Abstract: An electrode plate unit capable of suppressing the internal short circuit caused by flashing that is formed on the end portion of a positive electrode plate and a battery using the same. The electrode plate unit includes a group of electrode plates in which a plurality of positive electrode plates and a plurality of negative electrode plates are laminated alternately via separators, a positive electrode collector plate connected to one side face of the group of electrode plates for connection to the positive electrode plate, and a negative electrode collector plate connected to another side face of the group of electrode plates for connection to the negative electrode plate, wherein the edge portion of the positive electrode plate is protruded from the edge portion of the negative electrode plate on the entire side face excluding the side face to which the negative electrode collector plate of the group of electrode plates is connected.

Abstract: An electrode plate unit capable of suppressing the internal short circuit caused by flashing that is formed on the end portion of a positive electrode plate and a battery using the same. The electrode plate unit includes a group of electrode plates in which a plurality of positive electrode plates and a plurality of negative electrode plates are laminated alternately via separators, a positive electrode collector plate connected to one side face of the group of electrode plates for connection to the positive electrode plate, and a negative electrode collector plate connected to another side face of the group of electrode plates for connection to the negative electrode plate, wherein the edge portion of the positive electrode plate is protruded from the edge portion of the negative electrode plate on the entire side face excluding the side face to which the negative electrode collector plate of the group of electrode plates is connected.

Abstract: A lithium ion secondary battery includes: (a) a positive electrode plate comprising an active material part and a current collector carrying the active material part, the active material part comprising a positive electrode active material capable of absorbing or desorbing a lithium ion during charge and discharge; (b) a negative electrode plate comprising an active material part and a current collector carrying the active material part, the active material part comprising a negative electrode active material capable of absorbing or desorbing a lithium ion during charge and discharge; (c) a separator interposed between the positive and negative electrode plates; (d) an electrolyte; and (e) a battery case accommodating the positive and negative electrode plates, the separator, and the electrolyte. The positive and negative electrode plates are wound with the separator interposed therebetween, thereby to form an electrode plate assembly.

Abstract: A lithium ion secondary battery is so designed as to facilitate the insertion of the top insulator plate and to secure the fixation of the electrode group. This structure can reduce the probability of the electrode group moving around in the battery case to be damaged when the battery is dropped or shocked, thereby maintaining high safety standards even when a high pressure is applied from outside the battery. In a lithium ion secondary battery provided with a safety valve and composed of an electrode group which consists of a band-shaped positive electrode plate and a band-shaped negative electrode plate wound together with a separator disposed therebetween and which is housed in a cylindrical metal battery case with a bottom, together with a top insulator plate, the top insulator plate is designed to be elastic and is provided in its center with a through hole into which a center core member is press-fitted.

Abstract: A sealed rechargeable battery module wherein a safety vent device is provided to release the internal pressure of the battery when the pressure has reached a predetermined value. The safety vent device includes a valve case formed with a vent and a sealing protrusion surrounding this vent. A valve body inserted in the valve case includes a sealing portion that is brought in tight contact with the sealing protrusion, a rigid holder for supporting the sealing portion, a and a resilient portion for pressing the rigid holder toward the vent. A valve cover is formed with apertures for closing the upper open end of the valve case. In a state, the resilient portion of the valve body is compressed.

Abstract: A battery assembly includes a plurality of battery modules electrically connected together, each battery module acting as a secondary battery and including an electrode group, an electrolyte, a container for housing the electrode group and the electrolyte, and a safety valve operating in accordance with the internal pressure of the container. The working pressure of each safety valve is set so that the safety valve of at least one battery module is opened when the at least one battery module has its maximum internal pressure or less during the charge equalization. It is possible to provide a battery assembly that can improve the reliability of the container strength by keeping the working pressure of each safety valve lower than the pressure that the container resists even under elevated temperature conditions.

Abstract: An electrode plate unit capable of suppressing the internal short circuit caused by flashing that is formed on the end portion of a positive electrode plate and a battery using the same. The electrode plate unit includes a group of electrode plates in which a plurality of positive electrode plates and a plurality of negative electrode plates are laminated alternately via separators, a positive electrode collector plate connected to one side face of the group of electrode plates for connection to the positive electrode plate, and a negative electrode collector plate connected to another side face of the group of electrode plates for connection to the negative electrode plate, wherein the edge portion of the positive electrode plate is protruded from the edge portion of the negative electrode plate on the entire side face excluding the side face to which the negative electrode collector plate of the group of electrode plates is connected.

Abstract: The present invention provides a thermofixable photosensitive recording material comprising a substrate and a recording layer formed thereon in which a pyrazolone derivative represented by the formula (1 ) shown in the specification and functions as a color former, and a hydroquinone derivative and an acidic substance which function as a color forming auxiliary agent or fixing auxiliary agent are dissolved mutually therein.Further, a binder can be added as required to the recording layer, thereby four components are dissolved mutually therein.

Abstract: The invention provides a heat-sensitive recording medium comprising (a) a support and (b) a heat-sensitive recording layer formed on the support and comprising a colorless or pale-colored basic dye and a color developing material capable of causing color development upon contact with the dye by heating, which medium is characterized in that the heat-sensitive recording layer contains at least one phosphate compound selected from the group consisting of 2,2'-methylenebis(4,6-di-tert-butylphenyl) phosphate of the general formula (1) shown below and alkali metal, ammonium and polyvalent metal salts thereof: ##STR1## wherein R represents a tert-butyl group.

Abstract: Disclosed is a heat-sensitive recording material comprising (A) a support and (B) a heat-sensitive recording layer formed on the support and containing a colorless or pale-colored basic dye and a color developing material which develops a color on contact with the dye, the recording material being characterized in that the color developing material comprises at least one member selected from the group consisting of o-naphthoic acid and polyvalent metal salts thereof.

Abstract: The invention provides a heat-sensitive recording material comprising (a) a base sheet and (b) a heat-sensitive recording layer formed on the base sheet and comprising a colorless or pale-colored basic dye, a color developing material which develops a color on contact with the dye, and a heat-fusible material, the recording material being characterized in that the basic dye comprises 3-di(n-butyl)amino-6-methyl-7-phenylaminofluoran, and that the heat-fusible material comprises di(p-methylbenzyl) oxalate.

Abstract: A heat-sensitive recording material comprises a recording layer formed on a base sheet where the recording layer comprises a colorless or pale colored basic chromogenic material, a color developing material which develops a color by contacting with said chromogenic material, and a stabilizer.

Abstract: A heat sensitive recording material comprising a substrate and a heat sensitive recording layer thereon incorporating a colorless or light-colored basic dye and a color acceptor reactive with the dye to form a color when contacted therewith, the recording material being characterized in that the material has a heat sensitive recording layer having incorporated therein (1) a heat-fusible substance exhibiting a weight reduction of at least 5% at 200.degree. C. based on the weight at 25.degree. C. under the condition of 20.degree. C./min in the rate of rise of temperature, (2) a wax, (3) a lubricant, and (4) an oil-absorbing pigment at least 85 ml/100 g in oil absorption.

Abstract: An improved heat-sensitive recording material having a substrate and a heat-sensitive recording layer formed thereon which contains a colorless or light-colored basic dye and a color developer to color said basic dye upon contact by heating, said heat-sensitive recording layer being formed by applying a coating dispersion containing prismatic calcium carbonate comprising single particles each having such a particle size that the average length is 1 to 6 .mu.m and the average breadth is 0.1 to 0.6 .mu.m. The heat-sensitive recording material does not generate any foreign matter to contaminate the recording head and it does not cause reduction in the whiteness of the recording layer with the lapse of time.

Abstract: A heat-sensitive record material having on a base sheet a recording layer which comprises a basic colorless chromogenic material and an acceptor in the state of that the colorless chromogenic material is contacted with the acceptor by heating to produce color images. The recording layer comprises at least one phenol compound represented by the following formula (I) together with the colorless chromogenic material and the acceptor, ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 radicals is hydrogen, C.sub.1-8 alkyl or C.sub.5-8 cycloalkyl, but at least one of R.sub.1, R.sub.2 and R.sub.3 radicals is C.sub.5-8 cycloalkyl; and each of R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 radicals is hydrogen or C.sub.1-8 alkyl.

Abstract: A heat-sensitive recording material excellent in stability of recorded images is disclosed, which comprises a support having formed thereon a heat-sensitive recording layer comprising a colorless or pale-colored basic dye and a color developer capable of forming a color upon coming into contact with the basic dye, wherein said heat-sensitive recording layer further comprises at least one compound selected from the compounds represented by following formulae (I) and (II): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8 independently represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms.

Abstract: This invention provides a heat-sensitive recording material comprising a base sheet and a heat-sensitive record layer formed over the base sheet and containing a color forming material and a color developing material which undergoes a color forming reaction on contact with the color forming material, the heat-sensitive recording material being characterized in that a resin layer containing a cationic-modified starch is formed over the heat-sensitive record layer.The resin-coated heat-sensitive recording material of the invention is free of sticking, and resistant to diazo developer and suppresses the powder-coated phenomenon due to the bleeding of crystallized color forming material, color developing material and the like.

Abstract: Novel phenolic compounds useful as a color developer suitable for satisfying the quality requirements of heat-sensitive recording materials are provided, which compounds are expressed by the general formula ##STR1## wherein R.sub.1 represents an alkyl group or a cycloalkyl group and R.sub.2 represents hydrogen atom or an alkyl group; and also heat-sensitive recording materials usable in a broad application field are provided, which recording materials are provided with a heat-sensitive recording layer composed mainly of a colorless basic dye and the above compounds as a color developer by which the dye forms colors, overlaid on a substrate.

Abstract: This invention provides a heat-sensitive record material comprising a base sheet and a heat-sensitive record layer formed over the base sheet and containing a colorless or pale-colored basic dye and a color developing material capable of forming a color when contacted with the dye, the record material being characterized in that the heat-sensitive record layer contains as the color developing material at least one compound represented by the formula ##STR1## wherein R.sub.1 and R.sub.2 are each alkyl having 1 to 8 carbon atoms, a group ##STR2## or a group ##STR3## wherein R.sub.3 and R.sub.4 are each a hydrogen atom, chlorine atom, hydroxyl or alkoxy having 1 to 8 carbon atoms, the heat-sensitive record layer further containing at least one compound selected from the group consisting of 1,1-bis(4-hydroxyphenyl)cyclohexane and hindered phenol compounds.

Abstract: In a heat-sensitive recording material incorporating a colorless or pale-colored basic dye and a color acceptor which is reactive with the basic dye to form a color when contacted therewith, the recording material characterized in that at least one compound represented by the formula ?I! is contained in a heat-sensitive recording layer ##STR1## wherein X is --O-- or --COO--, R.sub.1 to R.sub.4 are each hydrogen atom, alkyl having 1 to 8 carbon atoms, aryl having 6 to 10 carbon atoms, aralkyl having 7 to 9 carbon atoms, chlorine atom, acetyl, propionyl, methoxy, methylthio, methoxycarbonyl, cyano, nitro or cyclohexenyl, substituents R.sub.1 and/or R.sub.2 or substituents R.sub.3 and R.sub.4 may link together to form aromatic ring(s), n is an integer of 1 to 10.