CN101083313B - Alkaline dry cell - Google Patents

Abstract

An alkaline dry cell, wherein a cathode and an anode, a separator placed between these electrodes, and electrolyte are housed in a external can with a cylindrical shape, which having a bottom lid. A resin sealing member and a supporting member for supporting it from the inner circumferential portion are mounted in the external can, and the opening of the external can is sealed by tightening the resin sealing member with the external can and the supporting member. In such a configuration, a metal plate also servers as anode terminal plate is used as the supporting member; the entire outer circumferential portion of the metal plate serves as holding portion of resin sealing member, and a curved portion is formed into a curved shape with an average curvature radius of not more than 1 mm and shows an arc shape over an angle range greater than 90 degrees is installed on the cross section formed by cutting the metal plate in the thickness direction through the center thereof.

Description

Alkaline dry battery

Technical field

The present invention relates to a kind of Sealing Technology of tubular alkaline dry battery.

Background technology

" the whole general structure of tubular alkaline dry battery "

Existing tubular alkaline dry battery is, for example as shown in figure 15, at the dual-purpose positive terminal round-ended cylinder shape encapsulating shell 1 inside (element cell C) arranged, in dress anodal 2 and negative pole 4, the dividing plate 3 of configuration therebetween, the negative pole current collecting bar 5 that inserts the spike of negative pole 4, dipping dividing plate 3 and anodal 2 electrolyte (not shown), the open end 1a of encapsulating shell 1 is sealed the electrolyte that makes in the element cell C can not spill outside structure.

" shell of encapsulating shell is thick "

As the external diameter of No. three alkaline dry batteries of list of a tubular alkaline dry battery, be 13.5～14.5mm according to the JIS specification specifies, but the unified machine battery case size of using battery, external diameter is the standard on 14.0 ± 0.1mm has come true.Under external diameter is restricted, for the internal capacity (unit volume) that increases alkaline dry battery, seek to improve discharge capacity, shell that can the attenuate encapsulating shell is thick., if the shell of general killed steel (aluminum killed steel) the manufacturing and encapsulation shell that uses of attenuate alkaline dry battery is thick, the problem of encapsulating shell distortion etc. in the carrying operation during with regard to easy generation or processing difficulties or encapsulating shell course of conveying or battery assembling.Therefore, the shell of the encapsulating shell of No. three alkaline dry batteries of list of the present domestic sale the thinnest thick 0.18mm that also wants.

" structure of closure part "

Closure part at the tubular alkaline dry battery, shown in Figure 16 amplifies, be equipped with: have press in preventing abnormal ascending be the relief valve mechanism of explosion-proof usefulness resin system seal body 6, from interior week with the support unit 107 of its supporting, and to figure the negative terminal plate (negative terminal) 207 of top formation convex (cap shape).Wherein, resin system seal body 6 is by the lug boss 61 that keeps negative pole collector plate 5, with inner peripheral surface peripheral part 62, the part in succession of encapsulating shell 1 connecting portion 63 of thinner wall section (working point of the safety valve) 63a of the explosion-proof usefulness of explosion-proof usefulness and connection bump portion 61 and peripheral part 62 is set and constitutes.And, when the pressure in inner pressure of battery is element cell C rises to more than the authorized pressure, shown in chain-dotted line among the figure, connecting portion 63 dilatancies, press when rising further, as shown in figure 17, because the thinner wall section 63a of explosion-proof usefulness breaks (safety valve action in other words), interior pressure just discharges to the outside.And resin system seal body 6 blocks the top of element cell C, prevents that electrolyte from spilling, simultaneously to carrying out electric insulation between the encapsulating shell 1 that becomes positive electrode collector and the negative terminal plate 207 as negative electrode collector.In addition, among Figure 16 and Figure 17, label 107f also 07f represents to be used for the steam vent that the interior gas that takes place of element cell C is emitted to the outside respectively.

This resin system seal body 6, employing makes its peripheral part 62 under the state between support unit 107 and the encapsulating shell 1, clamp with the marginal portion of the open end 1a of encapsulating shell 1 and to be riveted on inboard way, be installed in the open end 1a of encapsulating shell 1 (in this specification, this mouth-sealing method being called " horizontal clamping cause seal " or " horizontal clamping is sealed ").At this moment, if a little less than the rivet force, even the electrolyte of inside battery in the time of initial (potassium hydroxide is the strong base solution of principal component) does not spill, vary with temperature later on etc., adaptation between resin system seal body 6 and the encapsulating shell 1 descends, and the electrolyte of inside battery will ooze out to the outside from the boundary member of resin system seal body 6 with encapsulating shell 1 soon.Thereby, in existing tubular alkaline dry battery, as support unit 107 from interior Zhou Zhicheng resin system seal body 6, employing has desired thickness (generally, about 0.6～0.75mm) metal washer (the discoid metallic plate that middle body is porose), when the peripheral part 62 to resin system seal body 6 clamps, by supporting securely with metal washer from its inboard, enable from the outside with enough power, peripheral part 62 riveted joints of the open end 1a of encapsulating shell 1 with resin system seal body 6.

Summary of the invention

" problem 1 (common problem) "

For above-mentioned this tubular alkaline dry battery, a kind of method that improves discharge capacity is exactly the internal volume that increases battery.Each invention of the application is exactly improving discharge capacity as common purpose by increasing the battery internal volume, and as prerequisite and then with these problems of following narration way as solution.

" problem 2 "

At first, the present application people improves discharge capacity in order to seek to increase internal volume in No. three alkaline dry batteries of list of one of tubular alkaline dry battery, attempts the thin encapsulating shell that adopts thickness 0.18mm following.Consequently, owing to take all improvement measures, can overcome the problem that the encapsulating shell of saying the front is processed distortion when going up difficulty or conveying.But when the thickness of encapsulating shell was reduced to also thinner than 0.18mm, the result that the riveting intensity of closure part reduces had run into the new problem of oozing out electrolyte inside from closure part.

Above-mentioned seal body 6 during assemble, be to assemble thereon after negative pole current collecting bar 5 or the negative terminal plate 207 etc., insert in the open end 1a of encapsulating shell 1, under this state, clamp the peripheral part 62 of seal body 6 by means of metal washer (metallic plate) 107 by means of encapsulating shell 1, from interior week from periphery, by riveted joint, be installed in the open end 1a of encapsulating shell 1.At this moment seal body resin distortion fits the inside of the peripheral part 62 extruding encapsulating shells 1 of seal body 6 with its elastic force.Consequently, cover the gap of going up the small concavo-convex generation that exists by peripheral part 62 surfaces (with the contact-making surface of encapsulating shell 1) of seal body 6, prevent that the strong strong basicity liquid (electrolyte) of seepage of water that is loaded on inside battery from oozing out to the outside.

; as adopt thin encapsulating shell below the thickness 0.18mm, because reduced thickness reduces the intensity of encapsulating shell 1, thereby can not be with the distortion of encapsulating shell 1 extruding sealing body resin; consequently, from the small concavo-convex electrolyte that oozes out inside battery to the outside between the seal body resin.Particularly, if add the anxious strong variations in temperature of battery, become along with the expansion of material, contraction infiltrating of electrolyte taken place easily.The leakproof test that the inventor carries out, specifically, for the thermostat that repeats per 30 minutes from-10 ℃ to 60 ℃ variations in temperature, preserving battery after 3 days, investigation has the test of the closure part leakage of having no way of, can think that leakage takes place encapsulating shell thickness when 0.18mm is following, and can not prevents leakage with existing way.

In the present invention, in order to increase discharge capacity,, when adding anxious strong variations in temperature, the electrolyte of inside battery is spilt to the outside even be under the situation of the encapsulating shell below the 0.18mm at used thickness.This is an one object of the present invention.

" problem 3 "

Secondly, the present application people payes attention to the thickness of closure part in order to seek to increase the inside battery volume.For the tubular alkaline dry battery, because central authorities' one side part of negative terminal plate 207, be that the part of terminal surface makes convex form and in fact become standard, as support unit 107 from the peripheral part 62 of interior Zhou Zhicheng seal body 6, possess metal washer (below, metal washer is also used label 107 as required) Figure 15 and this existing the sealing in the structure shown in Figure 16, there are 2 gaps, the i.e. space S 2 of the space S 1 of connecting portion 63 sides of seal body 6 and negative terminal plate 207 sides up and down in the cell height direction of seizing metal support plate 107 on both sides by the arms.After this, the former space S 1 be for the connecting portion 63 of the seal body 6 that allows to rise or its thinner wall section 63a distortion along with internal pressure also be necessary part, yet the latter's S2 forms owing to negative terminal plate 207 face side become convex shape, and is the nonuseable part that can not have originally.Because there is so useless S2 in closure part, seal in the structure existing, have to make the thickness of whole closure part to be about to volume and too increase to more than the needs, obviously existing restriction and that part of discharge capacity that the volume of element cell C of the filling active material of direct relation is arranged is the problem of the internal volume of battery.

So, for the volume that makes closure part is not greater than needs, can consider to abolish metal washer 107, replace and utilize negative terminal plate 207, as support unit from inboard supporting seal body 6.But, because of the reason on the cost of manufacture, thickness is used for negative terminal plate 207 than metal washer 107 thin members (general thickness is 0.4mm), when adopting above-mentioned way, when the riveted joint seal body 6, can make negative terminal plate 207 distortion, the power that clamps the peripheral part 62 of seal body 6 will be enough inabundant.Therefore, when adding in the battery anxious strong variations in temperature etc., the danger that spills electrolyte inside via encapsulating shell 1 between seal body 6 to the outside is just arranged.

Among the present invention, in possessing the tubular alkaline dry battery of resin system seal body, as support unit from interior Zhou Zhicheng seal body, use 1 metallic plate of holding a concurrent post negative terminal plate (negative terminal), try every possible means by shape simultaneously, make that the thickness of closure part or volume can be greater than more than the needs, and then the internal volume that increases battery reaches the raising battery capacity its peripheral part, even during variations in temperature etc., accomplish that also the electrolyte in the battery can not spill the outside sometimes.This also is an one object of the present invention.

" problem 4 "

And, when the support unit that supports seal body 6 internally during only as negative terminal plate, form closure part by riveted joint after, have the height tolerance of negative terminal plate.To describe this height tolerance phenomenon below in detail.In addition, as the back is narrated, as the peripheral part in negative terminal plate be provided with below the mean radius of curvature 1mm and also angle than the also big sweep (bend) of 90 degree, along with work hardening forms good riveted joint, just can prevent that inner highly basic electrolyte stream from going out the outside, thereby, below illustrate the negative terminal plate that peripheral part has been applied bending machining.

Figure 11 is an illustration of this negative terminal plate of expression.The negative terminal plate 307 of accompanying drawing institute example can divide into the termination contact of battery applications machine with 3 zones such as the side 379 of supplying with terminal surface 377 that electric power is purpose, this terminal surface 377 and flange surfaces 378.When the peripheral part of anticathode terminal board 307 applied bending machining, flange surface 378 can be divided into the part (bend 378b) of bending machining and compare flat portions (par of flange surface) 378a with it.

In the operation that alkaline dry battery seals, be that the resin system seal body of being seized on both sides by the arms by negative terminal plate 307 and encapsulating shell with clamping is a purpose, make the encapsulating shell plastic deformation by riveted joint, yet at this moment radial stress components is added on the negative terminal plate 307.Make negative terminal plate 307 distortion by this stress, and with stress and parallel surface, stress and near the intersection point on the plane of an angle of 90 degrees degree) produce distortion as starting point, in Figure 11, just (intersection point of the par 378a of terminal surface side 379 and flange surface is out of shape as fulcrum with the A intersection point of terminal surface side 379 (terminal surface 377 with) and some B.Because distortion, some B raises with the origin-location sometimes and reduces sometimes, and both cause the difference in height of negative terminal plate 307.Before the riveted joint of the aspect ratio of negative terminal plate 307 or raise or reduce all different conditions of sealing process, cause disorderly action instability.

One deviation is arranged is exactly problem on the cell height.For example height tolerance is if 0.5mm at the interior machine of adorning 6 series-connected cells, then adds up to cell height generation maximum deviation 3mm on battery, and the set electricity of machine just can not got well, or battery takes place can not install to situation in the machine.Therefore, be example with No. three alkaline dry batteries of list of domestic sale, the height of battery approximately drops on 50.00mm ± 0.05mm scope.

If the present invention just in the alkaline dry battery that possesses resin system seal body, adopts negative terminal plate as from the support unit of interior Zhou Zhicheng resin system seal body the time, reduce the dimensional discrepancy that causes by the distortion of negative terminal plate in the sealing process as far as possible.This also is an one object of the present invention.

" problem 5 "

When the assembling alkaline dry battery, as previously described, resin system seal body 6, be after assembling negative pole current collecting bar 5 or negative terminal plate 207 etc. therein, insert in the open end 1a of encapsulating shell 1, in this state lower seal from periphery by means of encapsulating shell 1, from interior week 62 pairs of peripheral parts by means of 107 mouthfuls of bodies 6 of metal washer (metallic plate) clamp, by riveted joint, be installed in the open end 1a of encapsulating shell 1.At this moment seal body resin distortion fits the inside of the peripheral part 62 extruding encapsulating shells 1 of seal body 6 with its elastic force.

; thickness at connecting portion 63 is thinner; and in the part of its peripheral part 62 sides and the not too big existing seal body structure of the wall thickness difference of the part of lug boss 61 sides; seal body 6 or the 63 whole distortion of its connecting portion were big when horizontal clamping was sealed; the thinner wall section of the explosion-proof usefulness of connecting portion 63 (operating point of safety valve) 63a is last, and over-burden, promptly has the excessive problem of this thin-walled portion 63a stress.

In the present invention, just when so horizontal clamping is sealed, adopt the way that reduces the thinner wall section stress that acts on explosion-proof usefulness, improve reliability as this thin-walled portion of safety valve function.This also is an one object of the present invention.

" problem 6 "

In the alkaline dry battery that possesses resin system seal body 6, during the safety valve regular event, gas inside discharges to the outside by steam vent 107f, the 207f that is located on metal washer 107 or the negative terminal plate 207.Safety valve rises with inner pressure of battery and makes the connecting portion perk upward of seal body 6, when interior pressure becomes authorized pressure above the time, is cut off going forward side by side action and does owing to be located at the thinner wall section 63a of the explosion-proof usefulness of connecting portion 63.

; if adopt existing seal body structure; the thickness of connecting portion 63 is thinner; and because do not have too big wall thickness difference in the part of the part of its peripheral part 62 sides and lug boss 61 sides; so for example short circuit adstante febre seal body resin is softening; the result or before safety valve action connecting portion 63 extend the gas exhaust hole 107a that has stopped up metal washer 107; or at support unit owing to contact with negative terminal plate 207 when using negative terminal plate 207 in the metal washer, the generation internal gas is the steady problem of discharge not.And then when overdischarge was shelved, the safety valve action was undesired, and seal body 6 breaks, and content disperses or the big sound that breaks takes place thereupon.

In the present invention, just, make the safety valve regular event, improve short circuit adstante febre, the fail safe when overdischarge is shelved by the shape of change resin system seal body.This is again an one object of the present invention.

" the 1st invention "

The thickness one of encapsulating shell is thin, and the internal volume of battery increases, and the intensity of closure part just descends in addition.But because the thick internal volume with battery of the shell of closure part is irrelevant, inventor's research is made thicklyer than the shell of shell portion with the shell of closure part is thick, and can investigation guarantee the riveting intensity of closure part.Make the different housing of this thickness, just need to use to have sheet stock identical with the thick part of shell or its above thickness.Therefore, the inventor thinks that at closure part and the differentiated housing of shell portion thickness, the amount of plastic deformation that the ratio of thickness is got over the large cylinder part is also big, work hardening is worked strongly, and the work hardening of such shell portion has good influence to the riveted joint of closure part.

So, the inventor as a result that the encapsulating shell thickness that uses in single No. three alkaline dry batteries is painstakingly discussed finds out, if with the shell of closure part thick make thicker than the shell of shell portion, just can guarantee the riveting intensity of closure part, and its result can prevent the leak of liquid phenomenon that caused by variations in temperature.And conclude, particularly adopt the shell of closure part thick for the shell portion shell thick more than 1.4 times, can fully guarantee the riveting intensity of closure part, consequently prevent the leak of liquid phenomenon that causes by variations in temperature really.

The present invention finishes by above investigation, and in order to solve foregoing problem 1 and problem 2, as shown in Figure 1, the encapsulating shell that the round-ended cylinder shape is arranged 1 inside at alkaline dry battery, accommodate positive pole 2 and negative pole 4, Pei Zhi dividing plate 3 and electrolyte therebetween, and resin system seal body is installed and in the open end 1a of encapsulating shell 1 from its support unit of interior Zhou Zhicheng 7, employing is sealed by the way that encapsulating shell 1 and support unit 7 clamp resin system seal body 6, the thickness of shell portion B that it is characterized in that encapsulating shell 1 is thinner than 0.18mm, and the thickness of the closure part A of encapsulating shell 1 is more than 1.4 times of shell portion B thickness.And, the housing sheet stock of using is thick more, make the thickness sidewall thickness of housing (form) attenuation of housing just spend cost more by the attenuate pull and stretch, thereby " thickness of closure part A "/" thickness of shell portion B " that it is desirable to encapsulating shell 1 is below 2.5.The thickness of the shell portion B of encapsulating shell 1 it is desirable to more than the 0.1mm, so that guarantee certain intensity.

" the 2nd invention "

In the alkaline dry battery that possesses resin system seal body, use is held a concurrent post under the situation of metallic plate as support unit of negative terminal plate, the intensity one of the metallic plate (negative terminal plate) of inboard dies down during the riveted joint seal body, the power of extruding sealing body resin just weakens, its result causes the situation of electrolyte from spilling between seal body and the peripheral part.Thereby the inventor applies specific bending machining at the peripheral part of metallic plate, and the contact area of work hardening, metallic plate and seal body resin by increasing metallic plate has solved foregoing problem 1 and problem 2.

Promptly, as depicted in figs. 1 and 2, alkaline dry battery of the present invention, encapsulating shell 1 inside that the round-ended cylinder shape is being arranged, accommodate positive pole 2 and negative pole 4, Pei Zhi dividing plate 3 and electrolyte (figure do not show) therebetween, and resin system seal body 6 is installed and in the open end 1a of encapsulating shell 1 from its support unit of interior Zhou Zhicheng, employing is sealed by the way that encapsulating shell 1 and support unit clamp resin system seal body 6, it is characterized in that using 1 metallic plate 7 of holding a concurrent post negative terminal plate (below, be also referred to as negative terminal plate 7) as above-mentioned support unit, at the continuous whole periphery of the peripheral part of this negative terminal plate 7, as and encapsulating shell 1 between seize the part of resin system seal body 6 on both sides by the arms, section at the center by negative terminal plate 7 when thickness direction cuts off it is provided with the bend 78b below the mean radius of curvature 1mm that roughly is C word shape or arcuation.In addition, the mean radius of curvature r of so-called bend 78b as described later, is meant the curve to the periphery fringing of bend 78b section, and the distance of each point adds up to minimum this circular radius (with reference to Fig. 5～Fig. 7) on the curve.

Specifically, for example as shown in Figure 5, at the continuous whole periphery of the peripheral part of 1 negative terminal plate that constitutes by steel plate (metallic plate) 7, to by the section of its center when thickness direction cuts off negative terminal plate 7, mean radius of curvature r is provided with the bend 78b that C word shape or bowing are seized on both sides by the arms below 1mm and in the angular range greater than 90 degree.

Intensity with work hardening method increase negative terminal plate 7 can be regarded as in whole regional extent, and the deflection in each tiny area when hypothesis is divided into tiny area to negative terminal plate 7 carries out the big more degree that just increases more of principal value of integral.So, when the radius of curvature of sweep (bend 78b among the present invention) becomes excessive, deflection in the tiny area reduces, thereby be unable to estimate by the intensity increase that work hardening brings, when the radius of curvature of opposite curvature part is too small, local deflection increases, but the cumulative volume that carries out crushed element is little, thereby the intensity increase that work hardening brings is unable to estimate.Just test is gone up, and when radius of curvature was 0.1mm～1.0mm, the intensity of plastic deformation increased big.

And the angle that it is desirable to bend 78b is big more, and the regional volume that distortion takes place increases more, thereby the intensity increase of work hardening is also big.If angle is that the edge of metallic plate 7 becomes the shape of splayed expansion below 90 degree, during the inner pressure of battery abnormal ascending, closure part is leaked easily, is desirable more than 90 degree therefore.But, if the bend 78b angle of negative terminal plate 7 surpasses 180 degree, just be difficult to punch process, increase cost, so angle should be below 180 degree.

Bend 78b and seal body 6 angular range in succession are big more, and it is just good more to prevent that area that liquid oozes out from strengthening.This angle is to spend for suitable with the lower limit 90 greater than the bend 78b angle that above-mentioned negative terminal plate 7 is set.But if surpass 180 degree, just the extruding that makes negative terminal plate 7 and seal body resin with common sealing mode is invalid, and nonsensical.

Here, the so-called angular range that is called bend 78b that is provided with among the present invention, for example as shown in Figure 5, when when having above-mentioned mean radius of curvature r as the circular approximate bend 78b of the hypothesis of radius, referring to this circular central O is benchmark, the angle θ that sweep 7c two ends constitute ₁And, the angular range of the part that contacts with seal body 6 with bend 78b too, when when having above-mentioned mean radius of curvature r as the circular approximate bend 78b of the hypothesis of radius, referring to this circular central O is benchmark, the angle θ that these contact portion two ends of the bend 78b that contacts with seal body 6 constitute ₂

Among the present invention, as above-mentioned negative terminal plate (metallic plate) 7, the electroplating steel plate of the general about 0.4mm of used thickness.In the present invention, this is because hold a concurrent post negative terminal plate as the metallic plate of the support unit of seal body, anticathode terminal board, the electroplating steel plate of favourable above-mentioned this thickness such as general use cost aspect.

In order to make the metallic plate that has as the support unit function of supporting seal body 6, merge the function that has as negative terminal plate, in other words, for the negative terminal plate 7 that metallic plate is constituted has function as support unit, to become the metallic plate 7 center side part (below, be called terminal surface) of negative terminal face, as common negative terminal plate, laterally direction becomes convex from the inboard, the whole plate-like that forms.Therefore, the metallic plate 7 of holding a concurrent post negative terminal plate being shaped as a whole is discoid, but its peripheral part is provided with the bend 78b that the thickness direction section shape is C word shape or arcuation, the mean radius of curvature r of this bend 78b is below the 1mm, makes exactly at this bend 78b to spread all over the formation that seal body 6 contacts with above-mentioned angular range.

" the 3rd invention "

In order to solve above-mentioned problem 1 and problem 4, the inventor painstakingly discusses, in using the alkaline dry battery of negative terminal plate as the support unit of resin system seal body, height or the raising or the reduction of the negative terminal plate before and after sealing manage to make it to become a side condition.Its result does not make the par of flange surface parallel for terminal surface as can be seen, if having inclination, just can control negative terminal plate becomes any shape.Be exactly, flange surface is had inclination, make the angle of the par of flange surface and terminal surface side increase, the negative terminal plate height after sealing necessarily improves than original height, if reverse inclination then the height of terminal board necessarily reduce.

Specifically, for example as depicted in figs. 1 and 2, encapsulating shell 1 inside that the round-ended cylinder shape is being arranged, accommodate the dividing plate 3 and the electrolyte (figure does not show) of positive pole 2 and negative pole 4, configuration therebetween, and resin system seal body 6 is installed and in the open end 1a of encapsulating shell 1 from its support unit of interior Zhou Zhicheng 7, employing is clamped in the alkaline dry battery that the way of resin system seal body 6 seals by 7 of encapsulating shell 1 and support units, and the present invention is constructed as follows.That is,, use example negative terminal plate 7 (adopting the label identical) as shown in Figure 3 and Figure 4 with support unit as above-mentioned support unit 7.This negative terminal plate 7 have middle body form the terminal surface 77 of convex, from vertically running through the direction of this terminal surface 77, by the flange surface 78 that surrounds the peripheral part that terminal surface 77 forms.And, interior Monday of flange surface 78 side par (flange surface par) 78a is set, this flange surface par 78a and terminal surface 77 become uneven structure.At this moment, regulation terminal surface 77 is more than 4 degree with the angle α of flange surface par 78a, and it is desirable to especially is 4～20 degree.If this is because the angle of cut α of terminal surface 77 and flange surface par 78a spends greater than 4, then seal the height raising aspect unanimity of back negative terminal plate 7, if but this angle of cut α surpasses 20 degree, it is big that the height of negative terminal plate 7 becomes, the cause that design freedom has reduced.

In addition, so-called flange surface par 78a in this specification not necessarily only is defined in the infinitely-great plane of curvature, and also it doesn't matter to have the slowly flexure plane of larger radius of curvature.At this moment, the inclination of so-called flange surface par 78a is meant the plane that connects two points of inflection being positioned at the flexure plane two ends and the angle of cut α (with reference to Fig. 4) of terminal surface 77.

" the 4th invention "

Use negative terminal plate to be used as in the alkaline dry battery of support unit of resin system seal body, when its horizontal clamping is sealed, thin-walled portion by the explosion-proof usefulness of the resin system of being located at seal body is born, be because in the existing seal body, the wall thickness of coupling part is just comparatively the same except that the thin-walled portion of explosion-proof usefulness, become the structure that bears the stress that acts on connecting portion by whole this connecting portion, can think on the result owing to become the cause of structure that stress concentrates on the thin-walled portion of explosion-proof usefulness.

Therefore, among the present invention, in order to solve above-mentioned problem 1 and problem 5, use negative terminal plate to be used as in the alkaline dry battery of support unit of resin system seal body, employing is provided with the way of stress absorption portion of the relative thin wall shape of a part of stress when absorbing horizontal clamping and sealing at the connecting portion of seal body, prevents that stress from concentrating to the thin-walled portion of explosion-proof usefulness.Specifically, encapsulating shell 1 inside that the present invention is having the round-ended cylinder shape as shown in Figure 1, accommodate the dividing plate 3 and the electrolyte (figure does not show) of positive pole 2 and negative pole 4, configuration therebetween, and resin system seal body 6 is installed and in the open end 1a of encapsulating shell 1 from its support unit of interior Zhou Zhicheng, by with clamping resin system seal body 6 between encapsulating shell 1 and support unit in the alkaline dry battery that the open end 1a that makes encapsulating shell 1 seals, form following formation.

That is,, shown in Fig. 2 amplifies,, use 1 metallic plate 7 (negative terminal plate 7) of holding a concurrent post negative terminal plate as above-mentioned support unit at first in order to seek the increase of discharge capacity.Then, relevant resin system seal body 6 makes and possesses: keep inserting the lug boss 61 of the negative pole current collecting bar 5 of negative pole 4 central parts, with above-mentioned negative terminal plate (support unit 7) from the interior Zhou Zhicheng formation of the connecting portion 63 of peripheral part 62, connection bump portion 61 and the peripheral part 62 of the inner peripheral surface of encapsulating shell 1 in succession also.The connecting portion 63 of this resin system seal body 6 is provided with the thinner wall section 63a of explosion-proof usefulness in the root portion that is positioned at above-mentioned lug boss 61 1 sides.And, in order to alleviate the burden of the thinner wall section 63a that clamps the explosion-proof usefulness when sealing, root portion in above-mentioned peripheral part 62 1 sides of connecting portion 63 is provided with the stress absorption portion 63c of absorption in a part of stress of this connecting portion 63, make the open end 1a of encapsulating shell 1 must be sealed and during the resin system of clamping seal body 6 stress can not focus on the thinner wall section 63a of above-mentioned explosion-proof usefulness.The part 63d of all sides relatively will form and make the thick discontinuous attenuation of an ancient piece of jade, round, flat and with a hole in its centre and and to have shoulder height between the part 63d of all sides in above-mentioned poor in this 63c of stress absorption portion and its were very near.

" the 5th invention "

When causing high temperature because of short circuit heating etc. or the safety valve of overdischarge resin system seal body when placing move undesired, can think because before the safety valve action, be exactly before the thin-walled portion of the explosion-proof usefulness of connecting portion is broken, the connecting portion of seal body expands dome, the cause of contacting metal packing ring or negative terminal plate (when not establishing metal washer) under this state.Promptly, originally with before metal washer or negative terminal plate contact, the explosion-proof of connecting portion of seal body must be broken with thin-walled portion, and wait owing to the connecting portion wall thickness of seal body is relatively thinner on the whole in shape or constructional reason, make the dome-shaped distortion of connecting portion, before thin-walled portion is broken generation, become dome-type connecting portion and just broken.

Therefore, among the present invention, in order to solve above-mentioned problem 1 and problem 6, be used as in the alkaline dry battery of support unit of resin system seal body using negative terminal plate, adopt the way of the shape of change resin system seal body, make the safety valve regular event, when improving short circuit high temperature or the fail safe of overdischarge when placing.Specifically, the present invention as shown in Figure 1, encapsulating shell 1 inside that the round-ended cylinder shape is being arranged, accommodate the dividing plate 3 and the electrolyte (figure does not show) of positive pole 2 and negative pole 4, configuration therebetween, and resin system seal body 6 is installed and in the open end 1a of encapsulating shell 1 from its support unit of interior Zhou Zhicheng, by clamping resin system seal body 6 in the alkaline dry battery that the open end 1a that makes encapsulating shell 1 seals, form following formation with encapsulating shell 1 and support unit.

Be exactly, shown in Fig. 2 amplifies,, to use 1 metallic plate 7 (negative terminal plate 7) of holding a concurrent post negative terminal plate as above-mentioned support unit at first in order to seek the increase of discharge capacity.Then, relevant resin system seal body 6 makes and possesses: keep inserting the lug boss 61 of the negative pole current collecting bar 5 of negative pole 4 central parts, with above-mentioned negative terminal plate (support unit) 7 from the interior Zhou Zhicheng formation of the connecting portion 63 of peripheral part 62, connection bump portion 61 and the peripheral part 62 of the inner peripheral surface of encapsulating shell 1 in succession also.The connecting portion 63 of this resin system seal body 6 is provided with the thinner wall section 63a of explosion-proof usefulness in the root portion of above-mentioned lug boss 61 1 sides.The part 63b in this thinner wall section 63a and the very near outside that surrounds it relatively will form and make the discontinuous attenuation of wall thickness, and and the part 63b in the above-mentioned outside between to have shoulder height poor.

" the 6th invention "

The 6th invention by to the above-mentioned the 4th and the 5th liang of invention combination, further improves the reliability of safety valve.Be exactly, in alkaline dry battery with the resin system seal body 6 that possesses above-mentioned such lug boss 61, peripheral part 62 and connecting portion 63, the root portion that it is characterized in that above-mentioned lug boss 61 1 sides in the connecting portion 63 of resin system seal body 6, be provided with form with the 1st heavy section 63b comparison discontinuous attenuation of wall thickness in the very near outside of its encirclement and and the 1st heavy section 63b between have the explosion-proof usefulness of shoulder height difference thinner wall section 63a; The root portion of above-mentioned peripheral part 62 1 sides in connecting portion 63, the stress absorption portion 63c of absorption in a part of stress of this connecting portion 63 is set, makes and the open end 1a of encapsulating shell 1 must be sealed and stress does not focus on explosion-proof usefulness during the resin system of clamping seal body 6 thinner wall section 63a; Form the 63c of this stress absorption portion, make itself and the 2nd heavy section 63d comparison that is positioned at its very near all side, the discontinuous attenuation of wall thickness and and the 2nd heavy section 63d between to have shoulder height poor.

At this moment, the wall thickness of the 1st heavy section 63b is set at 0.4～0.5mm, and 2.5～3.0 times the wall thickness that the wall thickness of the 2nd heavy section 63d is set at the 1st heavy section 63b wall thickness is desirable.Using negative terminal plate 7 to be used as in No. three alkaline dry batteries of list of support unit of resin system seal body 6, the deflection (addendum modification) that the connecting portion 63 of seal body 6 touches till the negative terminal plate 7 is 1.2mm.At resin system seal body (for example 6, the seal body that 6 nylon are made) 6, as described above each wall thickness of the 1st heavy section 63b and the 2nd heavy section 63d is set at thicker the time, can be under the condition of 150～200 ℃ of temperature, the deflection that makes connecting portion 63 is below the 1.2mm, and the internal stress of connecting portion 63 is below the 100mmNs (existing structure about 60%).Therefore, can prevent seal body 6 dome-shaped expansions and contact before the thinner wall section 63a of (150～200 ℃) explosion-proof usefulness breaks during high temperature, or the situation that seal body 6 breaks during the overdischarge placement with negative terminal plate 7.

Description of drawings

Fig. 1 is the profile that alkaline dry battery unitary construction of the present invention is used in expression.

Fig. 2 is the part enlarged drawing of No. three alkaline dry battery closure part of list of expression enlarged drawing 1.

Fig. 3 is the plane graph of used negative terminal plate (metallic plate) example of expression the present invention.

Fig. 4 is the sectional arrangement drawing of the negative terminal plate profile construction of presentation graphs 3.

Fig. 5 is another illustration of expression negative terminal plate, is the profile that its peripheral part structure was omitted and simplified to an expression part.

Fig. 6 is the another illustration of expression negative terminal plate, is the profile that its peripheral part structure was omitted and simplified to an expression part.

Fig. 7 is an illustration again of expression negative terminal plate, is the profile that its peripheral part structure was omitted and simplified to an expression part.

Fig. 8 is the profile that expression is omitted the peripheral part structure part of comparative example 3 used metallic plates of the present invention and simplify.

Fig. 9 is the profile that expression is omitted the peripheral part structure part of comparative example 4 used metallic plates and simplify.

Figure 10 is the profile that expression is omitted the peripheral part structure part of comparative example 6 used metallic plates of the present invention and simplify.

Figure 11 is that expression is in order to illustrate the sectional arrangement drawing of the used negative terminal plate of generation problem in the sealing process.

Figure 12 is the sectional arrangement drawing of used resin system seal body structure in the expression embodiment of the invention 10.

Figure 13 is the sectional arrangement drawing of used resin system seal body structure in the expression comparative example 9.

Figure 14 is the key diagram that carries out experimental condition in the notebook inventive embodiments 10.

Figure 15 is the profile of the generality structure of the existing alkaline dry battery of expression (single No. three alkaline dry batteries).

Figure 16 is the part enlarged drawing that amplifies the closure part of expression Figure 15 alkaline dry battery.

Figure 17 is that the existing alkaline dry battery of expression (the single No. three) connecting portion of seal body has stopped up the condition mode figure of metallic plate (metal washer) exhaust body opening.

Embodiment

Fig. 1 is the illustration that expression the present invention is applied to single No. three alkaline dry batteries (below, be also referred to as single alkaline dry battery or battery).This alkaline dry battery has: hold a concurrent post positive terminal the encapsulating shell that the round-ended cylinder shape is arranged 1, be contained in the dividing plate 3 that constitutes by the cup-shaped nonwoven fabrics in cylindraceous anodal 2, the hollow bulb that is disposed at this positive pole 2 of (in the element cell C) in this encapsulating shell 1, be filled into pasty state negative pole 4 in this dividing plate 3, insert spike negative pole current collecting bar (negative electrode collector) 5 in this negative pole 4, be the electrolyte (scheming not shown) of main component to soak the potassium hydroxide aqueous solution that is contained in dividing plate 3 and anodal 2, be the formation that the open end 1a side of encapsulating shell 1 is sealed.The positive terminal part 1b of convex is formed on the bottom of encapsulating shell 1.Here, the symbol A among Fig. 1 represents the closure part of encapsulating shell 1, and symbol B represents the shell portion of encapsulating shell 1.Further point says that under state shown in Figure 1, the closure part A of so-called encapsulating shell 1 is meant that the part that the distortion that is caused by groove makes the profile of encapsulating shell 1 dwindle than original size plays top part in detail, and shell portion B is meant following thus part.

And for using above-mentioned alkaline dry battery of the present invention, the shell of the shell portion B of encapsulating shell thick (wall thickness) is below the 0.18mm, and the thick shell that is set at shell portion B of the shell of hermetic unit A thick more than 1.4 times.

What accommodate in the encapsulating shell 1 cylindric anodal 2 is to be made of the mixture of manganese dioxide and graphite (electric conducting material).In the above-mentioned alkaline dry battery, when mixing this manganese dioxide and graphite (electric conducting material) formation anodal 2, use the electrolyte that has improved concentration of potassium hydroxide.This is because of the electrolyte shaping positive pole 2 that has improved concentration of potassium hydroxide by use, can improve and become anodal 2 formed body intensity.Its result does not just need to use for the adhesive (bond resin) in conjunction with manganese dioxide and graphite (electric conducting material), can improve the filling rate of the material relevant with this partial discharge characteristic, thereby becomes and improve the battery discharge characteristic.And,,, also be difficult to deformed by external force even if encapsulating shell 1 uses when resembling the sheet metal of wall thickness as described above owing to improve positive pole 2 intensity of accommodating in the encapsulating shell 1.

In the open end 1a of encapsulating shell 1, be in the closure part A, be equipped with: by relief valve mechanism with explosion-proof usefulness, for example the seal body 6 that constitutes of resin such as polyamide or polypropylene (6,6 nylon in the illustrated example), from its support unit of interior Zhou Zhicheng and hold a concurrent post 1 metallic plate 7 (negative terminal plate 7) of negative terminal plate and lack the insulation board 8 that the tubular resin constitutes by the flanged pin of electric insulation between the open end 1a that makes encapsulating shell 1 and the negative terminal plate 7.

Shown in amplifying among Fig. 2, seal body 6 be by the lug boss 61 with the hole 61a that inserts collector plate 5, in succession the inner peripheral surface of encapsulating shell 1 peripheral part 62, and connection bump portion 61 and peripheral part 62 and the connecting portion 63 that blocks from the former to the latter constitute.And by means of this seal body 6, the element cell C of cell active materials is accommodated in sealing, prevents that the electrolyte in the element cell C from spilling to the outside, and made negative terminal plate 7 between encapsulating shell 1 with above-mentioned insulation board 8 electric insulations.

In the root portion of lug boss 61 1 sides of the connecting portion 63 of seal body 6, the thin-walled portion 63a of the relief valve mechanism that constitutes explosion-proof usefulness is set.This thin-walled portion 63a, inner pressure of battery rise to regulation pressure when above connecting portion 63 in figure above side distortion, in press when further rising because this thin-walled portion 63a breaks, play by negative terminal plate 7 exhaust body openings described later, outside element cell C, discharge the function of pressure in the part.; in existing seal body; wall thickness between the very near Outboard Sections of the thinner wall section of explosion-proof usefulness and its is also little; but the wall ratio of connecting portion approaches and is the same; therefore can not conclude, or during short circuit high temperature before thin-walled portion is broken, dome-shaped expansion contacts negative terminal plate as before and has stopped up steam vent; or overdischarge cutting off before the thin-walled portion when placing, and the possibility that the connecting portion of dome-shaped expansion is broken does not have fully.Therefore, in order to accomplish not take place this problem, to the seal body 6 that is equipped with in the alkaline dry battery of the present invention, form the thinner wall section 63a of the explosion-proof usefulness that is arranged at connecting portion 63 like this, make its with part (the 1st heavy section) 63b in the very near outside that surrounds this part relatively, have the discontinuous attenuation of wall thickness and and the 1st heavy section 63b between to have the shoulder height of regulation poor.

Root portion in peripheral part 62 1 sides of the connecting portion 63 of seal body 6 is provided with the comparatively 63c of stress absorption portion of thin-walled.Form the 63c of this stress absorption portion like this, make itself and part (the 2nd heavy section) the 63d comparison that is positioned at this very near all side, the discontinuous attenuation of wall thickness and and the 2nd heavy section 63d between to have shoulder height poor.Therefore, seal the open end 1a of encapsulating shell 1 and during fastening seal body 6, absorption is in a part of stress of connecting portion 63, prevents that stress from concentrating to the thinner wall section 63a of explosion-proof usefulness.

Formation is from the part of the 1st heavy section 63b to the 2 heavy section 63d of the connecting portion 63 of seal body 6, so that along with from the 1st heavy section 63b to the 2 heavy section 63d wall thickness thickening continuously.In the seal body 6 of illustrated example, the wall thickness of the 1st heavy section 63b is 0.4～0.5mm, and the wall thickness of the 2nd heavy section 63d is made as 2.5～3.0 times of the 1st heavy section 63b wall thickness.And, along with such connecting portion 63 shapes, and the wall thickening of connecting portion 63 during existing shape comparison, and the 1st heavy section 63b between have the explosion-proof usefulness of regulation shoulder height difference the structure of thinner wall section 63a, in the time of just further can preventing above-mentioned high temperature short circuit really or overdischarge improper when placing.

In the lug boss 61 of seal body 6, the upper part of Fig. 2 mesopore 61a of interspersed negative pole current collecting bar 5, be formed with large diameter hole part 61b greater than the large diameter of all the other bore portion internal diameters, under the shown position of interting after negative pole current collecting bar 5 is installed, the large-diameter end 5a of negative pole current collecting bar 5 is entrenched among the large diameter hole part 61b of lug boss 61, the upper end of this large-diameter end 5a become slightly outstanding lug boss 61 upper surfaces state or with its roughly isoplanar state.Among Fig. 2, the inner peripheral portion of the inner peripheral portion of lug boss 61 and peripheral part 62 has relatively been thickeied wall thickness, yet this be because to sealing time riveted joint peripheral part 62 crushed element, lug boss 61 is in the back side one side of negative terminal plate 7 middle bodies with the negative pole current collecting bar 5 that interts therein, and this part also has from the effect of rear support negative terminal plate 7 does not cave in it to the inside because of external force.

On the other hand, negative terminal plate 7 is to be made of 1 steel plate, use shown in the monomer as Fig. 3 and Fig. 4, be the central portion terminal surface 77 that forms by convex, from vertically running through this terminal surface 77 directions, form the peripheral part flange surface 78 that surrounds terminal surface 77, and from terminal surface 77 outside cylindric terminal surface sides 79 formations in week in the thoughtful flange surface 78.Again on terminal surface 77 around its central part, form slightly depression and overlook rounded groove 77a, the back side one side round the middle body of this groove 77a adopts dot welding method etc., the large-diameter end 5a (with reference to Fig. 2) of welding negative pole current collecting bar 5.

In the flange surface 78 of negative terminal plate 7 comprises the par 78a of all sides and riveted joint during seal body 6 from its peripheral part 62 of interior all firm support to be the bend 78b that purpose spreads all over the outer circumferential side that the whole periphery of negative terminal plate 7 is provided with.In the par 78a of all sides, at thickness direction section shown in Figure 4, relatively have relatively smooth shape with the bend 78b of outer circumferential side.And this par 78a becomes the structure of 4 degree to tilt to terminal surface 77a owing to form with outside direction down, and the short transverse dimensional discrepancy that negative terminal plate 7 distortion cause in the sealing process is reduced.In addition, illustrated example is just stipulated the angle of cut α of flange surface par 78a and terminal surface 77, and the point of inflection that promptly connects the outer circumference end (bend 78b side) that is positioned at flange surface par 78a is 8 degree with the plane of the point of inflection that is positioned at Zhou Duan (terminal surface side one side, 79 sides) and the angle of cut α of terminal surface 77.

The bend 78b that negative terminal plate 7 outer circumferential sides are provided with, described in the scheme of problem " solve " of front one, passing through the section of its center when thickness direction cuts off negative terminal plate 7, mean radius of curvature is below the 1mm, and be bent to form roughly C word shape or arcuation greater than 90 angular ranges of spending, and the meaning of having said is that its outer circumferential side is in the interior all side contacts that spread all over greater than the peripheral part 62 of 90 angular ranges of spending and seal body 6.And, in this contact portion, the peripheral part 62 of seal body 6, clamp by riveted joint with the bend 78b of the negative terminal plate 7 that is positioned at its all side and the open end 1a of the encapsulating shell 1 that is positioned at outer circumferential side, as shown in Figure 2 with assigned position in the open end 1a of seal body 6 installation encapsulating shells 1, under this state, above in the element cell C, seal the structure of the requisite space that between the connecting portion 63 of seal body 6 and negative terminal plate 7, just is formed for simultaneously guaranteeing that safety valve (thin-walled portion 63a) moves.In addition, when the symbol 7f among Fig. 3 and Fig. 4 represents the safety valve action, make the steam vent of the gas of generation in the element cell to outside escape usefulness.

In addition, what is called is provided with the angular range of above-mentioned bend 78b, as representing to put down in writing among negative terminal plate 7 another routine Fig. 5, when when having above-mentioned mean radius of curvature r as the circular approximate bend 78b of the hypothesis of radius, mean with this circular central O as benchmark the angle θ that the two ends of bend 78b constitute ₁The angular range of bend 78b and seal body 6 contact portions too, when when having above-mentioned mean radius of curvature r as the circular approximate bend 78b of the hypothesis of radius, mean with this circular central O as benchmark the angle θ that these contact portion two ends of the bend 78b that contacts with seal body 6 constitute ₂

On the other hand, the insulation board 8 that constitutes by the resinite of the short tubular of flanged pin, after seal body 6 is installed, the terminal surface 77 by the short tube part 8a of this insulation board 8 being embedded negative terminal plate 7 and the openend of encapsulating shell 1 and and peripheral part 62 1 ends of seal body 6 between the gap portion that forms, be assembled to illustrated assigned position, therefore make electric insulation between negative terminal plate 7 and the encapsulating shell 1.

In addition, negative terminal plate (metallic plate) is as long as the bend 78b of 7 outer circumferential side settings satisfies foregoing mean radius of curvature r and angular range, theta ₁, θ ₂Condition, just no matter its bending method or bending direction.Fig. 5 is other example figure of expression bend 78b to Fig. 7.Fig. 5 wherein represents to form the example of bend 78b, make its with the terminal surface 7a equidirectional of negative terminal plate 7 or mutually the same side become protruding.Fig. 6 represents to form the example of bend 78b, makes its foreign side to negative terminal plate 7 radial directions become protruding.Fig. 7 represents to form the example of bend 78b, make its with the direction of the opposite side of projected direction of terminal surface 77, the peripheral part of first order buckling negative terminal plate 7, thus further back-flexing make outer circumferential side and seal body 6 peripheral part 62 under the state of stipulating in succession.And, even can not do flat simply when pushing away terminal surface 77 by force during because of the degeneration of battery for example or from the outside yet, or can not make the purpose of negative terminal plate 7 whole distortion during seal body 6 riveted joint, and also can be on negative terminal plate 7, same concavo-convex of concentric circles setting and the groove 77a that is located at central portion.

[effect]

In alkaline dry battery, as support unit from interior Zhou Zhicheng resin system seal body, abolish previously used metal washer, replace and use as Fig. 1 to negative terminal plate (metallic plate) 7 shown in Figure 5, the peripheral part of seal body 6 seized on both sides by the arms between this negative terminal plate 7 and encapsulating shell 1 rivet, according to two following aspect reasons, can make the reduced thickness of closure part.

First aspect owing to abolish metal washer, can make the closure part thickness of attenuate metal washer at least.Of home make, adopt No. three alkaline dry batteries of list of the way of metal washer extruding sealing body to do example, use more than the 0.6mm metal washer of the about 0.75mm of thickness, by abolishing this metal washer, at least can attenuate at the thickness of the closure part of this thickness part.

Second aspect can be enumerated, the space of compressive strain in the connecting portion 63 that does not need to be provided with especially seal body 6 is subjected to.To be described in further detail this.

Usually, seal body 6 usefulness nylon or polypropylene etc. are made, and have said that its part was provided with the thinner wall section of explosion-proof usefulness.When no matter what reason inner pressure of battery raises, for example appearance distortion of seal body 6 as shown in figure 16 shown in this figure chain-dotted line when interior pressure further raises, pressed the rising of pressing in preventing because the thin-walled portion 63a of connecting portion 63 tears to discharge in the part.In Figure 16 and the existing alkaline dry battery shown in Figure 17, be provided with gap (space S between the thin-walled portion 63a of seal body 6 and the metal washer 107 ₁), and if press in little when not high in this gap, the connecting portion 63 of the seal body 6 after the distortion or thin-walled portion 63a are suppressed by metal washer 107 and can not be out of shape, no matter interior voltage rise height can not be torn thin-walled portion 63a, thereby can not discharge interior pressure.For this reason, the interval of certain limit need be set between the metal washer 107 of thin-walled portion (operating point of the safety valve) 63a of seal body 6 and supporting seal body 6, be example with No. three alkaline dry batteries of of home make list, the interval of the about 1.0～1.5mm of operated by rotary motion.

Say again, as Figure 15 and shown in Figure 16, it has been that de facto standards is in order to rivet seal body 6 that the negative terminal plate 207 of alkaline dry battery is made convex shape, when adopting metal washer as support unit, as previously described, the wasted space S that generation less needs in fact with regard to battery between metal washer 107 and negative terminal plate 207 ₂But, as of the present invention, abolish metal washer, if use resemble Fig. 1 to negative terminal plate (metallic plate) 7 of Fig. 7 shown in for example as support unit, can be former useless space S ₂As the needed space of seal body 6 distortion, therefore the reduced thickness of closure part is got off.

According to above-mentioned reason, arrive shown in Figure 7 as Fig. 1, has only negative terminal plate 7 by making as the metallic plate of the support unit that supports seal body 6 internally, and it (for example is 0.3～0.7mm) that the thickness that makes this negative terminal plate reduces to also thinner than former metal washer thickness, can reduce the volume of closure part, therefore, just can increase the internal volume (volume of element cell C) of battery.Example shown in Fig. 1, Fig. 2 is said, closure part A is with respect to the thickness (thickness of cell height direction) that cell height is occupied more than 10% in the structure of Fig. 1, correspondingly in the structure of Fig. 2, the thickness of closure part is suppressed to 8% of cell height, its result, the battery internal volume increases by 4%.If cell active materials is filled in this increase volume, battery capacity just increases by 4%, even stay the space as before, and the also absorption plant function that rises of the mitigation pressure because of as inside battery generation gas the time, and on safety, effectively utilize.

In addition, in this alkaline dry battery, because terminal surface 77 in negative terminal plate 7 and flange surface par 78 are provided with the inclination more than 4 degree, negative terminal plate 7 distortion after sealing are also all than original height height.Therefore, can eliminate the problem that 7 distortion of negative terminal plate in the sealing process make dimensional discrepancy.

But, abolish metal washer, replace that only to use also be the metallic plate of negative terminal plate, when the variations in temperature that on battery, is added with fierceness etc., still have inner highly basic electric insulation via the danger that spills between encapsulating shell and the seal body.Because as the metallic plate attenuation that pushes the support unit of seal body from the inboard, negative terminal plate can be out of shape during riveted joint, be because seal body is added the inadequate cause of extruding force.

This distortion has only as negative terminal plate 7 of the present invention, at its peripheral part the bend 78b that mean radius of curvature has below the 1mm C word shape roughly or arcuation section shape is set, makes this bend 78b contact just and can prevent with seal body 6 at the angular range that spreads all over regulation.This is because not only make negative terminal plate 7 be difficult to distortion by the work hardening of following this bend 78b to form, and be added to the peripheral part that extruding force on the seal body 6 also acts on negative terminal plate 7 by encapsulating shell 1, by the bend 78b that contacts than the angular range of broad with seal body 6, on whole negative terminal plate, firmly support the cause of seal body 6.Thereby, the peripheral part of open end 1a that can crooked to the inside encapsulating shell 1, and negative terminal plate 7 between with the powerful seal body 6 that clamps, consequently, can improve the adaptation between encapsulating shell 1 and the seal body 6, i.e. leakproof (the close property of liquid).And, because under the state of riveted joint seal body 6, the bend 78b of negative terminal plate 7 is contacting greater than an angle of 90 degrees degree scope with seal body 6, seal body 6 is also bigger with the contact area of encapsulating shell 1, therefore can provide enough leakproofs to the boundary member of seal body 6 and encapsulating shell 1.

In addition, in the alkaline dry battery of the present invention, as described below, the shape by transforming resin system seal body 6 is so that construct, the safety valve action that the thinner wall section 63a of the explosion-proof usefulness of the connecting portion 63 of being located at seal body 6 is constituted, and can improve its reliability or fail safe.

At first, band root portion in peripheral part 62 sides of the connecting portion 63 of seal body 6 is provided with the 63c of stress absorption portion, by absorbing a part of stress that acts on connecting portion 63 when horizontal clamping is sealed, can prevent that the thinner wall section 63a that stress clamps the explosion-proof usefulness when sealing sidelong from concentrating by the 63c of this stress absorption portion.Therefore, can control the means for operation pressure of safety valve change, just can improve the reliability of this part safety valve.

Secondly, root portion in lug boss 61 sides of the connecting portion 63 of seal body 6, the thinner wall section 63a of the explosion-proof usefulness by formation is set, itself and part (the 1st heavy section) 63b that surrounds its very near outside are compared, the discontinuous attenuation of wall thickness and and above-mentioned the 1st heavy section 63b between to have shoulder height poor, when short circuit high temperature or overdischarge just can cut off this thin-walled portion 63a really when placing, promptly, heating causes when connecting portion 63 distortion take place in the rising softening and inner pressure of battery of seal body resin during with short circuit, concentrate on the thinner wall section 63a of explosion-proof usefulness by stress, take place with before negative terminal plate 7 contacts in dome-shaped distortion because of connecting portion 63, allow thin-walled portion 63a cut off to destroy and discharge in press.And, though the softening of the seal body resin that causes because of heating do not take place in overdischarge when placing, but because of in press to rise and make stress in connecting portion 63, at this moment also because stress is concentrated to above-mentioned thin-walled portion 63a, before connecting portion 63 breaks generation, allow thin-walled portion 63a cut off and destroy and the interior pressure of release.Like this, during short circuit high temperature or overdischarge when placing by the safety valve regular event, press in the connecting portion 63 of seal body 6 not being broken just discharge, can prevent to disperse or break the sound because of content that breaking of connecting portion 63 taken place.

Particularly, formation is from the part of the 1st heavy section 63b to the 2 heavy section 63d of the connecting portion 63 of seal body 6, so that along with proceeding to the latter from the former, make wall thickness thickening continuously, wall thickness at the 1st heavy section 63b is set at 0.4～0.5mm, the wall thickness of the 2nd heavy section 63d is set under 2.5～3.0 times the situation of the 1st heavy section 63b wall thickness, along with the heavy wall shape of this connecting portion 63 and and the 1st heavy section 63b between have the explosion-proof usefulness of regulation shoulder height difference the structure of thinner wall section 63a, in the time of can preventing short circuit high temperature really or the seal body 6 of overdischarge when placing break.

Below, embodiments of the invention are described, the present invention is defined in these embodiment certainly.In addition, said below " % " particularly not otherwise the whole finger " percentage by weight (wt%) " of explanation in advance.

" embodiment 1～4 "

The quiet steel plate of the Mo of thickness of slab 0.25mm is adopted deep drawing processing, form the encapsulating shell of single No. three alkaline dry batteries.At this moment, the steel plate thickness that the thick reservation of the shell of closure part is original is processed into the thickness of shell portion thinner than original steel plate.In the table 1, these parts of the shell portion of the merging expression embodiment of the invention 1～4 used encapsulating shell and the used encapsulating shell of shell comparative example thick and described later of closure part.

And in embodiment 1～4, the depression of positive terminal when preventing that battery from falling also is processed into the positive terminal part 1b of encapsulating shell than shell portion shell is thick and will thickeies.

Secondly, the positive electrode 11.0g that mixes manganese dioxide, graphite and the water of electrolysis acquisition in 92: 5: 3 ratio (weight ratio), press molding becomes the cylindric positive pole of internal diameter 9.1mm, external diameter 13.3mm, high 43.0mm, and this positive pole is inserted in the encapsulating shell that single No. three alkaline dry batteries use.Then, the openend from encapsulating shell applies rill in short transverse 3.7mm position.This is to support seal body in the rill position when later on inserting seal body, makes it can not be extruded into the inside, rill position and goes.And then, in the inboard of encapsulating shell, from the part of openend up to short transverse 3.7mm, with and encapsulating shell and seal body between adhesiveness well as purpose, the coating pitch.In addition, pitch coating weight leakproof when 20mg is following reduces, and more than the amount, can confirm as leakproof does not have difference as if it.

Secondly, the dividing plate that the spin laced fabric that will be made up of vinylon and the artificial silk of thickness 100 μ m, three plies are rolled into cup-shaped is loaded into the inboard of previous cylindric positive pole, makes its potassium hydroxide aqueous solution 1.5g that floods concentration 39% as electrolyte.Then, purity 99.0%, by screen cloth mesh 425 μ m, do not insert dividing plate inside by the powder zinc 4.0g of screen cloth mesh 75 μ m and the potassium hydroxide aqueous solution 2.0g of concentration 38% and the pasty state negative pole that Sodium Polyacrylate 0.04g stirs into.

Then, the negative pole collector plate that is used to extract the tin-plated brass manufacturing of negative pole current collection interts the lug boss that is installed on seal body, with dot welding method welding negative pole current collecting bar and negative terminal plate.This negative terminal plate is installed in the seal body that nylon 6,6 (6,6 nylon) makes, to have attached it to previous filling anodal and the encapsulating shell of negative pole after, from the openend outside of encapsulating shell, by the riveted joint way, make No. three alkaline dry batteries of list with the spinning mode.

" comparative example 1 and comparative example 2 "

Except that the shell of the closure part of setting encapsulating shell as shown in table 1 and shell portion is thick, all make single No. three alkaline dry batteries with embodiment 1～4 is same.

[leakproof test]

Among each embodiment that makes as described above and the battery of comparative example, respectively get 100, in the thermostat of-10 ℃ and 60 ℃ variations in temperature of repetition in per 30 minutes, preserve 3 day time, after the preservation, with the cresol red solution of alkalescence identification liquid, inspection can be from oozing out inner aqueous alkali (electrolyte) between encapsulating shell and the seal body.Its result of table 1 expression.

[table 1]

	The shell of shell portion thick (mm)	The shell of closure part thick (mm)	Mouth-sealed portion is thick/and barrel is thick	The leakage that variations in temperature causes
					Embodiment 1	0.18	0.25	1.40	Do not have
Embodiment 2	0.16	0.25	1.56	Do not have
					Embodiment 3	0.16	0.225	141	Do not have
Embodiment 4	0.15	0.21	140	Do not have
					Comparative example 1	0.18	0.225	1.25	Take place 15 in 100
Comparative example 2	0.16	0.21	1.31	Take place 17 in 100

By this table as can be known, the alkaline dry battery of the embodiment of the invention 1～4 gained is under the environment of variations in temperature fierceness, even after during preserving necessarily, do not recognize any leakage fully.Opposite in this, the alkaline dry battery of comparative example 1 gained have 15 to recognize liquid body exudate in 100 samples, and the alkaline dry battery of comparative example 2 has 17 to recognize liquid body exudate in 100 samples.

" embodiment 5 "

The positive electrode 11.0g that mixes manganese dioxide, graphite and the water of electrolysis acquisition in 92: 5: 3 ratio (weight ratio), be processed into the positive pole cylindraceous that forms internal diameter 9.1mm, external diameter 13.3mm, high 43.0mm, this positive pole is inserted in the encapsulating shell that single No. three alkaline dry batteries use.Then, the openend from encapsulating shell applies rill in short transverse 3.7mm position.This is to support seal body in the rill position when later on inserting seal body, makes it can not be squeezed into the inside, rill position and goes.And then, in the inboard of encapsulating shell,, well as purpose, be coated with pitch with adhesiveness between encapsulating shell and the seal body from the part of openend up to short transverse 3.7mm.

Secondly, the dividing plate that the spin laced fabric that will be made up of vinylon and the artificial silk of thickness 100 μ m, three plies are rolled into cup-shaped is loaded into the inboard of previous cylindric positive pole, makes its potassium hydroxide aqueous solution 1.5g that floods concentration 39% as electrolyte.Then, purity 99.0%, by screen cloth mesh 425 μ m, and can not insert dividing plate inside by the powder zinc 4.0g of screen cloth mesh 75 μ m and the potassium hydroxide aqueous solution 2.0g of concentration 39% and the pasty state negative pole that Sodium Polyacrylate 0.04g stirs into.

Then, the negative pole collector plate that is used to extract the tin-plated brass manufacturing of negative pole current collection interts the lug boss that is installed on seal body, with dot welding method welding negative pole current collecting bar and negative terminal plate.Here, used negative terminal plate is the metallic plate 7 that schematically shows style among Fig. 5, and the mean radius of curvature r of its bend 78b is 0.6mm, forms the angular range (θ of sweep 7c ₁) be 150 degree, bend 78b and seal body 6 angle (θ in succession ₂) be 120 degree.These negative terminal plate are made thickness 0.4mm nickel-clad steel plate through die-cut, pressure processing.This negative terminal plate is installed in the seal body of nylon 6,6 (6,6 nylon) manufacturing, to have attached it to previous filling anodal and the encapsulating shell of negative pole after, from the openend outside of encapsulating shell,, make No. three alkaline dry batteries of list as shown in Figure 1 with the way of spinning mode by riveted joint.

In addition, at above embodiment 5 and embodiment described later 6,7 and comparative example 3～6, any negative terminal plate also all adopts electroplating steel plate, and this is because the material that it is a handling ease, corrosion resistance is good, cheap.The alkaline dry battery of domestic sale all uses this electroplating steel plate.And why the thickness of this steel plate is 0.4mm, be since steel plate thickness if more than the 0.5mm, during by the die-cut negative terminal plate of raw sheet, the serious wear of mould, the cost aspect is just unfavorable.

" embodiment 6 "

The mean radius of curvature of the sweep of the peripheral part of metallic plate (negative terminal plate) is made as beyond the 0.8mm, makes No. three alkaline dry batteries of list similarly to Example 5.

" embodiment 7 "

The mean radius of curvature of the sweep of the peripheral part of metallic plate (negative terminal plate) is made as beyond the 1.0mm, makes No. three alkaline dry batteries of list similarly to Example 5.

" comparative example 3 "

As shown in Figure 8, on the peripheral part of metallic plate (negative terminal plate) 7 sweep or flexed portion are not set, seize on both sides by the arms beyond seal body 6 rivets with the smooth peripheral part of metallic plate 7 and encapsulating shell 1, all make single No. three alkaline dry batteries similarly to Example 5.

" comparative example 4 "

As shown in Figure 9, the crooked meanders 20 of 90 degree is set on the peripheral part of metallic plate (negative terminal plate) 7, beyond sweep 20 and encapsulating shell 1 clamping seal body 6, all makes single No. three alkaline dry batteries similarly to Example 5.In addition, the corner angle in sweep 20 outsides at this moment become small curved surface, and this mean curvature of surface radius r is 0.3mm.

" comparative example 5 "

The mean radius of curvature of bend 78b in the peripheral part of metallic plate (negative terminal plate) 7 is made as beyond the 1.4mm, makes No. three alkaline dry batteries of list similarly to Example 5.

" comparative example 6 "

As shown in figure 10,90 foldings of writing music are set on the peripheral part of metallic plate (negative terminal plate) 7 to the inside, and then the distolateral sweep 30 of crooked slightly its periphery laterally, clamp beyond the seal body 6 with this sweep 30 and encapsulating shell 1, all make singly No. three alkaline dry batteries similarly to Example 5.In addition, the mean radius of curvature r that has 32, two flexure planes of the 2nd zig zag plane 31,32 of the 1st flexure plane 31 that forms corner angle and end side of sweep 30 outsides at this moment is respectively 0.3mm and 0.4mm.

[leakproof test]

In the battery of making each embodiment and comparative example as described above, 100 separately, in the thermostat of-10 ℃ and 60 ℃ variations in temperature of repetition in per 30 minutes, preserve 3 day time, after the preservation, with the cresol red solution of alkalescence identification liquid, inspection can come from leaching inner aqueous alkali (electrolyte) between encapsulating shell and the seal body.Its result of expression in the table 2.

[table 2]

The profile of metallic plate

The periphery of metallic plate is provided with the mean radius of curvature (mm) that bend grades

The periphery of metallic plate is provided with the angle (θ that bend grades 1)

Bend grades and seal body resin angle (θ in succession 2)

-10 ℃/60 ℃ thermostats are preserved leakage cell number (100) down

Embodiment 5	Fig. 5	0.6	150	120	0
						Embodiment 6	Fig. 5	0.8	150	120	0
Embodiment 7	Fig. 5	1.0	150	120	0
						Comparative example 3	Fig. 8	No meanders	-	-	100
Comparative example 4	Fig. 9	03	90	90	54
						Comparative example 5	Fig. 5	14	150	120	24
Comparative example 6	Figure 10	0.3 and 0.4	90 and 45	90 and 45	2

By this table as can be known, the alkaline dry battery of the embodiment of the invention 5～7 gained is under the environment of variations in temperature fierceness, even after during preserving necessarily, do not recognize any leakage fully.Opposite in this, the alkaline dry battery of comparative example 3 gained is all recognized liquid body exudate for 100 in 100 samples, even represent the alkaline dry battery of the comparative example 6 of best leakproof, has 2 to recognize the generation leakage among 100 samples.

" embodiment 8 " 200

Mixing the positive electrode that manganese dioxide, graphite and water that electrolysis obtains constitute to scale, press molding becomes the cylindric positive pole of making should positive pole to insert in the encapsulating shell that single No. three alkaline dry batteries use.Then, the openend from encapsulating shell applies rill in short transverse 3.7mm position.This is to support seal body in the rill position when later on inserting seal body, makes it can not be squeezed into the inside, rill position and goes.And then, in the inboard of encapsulating shell,, well as purpose, be coated with pitch with adhesiveness between encapsulating shell and the seal body from the part of openend up to short transverse 3.7mm.Secondly, the dividing plate that is rolled into cup-shaped is loaded into the inboard of previous cylindric positive pole, make its dipping electrolyte after, the negative pole of pasty state is inserted dividing plate inside.

About negative terminal plate, battery as the embodiment of the invention is used, the angle of cut that uses flange surface par and terminal surface respectively is (embodiment 8) of 8 degree and (embodiment 9) of 4 degree, and battery as a comparative example is (comparative example 7) of 2 degree and (comparative example 8) of 0 degree with the angle of cut that uses flange surface par and terminal surface respectively.The angle of cut augment direction of this angle regulation flange surface par and terminal surface is just (with reference to Fig. 4).Negative terminal plate shown in the prior figures 4 is to use among the embodiment 8, and Figure 11 is exactly the negative terminal plate of using in the comparative example 8.Negative terminal plate (metallic plate) 7,307 shown in two width of cloth Fig. 4, Figure 11, mean radius of curvature is 0.6mm and bend 78b, the 378b that is provided with 180 degree on every side, and this is to adopt work hardening to increase the intensity of negative terminal plate, increase the way of riveting portion intensity, as not this bend 78b, 378b, the power of negative terminal plate extruding sealing body resin just weakens, and is that inner highly basic electrolyte becomes the reason that spills the outside easily.

These negative terminal plate are all made by die-cut, pressure processing thickness 0.4mm nickel-clad steel plate.With negative pole current collecting bar and this negative terminal plate spot welding, and be installed to nylon 6,6 (6,6 nylon) in the seal body of Zhi Zaoing, to have attached it to previous filling anodal and the encapsulating shell of negative pole after, outside the openend of encapsulating shell, adopt the way of riveted joint with the spinning mode, according to each embodiment and each comparative example, make No. three alkaline dry batteries of list as shown in Figure 1,100 separately.

In addition, about the embodiment of the invention and comparative example, any negative terminal plate also all adopts electroplating steel plate, and this is because the material that it is a handling ease, corrosion resistance is good, cheap.The alkaline dry battery of domestic sale all uses this electroplating steel plate.And why the thickness of this steel plate is 0.4mm, is that the consumption of steel is big again, and is also unfavorable on the cost because steel plate thickness one is thick, and the wearing and tearing of mould are serious again.

As above, the battery of making to be photographed with transmitted X-rays, negative terminal plate raise and still reduces before and after investigation was sealed, and measured height, obtained the poor of height maximum and minimum value.The results are shown in table 3 li.

[table 3]

	The angle of cut of terminal surface and flange surface par	Negative terminal plate height rising ratio before and after sealing	The negative terminal plate height reduces ratio before and after sealing	Seal the poor of back cell height maximum and minimum value
					Embodiment
8	8 degree	100％	0％	0.03mm

Embodiment 9	4 degree	100％	0％	0.04mm
					Comparative example 7	2 degree	70％	30％	0.47mm
Comparative example 8	0 degree	61％	39％	0.49mm

As shown in table 3, because inclination more than 4 degree is set in terminal surface and flange surface par, the negative terminal plate after sealing is out of shape makes it all than original height height.Consequently, the height tolerance of battery and comparative example relatively can be subjected to especially suppressing.If the angle of cut of terminal surface and flange surface par greater than 4 degree, seal the height of back negative terminal plate raise more consistent, yet when this angle of cut is excessive, the height of negative terminal plate will increase, the degree of freedom of design reduces, thereby 20 is desirable below spending.

" embodiment 10 "

In order to confirm the effect of resin system seal body of the present invention, the resin system seal body that uses in single No. three alkaline dry batteries has been carried out following test.In this test, as embodiment 10, the seal body that employing 6,6 nylon are as shown in figure 12 made is 9 seal bodies that adopt 6,6 nylon shown in Figure 13 to make as a comparative example.The wall thickness dimension unit that puts down in writing among two width of cloth figure all is mm.

1, used analytical equipment in the test:

Use 3DCAD Pro-Engineer and the soft Pro-Mechanica of structural analysis (Japanese パ ラ メ ト リ Star Network テ Network ノ ロ ジ-company makes).

2, implementation condition:

Reference axis adopts the polar coordinates of r (radial direction of seal body), θ (circumferencial direction of seal body), z (direction of principal axis of lug boss).

(1) constraints (with reference to Figure 14)

1. consider to be pressed into the negative terminal rod, make the internal diameter forced displacement 0.05mm of seal body lug boss in the r direction.

Horizontal clamping when 2. considering rotation press closing makes the external diameter forced displacement 0.05mm of seal body in the r direction.

3. be defined as above the seal body lug boss that the z direction is fixed, r direction, θ direction freedom.

4. be defined as with the contact portion surface of negative terminal plate that the z direction is fixed, r direction, θ direction freedom.

(2) loading condiction:

Below seal body, push with 6.5MPa, 7.0MPa, 7.5MPa comprehensively.

(3) temperature conditions:

Under normal temperature (23 ℃) and high temperature (150 ℃), measure respectively.

(4) dimensional parameters:

According to the D portion shoulder height difference size shown in Figure 14 (wall thickness of the 1st wall thickness part), prepare 0.25mm, 0.35mm, 0.45mm respectively, inquiring into any is optimum shape.

3, mensuration and result

Inner pressure of battery rises, displacement and stress distribution before the thin-walled portion of investigation connecting portion has just been broken.Its result can know as follows.

Displacement, stress distribution when (1) considering horizontal clamping of rotation press closing situation

1. displacement:

In which kind of seal body of embodiment 10 and comparative example 9, maximum displacement also occurs in peripheral part one side in the connecting portion.

2. stress:

In the seal body of embodiment 10, in the stress absorption portion of the root portion of the outer circumferential side that is arranged at connecting portion stress takes place and concentrate, and do not observe significant stress distribution at connecting portion.Opposite in this, in the seal body of comparative example 9, there is not remarkable stress to concentrate on the contrary, connecting portion integral body is subjected to stress, observed the connecting portion bulk deformation, and, confirm, the seal body of the comparative example 9 of stress absorption portion is not set, stress concentrates on the thinner wall section of the explosion-proof usefulness that is provided with on the root portion of lug boss side of connecting portion.

(2) press 6.5MPa to make displacement, the stress distribution of time spent under normal temperature (23 ℃)

1. displacement:

In the seal body of embodiment 10, from connecting portion central authorities and then at lug boss side generation maximum displacement 0.24mm, in the seal body of comparative example 9, at the substantial middle generation maximum displacement 0.48mm of connecting portion.

2. stress:

8 maximum stresses of embodiment 10 and comparative example 9 also all occur in the thinner wall section of the explosion-proof usefulness in the connecting portion.In the seal body of comparative example 9, the tendency of the rib root portion that also has stress to be dispersed in to be arranged at above the connecting portion.

(3) press 6.5MPa to make displacement, the stress distribution of time spent under high temperature (150 ℃)

1. displacement:

Same during with normal temperature, in the seal body of embodiment 10, from connecting portion central authorities and then at lug boss side generation maximum displacement 0.91mm, in the seal body of comparative example 9, at the substantial middle generation maximum displacement 1.90mm of connecting portion.

2. stress:

8 maximum stresses of embodiment 10 and comparative example 9 also all occur in the thinner wall section of the explosion-proof usefulness in the connecting portion.In the seal body of comparative example 9, the rib root portion on be located at connecting portion is dispersive stress also, and then the distortion tendency of necking down shape is arranged.

(4) press the relation of liter (increase of safety valve operating pressure) and connecting portion maximum displacement in

In the seal body of comparative example 9, under the maximum 6.5MPa of safety valve operating pressure, the connecting portion maximum displacement is 1.9mm during high temperature.In the seal body of this opposite embodiment 10, even interior pressure (safety valve operating pressure) is increased to 7.5MPa always, the connecting portion maximum displacement also is 1.13mm, even if also confirm during high temperature, also can avoid and prevent contacting with negative terminal plate.

The wall thickness of (5) the 1st wall thickness part and the relation of displacement

Depend on the setting of interior pressure (maximum safety valve operating pressure) exactly, yet contact with negative terminal plate when preventing high temperature,, can confirm and to set 0.45mm to the wall thickness of the 1st wall thickness part for the maximum displacement of setting connecting portion is below the 1.2mm.

4, estimate

Can do following evaluation according to above result.

(1) horizontal displacement and the stress distribution of drawing when clamping about considering the rotation press closing situation

In the seal body of embodiment 10, the horizontal stress absorption portion of drawing the stress that clamps generation of absorption is set, thereby can alleviates the burden of the thinner wall section of explosion-proof usefulness at connecting portion.

(2) about interior displacement and stress distribution of pressing 6.5MPa to do the time spent

When normal temperature (23 ℃), the safety valve of which kind of seal body of embodiment 10 and comparative example 9 also is movable displacement (displacement that the connecting portion of seal body contacts before the negative terminal plate is 1.2mm)., when high temperature (150 ℃), in the seal body of comparative example 9, the maximum displacement of connecting portion is 1.9mm, seal body contact negative terminal plate before the safety valve action.And, can think, from the necking down shape of connecting portion, owing to the wall thickness of connecting portion takes place just to stretch.Can think that according to these several aspects safety valve is failure to actuate during high temperature, seal body becomes dome-shaped.Opposite in this, in the seal body of embodiment 10, the maximum displacement of connecting portion is 0.91mm, before seal body contact negative terminal plate, can conclude that safety valve moves.

Seal body when (3) placing about overdischarge is subside and is broken

Seal body when placing as overdischarge is subside the main cause of breaking, can enumerate the thin-walled and the big this point of connecting portion deflection of coming of seal body connecting portion with thin-walled, yet according to above-mentioned result of the test, compare with comparative example 9, if adopt the seal body of the embodiment 10 that makes the connecting portion wall thickening, the deflection of connecting portion is reduced.And, about the internal stress of connecting portion, the seal body of embodiment 10 and the seal body of comparative example 9 are compared, can be suppressed to internal stress in the seal body of embodiment 10 about 60% internal stress of comparative example 9 seal bodies.So in the seal body of embodiment 10, because the reduction of such connecting portion internal stress, the seal body in the time of also can eliminating the overdischarge placement breaks.

(4) about the improvement of safety valve operating pressure and the shape of seal body

Can think the displacement of seal body connecting portion and the wall thickness that stress distribution depends primarily on connecting portion in the above-mentioned test, D portion shoulder height poor (wall thickness of the 1st wall thickness part) is analyzed as parameter.Can think when the preceding displacement of seal body connecting portion process negative terminal plate contact is 1.2mm, the specification that is the existing seal body (comparative example 9) of 6.5MPa by the safety valve operating pressure to the maximum, D portion shoulder height difference can be thinned to 0.35mm always, but can not make safety valve action maximum set value become 7.0mm.In order to improve safety valve action maximum set value, needing to establish D portion shoulder height difference as the seal body of embodiment 10 is 0.45mm.

" the 1st invention "

According to the invention of claim 1, thick more than 14 times the thick shell that makes shell portion of the shell of the closure part of encapsulating shell, though the reduced thickness of encapsulating shell shell portion becomes below the 0.18mm, still can prevent from really to ooze out phenomenon by the liquid that variations in temperature causes.Therefore, make the shell portion reduced thickness of encapsulating shell and increase the battery internal volume, and then in the alkaline dry battery that improves discharge capacity, also can guarantee good leakproof.

" the 2nd invention "

According to claim 2,3,4 invention, in the tubular alkaline dry battery of the resin system of outfit seal body, as the support unit that supports seal body from interior week, only use a slice to hold a concurrent post the metallic plate of negative terminal, simultaneously because its peripheral part forms the sweep of regulation, the actual internal volume of battery not only can be increased, and the leakproof (close property of liquid or sealing) of closure part can be improved.Therefore, can realize high power capacity, even and variations in temperature etc. sometimes, the alkaline dry battery of leakage does not take place yet.

" the 3rd invention "

According to the 3rd invention, in the tubular alkaline dry battery of the resin system of outfit seal body, as the support unit that supports seal body from interior week, when using negative terminal plate, even the negative terminal plate distortion also can suppress the cell height dimensional discrepancy that this distortion causes in the sealing process.

" the 4th invention "

According to the 4th invention, in the tubular alkaline dry battery of the resin system of outfit seal body, can avoid stress to concentrate when horizontal clamping is sealed, and can alleviate the burden of thin-walled portion to the thinner wall section of the explosion-proof usefulness of seal body.

" the 5th and the 6th invention "

According to the 5th and the 6th invention, in the tubular alkaline dry battery of the resin system of outfit seal body, can prevent that seal body from breaking, content disperses and the big sound and by the steam vent obturation that seal body causes of breaking takes place thereupon, can improve the reliability of safety valve, and then improve fail safe.

Claims (1)

1. alkaline dry battery, in the encapsulating shell inside that the round-ended cylinder shape is arranged, accommodate positive pole and negative pole, the dividing plate that disposes therebetween, reach electrolyte, resin system seal body is installed and from its support unit of interior Zhou Zhicheng in the open end of encapsulating shell, and employing is with the way of encapsulating shell and the fastening resin system seal body of support unit, the open end of encapsulating shell is sealed, it is characterized in that

As above-mentioned support unit, use 1 metallic plate of holding a concurrent post negative terminal plate; And

The part that spreads all over clamping resin system seal body between whole periphery conduct and the encapsulating shell at the peripheral part of this metallic plate, section at the center by this metallic plate when thickness direction cuts off it, it is below the 1mm that mean radius of curvature is set, and is spreading all over the bend that is bent to form greater than 90 angular ranges of spending;

This sweep is the section when thickness direction cuts off it at the center by this metallic plate, contacts in spreading all over greater than 90 angular ranges of spending with resin system seal body;

Bend by the circumference of the open end circumference of encapsulating shell and metallic plate carries out clamping with the resin seal body.

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