TECHNICAL FIELD

The present application relates to the technical field of rechargeable batteries and, particularly, relates to an electrode member, an electrode assembly and a rechargeable battery.

BACKGROUND

A lithium ion battery is a rechargeable battery and has advantages of high energy density, high power density, long cycle life and long storage life, etc., and thus is widely applied in portable electronic devices such as cell phones and notebook PCs, and electric transportation vehicles such as electric vehicles and electric bicycles.

An electrode member of the lithium ion battery is generally made of metal material, for example, the positive electrode member is generally made of aluminum foil and the negative electrode member is generally made of copper foil. However, the aluminum foil (or copper foil) readily forms burrs when being punctured by the nail in the nailing test, and the burrs directly lap on the negative electrode member (or the positive electrode member), which results in internal short circuit in the positive electrode member and the negative electrode member, causing fire or explosion of the lithium ion battery.

SUMMARY

In a first aspect, the present disclosure provides an electrode assembly, including an electrode body, wherein the electrode body includes an insulation substrate and a conduction layer provided on a surface of the insulation substrate, wherein the conduction layer includes a first portion and a second portion extending from the first portion, wherein the first portion is coated with an active material and the second portion is not coated with the active material; and a conduction structure, wherein the conduction structure is connected to the second portion.

Optionally, the conduction layer is provided on two opposite side surfaces of the insulation substrate, the conduction structure includes a first conduction element, and the first conduction element is connected to the second portion located on one of the two opposite side surfaces of the insulation substrate.

Optionally, the conduction structure further includes a second conduction element, and the second conduction element is connected to the second portion located on the other one of the two opposite side surfaces of the insulation substrate.

Optionally, the first conduction element is directly connected to the second conduction element; or the conduction structure further includes a conductive connection portion and the conductive connection portion is connected between the first conduction element and the second conduction element.

Optionally, an end of the conduction structure away from the first portion extends beyond an end of the second portion away from the first portion.

Optionally, the second portion has a width greater than that of the conduction structure.

Optionally, the conduction structure and the second portion are welded to each other to form a first welding portion there between, wherein the first welding portion is located at an end of the second portion close to the first portion.

Optionally, the second portion includes a body portion and a transition portion, wherein the transition portion is located between the body portion and the first portion, and the transition portion has a width greater than that of the body portion.

Optionally, the conduction structure includes a body connection portion and a transition connection portion, wherein the transition connection portion is located at an end of the body connection portion close to the first portion, and the transition connection portion has a width greater than that of the body connection portion.

Optionally, the body connection portion is connected to the body portion, and/or the transition connection portion is connected to the transition portion.

In a second aspect, the present disclosure provides an electrode assembly, including the electrode member according to any of the above.

Optionally, a portion of the insulation substrate corresponding to the second portion and the second portion cooperatively form a current guide portion; the number of the current guide portion is more than one, and the number of the conduction structure is more than one; the more than one current guide portions and the more than one conduction structures are stacked up in a manner in which at least one of the one or more conduction structures are arranged between every two adjacent current guide portions of the more than one current guide portions.

In a third aspect, the present disclosure provides a rechargeable battery including a current collection member and the electrode assembly as mentioned above, wherein the electrode member of the electrode assembly is electrically connected to the current collection member by the conduction structure.

In the present disclosure, a conduction structure is added into the electrode member having an insulation substrate, and the conduction structure is connected to the second portion uncoated with any active material, so that every two adjacent current guide portions can be electrically connected by the current guide portion after the electrode members are winded or stacked to form the electrode assembly, without being subject to restriction of the insulation substrate, thereby effectively improving conduction capability of the electrode member.

