50results about How to "Guaranteed Energy Density" patented technology

The invention provides a regenerated lithium iron phosphate positive pole piece. The regenerated lithium iron phosphate positive pole piece comprises 70-90% of a recycled waste lithium iron phosphate positive pole material, 3-15% of a lithium supplement additive, 3-10% of a fast ion conductor and 3-5% of a binder, wherein the recycled waste lithium iron phosphate positive electrode material is obtained by discharging a decommissioned power battery until the voltage is reduced to 0.5 V or below, crushing a disassembled and separated positive electrode plate by adopting a physical method, adding the crushed positive electrode plate into a NaOH solution with the pH value of 10-14, stirring, centrifuging, washing and drying. The invention also provides a lithium iron phosphate battery which is a repaired and regenerated lithium iron phosphate battery prepared by prefabricating the lithium iron phosphate battery with the regenerated lithium iron phosphate positive pole piece and then carrying out pre-cycle repair treatment. According to the method, the problem of recycling the lithium iron phosphate positive electrode material in the power battery is solved, the electrochemical performance of the lithium iron phosphate battery is reliably ensured while the manufacturing cost of the lithium iron phosphate battery is reduced, and the requirements of commercial energy storage lithium batteries can be met.

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 provides a thermal management assembly, a thermal management system and a battery. The heat management assembly comprises a plurality of heat management parts, one heat management part is a first heat management part, and the other heat management parts are second heat management parts; the area of at least part of the overflowing cross section of the main flow channel of the first heat management part is smaller than that of the overflowing cross section of the main flow channel of the second heat management part. According to the application, the flow of the heat exchange medium in the first heat management part can be reduced, and the flow in the second heat management part can be increased, so that the consistency of the heat management efficiency of the isolated zero battery cell column and the heat management efficiency of the grouped battery cell column can be improved. Therefore, on the basis of ensuring the energy density of the battery and ensuring that each battery cell column is provided with the thermal management part, the uniformity of the thermal management assembly on the temperature management of the battery cells can be improved, so that the consistency of the grouped battery cell columns and the isolated zero battery cell columns in the aspects of charging and discharging, battery capacity attenuation, mechanical stress and the like is improved. Finally, the reliability of the battery can be improved.

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 invention discloses a dispersing agent and a preparation method and application thereof, negative electrode slurry and a preparation method thereof, a negative electrode plate and an electrochemical device. On one hand, by reducing the chain length of the sodium carboxymethyl cellulose polymer, the crystallinity of the sodium carboxymethyl cellulose polymer is reduced, the rigidity of the sodium carboxymethyl cellulose polymer is reduced, the problem of cracking of the negative electrode slurry in the high-speed thick coating process is solved, the energy density of the battery is improved, and the efficiency of the battery is improved. On the other hand, the copolymer is obtained by polymerizing unsaturated bond-containing carbon chain groups on part of hydroxyl groups of the sodium carboxymethyl cellulose polymer, so that the copolymer has a plurality of branches, and the branches provide flexible chain segments for the sodium carboxymethyl cellulose polymer and reduce the rigidity of the sodium carboxymethyl cellulose polymer; and thus, the problem of cracking of the negative electrode slurry in the high-speed thick coating process is solved, the energy density of the battery is improved, and the efficiency of the battery is improved.

The invention relates to a pole piece structure, a pole piece manufacturing control system, a control method and a battery cell. A base material in the pole piece structure is provided with a tab area, a first cutting area and a second cutting area; the tab area is positioned between the first cutting area and the second cutting area; the slurry layer is divided into a first slurry layer and a second slurry layer, and the first slurry layer is arranged between the first cutting area and the tab area and between the second cutting area and the tab area; the first sizing agent layer is arranged in the first cutting area, the second sizing agent layer is arranged in the first cutting area and the second cutting area, and the thickness of the first sizing agent layer is larger than that of the second sizing agent layer, so that sizing agents in the first cutting area and the second cutting area are thin, and then groove shapes are formed in the first cutting area and the second cutting area respectively. The energy density of the battery is ensured, the stress is uniform during cutting, the cutting surface is flat, short circuit or battery combustion in the battery caused by large-particle falling and burrs at the cutting position is avoided, and the safety and the reliability of the battery are improved.

A battery comprises a negative electrode active material layer, a positive electrode active material layer and a separator between the positive electrode active material layer and the negative electrode active material layer. The negative electrode active material layer comprises a first part and a second part. The second part comprises a first surface and a first end. The first surface is connected to the first part through a first connection, and the first end is away from the first connection and is one end of the negative electrode active material layer. The thickness of the second part decreases from the first connection toward the first end. The positive electrode active material layer comprises a third part and a fourth part, and the fourth part comprises a second surface and a second end. The second surface is at least partially opposite to the second surface, and is connected to the third part through a second connection, and the second end is away from the second connection and is one end of the positive electrode active material layer. The thickness of the fourth part gradually decreases from the second connection toward the second end. The first connection is located between the second connection and the second end. The battery of the present application is conducive to suppressing lithium precipitation while maintaining the energy density of the battery.

The utility model discloses a pole piece and a battery cell, the pole piece is used for a winding type battery cell, and the pole piece comprises a current collector and a colloid part. The current collector comprises a first empty foil area and a coating area, an active material layer is arranged on the coating area, and a first through hole is formed in the first empty foil area in the thickness direction of the current collector. And the colloid part is arranged in the first through hole. The current collector comprises an inner end part and an outer end part along the length direction of the current collector, the first empty foil area is arranged at the outer end part, and when the current collector is in a winding state, the inner end part is arranged at the inner ring of the current collector, and the outer end part is arranged at the outer ring of the current collector. According to the battery, the first empty foil area is arranged at the outer end part, and the first empty foil area comprises the colloid part, so that under the conditions that the thickness of the battery is not increased and the energy density of the battery is not changed, a connecting force is provided through the colloid part, and the coiled battery core is connected.

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 cell and a battery. The battery cell comprises a main body, at least one side of the main body along a first direction is provided with a tab side for arranging a tab, an accommodating groove is formed in the tab side and extends to the outer surface of the main body in a second direction, the second direction intersects with the first direction, and the accommodating groove is used for accommodating at least one part of the tab. The accommodating groove formed in the main body can provide an accommodating space for the tab when the tab is bent, so that one part of the tab is positioned in the accommodating groove, the probability that the tab protrudes out of the outer surface in the second direction of the main body after being bent is reduced, and the subsequent assembly and energy density of the battery cell are ensured.

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.

A battery includes a negative electrode active material layer, a positive electrode active material layer and a separator. The positive electrode active material layer includes a first part and a second part connected to the first part along a first direction. The second part includes a first end, and the first part includes a first surface. The first surface is connected to the second part through a first connection, the first end is away from the first connection and is an end of the positive electrode active material layer, and the thickness of the second part in a second direction perpendicular to the first direction decreases from the first connection toward the first end along the first direction. The negative electrode active material layer includes a third part and a second end located on one side of the third part along the first direction, and the third part includes a second surface at least partially facing the first surface. The first layer adheres to the first end, the second part and the first surface, and continuously covers the first end, the second part and part of the first surface. The first layer can block the conduction of ions. The battery is conducive to suppressing lithium precipitation while maintaining the battery energy density.

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 positive electrode plate and a preparation method thereof and a lithium-ion battery, wherein the positive electrode plate comprises a current collector and a composite positive electrode active coating disposed on at least one side of the current collector; the composite positive electrode active coating comprises a first active coating and a second active coating, wherein the first active coating is disposed on the surface of the current collector, and the second active coating is disposed on the surface of the first active coating away from the current collector; the first active coating comprises a first cobalt-containing positive electrode material and a second cobalt-containing positive electrode material, wherein the first cobalt-containing positive electrode material and the second cobalt-containing positive electrode material have different cobalt contents and particle sizes; the second active coating comprises a third cobalt-containing positive electrode material and a fourth cobalt-containing positive electrode material, wherein the third cobalt-containing positive electrode material and the fourth cobalt-containing positive electrode material have different cobalt contents and particle sizes. The present invention can reduce the cost of positive electrode materials while ensuring energy density and can improve battery performance by combining four cobalt-containing positive electrode materials.

The invention belongs to the technical field of new energy, and particularly relates to a positive pole piece, a lithium ion battery and electric equipment. The positive pole piece provided by the invention comprises a positive current collector, and at least one side surface of the positive current collector comprises a first active layer, a fast ion conductor layer, a lithium supplementing layer and a second active layer which are arranged in sequence. In the application, the inner layer area of the pole piece is coated with the fast ion conductor layer as a solid electrolyte, so that the fast ion conductor layer plays a role of an ion conductor, lithium ions are effectively released, and the problems of poor infiltration of electrolyte in the pole piece, difficult de-intercalation of the lithium ions and the like are avoided; meanwhile, the fast ion conductor layer needs to consume a small amount of lithium ions, so that the fast ion conductor layer is coated with the lithium supplementing layer to reduce the active lithium loss of the fast ion conductor layer, and the redundant lithium ions of the lithium supplementing layer can be used for supplementing the lithium ion consumption in the later period of circulation to avoid the problems of circulation diving, lithium separation and the like of the lithium ion battery; the arrangement of the double active layers can ensure the energy density.

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 invention belongs to the technical field of battery materials, and particularly relates to a hydrophobic polymer coated sodium electric material as well as a preparation method and application thereof. The invention provides a hydrophobic polymer coated sodium electric material, which comprises a coating layer and a sodium electric material matrix, the coating layer coats the sodium electric material matrix, and the coating layer comprises hydrophobic polymer and conductive carbon. According to the hydrophobic polymer coated sodium-ion battery material provided by the invention, the air stability and the energy density of a sodium-ion battery are improved on the basis of not changing the structure of the sodium-ion battery material.

The present invention relates to the field of battery technology, and discloses a battery shell and a battery. The battery shell includes: a shell having an opening; a cover plate, sealing the opening to form a receiving cavity, the cover plate including a cover plate body and a folded edge arranged at the edge of the cover plate body, the folded edge extends in a direction away from the receiving cavity, the folded edge is welded to the shell, and the welded portion of the folded edge and the shell forms a welding area, in the extending direction of the folded edge, the cover plate body is located on the side of the welding area close to the receiving cavity, in the direction perpendicular to the upper surface of the cover plate body, the side of the welding area close to the receiving cavity is at a distance h from the upper surface of the cover plate body, and the distance from the side of the folded edge away from the receiving cavity to the side of the cover plate body close to the receiving cavity is H, 0.17≤h / H≤0.5. It can not only ensure that the cover plate can play a buffering role to prevent the cover plate from being separated from the shell during thermal runaway; at the same time, it can control the overall height of the cover plate to ensure the internal space of the shell, thereby ensuring the energy density of the single battery.

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 present invention discloses a battery capacity recovery method, device, equipment, storage medium and program product. The battery includes a silicon negative electrode lithium ion battery, and the negative electrode material of the silicon negative electrode lithium ion battery includes a silicon-based negative electrode material. The battery capacity recovery method includes: performing shallow charge and shallow discharge operations on the silicon negative electrode lithium ion battery for a preset number of cycles; wherein, during the shallow charge and shallow discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than the delithiation potential of the silicon-based material in the silicon-based negative electrode material; monitoring the battery capacity of the silicon negative electrode lithium ion battery during the shallow charge and shallow discharge operations; when the battery capacity of the silicon negative electrode lithium ion battery during the shallow charge and shallow discharge operations is between 75% and 95% of the rated capacity of the battery, a full charge and discharge operation is performed on the silicon negative electrode lithium ion battery; during the full charge and discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material. The technical solution provided by the embodiment of the present invention effectively recovers the battery capacity.