JP2006066175A - Sealed storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed storage battery capable of quick charging that will not shorten the battery life or break the battery. <P>SOLUTION: On the sealed storage battery formed by fixing a sealing plate 3 on an open end of a battery can via a gasket, making a flange part of a cap-shaped terminal 5 arranged at outside of the sealing plate contact the outer face of the sealing plate, arranging a valve body 9 in a space partitioned by the sealing plate and the cap-shaped terminal, and by sealing a through hole 8 formed on the sealing plate by the valve body for airtightly sealing the inside of the battery can, lead plates 6, 6' constituting a circuit connecting an electrode plate at one side and an external terminal are given the functions of a pressure switch 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealed storage battery having a built-in pressure switch that controls on / off switching of a circuit connecting at least one electrode plate and an external terminal in response to the magnitude of pressure inside the battery.

Secondary batteries that are mainly used as power sources for portable electronic devices include small valve-regulated lead-acid batteries, sealed alkaline batteries, and lithium secondary batteries, but sealed alkaline secondary batteries are used in heavy load applications. Batteries are often used. Nickel cadmium type and nickel hydride type are generally used for sealed alkaline storage batteries in large quantities. In particular, nickel-metal hydride has a higher energy density than nickel-cadmium, and does not contain harmful cadmium and has a low risk of environmental pollution. Therefore, portable electronic devices such as mobile phones, small electric tools, and small personal computers are used. The power supply is widely used as a power source of the kind, and the demand is dramatically increasing.
In addition, these electronic devices are reduced in power installation space due to demands for smaller size and lighter weight, while increasing power consumption due to multifunctionalization. For this reason, the storage battery used for these is required to have good rapid charging performance as well as a small size and high capacity. For the detection at the end of charging, battery voltage, temperature rise, and differential values with respect to those times are used. However, there is a drawback that it is not always possible to operate reliably depending on the use environment of the battery.

When rapidly charging a sealed storage battery, a conventional mechanical charging control method inside the electric ground is to cover the top of the battery and to electrically and electrically insulate the cap and battery case from each other. There has been proposed a method for intermittently charging current using an internal pressure applied to a grommet that is sealed. (For example, refer to Patent Document 1).
Similarly, there is also one in which the charging current is intermittently performed using the internal pressure of the battery and the force of the disc spring (see, for example, Patent Document 2).

US Patent Application Publication No. 2002 / 0119364A1 (page 7-8, FIGS. 6 and 7) U.S. Pat. No. 5,026,615 (columns 6-7, FIGS. 3, 4)

The sealed storage batteries proposed in Patent Document 1 and Patent Document 2 have the structure shown in FIG. 2 (with built-in pressure switch), and the charge control method is as follows.
In FIG. 2, a sealed storage battery 21 is a storage battery in which a wound electrode plate group is housed in a metal battery case 30 made of a nickel-plated steel plate having a bottomed cylindrical shape, and the open end of the battery case 30 is A grommet 26 made of synthetic resin such as polypropylene or polyamide and a conductive member 23 made of a metal such as nickel fitted in a through hole 27 provided in the center of the grommet 26 are hermetically sealed. One electrode plate 32 and the conductive member 23 constituting the electrode plate group are connected via a metal lead plate 33 such as nickel. A ring 24 made of metal such as nickel is joined to the side wall of the conductive member 23. A metal sealing plate 25 is fixed to the open end of the metal battery case 30 through the peripheral portion of the grommet 26, and the flange portion of the cap-shaped external terminal 29 is in contact with the outer surface of the sealing plate 25. .

The ring 24 is normally pressed (when the internal pressure of the storage battery is below a specified value) by being pressed by an elastic body 28 such as a rubber valve disposed in a space surrounded by the cap-shaped external terminal 29 and the sealing plate 25. It is in contact with the sealing plate 25 and the pressure switch 22 is on.
When gas is generated inside the storage battery during charging and the pressure inside the storage battery rises and exceeds the specified value during charging, the central portion of the grommet 26 bends upward in the figure, and the conductive member 23 moves upward. , The ring 24 and the sealing plate 25 are separated, and the circuit 22 is switched to an off state (pressure switch is off), and charging is temporarily suspended. The absorption of the gas accumulated in the internal space of the storage battery progresses during charging interruption, the pressure inside the storage battery decreases, and when the pressure falls below a specified value, the conductive member 23 is pushed back downward by the pressing force of the elastic body 28. Then, the ring 24 comes into contact with the sealing plate 25 and the pressure switch is switched from OFF to ON, and charging is resumed. In this way, the method proposed in Patent Document 1 prevents the pressure inside the storage battery from excessively rising by controlling charging on / off according to the pressure inside the storage battery. It suppresses that the temperature of a storage battery rises too much by the heat_generation | fever at the time of charge.

  In Patent Document 1, a through hole 31 having a small hole diameter is provided in the conductive member 23, and the exhaust passage for discharging the gas accumulated in the internal space of the storage battery when the pressure inside the storage battery rises abnormally is provided. It is shown. The gas is discharged to the outside through the through hole 31 and the exhaust hole 35 provided in the cap-shaped terminal 29. The outlet of the through hole 31 is sealed by the elastic body 28, and when the pressure inside the storage battery rises abnormally, a gap is generated between the elastic body and the upper surface of the conductive member 23, and the clearance is passed through the gap. An exhaust valve for discharging gas is configured. However, in this configuration, when the bending deformation of the central portion of the grommet 26 is not uniform, the conductive member 23 is inclined, so that the pressure that creates a gap between the conductive member 23 and the elastic body 28 is not constant, and the exhaust valve There is a possibility that a large variation occurs in the operating pressure. If the operating pressure of the exhaust valve is low, the exhaust valve will operate frequently, speeding up the disappearance of the electrolyte, and if the operating pressure of the exhaust valve is lower than the operating pressure of the pressure switch, the pressure switch will not function and charging is in progress In addition, the battery temperature may rise and the battery life may be shortened. If the operating pressure of the exhaust valve is high, the battery may be ruptured.

  As the exhaust valve, the conductive member 23 is not provided with the through hole 31, and the grommet 26 is provided with a thin portion 34, and when the internal pressure of the storage battery rises abnormally, a crack is generated in the thin portion 34, via the crack. Thus, a configuration in which gas is discharged to the outside is also conceivable. However, the pressure causing the cracks is not constant because it is greatly influenced not only by the thickness and cross-sectional shape of the thin portion but also by the molding conditions of the grommet, etc., and there is a drawback in that variations are likely to occur.

  The present invention was made in order to eliminate the disadvantages of the conventional sealed battery with a built-in pressure switch, and is suitable for rapid charging without reducing the reliability with which the exhaust valve operates. Is intended to provide.

The present invention solves the above-mentioned problem by adopting a pressure switch having the following configuration in a sealed storage battery with a built-in pressure switch.
The sealed storage battery according to the present invention has a sealing plate fixed to the open end of the battery case via a gasket, and the flange portion of the cap-shaped terminal disposed outside the sealing plate is brought into contact with the outer surface of the sealing plate, A valve body is disposed in a space partitioned by the sealing plate and the cap-shaped terminal, and a sealing hole in which the through hole provided in the sealing plate is sealed by the valve body and the inside of the battery case can be hermetically sealed. In the storage battery, when the internal pressure of the storage battery rises above a specified value to the lead plate that constitutes a circuit connecting the one electrode plate and the external terminal in the sealed space, the circuit is turned on. This is a sealed storage battery having a pressure switch function for switching from off to on when the internal pressure of the storage battery drops below a specified value.

  In the sealed storage battery according to the present invention, the lead plate is divided into two on the electrode plate side and the external terminal side, and when the internal pressure of the storage battery is lower than a specified value, the end of the lead plate on the electrode plate side and the external terminal When the end of the lead plate on the side abuts and the internal pressure of the storage battery rises above a specified value, the end of the lead plate on the electrode plate side and the end of the lead plate on the external terminal side separate from each other. The sealed storage battery according to claim 1, wherein the pressure switch is switched on and off.

  According to the first and second aspects of the present invention, the pressure for switching on / off the charging according to the magnitude of the pressure inside the storage battery without reducing the reliability of the exhaust function in the sealed storage battery. By providing the switch function, it is possible to provide a sealed storage battery that is highly safe and suitable for rapid charging.

  FIG. 1 is a diagram showing a basic structure of a configuration of a sealed storage battery (a sealed storage battery is also simply referred to as a battery hereinafter) 1 according to the present invention. In the battery 1, a wound electrode plate group 2 obtained by winding a laminate of a positive electrode plate, a separator, and a negative electrode plate in a spiral shape is accommodated in a bottomed cylindrical metal battery case 10, and the battery case 10 is opened. The end is closed by a sealing plate 3 having a cap 5 attached to the outer surface. The cap 5 also serves as an external terminal of one pole, and a valve body 9 made of, for example, a rubber valve is disposed in a space surrounded by the cap 5 and the sealing plate 3, and the valve body 9 is provided on the sealing plate 3. The inner space of the battery is hermetically sealed by pressing against the hole 8 and hermetically sealing the through hole 8. The valve body 9 serves as an exhaust valve, and the through hole 8 is normally hermetically sealed by the valve body 9, but when the pressure inside the battery becomes abnormally high, the valve body 9 As a result, a gap is generated between the valve body 9 and the sealing plate 3, and the gas accumulated in the battery is discharged out of the battery through the exhaust hole 11 provided in the cap 5.

The battery valve body 9 according to the present invention is not limited to a simple rubber valve. As shown in the example shown in FIG. 1, the valve body 9 is constituted by only a rubber valve, and a sealing body for closing the through hole 8 on the rubber valve and an elastic body 2 for pressing the sealing body against the through hole 8 are used. The valve body may be composed of a sealing body made of a rubber or synthetic resin plate and an elastic body made of a rubber molded body or a metal spring. It is good also as a structure which presses a sealing body to the through-hole 8 by pressing force.
According to this configuration, the through-hole 8 which is a gas discharge path is provided in the sealing plate 3 fixed to the battery case 10 and does not move and does not tilt obliquely with respect to the valve body 9. Fluctuations in valve operating pressure are unlikely to occur.

  The operating pressure of the exhaust valve can be set to an arbitrary value by adjusting the elastic stress arranged in the cap. The operating pressure of the exhaust valve is not particularly limited as long as it is higher than the operating pressure of the pressure switch described below (pressure for on / off switching operation) and lower than the pressure resistance of the battery case. However, in the case of a cylindrical nickel-metal hydride storage battery or nickel cadmium battery, the withstand voltage of the battery is 3.5 to 4 MPa, and the operating pressure of the pressure switch is preferably set to 1.2 to 2.5 MPa as described later. Therefore, it is preferable to set the operating pressure of the exhaust valve to 2 to 3 MPa. If the operating pressure of the exhaust valve is set to less than 2 MPa and the operating pressure of the pressure switch is set to a value lower than that, when quick charging is performed, the time for which the pressure switch is off becomes longer and charging is completed in a predetermined time. It can be difficult to do. Further, when the operating pressure of the exhaust valve is set to a value exceeding 3 MPa, the internal pressure of the battery rises beyond the pressure resistance of the battery case, and the battery may be damaged.

  In FIG. 1, 6 and 6 ′ are lead plates made of a metal plate for connecting one electrode plate 12 and the sealing plate 3 abutted against the cap 5. The polarities of the electrode plate 12 and the cap 5 are not particularly limited, but in the case of a cylindrical nickel-metal hydride battery or nickel cadmium battery, the electrode plate 12 is usually a positive electrode plate, and the cap 5 also serves as a positive electrode terminal. On the other hand, the battery case 10 made of metal and having a bottomed cylindrical shape also serves as a negative electrode terminal.

  The lead plate is divided into a lead plate 6 'on the electrode plate side and a lead plate 6 on the terminal side. In the pressure switch 13, the lead plate 6' and the lead plate 6 are normally connected and the pressure switch 13 is turned on. In this state, when the internal pressure of the battery rises above the specified value, the lead plate 6 'and the lead plate 6 are separated and the pressure switch 13 is turned off.

  The operating pressure of the pressure switch is not particularly limited, but in a nickel metal hydride battery or a nickel cadmium battery, the operating pressure of the pressure switch is preferably 1.2 to 2.5 MPa. If the operating pressure is less than 1.2 MPa, the charging interruption time becomes long when rapid charging is performed, and there is a possibility that sufficient charging cannot be performed within a predetermined time. Further, when the operating pressure is set to a value exceeding 2.5 MPa, the operating pressure of the exhaust valve approaches the withstand voltage of the battery, and the internal pressure of the battery may rise beyond the withstand voltage of the battery case. In addition, the battery temperature may increase during charging, leading to deterioration of battery performance.

In the battery according to the present invention, the structure of the pressure switch 13 is not particularly limited. However, the configuration is simple in that the lead plate is divided into the lead plate on the electrode plate side and the lead plate on the external terminal side, and the switch is turned on and off by abutting and releasing the tips of both lead plates in the pressure switch. Is advantageous.
A first example is shown in FIG. The pressure switch 13 shown in the example includes a frame body 14 made of a synthetic resin molded body, a diaphragm 15 made of a synthetic resin or a rubber sheet such as synthetic rubber or natural rubber, the elastic body 16 and the tip of the terminal-side lead plate 6. And the tip portion of the electrode plate side lead plate 6 '. A frame body sealed space 17 in which the peripheral edge portion of the diaphragm 15 is joined to the wall of the frame body 14 and the elastic body 16 is accommodated is hermetically sealed by the frame body 14 and the diaphragm 15. One wall surface of the frame body is provided with a through hole 18 so that the pressure in the space 19 in the frame body through which the leading end portion of the lead plate 6 and the leading end portion of the lead plate 6 'are inserted is equal to the pressure in the space in the battery. It is trying to become.

  Normally, as shown in FIG. 3A, the elastic body 16 is pressed, the tip portion of the terminal-side lead plate 6 and the tip portion of the electrode-side lead plate 6 ′ abut, and the pressure switch 13 is in an ON state. It is in. When the pressure inside the battery rises, as shown in FIG. 3B, the thickness of the elastic body 16 is reduced by the pressure applied to the diaphragm 15, and the tip of the terminal side lead plate 6 and the electrode side lead plate 6 '. The tip portion of the switch is separated, and the pressure switch is turned off.

FIG. 4 shows a second example of the pressure switch in the battery according to the present invention. In the second example, the pressure switch 13 includes a frame body 14 made of a synthetic resin molding, a distal end portion of the terminal side lead plate 6 inserted through the sealed space 17 in the frame body, and a distal end portion of the electrode plate side lead plate 6 '. A thin portion 20 is formed on the wall surface through which the tip of the lead plate of the frame body 14 is inserted.
Normally, as shown in FIG. 4 (a), the distal end portion of the terminal side lead plate 6 and the distal end portion of the electrode plate side lead plate 6 ′ are in contact with each other, and the pressure switch 13 is in an ON state.
When the pressure inside the battery rises, the wall surface of the frame body 14 provided with the thin portion 20 is curved inward as shown in FIG. 4B, and the terminal side lead plate 6 inserted through the wall surface along with the curvature. And the tip of the electrode plate side lead plate 6 'are separated from each other, and the pressure switch 13 is switched off.

FIG. 5 shows a third example of the pressure switch 13 in the battery according to the present invention. The pressure switch 13 shown in the example includes a frame body 14 made of a synthetic resin molded body, a diaphragm 15 made of a synthetic resin or rubber sheet, an elastic body 16 and the distal end portion of the terminal side lead plate 6, and an electrode plate side lead plate. It consists of a 6 'tip. A window 18 ′ provided on one wall surface of the frame body 14 is closed by a diaphragm 15 joined to the wall surface of the frame body. A sealed space 17 in the frame housing the elastic body 16 is hermetically sealed by the frame 14 and the diaphragm 15.
Normally, as shown in FIG. 5 (a), the tip end portion of the terminal side lead plate 6 and the tip end portion of the electrode plate side lead plate 6 'are in contact with each other, and the pressure switch 13 is in an ON state.
When the pressure inside the battery rises, as shown in FIG. 5 (b), the thickness of the elastic body is reduced by the pressure applied to the diaphragm 15, and the tip of the terminal side lead plate 6 and the tip of the electrode plate side lead plate 6 '. The part is separated and the pressure switch is switched off.

(Example)
A cylindrical nickel-metal hydride battery having the configuration shown in FIG. 1 and having a capacity of 2000 mAh and an AA size was produced. Specifically, a nickel electrode plate, a polypropylene non-woven fabric subjected to a sulfonation treatment, and a hydrogen storage alloy electrode plate were laminated, and the laminate was wound to form an electrode plate group. After welding one end of a positive electrode lead plate with a pressure switch to a tab provided on one long side of the nickel electrode plate, the electrode plate group is made of a nickel-plated steel plate having a thickness of 0.3 mm. Was inserted into a cylindrical battery case. Weld the flange of a nickel-plated steel plate cap with a built-in valve body on the outer surface of a nickel-plated steel sealing plate with a thickness of 0.5mm, outer diameter of 13mm, and a 0.8mm diameter hole in the center. Was pressed against the through hole provided in the sealing plate to close the through hole. Next, a polypropylene gasket was attached to the sealing plate. After the other end of the positive electrode lead plate is welded to the inner surface of the sealing plate, a predetermined amount of electrolyte is injected, the sealing plate is placed on the open end of the battery case, and the open end portion of the battery case is crimped to form a sealed battery. It was.

  The valve body is made of ethylene propylene rubber, and a molded body having an elliptical cross section with a diameter of 4.8 mm and a thickness of 2.7 mm is used. The compression ratio of the valve body {(original thickness of the valve body−valve after compression) The thickness of the body) / the original thickness of the valve body} was 25%. Fifty sealing plates with an exhaust valve having the above configuration were prepared, and the operating pressure of the exhaust valve was measured.

The pressure switch having the configuration shown in FIG. 3 was applied to the pressure switch. A nickel ribbon having a width of 2.5 mm and a thickness of 0.4 mm was used for the positive electrode lead plate (6, 6 '). A molded body made of polyamide resin having a thickness of 2 mm was used for the frame, and a positive lead plate (6, 6 ') was inserted through the wall of the frame. The overlapping length of the positive electrode lead plates 6 and 6 'was 2.5 mm. An ethylene propylene rubber sheet having a thickness of 0.5 mm was applied to the diaphragm 15, the peripheral edge of the diaphragm was adhered to the frame, and the space 17 containing the elastic body 16 was hermetically sealed. The elastic body 16 was made of an ethylene propylene rubber sheet having a diameter of 2 mm and a thickness of 2.0 mm, and the compression ratio of the elastic body with the pressure switch assembled was 20%. The tip of the positive electrode lead plate 6 ′ was bonded to the diaphragm 15. A through hole 18 having a diameter of 0.7 mm was provided on one wall surface of the frame body 14.
Fifty pressure switches were prepared, and the operating pressure of the switches was measured.

(Comparative example)
The configuration of the electrode plate group was the same as in the previous example. For the positive electrode lead plate 33, a nickel ribbon having a width of 2.5 mm and a thickness of 0.4 mm was used, and the material and thickness of the battery case 30 were the same as in the example.
The configuration of the pressure switch is the configuration of the pressure switch shown in FIG. 2, and the configuration of the exhaust valve is the same as the configuration shown in FIG. 2, but the conductive member 23 is not provided with the through hole 31, and the grommet 26 is provided with the thin portion 34. The configuration. The grommet 26 was a polypropylene molded body, and a V-shaped notch was provided on the wall surface to form a thin portion 34 having a thickness of 0.4 mm.
For the elastic body 28 constituting the pressure switch, a molded body made of ethylene propylene rubber was applied, and the compression ratio of the elastic body in a state where the battery was assembled was set to 20%.
In FIG. 2, 50 sealed containers that do not incorporate electrode plates are prepared, nitrogen gas is injected into the container, the operating pressure of the pressure switch, the breaking pressure of the thin portion 34 provided in the grommet 26 (the operation of the exhaust valve). (Corresponding to pressure).
Table 1 shows the distribution ranges of the operating pressure of the pressure switch and the operating pressure of the exhaust valve of the example and the comparative example.

前記のように排気弁の動作圧力は、圧力スイッチの動作圧力に比べて高く、電池の耐圧（クリンプシール方式の円筒形電池の場合、電池の内圧が耐圧を超えて上昇すると多くの場合クリンプシールが破壊される）に比べて低い値に設定するのが良い。クリンプシール方式の円筒形電池の場合、電池の耐圧は通常３．５〜４Mpaである。
実施例電池の排気弁の動作圧力は、分布範囲が狭く、且つ、圧力スイッチの動作圧力に比べて高く、電池の耐圧に比べて低く、排気弁の動作圧力と圧力スイッチの動作圧力および電池の耐圧との間に明らかに差がある。従って、実施例電池においては圧力スイッチが動作する以前に排気弁が動作して圧力スイッチの動作が阻害されることがない。また、電池の内圧が電池の耐圧を超える虞もない。
一方、比較例電池の排気弁の動作圧力はバラツキが大きく、低いものは圧力スイッチの動作圧力を下回る虞があり、高いものは電池の耐圧に接近した値である。従って、まれにではあるが、圧力スイッチが動作する以前に排気弁が動作したり、電池の内圧が耐圧を超える虞がある。

As described above, the operating pressure of the exhaust valve is higher than the operating pressure of the pressure switch, and the pressure resistance of the battery (in the case of a cylindrical battery of a crimp seal type, in many cases, when the internal pressure of the battery increases beyond the pressure resistance, the crimp seal It is better to set it to a lower value than In the case of a cylindrical battery of a crimp seal type, the withstand voltage of the battery is usually 3.5 to 4 MPa.
Example The operating pressure of the exhaust valve of the battery has a narrow distribution range and is higher than the operating pressure of the pressure switch and lower than the withstand pressure of the battery, and the operating pressure of the exhaust valve, the operating pressure of the pressure switch, and the operating pressure of the battery There is a clear difference between the breakdown voltage. Therefore, in the embodiment battery, the exhaust valve is not operated before the pressure switch is operated, and the operation of the pressure switch is not hindered. Further, there is no possibility that the internal pressure of the battery exceeds the withstand voltage of the battery.
On the other hand, the operating pressure of the exhaust valve of the battery of the comparative example has a large variation, a low one may be lower than the operating pressure of the pressure switch, and a high one is close to the pressure resistance of the battery. Therefore, although rarely, the exhaust valve may operate before the pressure switch operates, or the internal pressure of the battery may exceed the pressure resistance.

(Charge / discharge cycle test)
Thirty of each of the battery examples and comparative batteries were prepared, formed, and placed at an ambient temperature of 20 ° C. and subjected to a charge / discharge cycle test.
The battery was charged for 15 minutes at a constant voltage of 1.62 V, left for 1 hour, and discharged at a rate of 1 ItA and a cut voltage of 1.0 V. The charging / discharging was defined as one cycle, charging / discharging was repeated, and the cycle number of the battery was defined as the cycle number at which the discharge capacity was reduced to 80% of the discharge capacity at the first cycle.
The test results (average value, maximum and minimum value) are shown in Table 2.

表２に示す如く、実施例電池においては全ての電池のサイクル寿命が５００サイクルを上回っており、最大と最小の差も小さい。これは、充電時に圧力スイッチが正常に動作し、電池の温度上昇が抑制されたことと、排気弁が殆ど動作せずに済んだことで電解液の消耗が抑制されたためと考えられる。一方、比較例電池の場合は、３０個中２個サイクル寿命が３５０サイクルを下回った。比較例電池のうち、排気弁の動作圧力の低いものが、圧力スイッチが動作する以前に排気弁が動作したために、圧力スイッチの動作が阻害され、充電中に電池の温度が上昇したことと、電解液の消耗が多くなり寿命が速められたものと考えられる。

As shown in Table 2, in the example batteries, the cycle life of all the batteries exceeds 500 cycles, and the difference between the maximum and minimum is small. This is presumably because the pressure switch operated normally during charging, the battery temperature increase was suppressed, and the exhaust valve was hardly operated, and the consumption of the electrolyte was suppressed. On the other hand, in the case of the comparative battery, the cycle life of 2 out of 30 batteries was less than 350 cycles. Among the comparative example batteries, the exhaust valve having a low operating pressure was operated before the pressure switch operated, so that the operation of the pressure switch was hindered, and the temperature of the battery rose during charging, It is thought that the consumption of the electrolyte increased and the life was accelerated.

  The present invention can also be applied to nickel-metal hydride batteries and other sealed batteries other than nickel-cadmium batteries. However, particularly when applied to a nickel-metal hydride storage battery that is considered to be difficult to carry out rapid charging, the effect obtained is great.

  According to the present invention, in a sealed storage battery capable of rapid charging by incorporating a pressure switch, the reliability of the exhaust valve is increased by reducing variations in the operating pressure of the exhaust valve, and the sealed alkaline storage battery, particularly nickel. This is highly industrially useful in that it improves the life characteristics of the hydrogen battery and prevents damage to the battery such as rupture due to an abnormal rise in pressure in the storage battery.

It is principal part sectional drawing of the sealed storage battery which concerns on one Embodiment of this invention. It is principal part sectional drawing of the conventional sealed battery with a built-in pressure switch. It is a schematic diagram which shows the structure of the pressure switch which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the structure of the pressure switch which concerns on the 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the pressure switch which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

2 Electrode plate group 3 Sealing plate 5 Cap 6 Terminal side lead plate 6 'Electrode plate side lead plate 8 Sealing plate through hole 9 Valve body 13 Pressure switch 14 Frame body 15 Diaphragm 16 Elastic body

Claims (2)

  A sealing plate is fixed to the open end of the battery case via a gasket, and the flange portion of the cap-shaped terminal disposed outside the sealing plate is brought into contact with the outer surface of the sealing plate, and the sealing plate, the cap-shaped terminal, In a sealed storage battery in which a valve body is disposed in a space partitioned by a valve, a through hole provided in the sealing plate is sealed by the valve body, and the inside of the battery case is hermetically sealed, the inside of the sealed space In this case, when the internal pressure of the storage battery rises above the specified value, the circuit is switched from on to off when the internal pressure of the storage battery rises above the specified value. A sealed storage battery characterized by having a pressure switch function for switching the circuit from off to on when it falls below a value. The lead plate is divided into two parts, the electrode plate side and the external terminal side. When the pressure inside the storage battery is below a specified value, the end of the lead plate on the electrode plate side and the end of the lead plate on the external terminal side When the pressure inside the storage battery rises above the specified value, the end of the lead plate on the electrode plate side and the end of the lead plate on the external terminal side are separated to turn the pressure switch on / off. The sealed storage battery according to claim 1, which is performed.

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