6results about How to "Guaranteed Energy Density" patented technology

This invention relates to a lithium-ion battery and an electrical device. The positive electrode active material layer of the lithium-ion battery includes a first coating and a second coating sequentially disposed outwards along the surface of the positive electrode current collector. The first coating comprises lithium iron phosphate, and the second coating comprises lithium manganese iron phosphate. The melting point T of the positive electrode current collector is... m The ratio of the particle size Dv50 of the first coating to the particle size of the negative electrode material is denoted as A, the thickness of the first coating is denoted as B, and the particle size Dn50 of the lithium manganese iron phosphate in the second coating is denoted as C, ranging from 1.2 to 7.7 μm. 3 / ℃. In the lithium-ion battery provided by this invention, a double-layer coating technology is used to improve the positive electrode sheet. A first coating containing lithium iron phosphate is set on the side close to the surface of the positive electrode current collector, giving full play to its advantages of high safety and low risk of fire and explosion; a second coating containing lithium manganese iron phosphate is set on the side away from the positive electrode current collector, which can ensure the energy density of the battery and coordinate the value of the coating to achieve synergistic optimization of safety and energy density.

This application provides a cover plate assembly, a combined battery cell, and a battery pack. The cover plate assembly includes two integrated cover plate bodies, each comprising a cover plate, a connecting ring, a terminal post, and an insulation sealing assembly. The cover plate has a terminal post hole with a limiting step surface. The connecting ring is located in the terminal post hole and fixedly connected to the cover plate. The connecting ring includes a ring body and a ring flange. The outer radial side of the ring body has a first step surface, and the inner radial side has a second step surface. The first step surface and the limiting step surface provide limiting engagement. The terminal post passes through the connecting ring and includes a post body and a limiting ring protrusion. The second step surface forms a limiting engagement with the limiting ring protrusion. The insulation sealing assembly is distributed between the terminal post and the connecting ring, and the ring flange is pressed onto the insulation sealing assembly. The two integrated cover plate bodies have terminal posts with opposite polarities and are integrally formed as composite terminal posts. This solves the problem in the prior art of how to provide a way to improve the overall energy density of the battery pack and reduce costs in the battery cell assembly process.

The utility model provides a kind of battery assembly and energy storage device with it, wherein, battery assembly includes: bottom plate;Multiple battery cell groups, set on bottom plate, each battery cell group includes multiple battery cell structures arranged in stack;First end plate and second end plate, set on bottom plate, first end plate and second end plate respectively abutment set in both ends of multiple battery cell groups;Top limit piece, with first end plate and second end plate are connected and set in the top of multiple battery cell groups, and top limit piece is abutment matched with the top of multiple battery cell groups.The technical scheme of the application can effectively solve the problem of low production efficiency of battery assembly in related technology.

The utility model relates to battery technical field discloses a kind of winding type electric core and battery, winding type electric core has straightaway and circular arc area, winding type electric core includes polar plate and diaphragm of laminated and winding arrangement;Polar plate includes current collector and active layer, active layer is located at the at least one side of current collector, active layer includes circular arc segment and straightaway, circular arc segment is located in circular arc area, straightaway is located in straightaway, and circular arc segment is equipped with positioning groove;Winding type electric core further includes ion-conducting membrane, at least part of ion-conducting membrane is located in positioning groove, and ion-conducting membrane is arranged between polar plate and diaphragm.The utility model of winding type electric core is by being provided with positioning groove on polar plate, the relative position of ion-conducting membrane and polar plate is limited, so that ion-conducting membrane can continuously insulate the burr of the part of polar plate located in circular arc area, reduce the probability of battery self-discharge.

This utility model discloses a battery casing with stress grooves, comprising: a casing body, wherein at least one stress groove is provided at the upper end of the casing body, the depth of the stress groove is 0.03-0.7 mm, and the stress groove forms a gap with the edge of the casing body. This utility model also provides a battery. By stamping stress grooves on square or irregularly shaped casings or covers, these stress grooves (which can be recesses or protrusions) enhance the battery's resistance to deformation and improve its thermal management performance. This maintains the battery's energy density while enhancing structural reliability, buffering thermal expansion stress distribution, ensuring surface flatness, and mitigating dynamic deformation. Furthermore, the presence of stress grooves increases the contact area between the battery surface and the external environment, improving thermal conductivity.

The utility model provides a kind of cylindrical lithium ion battery, including positive current collector and roll core, wherein, disc body is equipped on positive current collector, disc body and the full tab end surface of roll core are welded fixed;The radius of roll core is R0, and the shortest distance of disc body edge to roll core edge is L4, and the radius of roll core and the shortest distance of disc body edge to roll core edge satisfy: L4 / R0=8.6~12.6%.The cylindrical lithium ion battery passes through the proportion range of radius of roll core and the shortest distance of disc body edge to roll core edge by reasonable setting, can both ensure in shell wall to the deformation of axis center, also cannot easily contact the disc body edge of positive current collector, effectively reduce short-circuit risk;It can also ensure that disc body and roll core have enough weldable area, maintain the overcurrent capacity of welding wire, avoid that welding wire place temperature rises too high, to guarantee the safety and performance of battery.