Hot press molding mechanism for electrode lugs of lithium-ion power batteries

Abstract

The invention relates to a hot press molding mechanism for electrode lugs of lithium-ion power batteries. The hot press molding mechanism comprises a middle hot press mechanism and a metal conductor heating mechanism, wherein the middle hot press mechanism is used for compositing electrode lug adhesives and a metal conductor together through hot press. The middle hot pressing mechanism is provided with an upper hot press end socket and a lower hot press end socket which are synchronously and oppositely driven by cylinders. A left metal strap heating mechanism and a right metal strap heating mechanism are arranged on the two sides of the hot pressing mechanism respectively. Each metal strap heating mechanism is provided with an upper heating pipe and a lower heating pipe which are arranged on a support to form a 45-degree angle. The perpendicular distance between the surfaces of modulator tubes and the surface of a metal strap is 20 mm. The power of the four heating pipes is regulated to be the same. Every two heating pipes in the same set are on a perpendicular straight line and fixedly arranged on the two sides of the metal conductor to form a shape like a Chinese character 'ba'. The horizontal distance between the heating pipes and the end sockets is 15 mm. By means of the hot pressing forming mechanism, the hot sealing molding time of the power large electrode lugs can be effectively shortened, the excellent hot sealing adhesion effect is provided, the size stability and the appearance of rubber blocks molded through hot press are improved, the hot press molding mechanism is suitable for continuous production, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the manufacturing technology of the tab of the lithium-ion power battery, in particular to a hot-press forming mechanism of the tab of the lithium-ion power battery. Background technique [0002] The metal conductor of the tab of the vehicle power battery is relatively wide and thick. It needs enough time to absorb a large amount of heat energy when it is thermally combined with the tab glue. When the surface temperature exceeds the melting point of the tab glue, it can be tightly bonded with the tab glue, reaching Technical requirements (peeling temperature of glue and metal conductor ≧10N / 10mm), the existing production technology mainly adopts the hot pressing molding method of manual hot pressing machine, and generally needs hot pressing time of 60-80s / time. Since the adhesive tape will also be heated for a long time when it is heated and deformed, it will expand and overflow greatly, resulting in an ugly appearance of the t...

AI Technical Summary

Problems solved by technology

Since the adhesive tape will be heated for a long time, deform and expand greatly during hot pressing, resulting in an unsightly appearance of the tabs, this method has low production efficiency and is not suitable for automatic production

At present, there is also a method of shortening the hot-pressing time by using copper blocks on both ends of the main hot-pressed copper plate on the automatic forming machine to auxiliary heat the conductor to achieve a better forming effect. This processing method has a width of less than 30mm and a thickness of less than 0.2 mm tabs have a better effect, but the effect is not ideal for tabs with a width greater than 30mm and a thickness ≧0.2mm, or the glass strength of the hot-pressed tabs and metal conductors cannot meet the specification requirements. Either the hot-pressed tab tab glue expands seriously and looks ugly, and the other is to use a high-frequency automatic tab forming machine to instantly heat the metal conductor to the required temperature with high frequency, and instantly pressurize the rubber block to achieve the desired temperature. Effective bonding of metal conductors, but high-frequency heating has significant disadvantages: The fluctuation range is large. For the power battery tab, the metal conductor is relatively wide, and high-frequency heating cannot ensure that the temperature between the middle and both ends of the conductor is uniform. The temperature difference between the two ends and the middle part will be relatively large. Consistent package bonding temperature of the When the high frequency is used continuously, the sudden high frequency frequency will be greatly reduced or even not working from time to time, and it will automatically recover after a while. This situation is generally difficult to find and judge, which is very important for the production of continuous automation tabs. It brings great difficulties, and the defective products produced when the high frequency does not work are difficult to find and remove, causing serious safety hazards to the battery

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