JP3524744B2 - Sealed alkaline storage battery - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed alkaline storage battery such as a nickel-hydrogen storage battery or a nickel-cadmium storage battery, and more particularly to a sealed alkaline storage battery for quick charging which can be charged in a short time.

[0002]

2. Description of the Related Art Alkaline storage batteries such as nickel-hydrogen storage batteries and nickel-cadmium storage batteries can be hermetically sealed due to their excellent overcharge performance and are used in various portable devices. In the recent battery market, the demand for batteries that satisfy the following conditions is extremely high. That is, (1) charging is possible in a short time. (2) It has a long life. (3) High capacity. (4) Miniaturization is possible. In particular, in the market for small portable electric / electronic / communication equipment power sources or EV applications, along with further miniaturization and weight reduction, alkaline storage batteries are also becoming smaller and lighter, and at the same time have higher capacity and shorter capacity. Higher performance such as hourly charging is desired.

When charging an alkaline storage battery, it is general to charge it at a constant current or constant voltage at a charge rate of about 0.1 C (C: nominal capacity) to 1 C. However, in such a charging method, that is, when charging at a charging rate of 0.1C, the charging time is about 16 hours, and when charging at a charging rate of 1C, the charging time is about 1 hour. Met.

[0004]

Therefore, the inventors of the present invention charged in a very short time of less than about 3 minutes (super rapid charging).
We examined an alkaline storage battery that can do the above.
There has never been an alkaline storage battery that can be charged in an extremely short time of less than about 3 minutes, but this is due to the following reasons.

That is, for example, when the charging time is 3 minutes, a charging rate of 20C is required, and when the charging time is 1 minute, a charging rate of 60C is required. When charging at such a large charging rate, a very large charging stream flows inside the battery, so that each part inside the battery becomes a large resistance and heat generation is one of the causes. I can think. This causes problems such as a decrease in capacity and a method of treating gas generated inside the battery.

In nickel-cadmium storage batteries,
The general charging method is a constant current (constant current),
Regarding the reaction inside the battery, in the first stage, oxidation and reduction of the electrode active material occur to become an endothermic reaction, and in the second stage, the positive electrode active material becomes overcharged to generate oxygen gas. This oxygen gas moves to the negative electrode side and reacts with metal cadmium (Cd) to be absorbed (recombined). This recombination is an exothermic reaction and the battery temperature rises. Such an increase in temperature inside the battery lowers the charge acceptability at the positive electrode and melts the resin parts such as the separator and the sealing gasket. In particular, the current collecting tab portion that connects the positive electrode current collector and the sealing body that also serves as the positive electrode terminal generates a large amount of heat, and the resin parts around it are melted to cause an internal short circuit.

As a countermeasure against these heat generation, it is considered to reduce the internal resistance of the battery by improving the size of the electrode plate. Regarding the electrode plate size, since the electrode plate width is limited by the battery size, it is almost fixed. Therefore, the electrode plate dimensions can be changed only by the electrode plate length and thickness.

Therefore, considering the electrode plate area, the energy density of the conventional alkaline storage battery is 300 to 450.
Since it is mAH / cm ² and the thickness is 0.5 to 1.0 mm (for example, see Battery Manual (published by Maruzen)),
The positive electrode plate area is 22 to 57 cm with respect to the conventional positive electrode plate capacity.
^It can be seen that it is ² / Ah. For example, the area of the positive electrode plate with respect to the SC size positive electrode plate capacity widely used for rapid charging is 1300 mAh for the positive electrode plate capacity.
As a general electrode plate size, electrode plate width 34 mm x length 200
It is 57 cm ² / Ah because mm is used. This value is in the range of 22 to 57 cm of the positive electrode plate area described above.
It is the upper limit of ² / Ah.

The area of the positive electrode plate with respect to this positive electrode plate capacity is
Resistance of 20C or more charging odor Te batteries internal components (plates) is increased, causing the electrolysis reaction of water from an initial stage of charging, oxygen gas and hydrogen gas is generated. This gas generation causes a decrease in the charging efficiency of the battery. The present invention, order to address the above problems, even if the ultra-rapid charging of the charging time is less than 5 minutes, things ku charging of the positive electrode is decreased, the heat generation of the internal power <br/> battery The purpose is to be able to suppress.

[0010]

A resolution to means and operations and effects thereof] The present invention, for achieving the above object, and housed in the battery container in which stored the alkaline electrolyte is opposed via a separator positive electrode plate and the negative electrode plate A sealed alkaline storage battery in which the same battery container is sealed , wherein the area of one surface of the positive electrode plate is the positive electrode plate capacity.
Is characterized by 70 to 110 cm ² / Ah
The present invention provides a sealed alkaline storage battery.

When the area of the positive electrode plate with respect to the capacity of the positive electrode plate is increased as described above, the current density per unit area is reduced and the ratio of the active material in the unit area is reduced when charged by the same charging current. Therefore, the conductivity is improved in high rate charging. Then, in order to increase the electrode plate area with the same capacity and the same cell size, it is necessary to reduce the electrode plate thickness, but when the electrode plate thickness is decreased, the distance between the core body and the active material is shortened. As a result, the resistance component is reduced, the voltage at the start of charging is reduced, and the chargeability of the positive electrode is significantly improved. However, if the area of the positive electrode plate is increased too much, the thickness of the electrode plate becomes too thin, and the filling ability of the active material is lowered, and the absolute capacity is lowered. For this reason,
The area of one surface of the positive electrode plate is 70 to 110 with respect to the capacity of the positive electrode plate.
It is good preferable to prescribe in cm ² / Ah.

It is the current collecting tab portion that connects the positive electrode current collector and the sealing member that generates the most heat inside the battery. By reducing the resistance value of this current collecting tab portion, the heat generation at the current collecting tab portion occurs. Can be suppressed. By suppressing the heat generation in the current collecting tab portion, it is possible to prevent the resin parts around the current collecting tab portion from being melted by the heat generation, and thus it is possible to prevent the occurrence of a short circuit inside the battery. Further, by suppressing the heat generation in the current collecting tab portion, it becomes possible to reduce the energy loss, so that the capacity can be increased.

In order to suppress heat generation in the current collecting tab portion, it is preferable to regulate the resistance value of the current collecting tab portion to 4 × 10 ⁻⁶ mΩ or less. Further, as a method of reducing the resistance value of the current collecting tab portion, increasing the thickness of the current collecting tab portion,
There are methods such as shortening the length of the current collecting tab portion or using a metal having good conductivity such as aluminum (Al) or copper (Cu).

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. 1. Preparation of Nickel Positive Electrode Plate Example 1 Positive electrode plate area relative to positive electrode plate capacity after filling with active material (one side)
Is adjusted to 72 cm ² / Ah to a nickel sintered substrate whose thickness is adjusted to 0.36 mm, the step of impregnating nickel nitrate by a chemical impregnation method and then generating nickel hydroxide by alkali treatment is repeated 6 times. A predetermined amount of nickel hydroxide active material is filled. The nickel electrode plate filled with a predetermined amount of the active material is subjected to a brushing treatment, dried at 80 ° C., and then cut to have a width of 32.5 mm and a length of 290 mm, and the positive electrode plate with respect to the positive electrode plate capacity. Area (one side) is 7
The nickel positive electrode plate a of Example 1 is manufactured by adjusting the pressure to be 2 cm ² / Ah.

Example 2 Positive electrode plate area relative to positive electrode plate capacity after filling with active material (one side)
Has a thickness of 0.20 mm so that it is 105 cm ² / Ah.
The step of impregnating the nickel sintered substrate prepared as described above with nickel nitrate by the chemical impregnation method and then generating nickel hydroxide by alkali treatment is repeated 6 times to fill a predetermined amount of the nickel hydroxide active material. The nickel electrode plate filled with a predetermined amount of the active material is subjected to a brushing treatment, dried at 80 ° C., and then cut into a width of 32.5 mm and a length of 420 mm, and the positive electrode plate with respect to the positive electrode plate capacity. The nickel positive electrode plate b of Example 2 is manufactured by adjusting the area (one surface) to be 105 cm ² / Ah.

Comparative Example 1 Positive electrode plate area (one side) relative to positive electrode plate capacity after filling with active material
Is 20 cm ² / Ah, the nickel sintered substrate whose thickness is adjusted to 0.70 mm is impregnated with nickel nitrate by the chemical impregnation method, and the step of generating nickel hydroxide by alkali treatment is repeated 6 times. A predetermined amount of nickel hydroxide active material is filled. The nickel electrode plate filled with a predetermined amount of the active material is subjected to a brushing treatment, dried at 80 ° C., and then cut to have a width of 32.5 mm and a length of 80 mm. Area (one side) is 20
The nickel positive electrode plate c of Comparative Example 1 is manufactured by adjusting so as to be cm ² / Ah.

Comparative Example 2 Positive electrode plate area (one side) relative to positive electrode plate capacity after filling with active material
The thickness is adjusted to be 38 cm ² / Ah, and the nickel sintered substrate whose thickness is adjusted to 0.59 mm is impregnated with nickel nitrate by the chemical impregnation method and then the step of generating nickel hydroxide by alkali treatment is repeated 6 times. A predetermined amount of nickel hydroxide active material is filled. The nickel electrode plate filled with a predetermined amount of the active material is subjected to a brushing treatment, dried at 80 ° C., and then cut to have a width of 32.5 mm and a length of 150 mm. Area (one side) is 3
The nickel positive electrode plate d of Comparative Example 2 is manufactured by adjusting the pressure to be 8 cm ² / Ah.

Comparative Example 3 Positive electrode plate area relative to positive electrode plate capacity after filling with active material (one side)
Is 45 cm ² / Ah, and a nickel sintered substrate whose thickness is adjusted to 0.57 mm is impregnated with nickel nitrate by a chemical impregnation method, and then a step of generating nickel hydroxide by alkali treatment is repeated 6 times. A predetermined amount of nickel hydroxide active material is filled. The nickel electrode plate filled with a predetermined amount of the active material is subjected to a brushing treatment, dried at 80 ° C., and then cut to have a width of 32.5 mm and a length of 180 mm, and the positive electrode plate with respect to the capacity of the positive electrode plate. Area (one side) is 4
The nickel positive electrode plate e of Comparative Example 3 is manufactured by adjusting the pressure to be 5 cm ² / Ah.

Comparative Example 4 Positive electrode plate area (one side) relative to positive electrode plate capacity after filling with active material
The thickness is adjusted to be 52 cm ² / Ah, and the nickel sintered substrate whose thickness is adjusted to 0.54 mm is impregnated with nickel nitrate by the chemical impregnation method, and the step of generating nickel hydroxide by alkali treatment is repeated 6 times. A predetermined amount of nickel hydroxide active material is filled. The nickel electrode plate filled with a predetermined amount of the active material is subjected to a brushing treatment, dried at 80 ° C., and then cut to have a width of 32.5 mm and a length of 210 mm, and the positive electrode plate with respect to the positive electrode plate capacity. Area (one side) is 5
The nickel positive electrode plate f of Comparative Example 4 is manufactured by adjusting the pressure to be 2 cm ² / Ah.

Comparative Example 5 Positive electrode plate area (one side) relative to positive electrode plate capacity after filling with active material
Is 120 cm ² / Ah, the thickness is 0.15 mm
The step of impregnating the nickel sintered substrate prepared as described above with nickel nitrate by the chemical impregnation method and then generating nickel hydroxide by alkali treatment is repeated 6 times to fill a predetermined amount of the nickel hydroxide active material. The nickel electrode plate filled with a predetermined amount of the active material is subjected to a brushing treatment, dried at 80 ° C., and then cut to have a width of 32.5 mm and a length of 490 mm, and the positive electrode plate with respect to the positive electrode plate capacity. The nickel positive electrode plate g of Comparative Example 5 is manufactured by adjusting the area (one surface) to be 120 cm ² / Ah.

Comparative Example 6 Positive electrode plate area relative to positive electrode plate capacity after charging active material (one side)
Has a thickness of 0.10 mm so that the thickness becomes 145 cm ² / Ah.
The step of impregnating the nickel sintered substrate prepared as described above with nickel nitrate by the chemical impregnation method and then generating nickel hydroxide by alkali treatment is repeated 6 times to fill a predetermined amount of the nickel hydroxide active material. The nickel electrode plate filled with a predetermined amount of the active material is subjected to a brushing treatment, dried at 80 ° C., and then cut to have a width of 32.5 mm and a length of 580 mm, and the positive electrode plate with respect to the positive electrode plate capacity. The nickel positive electrode plate h of Comparative Example 6 is manufactured by adjusting the area (one surface) to be 145 cm ² / Ah.

2. Preparation of Nickel / Cadmium Storage Battery Next, as shown in FIG. 1, a to h nickel positive electrode plates 12 and a to h nickel positive electrode plates 12 in which the positive electrode plate area (one side) with respect to the positive electrode plate capacity is adjusted as described above. Using a sintered cadmium negative electrode plate 11 produced by a known production method so as to have an area of about 1.0 to 1.3 times the area of the plate 12,
The spirally wound electrode bodies 14 are manufactured by spirally winding them through the separators 13, respectively.

The end portion 11a of the cadmium negative electrode plate 11 of each of the spiral electrode bodies 14 and the disk-shaped current collector plate 15 for the negative electrode are spot-welded, and the end portion 12a of the nickel positive electrode plate 12 and the positive electrode for the positive electrode are formed. Spot welding is performed on the disk-shaped current collector plate 16. It should be noted that the disk-shaped current collector 16 for the positive electrode extends from the disk-shaped current collector 16 and extends from the disk-shaped current collector lead portion (current collector tab) 18.
Are integrally formed. Further, each of these disc-shaped current collector plates 15 and 16 is provided with a large number of through holes.

On the other hand, a metal outer can 10 which also serves as a bottomed cylindrical negative electrode terminal is prepared, and each of the current collecting plates 15 and 16 is prepared as described above.
The spirally wound electrode body 14 welded with is inserted into the metal outer can 10, and the bottom of the negative electrode current collector plate 15 and the metal outer can (negative electrode terminal) 10 are spot-welded, and then the current collecting lead part (current collecting tab) 1
Bottom part 17a of the sealing body 17 whose tip part of 8 also serves as a positive electrode terminal
The disc-shaped current collector plate 16 for the positive electrode and the sealing body (positive electrode terminal) 17 are electrically connected to each other by welding.

Then, each of the metal outer cans 10 has 30
After injecting an electrolytic solution consisting of an aqueous solution of potassium hydroxide (KOH) of wt%, a sealing gasket 19 is placed on the upper opening of the metal outer can 10, and the upper opening of the metal outer can 10 is placed inward. Tightly seal, A, B, C, D, E, F,
SC and nickel-cadmium storage batteries with nominal capacities of 1300 mA for G and H are prepared.

3. Battery capacity test Each of A, B, C, D, E, F, G, H nickel
The battery capacity of the cadmium storage battery was measured as follows. That is, 60C (78000m in an atmosphere of 25 ° C)
After charging for 1 minute with the charging stream of A), it is paused for 1 hour. Then, 1C (1300mA) in an atmosphere of 25 ° C
The discharge current is discharged until the final voltage reaches 1.0 V, and the battery capacity is calculated from the discharge time.
The results are shown in FIG. Note that FIG. 2 and Table 1 show the correlation of the battery capacity with the area of the positive electrode plate, and the battery capacity of the nickel-cadmium storage battery E having a positive electrode area of 45 cm ² / Ah was set to 100.

[0027]

[Table 1]

As is clear from Table 1 and FIG.
In the case of ultra-quick charging at a charging rate of 60 C, the positive electrode area per positive electrode plate capacity is 22 to 52 cm, which is the conventional value.
It can be seen that the battery capacity is improved by increasing from ² / Ah to 55 to 110 cm ² / Ah. The positive electrode area per positive electrode plate capacity is 70 to 110 cm ² / Ah.
It becomes more preferable to set it in the range of. However, when the positive electrode area per positive electrode plate capacity is 110 cm ² / Ah or more, the thickness of the electrode plate becomes too thin (the electrode plate thickness is 0.15 mm or less), the filling amount of the active material becomes small, and the absolute capacity becomes Battery capacity is decreasing due to decrease.

As described above, the area of the positive electrode plate relative to the capacity of the positive electrode plate is 55 to 1 from the conventional value (22 to 52 cm ² / Ah).
Increasing to 10 cm ² / Ah reduces the current density per unit area and reduces the ratio of the active material in the unit area when charged by the same charge current (in other words, nickel per active material). Increase the amount of sintered body). Also, the same electrode plate capacity and the same cell size (height and diameter)
In order to increase the electrode plate area, the electrode plate width cannot be changed, so the electrode plate thickness must be reduced and the electrode plate must be lengthened.

However, by reducing the thickness of the electrode plate, the distance between the core of the nickel sintered body and the active material is shortened, the resistance component of the electrode plate is reduced, and the voltage at the start of charging is reduced. As a result, the conductivity between the active material and the nickel sintered body is improved,
The chargeability of the nickel positive electrode is significantly improved. When the charging is performed with a large current such as a charging rate of 60 C or more, the effect is further enhanced. Further, the improvement of the conductivity with the nickel sintered body can delay the time of the electrolysis reaction of water at the nickel positive electrode, and the chargeability is further improved. However, it is not preferable to increase the area of the positive electrode too much, because the thickness of the electrode plate becomes too thin, the filling amount of the positive electrode active material decreases, and the capacity decreases.

4. Examination of current collecting tab Next, using the nickel cadmium storage battery of A described above, the battery capacity when changing the resistance value by changing the thickness of the current collecting lead part (current collecting tab) 18 of this nickel cadmium storage battery And consider the temperature rise.

Embodiment 3 Current collecting lead portion (current collecting tab) 1 as shown in FIG. 1 described above.
8 has the same shape as the current collecting lead portion and has a predetermined thickness (for example, 1.5
(mm) metal plate is welded at a plurality of points so that the resistance value of the current collecting lead portion (current collecting tab) 18 is 1.3 × 10 ⁻⁶ mΩ (milliohm). Thus, the resistance value is 1.
A nickel-cadmium storage battery was prepared as shown in FIG. 1 using a current collector 16 having a current-collecting lead portion (current-collecting tab) 18 adjusted to 3 × 10 ⁻⁶ mΩ (milliohm). Is a nickel-cadmium storage battery I of Example 4.

Embodiment 4 Current collecting lead portion (current collecting tab) 1 as shown in FIG. 1 described above.
8 has the same shape as the current collecting lead portion and has a predetermined thickness (for example, 0.7
A 5 mm) metal plate is welded at a plurality of points to adjust the resistance value of the current collecting lead portion (current collecting tab) 18 to 2.6 × 10 ⁻⁶ mΩ (milliohm). As shown in FIG. 1, a nickel-cadmium storage battery is used by using the current collector 16 having the current collecting lead portion (current collecting tab) 18 whose resistance value is adjusted to 2.6 × 10 ⁻⁶ mΩ (milliohm). The prepared nickel-cadmium storage battery is referred to as nickel-cadmium storage battery J of Example 4.

Embodiment 5 Current collecting lead portion (current collecting tab) 1 as shown in FIG. 1 described above.
8 has the same shape as the current collecting lead portion and has a predetermined thickness (for example, 0.5
The metal plate of m) is welded at a plurality of points and adjusted so that the resistance value at the current collecting lead portion (current collecting tab) 18 is 3.8 × 10 ⁻⁶ mΩ (milliohm). In this way, the resistance value is 3.8.
A nickel-cadmium battery was prepared as shown in FIG. 1 using a current collector 16 having a current-collecting lead portion (current-collecting tab) 18 adjusted to × 10 ⁻⁶ mΩ (milliohm), and this nickel-cadmium battery was prepared. The nickel-cadmium storage battery K of Example 5 is used.

Comparative Example 7 Current collecting lead portion (current collecting tab) 1 as shown in FIG. 1 described above.
8 has the same shape as the current collecting lead portion and has a predetermined thickness (for example, 0.4
(mm) metal plate is welded at a plurality of points so that the resistance value of the current collecting lead portion (current collecting tab) 18 is 5.0 × 10 ⁻⁶ mΩ (milliohm). Thus, the resistance value is 5.
A nickel-cadmium storage battery was prepared as shown in FIG. 1 using a current collector 16 having a current-collecting lead portion (current-collecting tab) 18 adjusted to 0 × 10 ⁻⁶ mΩ (milliohm). Is a nickel-cadmium storage battery L of Comparative Example 7.

Comparative Example 8 Current collecting lead portion (current collecting tab) 1 as shown in FIG. 1 described above.
8 has the same shape as the current collecting lead portion and has a predetermined thickness (for example, 0.2
A 5 mm) metal plate is welded at a plurality of points to adjust the resistance value of the current collecting lead portion (current collecting tab) 18 to be 7.7 × 10 ⁻⁶ mΩ (milliohm). As shown in FIG. 1, a nickel-cadmium storage battery is used by using a current collector 16 having a current collecting lead portion (current collecting tab) 18 whose resistance value is adjusted to 7.7 × 10 ⁻⁶ mΩ (milliohm). The prepared nickel-cadmium storage battery is referred to as a nickel-cadmium storage battery M of Comparative Example 8.

The temperature and the battery capacity of the sealing body 17 of the nickel-cadmium storage battery having the SC size of I, J, K, L and M and the nominal capacity of 1300 mA were measured as follows. That is, 60C (78000) in an atmosphere of 25 ° C.
After charging for 1 minute with a charging current of 1 mA (mA), and after resting for 1 hour, discharging with a discharging current of 1 C (1300 mA) in an atmosphere of 25 ° C., the temperature of the sealing body 17 during charging is measured. When calculating the battery capacity from the discharge time,
The results are shown in Table 2 below and FIGS. 3 and 4. The battery capacities shown in Table 2 and FIGS. 3 and 4 are 100 when the current collecting lead plate (current collecting tab) 18 having a resistance value of 7.7 mΩ (milliohm) which has been conventionally used is used.
(%).

[0038]

[Table 2]

As is clear from the results of Table 2 and FIGS. 3 and 4, in the ultra-fast charging such that the charging rate is 60 C, the current collecting lead portion (collecting current) of 7.7 mΩ (milliohm) of Comparative Example 8 is collected. It can be seen that in the nickel-cadmium storage battery M using the current collector 16 having the charging tab 18, the temperature rise of the sealing body 17, that is, the temperature rise inside the battery is large, and the battery capacity is lowered.

On the other hand, the nickel-cadmium storage battery I (collector lead portion (collector tab) 1 of Examples 3 to 5 according to the present invention.
8 has a resistance value of 1.3 × 10 ^-6 mΩ), J (current collecting lead portion (current collecting tab) 18 has a resistance value of 2.6 × 10 ^-6 mΩ)
No.) and K (the resistance value of the current collecting lead portion (current collecting tab) 18 is 3.8 × 10 ⁻⁶ mΩ), the resistance value of the current collecting lead portion (current collecting tab) 18 decreases. Thus, it is understood that the temperature rise of the sealing body 17, that is, the temperature rise inside the battery is small, and the battery capacity thereof is also increased. It can be considered that this is because the amount of heat generated in the current collecting lead portion (current collecting tab) 18 is reduced, and the battery capacity is increased by the amount that energy is not consumed there.

Therefore, the current collecting lead portion (current collecting tab)
The resistance value at 18 is preferably 4 × 10 ⁻⁶ mΩ or less. As described above, when the resistance value of the current collecting lead portion (current collecting tab) 18 is set to 4 × 10 ⁻⁶ mΩ or less, heat generation in the current collecting lead portion (current collecting tab) 18 can be suppressed. As a result, it is possible to prevent the surrounding resin parts from melting due to heat generation, and it is possible to prevent an internal short circuit of the battery due to the melting of the resin parts. Further, by preventing heat generation, energy loss can be reduced and battery capacity can be improved.

The resistance value R (mΩ) of the current collecting lead portion (current collecting tab) 18 was obtained by the following equation (1).

[0043]

## EQU1 ## R (mΩ) = ρL / A ... (1) where L is the length (c of the current collecting lead portion (current collecting tab) 18
m), and A represents a cross-sectional area (cm ² ) of the current collecting lead portion (current collecting tab) 18. Further, ρ represents the resistivity, and iron (F
In the case of e), ρ = 9.71 × 10 ⁻⁶ mΩ · cm.

As described above, in the nickel-cadmium storage battery of the present invention, by reducing the internal resistance of the battery from both the nickel positive electrode plate and the current collecting lead portion, the chargeability is improved and the battery capacity is improved. . Further, since the heat generation of the battery is suppressed, it is possible to obtain a special effect in terms of safety such as suppressing the occurrence of a short circuit inside the battery.

The nickel-cadmium storage battery of the present invention is effective in various charging methods such as constant current charging, constant voltage charging, stepwise charging, and pulse charging when performing ultra-rapid charging with a charging time of 3 minutes or less. there were.

In the above embodiment, an example in which the thickness of the current collecting lead portion (current collecting tab) 18 is increased has been described as a method of reducing the resistance value of the current collecting lead portion (current collecting tab) 18. , Shorten the distance between the current collecting lead part (current collecting tab) 18 and the sealing body 17, or use a conductive material such as aluminum (Al) or copper (Cu) for the current collecting lead part (current collecting tab) 18. It is also possible to reduce the resistance value of the current collecting lead portion (current collecting tab) 18 by using a metal having good conductivity.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view schematically showing a nickel-cadmium storage battery of the present invention.

FIG. 2 is a diagram showing a relationship of battery capacity with respect to a positive electrode plate area per positive electrode plate capacity when charging is performed at a charge rate of 60C.

FIG. 3 is a diagram showing a relationship between a resistance value of a current collecting lead plate (current collecting tab) and a temperature rise of a sealing body when charging is performed at a charge rate of 60C.

FIG. 4 is a diagram showing the relationship between the resistance value of the current collecting lead plate (current collecting tab) and the battery capacity when the battery is charged at a charge rate of 60C.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Metal outer can, 11 ... Cadmium negative electrode, 11a ... Negative electrode end part, 12 ... Nickel positive electrode, 12a ... Positive electrode end part, 13
... Separator, 14 ... Spiral electrode body, 15 ... Negative electrode current collector plate, 16 ... Positive electrode current collector plate, 17 ... Sealing body, 17a ... Sealing body bottom part, 18 ... Positive electrode current collecting lead, 19 ... Sealing gasket

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01M 4/24 H01M 2/26 H01M 10/24

Claims (4)

(57) [Claims] 1. A positive electrode plate and negative electrode plate is accommodated in a battery container which stored the alkaline electrolyte is opposed via a separator same
A sealed alkaline storage battery in which a battery container is sealed , wherein the area of one surface of the positive electrode plate is 70 to 1 with respect to the positive electrode plate capacity.
A sealed alkaline storage battery characterized in that it is regulated to 10 cm ² / Ah. 2. A positive electrode current collector and a positive electrode end welded to the positive electrode plate.
The resistance value of the current collector tab that connects the sealing body that also functions as a child is 4 x 1
0 ^-6, characterized in that the mΩ or less according to claim 1
Sealed alkaline storage battery. 3. The current collecting tab is integrally formed with the positive electrode current collector.
Form, and welding the current collector formed as a separate body in the current collector, sealed alkaline storage battery according to claim 2, characterized in that the resistance value 4 × 10 ^-6 milliohms or less. 4. The current collecting tab having a resistance value of 4 × 10 ⁻⁶ mΩ or less is nickel-plated iron or aluminum,
3. A copper alloy selected from copper.
The sealed alkaline storage battery described in 3 .