Introduction to the battery pack housing The battery pack housing...
Slitter & Die-cut
After coating and drying, the stripping high strength of live matter and fluid collecting foil is very low, and it is necessary to roll it to enhance the bonding strength of live matter and foil, to prevent it from peeling off in the process of electrolyte immersion and battery use. The roll ensures that the surface of the pole piece is smooth and flat, to prevent the burr on the coating surface from puncting the diaphragm and causing short circuit, and to compress the volume of the battery core. Improve the energy density of the battery core, reduce the porosity between the living matter, conductive agent and binder in the electrode chip, reduce the resistance of the battery and improve the performance of the battery.
Cutting process
Cutting process refers to the width of the large coil or coil products, according to the actual need for longitudinal cutting into the required width of the volume.
The main technical requirements are that the pole piece after slitting can not appear wrinkling and depowder, and the accuracy of the size of the pole piece is high. At the same time, the burr on the edge of the pole piece is small, otherwise the dendrite will be generated on the burr to puncture the diaphragm, resulting in a short circuit inside the battery.
Die cutting process
According to the battery design structure and specifications, need to cut the pole piece.
Generally, for the winding battery, the pole piece is divided into strips according to the design width. For laminated cells, the pole pieces are cut into slices accordingly.
The main technical requirements are that the pole piece after die cutting can not appear burr, powder, bad size and so on.
Two main processes
there is a tool wear problem, which is easy to cause process instability, resulting in poor cutting quality of the pole piece, resulting in a decline in battery performance.
Laser cutting using high power density laser beam irradiation cutting battery pole piece, so that the pole piece is quickly heated to a very high temperature, rapid, vaporization, ablation or ignition point and the formation of holes, as the beam moves on the pole piece, holes continuously form a very narrow width of the slit, complete the cutting of the pole piece. Among them, laser energy and cutting moving speed are the two main process parameters, which have a great impact on the cutting quality.
Process parameter
In the process of electrode cutting, the quality of the edge of the electrode cutting has an important impact on the performance and quality of the battery, including:
(1) burrs and impurities will cause short circuit in the battery, cause self-discharge and even thermal runaway;
(2) poor dimensional accuracy, it is impossible to ensure that the negative electrode fully covers the positive electrode, or the diaphragm completely separates the positive and negative electrode pieces, causing battery safety problems;
(3) Material thermal damage, coating off, etc., resulting in loss of activity of the material, unable to play a role;
(4) the roughness of the cutting edge causes the non-uniformity of the charging and discharging process of the pole piece;
The main process control point of pole cutting is to avoid these problems and improve the process quality.
Home energy storage product series
A lithium battery pack for home energy storage systems, which is compatible with solar panels and the sun The inverter can work together with the power grid to power household appliances, and it can also be used as a For off grid systems.
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