, to ensure that the packaging reliability, enhance the operation of the system, such as water and oxygen sensitive material is useful in battery internal bilge gas solution.