摘要:
An alkali metal, solid cathode, nonaqueous electrochemical cell capable of delivering high current pulses, rapidly recovering its open circuit voltage and having high current capacity, is described. The stated benefits are realized by the addition of at least one nitrite additive to an electrolyte comprising an alkali metal salt dissolved in a mixture of a low viscosity solvent and a high permittivity solvent. A preferred solvent mixture includes propylene carbonate, dimethoxyethane and an alkyl nitrite additive.
摘要:
The present invention is related to an electrochemical cell comprising an anode of a Group IA metal and a cathode of a mixed phase metal oxide prepared from a combination of starting materials comprising vanadium oxide and a mixture of at least one of a decomposable silver-containing constituent and a decomposable copper-containing constituent. The starting materials are mixed together to form a homogeneous admixture that is not further mixed once decomposition heating begins to form the product active material. The present cathode material is particularly useful for implantable medical applications.
摘要:
An alkali metal, solid cathode, nonaqueous electrochemical cell capable of delivering high current pulses, rapidly recovering its open circuit voltage and having high current capacity, is described. The stated benefits are realized by the addition of at least one phosphate additive to an electrolyte comprising an alkali metal salt dissolved in a mixture of a low viscosity solvent and a high permittivity solvent. A preferred solvent mixture includes propylene carbonate, dimethoxyethane and an alkyl phosphate additive.
摘要:
A nonaqueous electrolyte comprising a ternary solvent system preferably including a linear ether mixed with a high permittivity solvent and a low viscosity solvent, is described. This electrolyte is useful for activating an alkali metal/solid cathode electrochemical cell of the kind that typically powers implantable medical devices. The new electrolyte provides improved cell capacity under high current pulse discharge applications while decreasing cell swelling by about 20% in comparison to conventional nonaqueous organic electrolytes consisting of propylene carbonate and dimethoxyethane as the solvents.
摘要:
A spirally-wound electrochemical cell having a resilient member such as a resilient pad or a wave spring (52) disposed between the spirally-wound electrode and separator assembly (30) and at least one of the end walls (18) for resiliently dissipating mechanical forces acting to otherwise cause axial movements of the spirally-wound assembly.
摘要:
The invention generally relates to the conversion of chemical energy to electrical energy, and more particularly to a combination battery having at least two separate and distinct electrochemical cells housed inside the same battery casing. The combination battery preferably comprises both a constant discharge rate cell and a pulse discharge rate cell. The constant discharge rate cell (the medium rate cell) preferably includes an electrode assembly comprising a single cathode structure flanked on either side by an alkali anode. The pulse discharge rate cell (high rate cell) preferably includes an electrode assembly comprising a single cathode and anode that are wound together in a "jellyroll" fashion. Suitable separators are provided to prevent short circuiting and both cell assemblies are housed within the same hermetically sealed, prismatic casing.
摘要:
An electromagnetic pump comprising a housing having a fluid receiving chamber (14) in communication with an inlet (18), a fluid pumping chamber (16) in fluid communication with an outlet (20), a check valve operatively associated with the fluid receiving chamber, and a barrier in the form of a thin diaphragm hermetically isolating the electromagnet from the fluid chambers. An armature of the pump includes both a pole portion located for magnetic attraction by the electromagnet and a piston portion to force fluid out of the chambers. The armature pole portion has a fluid-contacting section of material which is compatible with and corrosion resistant to the fluid. A controlled bypass (274) is provided for bubbles in the fluid. An outlet orifice (290) and accumulator (436) are provided in the path of fluid flow from the pump outlet.
摘要:
A solid cathode liquid organic electrolyte alkali metal high rate cell wherein a combination of an elongated alkali metal anode and elongated solid cathode with separator therebetween is wound to form an anode-cathode subassembly having a jellyroll type configuration and wherein the combination is shaped so that the resulting sub-assembly has a substantially rectangular cross-section, the shaping of the combination being done either simultaneously with or subsequent to the winding thereof. The anode-cathode sub-assembly is placed in a conductive cell casing of prismatic shape having opposed flat faces, a lead of either the anode or cathode is attached to the cell casing depending upon whether case positive or case negative electrical configuration is desired and a lead of the other of the anode or cathode is connected to an electrical connector means extending through the casing in an insulated manner. Liquid electrolyte is introduced to the anode-cathode sub-assembly in the casing whereupon the casing then is sealed closed. The foregoing provides a new and improved prismatic high rate battery which significantly reduces the time required to manufacture the cell stack assembly while maintaining the requisite performance, safety and reliability standards in operation.
摘要:
An autoclavable electrochemical cell which may be used in an implantable medical device. The anode active material is lithium or other material from Groups IA and IIA of the Periodic Table and having a melting point greater than about 150 degrees C. The cathode active material is silver vanadium oxide or other metal oxide or a metal oxide bronze or carbon monofluoride. The solvent for the electrolyte has a boiling point greater than about 100 degrees C. and a dielectric constant greater than about 5 so that the cell may be dimensionally and chemically stable during repeated exposures of about one hour each to the autoclaving temperatures.