8893 results about "Pole piece" patented technology

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, and the electrode assembly comprises a positive pole piece and a negative pole piece; the positive pole piece comprises a positive pole current collecting part and a positive pole film layer; the positive pole film layer comprises lithium-containing phosphate with an olivine structure; the negative pole piece comprises a negative pole current collecting part and a negative pole film layer, and the negative pole film layer comprises a carbon-based material; the electrolyte comprises a carboxylic ester solvent, a first additive and fluorine-containing lithium sulfimide, and the mass content of the carboxylic ester solvent is 8%-60%; the total mass content of the first additive is 2.5%-10%, the first additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than 0, and the ethylene carbonate derivative comprises a compound shown in the formula A; the mass content of the fluorine-containing lithium sulfimide is 4%-8%. According to the invention, the rapid charging performance and the cycle performance of the battery monomer can be improved. # imgabs0 # formula A

The invention belongs to the technical field of magnetofluid sealing in mechanical engineering, and particularly relates to a magnetofluid sealing device based on a labyrinth tower shape, the magnetofluid sealing device is applied to a main shaft, the magnetofluid sealing device comprises a shell assembly and a magnetofluid sealing assembly, and the shell assembly comprises a first sealing shell and an end cover; the magnetic fluid sealing assembly comprises a main shaft sleeve, a pole shoe set and a permanent magnet, a labyrinth tower-shaped sealing structure is formed between the pole shoe set and the main shaft, and the good sealing effect can still be achieved under the working conditions of large shaft diameter, high pressure and high speed; in addition, the invention further provides a sealing performance test bench for the magnetofluid sealing device based on the labyrinth tower shape, on the basis that the main shaft driving assembly is used for providing rotating speed and torque for the main shaft and the pressurizing assembly is used for providing constant pressure for the sealing device, the sealing performance of the magnetofluid sealing device is tested in cooperation with the detection assembly under the working conditions of adjusting different rotating speeds, different pressures and the like. The sealing performance of the magnetofluid sealing device is tested in real time, and the method has important guiding significance on design and optimization of a sealing gap structure.

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, and the electrode assembly comprises a positive pole piece and a negative pole piece; the positive pole piece comprises lithium-containing phosphate with an olivine structure; the negative pole piece comprises graphite particles; the electrolyte comprises a carboxylic ester solvent and a first additive, the thickness of the single-side negative electrode film layer is 50 microns to 75 microns, and the volume average particle size of the graphite particles is 8.5 microns to 13.5 microns; based on the mass of the electrolyte, the mass content of the carboxylic ester solvent is 8%-60%, the total mass content of the first additive is 3%-10%, the first additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than or equal to 3%, and the ethylene carbonate derivative comprises a compound shown in the formula A. According to the invention, the rapid charging performance and the cycle performance of the battery monomer under high energy density can be improved. # imgabs0 # formula A

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrolyte, a positive pole piece and a negative pole piece, the positive pole piece comprises a positive pole current collecting part and a positive pole film layer located on at least one surface of the positive pole current collecting part and containing a positive pole active material, and the positive pole active material comprises lithium-containing phosphate of an olivine structure; the coating weight of one side of the positive electrode film layer is 200mg / 1540.25 mm < 2 > to 370mg / 1540.25 mm < 2 >, the negative electrode plate comprises a negative electrode current collecting part and a negative electrode film layer which is positioned on at least one surface of the negative electrode current collecting part and contains a negative electrode active material, the negative electrode active material comprises a carbon-based material, the conductivity of the electrolyte is 13-20mS / cm, the battery monomer is subjected to constant-current discharge from a 100% state of charge (0.33 C) to 2.0 V at 25 DEG C, and a discharge platform voltage V1 is 3.19-3.235 V. According to the invention, the fast charging performance, the energy density and the cycle performance of the battery monomer can be improved.

The invention provides a battery monomer, a battery device and a power utilization device. Each battery monomer comprises a shell and an electrode assembly in the shell, the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane between the two pole pieces, 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, and the positive active layer comprises a positive active material; the positive electrode active material comprises a nickel-containing lithium transition metal oxide and a lithium-containing phosphate, the molar weight of the Ni element in the nickel-containing lithium transition metal oxide accounts for 70-95% of the total molar weight of the transition metal, the positive electrode active material comprises Ni, Co, Mn, Fe and Li elements, and the ratio of the mass of the Ni element in the positive electrode active material to the sum of the mass of the Fe element and the mass of the Mn element is 0.15-2.

The invention discloses a solid-state battery cell manufacturing method and device based on single-sided rubber frame forming, and relates to the technical field of solid-state battery manufacturing. The method comprises the following steps: manufacturing a rubber frame on one surface of a first pole piece positioned at a forming station; the second pole pieces and the first pole pieces with the rubber frames are sequentially and alternately conveyed to a lamination station, and the first pole pieces and the second pole pieces are sequentially and alternately laminated, so that the second pole pieces are embedded into the rubber frames of the first pole pieces; wherein the electrodes of the first pole piece and the second pole piece are opposite, and the thickness of the rubber frame is greater than or equal to that of the second pole piece. According to the invention, two times of rubber frame forming on one pole piece are not needed, so that the connectivity between the pole pieces is improved, and the conditions that the solid electrolyte layer and the pole pieces deviate relatively and the two adjacent pole pieces are short-circuited are avoided.

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 positive pole piece, a negative pole piece and an isolating membrane, and the isolating membrane is located between the positive pole piece and the negative pole piece; the positive pole piece comprises a positive pole lug, a positive pole current collecting part and a positive pole film layer which is arranged on at least one surface of the positive pole current collecting part along the thickness direction of the positive pole piece and contains a positive pole active material, and the positive pole lug is arranged on at least one side of the positive pole current collecting part; the negative pole piece comprises a negative pole lug, a negative pole current collecting part and a negative pole film layer which is arranged on at least one surface of the negative pole current collecting part along the thickness direction of the negative pole piece and contains a negative pole active material, and the negative pole lug is arranged on at least one side of the negative pole current collecting part; and the ratio of the total thickness of the negative electrode film layers in the negative electrode plate to the thickness of the negative electrode plate is 0.95-0.97. According to the invention, the rapid charging performance and the cycle performance of the battery monomer can be improved, and the energy density is improved.

The invention provides a lithium iron phosphate material and a preparation method thereof, a positive pole piece and a secondary battery, and relates to the field of positive pole materials. The lithium iron phosphate material meets the condition that sigma b / sigma f is larger than or equal to 1.10 and smaller than or equal to 5.00, sigma b is the sample standard deviation of the circularity C of large-particle lithium iron phosphate, sigma f is the sample standard deviation of the circularity C of small-particle lithium iron phosphate, and the large-particle lithium iron phosphate and the small-particle lithium iron phosphate with different morphologies are matched with each other through the difference of the sample standard deviation of the circularity of the large-particle lithium iron phosphate and the sample standard deviation of the circularity of the small-particle lithium iron phosphate. Therefore, the lithium iron phosphate material has good tap density and specific surface area. According to the preparation method of the lithium iron phosphate material, the large-particle-size iron phosphate seed crystal partially coated with polydopamine is subjected to vacuum dehydration to obtain the modified iron phosphate seed crystal with the dehydrated surface layer, the morphology of the large-particle iron phosphate prepared by precipitation reaction is influenced, and the iron phosphate material is obtained by utilizing the large and small seed crystals through a coprecipitation method. And finally, the lithium iron phosphate material with good tap density and specific surface area is prepared.

The utility model provides a battery pole piece slitting cutting die, pole piece manufacturing equipment and a battery production line, and belongs to the technical field of batteries. The battery pole piece slitting cutter die comprises a rack, a first slitting assembly, a second slitting assembly and a cutter leaning amount detection assembly. The first slitting assembly comprises a first cutter shaft and a first slitting cutter which are erected on the rack; the second slitting assembly comprises a second cutter shaft and a second slitting cutter which are erected on the rack and are parallel to the first cutter shaft; the first cutter shaft is configured to move in the first direction parallel to the central axis of the first cutter shaft, so that the first slitting cutter can move between the first position making contact with the second slitting cutter and the second position spaced from the second slitting cutter by a preset distance. The cutter leaning amount detection assembly is used for detecting the cutter leaning amount of the first slitting cutter and the second slitting cutter in the first direction. Therefore, more convenient adjustment of the knife leaning amount can be realized, and the adjustment precision is improved, so that the slitting quality of the pole piece is improved.

The invention relates to the technical field of battery materials, in particular to a diaphragm binder composition, diaphragm binder powder, a diaphragm and a battery. The separator binder composition comprises polymer particles A and polymer particles B, the glass transition temperature Tg of the polymer particles A is-10 DEG C or below, the glass transition temperature Tg of the polymer particles B is 60 DEG C or above, the average particle size D50 of the polymer particles A is 500 nm or above, and the average particle size D50 of the polymer particles B is 300 nm or below. The diaphragm binder composition provided by the invention not only can effectively bond a pole piece and a diaphragm, but also is helpful for maintaining the uniformity and stability of a coating on the surface of the diaphragm, ensures that the diaphragm has high air permeability and good wettability to an electrolyte, and is helpful for prolonging the cycle life of a battery.

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, a negative pole piece and a packaging bag, the positive pole piece comprises a positive current collector, a positive film layer and an insulating layer, the positive current collector comprises a positive main body part and a positive tab, the positive main body part comprises a coating area and a transition area, the transition area is located at at least one end of the coating area in the first direction, the positive film layer is arranged on at least one side surface of the coating area, and the insulating layer comprises a first part; the first part is arranged on at least one side surface of the transition area; the negative pole piece comprises a negative pole film layer, the edge of the negative pole film layer exceeds the edge, close to the positive pole lug, of the first part in the first direction, a chamfer structure is arranged at the joint of the first edge and the second edge of the negative pole piece, the negative pole film layer comprises graphite, and the volume average particle size Dv50 of the graphite is 8-20 microns; and the reliability and the cycle performance of the battery monomer can be improved.

The invention belongs to the technical field of batteries, and particularly discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive pole piece, wherein the positive pole piece comprises a positive current collector and a positive film layer; the positive electrode film layer is provided with a first surface far away from the positive electrode current collector and a second surface opposite to the first surface; the distance between the first surface and the second surface is H; in the stacking direction, a region formed by extending from the second surface of the positive electrode film layer to a 0.1 * H position is marked as a first region of the positive electrode film layer; in the stacking direction, a region formed by extending from the first surface of the positive electrode film layer to a 0.1 * H position is marked as a second region of the positive electrode film layer; the types of the positive active materials in the first region and the second region can be the same or different, the positive active materials in each region are matched with the carbon nanotubes, and the direct current resistance of the battery is reduced by improving the conductivity of the pole piece.

The invention relates to the technical field of electrochemistry, and particularly discloses a positive pole piece, an electrochemical device comprising the positive pole piece and an electric device. The positive pole piece comprises a first active material with a particle size of 4-20 [mu] m and a second active material with a particle size of 200-600 nm, the first active material comprises lithium manganese iron phosphate with the manganese content of m%, the second active material comprises lithium manganese iron phosphate and / or lithium iron phosphate with the manganese content of n%, and m and n meet the condition that m-n is larger than or equal to 15 and smaller than or equal to 85. According to the invention, by controlling the particle size distribution in the positive electrode active material and the manganese content relationship, the electrochemical device containing the positive electrode plate has excellent fast charging performance and energy density.

The invention relates to a preparation method of a positive pole piece of a secondary battery, the positive pole piece is prepared by a dry process, and when process parameters meet the following formula: # imgabs0 # 0.6 * S0 < = S1 < = 1.5 * S0, the prepared positive pole piece has remarkable advantages in the aspects of electrical properties and mechanical properties.

The invention discloses a battery and an electric device. The battery comprises an outer package, an electrode assembly and an electrolyte, the electrode assembly is arranged in the inner space of the outer package, and the electrolyte is filled in the inner space of the outer package; wherein the electrode assembly comprises a pole piece, the pole piece comprises a main body part and a plurality of convex parts, each convex part is formed by a part of the pole piece protruding towards one side of the main body part, and the center-to-center distance L between every two adjacent convex parts is larger than or equal to 0.5 mm and smaller than or equal to 4.0 mm; the viscosity of the electrolyte at 25 DEG C is eta, and 3.0 < = eta / L < = 7.0, so that the distance between two adjacent convex parts is matched with the viscosity of the electrolyte, the convex parts can provide enough support for the isolating membrane, the electrolyte can smoothly flow among the convex parts, better liquid storage is realized, the infiltration effect of the electrolyte is improved, local liquid shortage is prevented, and the service life of the isolating membrane is prolonged. And the transmission effect of ions between the pole piece and the diaphragm can be improved, the charge-discharge cycle performance of the battery can be improved, the adhesion between the pole piece and the diaphragm can be improved, and the overall interface consistency of the battery can be improved.

The embodiment of the invention discloses a rolling control method and equipment based on pole piece thickness prediction and a medium. The rolling control method based on pole piece thickness prediction comprises the steps that rolling operation parameters and a data pair set corresponding to the pole piece thickness are obtained; according to the data pair set, determining a pole piece thickness prediction model capable of representing correlation characteristics between the rolling operation parameters and the pole piece thickness; inputting the current rolling operation parameters into the pole piece thickness prediction model to predict the numerical value of the current pole piece thickness; according to the difference between the numerical value of the current pole piece thickness and the target pole piece thickness threshold value, the current operation parameters of rolling are adjusted. According to the technical scheme provided by the embodiment of the invention, the thickness of the pole piece is accurately predicted through the pole piece thickness prediction model, so that the thickness consistency of the pole piece actually produced by rolling is relatively good, and the problem that the first-order optimal rate of the thickness of the pole piece is influenced due to the fact that the thickness of the pole piece manufactured by the existing pole piece manufacturing method is inconsistent is solved.

A positive electrode sheet, a secondary battery (4), and an electric device (5). The positive pole piece comprises a positive current collector; the bottom coating is positioned on at least one side of the positive current collector and comprises a conductive agent and a binder; the positive electrode active material layer is positioned on one side, far away from the positive electrode current collector, of the bottom coating layer and comprises a positive electrode active material; the thickness of the bottom coating layer is marked as L, and the thickness of the bottom coating layer meets the formula (I); wherein Dv50 is the corresponding particle size when the cumulative particle size distribution number of particles in the volume distribution of the positive electrode active material reaches 50%, and the unit is [mu] m; pD represents the compaction density of the positive pole piece, and the unit is g / cm < 3 >. # imgabs0 #

The rolling device comprises a heat conduction roller and a temperature control mechanism, and the heat conduction roller is provided with an axial end face located at the end and a radial surface located on the circumferential side; the temperature control mechanism is arranged outside the heat conduction roller and located in the axial direction and / or the radial direction of the heat conduction roller, and the temperature control mechanism is used for heating or cooling the axial end face and / or the radial surface of the heat conduction roller. The temperature control mechanism can adjust the temperature of the local deformation area of the heat conduction roller in a targeted manner, so that the surface of the heat conduction roller generates temperature change, and the temperature change can enable the heat conduction roller to generate deformation resisting deflection and thermal expansion due to thermal expansion and cold contraction, so that the problem that the thickness of the local area of a pole piece is thinned due to excessive approaching of the heat conduction roller is solved; therefore, the thickness uniformity of the rolled pole piece is improved. The thickness uniformity of the rolled pole piece is improved.

The invention discloses a high-sensitivity detection method for the safety of a battery cell, and the method comprises the following steps: S1, collecting the data of the battery cell in real time through a tunnel magnetoresistive sensor, and outputting a preliminary detection data set; s2, generating a micro-short circuit risk identification signal based on the preliminary detection data set; s3, generating a temperature anomaly distribution map by using the preliminary detection data set; s4, generating a thermal runaway early warning signal based on the temperature anomaly distribution map; s5, performing magnetic field scanning on the pole piece to generate a magnetic distortion data atlas; s6, constructing battery cell multi-source detection data, inputting the data into the physical information neural network, and training to obtain a final battery cell aging evolution model; s7, outputting a charging and discharging strategy optimization instruction based on the final cell aging evolution model; and S8, uniformly fusing the micro short circuit risk identification signal, the thermal runaway early warning signal and the charging and discharging strategy optimization instruction to generate a comprehensive response control instruction. According to the method, magnetic resistance sensing and physical modeling are fused, and intelligent prediction and response control optimization of the risk of the battery cell are realized.

The invention discloses a pole piece surface density measurement method based on a double-index model, which comprises the following steps: firstly, starting an X-ray source, and measuring the ray intensity when a pole piece is not placed; secondly, replacing standard to-be-measured pole pieces with different surface densities, and measuring ray intensity; obtaining mass attenuation coefficients corresponding to different coating surface densities according to an attenuation formula, and performing double-index model correction on the mass attenuation coefficients according to the calibration data; and finally, measuring the intensity of rays passing through the pole piece to be measured, and measuring the surface density of the pole piece according to a ray intensity attenuation model and the calibrated mass attenuation coefficient. According to the method, the surface density of the pole piece is measured by using a method for correcting the quality attenuation coefficient of the pole piece through the double-index model, and compared with a method for directly calibrating the measured ray intensity and the standard surface density value, the problem that the measurement of the surface density of the pole piece coating is affected by X-ray beam hardening and Compton scattering is solved; and the surface density measurement precision of the pole piece is improved.

The invention discloses a secondary battery and electric equipment. The secondary battery comprises an electrode assembly and a plurality of tabs, the electrode assembly comprises a plurality of pole pieces and an isolating membrane, and each pole piece is connected with one tab. And the plurality of pole pieces are composed of two outer-layer pole pieces and a plurality of inner-layer pole pieces. One of the two outer-layer pole pieces is a first pole piece, and the pole lug connected with the first pole piece is a first pole lug; the plurality of inner-layer pole pieces comprise a second pole piece, the pole lug connected with the second pole piece is a second pole lug, and the polarity of the first pole piece is the same as that of the second pole piece; and the resistance value of the second tab is greater than or equal to that of any other tab connected with the inner-layer pole piece. The first tab comprises a first part and a second part, the first part is connected with the first pole piece and the second part, the resistivity of the first part is rho1, the resistivity of the second part is rho2, rho1 is smaller than rho2, the resistance value of the first tab is R1, the resistance value of the second tab is R2, and 1.01 R2 is smaller than or equal to R1. According to the secondary battery, the current density of the first pole piece can be reduced.

The invention discloses a battery pole piece, a manufacturing method thereof and a secondary battery. The pole piece comprises a current collector and an active material layer arranged on at least one surface of the current collector, the middle part of the pole piece is provided with a pole lug groove, the pole lug groove is a non-through groove along the Y direction, the pole lug groove is provided with a pole lug, and the pole lug comprises a connecting section positioned in the pole piece and an exposed section positioned outside the pole piece. Compared with the prior art, the non-through tab groove is formed in the middle of the pole piece, and the tab is arranged in the tab groove, so that the surrounding area of the tab can be coated with the active material, the space utilization rate of the pole piece is remarkably improved, more active substances can be accommodated under the same volume, and the energy density of the battery is effectively improved; meanwhile, as the coating area of the active material is increased, the current distribution is more uniform, the internal resistance is further reduced, and the rate capability of the battery is improved.

The embodiment of the invention provides a coating deviation correction method and device. The performance of a battery can be effectively improved. The method comprises the following steps: obtaining a plurality of first distances and a plurality of second distances, each of the plurality of first distances being the distance from the edge of a coating area on a first surface of a pole piece substrate to a reference edge, each second distance in the plurality of second distances is the distance from the edge of a coating area on the second surface of the pole piece base material to the reference edge, and the plurality of first distances and the plurality of second distances are obtained by sampling for multiple times in a sampling period; and according to the multiple first distances, the multiple second distances and at least one preset deviation correction amount, the target deviation correction amount in the coating process is determined.

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, the positive pole piece comprises a positive active material, and the positive active material comprises lithium-containing phosphate and lithium-containing transition metal oxide; the electrolyte comprises a carboxylic ester solvent, and based on the total mass of the electrolyte, the mass content A of the carboxylic ester solvent meets the condition that A is larger than or equal to 20 wt% and smaller than or equal to 80 wt%. The battery monomer provided by the invention has relatively high energy density, relatively high reliability and relatively good dynamic performance.

The utility model provides a battery monomer pole piece, a battery monomer, a battery and electric equipment, and relates to the technical field of batteries. The battery monomer pole piece comprises a current collector and an active material layer, the active material layer is arranged on at least one surface of the current collector, the active material layer comprises a middle area and edge areas located on the two sides of the middle area in the first direction, each edge area comprises a thinning layer, and a conducting layer is arranged on the surface, away from the current collector, of each thinning layer. The surface, deviating from the current collector, of the conductive layer is flush with the surface, deviating from the current collector, of the middle area, lithium precipitation is not prone to occurring, and the safety risk can be reduced.

The invention provides an electrode assembly manufacturing device and method, the electrode assembly manufacturing device comprises a winding needle and a heating part, the winding needle is used for winding a pole piece and a separator and forming a winding structure, and the heating part is used for being inserted into the winding center of the winding structure and heating the winding structure. According to the manufacturing equipment, the heating component can heat the winding structure at the winding center of the winding structure, so that at least part of ion channels in the separator of the inner ring in the winding structure are fused and closed, shuttling of ions is blocked, lithium precipitation of the winding structure can be reduced, and the risk of lithium precipitation of the battery can be effectively reduced.

The invention discloses a pole piece burr detection mechanism, and relates to the field of pole piece detection. The pole piece burr detection mechanism comprises a detection cabinet and a multifunctional detection unit, wherein the multifunctional detection unit comprises a double-station material table and a combined optical detection mechanism. According to the pole piece burr detection mechanism, the burr detection station and the edge collapse detection station are designed to fix a workpiece respectively, when the pole piece burr detection mechanism is used, firstly, the sliding carrying base moves along the Y-axis sliding rail, the top shooting piece is driven to move above the workpiece, continuous picture shooting is carried out, and width dimension measurement of the workpiece is achieved; then the top shooting piece is moved to the position above the end face and bottom combined shooting piece to be combined, at the moment, burr detection and edge collapse detection can be conducted on workpieces on the burr detection station and the edge collapse detection station respectively, the overall layout is compact, centralized detection of multiple detection procedures can be achieved, the cost is reduced, and the detection time is shortened; and a multi-point lighting scheme is set, so that a shot picture is clear.

The invention discloses a single code channel absolute displacement sensor with a series structure, which is characterized in that excitation electrodes are arranged on the upper surface of a fixed ruler base body, induction electrodes are arranged on the lower surface of a movable ruler base body, the upper surface of the fixed ruler base body is uniformly divided into at least two areas along the length direction, and a group of excitation electrodes are arranged in each area; all the excitation electrodes are located on the same straight line to form a single-row structure. Each group of exciting electrodes consists of a plurality of exciting pole pieces which are uniformly distributed, the number of the exciting pole pieces is integral multiple of 4, four adjacent exciting pole pieces form an antipode, and the number of antipodes of the exciting electrodes in each area on the sizing base body is sequentially increased by one from one end to the other end. And four groups of induction electrodes with the same structure are uniformly distributed on the same straight line on the lower surface of the movable ruler base body. According to the absolute displacement time grating sensor, absolute displacement measurement can be achieved, meanwhile, a sensor structure occupying a small longitudinal space is provided, and the application field of the absolute displacement time grating sensor is widened.

A secondary battery and an electronic device. The secondary battery includes a packaging bag, an electrode assembly, and a first adhesive. The first pole piece and the second pole piece of the electrode assembly are stacked and wound. The first pole piece comprises a first current collector and a first active material layer. The first current collector includes a first surface and a second surface, the first surface facing the winding center axis. The first active material layer comprises a first sub-layer arranged on the first surface and a second sub-layer arranged on the second surface. The first current collector includes a first ending region in the winding direction. The first ending area is exposed on the first sub-layer and the second sub-layer and located at the last fold in the winding direction. The first ending area comprises a third edge, and the third edge is an ending edge of the electrode assembly. The first bonding piece is bonded with the surface, facing the electrode assembly, of the packaging bag, the surface, facing the packaging bag, of the first ending area and the third edge. Observed along the second direction, the edge, arranged along the width direction, of the first pole piece is overlapped with the first bonding piece.

The invention provides a pole piece testing method, electronic equipment and a computer readable storage medium. The method comprises the following steps: acquiring pole piece data of the battery and liquid phase conductivity of electrolyte; and performing alternating-current impedance test on the battery to obtain an alternating-current impedance spectrum of the battery. And fitting the alternating current impedance spectrum to obtain the ion impedance of the battery. And determining performance data of the pole piece according to the ion impedance, the pole piece data and the electrolyte liquid phase conductivity. And performing simulation test and experimental test on the pole piece according to the performance data to obtain simulation data and real data, comparing the simulation data with the real data, and when the difference value between the simulation data and the real data is within the error range, determining that the simulation precision meets the simulation standard. Whether the pole piece meets the design standard of the battery or not can be quickly judged, the design efficiency of the pole piece is improved, and the design robustness is enhanced.