CATL Patente

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An electrode assembly and a preparation method therefor, a battery, and an electrical apparatus. The electrode assembly comprises an electrode plate. The electrode plate comprises a current collector, an active layer, and a tab. The active layer is arranged on at least one side of the current collector in the thickness direction thereof, and the tab is arranged on one side of the current collector in the height direction thereof. In the direction from the side of the current collector where the tab is arranged to the opposite side and in the direction from the current collector to the side away from the current collector, the liquid absorption capacity of the active layer decreases gradually. By enabling the active layer to have different liquid absorption capacities for an electrolyte in a specific direction, the electrolyte wettability of the electrode assembly can be effectively improved. Moreover, the problem of reduced electrolyte wettability of the electrode plate due to the volume expansion or contraction of the electrode plate squeezing out the electrolyte during charging and discharging can also be addressed, thereby improving the electrolyte wettability of the electrode assembly.

A positive electrode active material and a preparation method therefor, a positive electrode plate, a battery cell, a battery, and an electric apparatus are provided, pertaining to the field of battery technology. The positive electrode active material includes: a positive electrode base material, and a first coating layer and a second coating layer sequentially coating a surface of primary particles of the positive electrode base material; where a concentration of lithium element in the first coating layer is lower than a concentration of lithium element in the positive electrode base material, and the second coating layer includes an ion conductor material. The technical solution of this application can improve cycling performance of a battery cell.

A composite current collector, an electrode plate, a secondary battery, and an electric apparatus are provided. The composite current collector includes a first metal layer, a bonding layer, and a second metal layer. The bonding layer includes a first surface and a second surface disposed opposite each other; the first metal layer is located on the first surface; and the second metal layer is located on the second surface. In the composite current collector, by disposing the bonding layer between the first metal layer and the second metal layer, peel strength of the first metal layer and the second metal layer can be enhanced, reducing the risk of detachment of the metal layers during processing.

A composite current collector (3), an electrode plate, a secondary battery (1), and an electric apparatus (2) are provided. The composite current collector (3) includes a substrate layer (31), a first filler (32), a bonding layer (33), and a conductive layer (34). The bonding layer (33) is located between the substrate layer (31) and the conductive layer (34). One end of the first filler (32) is embedded in the substrate layer (31), the other end of the first filler (32) is embedded in the bonding layer (33), a hardness of the first filler (32) is greater than a hardness of the substrate layer (31), and the hardness of the first filler (32) is greater than a hardness of the bonding layer (33). In the composite current collector (3), by introducing the first filler (32) having a greater hardness than the substrate layer (31) and the bonding layer (33), and making one end of the first filler (32) embedded in the substrate layer (31) and the other end embedded in the bonding layer (33), the first filler (32) can serve as a point of force application between the substrate layer (31) and the bonding layer (33), which is conducive to improving the elastic modulus of the composite current collector (3) and reducing the risk of wrinkling during electrode plate processing.

A composite current collector and a preparation method thereof, an electrode plate, a battery, and an electric apparatus are provided. The composite current collector includes a support layer, an adhesive layer, and a conductive layer, where the adhesive layer and the conductive layer are sequentially laminated on two opposite surfaces of the support layer in a direction away from the support layer. The composite current collector effectively improves the peel strength between the support layer and the conductive layer, and reduces the risk of delamination of the composite current collector under prolonged exposure in liquid electrolyte.

A positive electrode sheet and a preparation method therefor, a battery and an electric device. The positive electrode sheet comprises a positive current collector and a positive active layer arranged on at least one surface of the positive current collector, wherein the positive active layer comprises a first active layer and a second active layer, and the second active layer is located between the positive current collector and the first active layer; and the first active layer comprises a first positive active material, and the second active layer comprises a second positive active material, the operating voltage interval of the first positive active material being greater than the operating voltage interval of the second positive active material, and the operating voltage interval of the second positive active material being less than or equal to 3.0 V. The first positive active material starts to be attenuated after a relatively large voltage plateau, and the effect of continuing an operating voltage is achieved by means of the lower operating voltage interval of the second positive active material, thus expanding the voltage interval range of high-power discharge; in addition, the second positive active material still has reaction activity in a relatively low state of charge, and thus has a good discharge capacity.

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A battery cell, a battery apparatus, and an electrical apparatus. The battery cell includes a housing (11), an electrode assembly (2) and an end cover (12), where at least one end of the housing (11) in a first direction is provided with an opening, and the housing (11) comprises a first side wall part (111). The electrode assembly (2) is at least partially accommodated in the housing (11). The electrode assembly (2) includes a positive pole piece (22) and a negative pole piece (23). At least part of the positive pole piece (22) and at least part of the negative pole piece (23) are stacked in a second direction. The second direction is parallel to the thickness direction of the first side wall part (111). The first direction intersects with the second direction. The end cover (12) is used for sealing the opening, and the first side wall part (111) and the end cover (12) are welded to form a first connecting part (51). The first side wall part (111) comprises, arranged in a first direction, a first area (1111) and a second area (1112). The first area (1111) is located between the first connecting part (51) and the second area (1112). The hardness of the first area (1111) is less than the hardness of the second area (1112). The expansion force of the electrode assembly (2) is released by means of the first area (1111) having a lower hardness, so as to reduce the possibility of cracking of the first connecting part (51) of the first side wall part (111).

Disclosed in the present disclosure are a power supply system and a battery management system. The power supply system comprises: an input power supply used for providing an input voltage; a first voltage conversion circuit connected to an output end of the input power supply and used for carrying out voltage conversion on the input voltage provided by the input power supply to generate a first supply voltage; a second voltage conversion circuit used for carrying out voltage conversion on the first supply voltage to obtain a second supply voltage; and at least one voltage stabilizing circuit connected to at least one of the output end of the input power supply, an output end of the first voltage conversion circuit and an output end of the second voltage conversion circuit and used for carrying out voltage conversion on at least one of the input voltage, the first supply voltage and the second supply voltage to obtain at least one third supply voltage.

A battery cell (10), a battery (100), an energy storage device (2000), and an electric device. The battery cell (10) comprises a casing (11). An opening (11a) is formed in an end portion of the casing (11) in a first direction. In the circumferential direction of the opening (11a), the casing (11) comprises first walls (110), corner areas (112), and second walls (113) which are connected in sequence. Each first wall (110) is provided with a first body portion (1100) and a first thickening portion (1101) which are arranged in the first direction, the first body portion (1100) is farther from the opening (11a) than the first thickening portion (1101), and the maximum thickness of the first thickening portion (1101) is greater than that of the first body portion (1100). Each corner area (112) is provided with a second body portion (1120) and a second thickening portion (1121) which are arranged in the first direction, the second body portion (1120) is farther from the opening (11a) than the second thickening portion (1121), and the maximum thickness of the second thickening portion (1121) is greater than that of the second body portion (1120). The provided technical solution can improve the reliability of the battery cell (10).

The present application provides a battery cell, a battery, and an electric device. The battery cell includes a casing, an end cover, and an electrode assembly. The casing has an opening at at least one end along a first direction, the casing includes a first wall, the end cover closes the opening, and the first wall is welded to the end cover to form a first connecting portion. The electrode assembly is at least partially accommodated in the casing, where the electrode assembly includes a positive electrode plate and a negative electrode plate, at least a part of the positive electrode plate and at least a part of the negative electrode plate are stacked along a second direction, the second direction is parallel to the thickness direction of the first wall, and the first direction intersects the second direction. The first wall includes a first zone and a second zone arranged along the first direction, the thickness of the first zone is greater than the thickness of the second zone, and the first zone is located between the first connecting portion and the second zone. This reduces the risk of fatigue cracking in a region of the first wall near the first connecting portion due to the expansion of the electrode assembly, thereby improving the service life of the battery cell.