Slitting and winding Q&A session

Question1: Automatic slitting also has wavy edges, what is the reason? Is it related to slitting knives?

Answer: This may be due to the tension of the winding. One can reduce the tension of the winding, and the other can adjust the tension on both sides of the winding. Otherwise, the side with high tension is prone to the formation of waves. If the wavy edge appears after rolling, the uniformity of the current collector and coating should also be checked; It has something to do with the slitting knife, and a good slitting knife can improve the slitting wavy edge.

Question2: The length of the burr is calculated from the surface of the current collector applied or from the surface of the dressing layer?

Answer: This should be counted from the dressing layer.

Question3: What?happens?if?the green?glue?is?not?properly?applied?and?is?proceeding?

Answer； First?of?all,?we?should?be?clear,?what?is?the?use?of?green?glue??That's what we just talked about. If the green glue is not pasted properly, it may cause the welding site?to puncture the separator, and it is also possible that the electrode?will drop off during the reaction.

Question4: There?will?be?burrs?and?waves?when?slitting,?what?is?a?good?solution?

Answer: n?the?case?of?burrs,?the?solutions are:?(1)?Slitting?equipment:?you?can?change?the?tool?and?adjust?the?accuracy?of?the?slitting?machine;?(2) Current collector: The brittle current collector is not easy to form burrs (this should balance the toughness); (3) Adopt new slitting methods: such as laser slitting, etc.

Wave side mitigation scheme: (1) Slitting tension control: basic automatic slitting; 2)?The?size?of?the?slitting?knife?sleeve?roll?is?optimized.

Question5: What is the risk of metal leakage in the cathode and anode electrode coating?

Answer: The cathode electrode leaks metal, and the possible problem is that the capacity will be low; If the metal leakage at the anode electrode, lithium dendrites may be generated and safety accidents may occur, and even if there is no safety problem, due to local lithium precipitation, it may lead to interface damage and affect the cycling performance.

Question6: Is stack?all about paralleling? What are the advantages of paralleling? What about the drawbacks?

Answer: The internal resistance is small, and it can also be shunted, which is suitable for high rate, and in addition, there is no winding tension, which can reduce the deformation of the battery for the system with large expansion." The disadvantage is that the cost is high, and the production efficiency is lower than that of winding.

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