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Solution for VOCs Treatment of Exhaust Gas in Lithium Battery Production Workshop

With the rapid development of the new energy vehicle industry, the demand for lithium batteries is increasing. However, in the production process of lithium batteries, a variety of organic solvents need to be used, especially the electrolyte contains a variety of complex components such as N-methyl pyrrolidone (NMP), which will volatilize in the production and processing links to form volatile organic waste gas (VOCs). If it is directly discharged without treatment, it will cause serious pollution to the environment.

Exhaust gas from the production process of lithium batteriesThe main sources can be summarized as follows:

1. Pole plate works:
Stirring slurry coating baking: in this process, NMP(N-methyl pyrrolidone) and other organic solvents are used to prepare the slurry, and after coating by baking to remove the solvent, this process will produce a large number of NMP containing VOCs exhaust gas.
Roll cutting: Although the main production is mechanical noise and a small amount of dust, but in some cases may also be accompanied by a slight emission of VOCs.
Laser die cutting and slitting: This process is mainly cutting and slitting, which produces relatively little exhaust gas, but potential VOCs emissions still need to be considered.
2. Assembly works:
Winding, JR preheating short circuit test, pairing, welding, vacuum drying
3. The conversion project:
Liquid injection, high temperature standing, formation, welding, cell charging and discharging, aging test, film coating

In the production process of lithium batteries, especially the stirring pulping and coating process in polar plate engineering, a large amount of exhaust gas will be generated. The treatment of these exhaust gases is very important to ensure compliance with national environmental protection standards and to protect the environment and employee health.

In order to strengthen the control and management of unorganized emissions of VOCs, China issued the Unorganized Emission Standard for Volatile Organic Compounds GB 37822-2019. The standard points out that the waste gas generated in the production operation should be discharged to the VOCs waste gas collection and treatment system, and discharged after the treatment meets the standard.

MEGAUNITY VOCs Governance Solutions

As a professional industrial waste gas treatment enterprise, MEGAUNITY has designed a set of safe, stable, efficient and economical comprehensive treatment scheme for VOCs emission characteristics in the production process of lithium batteries. The scheme adopts a variety of process combination design, which can be targeted according to different exhaust gas components to ensure the final emission standard.

Combined design of multiple processes

Targeted treatment for different exhaust gas components to meet the needs of different production environments, and can provide customers with full life cycle services from planning, design, manufacturing, construction, commissioning, to operation and maintenance.

pre-treatment filter

It is equipped with a pretreatment filter to filter impurities such as dust/oil mist in the exhaust gas, and can replace the filter material online, which is more convenient and easy to maintain.

Double fan design

The use of a standby fan design, intelligent automatic switching function, can ensure continuous production needs.

Spray tower equipment

Design a special treatment process for acid gases such as hydrogen fluoride contained in the exhaust gas:

Alkali washing tower: remove HF and other acidic substances in waste gas by neutralization reaction chemical absorption;
Water washing tower: used to further absorb the acidic substances and salt alkali substances in the exhaust gas.

Regenerative Oxidation System (RTO)

MEGAUNITY regenerative oxidation system (RTO)It has the characteristics of high thermal efficiency and low operating cost. The system can flexibly choose electricity, combustible gas or organic solvent as heating energy according to the energy situation of the customer site. The regenerative oxidation system developed by MEGAUNITY for the lithium battery production process can efficiently oxidize and decompose VOCs in exhaust gas, has excellent heat recovery efficiency, can efficiently recover the heat generated in the treatment process, and realize self-sustaining operation, thus saving energy consumption and reducing operating costs.

Company Introduction

Suzhou MEGAUNITY Air System Co., Ltd.(Formerly known as Dalian MEGAUNITY Environmental Technology Co., Ltd.), founded in 1994, won the title of national specialized and special new "little giant" enterprise in 2022, and has nearly 300 patents, including 30 authorized invention patents, which was rated as "national intellectual property advantage enterprise". Megaand focuses on the industrial environment air governance of the whole industrial chain of new energy, including air conditioning, exhaust gas treatment and energy conservation and emission reduction measures.

The business scope of the company: