CATL Patente

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A cutting apparatus for composite electrode sheets and a battery production line, belonging to the technical field of processing apparatuses. The cutting apparatus for composite electrode sheets comprises: a rack; a compounding mechanism, which is mounted on the rack and is configured to cooperate with an adsorption mechanism to compound a separator and an electrode sheet to obtain a composite electrode sheet; the adsorption mechanism, which is mounted on the rack and is configured to adsorb the composite electrode sheet; and a cutting mechanism, which is mounted on the rack and is configured to cooperate with the adsorption mechanism to cut off the composite electrode sheet.

A composite separator and a preparation method therefor, and a battery and an electric device. The composite separator comprises a base membrane, wherein the base membrane has a first surface and a second surface arranged opposite each other, a non-woven fabric layer being provided on the first surface of the base membrane, the non-woven fabric layer comprising non-woven fabric material formed by polymer fibers, and the porosity of the non-woven fabric layer being at least 40%. The composite separator is used in the battery, the non-woven fabric layer being adjacent to a negative electrode sheet of the battery. The composite separator is formed by compounding the base membrane and the non-woven fabric formed by the polymer fibers, and when the composite separator is used in the battery, the non-woven fabric layer is close to the side of the negative electrode sheet; thus, on the basis of the characteristics of the non-woven fabric layer of the composite separator, the cycle stability, cycle life and safety of the battery are improved.

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This application discloses a cell adhesive attachment system and method, related to the field of batteries. The cell adhesive attachment system includes: a welding device (11, 81), configured to weld a tab (10b) of a cell (10a) to an adapting piece (10c) to obtain a target cell (100); a battery inspection apparatus (12, 82), configured to inspect the target cell (100), where the battery inspection apparatus (12, 82) includes: an image acquisition device (22), configured to acquire an image of a tab area (10d) of the target cell (100); and a light source (21), including multiple sub-light sources arranged circumferentially along an image acquisition channel of the image acquisition device (22), and configured to project light onto the tab area (10d), where under different operating modes of the light source (21), an on/off state of at least one of the sub-light sources varies; an adhesive attachment device (13, 83), configured to perform adhesive attachment processing on the obtained target cell (100); and a transfer device (14, 84), configured to transfer the welded target cell (100) to the battery inspection apparatus (12, 82) and to transfer the target cell (100) with a normal inspection result to the adhesive attachment device (13, 83).

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A battery cell (20), a battery (100), and an electric device are disclosed. The battery cell (20) includes a housing (21) and a pressure relief component (214), where the housing (21) has a first wall portion (211), the first wall portion (211) has a first outer surface (2111) facing away from an interior of the housing (21). The pressure relief component (214) is disposed on the first wall portion (211), where the pressure relief component (214) includes a first weak portion (2145), and the pressure relief component (214) is configured as capable of rupturing along at least a part of the first weak portion (2145) during pressure relief of the battery cell (20). A minimum radial dimension of the first outer surface (2111) is A, a radial direction is a direction passing through a center point of the first outer surface (2111), and an outer edge of the first outer surface (2111) is offset toward the center point of the first outer surface (2111) by a predetermined distance L₁ to form a first edge (2143), where L₁ = 0.05*A. Along a thickness direction of the first wall portion (211), a projection of the first weak portion (2145) on the first outer surface (2111) is located within the first edge (2143). The first edge (2143) defines a first region (2144) with lower stiffness, so that a thickness of the first weak portion (2145) located in the first region (2144) is greater under the same burst pressure, making the first weak portion (2145) less likely to rupture prematurely, thereby improving the lifespan of the battery cell (20).

Disclosed in embodiments of the present application are a battery cell, a battery, and an electric device. The battery cell comprises: a plurality of walls, wherein the plurality of walls include a first wall, a second wall and a third wall, the first wall and the second wall are arranged opposite to each other, and the third wall is used for connecting the first wall to the second wall; an electrode assembly, wherein a first end face of the electrode assembly is provided with a first tab and a second tab of opposite polarity, and the first end face is the end face of the electrode assembly facing the third wall; a first electrode terminal arranged on the first wall and electrically connected to the first tab; a second electrode terminal arranged on the second wall and electrically connected to the second tab; and a pressure relief mechanism arranged on the third wall. The battery cell, the battery, and the electric device of the embodiments of the present application can improve the reliability of the battery.

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