Battery pole sheet heating system and heating method

Abstract

The invention discloses a battery pole sheet heating system and a battery pole sheet heating method. The heating system comprises an electromagnetic heater (1) and a temperature sensor (2); the electromagnetic heater (1) comprises an electromagnetic heating head (11) and a power source controller (12); the power source controller (12) is externally connected with a power source; the power source controller (12) is in control connection with the electromagnetic heating head (11); the temperature sensor (2) and the electromagnetic heating head (11) correspond to each other and are respectively distributed on the upper side and lower side of a battery pole sheet; the power source controller (12) can control the electromagnetic heating head (11) to generate a magnetic field; the battery pole sheet can move to cut the magnetic induction lines of the magnetic field to generate heat; the temperature sensor (2) is used for detecting the temperature of the battery pole sheet; and the temperature sensor (2) is connected with the power source controller (12). Based on the heating mode of the heating system, the battery pole sheet can be uniformly heated, and the phenomenon of non-uniform heating is avoided.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a battery pole piece heating system and a heating method. Background technique [0002] Aluminum foil is usually used as the base material of positive electrode sheet of lithium battery. In the rolling production of lithium batteries, due to the inconsistent elongation of the coated area of ​​the pole piece and the aluminum foil, there will be folding of the aluminum foil, which will lead to the broken strip of the pole piece, which will not be able to produce normally and affect the product quality. Therefore, it is necessary to heat and soften the pole piece base material of the lithium battery, so as to facilitate the stretching and wrinkle removal of the pole piece, and ensure that the extension of the aluminum foil and the coating area is basically consistent. [0003] However, in the existing rolling production process of lithium battery pole pieces, a f...

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Problems solved by technology

[0003] However, in the existing rolling production process of lithium battery pole pieces, the forced stretching method is used to ensure that the extension of the aluminum foil and the coated area is basically the same.

The disadvantages of this method are: the aluminum foil is required to have high tensile strength and no fine gaps are allowed on the edge, and the compaction density is not high, which cannot meet the large capacity requirements of the battery.

However, the existing electromagnetic heating methods for pole pieces all fail due to aluminum foil burning or uneven heating at local low temperatures, which is also the biggest bottleneck in the production of high-capacity lithium batteries.

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