Bipolar electrode, laminated battery and preparation method of laminated battery

Abstract

The invention relates to a bipolar electrode, a laminated battery and a preparation method of the laminated battery, the bipolar electrode comprises a flexible conductive substrate, an insulating strip and an insulating layer, the flexible conductive substrate has a first surface and a second surface which are oppositely arranged, each of the first surface and the second surface comprises a positive electrode region, a bending region and a negative electrode region which are sequentially arranged, the positive electrode region is coated with a positive electrode active material, and the negative electrode region is coated with a negative electrode active material; the positive electrode region of the first surface is opposite to the positive electrode region of the second surface, and the negative electrode region of the first surface is opposite to the negative electrode region of the second surface; the bending region of the first surface is opposite to the bending region of the second surface; the bending region can be bent, so that the flexible conductive substrate is bent from an unfolded state to a folded state, and the folded state is that the positive electrode region and the negative electrode region are arranged oppositely; an insulating strip is arranged in the bending region; and the insulating layer is interposed between the positive electrode active material and the negative electrode active material. The bipolar electrode is simple in processing technology and low in processing cost, the energy density of the laminated battery is improved, and the service life of the laminated battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a bipolar electrode, a stacked battery and a preparation method for the stacked battery. Background technique [0002] In the prior art, a stacked battery includes a separator, a positive electrode sheet and a negative electrode sheet. The positive electrode sheet and the negative electrode sheet are stacked alternately. The separator is arranged between the positive electrode sheet and the negative electrode sheet to form a battery cell with the positive electrode sheet and the negative electrode sheet. Both the positive electrode sheet and the negative electrode sheet need to be connected with tabs, and two adjacent tabs are connected to realize the series connection of the battery cells. [0003] However, on the one hand, the arrangement of the tabs occupies the positions of the positive and negative electrodes, which reduces the energy density of the stacked battery; high,...

AI Technical Summary

Problems solved by technology

[0003] However, on the one hand, the arrangement of the tabs occupies the positions of the positive and negative electrodes, which reduces the energy density of the stacked battery; high, and it is easy to cause the stacked battery to fail due to the tab falling off, reducing the service life of the stacked battery. Therefore, there is an urgent need for a bipolar electrode, a stacked battery and a preparation method for the stacked battery to solve The above technical issues

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