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Collector film and method for producing a collector film

A current collector foil and structure technology, applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve problems such as process technology consumption, difficulty in control, foil deformation, etc.

Pending Publication Date: 2021-06-29
BAYERISCHE MOTOREN WERKE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, here often there is the problem that undesired deformations of the foil can occur
But this is complex in terms of process technology and is also difficult to control
Furthermore, there is no assurance that the problems mentioned above can actually be avoided

Method used

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  • Collector film and method for producing a collector film
  • Collector film and method for producing a collector film
  • Collector film and method for producing a collector film

Examples

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Embodiment Construction

[0044] figure 1 A portion of a current collector foil is shown in top view, comprising a base material 10 which extends in the longitudinal or web direction B. FIG. The base material 10 comprises an uncoated region 22 and a strip-shaped coated region 20 which is coated with the corresponding active material. The composition of the active material depends on whether the collector foil is an anode or a cathode.

[0045] figure 2 Two further typical forms of collector foils 10 are shown with correspondingly configured coated regions 20 . In the left half of the figure, the coating area 20 is applied intermittently. In the right half of the figure, a design is outlined which has two strip-shaped coating regions 20 next to each other. Such base material 10 is for example cut in the middle. Outlined with reference sign A at image 3 The detailed view shown enlarged in . Especially at image 3 The stretched regions constructed there can be seen in .

[0046] image 3 In on...

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PUM

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Abstract

The invention relates to a collector film, in particular for lithium-ion accumulators, comprising a base material which has at least one coating region on one side or on either side, and wherein an uncoated region of the base material has at least one stretching region which is designed to mechanically decouple the at least one coating region from the uncoated region.

Description

technical field [0001] The invention relates to a current collector foil, in particular a current collector foil for lithium-ion accumulators, a method for producing a current collector foil and a battery cell. Background technique [0002] Regardless of the type of battery, the smallest unit of a lithium-ion battery consists of two electrodes and a separator that separates the electrodes from each other. Because there is an electrolyte that can conduct ions between them. The electrodes are formed from a foil coated with an active material. During calendering, the coated (carrier) foil is compacted by one or more rotating roller pairs. In this process, for example, the porosity of the coating can be adjusted. However, there is often the problem that undesired deformations of the foil can occur here. Especially in uncoated regions of the carrier foil, for example ripples or protrusions etc. arise due to the introduction of force, which lead to a loss of quality and especi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/66H01M4/75
CPCH01M4/0404H01M4/64Y02E60/10H01M4/75H01M4/0435H01M4/667H01M4/70H01M10/0525
Inventor B-I·H·霍格K·滕黑夫
Owner BAYERISCHE MOTOREN WERKE AG