20results about How to "Guaranteed Energy Density" patented technology

The invention relates to the technical field of batteries, and discloses a battery shell and a battery. The battery case includes: a case having an opening; the cover plate seals the opening to form a containing cavity, the cover plate comprises a cover plate body and a folded edge arranged on the edge of the cover plate body, the folded edge extends in the direction away from the containing cavity and is welded to the shell, a welding area is formed at the welding position of the folded edge and the shell, and in the extending direction of the folded edge, the cover plate body is located on the side, close to the containing cavity, of the welding area. In the direction perpendicular to the upper surface of the cover plate body, the distance between the side, close to the containing cavity, of the welding area and the upper surface of the cover plate body is h, the distance between the side, away from the containing cavity, of the folded edge and the side, close to the containing cavity, of the cover plate body is H, and h / H is larger than or equal to 0.17 and smaller than or equal to 0.5. The cover plate can play a buffering role, and the cover plate is prevented from being separated from the shell during thermal runaway; meanwhile, the overall height of the cover plate can be controlled, and the internal space of the shell is ensured, so that the energy density of the single battery is ensured.

The invention discloses a battery, an electrochemical device and a power utilization device.The battery comprises a battery cell, and the battery cell comprises a pole piece and a pole lug arranged on the pole piece; the lithium ion battery is characterized in that the negative electrode active material layer of the pole piece contains silicon, the percentage content of the silicon in the negative electrode active material layer is b, and the unit is%; the longest distance between the tab and the end part of the pole piece in the length direction is d, the width of the connecting position of the tab and the pole piece is m, and the units of d and m are the same; b, d and m meet the following relation: # imgabs0 #. By comprehensively controlling the value of # imgabs1 #, not only can the battery with relatively high energy density be obtained, but also the battery can be ensured to have relatively good battery fast charging performance.

The present application provides a positive electrode plate and a lithium-ion battery. The positive electrode plate includes: a current collector; a first active material layer; and a second active material layer; wherein the first active material layer is arranged between the current collector and the second active material layer, and the first active material layer and the second active material layer both include a binder, and the binder content in the first active material layer is greater than the binder content in the second active material layer. In the present application, the active material in the positive electrode plate adopts a double-layer design, and the binder content in the first active material layer is higher than the binder content in the second active material layer, which not only ensures the energy density of the lithium-ion battery, but also serves the purpose of enhancing the bonding force of the active material layer and improving the nail penetration safety performance of the lithium-ion battery.

The utility model discloses a battery device and a power utilization device, the battery device comprises a battery box body, the battery box body is provided with an accommodating space for accommodating a battery monomer, the battery box body comprises a bottom plate, the bottom plate is a metal piece, and one part of the bottom plate is bent in a direction deviating from the accommodating space; a containing groove communicated with the containing space is formed in the side, close to the containing space, of the bottom plate. And the heat exchange device comprises a heat exchange pipe, and the heat exchange pipe is arranged in the containing groove. In the technical scheme of the embodiment of the invention, the bottom plate which is a metal piece is arranged, and the heat exchange pipe is placed in the accommodating groove, so that compared with the technical scheme of adopting a cold plate for heat exchange, on the basis of ensuring the protection performance of the bottom plate on the heat exchange pipe and the battery monomer, the mounting process can be simplified, the number of parts required for mounting is reduced, and the mounting efficiency is improved. Therefore, the cost of the battery device can be reduced, and the weight of the battery device can be reduced.

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.

The utility model discloses a battery cell and a battery pack, the battery cell comprises a shell provided with a containing cavity, an electrode assembly is arranged in the containing cavity, the shell comprises two opposite first side plates, on the first side plates, a first thickening part protrudes towards the interior of the containing cavity, and the thickness of the first thickening part is larger than the thickness of an opening part and the thickness of a first body part; therefore, the shell is locally thickened, the energy density of the battery cell is ensured, and the strength of the shell is also improved; a first transition section, a thickening section and a second transition section are sequentially arranged in the first thickening part, the inner circumferential surface of the first transition section extends from the opening part to the thickening section to form a first step surface, the top cover is located on the side, away from the electrode assembly, of the first step surface, the first step surface can be used for limiting the top cover, and the connection stability between the shell and the top cover is improved; and the second transition section obliquely extends from the first body part to the thickening section to form a second step surface, so that the occupation of the internal space of the shell can be reduced, the energy density of the battery cell is improved, and the processing is convenient.

A kind of high nickel precursor, positive electrode material and preparation method thereof, belong to the technical field of lithium ion battery materials, overcome the defect that doping elements are unevenly distributed in the material body when the prior art prepares high nickel precursor. The preparation method of the high nickel precursor of the present invention comprises the following steps: step 1, prepare Al-containing nickel cobalt manganese salt solution, ammonia solution, alkali solution precipitant and ammonia bottom liquid; in the Al-containing nickel cobalt manganese salt solution, the Al / TM atomic ratio is 0.001-0.01, and TM is the sum of the amount of substance of nickel, cobalt and manganese atoms; step 2, add the ammonia bottom liquid to the reactor, and adjust the pH of the ammonia bottom liquid to 10.7-11.7, pump the Al-containing nickel cobalt manganese salt solution, ammonia solution and alkali solution precipitant into the reactor at the same time, stir during the feeding process, and continue stirring reaction after the feeding ends; step 3, solid-liquid separation, washing, drying to obtain a high nickel precursor. The present invention can reduce the generation of particle microcracks and improve the long cycle stability of the material.

The utility model provides a battery and a battery pack, and relates to the technical field of batteries. The battery comprises a shell, wherein an accommodating cavity with an opening at one end is defined by the shell; the battery cell is arranged in the accommodating cavity; the cover plate is arranged at the position of the opening in a covering mode so as to seal the containing cavity; at least one of the cover plate and the shell is provided with an active material supplementing part, the active material supplementing part is arranged close to the accommodating cavity, the active material supplementing part is provided with a filling cavity, the filling cavity is filled with a lithium supplementing agent, and the filling cavity is opened when the active material supplementing part bears preset pressure. According to the battery and the battery pack provided by the embodiment of the invention, the loss of active lithium is automatically compensated in the battery circulation process, the lithium supplementing time is ensured to be matched with the lithium consumption amount, and the lithium supplementing efficiency is improved.

The utility model relates to the technical field of batteries, and discloses a battery. The electrode assembly comprises a battery cell main body, a first tab and a second tab, the battery cell main body is a cylinder, the polarity of the first tab is opposite to that of the second tab, the battery cell main body is provided with a first end face and a second end face which are oppositely arranged, and the first tab and the second tab are arranged on the side, away from the battery cell main body, of the first end face; the outer peripheral surface of the battery cell main body is coated with the insulating film, the thickness of the insulating film is greater than or equal to 0.04 mm and less than or equal to 0.1 mm, and the ratio of the size of the insulating film to the size of the battery cell main body is greater than or equal to 0.8 and less than or equal to 1 in the axial direction of the battery cell main body; the first collector plate is at least arranged on one side, deviating from the battery cell main body, of the first tab, and is provided with a first tab welding area connected with the first tab; the second collector plate is at least arranged on one side, deviating from the battery cell main body, of the second tab, and is provided with a second tab welding area connected with the second tab. The insulating film of the battery can play a role in protecting the electrode assembly.

The invention provides a disc-type regenerative laser cavity for a laser amplifier, a disc-type laser and a laser amplification method. According to the disc-type regeneration laser cavity for the laser amplifier, the disc-type laser and the laser amplification method, laser oscillation is formed on the same disc-type crystal at the same time through two beams of laser with different spatial orientations of the main resonant cavity and the auxiliary resonant cavity, redundant pump light energy of the main cavity can be extracted by adjusting optical parameters of the auxiliary cavity, and the laser amplification efficiency is improved. The thermal pressure of the disc is reduced, and laser pulse energy of the main cavity is shaken and stripped to the auxiliary cavity, so that the laser pulse power output by the main cavity is more stable, the light beam quality is better, and the light beam directivity is more stable.

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 present invention provides a regenerated lithium iron phosphate positive electrode sheet, comprising: 70-90% of recycled waste lithium iron phosphate positive electrode material, 3-15% of lithium supplement additive, 3-10% of fast ion conductor, and 3-5% of binder; wherein the recycled waste lithium iron phosphate positive electrode material is obtained by discharging the retired power battery until the voltage is reduced to below 0.5V, crushing the disassembled and separated positive electrode sheet by physical method, adding it to a NaOH solution with a pH of 10-14, stirring, centrifugal treatment, water washing, and drying. The present invention also provides a lithium iron phosphate battery, which is obtained by pre-fabricating a lithium iron phosphate battery using the regenerated lithium iron phosphate positive electrode sheet, and then undergoing a pre-cycle repair treatment to obtain a repaired and regenerated lithium iron phosphate battery. The present invention solves the problem of recycling lithium iron phosphate positive electrode materials in power batteries, while reducing the manufacturing cost of lithium iron phosphate batteries, reliably guarantees the electrochemical performance of lithium iron phosphate batteries, and can meet the requirements of commercial energy storage lithium batteries.

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 discloses a battery pack with a charging function, and relates to the technical field of batteries. The battery pack comprises a shell, a BMS assembly, a BDU assembly, battery cells and a charging circuit, the charging circuit comprises a charging main circuit and a plurality of charging branch circuits, the shell is provided with a charging external connection end, the charging main circuit is connected to the charging external connection end, the charging branch circuits are connected to the charging main circuit in parallel, each charging branch circuit is connected with the corresponding battery cell, and the battery cells are connected to the charging main circuit. Each electricity supplementing branch line is provided with a branch switch used for controlling on-off of the branch line. And the selection controller is electrically connected with the plurality of branch switches, and the selection controller is also electrically connected with the BDU assembly. According to the battery pack with the charging function, the independent charging circuit is arranged in the battery pack, so that the low-voltage battery core in the battery pack can be independently charged through the charging circuit, and the voltage difference of the battery pack during charging and discharging is reduced.

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.

The invention relates to the technical field of batteries, and discloses a single battery and a battery pack. The single battery comprises a shell. The single battery also comprises a roll core, the roll core is arranged in the shell, and the roll core is formed by laminating and winding an electrode plate and a diaphragm. Wherein one end of the electrode plate is a winding starting end, the electrode plate comprises a first electrode plate part and a second electrode plate part which are connected, the first electrode plate part is close to the winding starting end relative to the second electrode plate part, the thickness of the first electrode plate part is greater than that of the second electrode plate part, and the flattened electrode plate has a length direction; and in the flattened state, the size of the first pole piece part in the length direction is smaller than that of the second pole piece part in the length direction. Through the mode, the stress borne by the ring layer close to the interior of the roll core can be reduced, and the energy density of the single battery can be guaranteed.

The utility model provides a kind of roll core and battery, at least one first embossed area is equipped on the positive sheet of arc region, each first embossed area includes at least one first embossed groove;At least one second embossed area is equipped on the negative sheet of arc region, each second embossed area includes at least one second embossed groove;Each first embossed groove is correspondingly arranged with a second embossed groove;The opening direction of each first embossed groove is same with the opening direction of its corresponding second embossed groove, and electrolyte flow channel exists between the two, improve the accuracy of the sheet embossing of roll core arc region, can ensure that electrolyte flow channel exists between each first embossed groove and its corresponding second embossed groove, can realize increasing electrolyte flow channel, avoid limiting the flowability of electrolyte, effectively improve the lithium precipitation situation of roll core arc region, maintain roll core energy density.

The battery pack comprises a box body and a cylindrical battery pack located in the box body, the box body comprises a bottom plate, the cylindrical battery pack comprises at least two cylindrical batteries, the axial directions of the cylindrical batteries are parallel to the bottom plate, a heat exchange plate is perpendicular to the bottom plate, and the heat exchange plate is located at the axial ends of the cylindrical batteries and adheres to the cylindrical batteries through adhesive layers; in the direction perpendicular to the bottom plate, at least one end area of the side face, facing the cylindrical battery, of the heat exchange plate is provided with a first blocking piece, the proportion of the width of the first blocking piece in the direction perpendicular to the bottom plate to the width of the heat exchange plate is m, the axial length of the cylindrical battery is l, and m * l is larger than or equal to 2.4 mm and smaller than or equal to 4 mm. According to the battery pack, the first blocking piece is arranged to prevent glue from overflowing, the value of m * l is controlled to be 2.4 mm-4mm, the fixing strength of the cylindrical battery and the heat exchange plate can be guaranteed, and meanwhile the heat exchange effect of the cylindrical battery and the heat exchange plate, the glue blocking effect of the first blocking piece and the energy density of the whole battery pack can be guaranteed.