A lithium ion battery according to the present invention comprises a positive electrode, a negative electrode, a positive electrode lead that is connected to the positive electrode, an insulation tape that covers the positive electrode lead, and an electrolyte solution. The insulation tape comprises a base material layer that is mainly composed of an organic material, and a filler layer that is provided on the base material layer; the filler layer contains an oxide compound of an alkaline earth metal; and the electrolyte solution contains fluorine.

An electrode includes an active material coating portion coated with an electrode active material on at least one surface of an electrode collector; and an active material non-coating portion which is at one side of the active material coating portion, is not coated with the electrode active material, and includes at least one slit extending from one end to the another end thereof, wherein in each slit of the at least one slit, a hole is passes through a point at which the respective slit and the active material coating portion meet each other.

An electrode includes an active material coating portion coated with an electrode active material on at least one surface of an electrode collector; and an active material non-coating portion which is at one side of the active material coating portion, is not coated with the electrode active material, and includes at least one slit extending from one end to the another end thereof, wherein in each slit of the at least one slit, a hole is passes through a point at which the respective slit and the active material coating portion meet each other.

An electrochemical device includes a negative electrode plate including a negative current collector provided with a negative active material layer and a positive electrode plate including a positive current collector provided with a positive active material layer. The positive active material layer includes a first region. The first region includes a second region and a third region that does not overlap the second region by any area. A first insulation layer is disposed on a surface of the second region. The negative active material layer includes a fourth region facing towards the third region. An area S2 mm.sup.2 of the second region and an area S1 mm.sup.2 of the first region satisfy: S2<S1≤1.5S2, and a ratio CB of a unit-area capacity of the fourth region to a unit-area capacity of the third region is greater than or equal to 1.1.

An electrochemical device includes a negative electrode plate including a negative current collector provided with a negative active material layer and a positive electrode plate including a positive current collector provided with a positive active material layer. The positive active material layer includes a first region. The first region includes a second region and a third region that does not overlap the second region by any area. A first insulation layer is disposed on a surface of the second region. The negative active material layer includes a fourth region facing towards the third region. An area S2 mm.sup.2 of the second region and an area S1 mm.sup.2 of the first region satisfy: S2<S1≤1.5S2, and a ratio CB of a unit-area capacity of the fourth region to a unit-area capacity of the third region is greater than or equal to 1.1.

A packaging structure including an accommodating part and a sealing part extending from the accommodating part. The accommodating part includes a first edge, a second edge, a third edge and a fourth edge which are connected in sequence. The first edge and the third edge are opposite to each other. The second edge and the fourth edge are both connected to the first edge and the third edge. The length of the first edge is less than the length of the second edge, and the length of the first edge is less than the length of the fourth edge. The sealing part includes a first sealing edge provided along the second edge, and a second sealing edge provided along the fourth edge. A part of the first sealing edge extending beyond the first edge and a part of the second sealing edge extending beyond the first edge are respectively folded towards the first edge.

A packaging structure including an accommodating part and a sealing part extending from the accommodating part. The accommodating part includes a first edge, a second edge, a third edge and a fourth edge which are connected in sequence. The first edge and the third edge are opposite to each other. The second edge and the fourth edge are both connected to the first edge and the third edge. The length of the first edge is less than the length of the second edge, and the length of the first edge is less than the length of the fourth edge. The sealing part includes a first sealing edge provided along the second edge, and a second sealing edge provided along the fourth edge. A part of the first sealing edge extending beyond the first edge and a part of the second sealing edge extending beyond the first edge are respectively folded towards the first edge.

A button-type secondary battery including an electrode assembly having a first and second electrode tabs; a lower can having an accommodation part, in which the electrode assembly is accommodated and to which the first electrode tab is connected, and a flange part on an outer circumferential surface of the accommodation part; an upper cap on the accommodation part covering the accommodation part and a curl part on an outer circumferential surface of the cover part; a terminal member coupled to the upper cap and connected to the second electrode tab; and an insulating member configured to insulate the terminal member and the upper cap from each other and seal a gap between the terminal member and the upper cap. The flange part and the curl part are coupled to each other in a seaming manner to seal a gap between the lower can and the upper cap.

A button-type secondary battery including an electrode assembly having a first and second electrode tabs; a lower can having an accommodation part, in which the electrode assembly is accommodated and to which the first electrode tab is connected, and a flange part on an outer circumferential surface of the accommodation part; an upper cap on the accommodation part covering the accommodation part and a curl part on an outer circumferential surface of the cover part; a terminal member coupled to the upper cap and connected to the second electrode tab; and an insulating member configured to insulate the terminal member and the upper cap from each other and seal a gap between the terminal member and the upper cap. The flange part and the curl part are coupled to each other in a seaming manner to seal a gap between the lower can and the upper cap.

A battery module including: a battery stack of battery cells having opposite ends to which a plurality of electrode tabs are connected; end-side bus bar assemblies formed at opposite ends of the battery stack, respectively, and electrically connecting the electrode tabs of the battery cells; and a case accommodating the battery stack and the end-side bus bar assemblies.