Substance feeding device, mixing system, and battery production line

A substance feeding device, comprising:

• a buffer member, wherein the buffer member is configured to store a substance;
• a conveying assembly, wherein one end of the conveying assembly is connected with the buffer member, the conveying assembly has at least two conveying ports, the conveying port is configured to connect with a target device, the conveying assembly comprises a circular pipeline and a conveying member, a first end of the circular pipeline is connected with a discharge port of the buffer member, a second end of the circular pipeline is connected with a return port of the buffer member, and the conveying member is connected between the discharge port and the first end of the circular pipeline;
• a weight meter, wherein the weight meter is connected with the buffer member and is configured to detect a weight of the substance in the buffer member;
• and
• a control assembly, wherein each conveying port is provided with one control assembly, the control assembly is configured to control communication and cutoff of a pipeline between the conveying port and the corresponding target device, the control assembly comprises a valve and a detection member, the valve is disposed on the conveying port and capable of being connected with the target device, the detection member is mounted between the conveying port and the valve, and the detection member is configured to detect an amount of the substance conveyed through the valve;
• wherein the conveying member, the conveying port, the detection member, and the valve are connected in sequence between the buffer member and the target device.