Aspects of the present disclosure involve various battery can designs. In general, the battery can design includes two fitted surfaces oriented opposite each other and seam welded together to form an enclosure in which a battery stack is located. To form the enclosure, the two fitted surfaces are welded together along the large perimeter. Other swelling-resisting advantages may also be achieved utilizing the battery can design described herein including, but not limited to, the ability to modify one or more can wall thicknesses to control a pressure applied to the battery stack by the can, overall reduction in wall thickness of the can through the use of stronger materials for the can surfaces, additional supports structures included within the can design, and/or bossing or other localized thinning of surfaces of the can.

The present disclosure discloses a top cover assembly of battery and top cover assembly, the top cover assembly comprising: a top cover having first recess on top surface, the first recess is provided around mounting hole; a terminal post penetrating mounting hole, first end of terminal post is limited to a side of top cover on which a bottom surface is located, second end of terminal post is higher than top surface of top cover; an upper plastic member provided on a side of top cover where top surface thereof is located and surrounding second end of terminal post to be connected to second end of the terminal post, the upper plastic member has a first boss on a bottom surface, the first boss is accommodated in the first recess, the bottom surface of the upper plastic member is connected to the top surface of the top cover.

The present disclosure discloses a top cover assembly of battery and top cover assembly, the top cover assembly comprising: a top cover having first recess on top surface, the first recess is provided around mounting hole; a terminal post penetrating mounting hole, first end of terminal post is limited to a side of top cover on which a bottom surface is located, second end of terminal post is higher than top surface of top cover; an upper plastic member provided on a side of top cover where top surface thereof is located and surrounding second end of terminal post to be connected to second end of the terminal post, the upper plastic member has a first boss on a bottom surface, the first boss is accommodated in the first recess, the bottom surface of the upper plastic member is connected to the top surface of the top cover.

The present disclosure discloses a cover body assembly of a battery and a battery. The battery includes a housing provided with an opening; a cover body assembly used for closing the opening; and a jelly-roll arranged inside an inner cavity of the housing; a liquid injection channel is arranged on the cover body assembly; electrolyte is injected into the inner cavity of the housing through the liquid injection channel, thus soaking the jelly-roll; the cover body assembly includes a cover body; and a lower insulation plate which is connected to a bottom surface of the cover body and is disposed at an interval, thus forming a distribution channel between the lower insulation plate and the cover body; and the distribution channel is communicated to the liquid injection channel and the inner cavity of the housing.

The present disclosure discloses a cover body assembly of a battery and a battery. The battery includes a housing provided with an opening; a cover body assembly used for closing the opening; and a jelly-roll arranged inside an inner cavity of the housing; a liquid injection channel is arranged on the cover body assembly; electrolyte is injected into the inner cavity of the housing through the liquid injection channel, thus soaking the jelly-roll; the cover body assembly includes a cover body; and a lower insulation plate which is connected to a bottom surface of the cover body and is disposed at an interval, thus forming a distribution channel between the lower insulation plate and the cover body; and the distribution channel is communicated to the liquid injection channel and the inner cavity of the housing.

A battery cell may include an electrode assembly, a housing and an end cap. The electrode assembly may have a first tab. The housing may have an opening for receiving the electrode assembly. The end cap may include a cap body and a first convex part. The end cap may be provided with a liquid injection hole, and the liquid injection hole may be located inside of the outer peripheral surface of the first convex part. The first convex part may be provided with a flow guiding channel, the flow guiding channel may communicate with the liquid injection hole and penetrate the outer peripheral surface, and the flow guiding channel may be used for allowing at least part of the electrolyte solution to flow to outside of the outer peripheral surface.

A battery cell may include an electrode assembly, a housing and an end cap. The electrode assembly may have a first tab. The housing may have an opening for receiving the electrode assembly. The end cap may include a cap body and a first convex part. The end cap may be provided with a liquid injection hole, and the liquid injection hole may be located inside of the outer peripheral surface of the first convex part. The first convex part may be provided with a flow guiding channel, the flow guiding channel may communicate with the liquid injection hole and penetrate the outer peripheral surface, and the flow guiding channel may be used for allowing at least part of the electrolyte solution to flow to outside of the outer peripheral surface.

An electricity storage module according to the present invention is provided with: a plurality of arranged cylindrical electricity storage devices; and an upper holder which holds the upper end parts of the plurality of electricity storage devices, while being provided with a plurality of containing parts that is formed of a thermoplastic resin. The upper holder comprises an upper support member which is formed of a thermosetting resin and supports electricity storage devices adjacent to each other, while being positioned between the adjacent electricity storage devices. In comparison to the thermoplastic resin, the thermosetting resin is not susceptible to deformation or melting event if heat is applied thereto.

An electricity storage module according to the present invention is provided with: a plurality of arranged cylindrical electricity storage devices; and an upper holder which holds the upper end parts of the plurality of electricity storage devices, while being provided with a plurality of containing parts that is formed of a thermoplastic resin. The upper holder comprises an upper support member which is formed of a thermosetting resin and supports electricity storage devices adjacent to each other, while being positioned between the adjacent electricity storage devices. In comparison to the thermoplastic resin, the thermosetting resin is not susceptible to deformation or melting event if heat is applied thereto.

A secondary battery according to one embodiment of the present disclosure includes an electrode assembly impregnated with an electrolyte solution; a battery case that houses the electrode assembly and the electrolyte solution; a cap assembly coupled to the battery case; and a gasket positioned between the battery case and the cap assembly, wherein the gasket includes an indented part formed on the inside, and wherein the indented part is spaced apart from the cap assembly while facing the cap assembly.