Takasaki, Japan
Takasaki, Japan

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Patent
Tyco Electronics and FDK Twicell Co. | Date: 2013-03-13

Disclosed are: a battery pack comprising a PTC device and a secondary battery; and a PTC device which enables the reduction in size of an electric device such as a dry-cell-type secondary battery. The PTC device comprises(1) a PTC element which comprises(A) a layered polymer PTC element comprising(a1) an electrically conductive filler and(a2) a polymeric material and(B) a PTC element comprising metal electrodes arranged on both surfaces of the polymer PTC element and(2) a lead of which at least a part is placed on each of the metal electrodes in the PTC element and which is connected to the metal electrodes through an electrically conductive material, wherein an exposed part of the electrically conductive material is covered with a protective member which comprises a material capable of absorbing or including an alkali.


Patent
FDK Twicell Co. | Date: 2014-05-07

A nickel hydride secondary battery (2) houses an electrode group (22) composed of a positive electrode (24) and a negative electrode (26) which are overlapped with each other via a separator (28) with an alkaline electrolyte solution, the negative electrode (26) includes a hydrogen absorbing alloy (42), a negative-electrode additive agent (44) for suppressing self-discharge, a thickening agent (46), and a conductive material (48), and the negative-electrode additive agent (44) includes at least one selected from calcium fluoride, calcium sulfide, and calcium chloride. It has been found that these negative electrode additive agents (44) are effective in limiting the self-discharge of the battery (2) without having the drawback of inhibiting the function of the thickening agent (46). A nickel hydride secondary battery (2) which shows a limited self-discharge and a high capacity can therefore be manufactured.


A nickel-metal hydride secondary cell (2) holds therein an electrode group (22) and an alkaline electrolyte solution containing NaOH as a main constituent of its solute. The electrode group has a positive electrode (24) and a negative electrode (26) lapped one over the other with a separator (28) therebetween. The negative electrode (26) contains a hydrogen absorbing alloy having a composition represented by the general formula: (RE_(1-x)T_(x))_(1-y)Mg_(y)Ni_(z-a)Al_(a) (where RE is at least one element selected from among Y, Sc and rare-earth elements, T is at least one element selected from among Zr, V and Ca, and subscripts x, y, z and a are values respectively satisfying 0 x, 0.05 y 0.35, 2.8 z 3.9, and 0.10 a 0.25), the hydrogen absorbing alloy has a crystal structure in which an AB_(2) subunit and an AB_(5) subunit are superimposed one upon the other, and Cr is substituted for part of the Ni.


Patent
FDK Twicell Co. | Date: 2013-03-27

A battery unit 1 comprises cell blocks 20, a circuit board 40 arranged below the cell blocks 20, a metallic receiving member 30 arranged between the cell blocks 20 and the circuit board 40 to receive an electrolyte leaking out of cells 21 constituting the cell blocks 20, an absorbent sheet 51 arranged in the metallic receiving member 30, and pedestals 52 arranged in the metallic receiving member 30 to support the cell blocks 20, thereby positioning the cell blocks 20 not to contact the absorbent sheet 51.


Patent
FDK Twicell Co. | Date: 2013-01-02

A negative-electrode plate 22 for use in a cylindrical cell, intended to be laid over a positive-electrode plate 21 with a separator 23 interposed between and rolled to form a cylindrical electrode body 20, with the positive-electrode plate 21 inside, the electrode body being arranged in a bottomed cylindrical outer can 10 to form the cylindrical cell, comprises a first negative-electrode part 22a which is to face the positive-electrode plate 21 on either side, with the separator 23 between, when formed into the electrode body 20, and a second negative-electrode part 22b which is to form the innermost circumference of the electrode body 20 and face the positive-electrode plate 21 only on one side, with the separator 23 between, when formed into the electrode body 20, the second negative-electrode part 22b being lower in negative-electrode active material density than the first negative-electrode part 22a.


Patent
Fdk Twicell Co. | Date: 2013-10-29

A nickel hydride secondary battery houses an electrode group including a positive electrode and a negative electrode which are overlapped with each other via a separator with an alkaline electrolyte solution, the negative electrode includes a hydrogen absorbing alloy, a negative-electrode additive agent, a thickening agent, and a conductive material, and the negative-electrode additive agent includes at least one selected from calcium fluoride, calcium sulfide, and calcium chloride.


Patent
FDK Twicell Co. | Date: 2013-10-02

A nickel hydrogen rechargeable battery (2) contains an electrode group (22) made up of a positive electrode (24) and a negative electrode (26) put together with a separator intervening therebetween. The positive electrode (24) includes positive-electrode active material particles (36) each having a base particle (38) composed mainly of nickel hydroxide and a conductive layer (40) that covers the surface of the base particle (38) and is made from a Co compound containing Li. The negative electrode (26) includes a rare earth-Mg-Ni-based hydrogen storage alloy (44) containing a rare-earth element, Mg and Ni. The total amount of Li contained in the battery (2) is set in a range of from 15 to 50 (mg/Ah) on the condition that the Li is converted into LiOH, and that the total amount of Li is found as a mass per Ah of positive electrode capacity.


A nickel-metal hydride secondary cell holds therein an electrode group and an alkaline electrolyte solution containing NaOH as a main constituent of its solute. The electrode group has positive and negative electrodes lapped one over the other with a separator therebetween. The negative electrode contains a hydrogen absorbing alloy having a composition represented by the general formula: (RE_(1-x)T_(x))_(1-y)Mg_(y)Ni_(z-a)Al_(a )(where RE is at least one element selected from among Y, Sc and rare-earth elements, T is at least one element selected from among Zr, V and Ca, and subscripts x, y, z and a are values respectively satisfying 0x, 0.05y0.35, 2.8z3.9, and 0.10a0.25), the hydrogen absorbing alloy has a crystal structure in which an AB_(2 )subunit and an AB_(5 )subunit are superimposed one upon the other, and Cr is substituted for part of the Ni.


Patent
Fdk Twicell Co. | Date: 2013-03-15

A nickel hydrogen rechargeable battery contains an electrode group made up of positive and negative electrode put together with a separator intervening therebetween. The positive electrode includes positive-electrode active material particles each having a base particle composed mainly of nickel hydroxide and a conductive layer that covers the surface of the base particle and is made from a Co compound containing Li. The negative electrode includes a rare earth-MgNi-based hydrogen storage alloy containing a rare-earth element, Mg and Ni. The total amount of Li contained in the battery is in a range of from 15 to 50 (mg/Ah) on the condition that the Li is converted into LiOH, and that the total amount of Li is found as a mass per Ah of positive electrode capacity.


Patent
FDK Twicell Co. | Date: 2013-12-04

An alkaline rechargeable battery (2) comprises an electrode assembly (22) formed of a positive electrode (24) and a negative electrode (26) stacked with a separator (28) interposed between and an alkaline electrolyte, wherein the positive electrode (24) holds a positive electrode mixture containing positive-electrode active material particles (36), each comprising of a base particle (38) formed primarily of nickel hydroxide, coated with a conducive layer (40) of a Co compound containing Li, and a positive-electrode additive (50) containing aluminum hydroxide, distributed between the positive-electrode active material particles, where the amount U of the positive-electrode additive (in parts by weight) relative to 100 parts by weight of the positive-electrode active material particles satisfies 0.01U<1.5, and wherein Li is present within the alkaline rechargeable battery (2), where the total amount of Li present within the alkaline rechargeable battery (2), in terms of weight of LiOH per unit positive-electrode capacitance 1Ah, is between 20 and 30 (mg/Ah).

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