5093 results about "Pole piece" patented technology

The invention provides a comb-shaped polymer binder, a pole piece and a battery, the comb-shaped polymer binder comprises an acrylate main chain, a flexible soft segment, a polar hard segment and a functional chain segment, the flexible soft segment, the polar hard segment and the functional chain segment are respectively grafted on the acrylate main chain, the flexible soft segment comprises an ether chain segment and / or an ester chain segment, the polar hard segment comprises a polar group and / or a first heteroaromatic ring group, and the functional chain segment comprises a functional group and a second heteroaromatic ring group. The functional chain segment comprises an aromatic ring group containing a pi-conjugated structure and / or a second heteroaromatic ring group containing a pi-conjugated structure. The comb-shaped binder adopts a structural design of'hard section anchoring + soft section buffering + functional side chain ', is helpful for enabling the binder to have high peel strength, stress buffering and electron conduction capabilities at the same time, is compatible with an existing wet coating-rolling process, is helpful for improving the peel strength and prolonging the cycle life of an electrode plate when being used for preparing the electrode plate, and is beneficial for improving the service life of the electrode plate. And the rate capability of the battery is improved.

The invention provides a pole piece and a manufacturing method thereof, a rolling system and a secondary battery, and the manufacturing method of the pole piece comprises the following steps: coating slurry on a current collector and drying to obtain a dried pole piece; the difference between the thickness of the dried pole piece and the preset thickness after rolling is used as the total rolling reduction; the dried pole piece is subjected to continuous multi-stage rolling, adjacent two-stage rolling is carried out, the percentage of the rolling reduction of the previous-stage rolling in the total rolling reduction is larger than or equal to the percentage of the rolling reduction of the next-stage rolling in the total rolling reduction, and the sum of the rolling reduction of all stages of rolling is equal to the total rolling reduction; in the multi-stage rolling, the rolling reduction of each stage of rolling is gradually reduced on the whole; and the multi-stage rolling is cold pressing. According to the manufacturing method of the pole piece, the multi-stage rolling mode is adopted, the rolling reduction decreasing and roller gap adjusting mode is adopted, the diameter, roughness and hardness of the roller body are combined to adapt to different rolling reduction, and finally the consistency of stress release and the pole piece is achieved.

The invention discloses a positive pole piece and a secondary battery, and belongs to the technical field of batteries, a positive active material in the positive pole piece comprises first lithium iron phosphate particles and second lithium iron phosphate particles; the particle diameter of the first lithium iron phosphate particles is greater than or equal to 1 mu m, and the particle diameter of the second lithium iron phosphate particles is less than or equal to 0.9 mu m; the particle diameter Dn50 of the first lithium iron phosphate particles is 1.1-3.0 [mu] m, and the particle diameter Dn50 of the second lithium iron phosphate particles is 0.25-0.65 [mu] m; the positive pole piece meets the condition that b is greater than or equal to 2 and less than or equal to 9; b is the area ratio of heat release characteristic peaks at different positions of the positive pole piece in the DSC test. Two lithium iron phosphate particles with different sizes are introduced for compounding, and meanwhile, thermal decomposition characteristic parameters of the positive pole piece are synchronously regulated and controlled, so that the low-temperature energy retention rate of the secondary battery can be improved, the thermal stability is good, and ideal high-temperature cycling stability performance is synchronously realized.

In order to solve the problem of insufficient electrolyte infiltration in the middle position of a pole piece of a winding type long and narrow battery in the prior art, the utility model provides a diaphragm and a lithium ion battery, the diaphragm comprises a base membrane layer and a PVDF (Polyvinylidene Fluoride) coating layer, the PVDF coating layer is arranged on the surface of the base membrane layer and comprises a first area and two second areas, and the first area and the second area are arranged on the surface of the base membrane layer. The first area is arranged in the middle of the diaphragm, the two second areas extend from the edge of the first area to the end part of the diaphragm in the length direction, and the porosity of the first area is greater than that of the second areas. According to the diaphragm provided by the utility model, the second region with small porosity is relatively high in overall density, so that the rigidity and the tensile resistance of the diaphragm are improved, that is, through the combination of the first region and the second region, the overall wettability of the diaphragm can be improved, and the mechanical strength of the diaphragm can be ensured; the electrochemical performance and the service life of the lithium ion battery are improved.

The invention belongs to the technical field of conductive connection, and particularly relates to an assembling mechanism for keeping combined pole pieces clamped, in particular to a pole piece assembling mechanism, an electric pile material pre-assembling device and a working method of the electric pile material pre-assembling device. Wherein the pole piece assembling mechanism is provided with an assembling plate; a rotating arm; a first lifting assembly; a second lifting assembly; the pressing frame is provided with a square opening matched with the pressing plate. And elastic anti-clamping pieces are embedded in the side walls of the pressing plates. The elastic anti-clamping piece is arranged on the side wall of the pressing plate, so that when the pressing frame is separated from the pressing plate, the elastic anti-clamping piece can automatically and dynamically adjust the levelness of the pole piece frame falling into the pressing plate, and the problem that the pole piece frame is inclined and clamped is effectively avoided; when the pressing frame and the pressing plate are pressed in a matched mode, the elastic anti-clamping piece is pressed to retract, accurate assembly of the pole piece frame and the membrane electrode is guaranteed, pole piece damage caused by rigid contact is prevented through the elastic buffering effect, and therefore the assembly yield of the galvanic pile pole piece is remarkably increased.

The utility model relates to a belt conveying mechanism which comprises a first vacuum belt assembly, a second vacuum belt assembly, a third vacuum belt assembly, a fourth vacuum belt assembly and a brush dust removal assembly. The first vacuum belt assembly, the second vacuum belt assembly, the third vacuum belt assembly and the fourth vacuum belt assembly are sequentially connected end to end, and the brush dust removal assembly is installed at the lower end of the first vacuum belt assembly and the lower end of the third vacuum belt assembly. According to the belt conveying mechanism, the first vacuum belt assembly, the second vacuum belt assembly, the third vacuum belt assembly and the fourth vacuum belt assembly convey the pole pieces in an adsorption mode, the pole pieces are conveyed through belt transmission, dust generated by friction between the belt and the pole pieces is reduced, and the qualification rate of battery cell production is increased.

The invention relates to the technical field of lithium battery cell online nondestructive testing, and discloses a lithium battery cell lamination process online quality detection method, which is used for solving the problems of high difficulty in real-time online identification of hidden defects in a lithium battery cell lamination process and high omission ratio in a traditional method. The method comprises the following steps: firstly, synchronously acquiring an optical image of the surface of a pole piece and an X-ray perspective image of an internal structure on a lamination production line to obtain a multi-modal image sequence, carrying out time sequence registration and space alignment fusion on the two types of images, and extracting a pole piece layer, a diaphragm layer boundary and a density abnormal region; according to the method, an S-shaped deformation template and an internal foreign matter template are combined to carry out mode comparison, three-dimensional coordinate positioning, density grading and severity marking are carried out on an abnormal area, a structured abnormal catalogue is fed back to a production line control system, technological parameters are adjusted in a linkage mode, online nondestructive testing and closed-loop regulation and control of hidden defects are achieved, and the production efficiency is improved. The omission ratio is reduced; and the consistency and the safety of the lamination process are improved.

The invention discloses a novel lithium battery pole piece coating machine, which belongs to the technical field of coating machines, and comprises a coating machine body, and an unwinding device, a scratch monitoring device, a tensioning device, a sectional rolling assembly, a cutter assembly, a continuous rolling assembly, a coating assembly and a winding device which are sequentially arranged in the winding direction of a pole piece from front to back, the scratch monitoring device comprises a supporting rod fixed to the coating machine body, the length direction of the supporting rod is consistent with the width direction of the pole piece, and a plurality of linear array cameras are evenly arranged on the lower side of the supporting rod in the length direction at intervals; the sectional type rolling assembly comprises a main motor, an output shaft and a pressing roller, the output shaft comprises multiple sections of supporting shafts which are sequentially connected in the axial direction, and the two ends of each supporting shaft are connected with a first hinge joint and a second hinge joint correspondingly. According to the lithium battery pole piece coating device, protrusions and recesses on the surface of the lithium battery pole piece can be treated in time, and the uniformity of the subsequent pole piece during coating is improved.

The invention belongs to the technical field of batteries, and discloses a battery pack, which comprises a battery, a bottom plate and an adhesive layer, the battery is fixedly arranged on the bottom plate through the adhesive layer, the battery comprises a shell, an insulating part and a battery cell, the battery cell is arranged in the shell and comprises a plurality of pole pieces, the insulating part covers the outer surface of the shell, and the insulating part covers the outer surface of the shell. The surface, facing the bottom plate, of the shell is a shell bottom surface, the insulating part is provided with an opening at least partially exposed out of the shell bottom surface, and the part, exposed out of the opening, of the shell bottom surface is bonded with the adhesive layer; the minimum distance between the pole piece and the bottom face of the shell is a mm, the minimum distance between the opening of the insulating part and the bottom plate is b mm, and the range of the product of a and b is 1-18. The battery pack provided by the invention has relatively high energy density, relatively good insulation performance and relatively good heat dissipation performance.

The utility model discloses a laminated battery cell and preparation equipment thereof, the laminated battery cell is prepared by folding a battery cell structure, the battery cell structure comprises a first pole piece, a diaphragm and a second pole piece, the first pole piece is located on one side of the diaphragm, and the first pole piece is connected with the diaphragm through a normal-temperature normal-pressure conductive adhesive; and the second pole pieces are alternately arranged on the sides, away from the first pole pieces, of the diaphragms, and the second pole pieces are connected with the diaphragms through normal-temperature and normal-pressure conductive adhesives. The normal-temperature and normal-pressure conductive adhesive disclosed by the utility model has relatively good adhesion performance at normal temperature and normal pressure, and also has relatively good conductivity, so that the problem of poor battery performance caused by high-temperature and high-pressure thermal compounding of a pole piece and a diaphragm in the existing laminated cell processing process is solved, the condition of poor liquid absorption effect and interface of the battery is improved, and the service life of the battery is prolonged. And the battery performance is improved.

The invention provides a winding needle structure and winding equipment, the winding needle structure is used for winding a laminated diaphragm and a pole piece into an electrode assembly, the winding needle structure comprises a winding body, and the winding body is provided with a negative pressure cavity and a peripheral surface. A winding area and at least one adsorption area are distributed on the peripheral surface of the winding body in the circumferential direction of the winding body; a plurality of first adsorption holes communicated with the negative pressure cavity are formed in the rolling area, adsorption force can be generated at the first adsorption holes, the rolling position of the diaphragm can be adsorbed to the rolling area, and the rolling area is only used for adsorbing the rolling position of the diaphragm; a plurality of second adsorption holes communicated with the negative pressure cavity are formed in the adsorption area, adsorption force can be generated at the second adsorption holes, and at least one of the diaphragm and the laminated layer can be adsorbed to the adsorption area; wherein the sum of the adsorption forces of all the first adsorption holes in the rolling area is greater than the sum of the adsorption forces of all the second adsorption holes in the adsorption area. Large adsorption force can be distributed to the winding position of the diaphragm, so that the problem that the diaphragm is prone to slipping and wrinkling when the electrode assembly is manufactured is solved.

The invention discloses a method for retarding black spot wrinkles of a PMMA (Polymethyl Methacrylate) gluing diaphragm lithium battery pole piece, which comprises the following steps: S1, adjusting parameters of a winding machine, adjusting the distance between pole pieces and tabs according to different parameters, and winding a battery cell; s2, performing hot pressing on the wound roll core by using different hot pressing parameters; s3, the hot-pressed roll core is assembled, put into a shell and fully charged in a capacity grading mode; wherein the parameter of the winding machine is embossing pressure; the hot pressing parameters comprise temperature, pressure and time. Therefore, by selecting the most appropriate embossing pressure and hot pressing parameter, black spots and wrinkles on the lithium battery interface of the PMMA glued diaphragm can be relieved, so that the electrochemical performance and the safety performance of the battery are improved.

The utility model provides an all-solid-state battery capable of preventing short circuit, and belongs to the technical field of all-solid-state batteries. The all-solid-state battery comprises a solid electrolyte layer, positive plates and negative plates, the positive plates and the negative plates are alternately stacked, the solid electrolyte layer is arranged between the positive plates and the negative plates, an insulating frame layer is further arranged between the positive plates and the negative plates, and the insulating frame layer is of a hollow quadrilateral frame structure. The inner frame is smaller than the positive plate, and the outer frame is larger than the positive plate. The lithium ion battery can prevent the structural integrity of the electrolyte layer from being damaged by the shearing effect generated by the edge of the pole piece under high voltage, so that the battery is short-circuited due to contact of the positive and negative pole pieces, the yield of the lithium ion battery is obviously improved, the short-circuit rate of the battery is reduced, and the cycle performance of the battery is improved.

The invention belongs to the technical field of batteries, and discloses a battery pack, which comprises a battery, a bottom plate and an adhesive layer, the battery is fixedly arranged on the bottom plate through the adhesive layer, the battery comprises a shell, an insulating part and a battery cell, the battery cell is arranged in the shell and comprises a plurality of pole pieces, the insulating part covers the outer surface of the shell, and the insulating part covers the outer surface of the shell. The surface, facing the bottom plate, of the shell is a shell bottom surface, the insulating part is provided with an opening at least partially exposed out of the shell bottom surface, and the part, exposed out of the opening, of the shell bottom surface is bonded with the adhesive layer; the minimum distance between the pole piece and the bottom face of the shell is a mm, the minimum distance between the opening of the insulating part and the bottom plate is b mm, and the range of the product of a and b is 1-18. The battery pack provided by the invention has relatively high energy density, relatively good insulation performance and relatively good heat dissipation performance.

The invention discloses a sodium-ion battery negative pole piece, a preparation method, a sodium-ion battery and an electric device, the negative pole piece has a layered structure, that is, the negative pole piece comprises a first active layer and a second active layer, and the average interlayer spacing and gram volume of active substance materials in the two active layers meet a certain relational expression. Through the layered design of the pole piece and the specific matching of the active material in the active layer, the sodium-ion battery can give consideration to high gram volume and dynamic performance, the gram volume loss is small, and the dynamic performance is high, so that the comprehensive performance optimization of the sodium-ion battery is realized.

The invention discloses a circuit breaker integrated with an adjustable hydraulic release. The circuit breaker comprises a circuit breaker body, wherein the adjustable hydraulic release, a release transmission mechanism and a main contact system are arranged in the circuit breaker body. The adjustable hydraulic release comprises a release body and an intelligent control module; the tripper body is provided with an oil cup, an oil cup iron core capable of axially moving, a pole shoe, a first coil and an armature, and the armature is linked with the tripping transmission mechanism. When the first coil is electrified, a first electromagnetic force is generated to push the oil cup iron core to move towards the pole shoe and finally attract the armature to trigger a tripping action so as to break a circuit. The intelligent control module is located at the end of the oil cup and can generate second electromagnetic force in the same direction or reverse direction as the first electromagnetic force to act on the oil cup iron core, and rated current adjustment and overload protection adjustment are achieved. According to the design, the problem that the protection characteristic of a traditional hydraulic electromagnetic release is fixed is solved, the number of synthesized ampere turns is equivalently changed through controllable second electromagnetic force, the rated current is flexibly adjusted, and the requirements of different devices are met.

The invention provides a pole piece, a battery and an electronic device, the pole piece comprises: a current collector, the current collector comprises a coated area and an uncoated area, the coated area comprises an active material layer, a first insulation part and a second insulation part which are arranged along a preset direction on at least one surface of the current collector in the thickness direction and are sequentially and adjacently arranged; in the thickness direction of the current collector, the thickness of the first insulating part is greater than that of the second insulating part, and the first insulating part comprises a first insulating layer and a second insulating layer coated on the first insulating layer; in the preset direction, the width of the uncoated area is W1mm, the width of the first insulating part is W2mm, and W1 / W2 is larger than or equal to 1.5 and smaller than or equal to 10. According to the pole piece, the battery and the electronic device provided by the invention, on the premise of reducing wrinkles and folding of the uncoated area, the uncoated area has enough width to be assembled with other structures in the battery.

The invention provides a tritium radiation volt isotope battery. The tritium radiation volt isotope battery comprises a shell and a stacking structure, the shell is provided with an accommodating cavity; the stacked structure is arranged in the containing cavity and comprises a positive pole piece, a semiconductor transduction layer and a negative pole piece which are arranged in a stacked mode, the semiconductor transduction layer is arranged to be an array formed by columnar nano particles, liquid tritides are distributed on the surfaces of the columnar nano particles, and the liquid tritides comprise all-tritiated N-ethyl carbazole and / or all-tritiated N-ethyl carbazole and / or all-tritiated N-ethyl carbazole and / or all-tritiated N-ethyl carbazole and / or all-tritiated N-ethyl carbazole and / or all-tritiated N-ethyl carbazole. And part of tritiated N-ethyl carbazole. The radiation volt isotope battery has improved energy conversion efficiency.

The invention discloses an adjustable oil damping electromagnetic release applied to a circuit breaker, and belongs to the technical field of release. Comprising an oil cup, an oil cup iron core capable of moving in the axial direction, a pole shoe arranged at the end of the oil cup and a first coil wound around the outer wall of the oil cup, and when the first coil is powered on, first electromagnetic force driving the oil cup iron core to move towards the pole shoe is generated; and the intelligent control module is arranged at the end part of the oil cup and is used for outputting controllable direct current to generate second electromagnetic force in the same direction or opposite direction as the first electromagnetic force, and the release has a rated current adjusting function and an overload protection adjusting function by adjusting the magnitude and the direction of the second electromagnetic force. The controllable second electromagnetic force is introduced into a traditional oil damping electromagnetic release, the rated current specification can be adjusted, the release action time can be adjusted, the advantage that the temperature stability of the oil damping release is good is reserved, and meanwhile the defect that the protection characteristic of the oil damping release cannot be adjusted is overcome.

The invention discloses pole piece processing equipment, and relates to the technical field of battery pole piece processing, and the pole piece processing equipment is characterized in that a conveying device conveys a pole piece material belt to pass through a cleaning position, a film covering position and a glue dispensing position in sequence; the laser assembly is arranged at the cleaning position and used for cleaning a pole piece material belt and forming a plurality of pole lug grooves, and each pole lug groove is provided with a dispensing forming area; the film covering device comprises a film supply assembly and an isolating film, the film supply assembly is arranged at the film covering position and used for providing the isolating film, the isolating film and the pole piece material belt move synchronously and are attached to the pole piece material belt, a plurality of through holes are formed in the isolating film, and the through holes are matched with the dispensing forming areas in a one-to-one correspondence mode; the glue dispensing mechanism is arranged at the glue dispensing position and used for spraying glue, the glue covers the glue dispensing forming area, at least part of the glue extends to the isolating membrane, and the glue is formed into a glue layer in the glue dispensing forming area. The pole piece processing equipment provided by the technical scheme of the invention can control the shape of the adhesive layer and improve the quality of the battery.

The invention provides an electrochemical device and an electronic device comprising the same, the electrochemical device comprises a positive pole piece, the positive pole piece comprises a current collector and a positive pole material layer located on at least one surface of the current collector in the thickness direction, the positive pole material layer comprises a first positive pole material layer and a second positive pole material layer, the second positive electrode material layer is located between the first positive electrode material layer and the current collector, the positive electrode material layer comprises a positive electrode active material, the positive electrode active material comprises two or more than two nickel cobalt lithium manganate ternary materials, the two or more than two nickel cobalt lithium manganate ternary materials are divided into two groups, the chemical formula of the first group of lithium nickel cobalt manganate ternary materials is Lin1Nix1Coy1Mnz1M1m1O2, x1 + y1 + z1 + m1 is equal to 1 and smaller than or equal to 0.60, the chemical formula of the second group of lithium nickel cobalt manganate ternary materials is Lin2Nix2Coy2Mnz2M2m2O2, x2 + y2 + z2 + m2 is equal to 1 and larger than 0 and smaller than or equal to 0.14, and the two groups of lithium nickel cobalt manganate ternary materials are located in the first positive electrode material layer and the second positive electrode material layer respectively.

The invention discloses a solid-state battery, an electrode layer, a battery cell, a single battery and electric equipment, the solid-state battery is composed of a solid-state positive pole piece, a solid-state electrolyte layer and a solid-state negative pole piece, the edges (at least one pole piece) of the positive pole piece and the negative pole piece contain an insulating coating, and the solid-state electrolyte layer can contain or does not contain the insulating coating; the short-circuit risk of the solid-state battery due to dislocation of positive and negative plates is solved, the problems of powder falling and material falling at the edges of positive and negative electrodes and electrolyte of the solid-state battery can be solved, particles are prevented from entering the battery, and the safety is further improved.

The invention discloses a dry-method electrode film rolling compounding method and dry-method electrode film rolling equipment. The method comprises the following steps: leading out a current collector film from an unpowered unreeling shaft, forming a suspension arc by virtue of self weight, and penetrating through a first roller gap; synchronously unrolling the two dry-method electrode films in an unpowered manner, so that the two dry-method electrode films enter the first roller gap in a self-weight overhanging state and are attached to the two surfaces of the current collector film to form an initial complex; coating the outer side of the initial complex with an isolating membrane to obtain a to-be-heated complex, and enabling the to-be-heated complex to enter a second roller gap after the to-be-heated complex is overhung by self weight; the to-be-heated composite body is subjected to hot-pressing compounding through compounding rollers on the two sides of the second roller gap; and then stripping the isolating membrane and rolling the double-sided dry-method pole piece. According to the method, near-zero tension conveying is achieved through natural suspension, and by matching with isolation film wrapping and one-time double-face pressing of the hot-pressing roller, edge micro-cracking and whole belt breakage of the dry-method electrode film can be effectively avoided, and the interface density and the roll-to-roll production yield are improved.

The invention discloses a method for separating, purifying and regenerating waste battery negative electrode powder, which belongs to the field of battery recycling and regenerating, and mainly comprises the following process steps of: ball-milling and screening waste battery negative electrode pieces into certain granularity, soaking the waste battery negative electrode pieces in alkali liquor and an impurity removal agent, and stirring for reaction and separation to obtain a negative electrode powder wet material and a copper ion solution; carrying out drying demagnetization and infrared irradiation treatment on the wet negative electrode powder to obtain regenerated negative electrode powder; and the copper ion solution is subjected to extraction, back extraction and reduction to obtain crude copper, and the crude copper is subjected to vacuum distillation to obtain an electronic-grade copper product. Wherein the impurity removal agent comprises an oxidizing agent, the oxidizing agent oxidizes elemental copper and forms soluble substances under the action of alkali liquor, and the excellent separation effect is achieved. The negative electrode powder treatment comprises infrared irradiation treatment, decomposition of an adhesive can be achieved through the dual effects of heat irradiation and heat conduction, the volume heating effect is formed through scattering, surface crusting is effectively avoided, the adhesive can be efficiently removed, and the quality and the recycling efficiency of the regenerated negative electrode powder are guaranteed.

The invention relates to the technical field of magnesium secondary battery cells, and particularly discloses a magnesium battery tab. Comprising at least two main body parts, a buffer part is arranged between every two adjacent main body parts, the thickness of each buffer part is smaller than that of each main body part, the thickness difference between each buffer part and each main body part is Dn, and Dn is larger than or equal to D / 10 and smaller than or equal to D / 4. According to the invention, the problem of high welding difficulty of multiple layers of pole pieces in the magnesium secondary battery is solved.

The invention discloses an automatic lamination device for soft package lithium battery pole pieces, and relates to the field of battery lamination equipment, the automatic lamination device comprises a lamination table and material tables symmetrically distributed on the two sides of the lamination table, and further comprises a reciprocating motion mechanism, and the reciprocating motion mechanism is connected with two sets of material taking assemblies and a set of material guiding roller pieces; the reciprocating motion mechanism drives the two sets of material taking assemblies to alternately take materials from the material table and convey the materials to the lamination table, the reciprocating motion mechanism drives the material guiding roller piece to guide a diaphragm in a reciprocating mode, and four sets of displacement assemblies are symmetrically arranged on the front side and the rear side of the lamination table. The two suckers are pushed by the connecting rod to flatten and compact the middle position of an electrode slice towards two sides, and when the pressing claw presses and positions the electrode slice, the edge part of the electrode slice is laterally flattened and compacted by the pressing claw through inclined guiding of the sliding groove, so that the whole electrode slice is tensioned and flattened, the electrode slice is effectively prevented from wrinkling and deforming, and the molding quality of a battery core lamination is improved.

The invention provides a composite binder, a preparation method thereof and an electrochemical device. The composite binder has a core-shell structure; wherein the core of the core-shell structure is a phase change material, and the phase change temperature of the phase change material is-10 DEG C to 70 DEG C; and the shell of the core-shell structure is a polymer binder. The preparation method comprises the following steps: carrying out shearing treatment on a mixture of an oil phase and a water phase, and carrying out polymerization reaction, wherein the oil phase comprises a phase change material and a raw material of a polymer binder, and the raw material of the polymer binder at least comprises a monomer; the aqueous phase includes water and an emulsifier. When the obtained composite binder is applied to an electrochemical device (such as a battery), the inherent binding performance can be maintained, meanwhile, the thermal environment of a pole piece is regulated and controlled according to needs, and the high and low temperature, fast charging, safety and other performance of a battery cell are improved.

The invention provides a preparation method of a bipolar current collector based on a selective double-sided modified masking film. The preparation method comprises the following steps: depositing a Ni-Cr alloy layer on a single side surface of an aluminum substrate; one side of the masking film is etched to form a roughened surface, and the other side of the masking film is hydrophobic to form a hydrophobic surface; the roughened surface of the masking film and the surface, without the Ni-Cr alloy layer, of the aluminum matrix are pressed, and the edge is coated with curing glue; and placing the pressed and glued sample in an electroplating solution to electroplate a copper layer, finally cutting off an edge glue sealing area, and stripping the masking film. According to the preparation method, the masking film used for protecting the back surface of the aluminum substrate is subjected to double-sided differential treatment, the edge sealing technology is matched, and the Ni-Cr alloy is adopted for bottoming, so that the adhesive force between the copper plating layer and the aluminum substrate is improved, the risk of causing corrosion of a primary battery is reduced, the bipolar current collector which is firmly combined and has a pure interface can be prepared, and the service life of the bipolar current collector is prolonged. And a feasible solution is provided for realizing light-weight and high-performance current collectors for electronic devices such as lithium batteries and the like.

The invention relates to the technical field of lithium battery processing, in particular to a semi-solid lithium ion battery core lamination correction device which comprises a rack, a pole piece correction mechanism, a negative pressure adsorption mechanism and a manipulator. During working, the manipulator places a pole piece on the correction platform, and the sensor detects the position deviation of the pole piece; then, a first alignment module and a second alignment module of the pole piece correction mechanism alternately move in the diagonal direction of the correction platform, force is sequentially applied to the two adjacent sides of the pole piece, and the pole piece is gradually corrected to the reference position. After correction, the surface state of the pole piece is detected through a laser sensor or a CCD, and if warping exists, the negative pressure adsorption mechanism applies uniform adsorption force through the negative pressure holes in the correction platform, so that the pole piece is flatly attached to the table top. According to the device, position correction and surface leveling are carried out step by step, action interference is prevented, the control precision and reliability are improved, meanwhile, metal scraps on the surfaces of pole pieces can be removed through negative pressure adsorption, the uniformity of the internal structure of a laminated battery cell is effectively improved, and the performance and the service life of the battery are improved.

The invention relates to the technical field of lithium ion battery manufacturing, and discloses a homogenate feeding design method and device of a lithium ion battery and a computer storage medium, the method comprises the following steps: based on basic characteristic data of different types of raw materials of the lithium ion battery, constructing a non-uniformity characterization model of a mixture and obtaining a non-uniformity characterization result; and inputting the non-uniformity characterization result into a finite element model of the battery pole piece, and solving the finite element model in combination with an applied load and a boundary condition to obtain an internal cracking behavior simulation result of the mixture under different working conditions. And constructing an optimization model which takes the homogenate feeding scheme as a design variable, takes a design target as a target function and meets design constraint conditions, and solving to obtain a target homogenate feeding design scheme. The problems of neglecting of non-uniformity and cracking of the mixture in a traditional mode can be solved, the risks of stress concentration and capacity fading in the battery are reduced, homogenate feeding is more scientific and accurate, and the performance and reliability of the battery are improved.