Abstract: The present application relates to the technical field of secondary batteries, and more particularly relates to a binder for secondary batteries, a separator, a secondary battery and an electrical apparatus. The binder for secondary batteries is in a ring shape, and includes an acrylate copolymer. The acrylate copolymer has good adhesion, and a contact point of the binder with the ring-shaped structure is a circle line of the ring-shaped binder. The ring-shaped binder has bonding points with larger areas than a spherical binder, such that good bonding performance can be achieved when the usage amount of the binder with the ring-shaped structure is reduced.

Abstract: The present application relates to the technical field of secondary batteries, and in particular to a binder for secondary batteries and a preparation method, a secondary battery, and an electrical apparatus thereof. The binder includes a core structure and a shell structure disposed on a surface of the core structure. The shell structure includes an acrylate copolymer, and the core structure comprises a rigid polymer. The rigid polymer has a crystallinity ranging from 32% to 94%. The binder with a core-shell structure includes the core structure of the rigid polymer. During cold pressing of a battery cell, the rigid polymer acts as a support, making a particle structure of the binder stable, that is, the rigid polymer acts as a support, resulting in an overall increase in the rigidity of the binder.

Abstract: A group user migration method includes: creating a target graphic code and a corresponding first group in a first application in response to a group user migration request, the group user migration request being used for requesting to migrate a user in any group in a second application to a group in the first application; sharing the target graphic code to a target group in the second application in response to a sharing request for the target graphic code; determining a group to which the user belongs in the second application in response to a request of any user in the second application for joining the first group; and joining the user to the first group of the first application in response to determining that the user belongs to the target group.

Abstract: A group user migration method includes: creating a target graphic code and a corresponding first group in a first application in response to a group user migration request, the group user migration request being used for requesting to migrate a user in any group in a second application to a group in the first application; sharing the target graphic code to a target group in the second application in response to a sharing request for the target graphic code; determining a group to which the user belongs in the second application in response to a request of any user in the second application for joining the first group; and joining the user to the first group of the first application in response to determining that the user belongs to the target group.