Single carbon tank units and modular carbon tank

The invention discloses a modular carbon tank. The modular carbon tank comprises an assembly body, and the assembly body comprises one or more spliced single carbon tank units; each single carbon tankunit comprises a shell and activated carbon arranged in the shell; and the assembly body comprises a first breather pipe and a second breather pipe, an air passage is formed between the first breather pipe and the second breather pipe, and lots of activated carbon is positioned on the air passage. The invention further provides the single carbon tank units. The single carbon tank units are used for being spliced to form the modular carbon tank. By the adoption of the technical scheme, the flexibility of carbon tank production and use is greatly improved, the carbon tank units and the carbon tank are suitable for universal platform design, the single product design is achieved, and the application is diversified; and in addition, different overall structures can be achieved in different combination modes, so that