604results about How to "Increase energy density" patented technology

The invention provides a composite connection method for thick titanium alloy plates, and belongs to the technical field of metal material welding and additive manufacturing. According to the technical scheme, the method comprises the steps that symmetrical X-shaped grooves are machined in thick plate titanium alloy workpieces to be connected; a laser-electric arc hybrid welding system is adopted for conducting double-face bottoming welding on the X-shaped groove, so that a double-face bottoming welding seam is formed; and a powder feeding type laser cladding system is adopted, and multi-layer and multi-channel additive filling is conducted in the X-shaped groove above the double-face bottoming welding seam. According to the method, efficient laser-electric arc composite bottoming and low-heat-input laser cladding additive filling are separated, high-quality penetration of the root is guaranteed firstly, then welding deformation and residual stress are remarkably reduced through low-heat-input filling, the microstructure of a filling area is optimized, and therefore a welded joint with excellent comprehensive performance is obtained.

The application discloses a high-energy-density battery box, which comprises a box frame, a liquid cooling plate is installed at the bottom of the box frame, and a plurality of protective plates are installed below the liquid cooling plate; a top cover plate is installed at the top of the box frame, and a box inner cavity for accommodating an electric core module is formed between the top cover plate and the liquid cooling plate; the box frame is composed of a plurality of frame edges, at least one side frame edge of the box frame is a side vertical assembly frame edge, at least one side of the top cover plate is provided with a side cover plate, and the side cover plate corresponds to the side vertical assembly frame edge; an outer side vertical surface of the side vertical assembly frame edge is an assembly surface matched with the side cover plate, and the side cover plate is attached to the outer side vertical surface. The box frame is a square frame, the left and right side frame edges of the box frame are side vertical assembly frame edges, and panels are installed at the front and back of the box frame; an upper profile surface of the panel is an assembly surface matched with the top cover plate, and a side profile surface of the panel is an assembly surface matched with the side cover plate. The application can improve the energy density of the battery box.

The application provides a high-energy-density high-safety tab-free lithium ion battery, which comprises an outer shell and an electric core, and a cover plate is arranged on the top of the outer shell; the electric core is composed of positive electrode sheets and negative electrode sheets which are separated by a diaphragm and are wound; the positive electrode sheets and the negative electrode sheets are respectively designed as wide-width reduced empty foil areas, and the empty foil areas of the positive electrode sheets and the negative electrode sheets form gap areas with intervals on the surface of the electric core through the reduced-width parts after winding, and the positive electrode sheet empty foil areas and the negative electrode sheet empty foil areas are respectively formed on the two sides of the gap areas; the outer shell has shell areas composed of different materials, including a first metal shell area, an insulating connection area and a second metal shell area arranged in sequence, and the positive electrode sheet empty foil areas and the negative electrode sheet empty foil areas of the electric core respectively fall into the first metal shell area and the second metal shell area in the whole, and the insulating connection area falls into the gap area of the electric core. The application greatly improves and improves the energy density and thermal runaway.

The invention provides a carbonaceous material and a preparation method thereof, and a negative pole piece, a secondary battery and an electric device containing the carbonaceous material, after the carbonaceous material is subjected to an adsorption test for 100 hours by adopting water vapor under the conditions of 25 DEG C and 100% RH constant temperature and humidity, the adsorption mass of the water vapor is recorded as A, the initial mass of the carbonaceous material is recorded as B, and A / B is greater than or equal to 0.13 and less than or equal to 0.50. The capacity and the first coulombic efficiency of the carbonaceous material can be improved at the same time.

This invention belongs to the field of sodium-ion batteries, and relates to a fluorophenylphosphonate, its preparation method, and its application in sodium-ion batteries. The fluorophenylphosphonate includes di(trifluoroisopropyl)phenylphosphonate or di(hexafluoroisopropyl)phenylphosphonate; the preparation steps are as follows: using fluoroalcohol and phenylphosphonyl dichloride as raw materials, triethylamine as an acid-binding agent, and diethyl ether as a reaction solvent, the fluorophenylphosphonate is prepared by a condensation substitution reaction. Sodium-ion batteries prepared using fluorophenylphosphonate exhibit high ionic conductivity and an electrochemical stability window. This phosphonate additive preferentially decomposes at the electrode interface, inducing the formation of a thin, dense, uniform electrode-electrolyte interface phase rich in NaF inorganic components, and giving the electrolyte excellent flame-retardant properties. Sodium-ion batteries assembled with positive electrode materials exhibit good rate performance and cycle stability, with a cycle life exceeding 5000 cycles at room temperature. Simultaneously, this electrolyte also exhibits excellent cycle performance at a high temperature of 60°C.

Examples of the present application provide a charging method for a secondary battery, a charging apparatus for a secondary battery, a charging device, and a computer storage medium. The method includes: acquiring a first state of health SOH1 of the secondary battery when the secondary battery is at a preset charging node; activating the lithium-supplementing material when the SOH1 is less than or equal to a first threshold, to supplement lithium for the secondary battery; performing a first charging process on the secondary battery; determining a second state of health SOH2 of the secondary battery based on a working parameter of the secondary battery in the first charging process; and charging the secondary battery when the SOH2 is greater than a second threshold.

The application provides a biomass-based composite electrode material, an electrode sheet and a hybrid supercapacitor, and belongs to the technical field of electrochemical energy storage. 3 The biomass-based composite electrode material comprises: a biomass-derived porous carbon matrix, pores with multiple pore sizes, the volume of the pores is 0.7-1.7 cm 2 / g; and nickel-cobalt layered double hydroxide nanosheets vertically anchored on the surface of the biomass-derived porous carbon matrix; the specific surface area of the composite electrode material is 900-1400 m 2 / g. The biomass-based composite electrode material of the application significantly improves the ion adsorption and charge storage capacity. In addition, the electrode material is applied in a capacitor, which effectively improves the energy density, electrode conductivity and cycle stability of the supercapacitor.

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

The invention provides a composite positive plate, a preparation method thereof and a battery, and belongs to the technical field of batteries. The interface conductive layer is arranged on at least one side of the positive electrode active material layer, and the interface conductive layer comprises conductive filler and an elastic matrix. According to the composite positive plate, the interface conductive layer with conductivity, flexibility and elasticity is arranged on at least one side of the positive active material layer, so that when the composite positive plate is applied to the battery and the interface conductive layer is close to one side of the diaphragm, not only can the interface impedance be reduced, but also the wettability of electrolyte on the positive active material layer can be improved; when the interface conducting layer is close to one side of the shell, the positive electrode active material layer can be better protected, extrusion damage of the shell to the positive electrode active material layer is reduced, the interface conducting layer can serve as a current collector, the electrochemical performance of the battery is improved, and the interface conducting layer can adapt to volume expansion of the composite positive plate in the charging and discharging process of the battery and improve the cycle performance of the battery.

The invention relates to the technical field of solid-state batteries, in particular to a porous silicon carbon-metal composite negative electrode material and a solid-state battery. The porous carbon skeleton comprises a first hole, a second hole and a third hole; the aperture d1 of the first hole is greater than or equal to 5nm and less than or equal to 20nm; the aperture of the second hole is d2, and d2 is more than 25nm and less than or equal to 50nm; the aperture of the third hole is d3, and d3 is more than 80nm and less than or equal to 200nm; at least nanometer silicon particles are arranged in the first holes, and at least metal particles are arranged in the second holes and the third holes. According to the porous silicon carbon-metal composite negative electrode material, through the partition design of the gradient porous framework, the silicon locking function is achieved through the first holes, the stress buffer area effect is achieved through the second holes / third holes, the problem that the volume of a negative electrode with the large silicon loading capacity is seriously expanded can be remarkably solved, the silicon loading limit of a traditional single micropore structure is broken through, and the service life of the negative electrode is prolonged. And the energy density and the cycling stability of the battery are obviously improved.

The application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell with a first wall, a first electrode terminal arranged on the first wall, an electrode assembly accommodated in the shell, a first adapter and a first insulating piece. The electrode assembly comprises a main body and a first tab connected to the main body. The first adapter connects the first electrode terminal and the first tab. In the thickness direction of the first wall, at least part of the first insulating piece is arranged between the main body and the first wall, and a part of the first tab is located on the side of the first insulating piece away from the main body. In the same plane perpendicular to the thickness direction, the orthographic projection of the first electrode terminal and the orthographic projection of the first insulating piece do not overlap, and in the direction of the main body pointing to the first wall, a part of the first insulating piece protrudes from the first surface of the first electrode terminal close to the main body. The first insulating piece and the first electrode terminal can share part of the space, which is beneficial to improving the space utilization and improving the energy density.

The application relates to the technical field of electric tools, in particular to a battery cell containing structure and a soft package battery. The battery cell containing structure comprises a first half shell and a mounting bracket. The first half shell is provided with a bottom plate and a shell side wall connected with each other. The mounting bracket comprises a mounting partition plate and a first side plate connected with the mounting partition plate perpendicularly. The mounting partition plate is parallel and spaced apart from the bottom plate, and the first side plate extends towards the bottom plate. The mounting partition plate, the bottom plate and the first side plate enclose a containing cavity for containing a soft package battery cell. The surfaces of the mounting partition plate and the bottom plate facing the containing cavity extend horizontally, and the surface of the first side plate facing the containing cavity extends vertically. The application effectively physically restricts the soft package battery cell, avoids position deviation or collision of the soft package battery cell, improves the stability and service life of the battery, and improves the space utilization of the battery to a certain extent.

The application discloses a low-reversibility lithium iron phosphate precursor prepared by a reaction type emulsion method and a preparation method and application thereof. The lithium iron phosphate precursor material meets the following two conditions: ①2.44-2.86 g / cm 3 , and ②0.4<=<=2.5, wherein C is an average circularity, the circularity=(4*π*A) / G 2 ; wherein ρ is the density of the lithium iron phosphate precursor material measured by a gas displacement method, K 90 =(Dv90-Dv10) / Dv50, A is the projected area of a particle sample of the lithium iron phosphate precursor material, and G is the projected perimeter of the particle sample of the lithium iron phosphate precursor material. The lithium iron phosphate precursor material has a high tap density and good processing performance, the lithium iron phosphate prepared by a carbon reduction method from the lithium iron phosphate precursor material has a high tap density, thereby having a high volume specific capacity, and the prepared battery has a high energy density.

This invention relates to the field of power management technology, and particularly to an intelligent integrated power system and control method based on multi-source collaboration, including a main power module, a backup power cluster, an energy management unit, a voltage adaptation module, a status monitoring unit, a communication module, and a load interface. Compared to existing technologies that typically use a single type of battery pack as a backup power source, which suffers from slow response speed and difficulty in withstanding instantaneous high-power surges, this invention employs a heterogeneous energy storage system composed of parallel lithium battery packs and supercapacitor modules as the backup power cluster, and uses a bidirectional DC / DC converter for intelligent control. This solution fully leverages the different advantages of lithium batteries (high energy density) and supercapacitors (high power density and rapid response), enabling the system to provide both long-term backup power support and instantaneous high-power discharge, thereby significantly improving the dynamic response capability, power support reliability, and overall service life of the backup power source.

The invention relates to a positive electrode active material and a preparation method thereof, a positive electrode and a lithium ion battery. The positive electrode active material comprises lithium manganate particles and a sodium phytate layer coating the surfaces of the lithium manganate particles. According to the technical scheme, in the positive electrode active material, the sodium phytate layer serves as a coating layer, and six phosphate groups in molecules of the sodium phytate layer and manganese ions dissolved out of lithium manganate particles can form a stable complex, so that the dissolved-out manganese ions are efficiently captured and prevented from being further migrated into an electrolyte to damage the performance of a battery; meanwhile, the sodium phytate layer forms a layer of compact physical barrier on the surfaces of the lithium manganate particles, so that direct contact between the lithium manganate particles and an electrolyte can be effectively blocked, and dissolution of manganese ions is inhibited from the source. Through a synergistic effect of a chelation effect and a physical barrier effect of the sodium phytate layer, the dissolution amount of manganese ions can be remarkably reduced, and the crystal structure of lithium manganate particles is prevented from being distorted, so that the structural stability of the positive electrode active material is improved.

The invention discloses a liquid cooling energy storage cabinet which comprises a main frame, the interior of the main frame is divided into an energy bin and an electric appliance bin which are mutually independent through a vertically-arranged partition plate, a battery rack is arranged in the energy bin, battery packs are detachably installed in the battery rack, a liquid cooling plate is tightly attached to the side face of each battery pack, and a flow channel is formed in each liquid cooling plate. The flow channels of the adjacent liquid cooling plates are connected in series through liquid cooling pipelines; an inlet and an outlet of the liquid cooling pipeline both extend to the electric appliance bin and are connected with an outlet and an inlet of the liquid cooling unit respectively, and the liquid cooling unit is fixed to a bottom plate of the electric appliance bin through a liquid cooling air conditioner support. Through the design that the liquid cooling plate is directly attached to the side face of the battery pack, the heat conduction path is extremely short, the advantages of high specific heat capacity and high heat conductivity of liquid are utilized, heat generated during charging and discharging of the battery can be rapidly and efficiently taken away, and the problem of low heat dissipation efficiency caused by low specific heat capacity and poor heat conductivity of air in air cooling is solved.

The utility model discloses a film capacitor for flexible direct current power transmission, which belongs to the technical field of capacitors and comprises a shell, a plurality of capacitor cores and extraction electrodes, the shell is made of metal materials, the plurality of capacitor cores are grouped to form a plurality of capacitor core independent groups, and the extraction electrodes are arranged in the shell. Each capacitor core independent group is connected with a tinned copper plate, the lead-out electrode is provided with a laminated busbar and is connected with the tinned copper plate in a matched manner through the laminated busbar, and the plurality of capacitor core independent groups are packaged in the shell through a potting material. The thin-film capacitor can simultaneously meet the performance requirements of low self-inductance, low temperature rise, high energy density, light weight and long service life, thereby effectively improving the safety and reliability of the thin-film capacitor for flexible direct-current power transmission.

This application relates to the field of battery technology, and more particularly to a battery management component and battery pack. The battery management component includes a battery management module, which comprises: a BDU component, the BDU component including a housing and a relay module, the relay module being located within the housing; and a BMS slave board assembly, located above the BDU component along the height direction of the battery pack. The BMS slave board assembly includes a BMS cover and a slave circuit board, the BMS cover being disposed on the housing, and a cavity being formed between the BMS cover and the housing, with the slave circuit board located within the cavity. This application is beneficial for improving the energy density of the battery pack.

This invention provides a spatial acoustic wave manufacturing device, including a frame, an acoustic wave generating module, and a control module. The frame is equipped with a first X-axis guide rail, a second X-axis guide rail, a first Y-axis guide rail, a second Y-axis guide rail, a rotary platform, a Z-axis stepping electric cylinder, a robotic arm, and an ultrasonic actuating head. The control module and the above structures form a multi-degree-of-freedom motion system. This device enables the liquid tank carrying the workpiece and the ultrasonic actuating head to perform precise, multi-axis linkage relative motion in space, allowing the acoustic wave focus to be accurately positioned and continuously moved in three-dimensional space. This enables non-contact processing of workpieces with complex curved surfaces such as overhangs, internal cavities, spiral flow channels, and honeycomb grids, and allows printing without any physical support materials.

This invention belongs to the field of battery materials technology, and discloses a single-crystal lithium nickel manganese oxide material, its preparation method, and a lithium-ion battery. The single-crystal lithium nickel manganese oxide material contains Li... x Ni 2‑x The percentage content of O2 is C≤1.6%, C=(I LixNi2‑xO2 / (I LixNi2‑xO2 +I LiNi0.5Mn1.5O4 ))×100%, I LixNi2‑xO2 For Li in the XRD refinement results x Ni 2‑x The diffraction peak intensity corresponding to O2, I LixNi2‑xO2 +I LiNi0.5Mn1.5O4 To add LiNi to the XRD refinement results 0.5 Mn 1.5 O4 and Li x Ni 2‑x The diffraction peak intensity of the O2 two-phase model indicates a grain size of 5–11 μm. The aforementioned single-crystal lithium nickel manganese oxide material was prepared via a lithium-deficient high-temperature sintering and lithium-replenished low-temperature sintering process. Li x Ni 2‑x Large-particle monocrystalline lithium nickel manganese oxide materials with low O2 content avoid electrolyte decomposition under high voltage, thus preventing the generation of HF and Li. x Ni 2‑x The O2 reaction can effectively improve the cycle stability of the battery. Simultaneously, the high compaction density of monocrystalline lithium nickel manganese oxide material can enhance the battery's energy density, thermal stability, mechanical properties, and durability. The method for preparing monocrystalline lithium nickel manganese oxide material in this invention is relatively simple, reliable, and effective, and can utilize existing production lines.

The utility model relates to the field of battery packs, in particular to a battery pack and electric equipment. The battery pack comprises a box body, a heat dissipation structure and a battery cell, the battery cell is arranged in the box body; the battery cell is of a prism structure, and chamfers are arranged at the edges; a plurality of battery cells are arranged in an array, the chamfers of a plurality of adjacent battery cells enclose to form a mounting cavity, and / or the chamfers of two adjacent battery cells and the box body enclose to form a mounting cavity, and / or the chamfers of the battery cells and the corners of the box body enclose to form a mounting cavity; the heat dissipation structure comprises a first heat dissipation pipe and a heat dissipation fin assembly. The first heat dissipation pipe penetrates through and is fixedly installed in the installation cavity, and the heat dissipation fin assembly is arranged between the first heat dissipation pipe and the hole wall of the installation cavity and arranged in the extending direction of the first heat dissipation pipe. Therefore, the overall occupied space of the heat dissipation structure and the battery cells can be reduced, the space in the box body can be saved, and the energy density in the battery pack is improved while the heat dissipation capability of the battery pack is ensured.

This invention discloses a low-temperature resistant, high-power aqueous organic-bromine battery, belonging to the field of electrochemical energy storage technology. The invention uses a low-freezing-point bromine-based salt solution with added bromine solid complexing agent as the electrolyte, and a pseudocapacitive organic material as the negative electrode, which possesses ionic universality and can bind metal ions in the solution during the reaction. The positive electrode uses a carbon material as a substrate, where a bromine redox reaction occurs. Simultaneously, the complexing agent can complex bromine in solid form onto the carbon surface, ensuring good stability at both room temperature and low temperatures. The aqueous organic-bromine battery of this invention exhibits high energy density and ultra-high power density at room temperature, maintains high energy density even at low temperatures, and is inexpensive, showing promising application prospects.

This invention provides a cylindrical battery and an electrical device. The cylindrical battery includes a core, which includes at least one negative electrode and at least one positive electrode wound together, and a separator is provided between two adjacent positive and negative electrode sheets; a tab is provided on one side of the unfolded negative electrode sheet along its length, and the negative electrode sheet has a first tabless region, which is the area located between the starting end of the winding and the edge of the tab near the starting end of the winding; the cylindrical battery satisfies formula (I): 0.033≤a / b≤0.341 (I), where a represents the ratio of the length of the first tabless region to the unfolded length of the negative electrode sheet; b represents the ratio of the discharge capacity of the cylindrical battery at 25°C and 4C rate to the discharge capacity at 0.33C rate.

The application provides a sodium ion battery electrolyte and a sodium ion battery, and relates to the technical field of sodium ion batteries.A sodium ion battery electrolyte comprises a sodium salt, an organic solvent and an additive.The additive is selected from one or more of a thioimide functional additive and a film-forming additive.The sodium ion battery electrolyte provided by the application can inhibit the dissolution of SEI films and CEI films, improve the cycle stability of the sodium ion battery under high pressure, and thus improve the energy density and service life of the sodium ion battery.

The utility model relates to a battery field especially relates to a battery cover plate with PTFE coating, including cover plate body, the one side of cover plate body is coated with PTFE coating, the other side of cover plate body both ends symmetry is provided with positive pole assembly, negative pole assembly, positive pole assembly, negative pole assembly all are composed of sealing washer, pole, welding ring, upper plastic, the middle part of cover plate body is equipped with explosion -proof valve hole, and cover plate body is located at the explosion -proof valve hole place through the buckle place is provided with safety valve explosion -proof membrane, explosion -proof valve protection plastic piece, and the other side of cover plate body is located at the explosion -proof valve hole place and is provided with PET face paste, in the utility model, cover plate body cancels the mode of using insulating film, the place needing insulation of original changes to have PTFE coating, through PTFE coating, the thickness of cover plate insulating layer is reduced greatly, provides more accommodating pole piece's space for battery height direction, improves battery energy density.

This invention discloses a sucrose-polypropylene composite hard carbon and its preparation method, belonging to the technical field of sodium-ion battery anode materials. The preparation method of the composite hard carbon includes using sucrose as a raw material, first preparing a precursor, mixing it with polypropylene, ball milling it, pre-oxidizing it at low temperature, and then carbonizing it at high temperature. The closed-pore volume of the material of this invention increases, the interlayer spacing expands, and the packing density of the material increases, thereby improving the energy density of the material. The reversible specific capacity of the hard carbon material of this invention can be increased from the initial 271 mAh g. ‑1 Increased to 387mAh.g ‑1 The capacity ratio in the low-voltage plateau region can be increased from 54% to 64%. Under optimal process conditions (M-SC:PP = 2:1, pre-oxidation at 330℃), the sucrose-polypropylene composite hard carbon prepared at 100 mA g... ‑1 It still retains 240mAh after 300 cycles. ‑1 Its capacity is far higher than that of directly calcined sucrose-based hard carbon materials (100 mAh / g). ‑1 The material exhibits good cycle stability and rate performance.

The utility model discloses an L-shaped tab and a soft package battery structure, which belong to the technical field of batteries, the L-shaped tab comprises a battery cell main body and an L-shaped tab, the battery cell main body comprises a side edge sealing area, a top edge sealing area and a naked battery cell, the side edge sealing area and the top edge sealing area are sealed to form a closed space, the naked battery cell is arranged in the closed space, and the L-shaped tab is arranged in the closed space. The side edge sealing area comprises a side seal inner unsealed area and a side seal sealing area, the top edge sealing area comprises a top seal inner unsealed area, a top seal sealing area and a top seal outer unsealed area, and a heat seal sealing area is formed at the joint of the side seal inner unsealed area and the top seal inner unsealed area through heat seal; a notch is cut at the intersection of the top sealing area and the side sealing area, PP glue covers the long tab handle, the PP glue comprises exposed PP glue, the exposed PP glue is arranged outside the outer unsealed area, and the long tab handle, the exposed PP glue and the top edge sealing area are bent to form a top edge L-shaped or top edge side U-shaped edge folding structure. Through the battery structure, the battery length is reduced, and the space utilization rate of the battery structure is improved.

The utility model discloses a kind of plasma cleaning plate, including bottom plate, bottom plate is provided with cathode, the surface of bottom plate is opened with at least one cathode groove, cathode groove is U shape, by the cathode groove design is U-shaped curved surface, the contact area of cathode and anode is significantly increased 30%-50%, current density distribution is optimized, make ionization area more concentrated and uniform, greatly improve the energy density of plasma arc and atmosphere dissociation degree, and, plasma can be maintained in lower temperature state in generation and effect process, unnecessary heat loss is reduced, to realize the effect of energy saving, at least one row of array distribution's plasma cleaning hole is equipped in cathode groove, and staggered distribution design is adopted, so that plasma beam is ejected at different angles and positions, form interlaced covering jet field, not only significantly improve cleaning efficiency, make cleaning process more efficient, can also ensure that cleaning has no dead angle, more comprehensive.

This application relates to secondary batteries, battery modules, battery packs, and electrical devices. The secondary battery includes a positive electrode and a negative electrode. The positive electrode includes a positive current collector, a first positive active material layer distributed on one side of the positive current collector, and a second positive active material layer distributed on the other side of the positive current collector. The negative electrode includes a negative current collector, a first negative active material layer distributed on one side of the negative current collector and opposite to the second positive active material layer, and a second negative active material layer distributed on the other side of the negative current collector. The resistance of the first positive active material layer is R1, the resistance of the second positive active material layer is R2, the resistance of the first negative active material layer is R3, and the resistance of the second negative active material layer is R4, and they satisfy the following relationships: (1) R2 > R1, (2) R3 ≥ R4, (3) 0 < (R1 + R4) / (R2 + R3) ≤ 1, and (4) R1 / R2 = A × R4 / R3, where A is 0.8 - 1.2.

This invention discloses a low-corrosion chloride molten salt heat transfer and storage medium, method, and application, belonging to the field of molten salt thermal storage technology. The high-heat-capacity, low-corrosion carbonate molten salt heat transfer and storage medium of this invention is composed of 18%~22% potassium chloride, 6%~10% sodium chloride, 1%~3% aluminum powder, 1%~3% magnesium powder, 1%~3% zinc powder, with the remainder being zinc chloride. Its key feature is the introduction of metal powder into the molten salt, which not only achieves excellent thermal storage performance at 600℃~800℃, but also reduces corrosion by utilizing the potential regulation ability of dissolved metal ions and the formation of highly active [Al] from gaseous chloride products through physical and chemical adsorption. This low-corrosion chloride molten salt heat transfer and storage medium achieves excellent thermal storage performance and low corrosivity, and can be applied in solar thermal power generation and molten salt energy storage.