JP2005050744A - Cylindrical alkaline storage battery and charger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means which, by providing a function of giving a warning by an expensive means so as not to touch a battery risen in temperature by charging, and by stopping charging by detecting the warning, suppresses rising of the temperature of the storage battery during charging to a specified value or less when super-boosting charging is performed and suppresses deterioration of the storage battery. <P>SOLUTION: A thermo paint which tarnishes when the temperature becomes to have a specified value or more and after tarnishing returns to the original color by changing color again when the temperature falls to the specified value or less is arranged at the side face of a positive electrode terminal of a cylindrical alkaline storage battery or at the side face edge close to the positive electrode terminal out of the side face of the battery. Furthermore, the thermo paint is arranged on the surface of a member made of good conductor of heat arranged at the position contacting the positive electrode output terminal of a charger for cylindrical alkaline storage battery or side face edge close to the positive electrode terminal of the cylindrical alkaline storage battery. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cylindrical alkaline storage battery such as a nickel metal hydride storage battery or a nickel cadmium storage battery, and a charger for the same.

  In recent years, alkaline storage batteries such as nickel metal hydride storage batteries and nickel cadmium batteries have been widely used as power sources for small information terminal devices such as mobile phones, personal computers, and electric tools. In addition, there is a strong demand for speeding up charging in response to the desire to recharge the battery in as short a time as possible and use the battery again after the battery capacity has been used up.

  When the alkaline storage battery is charged extremely rapidly as described above, the battery temperature during charging rises. In the case of an alkaline storage battery, if the temperature of the battery rises above 60 to 70 ° C., the active material and the separator may be altered or the electrolytic solution may be consumed, resulting in a decrease in electrical performance.

2. Description of the Related Art In recent years, alkaline storage batteries have been proposed that enable ultra-rapid charging in which charging of a fully used battery is completed within 30 minutes. According to this proposal, when the internal pressure of the sealed alkaline storage battery rises above a specified value, the charging circuit is switched from ON to OFF, and when the internal pressure of the battery decreases and falls below the specified value, the charging circuit is turned off. By incorporating a pressure switch with a pressure switch function that switches to ON, it is possible to suppress an increase in temperature during charging even when performing ultra-rapid charging. (For example, see Patent Document 1)
WO 02/35618 A1 publication (FIG. 2A, FIG. 2B) However, even if the storage battery is provided with the pressure switch function, the surface of the battery should be charged by ultra-rapid charging under the condition that the ambient temperature exceeds 25 ° C. It is difficult to avoid the temperature rising to 60-70 ° C. In this way, when super-rapid charging is performed in an atmosphere where the ambient temperature is high, if the temperature of the battery is set to less than 60 ° C., the amount of charge electricity is suppressed low, and there is a possibility that sufficient charging cannot be performed. In addition, when ultra-rapid charging is performed at a high temperature such that the ambient temperature exceeds 30 ° C., it cannot be said that the temperature of the storage battery being charged exceeds 70 ° C. at all. Without knowing that the battery temperature has risen above 70-80 ° C, you may feel abnormal heat when touching the battery when removing the battery from the charger or when charging is finished, or if the battery temperature is Further, when the temperature becomes high, there is a risk of burns, which is not preferable.

  In addition to providing the storage battery with a pressure switch function, there is an attempt to provide a charger with a temperature switch function by incorporating a temperature sensitive ferrite, a temperature sensitive semiconductor (CTR) or a temperature sensitive resistor (PTC element) into the charging circuit. . However, even if this method is used, if ultra-rapid charging is performed, it is difficult to avoid the battery surface temperature from rising to 60 to 70 ° C., as in the case where a pressure switch is provided in the storage battery. Moreover, in the said patent document 1, arrange | positioning a strain meter in a charger and propose | closing that charging is terminated by detecting that the distortion of the external shape exceeding a regulation value generate | occur | produced in the to-be-charged battery. However, this method is mechanically complicated and has the disadvantage that the charger is expensive.

  The present invention has been made in view of the shortcomings of attempts to charge the conventional cylindrical alkaline storage battery in an ultra-rapid manner, and the cylindrical alkaline storage battery and the alkaline storage battery charger are complicatedly modified in terms of mechanism. Without charging the storage battery, it is possible to know at a glance whether the temperature of the highest temperature part of the battery surface is above or below the specified value. Thus, a function for issuing a warning so as not to touch a battery whose temperature has been raised to a temperature higher than a specified value is provided, or a function for notifying that the end of charging has been reached.

  When the temperature of the cylindrical alkaline storage battery according to the present invention is equal to or higher than the specified value at the side surface end (hereinafter referred to as the positive electrode side surface end) near the positive electrode terminal of the side surface of the positive electrode terminal or the battery side surface. The cylindrical alkaline storage battery is characterized by disposing a temperature indicating paint that changes color and changes color once when the temperature drops below a specified value. The discoloration here includes so-called color development (coloring when the battery temperature exceeds a specified value).

  A cylindrical alkaline storage battery according to the present invention is characterized in that when the battery temperature exceeds a specified value, the temperature indicating paint has a function to display that the battery temperature is high by letters or a figure. Type alkaline storage battery.

  Moreover, the cylindrical alkaline storage battery according to the present invention is a cylindrical alkaline storage battery in which the temperature indicating paint is disposed, and the internal pressure of the battery is increased to a specified value or more in a circuit that electrically connects the positive electrode and the positive electrode terminal. It is a cylindrical alkaline storage battery that incorporates a pressure switch function that switches the circuit from ON to OFF from time to time, and switches the circuit from OFF to ON when the battery internal pressure drops below a specified value.

  The quick charger for a cylindrical alkaline storage battery according to the present invention is a charger for a cylindrical alkaline storage battery, and has output characteristics necessary for ultra-rapid charging, and is close to the positive terminal of the positive output terminal or the side of the battery. It is a battery charger for alkaline storage batteries in which the temperature indicating paint is arranged on the surface of a member made of a good heat conductor arranged at a position in contact with the side edge.

  According to the first and fourth aspects of the present invention, it can be seen at a glance whether or not the temperature of the storage battery being charged is equal to or higher than a specified value, and it is effective for preventing the storage battery heated to exceed the specified value from being touched. It is. Further, the discoloration of the temperature indicating paint can be applied as a signal notifying the timing for stopping the charging.

  According to claim 2 of the present invention, it is possible to effectively notify the user that the temperature of the storage battery is in a high temperature state and dangerous.

  According to claim 3 of the present invention, it is effective to avoid the temperature of the storage battery being charged from exceeding a specified value as much as possible.

  FIG. 1 is a diagram showing an appearance of a cylindrical alkaline storage battery 1 according to the present invention. The temperature indicating paint 5 is disposed directly on the side surface of the cap-like positive electrode terminal 2 of the storage battery 1 or on the positive electrode side surface end 4 on the surface of the metal battery case. The positive side edge 4 as used herein refers to the vicinity of the ridge line 7 in contact with the ridge line 7 where the side surface 2 of the battery and the upper surface 6 of the battery on which the positive electrode terminal 3 is disposed, of the side surface 2 of the battery. The temperature indicating paint 5 is disposed on the surface of the side surface end portion 4 so as to substantially contact the ridgeline 7. With this arrangement, the temperature indicating paint placed on the battery can be seen from the outside even during charging. FIG. 1 shows an example in which the temperature indicating paint is disposed on the side surface of the positive electrode terminal 2 terminal or a part of the positive electrode side surface edge 4, but the temperature indicating paint is applied to the side surface of the positive electrode terminal 2 terminal or the positive electrode side surface end of the cylindrical battery. If it arrange | positions over the perimeter of the part 4, even if a battery is inserted how with respect to a charger, since a temperature indicating paint can be seen from the outside, it is a more preferable embodiment.

  In addition, when the cylindrical alkaline storage battery is charged extremely rapidly, the positive electrode terminal of the battery surface reflects the temperature inside the battery well and becomes the highest temperature. Further, the end portion (positive electrode side surface end portion 4) close to the positive electrode terminal on the battery side surface also exhibits a temperature close to the positive electrode terminal. Therefore, by setting it as the above arrangement, the internal temperature of the storage battery is well reflected in the temperature indicating paint, and the temperature of the hottest portion of the surface of the storage battery can be displayed.

  Incidentally, the temperature of the battery side surface at the time of ultra-rapid charging becomes lower as it goes away from the positive side edge, and the temperature of the battery side close to the negative terminal (the bottom surface of the storage battery) is 3 to 3 compared to the positive side edge. It is about 6 ° C lower. This is probably because gas absorption generated during charging is concentrated near the upper side (positive electrode terminal side) of the electrode plate, and heat generated by gas absorption is biased toward the upper side of the electrode plate group. Therefore, it is considered that the temperature of the positive electrode terminal connected to the upper side of the electrode plate group by a nickel conductive wire which is a good conductor of heat or the side edge of the positive electrode side surface adjacent to the upper side of the electrode plate group becomes high. . Thus, it is considered that the temperature of the positive electrode terminal and the side surface end of the positive electrode side well reflects the temperature of the high temperature part inside the battery.

  If the discoloration temperature of the temperature indicating paint disposed on the positive electrode terminal or the positive electrode side surface in the above configuration is 70 to 80 ° C., the battery that has been heated to a temperature at which there is a risk of burns is prevented from being inadvertently touched. be able to. For this purpose, it is preferable that the temperature indicating paint has a function of displaying characters or figures that the battery is hot. An example is shown in FIG. For example, when the battery temperature exceeds 70 ° C., as shown in FIG. 2, the temperature indicating paint disposed on the side edge of the positive electrode side of the battery 1 develops the letters “high temperature attention”. By giving this function to the temperature indicating paint, it is possible to inform the user of the danger more effectively. Although FIG. 2 shows an example in which characters are displayed, it is also effective to display a figure (which may be a picture) at a glance that the temperature of the storage battery is high.

  Furthermore, if a color change temperature of 60 to 70 ° C. or 50 to 70 ° C. is applied in the above configuration, it is possible to see at a glance whether or not the temperature of the storage battery being charged (the temperature of the high temperature part) exceeds a temperature that is undesirable for the storage battery. If it exceeds, it is possible to prevent the storage battery from being placed at an undesirably high temperature by terminating the charging immediately. According to the present invention, it is possible to know the end point of charging without providing a complicated mechanism in the storage battery or the charger.

  In the present invention, the outside of the temperature indicating paint is preferably covered with a heat-shrinkable transparent or translucent resin film 8, such as a hishi tube. In addition, when the surface of the battery is covered with an opaque exterior label, a window may be opened in a portion where the exterior label overlaps with the temperature indicating paint so that the temperature indicating paint can be seen, or the exterior label may be made transparent only at that portion. desirable. The color change temperature of the temperature indicating paint can be appropriately selected and applied within the range of 50 to 80 ° C. Further, by arranging a plurality of temperature indicating paints having different color change temperatures at the same time, it is possible to obtain more detailed temperature information than arranging one kind of temperature indicating paint. For example, by simultaneously applying two types of color change temperatures of 50 to 70 ° C. and 70 to 80 ° C., it is possible to know the end point of charging and whether or not it is a temperature at which the battery can be touched.

  As the temperature indicating paint, a commercially available one can be applied, and its form is not particularly limited. For example, a paint shape, a crayon shape, a label, or a emblem can be applied. These temperature indicating paints are commercially available, for example, from Nippon Oil Giken Co., Ltd. under trade names such as thermo paint, thermo tape, thermo sheet, thermo label, thermo emblem. The temperature indicating paint applied to the present invention changes color when the temperature of the measured object (alkaline storage battery in the present invention) rises above a specified value, and after the temperature indicating paint changes color once, the measured object is cooled, and the temperature is When the color drops below a specified value, the color returns to the original color (hereinafter simply referred to as color restoration), and has a function of repeatedly performing the color change and restoration. The discoloration of the temperature indicating paint indicates that the temperature of the storage battery has been raised to a specified value or more, and the return of the color is a signal to notify that the temperature of the storage battery has decreased to a specified value or less.

  The alkaline storage battery according to the present invention is preferably a cylindrical alkaline storage battery in which the temperature indicating paint is disposed directly on the outer surface of a metal battery case. Thus, by arranging the temperature indicating paint directly on the outer surface of the metal battery case, it is possible to know that the temperature of the battery surface has risen to the specified value or more without any time delay. It is an alkaline storage battery in which the outside of the paint is covered with a transparent or translucent resin film. By covering the outer surface of the temperature indicating paint with a transparent or translucent film, it is possible to prevent the temperature indicating paint from being worn during use of the storage battery or from touching an acid, alkali, organic solvent, etc. .

  The cylindrical alkaline storage battery according to the present invention is discolored when the temperature becomes a specified value or more at a side end near the positive electrode terminal of the side surface of the positive electrode terminal or the side surface of the battery case. A cylindrical alkaline storage battery with a temperature indicating paint that returns to its original color when it drops below, when the pressure inside the battery rises above a specified value in a circuit that electrically connects the positive electrode and the positive electrode terminal The storage battery incorporates a pressure switch function that switches the circuit from OFF to ON when the circuit is switched from ON to OFF and the internal pressure of the battery decreases and falls below a specified value. By setting it as this structure, it can suppress as much as possible that the temperature of the storage battery in charge rises exceeding a regulation value.

  FIG. 3 is a diagram schematically showing the internal structure of the cylindrical alkaline storage battery 21 provided with the pressure switch 22. In FIG. 3, 29 is a cap that also serves as a positive electrode terminal, and 30 is a metal battery case that also serves as a negative electrode terminal. The positive electrode plate 10 and the positive electrode terminal 29 are connected via a positive electrode lead piece 9, a metal connection member 23, a metal connection ring 24 bonded to the connection member 23, and a metal lid 25 bonded to the positive electrode terminal. Yes. The connecting member 23 is pushed downward by the pressing force of the rubber elastic body 28, and a metal connecting ring 24 joined to the connecting member 23 is physically in contact with the metal lid 25 by the pressing force. . The internal space of the storage battery is hermetically sealed by a connecting member 23 inserted through a synthetic resin molded body 26 and its cylindrical through hole 27. When gas accumulates inside the storage battery and the internal pressure increases, the connection member 23 is pushed upward against the pressing force of the elastic body, and the connection ring 24 joined to the connection member and the metal lid 25 are separated. The circuit is cut off and turned off. When the internal pressure of the storage battery decreases, the connection member 23 is pushed downward, the contact between the connection ring and the metal lid 25 again, and the circuit is turned on.

  In the present invention, the temperature indicating paint can be disposed not on the surface of the storage battery but on the storage battery mounting portion of the charger. FIG. 4 is a diagram showing an embodiment of a charger for a cylindrical alkaline storage battery according to the present invention. A member 36 made of a good heat conductor is connected to the positive electrode output terminal 34 of the charger main body 31 having the input cord 35, and the temperature indicating paint 5 is disposed on the surface of the member 36. Or the member 37 which consists of a good heat conductor is attached to the part which contact | abuts the side surface edge part 4 by the side of the positive electrode terminal of the storage battery 1 of the mounting part 32 of a cylindrical storage battery, and the temperature indicator 5 is arrange | positioned on the surface of this member 37. You can also As a material for forming a member made of a good heat conductor, for example, copper or aluminum can be applied. By configuring the cylindrical alkaline storage battery charger to have this configuration, it is possible to obtain the same function as when the temperature indicating paint is disposed on the surface of the storage battery.

  The cylindrical alkaline storage battery charger according to the present invention preferably has an output characteristic necessary for ultra-rapid charging and has a function of issuing an alarm signal when a specified time has elapsed after the start of charging. With this configuration, without monitoring the battery being charged, the temperature of the battery rises above a specified value, knows immediately when the temperature indicating paint is likely to change color, and confirms that the temperature indicating paint has changed color. To stop charging. In this way, the discoloration of the temperature indicating paint can be used as a charge stop signal.

(Example 1)
A thermolabel having a discoloration temperature of 60 ° C. was attached to the side end of the positive electrode side of a metal battery of an AA size cylindrical nickel metal hydride storage battery having a capacity of 1800 mAh. Thereafter, the side surface of the battery was covered with a transparent heat-shrinkable tube (Hishi tube). The battery was charged at 7200 mA (corresponding to 4 ItA) at room temperature (ambient temperature 28 ° C.). Charging was stopped when the thermolabel attached to the surface of the storage battery changed color (changed from bright yellow red to dark brown) (10 minutes after starting charging). The color of the temperature indicating paint returned 10.9 minutes after the start of charging. In addition, the temperature sensor was attached to the side edge part of the positive electrode side of a storage battery, and the temperature during charge was monitored.

(Example 2)
A thermolabel having a color change temperature of 70 ° C. was affixed to the side end of the positive electrode side of a metal battery of an AA size cylindrical nickel metal hydride storage battery having a capacity of 1800 mAh. Thereafter, the side surface of the battery was covered with a transparent heat-shrinkable tube (Hishi tube). The battery was charged at 7200 mA (corresponding to 4 ItA) at room temperature (ambient temperature 28 ° C.). Charging was stopped by a timer switch when 11 minutes had elapsed since the start of charging. The thermolabel changed color (changed from red to dark brown) 10.6 minutes after the start of charging, and the color of the thermolabel was restored 13.5 minutes after the start of charging. In addition, the temperature sensor was attached to the side edge part of the positive electrode side of a storage battery, and the temperature during charge was monitored.

(Comparative Example 1)
For comparison, a storage battery having the same configuration was charged at 7200 mA for 16 minutes at the same temperature except that no thermolabel was attached.

  FIG. 5 shows the result of monitoring the temperature of the storage battery. In the case of Example 1, the surface temperature of the storage battery slightly increased even after the charge was stopped, but the temperature started to decrease slightly after the charge stop, and about 1 minute after the storage battery temperature exceeded 60 ° C. as shown in FIG. Later, the temperature decreased to 60 ° C. or lower, and at the same time, the color of the temperature indicating paint returned. In the case of Example 2, the temperature of the storage battery decreased to 70 ° C. or less 2.5 minutes after stopping charging, and at the same time, the color of the temperature indicating paint was restored. In the case of Comparative Example 1, the temperature of the storage battery during charging exceeded 100 ° C. as shown in FIG.

  According to the embodiment shown in Example 1, it was possible to know at a glance that the temperature of the storage battery during charging exceeded a specified value (in the case of Example 1, 60 ° C.), and that the temperature indicating paint was discolored. By knowing and stopping charging, the storage battery can be prevented from being placed at an undesirably high temperature for a long time. According to the embodiment shown in Example 2, it is possible to know at a glance that the temperature of the storage battery has dropped to a specified value (70 ° C. in the case of Example 2) after charging is stopped. It can be confirmed that it is safe to touch the battery visually. On the other hand, in the case of the comparative example 1, the temperature of a storage battery will exceed the upper limit (60 degreeC in Example 1) of a preferable temperature range over a long time during charge. Moreover, there is a possibility that the battery is touched without knowing that the temperature of the storage battery is high (over 100 ° C. in Comparative Example 1) and feels abnormal heat.

  Further, in Example 1, if a charger is provided with an alarm function that informs that the temperature indicating paint is about to change color 8 to 9 minutes after the start of charging, color change occurs without monitoring continuously during charging. You can know the time immediately before.

(Example 3)
AA-sized cylindrical nickel-metal hydride storage battery 21 having a capacity of 1800 mAh, which is equipped with the pressure switch 22 having an operating pressure of 2.4 megapascals (MPa) shown in FIG. 2, was tested. It was used for.

  A thermolabel having a discoloration temperature of 60 ° C. was attached to the positive side end of the metal battery of the alkaline storage battery provided with the pressure switch. Then, the side surface of the battery was covered with the above-mentioned Hishi tube. The battery was charged at 7200 mA (corresponding to 4 ItA) at room temperature (ambient temperature 28 ° C.). The thermolabel affixed to the surface of the storage battery changed color 12.7 minutes after the start of charging, and charging was stopped at that time. In addition, the temperature sensor was attached to the side edge part of the positive electrode side of a storage battery, and the temperature during charge was monitored.

(Comparative Example 2)
For comparison, a storage battery having the same configuration as in Example 3 was charged at 7200 mA at the same temperature for 16 minutes except that no thermolabel was attached.

  The result of monitoring the temperature of the storage battery during charging in Example 3 and Comparative Example 2 is shown in FIG. As shown in FIG. 6, in the third embodiment, the charging time can be made longer than that in the first embodiment (this means that the third embodiment has a larger amount of charge electricity than the first embodiment. Means that.) Compared to Example 1, the charging time of Example 3 was made longer because of the effect of suppressing the temperature increase of the storage battery during charging compared to Example 1 due to the action of the pressure switch function in Example 3. It is. Furthermore, in Example 3, the temperature of the storage battery exceeds the upper limit of the preferable temperature range (60 ° C. in Example 2) during charging in a very short time. This is because, in the case of Example 3, due to the action of the pressure switch, the rate of temperature increase of the storage battery during charging was reduced, and charging was immediately stopped when the temperature indicating paint changed color. In Comparative Example 2, the increase in the storage battery temperature during charging is suppressed by the action of the pressure switch as compared with Comparative Example 1, but the storage battery temperature during charging gradually increases but the temperature rises to 60 ° C. Slightly exceeded. The temperature of the storage battery exceeds the upper limit of the preferred temperature range during charging by disposing the temperature indicating paint on the storage battery having a pressure switch as in Example 3 and detecting that the temperature indicating paint has changed color and stopping charging. It can be avoided as much as possible.

(Other embodiments)
In the above embodiment, a plurality of temperature indicating paints having different color changing temperatures, for example, two temperature indicating paints having a color changing temperature of 60 ° C. and 70 ° C. or 55 ° C. and 70 ° C. are attached to the surface of the storage battery at the same time. It is possible to know at a glance whether or not the temperature exceeds the upper limit of the preferred temperature range and whether or not the temperature of the storage battery has fallen below the safe temperature even when touching the battery. Alternatively, more detailed information can be obtained by applying a digital thermo tape (the temperature is indicated by a number).

  FIG. 4 is a diagram showing an embodiment of the alkaline storage battery charger according to the present invention. The charger includes an input cord 35 and a storage battery mounting portion 32 in addition to a main body 31 having an output terminal 34 (only a positive output terminal is shown in the figure. The negative output terminal is hidden and cannot be seen). 4 shows an example in which the storage battery mounting part is removable from the main body 31, but the storage battery mounting part may be integrated with the main body). As shown in FIG. 4, the temperature indicating paint can be arranged on the surface of the member 36 made of a good heat conductor connected to the positive terminal 34 without arranging the temperature indicating paint in the storage battery 1. Moreover, the member 37 which consists of a good heat conductor can be attached to the position which contacts the positive electrode side surface edge part of a storage battery of the storage battery mounting part 32 which consists of a synthetic resin molded object, and the temperature-indicating paint 5 can also be arrange | positioned on the surface. . The member 37 is made of a metal that is a good conductor of heat, and a material excellent in heat conduction such as copper or aluminum is particularly desirable. As shown in FIG. 4, the temperature indicating paint can be seen from the outside even during charging by deriving one end of the member to a position where it can be seen from the outside and placing the temperature indicating paint on the derived portion.

  Although not described in the above embodiment, it is also effective to dispose the temperature indicating paint on the side surface of the cap-like positive terminal as described above. In this case, the temperature indicating paint to be applied is preferably a crayon type or a paint type. Further, as described above, the fact that the temperature of the battery exceeds the specified value can also be displayed with characters or figures. Further, the ambient temperature at the time of charging is not particularly limited, and is effective at any temperature as long as it is in a range not more than a temperature undesirable for the storage battery.

It is a figure which shows the external appearance of the cylindrical alkaline storage battery which concerns on this invention. It is a figure which shows the external appearance (part) of the cylindrical alkaline storage battery which concerns on this invention. It is a figure which shows the structural example of the pressure switch integrated in the alkaline storage battery. It is a figure which shows typically the structural example of the charger which concerns on this invention. It is a graph which shows the temperature of the storage battery when charging the alkaline storage battery which concerns on 1 embodiment of this invention, and a comparative example. It is a graph which shows the temperature of the storage battery when charging the alkaline storage battery which concerns on 1 embodiment of this invention, and a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical alkaline storage battery 2 Positive electrode terminal 4 Positive terminal side surface edge part 5 Thermal paint 8 Resin film 22 Pressure switch 36, 37 Member which consists of a good conductor of heat

Claims (4)

The color changes to the side of the positive electrode terminal or the side edge of the battery near the positive electrode terminal when the temperature exceeds the specified value. A cylindrical alkaline storage battery characterized in that a temperature indicating paint that returns to color is arranged. 2. The cylindrical alkaline storage battery according to claim 1, wherein when the battery temperature exceeds a specified value, the temperature indicating paint has a function of displaying that the battery temperature is high by letters or a figure. Switch the circuit from ON to OFF when the battery internal pressure rises above a specified value, and switch the circuit when the battery internal pressure drops below the specified value. The cylindrical alkaline storage battery according to claim 1 or 2, wherein a pressure switch function for switching from OFF to ON is incorporated. A charger for a cylindrical alkaline storage battery, wherein the temperature indication is provided on a surface of a member made of a good conductor of heat disposed at a position in contact with a side edge near the positive output terminal of the charger or the positive terminal of the cylindrical alkaline storage battery. A battery charger for a cylindrical alkaline storage battery characterized in that a paint is disposed.

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