Top seal head

Abstract

The invention discloses a top seal head. A top sealing head pair and a limiting sleeve piece are arranged. In an actual application process, the tab groove obliquely extends towards the direction close to the film body sealing edge at the side wall position to form the chamfering step. Due to the existence of the chamfering step, the tolerance allowance of the tab position of the soft package battery can be effectively increased. Even if the positions of the tabs are not accurately aligned, a certain deviation occurs leftwards or rightwards, the tab does not enter the space between the upper film body sealing edge and the lower film body sealing edge, and is still positioned between the upper tab groove and the lower tab groove. The PP layer on the tab and the PP layer on the aluminum plastic film corresponding to the tab cannot be extruded away. Therefore, the aluminum layer in the top-sealed aluminum-plastic film cannot be directly exposed, the overall sealing performance of the top-sealed soft package battery can be greatly ensured, the insulation reject ratio of the soft package battery is greatly reduced, and meanwhile, the short circuit phenomenon of the top-sealed soft package battery can be well prevented.

Description

technical field [0001] The invention relates to the technical field of pouch battery production, in particular to a top sealing head. Background technique [0002] At present, a battery refers to a cup, tank or other container or part of a composite container that contains an electrolyte solution and a metal electrode to generate an electric current, and is a device that can convert chemical energy into electrical energy. It has positive pole and negative pole. As technology advances, batteries generally refer to small devices that can generate electricity. Such as solar cells. The performance parameters of the battery mainly include electromotive force, capacity, specific energy and resistance. Using the battery as the energy source can obtain stable voltage, stable current, stable power supply for a long time, and a current that is little affected by the outside world, and the battery structure is simple, easy to carry, easy to charge and discharge, and is not affected ...

AI Technical Summary

Problems solved by technology

[0006] Problem 1. Since the tab top sealing groove 21 is a right-angle groove structure, when performing the top sealing process, it is necessary to align the tabs of the pouch battery with the tab top sealing grooves of the upper and lower top sealing head pieces 20 21. If there is a certain distance offset, the tabs of the pouch battery will partially enter the area of ​​the aluminum-plastic film edge sealing 22. When the upper and lower top seals 20 are closed, part of the tabs of the pouch battery will be closed. It will be pressed and held between the aluminum-plastic film edges 22 of the upper and lower top head pieces 20. Since the lug top seal groove 21 is a groove-shaped structure, when the upper and lower top head pieces 20 are closed, the upper and lower The force of the two lug top seal grooves 21 on the lugs is much smaller than the force of the upper and lower aluminum-plastic film edges 22 on the aluminum-plastic film, which will lead to entering the area of ​​the aluminum-plastic film edge 22 The PP layer on the tab and the PP layer on the aluminum-plastic film corresponding to the tab entering the area of ​​the aluminum-plastic film edge sealing 22 are squeezed away together, resulting in the direct exposure of the aluminum layer in the aluminum-plastic film to the tab. Integrate, when the above-mentioned pouch battery is formed later, it is necessary to charge the pouch battery. At this time, the aluminum layer of the aluminum-plastic film, the electrolyte and the tabs will form a complete circuit, and redox reactions will occur inside, resulting in aluminum The aluminum layer is continuously consumed, and the aluminum-plastic film is the main component of the packaged soft-pack battery. If the aluminum layer is continuously consumed, the overall sealing performance of the soft-pack battery will continue to decline, which will eventually lead to leakage of the internal electrolyte. It is a very large safety hazard, and it will also greatly increase the defective rate of soft pack batteries;

[0007] Question 2, based on the background of Question 1, when the tabs are in contact with the exposed aluminum layer, the positive tab, aluminum layer, and negative tab on the pouch battery may form a complete circuit, that is, the pouch battery is short-circuited , will also cause damage to the pouch battery

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