202results about "Secondary cells" patented technology

A prosthetic stented heart valve which includes a compressible and expandable stent structure having first and second opposite ends, an expanded outer periphery, and a compressed outer periphery that is at least slightly smaller than the expanded outer periphery when subjected to an external radial force. The valve further includes a valve segment comprising a dual-layer sheet formed into a generally tubular shape having at least one longitudinally extending seam, and a plurality of leaflets formed by attachment of an outer layer of the dual-layer sheet to an inner layer of the dual-layer sheet in a leaflet defining pattern. The valve segment is at least partially positioned within the stent structure. The valve may further include at least one opening in the outer layer of the dual-layer sheet that is spaced from both the first and second ends of the stent structure.

The invention belongs to the technical field of transition metal sulfides, namely carbon materials, and particularly discloses a nickel cobalt sulfide/graphene/carbon nanotube composite material and a preparation method and an application thereof. The method comprises the following preparation processes: mixing graphene oxide with a carbon nanotube, and preparing a graphene oxide/carbon nanotube hybrid material through ultrasound; and carrying out in-situ growth of a nickel cobalt sulfide nanosheet on the graphene oxide/carbon nanotube hybrid material through a one-step hydrothermal process. The graphene oxide/carbon nanotube hybrid material prepared by the method has the advantages of a three-dimension porous space structure, excellent conductivity, large specific surface area, stable chemical property and the like; the final nickel cobalt sulfide/graphene/carbon nanotube composite material is controllable in morphology; the nickel cobalt sulfide nanosheet evenly grows on the graphene oxide/carbon nanotube hybrid material; and a unique base structure and high specific surface area of the graphene oxide/carbon nanotube hybrid material are fully utilized. The material disclosed by the invention can be used as an ideal high-performance electric catalytic material, and an electrode material for new energy devices of a lithium-ion battery, a super capacitor and the like.

The invention discloses a heat dissipation and thermal runway dispersion protection structure in a cell system. The structure comprises a module shell and at least one composite heat-conducting plate, wherein a plurality of unit cells are arranged in the module shell; and the composite heat-conducting plate is positioned in the module shell, is contacted with the module shell, is arranged between at least two unit cells to serve as a transfer medium of heat between a cell and the shell and control the heat transfer between the cells, and has a multilayer anisotropic heat-conducting structure which consists of at least one heat-conducting layer and at least one heat-insulating layer.

A case battery for a personal digital assistant is provided. The case battery includes a holding portion and a charging portion. The holding portion holds the personal digital assistant detachably. The charging portion is disposed in the holding portion and configured to be electrically connected to the power input. The charging portion extends the usage time of the personal digital assistant. The charging portion includes an electrical power acceptor configured to accept electrical power from outside. The charging portion may further include a secondary battery, and the electrical power acceptor is configured to charge the secondary battery using an external electrical power source. The charging portion may include a primary battery and a receptacle configured to accept the primary battery.

The invention discloses a lithium-supplementing additive as well as a preparation method and application thereof. The lithium-supplementing additive is of a core-shell structure, a core material is aconductive carbon material, a shell material is lithium oxide, lithium oxide is deposited on the surface of the conductive carbon material, and nano-scale lithium oxide particles form a nano-layer shell. According to the lithium-supplementing additive, lithium oxide is composited with the conductive carbon material and is utilized for supplementing lithium, and the conductive carbon material is utilized for conducting electrons, so that the utilization rate of lithium oxide is increased, and lithium can be well supplemented to an positive electrode or a negative electrode. Furthermore, after lithium is removed from the lithium-supplementing additive, the conductive carbon material can be used as an electrode conducting material, and no impurity is introduced. The lithium-supplementing additive is safe, environmentally friendly and non-toxic, and a foundation is laid for the preparation of high-capacity lithium ion batteries.

The invention discloses a power battery thermal management system with functions of efficient heat dissipation and efficient heating. The power battery thermal management system comprises a power battery case and a thermal management system, wherein a plurality of battery monomers are adjacently aligned to form a battery pack placed inside a battery case housing, a composite phase change material plate is sandwiched between the gap of the adjacent batteries and the surface of the outermost side battery in the battery pack width direction, the composite phase change material plates and thermal pipes are combined to form composite phase change material thermal pipe coupling components, the composite phase change material thermal pipe coupling components are additionally arranged on both sides of the battery pack, the thermal pipes extends from the through holes on the battery module housing, the extending ends are connected to heating devices and heat dissipation fans, and a programmable automatic temperature regulator treats the signal from a temperature sensor by programming so as to determine whether the fans and the heating devices are started. The power battery thermal management system of the present invention has advantages of simple and firm whole structure, high efficiency, stable operating, and the like. In addition, the battery pack can be subjected to direct, unified and uniform cooling and heating, such that the battery can work at the appropriate temperature range, and the electric vehicle battery thermal management system is improved.

The invention relates to the technical field of lithium ion batteries, in particular to core-shell structured carbon for a cathode material of a lithium ion battery and a preparation method thereof, and the lithium ion battery taking the core-shell structured carbon as the cathode material and a preparation method thereof. The core-shell structured carbon comprises a hard carbon material serving as a 'core' and soft carbon 'shell' which is coated on the surface of the 'core'. On the one hand, the hard carbon material serving as the 'core' provides a large number of spaces for storing lithium and channels for lithium ions to move, and the energy density and power density of the material are improved, and on the other hand, the soft carbon 'shell' with a graphite structure ensures that the material has high coulombic efficiency and cycle performance, so that the lithium ion battery made of the core-shell structured carbon serving as the cathode material has high capacity, high power characteristic, high cycle performance and high first charge and discharge coulombic efficiency, the preparation method is simple, and the cost is low.

The invention provides a hydrothermal preparation method of a graphene-coated sulfur/porous carbon composite material and relates to a preparation method of the graphene-coated sulfur/porous carbon composite material for a positive electrode material of a lithium-sulfur storage battery. The hydrothermal preparation method is used for solving the technical problem that the electrochemical property of the positive electrode material of an existing lithium-sulfur battery, namely a graphene-coated sulfur-containing composite material, is low. The hydrothermal preparation method comprises the steps of mixing and scattering the sulfur/porous carbon composite material with graphene slurry or oxidized graphene slurry, carrying out hydrothermal synthesis to prepare a hydrogel column, and drying to obtain the graphene-coated sulfur/porous carbon composite material. According to the graphene-coated sulfur/porous carbon composite material prepared by utilizing the hydrothermal preparation method, the outer surfaces of the graphene sheet layers are coated with sulfur/porous carbon composite material particles, a graphene conduction network is generated among the particles, and the obtained graphene-coated sulfur/porous carbon composite material is in a hierarchical core-shell structure; the positive electrode material has the high specific capacity, the long cycle life and the good rate capability; the composite positive electrode material can be used as a positive electrode material in a lithium secondary battery.

The invention discloses a method for preparing a nickel-cobalt-manganese ternary material precursor. By virtue of the method, waste small-particle-size nickel-cobalt-manganese ternary material precursors in a product are separated out and recycled into a reaction kettle, so that the ternary material precursors with the particle size of 7-15 micro meters account for over 95% in the product.

A process for producing a spherical carbon material, comprising: subjecting a spherical vinyl resin to an oxidation treatment in an oxidizing gas atmosphere to obtain a spherical carbon precursor, and carbonizing the spherical carbon precursor at 1000-2000° C. in a non-oxidizing gas atmosphere. The thus-obtained spherical carbon material exhibits excellent performances, including high output performance and durability, when used, e.g., as a negative electrode material for non-aqueous electrolyte secondary batteries.

The invention discloses an alumina coating method of a lithium ion battery positive electrode material. The method comprises the following steps: adding ammonia water to a positive electrode material suspended aluminum nitrate solution in a dropwise manner to form a precipitate coated by Al(OH)3, and heating the precipitate in an air atmosphere muffle furnace to form an alumina coated positive electrode material. The coating method can improve the charge and discharge capacity of the lithium ion battery and prolong the cycle life.

The invention relates to a lithium silicate-coated Ni-Co lithium aluminate positive electrode material and a preparation method thereof. The mass percent of lithium silicate in the material accounts for 1-10wt%, a coating layer with a thickness being 2-20 nanometers is formed from the silicon silicate and is coated on Ni-Co lithium aluminate, and the positive electrode material is a spherical particle with a grain size being 5-15 micrometers. The method comprises the following steps of (1) adding a silicon source into an organic solvent, performing uniform stirring, adding water, adding Co-Alnickel hydroxide, performing heating and stirring reaction, and performing drying to obtain silicon dioxide-coated Co-Al nickel hydroxide precursor powder; and (2) grinding and uniformly mixing the silicon dioxide-coated Co-Al nickel hydroxide precursor powder and a lithium salt, placing the mixture in a tubular furnace, and performing two-segment calcination under an oxidization atmosphere, thereby obtaining the lithium silicate-coated Ni-Co lithium aluminate positive electrode material. The positive electrode has relatively good cycle stability and large-rate discharging performance; and bythe method, the problem of lithium resided on a surface during conventional coating can be effectively reduced, and the method is low in cost and simple in process and is suitable for industrial production.

The present invention relates to a method for winding coil core of lithium ion battery which comprises of steps of: unreeling the first membrane and the second membrane by unwinders of their own respectively at the same time, sending two source of two membranes connected between upper briquetting and lower briquetting of unwinder to be clamped, puncturing coiling needle, and inserting two electrode slices, driving upper briquetting and lower briquetting closed to clamp the next first membrane and the second membrane making the clamped parts of two membranes are connected, starting membrane cutter to cut the two membranes, pressing and binding the coiled coiling core rudiment, the winding coil core of lithium ion battery is obtained. Comparing to the present technique, the present invention can reduce cost of winding coil core of lithium ion battery, and at the same time, is suitable for semi-automatic and full-automatic unwinder and improves the production efficiency.

The invention discloses an automobile battery fixing device. The automobile battery fixing device comprises an outer frame, a shock absorbing frame is fixedly connected to a fixed base through an anti-pressure shock absorbing device, an automobile battery is arranged at the top of the fixed base, a battery fixing clamp is fixedly connected to the inner wall of the outer frame, a spiral heat absorbing oil pipe is fixedly connected to the surface of a heat absorbing fixed plate, the right end of the outer frame extends to form a fixing plate, the top end of the fixing plate is fixedly connected to a cooling oil pipe box, a spiral cooling oil pipe is arranged in the cooling oil pipe box, an oil pipe is communicated with the spiral cooling oil pipe, the left side of a hygroscopic evaporator is fixedly connected to a hygroscopic cooler and the left end of the hygroscopic cooler is fixedly connected to a refrigerator. The automobile battery fixing device relates to the technical field of automobiles, solves the problem that the existing automobile battery has poor cooling effects and poor clamping stability, improves automobile motor heat dissipation effects and automobile battery resistance to shock and prolongs a service life of the automobile battery.

The invention discloses a lithium-ion battery heat insulation device and a control method thereof. The heat insulation device comprises an insulation box for containing a lithium-ion battery, and a temperature control circuit of which the power is supplied by the lithium-ion battery and which is used for controlling the ambient temperature around the lithium-ion battery; and the temperature control circuit is arranged in the insulation box. The temperature control circuit comprises a temperature detection module, an automatic temperature control switch module and a temperature controlling device; the temperature detection module is connected with the automatic temperature control switch module; and the automatic temperature control switch module is serially connected with the temperature control device. The invention solves the problem that an existing lithium-ion battery is seriously restricted by the ambient temperature when being used, so that an ordinary lithium-ion battery can be used normally not only at room temperature but also in cold environment and at high temperature, and the invention has the advantages of simple structure, easiness in manufacturing, convenience in use and good adaptability.

The invention discloses a coating modification method for improving performance of a rich-lithium manganese-base positive electrode material. The rich-lithium manganese-base positive electrode material is arranged in the material, wherein the rich-lithium manganese-base material is Li[LixMn1-x-yMy]O2; praseodymium phosphate is arranged on a surface layer of the material; intermigration of a transition metal ion, a phosphate radical and a praseodymium ion exists in a coating process; and a new phase capable of conducting an ion and an electron is generated on an interface. The method comprises the following specific steps of ultrasonically dispersing the rich-lithium manganese-base material in secondary water or an organic solution to form a disperse and uniform suspension; dissolving praseodymate in the suspension; adding phosphoric acid or phosphate to allow a phosphate radical ion and the praseodymium ion to perform a precipitation reaction on the surface of the rich-lithium manganese-base material; generating an initial coating layer; obtaining slurry comprising the initial coating layer; and finally drying the obtained slurry and then calcinating the slurry to obtain the rich-lithium manganese-base anode composite powder material comprising a praseodymium phosphate coating layer. The rich-lithium manganese-base composite material comprising the praseodymium phosphate coating layer prepared by the method is low in cost, high in capacity, high in first efficiency, low in voltage drop, good in stability and good in rate performance.

The invention relates to an electrolyte for a ternary cathode material lithium ion battery. The electrolyte comprises a lithium salt, organic solvent and an additive, wherein the lithium salt is an imidodisulfuryl fluoride lithium salt of which the concentration is greater than 1 mol/L; the organic solvent comprises cyanogen carboxylate and other non-water organic solvent; the addition mass of the cyanogen carboxylate is 5-35% of the total mass of the organic solvent; the cyanogen carboxylate is a combination of one or more selected from the following structural formulae in the specification; and at least one of R1 and R2 is a cyanogen radical or a cyanogen radical containing group. By using the electrolyte provided by the invention, the cycle performance of the ternary cathode material lithium ion battery at normal temperature can be stabilized, the aging and swelling phenomena of the ternary cathode material lithium ion battery under high-temperature conditions can be inhibited, and the internal resistance of the ternary cathode material lithium ion battery is reduced.

The invention relates to a battery technology, in particular to a solid sodium battery electrolyte and a preparation and an application thereof. The electrolyte is a carbonic ester polymer, a sodium salt and a porous support material, wherein the thickness of the electrolyte is 20-600 microns; the ionic conductivity is 1*10<-5>S/cm to 1*10<-3>S/cm; and an electrochemical window is greater than 3.6V. The preparation comprises the following steps: dissolving the carbonic ester polymer and the sodium salt into a solvent at a certain ratio; preparing a film on the porous support material; and carrying out vacuum drying to obtain the solid sodium battery electrolyte material. The assembled solid sodium battery is good in rate capability and has excellent long-cycle stability; and no electrolyte is added, so that the safety is high. The main body material is the carbonic ester polymer, so that the price is low; and the cost is low. The solid sodium battery electrolyte material is simple to prepare.

Provided is an auto-thermal evaporative liquid-phase synthesis method for cathode material for battery, comprising the following steps: (1) Adding a synthetic raw material of cathode material into a solvent to obtain a mixture A, the synthetic raw material of the cathode material containing lithium source, adding an accelerant into the mixture A, which makes the mixture A achieve a strong auto-thermal reaction to release heat to evaporate the solvent, and obtaining a solid precursor of the cathode material; (2) Drying the precursor, sintering in an atmosphere furnace and obtaining the cathode material. The method is simple in process, low in energy consumption, requirements for equipment and cost, and is applicable to industrial mass production and application. The cathode material obtained through the method is stability in batch, easy to process, low in internal resistance and high in capacity and has an excellent charging and discharging performance.

The invention provides a lithium supplementing diaphragm of a lithium ion battery. The lithium supplementing diaphragm comprises a plurality of diaphragm layers which are overlapped with one another;a metal lithium layer is arranged on the diaphragm layers; a protective layer is arranged on the metal lithium layer; and the diaphragm layers are polymer films. The lithium supplementing diaphragm ofthe lithium ion battery can be directly used for the pre-lithiation (lithium supplementing) of the negative electrode of the lithium ion battery, so that the first coulombic efficiency and cycle performance of the lithium ion battery are improved; the metal lithium layer is prevented from being etched by electrolyte and environment atmosphere; the metal lithium layer is prevented from irreversibly and chemically reacting with a negative electrode active layer; and the pre-lithiation or lithium supplementing efficiency of the electrode is improved.

A tearable low adhesive sheet (29) is attached to a battery pack (19). This low adhesive sheet (29) is bonded with a double-sided adhesive tape (31) to a bottom face (17a) of a battery accommodating part (17) shaped into a recess and provided to a front cabinet (7) included in a casing (3), so that the battery pack (19) is secured to the battery accommodating part (17).

A device for cooling a heat source of a motor vehicle is provided that includes a cooling body which has a plurality of feed flow channels and a plurality of return flow channels. At least a multiplicity of the feed flow channels and return flow channels are arranged adjacent to one another in an alternating fashion in the cooling body.

The invention relates to an electric vehicle, a battery box body thereof, and a battery box. A cooling structure is arranged on a bottom plate assembly of the battery box and comprises two or more layers of hollow channels which are formed at intervals in vertical direction, the upper hollow channel forms a cooling channel used for allowing cooling liquid to circulate, and the lower hollow channelis filled with a thermal insulation material; and in the operating process of the battery box, the cooling liquid in the cooling channel can cool a battery module in the battery box. Meanwhile, the lower hollow channel is filled with the thermal insulation material, thus a thermal insulation layer is formed, heat in the external environment is prevented from being transmitted into the battery box, through the thermal insulation material, the heat in the external environment is prevented from influencing the cooling liquid, and the problem that properties of the battery box are influenced accordingly is solved; and after the bottom plate assembly is filled with the thermal insulation material, the weight of the bottom plate assembly can also be lowered obviously, hollow structures are arranged, and thus the structural strength of the bottom plate assembly can further be ensured.

The invention relates to a graphite negative electrode material of a low-temperature lithium ion battery and a preparation method thereof. The graphite negative electrode material of the low-temperature lithium ion battery comprises graphite and a fast ion conductor coated on the graphite surface; The oxidation-reduction potential of the fast ionic conductor is higher than that of graphite. The preparation method comprises the following steps of: wet ball milling the original graphite powder, drying the mixed liquid into powder by a spray dryer to obtain graphite powder with smaller particle size, intercalating the graphite powder, coating the surface of the graphite powder, and obtaining graphite negative electrode material for low-temperature lithium ion batteries. As in that anode material structure, particle size of the graphite can be controlled, diffusion distance of lithium ion is shorten, graphite interlayer spacing is increased after intercalation, that ion diffusion ability of the electrode material at low temperature can be obviously improved, the integral conductivity can be improved by intercalated metal or highly conductive substance between graphite layers, and a stable and uniform SEI film can be formed by coating a fast ionic conductor on the graphite surface, the lithium ion diffusion ability can be improved, and the interface property at low temperature can be improved. This material can also be used as an ideal cathode material for sodium ion batteries and high performance supercapacitor materials.