987 results about "Positive current" patented technology

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive pole piece, an isolating membrane, a negative pole piece and electrolyte, and the positive pole piece, the isolating membrane and the negative pole piece are arranged in a laminated manner; the positive pole piece comprises a positive current collector and a positive active layer arranged on at least one side of the positive current collector, the negative pole piece comprises a negative current collector and a negative active layer arranged on at least one side of the negative current collector, and the positive active layer comprises lithium iron phosphate primary particles; the isolating membrane comprises a base membrane and a bonding layer, the bonding layer is of a porous continuous structure, and the bonding layer is at least arranged on one side, facing the positive electrode active layer, of the base membrane; the electrolyte comprises a first solvent, and the first solvent comprises one or more of dimethyl carbonate and linear carboxylic ester. The battery monomer has relatively good cycle performance.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece and a negative pole piece, the positive pole piece comprises a positive current collector and a positive film layer, the positive film layer comprises a positive active material, the positive active material comprises lithium-containing phosphate of an olivine structure, and the electrolyte is a lithium-containing lithium-containing phosphate of a lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing electrolyte. The resistance of the positive pole piece is 0.1 ohm to 30 ohm, the negative pole piece comprises a negative current collector and a negative film layer, the resistance of the negative pole piece is 0.001 ohm to 0.01 ohm, the electrolyte comprises an organic solvent, the organic solvent comprises a chain ester solvent, and the mass content of the chain ester solvent in the organic solvent is 5% to 75%; the conductivity of the electrolyte at room temperature is 13 mS / cm to 20 mS / cm. The heat production amount of the battery monomer can be reduced, and the use reliability and the cycle performance of the battery monomer can be improved.

The invention provides a COT step-down converter comprising an inductive current detection circuit configured to detect an inductive current flowing through an inductor connected to a system output of an output voltage of an output system of the COT step-down converter, and generate a current zero-crossing detection signal indicating whether the inductive current crosses zero, the inductive current zero-crossing means that the inductive current is changed from positive current to negative current; and a sleep mode control circuit configured to generate a sleep mode control signal for controlling one or more circuit modules in the COT buck converter to change from an operating state to a closed state based on the current zero-crossing detection signal, an output feedback voltage representing a system output voltage of the COT buck converter, and a predetermined reference voltage.

The invention relates to the technical field of batteries, in particular to a battery. Comprising a positive plate and electrolyte, the positive plate comprises a positive current collector and a coating positioned on the surface edge of at least one side of the positive current collector along the length direction; the coating comprises filling particles, and the filling particles comprise at least one of inorganic particles and nitrogen-containing particles; the electrolyte comprises non-fluorinated cyclic carbonate and fluorinated ethyl acetate; the non-fluorinated cyclic carbonate comprises propylene carbonate and optional ethylene carbonate; on the basis of the total mass of the electrolyte, the content ratio C1 of the non-fluorinated cyclic carbonate is smaller than or equal to 25%, the content ratio C11 of the propylene carbonate is 3.1%-24.9%, the content ratio C12 of the ethylene carbonate is 0%-5%, and the content ratio C2 of the fluorinated ethyl acetate is 20.2%-70%. The battery provided by the invention can improve the problem of lithium precipitation under low-temperature discharge, and has relatively good short-circuit safety performance and relatively low high-temperature gas production rate.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly, the electrode assembly comprises a plurality of positive pole pieces and a plurality of negative pole pieces, and the positive pole pieces and the negative pole pieces are stacked in the thickness direction of the battery monomer; the positive pole piece comprises a positive pole current collecting part and a positive pole film layer arranged on at least one side of the positive pole current collecting part, the ratio of the size of the positive pole film layer in the length direction of the battery monomer to the size of the positive pole film layer in the width direction of the battery monomer is 4-7, and the size of the positive pole film layer in the length direction is 300-650 mm; the positive electrode film layer includes a lithium-containing phosphate of an olivine structure and a lithium-containing iron oxide. The battery monomer provided by the invention can improve the power performance and the high-temperature cycle performance at the same time.

The invention provides a lithium ion secondary battery, a battery device, a power utilization device, a preparation method of a positive electrode active material and a preparation method of a positive electrode plate. The lithium ion secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the positive pole piece comprises a positive current collector and a positive film layer arranged on at least one side of the positive current collector, the positive film layer comprises a positive active material, and the positive active material comprises lithium-containing transition metal phosphate particles of which at least partial surfaces are provided with carbon coating materials; in the tangent plane of the positive electrode film layer along the thickness direction of the pole piece, the area proportion of particles with the particle size greater than or equal to 1 mu m is 30.0-50.0%; and the mass ratio of the magnetic substance in the positive electrode film layer is greater than or equal to 20 ppm and less than or equal to 1980 ppm.

The invention discloses a permanent magnet synchronous motor current dynamic coupling correction method, which comprises the following steps of collecting motor three-phase stator current, performing Clark transformation to obtain a current value under an alpha-beta static coordinate system, and meanwhile, collecting through a position sensor to obtain an electrical angle true value; performing low-pass filtering calculation on the current value under the alpha-beta static coordinate system to obtain a filtering current value, and performing operation through a sliding-mode observer and a PLL phase-locked loop to obtain an electrical angle observation value; calculating to obtain a compensation adjustment coefficient according to the true value and the observed value of the electrical angle, and further calculating to obtain a current value after phase offset compensation; and performing complementary filtering calculation on the filtering current value and the current value after phase offset compensation to obtain a coupling correction current value for current loop calculation, inputting the coupling correction current value into a motor control current loop PID algorithm, and generating a PWM driving signal to drive a motor in combination with vector control. According to the method, the problems of high-frequency interference and phase deviation of current sampling can be solved, so that the motor control efficiency and the dynamic performance are improved.

The invention relates to the technical field of batteries, and discloses a battery cell and a battery, the battery cell comprises a negative pole piece, a diaphragm and a positive pole piece; the negative pole piece comprises a negative current collector and a negative active material coating; the positive pole piece comprises a positive current collector and a positive active material coating; the diaphragm comprises a base material, a first coating and a second coating, wherein the porosity of the first coating is A, the thickness of the first coating is a [mu] m, the porosity of the second coating is B, the thickness of the second coating is b [mu] m, the porosity of the negative electrode active material coating is C, the thickness of the negative electrode active material coating is c [mu] m, the porosity of the positive electrode active material coating is D, and the thickness of the positive electrode active material coating is d [mu] m; and by limiting that [(Dd + Bb) / (b + d)] / [(Aa + Cc) / (a + c)] is larger than or equal to 0.8 and smaller than or equal to 1.2, the porosity of the two sides of the base material of the diaphragm reaches a relatively close state, the cycle performance of a battery cell is improved, and the stability and reliability of the battery in the long-term use process are guaranteed.

The invention provides a secondary battery and an electric device, and relates to the field of batteries. The secondary battery comprises a positive pole piece, a negative pole piece and an isolating membrane, the positive pole piece comprises a positive current collector and a positive membrane layer arranged on at least one side surface of the positive current collector, and the compaction density of the positive membrane layer is 2.0-3.0 g / cm < 3 >; the negative pole piece comprises a negative current collector and a negative film layer located on at least one surface of the negative current collector, and the compaction density of the negative film layer is 1.4 g / cm < 3 >-1.85 g / cm < 3 >; the isolating membrane comprises a base membrane, the thickness of the base membrane ranges from 4 micrometers to 12 micrometers, the base membrane is provided with nanopores, and the average pore size of the nanopores ranges from 10 nm to 300 nm. The secondary battery has high energy density and improved safety performance.

The invention relates to the field of electric power, and discloses an electric energy metering method, system and device and a storage medium, and the method comprises the steps: employing an FIR zero compensation angle difference algorithm to correct a synchronization error angle difference between a current signal and a voltage signal, employing a self-convolution cascade zero-pole low-pass filter algorithm to carry out the filtering processing of a synchronization current signal and a synchronization voltage signal, and obtaining a current signal and a voltage signal; correcting a real-time phase difference between the filtering current signal and the filtering voltage signal by adopting a high-real-time FIR zero-step angular difference algorithm to obtain a corrected current signal and a corrected voltage signal, sampling to obtain current data and voltage data, and obtaining an initial electric energy metering result according to the current data and the voltage data; and obtaining environmental factors, calling a pre-trained electric energy metering error prediction model to obtain an electric energy metering prediction error, and obtaining a final electric energy metering result according to the initial electric energy metering result and the electric energy metering prediction error. The electric energy metering method with high accuracy and high linearity is provided, and the problem that an existing electric energy metering mode is large in measurement error is solved.

The invention provides a single battery, a battery device and a power utilization device, the single battery comprises a laminated electrode assembly, the laminated electrode assembly comprises a positive pole piece, an isolating membrane and a negative pole piece which are laminated, the negative pole piece comprises a negative current collector and a negative membrane layer arranged on at least one side of the negative current collector, the positive pole piece comprises a positive pole current collector and a positive pole film layer arranged on at least one side of the positive pole current collector, the positive pole film layer comprises a positive pole active material, the positive pole active material comprises lithium-containing transition metal phosphate particles, the compaction density of the positive pole piece is 2.25-2.65 g / cm < 3 >, and the lithium-containing transition metal phosphate particles are uniformly distributed on the positive pole piece. In a sphericity-like area cumulative distribution curve of particles obtained by a tangent plane of the positive electrode film layer along the thickness direction of the pole piece, the sphericity-like degree LA50 is 0.70-0.75, the isolation film comprises a base film and coatings arranged on two sides of the base film, and a bonding layer in each coating is a porous structure continuous layer and comprises a fluorine-containing polymer. The battery monomer disclosed by the invention can give consideration to both energy density and cycle performance.

The invention provides a battery monomer, a battery device and electric equipment, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece and a negative pole piece, the positive pole piece comprises a positive current collector and a positive active material layer arranged on at least one side of the positive current collector, and the positive active material layer comprises a positive active material; the positive electrode active material comprises lithium-containing phosphate, and the compaction density of the positive electrode plate is 2.46 g / cm < 3 >-2.8 g / cm < 3 >; the negative pole piece comprises a negative current collector and a negative active material layer arranged on at least one side of the negative current collector, and the compaction density of the negative pole piece is 1.25 g / cm < 3 >-1.5 g / cm < 3 >; the electrolyte comprises fluorine-containing lithium sulfimide and lithium hexafluorophosphate, and based on the total mass of the electrolyte, the ratio of the mass ratio of the fluorine-containing lithium sulfimide to the mass ratio of the lithium hexafluorophosphate is 0.4-0.8; and the mass of the electrolyte corresponding to each Ah of the battery monomer is 2.2-3g.

The invention provides a positive pole piece, a secondary battery and an electronic device. The positive pole piece comprises a positive current collector, a positive material layer and an insulating layer, and the positive material layer and the insulating layer are located on at least one surface of the positive current collector; the positive electrode current collector comprises a main body part and an epitaxial part which are connected with each other, the positive electrode material layer comprises a first positive electrode material layer and a second positive electrode material layer, and the insulating layer comprises a first insulating layer and a second insulating layer; the positive electrode material layer and the first insulating layer are arranged on the main body part; along the thickness direction of the positive pole piece, the first insulating layer is positioned between the second positive pole material layer and the positive pole current collector; the epitaxial part comprises a connecting region and a tab region, and the second insulating layer is arranged in the connecting region; the thickness of the first insulating layer is e [mu] m, the thickness of the second insulating layer is g [mu] m, and 1 < = e < g < = 30. By adopting the positive pole piece disclosed by the invention, the safety performance of the secondary battery can be improved, and the energy density of the secondary battery is considered.

A dual path PLL provides excellent output phase stability over PVT variations, without implementing a high accuracy TDC. A digital integral path employs a binary phase detector, comparing the reference and feedback signals, and an integrator to generate an oscillator control input to lock the long-term output phase to the reference signal. An analog proportional path employs a linear (e.g., edge triggered) phase detector and a charge pump and filter to generate an oscillator control input to mitigate phase noise in the output signal. The feedback signal to the proportional path is delayed, which has the effect of increasing the width of phase error pulses, and moving the charge pump operating point away from the zero point where it generates both positive and negative currents, which are difficult to match. A second linear phase detector in the proportional path compensates for the increased phase error pulse width by comparing the delayed and non-delayed feedback signals, and generating pulses in the opposite direction.

The invention provides a battery monomer, a battery device, a power utilization device and an energy storage device. The battery monomer comprises a laminated battery cell, the laminated battery cell comprises a positive pole piece and a negative pole piece, the positive pole piece comprises a positive current collector and a positive film layer arranged on at least one side of the positive current collector, and the positive film layer comprises lithium-containing transition metal phosphate particles of which at least part of the surface is provided with a carbon material; in a cumulative distribution curve of a graphitization degree C value obtained by the positive electrode film layer in a surface scanning mode of a laser microscopic confocal Raman spectrometer, the median C50 of the graphitization degree is 0.95-1.20, the graphitization degree C value is IG / ID, IG represents the G peak intensity of a Raman spectrum at 1580 + / -100 cm <-1 >, ID represents the D peak intensity of the Raman spectrum at 1350 + / -100 cm <-1 >, and when the battery monomer is in a full discharge state, the battery monomer is in a non-full discharge state. And the compaction density of the positive pole piece is 2.3-2.6 g / cm < 3 >. The battery monomer provided by the invention has high capacity and good cycle performance.

The embodiment of the utility model provides a battery monomer, a battery device, an energy storage device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell and an electrode assembly, the electrode assembly is accommodated in the shell and comprises a pole piece and a diaphragm, a positive pole piece in the pole piece comprises a positive current collector body and a positive pole lug connected with the positive current collector body, a coating layer, an insulating layer and a cementing layer are arranged on the surface of the positive current collector body, and the insulating layer is arranged on the surface of the coating layer. And the insulating layer positioned between the coating layer and the positive pole lug is provided with the cementing layer bonded with the diaphragm. According to the invention, the condition that the non-welded area of the lug root part is pressed between the positive pole piece and the negative pole piece can be reduced.

The present invention provides a battery, comprising: a positive plate comprising a positive current collector and a positive active layer present on at least one side surface of the positive current collector, the positive active layer comprising a positive active material, the positive active material comprising lithium cobalt oxide; the negative electrode plate comprises a negative electrode current collector and a negative electrode active layer existing on the surface of at least one side of the negative electrode current collector, and a concave part is formed in the surface of the negative electrode active layer; the battery meets the condition that k / h is more than or equal to 0.03% and less than or equal to 0.6%; # imgabs0 # 0.8 [mu] m < = D1 < = 3 [mu] m; wherein k is the elongation rate of the positive plate; h is the depth of the recess in [mu] m; d1 is the particle size Dn90 of the lithium cobalt oxide, and the unit is micron; d2 is the particle size Dn50 of the lithium cobalt oxide, and the unit is micron; s is the tensile strength of the positive plate. The preparation method can inhibit the breakage of the pole piece, and improves the high-temperature cycle life, safety and other performances of the battery.

The utility model provides a cylindrical lithium battery. An anti-explosion valve plate in the cylindrical lithium battery is provided with a first nick and second nicks, the first nick is a closed circle with the head end and the tail end connected, the second nicks are in a line segment shape, the first nick and the second nicks intersect, a positive collector plate is provided with first holes and second holes, the sum of the areas of all the second holes is 0.9-1.5 times of the area of the first hole, and the sum of the areas of all the second holes is 0.9-1.5 times of the area of the first hole. The diameter D3 of the first hole is 1.4-1.8 times of the diameter D6 of the roll core hole; the negative collector plate is provided with a heightening platform which is connected with the shell bottom and has a flat surface, and the planeness of the surface of the heightening platform is 0.01-0.05 mm. According to the cylindrical lithium battery, the explosion-proof valve plate can be timely and effectively opened, so that the cylindrical lithium battery has the characteristic of relatively high safety, and in addition, the welding effects of the positive current collecting plate, the negative current collecting plate, the roll core and the shell are good.

The invention discloses a battery and a power utilization device, and belongs to the technical field of secondary batteries. The battery comprises a positive plate, the positive plate comprises a positive current collector and a positive active material layer, the positive active material layer comprises a positive active material and a lithium supplement agent, and the lithium supplement agent comprises an iron-containing lithium supplement agent; the ratio (set as a) of the characteristic peak area of Fe < 3 + > to the peak area of O1s in the hollow electric state in the XPS spectrum of the positive plate, the ratio (set as b) of the negative electrode discharge capacity to the positive electrode discharge capacity of the battery and the discharge curve end potential (set as cV) of the negative plate are adjusted, so that a * b * c is controlled within a suitable range, the gram capacity of the positive plate can be effectively improved, and the battery performance is improved. And meanwhile, the cycle performance of the battery is ensured.

The invention relates to the technical field of lithium ion batteries, in particular to a full-tab cylindrical lithium ion battery and a power utilization device, the full-tab cylindrical lithium ion battery comprises a winding type battery cell, and a positive plate, a diaphragm and a negative plate which are laminated according to a specific mode; the positive plate comprises a positive current collector as well as a positive slurry coating area and a positive empty foil area which are positioned on at least one surface of the positive current collector; the negative plate comprises a negative current collector as well as a negative slurry coating area and a negative empty foil area which are positioned on at least one surface of the negative current collector; after winding, the positive empty foil area and the negative empty foil area respectively form a positive tab and a negative tab through a kneading, cutting and stacking or ultrasonic process; when the battery discharges at 10C, the slope of a curve relation formed by data fitting of the temperature rise coefficient and the discharge current is 0.2-1, the temperature rise performance of the full-tab battery cell is obviously superior to that of a traditional tab battery, more electric quantity can be discharged in a lower temperature interval, and the full-tab battery cell has relatively good safety and relatively high energy density.

The invention discloses a high-safety battery design method for inhibiting thermal runaway and thermal spread, which is characterized in that a functional material with a certain thickness is coated on an exposed part of an anode current collector in a battery, and the functional material has a high resistance characteristic, so that an internal short circuit between the anode current collector and a cathode active material causes a battery discharge reaction. The safety of the battery can be improved, and thermal runaway and thermal spread of the battery are inhibited.

The invention provides a modular multilevel converter current control method based on parameter identification. According to the scheme, the system gain coefficient is identified and dynamically updated on line through the recursive least square method, the current model is corrected in real time, the interference of inductance drift on control is solved, the deviation of current tracking, circulating current suppression and capacitor voltage balance is quantized in combination with a multi-objective function, and dynamic priority adjustment of a control target can be achieved through weight distribution. The switching signal is directly generated according to the control strategy corresponding to the multi-objective function, the delay of the traditional modulation link is avoided, the dynamic response speed is improved, and the target sub-module selection mechanism optimizes the capacitor voltage balance and reduces the device loss. In some embodiments, a failover function is also provided to ensure system stability under extreme conditions. While the current tracking precision is improved, multi-target collaborative optimization is realized, and an efficient and reliable technical support is provided for flexible interconnection of a new energy high-permeability power grid.

The invention provides a battery monomer, a battery device and electric equipment, the battery monomer comprises a shell, an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane located between the positive pole piece and the negative pole piece, the positive pole piece comprises a positive current collector and a positive membrane layer, and the negative pole piece comprises a negative current collector and a negative membrane layer. The positive electrode current collector comprises a positive electrode main body part and a positive electrode tab part, the positive electrode tab part extends out of the positive electrode main body part, the positive electrode film layer is located on at least one side of the positive electrode main body part, and the size of the positive electrode film layer is 200-700 mm along the direction in which the positive electrode tab part extends out of the positive electrode main body part; the electrolyte comprises chain carboxylic ester, and based on the total mass of the electrolyte, the mass ratio of the chain carboxylic ester is 5%-50%.

The invention relates to the technical field of photovoltaic cells, in particular to a back contact photovoltaic module, a glue printing screen printing plate and a back contact solar laminated module. The back contact photovoltaic module at least comprises two stacked and connected battery pieces, and the adjacent stacked battery pieces are electrically connected through a conductive adhesive. And in two adjacent stacked battery pieces, the positive current output part of one battery piece is connected with one end of the conductive adhesive, and the negative current output part of the other battery piece is connected with the other end of the conductive adhesive. In the thickness direction of the back contact photovoltaic module, the conductive adhesive covers part of the surfaces of the two adjacent stacked battery pieces, and the bottom of the conductive adhesive is in a step shape. The two adjacent stacked battery pieces are electrically connected through the conductive adhesive, and the conductive adhesive can be printed at a time through the adhesive printing screen printing plate, so that the production efficiency and the yield of the imbricate structure formed by the two adjacent battery pieces are improved, and the production cost is reduced. The conductive adhesive has softness and good adhesion, and can be tightly attached to two adjacent stacked battery pieces.

The invention discloses a battery monomer, a battery device and electric equipment, and belongs to the technical field of batteries. The battery monomer comprises a positive pole piece which comprises a positive current collector, a first positive pole film layer and a first insulating layer, the positive current collector comprises a positive pole lug protruding out of a positive pole main body part in a first direction, and the first insulating layer and the first positive pole film layer are arranged on the same side surface of the positive current collector in the thickness direction; the first insulating layer is close to the positive electrode tab relative to the first positive electrode film layer along a first direction, and the first positive electrode film layer comprises lithium-containing phosphate with a carbon coating layer; the negative pole piece comprises a negative pole film layer, and along the first direction, the distance of the edge of the negative pole film layer exceeding the edge of the first positive pole film layer is greater than or equal to 2mm; in the first direction, the first insulating layer and the first positive electrode film layer have a first overlapping region, and in the first overlapping region, the first positive electrode film layer is arranged between the positive electrode current collector and the first insulating layer in the thickness direction of the positive electrode piece, so that the reliability of the single battery can be improved.

The invention relates to the technical field of batteries, in particular to a positive plate and a lithium ion secondary battery. The positive plate comprises a positive current collector, a positive bottom coating and a positive active layer; the positive bottom coating is positioned between the positive current collector and the positive active layer; the positive current collector comprises a polymer layer and a metal layer positioned on at least one side surface of the polymer layer; the polymer layer comprises at least one of polyethylene glycol terephthalate, polypropylene, polyethylene and polyimide, the metal layer comprises an element Al, and the positive electrode primer layer comprises a first conductive agent containing graphene and a first binder; the thickness of the polymer layer is 2-8 [mu] m, and the thickness of the metal layer is 0.5-2 [mu] m; the positive electrode bottom coating comprises a plurality of protrusions, the height of the protrusions is X, and X is larger than or equal to 3 micrometers and smaller than or equal to 7 micrometers. The lithium ion secondary battery comprises the positive plate provided by the invention. The binding force between the positive current collector and the active layer is strong, and the conductivity is good; the lithium ion secondary battery is good in cycle performance and high in energy density.

Provided in the embodiments of the present application are a secondary battery and an electric device. In the secondary battery provided in the embodiments of the present application, the thickness Hc of a positive membrane layer of a battery, the contact angle θ of an electrolyte on a positive current collector, the weighted value a of a dielectric constant of an organic solvent in the electrolyte, and the total lithium-ion concentration M in the electrolyte are controlled, and the following relational expression is satisfied: 0.450≤(cosθ×a) / (M×Hc)≤0.792, so that the prepared secondary battery has lower self-discharge performance and better kinetic performance and cycle performance while meeting the requirement of high energy density.

Battery device comprising a thermal insulation element and at least two battery cells arranged along a first direction, wherein the battery cell comprises an electrode assembly and electrolyte solution, the electrode assembly comprising positive electrode plates and negative electrode plates, the positive electrode plate comprising positive current collectors and positive film layers arranged on at least one side of the positive current collectors, the positive film layer comprising lithium phosphate, wherein the negative electrode plate comprises negative current collectors and negative film layers arranged on at least one side of the negative current collector, the negative film layer comprising graphite particles. characterized in that the electrolyte solution comprises fluorosulfonylimide salt, wherein the mass fraction of the fluorosulfonylimide salt in the electrolyte solution is 2% to 12%; wherein the battery cell comprises two first surfaces which are opposite each other along the first direction, wherein the thermal insulation element covers at least one of the two first surfaces and the dimension of the thermal insulation element along the first direction is 0.3 mm to 5 mm.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, an isolating membrane and a negative pole piece, the positive pole piece comprises a positive current collector and a positive active material layer arranged on at least one side of the positive current collector, the negative pole piece comprises a negative current collector and a negative active material layer arranged on at least one side of the negative current collector, the positive active material layer comprises lithium-containing phosphate with an olivine structure, the electrolyte comprises a silane-based additive, and the mass content of the silane-based additive in the electrolyte is 0.05-1%; the electrolyte further comprises lithium salt, the lithium salt comprises lithium hexafluorophosphate, the mass content of the lithium hexafluorophosphate in the electrolyte is 8%-12%, and the total mass content of the lithium salt in the electrolyte is 10%-18%. The use reliability of the battery cell can be improved.

A positive electrode sheet, a secondary battery, a battery pack and an electricity-consumption equipment are provided. The positive electrode sheet includes a positive current collector. At least one surface of the positive current collector is provided with a positive active material layer. In any 25 μm×25 μm region of a cross section of the positive active material layer, a percentage of an area of a first positive active material with a cracked structure to a total area of the region is a %, 5≤a≤20.