The present invention provides a multi-link fuse capable of charging a battery with a configuration simpler than a conventional configuration, and a method for charging a battery by using the multi-link fuse. A multi-link fuse H includes a bus bar body that includes an input terminal, a plurality of external terminals, and a fusion portion provided between the input terminal and the external terminal, and a housing body that covers the bus bar body. The multi-link fuse H includes an extension bus bar for charging a battery by connecting a charging connection terminal. The extension bus bar includes an input extension terminal that overlaps the input terminal and an outer extension portion that extends outward from the bus bar body and connects the charging connection terminal. Both the extension bus bar and the bus bar body are fixed to the housing body in a state where the input extension terminal of the extension bus bar overlaps the input terminal.

The present invention provides a multi-link fuse capable of charging a battery with a configuration simpler than a conventional configuration, and a method for charging a battery by using the multi-link fuse. A multi-link fuse H includes a bus bar body that includes an input terminal, a plurality of external terminals, and a fusion portion provided between the input terminal and the external terminal, and a housing body that covers the bus bar body. The multi-link fuse H includes an extension bus bar for charging a battery by connecting a charging connection terminal. The extension bus bar includes an input extension terminal that overlaps the input terminal and an outer extension portion that extends outward from the bus bar body and connects the charging connection terminal. Both the extension bus bar and the bus bar body are fixed to the housing body in a state where the input extension terminal of the extension bus bar overlaps the input terminal.

A battery module in an energy storage device used with a plurality of battery modules in a battery rack and including a rack fuse that cuts off a circuit when an overcurrent occurs includes a battery cell and a module fuse for cutting off a circuit when overcurrent occurs, the module fuse starts to melt later than a melting completion time point of the rack fuse.

A battery module in an energy storage device used with a plurality of battery modules in a battery rack and including a rack fuse that cuts off a circuit when an overcurrent occurs includes a battery cell and a module fuse for cutting off a circuit when overcurrent occurs, the module fuse starts to melt later than a melting completion time point of the rack fuse.

Provided is a battery pack including a pair of output terminals, a control unit, and a plurality of battery units, where each of the plurality of battery units includes a plurality of battery blocks connected in series, a positive electrode terminal, and a negative electrode terminal, the battery block includes one battery or a plurality of batteries connected in parallel, a fuse is connected between at least one output terminal of the pair of output terminals and a positive electrode terminal or a negative electrode terminal corresponding to the one output terminal, and the fuse is allowed to be fused by the control unit.

Provided is a battery pack including a pair of output terminals, a control unit, and a plurality of battery units, where each of the plurality of battery units includes a plurality of battery blocks connected in series, a positive electrode terminal, and a negative electrode terminal, the battery block includes one battery or a plurality of batteries connected in parallel, a fuse is connected between at least one output terminal of the pair of output terminals and a positive electrode terminal or a negative electrode terminal corresponding to the one output terminal, and the fuse is allowed to be fused by the control unit.

The present disclosure provides a secondary battery which comprises: a cap plate provided with a first electrode terminal; an electrode assembly comprising a main body and a first electrode tab; a first connecting piece connected between the first electrode tab and the first electrode terminal. The first connecting piece includes a first electrode terminal connecting portion, a first electrode tab connecting portion and a first fusing portion. The secondary battery further comprises an insulating piece arranged on the first connecting piece to prevent direct physical contact between the first electrode tab and the first electrode terminal connecting portion by covering at least an edge of the first electrode terminal connecting portion.

A device for breaking the electrical connection to a battery cell (1) in the event of outgassing has the cell pole (3) on the outgassing valve side connected to an electrical contact point (5) at a connection point (4) via a connecting lead (2) which forms a fuse. The device, requiring few components and having a compact design, enables a reliable electrical and thermal protection of neighboring cells of an outgassing battery cell against overloading and prevents the spread of a thermal runaway. The device provides a spacer (6) between the connection point (4) and the contact point (5) that electrically isolates the connection point (4) from the contact point (5) in the event of outgassing and that retains the cell pole (3).

A device for breaking the electrical connection to a battery cell (1) in the event of outgassing has the cell pole (3) on the outgassing valve side connected to an electrical contact point (5) at a connection point (4) via a connecting lead (2) which forms a fuse. The device, requiring few components and having a compact design, enables a reliable electrical and thermal protection of neighboring cells of an outgassing battery cell against overloading and prevents the spread of a thermal runaway. The device provides a spacer (6) between the connection point (4) and the contact point (5) that electrically isolates the connection point (4) from the contact point (5) in the event of outgassing and that retains the cell pole (3).

The present invention detects a predictive abnormal phenomenon in a battery pack and prevents the use of the battery pack before power is shut off at a fuse. The battery pack comprises: a battery cell; a connection unit which is electrically connected to the battery cell and is connected to an external electrical apparatus main body; and a control unit which controls the battery cell, wherein, when detecting an abnormal state such as chattering, the control unit causes a charge prevention signal (LS) and a discharge prevention signal (LD) to be continuously output and makes the charge and discharge of the battery pack impossible (steps 226-228). The continuous output of these prevention signals is configured not to be negated by an operation of a user, and the battery pack can be made unusable by software control.