224 results about "Lithium polymer cell" patented technology

Batteries including a lithium electrode and a sulfur counter electrode that demonstrate improved cycling efficiencies are described. In one embodiment, an electrochemical cell having a lithium electrode and a sulfur electrode including at least one of elemental sulfur, lithium sulfide, and a lithium polysulfide is provided. The lithium electrode includes a surface coating that is effective to increase the cycling efficiency of said electrochemical cell. In a more particular embodiment, the lithium electrode is in an electrolyte solution, and, more particularly, an electrolyte solution including either elemental sulfur, a sulfide, or a polysulfide. In another embodiment, the coating is formed after the lithium electrode is contacted with the electrolyte. In a more particular embodiment, the coating is formed by a reaction between the lithium metal of the lithium electrode and a chemical species present in the electrolyte.

Batteries including a lithium electrode and a sulfur counter electrode that demonstrate improved cycling efficiencies are described. In one embodiment, an electrochemical cell having a lithium electrode and a sulfur electrode including at least one of elemental sulfur, lithium sulfide, and a lithium polysulfide is provided. The lithium electrode includes a surface coating that is effective to increase the cycling efficiency of said electrochemical cell. In a more particular embodiment, the lithium electrode is in an electrolyte solution, and, more particularly, an electrolyte solution including either elemental sulfur, a sulfide, or a polysulfide. In another embodiment, the coating is formed after the lithium electrode is contacted with the electrolyte. In a more particular embodiment, the coating is formed by a reaction between the lithium metal of the lithium electrode and a chemical species present in the electrolyte.

A lithium polymer (LiPo) battery pack having LiPo battery cells is provided which includes battery protection circuitry, charging circuitry, cell balancing circuitry, and control and communication circuitry. The batteries can be charged while in use by an internal charger. Battery charging and discharging are accomplished in a controlled and protected manner to avoid overcharging and overdischarging conditions. The novel battery pack has built-in safeguards against dangerous LiPo battery conditions and is implemented in a small, portable unit which contains the battery cells, control and protection circuitry, internal charger and display gauge. The battery pack is useful for powering an intravenous fluid warmer or other medical or electrical devices and equipment.

The LixMn2O4 powder for cathode active material of a lithium secondary battery of the present invention is prepared by a method of comprising the steps of mixing an acetate aqueous solution using Li acetate and Mn acetate as metal precursors, and a chelating agent aqueous solution using PVB, GA, PAA or GC as a chelating agent; heating the mixed solution at 70 DIFFERENCE 90 DEG C. to form a sol; further heating the sol at 70 DIFFERENCE 90 DEG C. to form a gel precursor; calcining the produced gel precursor at 200 DIFFERENCE 900 DEG C. for 5 DIFFERENCE 30 hours under atmosphere. The cathode active material, LixMn2O4 powder for a lithium secondary battery in accordance with the present invention has a uniform particle size distribution, a high crystallinity and a pure spinel-phase, and a particle size, a specific surface area, a lattice of a cubic structure and the like can be controlled upon the preparing conditions. The present invention also provides a method of preparing LiNi1-xCoxO2 powder, which comprises the steps of providing a gel precursor using PAA as a chelating agent and hydroxide, nitrate or acetate of Li, Co and Ni as metal precursors; heating the gel precursor at 200 DIFFERENCE 900 DEG C. for 5 DIFFERENCE 30 hours to form a powder. The LixMn2O4 and LiNi1-xCoxO2 powder of the present invention can be used for a cathode active material of a lithium secondary battery such as a lithium ion battery or lithium polymer battery.

A battery sheath having a radiation layer on its surface and a lithium polymer battery using the sheath are provided. The radiation layer improves radiation performance and mechanical strength of the battery, and also improves the response of a PTC device. The battery sheath comprises a metal layer having first and second surfaces, a radiation layer on the first surface of the metal layer, and a cast polypropylene (CPP) layer on the second surface of the metal layer. The lithium polymer battery has a PTC device electrically connected to a protective circuit module. The PTC device directly contacts the radiation layer of the battery sheath, thereby improving the response of the PTC device.

The disclosed embodiments relate to a battery cell which includes a weakness for relieving pressure. This battery cell includes a jelly roll comprising layers which are wound together, including a cathode with an active coating, a separator and an anode with an active coating. The jelly roll also includes a first conductive tab coupled to the cathode and a second conductive tab coupled to the anode. The jelly roll is enclosed in a flexible pouch, wherein the first and second conductive tabs extend through seals in the pouch to provide terminals for the battery cell. This pouch includes a weakness which yields when internal pressure in the pouch exceeds a threshold to create a hole which releases the internal pressure.

Pouch-type lithium polymer batteries and a methods for manufacturing them are disclosed. One such battery comprises a wound electrode assembly comprising positive and negative electrode plates and a separator. Positive and negative electrode tabs are attached to the positive and negative electrode plates and extend from the electrode assembly. The electrode assembly is encased within a pouch which comprises a cavity and a cover. The positive and negative electrode tabs extend outside the pouch. A protective circuit module is electrically connected to the positive and negative electrode tabs and is molded with, or encased in a resin to form a protective circuit construction which is positioned against a front surface of the pouch. The pouch-type lithium polymer batteries of this invention can be used in external apparatuses such as laptop computers or PDAs. The protective circuit constructions of this invention are not short-circuited to external circuits of the external apparatuses.

In a hand warmer, a heat dissipating plate is thermally coupled to a heater that is supplied with current by a battery that is accommodated in a case. The battery is a box-shaped rechargeable battery of a box-shaped rechargeable lithium-ion battery or lithium-polymer battery that has flat surfaces opposed to each other. The heater is a heating element that is opposed to the flat surface of the battery. A shielding plate is arranged between the heating element and the flat surface of the battery. The heat dissipating plate that is thermally coupled to the heating element is secured to the case on the surface side of the case. In the hand warmer, the flat surface of the box-shaped rechargeable battery, the shielding plate and the heat dissipating plate are arranged in a stack structure. The heat dissipating plate is heated by the heating element.

A lithium polymer battery comprising an internal sheath, reinforcement members, and an external sheath and a method for manufacturing the same are provided. The lithium polymer battery comprises a pouch-type internal sheath with an electrode assembly positioned therein and a protective circuit module that is attached to the surface thereof to control the charging and discharging processes of the electrode assembly. The battery further comprises reinforcement members that couple with surfaces of the internal sheath and an external sheath for integrally enclosing the internal sheath and the reinforcement members. The external sheath may comprise a tube, a thermally contractible tube, or a melted resin.

The instant invention is a separator for a lithium polymer battery. The separator comprises a membrane and a coating. The membrane has a first surface, a second surface, and a plurality of micropores extending from the first surface to the second surface. The coating covers the membrane, but does not fill the plurality of micropores. The coating comprises a gel-forming polymer and a plasticizer in a weight ratio of 1:0.5 to 1:3.

The disclosed embodiments provide a lithium-polymer battery cell. The lithium-polymer battery cell includes an anode and a cathode containing lithium cobalt oxide particles doped with a doping agent. The lithium-polymer battery cell also includes a pouch enclosing the anode and the cathode, wherein the pouch is flexible. The cathode may allow a charge voltage of the lithium-polymer battery cell to be greater than 4.25V.

A battery charger controller is coupled to DC output terminals of an AC-DC (or DC-DC) adapter containing an AC-DC (or DC-DC) converter. A controlled current flow path between input and output terminals of the battery charger controller circuit is controlled to provide a substantially constant current to charge the battery to a nominal battery voltage. When a constant voltage output of the said adapter transitions to a value that limits available charging current to a value less than programmed constant charging current, current flow drive for the controlled current flow path is increased for a limited time interval. Thereafter, the controlled current flow path gradually reduces charging current as the battery voltage remains at its nominal battery voltage until the charge is complete or otherwise terminated.

Disclosed is a lithium polymer battery, which includes: an electrode assembly; an outer case receiving the electrode assembly, where an electrode tab of the electrode assembly is withdrawn out of the outer case; a protection circuit module provided at one side of the outer case, where an inner connection terminal of the protection circuit module is connected to the electrode tab of the electrode assembly and provided in parallel to the withdrawn direction of the electrode tab. The lithium polymer battery can improve reliability and safety of an electrical coupling state between a bare cell and a protection circuit module and assembling workability between the electrode tab and connection terminals by mechanically and electrically coupling them to each other without bending the electrode tab.

A high power bipolar battery, such as a high power lithium polymer battery is provided. The bipolar battery includes a plurality of multiple cell assemblies. The plurality of multiple cell assemblies is connected in series to form the high power bipolar battery. Each of the plurality of multiple cell assemblies includes a rigid core with a bipolar cell stack of multiple cells wound together around the rigid core to produce a large active cell area. The wound bipolar cell stack includes a positive battery connection and a negative battery connection. A container surrounds the bipolar cell stack. A positive terminal carried by the container is connected to the positive battery connection. A negative terminal carried by the container is spaced apart from the positive terminal and connected to the negative battery connection. A state-of-charge connector carried by the container is spaced apart from the positive and negative terminals. The state-of-charge connector include multiple conductors, each connected to a respective one of the multiple cells.

A solid polymer electrolyte for a battery is disclosed. The solid polymer electrolyte includes a first polymer capable of solvating a lithium salt, a lithium salt, and a second polymer which is at least partially miscible with the first polymer or rendered at least partially miscible with the first polymer; at least a portion of_the second polymer being crystalline or vitreous at the internal operating temperature of the battery.

The present invention relates to a safety apparatus and a protection method of a secondary battery, which can prevent explosion and fire of the secondary battery using a switch or a rupture switch attached on the outside of the secondary battery if a swelling degree of the secondary battery reaches a predetermined value when the secondary battery is swelled due to abnormal usage such as overcharge, short-circuit, reverse-connection and heat-exposure of large-capacity lithium polymer battery.

The present invention provides a battery case having a heat dissipation layer on its surface and a lithium polymer battery using the battery case. The heat dissipation layer can improve the heat dissipation and mechanical strength of the battery, and can also improve the responsiveness of the PTC device. The battery case includes a metal layer having first and second surfaces, a heat dissipation layer on the first surface of the metal layer, and a cast polypropylene (CPP) layer on the second surface of the metal layer. The lithium polymer battery has a PTC device electrically connected to the protection circuit module. The PTC device directly contacts the heat dissipation layer of the battery casing, thereby improving the responsiveness of the PTC device.

A polymer battery pack assembly comprising a mounting frame having a first cavity defining a first mounting location and a second cavity defining a second mounting location, the first and second cavities being separated from each other; a top case mounted on the second mounting location, the top case having a third cavity defining a third mounting location; a lithium polymer battery cell mounted within the first mounting location, the battery cell having a positive tap and a negative tap extending beyond the first cavity towards the second mounting location; and a protection circuit module mounted in the third mounting location, the protection circuit module being electrically connected to the positive tap and the negative tap when the top case is mounted to the mounting frame such that the protection circuit module fits into said second cavity.

The invention relates to a novel tubular-structure electric unmanned helicopter which has the prominent advantages of large load, high stability and long duration of voyage. When the novel tubular-structure electric unmanned helicopter is applied in different industries, the workflow is optimized, the working efficiency is improved, and the operation strength and the safety risk of labor personnel are reduced. The novel tubular-structure electric unmanned helicopter is implemented through the following technical scheme: the electric unmanned helicopter uses a novel material, is designed in a four-tube structure, is low in cost and high in safety and can load different equipment to work; due to the high transmission ratio and duty ratio as well as a lithium polymer battery, the running time of a novel power battery is prolonged, and a piece of much heavier operation equipment can be loaded; a tail tube detachable device, a tail vane shock mitigation system and a flybarless structure guarantee the stability and the safety of the unmanned helicopter; a cloud deck stabilizing technique guarantees the shooting angle, so that the picture flutter can be reduced to the greatest extent in the shooting from high altitude; and the industrial-grade application of the unmanned helicopter is achieved in the true sense.

A battery separator for a lithium battery is disclosed. The separator has a microporous membrane and a coating thereon. The coating is made from a mixture of a gel forming polymer, a first solvent, and a second solvent. The first solvent is more volatile than the second solvent. The second solvent acts as a pore former for the gel-forming polymer.

A battery sheath having enough mechanical strength to stably protect a battery from external impact is provided. The battery sheath also has reduced thickness, thereby increasing battery capacity. In addition, the battery sheath suppresses swelling, thereby preventing battery deformation. The battery sheath includes a base layer having a first surface and a second surface opposite the first surface. A first adhesive is applied to the first surface of the base layer to a predetermined thickness. A CPP layer is applied to the first adhesive to a predetermined thickness. A PET layer is laminated at high temperature on the second surface of the base layer to a predetermined thickness.

A photovoltaic energy autonomy system and method of a wireless sensor network node belong to the technical field of wireless communication. The system comprises an energy storage module, a power selection module, a voltage regulator module and a sensor node module, wherein the energy storage module is connected with the power selection module to transmit energy information; the power selection module is connected with the voltage regulator module to transmit power information; the voltage regulator module is connected with the sensor node module to transmit stable voltage information; the energy storage module is connected with the sensor node module to transmit monitoring information; the sensor node module is connected with the power selection module to transmit control information; and the energy storage module comprises a solar panel, a capacitor module, a charging management module and a lithium polymer battery. The invention can effectively reduce charge-discharge frequency, prolong the service life of the node, ensure simple integral circuit design and lower the energy loss.

A battery charger controller is coupled to DC output terminals of an AC-DC (or DC-DC) adapter containing an AC-DC (or DC-DC) converter. A controlled current flow path between input and output terminals of the battery charger controller circuit is controlled to provide a substantially constant current to charge the battery to a nominal battery voltage. When a constant voltage output of the said adapter transitions to a value that limits available charging current to a value less than programmed constant charging current, current flow drive for the controlled current flow path is increased for a limited time interval. Thereafter, the controlled current flow path gradually reduces charging current as the battery voltage remains at its nominal battery voltage until the charge is complete or otherwise terminated.

Method of making Li-intercalateable electrodes for a lithium-ion battery by applying a first film onto a first face of an electrically conductive grid, which film comprises a plurality of Li-intercalateable particles dispersed throughout a mixture of a polymeric binder and a plasticizer for the binder. Thereafter, a film-forming slurry having the same composition as the first film, plus a solvent therefor, is applied to a second face of the grid opposing the first face so as to provide a second film and such that the solvent in the slurry dissolves at least a portion of the first film and promotes solvent bonding of the films with the grid embedded therein. A polymeric backing film treated with plasma and defining a separator is used as a manufacturing process aid, thereby eliminating the step of using a carrier film onto which the electrodes are fabricated and stripping off the carrier and discarding the same. Treating the separator with plasma enhances surface energy thereby improving the lamination process of the film-forming slurries to the separator and reducing degradation of the separator.

A battery separator for a lithium battery is disclosed. The separator has a microporous membrane and a coating thereon. The coating is made from a mixture of a gel forming polymer, a first solvent, and a second solvent. The first solvent is more volatile than the second solvent. The second solvent acts as a pore former for the gel-forming polymer.

An organic electrolytic solution and a lithium secondary battery employing the same, wherein the organic electrolytic solution for a lithium secondary battery includes a polymer adsorbent having an ethylene oxide chain capable of being adsorbed into a lithium metal, a material capable of reacting with lithium to form a lithium alloy, a lithium salt, and an organic solvent. The organic electrolytic solution may be applied to all types of batteries including lithium ion batteries, lithium polymer batteries and lithium metal polymer batteries using a lithium metal for a negative electrode material, and the like. In particular, when the organic electrolytic solution is utilized in a lithium metal polymer battery, it serves to stabilize the lithium metal, and to increase the lithium ionic conductivity, thereby improving the cycle characteristics and charging / discharging efficiency of the battery.

The invention relates to a method for the balanced charging of n cells which form a lithium-ion or lithium-polymer battery and which are connected in series. The invention is characterised in that the method consists in monitoring the charge levels of the different cells (1) from the moment (t1) following the beginning of the battery (2) charging operation until said operation ends normally or is interrupted; and, as a function of the pre-evaluation of said charge levels, either powering all of the cells (1) uniformly or balancing the cell (1) charge levels by powering same in a differentiated manner as a function of the current charge levels thereof.