Abstract:
A current interrupt mechanism for electrochemical cells is disclosed. A thermally activated current interrupt mechanism (38) is integrated into an end cap assembly (10) for an electrochemical cell. The thermally responsive mechanism preferably includes a free floating bimetallic disk (40) or a meltable mass of material (fig. 4, 175) to break an electrical pathway within the end cap assembly. The end cap assembly may also include integrated therein a pressure responsive current interrupt mechanism (48). The pressure responsive mechanism activates to sever an electrical pathway within the end cap assembly (10) to prevent current from passing through the cell, and includes a diaphragm (70) which ruptures when there is extreme gas pressure buildup.
Abstract:
A method of making lithium manganese oxide of spinel structure is disclosed. The method involves the step of prelithiating a manganese oxide by reacting it with lithium hydroxide or lithium salt and then reacting the prelithiated manganese oxide in a second step at elevated temperature to form a lithium manganese oxide spinel. In a specific embodiment manganese dioxide powder is reacted with lithium hydroxide to prelithiate the manganese dioxide and the prelithiated manganese dioxide is separated from the reaction mixture and heated and reacted with lithium carbonate at elevated temperature to convert it to lithium manganese oxide spinel. The spinel product may be used advantageously in secondary (rechargeable) batteries.
Abstract:
A condition indicator assembly (tester) for determining the condition of a main cell, e.g. a battery, is disclosed. The condition indicator assembly may comprise an electrochemical indicator cell connected in series to an auxiliary cell. The indicator cell and auxiliary cell each have an anode, cathode and electromotive force (e.m.f.) of its own. The condition indicator assembly may be permanently connected in parallel to the terminals of a main cell being tested. The condition indicator assembly is thin enough that it may be integrated into a label for the main cell. As the main cell discharges, the indicator cell anode clears proportionally to the discharge of one of the electrodes of the main cell to provide a continuous visually discernible indication of the state of charge of the main cell. 00000
Abstract:
The efficacy of a passivating layer in a rechargeable lithium ion cell is increased by heating the charged cell and storing the charged cell for a predetermined period of time.
Abstract:
A light transparent moisture barrier (70) useful for preventing moisture from destroying the effectiveness of a moisture sensitive cell condition tester (60) on an electrochemical cell (50) comprises a plurality of very thin, alternating layers (40, 38) of an inorganic material and an organic material on a flexible, polymeric substrate. The layers are not laminated, but are formed on the substrate (12) by a deposition or coating process and the thickness of the layer is less than 5 microns. The organic material is a hydrophobic polymer and the inorganic material is a metal oxide, nitride, a glass or silicon.
Abstract:
A smart battery (10) which provides electrical power and which reports predefined battery parameters to an external device (16) having a power management system, includes: at least one rechargeable cell connected to a pair of terminals (16) to provide electrical power to an external device (16) during a discharge mode and to receive electrical power during a charge mode, as provided or determined by the remote device; a data bus (14) for reporting predefined battery identification and charge parameters to the external device; and an analog signal (24) representative of battery temperature at the cell; a hybrid integrated circuit having a microprocessor for receiving the analog signals and converting them to digital signals representative of battery voltage, current and temperature and calculating actual charge parameters over time from the digital signals, the calculations including one calculation according to the following algorithm; CAPrem = CAPFC- SIGMA Id DELTA td - SIGMA Is DELTA t + SIGMA epsilon cIc DELTA tc wherein epsilon c is a function of battery temperature and CAPFC. Superimposed on this equation is the reset logic, that self corrects the value of CAPFC with a capacity calculation at each full charge and each end of full discharge.
Abstract translation:提供电力并且向具有电力管理系统的外部设备(16)报告预定义的电池参数的智能电池(10)包括:连接到一对端子(16)的至少一个可充电电池,以向 在放电模式期间的外部设备(16)并且在充电模式期间接收由远程设备提供或确定的电力; 数据总线(14),用于向外部设备报告预定义的电池标识和电荷参数; 和表示电池温度的模拟信号(24); 具有微处理器的混合集成电路,用于接收模拟信号并将其转换成代表电池电压,电流和温度的数字信号,并且从数字信号中随时间计算实际电荷参数,所述计算包括根据以下算法的一次计算; CAPrem = CAPFC-SIGMA Id DELTA td - SIGMA是DELTA t + SIGMAεcIc DELTA tc其中εc是电池温度和CAPFC的函数。 在该方程上叠加的是复位逻辑,其自身通过在每个完全充电和每次完全放电结束时的容量计算来自动校正CAPFC的值。
Abstract:
A label (10) for an electrochemical cell with a condition tester for the cell integrated with the label to form a label/tester composite (11) is disclosed. The label/tester composite has a thermochromic material (12) in thermal contact with an electrically conductive material (40). A substructure containing a cured conductive material and preferably also a thermochromic material is formed on a releasable web and transferred from the releasable web to the inside surface of the heat shrinkable base film. A partition coating (60) may be applied over the transferred conductive material. Preferably, a sheet of paper or plastic film (210) having a large window (220) opening therein for entrapping air is applied over the partition coating and aligned over the heat generating portion of the conductive material. The label/tester composite is applied to the cell housing with the insulating paper or plastic film with the window opening against the cell housing. The tester may be activated by depressing one or two regions on its surface thereby connecting the conductive material to the terminals of the cell, whereupon the conductive material becomes heated causing a change in appearance of the thermochromic material to indicate the condition of the cell.
Abstract:
An electrochemical cell has a wheel shaped molded plastic seal member (10) of a unitary construction which includes a central cylindrical hub (12) from which depend in outward radial sequence, an annular pressure vent (18), a boss (26), a downward projecting skirt (30), an annular flexure means (38), for providing radial movement and an outer rim terminating at its periphery in a cylindrical wall (40). The pressure vent (18) includes a thin membrane ring (22) depending from the hub (12) which joins the hub (12) to an annular diaphragm (20). A hinged ring (24) joins the periphery of the diaphragm (20) to the boss (26). The seal (10) member is designed so that the membrane ring (22) fails primarily in shear at excessive cell pressure which makes the vent (18) more reliable and easier to fabricate.
Abstract:
A decorative jacket (36) for a battery cell (10) and the jacket applied to the cell, are disclosed. The jacket (36) is a flat-wrap label, preferably formed of a single heat-shrinkable polymeric film (28) and non-metallic ink design (70) imprinted on the inside surface of the film (28). The film (28) and ink design (70) resist corrosion when exposed to corrosive atmospheres. The ink design (70) is not electrically conductive. The label (30) is applied by wrapping it around the cell outer surface with the ink design (70) and inside surface of the film (28) facing the cell (10). Preferably the entire label (30) is subjected to a quick dose of heat to snap extended portions of the label (30) over the top and bottom edges (shoulders) of the cell (10).
Abstract:
The invention relates to the manufacture of manganese dioxide by a chemical process. The resulting manganese dioxide product takes the form of particles characterized by filament-like protrusions jutting out from its surface. The manganese dioxide particles having such surface features can be manufactured by reacting manganese sulfate with sodium peroxodisulfate in an aqueous solution. The process can be controlled to yield high density manganese dioxide. The manganese dioxide formed in the process can be deposited directly onto the surface of electrolytic manganese dioxide (EMD). The manganese dioxide product is particularly suitable for use as a cathode active material in electrochemical cells.