JP3749048B2 - Square sealed battery and manufacturing method thereof - Google Patents

Description

４-３.実験結果の考察
上記表１から明らかなように、実施例では確実に従来よりもリーク発生数が抑制されていることが分かった。また突出部の高さが高いほどリーク発生数が少なく改善されている。本発明の突出部による効果、すなわち封口体と外装缶の開口部のレーザ溶接時に、ガスケットの変形が有効に防止されるため、電池の密閉性が良好に保たれていることが窺える。
【００３３】
なお、この実験の実施例では突出部の高さが０.５ｍｍのものに比べて１.０ｍｍ以上のものが優れた性能を呈した。したがって本発明の効果を十分に得るためには、突出部の高さを１.０ｍｍ以上突出させるのが望ましいと言える。
５.その他の事項
上記各実施の形態ではニッケル水素蓄電池について例を示したが、本発明は当然ながらこれに限定するものではなく、ニッケル・カドミウム蓄電池や、Ｌｉイオン電池などの非水電解液を用いる他の種類の角形密閉電池であってもよい。
【００３４】
また電極端子を正極、安全弁を負極にそれぞれ帯電させる例を示したが、この逆極性の構成であってもよい。
さらに、正極端子と安全弁の位置は上記各実施の形態の位置に限るものではない。ただし、生産性の向上や組電池としての使いやすさを考慮すれば、封口体上に前記両者を並設するのが望ましいと思われる。
【００３５】
さらに、本発明の電池のサイズは実施例で作製したものに限定するものではなく、これ以外のサイズであってもよい。ここで本発明は、電池の厚み（ｘ方向厚み）については、現行の金属製外装缶と封口体を有する角形密閉電池の厚みが約６ｍｍ程度であって、この厚み以下よりも小さくする場合に特に有効であることが発明者らによって明らかにされている。また正極端子の径（リング４１４の直径）は、実施例の３.０ｍｍよりさらに小さくすることも可能である。
【００３６】
また、実施の形態では正極端子と安全弁が別個に配設された例を示したが、突出部の内部に安全弁を内蔵してこれらを一体構成としても構わない。但し、この安全弁内蔵型の電極端子は構成が複雑になりやすい性質があり、部品構成の点からも小型化が難しい場合があるため、角形密閉電池をスリム化するためには実施の形態に示したように、電極端子と安全弁を別個に配設するのが望ましい。
【００３７】
【発明の効果】
以上のことから明らかなように、本発明は発電要素を外装缶に収納し、当該外装缶の開口部に対し封口体を加熱封止してなる角形密閉電池であって、封口体にはその主面から外側に筒状に突出した突出部が備えられるとともに、軸体がガスケットを介して前記突出部に挿設されることにより電極端子が構成され、前記突出部の先端において、前記軸体がカシメ処理により突出部に固定されて構成されるので、従来のように封口体と外装缶の開口部の加熱封止時にガスケットが熱影響を受けて変形するのが防止される。したがって、密閉角形電池をスリム化しても電池の密閉性を良好に維持することができる。
【００３８】
このような効果は、特に外装缶と封口体が金属製で両者をレーザ溶接する場合や、電極端子のサイズが比較的大きくなりやすいカシメ処理によって、封口体と電極端子とを連結する場合などに有効である。
【図面の簡単な説明】
【図１】本発明の実施の形態１の角形ニッケル水素蓄電池の外観斜視図である。
【図２】 前記角形ニッケル水素蓄電池の封口体を示す図である。
（ａ）
封口体の上部から見下ろした正面図である。
（ｂ）
封口体の一部断面図である。
（ｃ）
封口体の裏面図である。
【図３】正極端子付近の断面図である。
【図４】本発明の実施の形態２の角形ニッケル水素蓄電池の封口体を示す図である。
【図５】 従来型の角形ニッケル水素蓄電池の主要構成を示す一部断面斜視図である。
【図６】従来型の角形ニッケル水素蓄電池の封口体を示す図である。
（ａ）
封口体の上部から見下ろした正面図である。
（ｂ）
封口体の一部断面図である。
（ｃ）
封口体の裏面図である。
【符号の説明】
４０、７０ 封口体
４１、７１ 正極端子
４２、７２ 安全弁
５０ 外装缶
６０ 角形アルカリ蓄電池
４０１、７０１ 封口板
４０２、７０２ 開口部
４１０、７１０ 絶縁板
４１１、７１１ 端子リベット
４１２ 突出部
４１３ ガスケット
４１４ リング
４２１ 弁キャップ
４２２ 排気穴
４２３、７２３ 弁体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rectangular sealed battery and a method for manufacturing the same, and particularly to a technique for improving the structure of a sealing body.
[0002]
[Prior art]
In recent years, small electronic devices such as portable digital terminals (PDA) for personal use, as represented by mobile phones, are rapidly spreading. Since these electronic devices are required to have performance capable of withstanding continuous use over a relatively long period of time, research has been conducted to develop a small but high energy density battery as a power source.
[0003]
With such a background, a prismatic sealed battery such as a prismatic alkaline storage battery tends to be used for the electronic device. The prismatic alkaline storage battery has excellent features such as a larger electric capacity per unit volume than other types.
Here, FIG. 5 is a partial cross-sectional view showing a configuration of a prismatic nickel metal hydride storage battery which is an example of a prismatic alkaline storage battery. The nickel metal hydride storage battery 10 is mainly composed of an outer can 20, a power generation element 200, a sealing body 30, and the like. The size is, for example, thickness 6.1 mm × width 17.0 mm × height 35.5 mm.
[0004]
Both the outer can 20 and the sealing body 30 are formed by press-molding a nickel steel plate, and constitute a metal battery casing. Among these, on the main surface of the sealing body 30, one electrode terminal 31 (a positive electrode terminal in this figure) of about 3.5 mm square is disposed. In the positive electrode terminal 31, the cylindrical member 313 (see FIG. 6) is caulked through the gasket 312 on the inner side of the battery, and the sealing property between the positive electrode terminal 31 and the sealing body 30 is secured in this portion. .
[0005]
The power generation element 200 is formed by stacking a strip-shaped positive electrode plate 201, a separator 202, and a negative electrode plate 203 and impregnating them with an electrolytic solution, and is housed in the outer can 20. In the negative electrode plate 203, a hydrogen storage alloy is applied as an active material to the surface of a punching metal made of a nickel steel plate. The positive electrode plate 201 has a punching metal surface made of a nickel steel plate coated with an active material mainly composed of nickel hydroxide.
[0006]
Among these, the positive electrode plate 201 is electrically connected to the positive electrode terminal 31 via the tab 2010 and the positive electrode current collector 303.
The sealing body 30 is disposed in the opening 15 of the outer can 20 so that the spacer 21 and the insulating plate 302 face each other, and is laser-welded along the periphery of the opening 15. Thereby, the inside of the outer can 20 is sealed.
[0007]
Here, FIG. 6 is a detailed view of the sealing body 30. (A) is the front view of the sealing body 30, (b) represents AA 'partial sectional drawing, (c) represents a back view, respectively. As shown in FIG. 6B, a valve body 316 made of elastic rubber is built in the terminal cap 310, and normally the periphery of the vent 315 is pressed to seal the inside of the battery. When the internal pressure of the battery rises above a certain level, the valve body 316 is compressed upward by the gas pressure, and the gas inside the battery is exhausted from the exhaust port 311. As a result, the internal pressure of the battery decreases, and the valve body 316 returns to the original position again.
[0008]
Such prismatic alkaline storage batteries have been reduced in thickness to be slimmed down, but there is still a demand for further downsizing.
[0009]
[Problems to be solved by the invention]
However, if the width of the sealing body (width in the x direction) is reduced and slimming is performed, the peripheral edge of the sealing body at both ends in the width direction approaches the positive electrode terminal. In general, the sealing body and the opening of the outer can are heat-sealed by a method such as laser welding, so if the center of the resin part such as the gasket of the positive terminal is close to the welding location, it may be deformed by the influence of heat. There is. In particular, when the vicinity of the cylindrical member 313 of the positive electrode terminal 31 is heated, the gasket 312 is deformed, and the sealing performance inside the battery is easily lost, which may cause deterioration in battery performance.
[0010]
The present invention has been made in view of such a problem, and an object of the present invention is to provide a prismatic sealed battery that can be made slimmer without impairing the sealing performance of the battery, and a manufacturing method thereof.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a rectangular sealed battery in which a power generation element is housed in an outer can, and the sealing body is heat-sealed with respect to the opening of the outer can. Rutotomoni provided with a protrusion protruding in a cylindrical shape outwardly from the surface, the electrode terminal is constituted by the shaft body is inserted into the protrusion via a gasket, at the tip of the projecting portion, the shaft body Was fixed to the protrusion by caulking .
[0012]
In this way, the shaft body is fixed via the gasket at the protruding portion higher than the main surface of the sealing body, so that when the sealing body and the opening of the outer can are heat-sealed as in the past, there is a thermal effect. It becomes difficult to receive. Therefore, even if the battery width is reduced accordingly, damage to the gasket can be suppressed, and the rectangular sealed battery can be satisfactorily slimmed.
In addition, the present invention is applied to a case where the sealing body and the electrode terminal are connected by caulking treatment in which the size of the electrode terminal is likely to be relatively large. The effect that it becomes possible to attach an electrode tab directly to an electrode terminal is acquired.
[0013]
Furthermore, the present invention is such that both the sealing body and the outer can are made of metal, and even when the inside of the battery is hermetically sealed by laser welding of the both, resin parts such as gaskets are less susceptible to heat, Even if the battery is slimmed, high sealing performance can be maintained.
In addition, it is clear from the examples described later that the projecting part is desirably projected by 1 mm or more from the main surface of the sealing body.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1. Embodiment 1
1-1. Configuration of prismatic nickel metal hydride storage battery FIG. 1 is an external perspective view of a prismatic nickel metal hydride (Ni—H) storage battery 60 (hereinafter referred to as “battery 60”) according to the first embodiment. The battery 60 has substantially the same power generation element as the conventional prismatic nickel metal hydride storage battery 10 described above, but has a feature that the configuration in the vicinity of the sealing body 40 is clearly different from the conventional one.
[0015]
That is, as shown in the figure, the battery 60 is provided with a positive terminal 41 protruding from the main surface of the sealing body 40 and a safety valve 42 separately from the positive terminal 41. In the present embodiment, the positive electrode (electrode) terminal 41 and the safety valve 42 are provided independently.
The periphery of the sealing body 40 is laser-welded with the opening 51 of the outer can 50 to seal the inside of the battery. Further, since the valve cap 421 of the safety valve 42 is directly attached to the sealing plate 401, it has a negative polarity opposite to the positive terminal 41.
[0016]
Here, FIG. 2 is a detailed view of the sealing body 40. (A) is a front view of the sealing body 40, (b) is a BB 'partial sectional view, and (c) is a back view.
The safety valve 42 incorporates a valve body 423 made of elastic rubber in a valve cap 421 as shown in a partial cross-sectional view BB ′, and communicates with the inside of the battery through the opening 402 and the exhaust hole 422. However, normally, the valve body 423 presses the periphery of the opening 402 and is hermetically closed. Further, the valve cap 421 shown in (a) is directly fixed to the sealing plate 401 by welding or the like, and is charged to the same polarity (negative polarity) as the sealing plate 401 and the outer can 50.
[0017]
Next, FIG. 3 is a partial cross-sectional view of the sealing body 40 showing in detail the structure centered on the positive electrode terminal 41. The positive electrode terminal 41 has a configuration in which a terminal rivet 411 is fitted into a ring 414 with a head portion facing the inside of a battery in a cylindrical projecting portion 412 formed by drawing a sealing plate 401. A gasket 413 or the like is inserted between the ring 414 and the ring 414.
[0018]
Specifically, the terminal rivet 411 is sequentially passed through the insulating plate 410, the sealing plate 401, the gasket 413, and the ring 414 from the inside of the battery, and the tip end of the shaft of the terminal rivet 411 is caulked to form a deformed portion 4111. It is connected to the ring 414. Since the positive terminal 41 does not incorporate a safety valve therein, the positive terminal 41 can be made with a simple component structure while being very compact as compared with a conventional terminal incorporating a safety valve.
[0019]
The insulating plate 410 and the gasket 413 are made of nylon resin, and the terminal rivets 411 and the ring 414 are made of nickel steel.
The insulating plate 410 has a thickness in the z direction so as to fix the power generating element 200 in the outer can 50, and in order to attach the terminal rivet 411 at the center thereof, the insulating plate 410 is reversely concave along the BB ′ cross section. It has a letter shape (see FIG. 2). The protruding portion 412 has a sharp edge so that the edge cross section of the leading end portion 4121 is inclined. As a result, the leading end portion 4121 bites into the gasket 413 during the caulking process, thereby improving the airtightness inside the battery. To ensure that Further, the hook portion 4112 formed on the head of the terminal rivet 411 bites into the insulating plate 410 during the caulking process, and further airtightness between the terminal rivet 411 and the insulating plate 410 is secured. Here, in the figure, reference numeral 4113 denotes a drive mark generated during the caulking process.
[0020]
As described above, in the battery 50, the caulking process, which has been conventionally performed near the sealing plate 401, is mainly performed at the tip of the positive electrode terminal 41, so that the structure of the positive electrode terminal 41 near the sealing plate 401 can be simplified.
In addition, the member thickness of the protrusion part 412 is processed thinner than the thickness of the other part of the sealing board 401, and it is aimed at improving heat dissipation.
[0021]
According to the battery 50 described above, since the positive electrode terminal 41 is configured with a certain distance from the main surface of the sealing plate 401 by the protrusion 412, a portion related to sealing of the battery of resin parts such as the gasket 413 is associated with this. Compared to the prior art, the distance from the peripheral edge of the sealing body 40 is less likely to be affected by heat during laser welding of the opening 51 of the outer can 50. Therefore, even if the battery 60 is slimmed, the components of the positive electrode terminal 40 are prevented from being deformed, and the airtightness inside the battery is well maintained, so that the battery 60 having excellent performance can be obtained. In particular, the battery housings 401 and 50 are made of metal as in the case of the present battery 60 and both are sealed by high-temperature laser welding, so that the resin parts around the positive electrode terminal 41 are likely to be affected by heat. It is effective in the case.
[0022]
Further, in the first embodiment, the safety valve 42 (specifically, the valve cap 421) is integrated with the sealing plate 401 and is negatively charged. Therefore, the safety valve 42 can be used as a negative terminal. As a result, the present battery 60 has two polar electrode terminals arranged side by side on the sealing body, and is convenient when a plurality of batteries 60 are connected. Thus, the battery 60 exhibits excellent performance even if it is slimmed.
[0023]
2. Embodiment 2
2-1. Configuration of prismatic nickel-metal hydride storage battery (near the sealing body) FIG. 4 is a diagram showing the structure of the sealing body 70 of the prismatic nickel-metal hydride storage battery according to the second embodiment. As shown in the figure, the second embodiment is different from the first embodiment in that the positive electrode terminal is arranged at the center of the sealing plate 701. In the present invention, since the configuration centered on the positive electrode terminal 71 is very compact compared to the conventional case, the position of the positive electrode terminal 71 is further positioned on the sealing plate 701 while ensuring the same effect as in the first embodiment. It is also possible to change. This versatility seems to have the effect of flexibly adapting to the shape design of the battery according to its use, in addition to slimming the battery.
[0024]
3. Manufacturing method of prismatic nickel metal hydride storage battery Next, an example of the manufacturing method of the prismatic nickel metal hydride storage battery of each of the above-described embodiments will be described.
3-1. Production of exterior can The exterior can is produced by forming a nickel-plated steel plate (thickness 0.45 mm) by deep drawing using a punching die. As an example of the size of the outer can, the size of the outer can is further reduced as compared with the conventional type (FIG. 5), and the steel plate thickness is about 0.4 mm, the final thickness is 4.2 mm × the width is 26.0 mm × the height is 35.0 mm. be able to.
[0025]
3-2. Production of Sealing Body The sealing plate of the sealing body can be produced, for example, by punching a nickel-plated steel plate into a predetermined shape. However, the protrusion is formed by performing a deep drawing process. Here, the protruding amount of the protruding portion is about 1 mm from the surface of the sealing plate, and the thickness of the steel plate is 0.2 mm. At this time, the edge cross section at the tip of the projecting portion is sharpened by, for example, sharpening.
[0026]
Once the sealing plate has been formed, pass the nickel steel terminal rivet and ring (diameter: about 3.0 mm) through the resin gasket and insulating plate, respectively, and insert the tip of the terminal rivet by caulking. The positive terminal is completed by deforming and fixing.
In addition, a nickel steel valve cap (approx. 3mm square) is sealed from above while a valve body (diameter: 2.1mm) made of cylindrical elastic rubber made of ethylene-propylene (EPDM) is pressed against the vent hole of the sealing plate. A safety valve that is fixed to the plate and also serves as the negative terminal is completed.
[0027]
Thus, the sealing body is produced.
3-3. Production of power generation element A positive electrode plate is prepared by applying a positive electrode active material mainly composed of nickel hydroxide to a punching metal made of a nickel steel plate, and a negative electrode plate obtained by applying a hydrogen storage alloy to the punching metal. Respectively. Then, these electrode plates are alternately laminated through a porous sheet separator made of nylon resin to form a power generation element. At this time, a tab is attached to each punching metal of the negative electrode plate and the positive electrode plate. Note that a separator or a negative electrode plate (polarity different from that of the electrode terminal) is positioned on the outermost main surface of the power generation element. When the negative electrode plate is located on the outermost main surface, the negative electrode tab does not need to be attached because the negative electrode plate directly contacts the outer can.
[0028]
3-4. Completion of the battery The power generation element produced above is housed in an outer can, and a tab extending from the positive electrode plate is connected to the positive electrode terminal by spot welding or the like. Thereafter, an electrolytic solution made of a 30 wt% potassium hydroxide (KOH) aqueous solution is poured into the outer can. And a sealing body is arrange | positioned in the opening part of an armored can, and sealing is carried out by laser welding the boundary vicinity of both, and the inside of a battery is sealed.
[0029]
Thereby, a square nickel metal hydride storage battery is completed.
In this embodiment, the electrode terminal and the tab of the positive electrode plate of the power generation element may be connected (welded) first, and then the terminal rivet may be fixed through the sealing plate. If it carries out like this, workability | operativity will improve rather than connecting an electric power generation element to the electrode terminal fixed to the sealing board, and the effect that a yield is improved can be anticipated.
[0030]
4. Example and its Evaluation 4-1. Production of Battery In order to examine the effect of the present invention, a prismatic nickel metal hydride storage battery of Embodiment 2 was produced as an example. The basic specifications were as follows, and 10,000 protrusions were produced for the protrusions having heights of 0.5 mm, 1.0 mm, and 2.0 mm, respectively.
[0031]
In addition, as a comparative example, 10,000 square-shaped nickel metal hydride storage batteries having no conventional protrusions (that is, the protrusions having a height of 0.0 mm) were manufactured.
Battery outer dimension: steel plate thickness 0.4mm, thickness 4.2mm x width 26.0mm x height 35.0mm
Nominal capacity: 650 mAh
4-2. Performance Evaluation Experiment A leak generation (internal sealing property) evaluation experiment was performed for each of the batteries produced above. Specifically, each battery was charged at 0.1 C for 16 hours, and then discharged (approximately 5 hours) until the voltage reached 1.0 V at 0.2 C with a pause of 1 hour. This was determined by observation with the naked eye or by discoloration of the phenolphthalein solution (transparent to red) to determine whether the battery had a leak.
[0032]
The results of these experiments are summarized in Table 1 below.
[Table 1]

4-3. Consideration of Experimental Results As is clear from Table 1 above, it was found that the number of leak occurrences was surely suppressed in the examples as compared with the prior art. Further, the higher the height of the protruding portion, the smaller the number of leaks and the improvement. Since the deformation of the gasket is effectively prevented during the effect of the protrusion of the present invention, that is, the laser welding of the opening of the sealing body and the outer can, it can be seen that the battery is well sealed.
[0033]
In this experimental example, a projection having a height of 1.0 mm or more exhibited superior performance as compared with a projection having a height of 0.5 mm. Therefore, it can be said that in order to sufficiently obtain the effects of the present invention, it is desirable to project the height of the projecting portion by 1.0 mm or more.
5. Other Matters In the above embodiments, examples of nickel-metal hydride storage batteries have been shown. However, the present invention is not limited to this example, and non-aqueous electrolytes such as nickel-cadmium storage batteries and Li-ion batteries are used. Another type of square sealed battery may be used.
[0034]
In addition, although the example in which the electrode terminal is charged to the positive electrode and the safety valve is charged to the negative electrode has been shown, a configuration of this reverse polarity may be used.
Furthermore, the positions of the positive terminal and the safety valve are not limited to the positions of the above embodiments. However, considering the improvement of productivity and the ease of use as an assembled battery, it seems desirable to arrange both of them on the sealing body.
[0035]
Furthermore, the size of the battery of the present invention is not limited to that produced in the examples, and other sizes may be used. In the present invention, the thickness of the battery (x-direction thickness) is about 6 mm when the thickness of the current rectangular outer battery having a metal outer can and a sealing body is smaller than this thickness. The inventors have shown that this is particularly effective. Further, the diameter of the positive electrode terminal (the diameter of the ring 414) can be made smaller than 3.0 mm in the embodiment.
[0036]
In the embodiment, the positive terminal and the safety valve are separately provided. However, the safety valve may be built in the projecting portion and may be integrated. However, this safety valve built-in electrode terminal tends to be complicated in configuration, and it may be difficult to reduce the size in terms of component configuration. Therefore, in order to reduce the size of the square sealed battery, it is shown in the embodiment. As described above, it is desirable to arrange the electrode terminal and the safety valve separately.
[0037]
【The invention's effect】
As is apparent from the above, the present invention is a rectangular sealed battery in which the power generation element is housed in an outer can and the sealing body is heat-sealed with respect to the opening of the outer can. Rutotomoni provided with a protrusion protruding in a cylindrical shape outward from the main surface, the electrode terminal is constituted by the shaft body is inserted into the protrusion via a gasket, at the tip of the projecting portion, the shaft Since the body is configured to be fixed to the protruding portion by caulking, it is possible to prevent the gasket from being deformed due to heat influence during the heat sealing of the sealing body and the opening of the outer can as in the prior art. Therefore, even if the sealed prismatic battery is slimmed, the sealing performance of the battery can be maintained well.
[0038]
Such an effect is particularly useful when the outer can and the sealing body are made of metal and both are laser welded, or when the sealing body and the electrode terminal are connected by caulking, which tends to make the electrode terminal size relatively large. It is valid.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a prismatic nickel metal hydride storage battery according to a first embodiment of the present invention.
FIG. 2 is a view showing a sealing body of the prismatic nickel metal hydride storage battery.
(A)
It is the front view looked down from the upper part of a sealing body.
(B)
It is a partial cross section figure of a sealing body.
(C)
It is a reverse view of a sealing body.
FIG. 3 is a cross-sectional view in the vicinity of a positive electrode terminal.
FIG. 4 is a diagram showing a sealing body of a prismatic nickel metal hydride storage battery according to a second embodiment of the present invention.
FIG. 5 is a partial cross-sectional perspective view showing the main configuration of a conventional prismatic nickel metal hydride storage battery.
FIG. 6 is a view showing a sealing body of a conventional prismatic nickel metal hydride storage battery.
(A)
It is the front view looked down from the upper part of a sealing body.
(B)
It is a partial cross section figure of a sealing body.
(C)
It is a reverse view of a sealing body.
[Explanation of symbols]
40, 70 Sealing body 41, 71 Positive terminal 42, 72 Safety valve 50 Exterior can 60 Square alkaline storage battery 401, 701 Sealing plate 402, 702 Opening 410, 710 Insulating plate 411, 711 Terminal rivet 412 Projection 413 Gasket 414 Ring 421 Valve Cap 422 Exhaust holes 423, 723 Valve body

Claims (12)

A prismatic sealed battery in which a power generation element is housed in an outer can and the sealing body is heat-sealed with respect to the opening of the outer can,
The sealing body is provided with a protruding portion that protrudes in a cylindrical shape outward from the main surface, and an electrode terminal is configured by inserting a shaft body into the protruding portion via a gasket,
At the tip of the projecting portion, prismatic sealed battery characterized in that it is fixed to the projecting portion and the shaft body by caulking processing.   2. The rectangular sealed battery according to claim 1, wherein both the sealing body and the outer can are made of metal, and both are laser welded to seal the opening of the outer can.   3. The prismatic sealed battery according to claim 1, wherein the projecting portion projects 1 mm or more outward from the main surface of the sealing body.   4. The prismatic sealed battery according to claim 1, wherein a member thickness of the protruding portion is formed thinner than a thickness of the other part of the sealing body.   The protruding portion has a configuration in which a tip end edge thereof is sharply formed and a gap between a sealing body and a shaft body is sealed by biting a leading end of the protruding portion into a gasket. The square sealed battery according to any one of 4.   The shaft body is a rivet-like member having a head portion provided with a hook portion on the battery inner side, the shaft body penetrates the insulating plate and is fixed to the protruding portion of the sealing body, and the hook portion is attached to the insulating plate. 6. The prismatic sealed battery according to claim 1, wherein a space between the sealing body and the shaft body is sealed by biting.   The shaft body of the electrode terminal is insulated from the sealing body side by a gasket, and a resettable safety valve is disposed on the sealing body separately from the electrode terminal. Square sealed battery. A first step of forming a cylindrical protrusion from the main surface of the sealing body toward the outside of the battery;
A second step of inserting a shaft body into the projecting portion through a gasket and fixing the shaft body to the projecting portion by caulking at the tip of the projecting portion ;
And a third step of storing the power generation element in an outer can and heat-sealing the opening of the outer can with the sealing body. The method for manufacturing a rectangular sealed battery according to claim 8 , wherein, in the first step, the thickness of the protrusion is formed thinner than the other part of the sealing body. In the first step, formed by drawing so that the edge cross section of the tip of the protrusion is inclined,
The method for manufacturing a rectangular sealed battery according to claim 8 or 9 , wherein, in the second step, the tip of the protruding portion is bitten into the gasket. In the second step, a shaft body of a rivet-like member having a head portion provided with a hook portion on the battery inner side is used, and the shaft body is fixed to the projecting portion of the sealing body through the insulating plate, and the hook portion The method for manufacturing a rectangular sealed battery according to any one of claims 8 to 10 , wherein the insulating plate is bitten. In the third step, after wearing metallic sealing body into the opening of the metal outer can, according to one of claims 8 to 11, characterized in that sealing by laser welding both A method for manufacturing a rectangular sealed battery.

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