Disclosed herein is a battery module. The battery module can include a cell stack having battery cells stacked in one direction and at least one lead overlapping portion formed as electrode leads of the battery cells overlap each other, and a voltage sensing member. The voltage sensing member can have at least one sensing part directly connected to the at least one lead overlapping portion. Each lead overlapping portion and each sensing part can be fixed and combined by a rivet member.

A battery includes two battery cells arranged along a first direction and including two electrode terminals opposite to each other along the first direction. A first electrode of the two electrode terminals is disposed at an end of a first battery cell of the two battery cells along the first direction, and a second electrode of the two electrode terminals is disposed at an end of a second battery cell of the two battery cells along the first direction. Surface contact is formed between two end faces of the two electrode terminals, respectively. The two end faces are opposite to each other along the first direction. The two electrode terminals are configured to be fixedly connected to each other along an outer periphery of at least one of the two end faces to implement electrical connection between the two battery cells.

Disclosed is a disassembling tool for a secondary battery. The disassembling tool includes a first rotation member configured to be rotatable and to allow a nut to be coupled thereto; a connection shaft coupled to the first rotation member; a second rotation member coupled to the connection shaft to transmit a rotational force to the connection shaft; and a housing, in which the connection shaft is disposed. The housing is inclined with respect to a virtual horizontal line parallel to a ground surface.

Disclosed is a disassembling tool for a secondary battery. The disassembling tool includes a first rotation member configured to be rotatable and to allow a nut to be coupled thereto; a connection shaft coupled to the first rotation member; a second rotation member coupled to the connection shaft to transmit a rotational force to the connection shaft; and a housing, in which the connection shaft is disposed. The housing is inclined with respect to a virtual horizontal line parallel to a ground surface.

Aspects of the present disclosure relate to a terminal fastener for electrically connecting a battery terminal associated with at least part of a traction battery to an electrical circuit of a vehicle, the terminal fastener comprising: a terminal engaging portion configured to engage with the battery terminal; a tool receiving portion configured to receive a tool to fasten the terminal engaging portion to the battery terminal; and insulation configured to cover at least part of the terminal fastener.

Aspects of the present disclosure relate to a terminal fastener for electrically connecting a battery terminal associated with at least part of a traction battery to an electrical circuit of a vehicle, the terminal fastener comprising: a terminal engaging portion configured to engage with the battery terminal; a tool receiving portion configured to receive a tool to fasten the terminal engaging portion to the battery terminal; and insulation configured to cover at least part of the terminal fastener.

Disclosed in the present disclosure are a welding-free connector electrically connected to a battery cell, and a lithium ion battery comprising the connector. The connector comprises current collector bars, the current collector bars being clamped with a connecting plate; the connecting plate comprises a back plate and clamping posts fixedly provided at one side of the back plate at intervals, and grooves for clamping with the current collector bars are formed between adjacent clamping posts; a thermal decomposition material layer is coated on the periphery of the clamping posts or the inner side walls of the grooves, and the thermal decomposition material layer is formed by compounding a thermosensitive resin and a modified material; and the back plate and the clamping posts are both made of a high-thermal-conductivity insulating material.

Disclosed in the present disclosure are a welding-free connector electrically connected to a battery cell, and a lithium ion battery comprising the connector. The connector comprises current collector bars, the current collector bars being clamped with a connecting plate; the connecting plate comprises a back plate and clamping posts fixedly provided at one side of the back plate at intervals, and grooves for clamping with the current collector bars are formed between adjacent clamping posts; a thermal decomposition material layer is coated on the periphery of the clamping posts or the inner side walls of the grooves, and the thermal decomposition material layer is formed by compounding a thermosensitive resin and a modified material; and the back plate and the clamping posts are both made of a high-thermal-conductivity insulating material.

Disclosed herein is a method for manufacturing an electrode assembly. The method may include a step of applying an electrode active material to at least a portion of an electrode collector, which is formed by sequentially stacking a first electrode foil, an electrode insulating layer, and a second electrode foil, to manufacture an electrode, a step of stacking the electrode and a separator, and a step of connecting an electrode lead to a non-coating portion that is not coated with the electrode active material on the electrode collector. The step of connecting the electrode lead may include passing a coupling part through the electrode collector and the electrode lead to connect the electrode collector to the electrode lead.

Disclosed herein is a method for manufacturing an electrode assembly. The method may include a step of applying an electrode active material to at least a portion of an electrode collector, which is formed by sequentially stacking a first electrode foil, an electrode insulating layer, and a second electrode foil, to manufacture an electrode, a step of stacking the electrode and a separator, and a step of connecting an electrode lead to a non-coating portion that is not coated with the electrode active material on the electrode collector. The step of connecting the electrode lead may include passing a coupling part through the electrode collector and the electrode lead to connect the electrode collector to the electrode lead.