45results about How to "Increase fluid retention" patented technology

The invention discloses a lithium battery diaphragm and a preparation method and application thereof, the lithium battery diaphragm comprises a base membrane and a coating on the base membrane, and the coating comprises gamma-phase superfine porous alumina. The method for preparing the lithium battery diaphragm comprises the steps that a base membrane is coated with slurry, drying is conducted, a coating is obtained on the base membrane, the lithium battery diaphragm is obtained, and the slurry comprises water, gamma-phase superfine porous aluminum oxide, an adhesive and a dispersing agent. The gamma-phase superfine porous aluminum oxide has a rich powder pore structure, so that the weight of the diaphragm is reduced, and the lithium battery diaphragm disclosed by the invention has high ion conductivity and high wettability while having high temperature resistance. The high-safety lithium ion battery diaphragm is an important way for improving the safety and the cycling stability of a lithium battery.

The invention provides a negative electrode plate. The negative electrode plate comprises a negative electrode current collector, a graphite negative electrode material layer positioned on the surface of the negative electrode current collector, and a mixed coating of graphite and polymer particles positioned on the surface of the graphite negative electrode material layer, the graphite negative electrode material layer comprises graphite, the mixed coating comprises graphite and polymer particles, and the average particle size D1 of the graphite in the graphite negative electrode material layer and the average particle size D3 of the polymer particles are both larger than the average particle size D2 of the graphite in the mixed coating. The glass transition temperature Tg of the polymer particles is 60 DEG C or below, the polymer modulus is 250-400 MPa, and the swelling degree in an electrolyte is 10-30%. The negative plate provided by the invention can form stable bonding with the diaphragm in the hot pressing process, and the bonding force is improved by more than one time; when the negative plate is applied to the lithium ion secondary battery, the cycle life of a battery cell can be effectively prolonged by more than 20%, and lithium is not separated out during charging.

The invention relates to the technical field of lithium batteries, and provides a winding type lithium ion battery. According to the winding type lithium ion battery, in a single-sided area of a negative plate at the central position of a winding core, a plurality of concave parts are arranged on one side surface, not provided with a negative electrode active layer, of a negative electrode current collector, and projections of the head end of a first negative electrode active layer and the head end of a second negative electrode active layer in different bending areas in the thickness direction of the winding core are overlapped; the concave part and the projection of the negative electrode active layer are overlapped and act together, so that the liquid retention capacity of the center of the roll core can be obviously improved, the wettability of electrolyte is improved, the cycle performance of the battery is further improved, and lithium precipitation is reduced.

The invention discloses a negative plate, a lithium ion battery and electric equipment. The negative plate comprises the negative plate, the lithium ion battery and the electric equipment. The negative plate comprises a negative current collector and a negative active material layer located on at least one side of the negative current collector, the negative active material layer comprises a negative active material, and the negative active material comprises a graphite material, a hard carbon material and a silicon-based material; the particle size D50 of the graphite material, the particle size D '50 of the hard carbon material and the particle size D' '50 of the silicon-based material meet the conditions that 1.5 < = D50 / D' 50 < = 2.5 and 1.1 < = D '50 / D' '50 < = 3. According to the scheme, through the matching of the sizes and the particle sizes of the graphite, the hard carbon and the silicon-based material, the short plate of low compaction density of the hard carbon is effectively improved, the overall compaction density of the negative pole piece is improved, the energy density of the battery is favorably improved, the infiltration of electrolyte is facilitated, the liquid retention of the pole piece is improved, the rapid embedding of lithium ions is also facilitated, and the rate capability is improved.

The invention discloses a composite diaphragm as well as preparation and application thereof in a lithium ion battery, and belongs to the technical field of lithium ion battery materials. The composite diaphragm comprises a base material, at least one ceramic coating and at least one organic polymer coating, wherein the surface of the base material is coated with the at least one ceramic coating and the at least one organic polymer coating. The thickness of the ceramic coating is 1-3 m, and the thickness of the organic polymer coating is 0.3-5 m. And the ceramic coating is prepared by adopting a water-based coating process, so that the heat resistance and electrolyte wettability of the diaphragm can be improved. The organic polymer coating is prepared in an electrostatic spinning mode, and a spherical bead structure is formed by adjusting spinning parameters. Due to the fact that a large number of bead structures are contained, the prepared composite diaphragm shows stable super-hydrophobic performance. And the organic polymer has extremely high heat resistance and cohesiveness to a pole piece, and the diaphragm is endowed with extremely high porosity by the electrostatic spinning preparation process.

The invention provides a battery diaphragm, a preparation method thereof and a battery. The first coating comprises a composite material, and the composite material comprises nano cellulose and a metal organic framework. According to the battery diaphragm provided by the invention, through the synergistic matching effect of the composite material in the first coating, the probability of thermal runaway is greatly reduced, the infiltration time is shortened, the liquid absorption rate is improved, the migration number of lithium ions is increased, and the migration rate of the lithium ions is improved; therefore, the safety performance, the dynamic performance and the cycle performance of the battery are obviously improved.

The invention relates to the technical field of lithium batteries, and discloses a negative plate, a preparation method thereof and a lithium battery. The negative plate comprises a current collector and an active layer arranged on the surface of the current collector; the active layer comprises a negative electrode active material, a conductive agent, an adhesive and an additive; the additive is a metal oxide with an inverse opal structure. The metal oxide with the inverse opal structure is added into the active layer of the negative electrode plate, and the metal oxide can endow the negative electrode plate with a special pore structure, so that the porosity of the negative electrode plate is improved, the wettability of an electrolyte to the negative electrode plate is improved, and the liquid retention capacity of the negative electrode plate is improved.

The invention provides a thick electrode plate without residual multi-step holes, a preparation method of the thick electrode plate and a lithium ion battery. According to the preparation method, the current collector is obtained; sequentially carrying out n times of coating operation on the slurry; the slurry for the first coating operation does not contain ammonium bicarbonate solid particles; slurry from the second coating operation to the nth coating operation contains ammonium bicarbonate solid particles, and the use amount of the ammonium bicarbonate solid particles used in each coating operation is increased along with the increase of the coating operation times; and sequentially carrying out drying operation and rolling operation on the slurry after each coating operation, so that the ammonium bicarbonate solid particles are gasified during drying, and the obtained non-residue multi-stepped-hole thick electrode plate forms a down-gradient-difference porous structure. According to the preparation method, the characteristic that the ammonium bicarbonate solid particles are easy to decompose at low temperature and free of residues is utilized, on the premise that it is guaranteed that the porous structure along the gradient difference is prepared, the phenomenon that the coating is prone to cracking in the drying process is avoided, and drying energy consumption is reduced.

The invention relates to a negative electrode material and a preparation method thereof, and a lithium ion battery, the negative electrode material comprises a porous carbonaceous material and a silicon material, the negative electrode material has a first region located in the central region in the porous carbonaceous material, a second region distributed on the surface of the first region, and a third region distributed on the surface of the second region, the porous carbonaceous material located in the first area has first pores, the porous carbonaceous material located in the second area has second pores, the porous carbonaceous material located in the third area has third pores, at least part of the first pores are communicated with the second pores, at least part of the second pores are communicated with the third pores, and the third pores are communicated with the third pores. At least part of the third pores are communicated with the surface of the negative electrode material, the silicon material is distributed in at least one of the first pores, the second pores and the third pores, the pore diameter of the first pores is 0.1-2.2 nm, the pore diameter of the second pores is 1.8-5 nm, the pore diameter of the third pores is 3-60 nm, and the probability entropy H of the pores in the porous carbonaceous material meets 0.96 gt; hgt; and 0.70%.

The invention discloses a ceramic modified lithium battery diaphragm and a preparation method thereof, the ceramic modified lithium battery diaphragm comprises a base membrane and a coating on the base membrane, and the coating comprises ceramic powder, modified resin, nano cellulose crystals and a coating agent. The modified resin is epoxy resin, and the coating agent is N-phenylmaleimide. The preparation method comprises the following steps: firstly, coating a base membrane with slurry containing ceramic powder and modified resin, and then carrying out secondary coating by adopting a coating solution, so as to obtain the ceramic modified lithium battery diaphragm which takes the ceramic powder as a substrate, and the modified resin and the coating agent in the coating solution are crosslinked into a net structure to be attached to the substrate. The heat-resistant effect, the infiltration capacity and the liquid retention rate of the diaphragm can be effectively improved.

The invention provides an electrode plate and a battery comprising the same. The electrode plate comprises an electrode current collector; the active material layer comprises a first active material layer located on the first surface of the current collector; the heat conduction layer comprises a first heat conduction layer located in a first empty foil area of the current collector, and the first empty foil area is an area, where the first active material layer is not arranged, of the first surface of the current collector; the first heat conduction layer comprises a heat conduction impedance carbon material, the heat conductivity coefficient of the first heat conduction layer is larger than or equal to 3 W / (mK), and the powder resistivity of the first heat conduction layer is larger than or equal to 0.2 omega cm. The heat conduction layer is arranged in the empty foil area, without the active material layer, of the current collector, the heat conduction layer comprises the heat conduction impedance carbon material, heat generated by the battery under the high-temperature working condition or the high-rate charging and discharging condition can be conducted out in time, the problem of gas generation caused by catalysis of electrolyte is avoided, and the service life of the battery is prolonged. Therefore, the safety performance and the electrical performance of the battery are improved.

The invention discloses modified porous alumina as well as a preparation method and application thereof, and belongs to the technical field of diaphragm materials. The modified porous alumina comprises porous alumina and a modification additive, the modification additive comprises at least one of pyridine, imidazole, indole, quinoline and morpholine; the mass ratio of the porous aluminum oxide to the modification additive is (100: 1)-(100: 40); the particle size of the porous alumina is 0.1 mu m-2 mu m, the pore volume is 0.01 cm < 3 > / g-0. 1 cm < 3 > / g, and the pore diameter is 3 nm-50 nm. The particle size of the porous alumina in the modified porous alumina is small, so that the arrangement of a thin coating of the diaphragm can be realized; the porous aluminum oxide has specific pore volume and pore diameter, so that the liquid retention property and the ionic conductivity of the diaphragm are improved; in addition, the porous aluminum oxide is also loaded with a modification additive, so that the wettability can be improved, HF free in the electrolyte can be effectively captured, and the reliability and safety of the lithium ion battery are improved.

The invention discloses a preparation method of a square lithium iron phosphate battery capable of improving cycle performance and the square lithium iron phosphate battery, a diaphragm is a polyethylene coated ceramic layer diaphragm, double surfaces of the diaphragm are coated with ceramic layers, the total thickness of the ceramic layers is 1-3 microns, the ceramic layers can improve the liquid retention capacity and contribute to improving the cycle capacity, and the ceramic layers are too thick, so that the cycle performance of the lithium iron phosphate battery is improved. The system energy density is reduced. The process is simplified, and mass production control is easy; the cycle performance is improved, the cycle attenuation trend is reduced, and the user experience is improved.

The invention discloses a gel-resistant positive electrode slurry and porous electrode preparation. The positive electrode slurry in the invention gels slowly, and the surface and the inside of the electrode after drying have pores, which are helpful to increase the electrode liquid retention, improve the rate performance of the battery core, and reduce the polarization of the electrode. The invention uses glycolic acid, acetic acid, anhydrous oxalic acid, and anhydrous citric acid as pore formers. The pore formers are added after part of the organic solvent has been added to the stirring tank, which can avoid the corrosion of the tank body by the acidic pore former. The pore former can be miscible with N-methylpyrrolidone to ensure the uniformity of the dispersion of the pore former in the slurry. By controlling the drying temperature of the electrode, controlling the volatilization speed of glycolic acid and acetic acid and the decomposition speed of anhydrous oxalic acid and anhydrous citric acid, the porosity of the electrode is improved, and the structure of the electrode is ensured not to be destroyed. The pore former used in the present invention is a weakly acidic substance, which can neutralize the residual alkali on the surface of the positive electrode material, adjust the pH of the slurry, and has the effect of alleviating the gelation of the slurry.

The present application relates to the technical field of battery, in particular to a kind of graphite material and its preparation method and application.The present application provides a kind of graphite material, the graphite material includes graphite body, the graphite body has multiple through-hole structures, the hole diameter R of each through-hole structure is 0.07~1.81 μm;The particle size Dv50 of the graphite material and the hole diameter R of the through-hole structure satisfy:3.9≤Dv50 / R≤107.1.The graphite material of the present application has abundant through-hole structure, provides more channels for lithium ion deintercalation, and shortens the solid-phase diffusion path of lithium ion intercalation, so as to improve the rate performance of graphite negative electrode material, and the through-hole channel structure can improve the wettability and liquid retention of electrolyte, thereby improving the cycle performance of battery.

The application relates to the technical field of batteries, and discloses a pole piece, a battery cell and a battery. The pole piece comprises a current collector, a first active material layer and a second active material layer. In the thickness direction, the current collector comprises opposite first and second sides. The second side comprises a first empty foil area and a second empty foil area. In the length direction of the current collector, the first empty foil area and the second empty foil area are arranged in sequence, and the second empty foil area is arranged at one end of the second side. The first active material layer is coated on the first side. The second active material layer is coated on the first empty foil area. A liquid retention coating is coated on the second empty foil area. The battery cell comprises a separator, a positive pole piece and a negative pole piece. At least one of the positive pole piece and the negative pole piece adopts the pole piece. The separator is arranged between the positive pole piece and the negative pole piece. The battery comprises an aluminum plastic film and the battery cell. The pole piece, the battery cell and the battery can improve the liquid retention amount of the battery, thereby improving the cycle performance of the battery.

The utility model belongs to the technical field of batteries, and particularly relates to a composite isolating membrane structure, a battery cell and a battery, the composite isolating membrane structure comprises a base membrane and at least two coating composite layers; the coating composite layer is arranged on the surface of at least one side of the base film; the coating composite layer comprises a coating sub-layer and a convex sub-layer which are arranged in a laminated manner; the protrusions are connected to the base film in a layered mode. A blank concave area is arranged between every two adjacent protruding layers. According to the composite isolating membrane structure, the liquid retention capacity of a battery cell corresponding to the composite isolating membrane structure can be improved, the cycle life of the battery cell is favorably prolonged, and the use stability and safety are improved.

The utility model discloses an electrochemical device and electronic equipment, including electrode subassembly, including electrode main part and the first pole lug and the second pole lug of its same side extension, pole post subassembly is used for leading out the polarity of electrode main part, lower casing includes first casing and second casing and both connections form the step of intercommunication, wherein first casing is used for placing electrode main part, and second casing is used for placing pole lug, electrolyte and pole post subassembly, casing insulating part and pole post insulating part, and the connecting portion of pole lug and electrode main part is located at the step, upper cover plate is used for with lower casing connects and forms sealed structure, casing insulating part and pole post insulating part are located between pole post subassembly and lower casing, are used for the insulation of pole post subassembly and lower casing, the utility model discloses can effectively avoid the fatigue fracture of pole lug bending, and the step structure of setting reduces the heat of bending, improves energy density simultaneously.

The utility model discloses a pole piece which comprises a current collector, an active material layer arranged on the surface of the current collector and a through hole penetrating through the current collector and the active material layer. Therefore, the pole piece is provided with the through hole penetrating through the current collector and the active material layer arranged on the surface of the current collector, and when electrolyte is injected into the battery, the through hole can retain part of the electrolyte, so that the electrolyte retention capacity can be improved; and moreover, the through holes are formed, so that the overall contact area between the pole piece and electrolyte can be increased, the electrolyte can absorb the pole piece more easily, and the wettability can be improved. In addition, the through holes are formed to improve the liquid retention capacity, so that ion transmission in the battery can be improved, and the cycle life of the lithium battery can be prolonged.

The invention discloses a multilayer electrode preparation method, and relates to the technical field of battery electrode production. The preparation method comprises the following steps: mixing an active material, a conductive agent and a binder to obtain first slurry; adding a pore-forming agent into the first slurry, and mixing to obtain second slurry; coating a current collector with the first slurry to form a first electrode layer; coating the first electrode layer with second slurry to form a second electrode layer; alternately coating and drying the first slurry and the second slurry to form a multi-layer electrode; wherein the multi-layer electrode at least comprises a first electrode layer and a second electrode layer, the active material is a positive electrode active material or a negative electrode active material, the positive electrode active material is a carbon nanotube-copper sulfide composite material, and the second electrode layer is of a porous structure. According to the preparation method of the multi-layer electrode provided by the invention, the lithium ion battery with good cycle performance, slow capacity fading and high charge-discharge efficiency can be obtained.

The invention provides a composite diaphragm as well as a preparation method and application thereof. The present invention relates to a membrane comprising: a first base membrane layer comprising a first polymeric porous membrane; a gel-state electrolyte is filled in pores of the first polymer porous membrane; the second base film layer is arranged on the first base film layer; the second base membrane layer comprises a second polymeric porous membrane; a gel-state electrolyte is filled in pores of the second polymer porous membrane; the sponge structure layer is arranged between the first base film layer and the second base film layer; the porosity of the sponge structure layer is greater than that of the first base membrane layer and that of the second base membrane layer; and gel-state electrolyte is filled in pores of the sponge structure layer. The technical problem to be solved by the invention is how to provide the composite diaphragm, so that electrolyte can be effectively locked, and the liquid retention amount is increased. And moreover, the interface humidity can be improved, the interface resistance is reduced, and the matching property with a battery negative electrode is good.

In order to overcome the problem that the existing high-pressure lithium-ion batteries have insufficient liquid retention and affect the battery cycle performance, the present invention provides a lithium-ion battery, including a positive electrode, a negative electrode, a glue-coated separator and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode material layer, and the compaction density of the positive electrode material layer is 3.3g / cc to 4.3g / cc, the negative electrode includes a negative electrode material layer, and the compaction density of the negative electrode material layer is 1.55-1.85g / cc, the glue-coated separator includes a porous substrate and a glue-coated layer arranged on at least one side of the porous substrate, the glue-coated layer includes PVDF, and the non-aqueous electrolyte includes a solvent, an electrolyte salt and a compound shown in structural formula 1: wherein n=0-2; R 1‑(5+n) Each is independently selected from H, halogen or C1-C10 substituted or unsubstituted alkyl. The lithium ion battery provided by the present invention has good liquid retention capacity and effectively improves its high temperature cycle performance and high temperature storage performance.

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a solid particle volatilization pore-forming type sodium-electricity dry-method positive plate as well as a preparation method and application thereof. The positive plate is prepared by compounding positive electrode diaphragms prepared from a positive electrode material by a dry method on two sides of a current collector, the positive electrode material comprises a positive electrode active material, a conductive agent, a binder and a pore-forming agent, the pore-forming agent is solid particle hexachloroethane, and the D50 particle size of the solid particle hexachloroethane is less than or equal to 0.3 mu m. And the solid pore-forming agent is added into the positive electrode and forms tiny pores after high-temperature sublimation, so that the porosity of the pole piece is improved, the electrolyte retention capacity is increased, the concentration polarization is reduced, and the rate capability is improved under high surface density, thereby improving the energy density of the sodium ion battery.

The present application discloses a polyurethane-based nanofiber membrane coaxially coated with a MOF layer, and a preparation method and application thereof. From the inside to the outside, it includes polyurethane nanofibers as a core layer, a metal chelated polyaniline layer as an intermediate layer, and MOF particles as a shell layer. Avoiding the use of polyolefin porous membranes, using a composite diaphragm formed by a combination of polyurethane and MOF materials with high thermal stability can fully guarantee the thermal shrinkage performance of the diaphragm. At the same time, the presence of the metal chelated polyaniline layer also ensures the close combination of the MOF layer and the polyaniline layer, avoiding the risk of the MOF layer falling off.

This utility model belongs to the field of battery manufacturing technology and discloses a punching mold for aluminum-plastic film of soft-pack batteries. The punching mold for aluminum-plastic film of soft-pack batteries includes a concave mold, a guide mold, at least one first punch, and at least one second punch. The concave mold has at least one first groove and at least one second groove, with the second groove located on either side of the first groove. The guide mold is disposed on the concave mold, and the aluminum-plastic film to be formed is sandwiched between the guide mold and the concave mold. The first punch includes at least one first protrusion, which can pass through the guide mold and move towards the first groove to punch and form the receiving cavity. The second punch includes at least one second protrusion, which is located on either side of the first punch. The second protrusion passes through the guide mold and moves towards the second groove to punch and form the receiving space, thereby enabling the manufacture of aluminum-plastic film that improves the support strength, liquid retention, and / or safety of soft-pack batteries.

A high temperature resistant flame retardant nanofiber membrane and its preparation method and application belong to the technical field of lithium ion battery materials. The high temperature resistant flame retardant nanofiber membrane is a polyurethane-based nanofiber membrane with an ultra-long hydroxyapatite nanowire layer coaxially coated on the surface of polyurethane nanofibers. The preparation method is: polyurethane is dissolved in an organic solvent to prepare a spinning solution, and the spinning solution is used to prepare a polyurethane nanofiber membrane by an electrospinning method. Ultra-long hydroxyapatite nanowires are in situ grown on the surface of polyurethane nanofibers by a calcium oleate precursor solvothermal method. The ultra-long hydroxyapatite nanowire layer on the surface of the high temperature resistant flame retardant nanofiber membrane prepared by the present invention has high thermal dimensional stability, and the ultra-long hydroxyapatite nanowires have the ability to regulate lithium ion transmission and induce uniform lithium deposition, thereby inhibiting dendrite growth and reducing the overpotential during the charge and discharge cycle. At the same time, it has extremely high flame retardant properties, which significantly improves the electrochemical performance and safety of the battery.

The invention discloses a lithium battery diaphragm and a preparation method thereof, the lithium battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises modified soybean meal activated carbon, an acrylate copolymer and a dispersant, a method for obtaining the modified soybean meal activated carbon comprises the following step: carrying out normal-temperature liquid phase modification on the soybean meal activated carbon by adopting a polyacrylamide-containing solution so as to graft polar groups on the surface of the soybean meal activated carbon, wherein the soybean meal activated carbon is carbonized soybean meal. And the modified soybean meal active carbon is beneficial to enhancing the liquid absorption, liquid retention and wettability of the diaphragm and ensuring more effective transmission of lithium ions, so that the performance of the lithium battery is improved.

The application discloses a kind of gel PMMA slurry, diaphragm lithium battery and preparation method thereof.Gel PMMA slurry preparation method includes the following steps: step 1: methyl methacrylate is added to N-methyl pyrrolidone, and stirred uniformly;Then initiator azobisisobutyronitrile is added, and stirred min;Subsequently, temperature is raised to 50-70℃, and the heating rate is 3-5℃ / min, keep 30-50min, then continue to heat to 80-90℃, keep 2-4h, and the heating rate is 3-5℃ / min, then cool to room temperature to obtain PMMA gel;Step 2: alumina powder is added to N-methyl pyrrolidone, and stirred 30-40min;Then use bar pin type sand mill to sand mill to obtain inorganic powder solution;Step 3: PMMA gel prepared in step 1 is added to the inorganic powder solution obtained in step 2, and stirred to mix uniformly;Then dimethyl carbonate is added, and stirred to obtain gel PMMA slurry.The prepared gel PMMA coated diaphragm has great adhesion to pole piece and higher liquid absorption rate and liquid retention rate.

The invention provides a layered oxide material with a nanometer woven net interface structure and a preparation method and application thereof, and belongs to the field of electrode materials, a dilute acid solution is used as a reaction medium, and a spray pyrolysis mode is combined to enable dilute acid to fully react with a residual alkali compound on the surface of layered oxide, so that the layered oxide material is obtained. And synchronously converting into a uniform nano woven net interface structure in situ. A uniform nano interface structure can be prepared, belongs to a flexible film structure and has a relatively strong bonding effect, and the interface structure can persistently and stably exist in a charging and discharging process, so that the structural strain is reduced; the nano woven net interface structure has a relatively large specific surface area, so that the contact area and the liquid retention amount of the layered oxide material and an electrolyte are increased, and the diffusion of Li < + > and the migration of electrons are accelerated; the uniform knitted net interface structure can inhibit the surface oxidation of the material and the reaction with water and carbon dioxide in the air, improve the air tolerance of the matrix material, and also can greatly inhibit the erosion effect of the electrolyte on the matrix material.

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a battery shell which comprises a shell body and a cover plate covering the shell body, a containing cavity is defined by the shell body and the cover plate, the containing cavity is used for placing a battery cell, a reinforcing protection layer is arranged on one face, away from the containing cavity, of the cover plate, and the reinforcing protection layer is used for protecting the battery cell. The reinforcing protection layer is of a hollow structure protruding relative to the plane of the cover plate and comprises a plurality of reinforcing units connected with one another. By arranging the reinforced protective layer, the plastic strain capacity of the cover plate can be improved, so that the influence on the application of the battery caused by large deformation when the battery is impacted or falls off in the transportation or use process is avoided, and the safety performance of the battery is further improved; in addition, the reinforcing protection layer is of a groove structure protruding outwards relative to the containing cavity, electrolyte can be stored, and then the electrolyte retention capacity of the battery is improved. In addition, the utility model also discloses a battery comprising the battery shell and an electric device.