JP3166254B2 - Film 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 battery structure in which respective plates are laminated inside a battery to improve the battery capacity of a flat battery, particularly a thin film battery.

[0002]

2. Description of the Related Art A battery mounted on a card-shaped device is required to have a small thickness and a high energy density, and to be simple and reliable. In such a thin battery, the energy density could not be increased even if a plurality of thin batteries were stacked. In addition, there is a problem that the thickness is increased. Even if the battery is too thin, it may be difficult to attach and fix the battery to a use product such as a device or a toy. On the other hand, when the electrodes were too thin, the electrical contact between the electrodes became poor, and the batteries sometimes swelled due to the influence of moisture. Furthermore, after producing the battery, it may be difficult to check the airtightness of the battery.

[0003]

Since the conventional film battery described above is composed of a single positive electrode terminal plate and a single negative electrode terminal plate, it is necessary to connect a plurality of sheets in parallel to increase the capacity. Also, for their electrical connection, it is necessary to connect the lead plate to each terminal plate of the battery in advance, and then connect them again outside the battery. There was also a problem in terms of airtightness, such as holes. In addition, since it is too thin, electrical contact between each electrode is deteriorated, and there is a problem in confirming airtightness.

That is, there have been problems in terms of battery thickness, internal resistance, energy efficiency, connection between batteries, airtightness, mountability to equipment, manufacturability, and quality assurance.

[0005]

In order to solve the above-mentioned problems, the present invention provides a film battery having a laminate A and a frame 7 as described in claims. Has a structure in which a positive electrode plate 3 and a negative electrode plate 4 are laminated between a positive electrode terminal plate 1 and a negative electrode terminal plate 2, and the frame 7 accommodates the laminated body A therein, and a low-pressure gas is It is characterized by being enclosed. The frame 7 preferably has an upper lid 11 and a lower lid 10, and the upper lid 11 and the lower lid 10 preferably press the laminate A. Further, the pressure of the low-pressure gas is 0.1 Torr to 65 Torr.
Torr is desirable. Further, it is preferable that the low-pressure gas is an inert gas, dry air, or a mixed gas thereof. The positive electrode terminal plate 1, the negative electrode terminal plate 2, the positive electrode plate 3, and the negative electrode plate 4
Ears 1a, 2a, 3a, and 4a may be provided, and ears 1a and 3a, 2a, and 4a of the same polarity may be stacked and crimped integrally by terminals 8, 9 of the frame 7. Furthermore, when a plurality of batteries are stacked and used, it is preferable that the height H of the battery side surface is larger than the height h of the central portion.

[0006]

[Operation] By filling a low-pressure gas in the battery, the electrical contact between the electrode plates can be improved. Further, by controlling the pressure of the gas to 0.1 Torr to 65 Torr, the amount of water in the battery is regulated, the reaction between water in the air and the negative electrode active material is suppressed, and the volatilization of the solvent of the positive electrode active material is prevented. be able to. Further, by making the gas an argon gas, a helium gas, a dry air or a mixed gas thereof,
The above reaction is further suppressed, and the airtightness when the battery is sealed can be easily determined. Further, the upper lid 11 and the lower lid 1 of the frame 7 are
When the laminate A is pressed with 0, the internal resistance of the battery can be reduced. Further, the same polarity ear portions 1a and 3a, 2a and 4a of the terminal plates 1 and 2 and the electrode plates 3 and 4 are stacked, and the frame body 7 is formed.
By crimping integrally with the terminals 8 and 9, the connection between the laminate A and the terminals 8 and 9 can be strengthened. If the height H of the side surface is larger than the height h of the central portion, a gap is formed in the central portion between the batteries when a plurality of batteries are stacked, and when the pressure inside the battery rises, the upper lid 11 and the lower lid 10 are stacked. But can easily bounce.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a laminate in which two pairs of a positive electrode plate and a negative electrode plate are stacked between a positive electrode terminal plate and a negative electrode terminal plate.
A positive electrode terminal plate in which a positive electrode active material 5 composed of manganese dioxide, flaky graphite, a binder, an additive, and the like is coated on the upper surface of a 0-μm-thick stainless steel foil with a thickness of about 50 μm,
A negative electrode terminal plate in which a lower surface of a stainless steel foil having a thickness of 0 μm is coated with a negative electrode active material 6 made of metallic lithium to a thickness of about 30 μm;
Is a positive electrode plate having both surfaces coated with the positive electrode active material 5, and 4 is a negative electrode plate having both surfaces coated with the negative electrode active material 6.

[0008] Ears 1a, 2a, 3a, 4a are formed on the terminal plates 1, 2 and the respective electrode plates 3, 4, respectively, and the ears are not covered with the active materials 5, 6. Then, as shown in FIG. 1, the positive electrode plate 3 and the negative electrode plate 4 are alternately laminated so that the lugs of the same polarity overlap between the positive electrode terminal plate 1 and the negative electrode terminal plate 2 to form a laminate A. The surface of the positive electrode active material 5 is coated with an electrolyte having a thickness of about 20 μm, but is omitted in FIG.

FIG. 2 is a perspective view of the frame body for accommodating the laminated body A without the upper lid, and FIG. 3 is an enlarged top view of a main part thereof. Reference numeral 7 denotes a frame excluding the upper lid 11, and a positive electrode terminal 8 is provided on one side surface.
And a negative electrode terminal 9 are formed integrally with the lower lid 10. The positive electrode terminal 8 and the negative electrode terminal 9 both have caulked portions 8a and 9a inside the frame 7 as shown in FIG. 3, and the positive terminal 8 protrudes outside the frame 7 and the negative electrode terminal 9 is concave.

When the laminate A of FIG. 1 is stored in the frame 7, the lugs 1a and 3a of the positive electrode are caulked by the caulking portion 8a, and the lugs 2a and 4a of the negative electrode are caulked by the caulking portion 9a. A terminal plate and a polar plate having the same polarity are connected. Thereafter, the pressure was reduced in an atmosphere of helium gas, the upper lid 11 was attached, and the frame 7 was
Was sealed to produce a film battery. FIG. 4 shows a cross-sectional view of a main part of this battery.

As shown in FIG. 4, the upper lid 11 and the lower lid 10 of the frame 7 have a thickness of 1 mm or less, and the inside thereof is decompressed and can move up and down. It is desirable for lowering the internal resistance. When the height H of the side surface is larger than the height h of the central portion, when a plurality of batteries are stacked, a gap is formed between the batteries, and even when the internal pressure increases, the upper lid 11 and the lower lid 10 are separated. Can easily bounce. The helium gas may be argon gas, dry air, or a mixed gas thereof. The airtightness of the battery can be determined from the leak amount of these gases.

Next, when the solvent in the positive electrode active material is volatilized by the high vacuum to change the quality of the positive electrode active material, or when the negative electrode active material changes in quality by reacting with moisture in the air, the battery performance deteriorates. Whether or not the active material deteriorates depending on the degree of internal pressure reduction, the internal resistance of the battery at that time, and the standing life were investigated. Table 1 shows the results. The resistance was measured by using a simulated battery having the same thickness.

[0013]

[Table 1]

As can be seen from Table 1, when the degree of pressure reduction in the battery is in the range of 0.1 Torr to 65 Torr, there is no change in the active material and the battery performance is not affected.

[0015]

As described above, the present invention has the following effects. (1) The life of the battery can be extended by enclosing the low-pressure gas inside the battery. (2) Since a large-capacity battery can be obtained without using a plurality of batteries, handling becomes easy, and mounting to a device becomes easy. (3) According to the configuration of claim 2, the internal resistance is reduced,
Life can be extended. (4) If the pressure of the low-pressure gas is in the range described in claim 3, the battery life is significantly extended. (5) The use of the gas described in claim 3 makes it easier to inspect the airtightness of the battery and extends the life of the battery. (6) According to the configuration of the fifth aspect, the connection of the terminal portion becomes strong, and a film battery which is not easily damaged can be provided. (7) According to the configuration of claim 6, when a plurality of the batteries are further stacked, a gap can be formed between the lower lid 10 of the upper battery and the upper lid 11 of the lower battery, so that the internal pressure of the battery is reduced. Even if it rises, the upper lid 11 and the lower lid 10 function as a movable plate and do not destroy the battery.

[Brief description of the drawings]

FIG. 1 is a schematic view of a laminate according to the present invention.

FIG. 2 is an external perspective view of a frame body excluding an upper lid according to the present invention.

FIG. 3 is a top view of a main part of FIG. 2;

FIG. 4 is a partially cutaway side sectional view of the film battery of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode terminal plate 2 Negative electrode terminal plate 3 Positive electrode plate 4 Negative electrode plate 1a, 2a, 3a, 4a Ear part 7 Frame 8 Positive terminal 9 Negative terminal 10 Lower lid 11 Upper lid A Stacked body H Side height h Central height Sa

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01M 6/06 H01M 6/12 H01M 6/46

Claims (5)

(57) [Claims] 1. A film battery having a laminate (A) and a frame (7), wherein the laminate (A) is provided between a positive electrode terminal plate (1) and a negative electrode terminal plate (2). A positive electrode plate (3) and a negative electrode plate (4) are laminated, and the frame (7) houses the laminate (A) therein,
Argon gas, helium gas or dry air or
A film battery characterized in that these mixed gases are sealed at a gas pressure lower than the atmospheric pressure . 2. The frame (7) has an upper lid (11) and a lower lid (10), and the upper lid (11) and the lower lid (10) press the laminated body (A). The film battery according to claim 1, wherein 3. The film battery according to claim 1, wherein the gas pressure lower than the atmospheric pressure is 0.1 Torr to 65 Torr. 4. The positive electrode terminal plate (1), the negative electrode terminal plate (2), the positive electrode plate (3), and the negative electrode plate (4) have ears (1a, 2a, 3a, 4a). The ears of the same polarity (1a and 3a, 2a and 4a) are laminated, and are caulked integrally at terminals (8, 9) of the frame (7). Film battery. 5. The height (H) of the side surface is equal to the height (h) of the central portion.
The film battery according to claim 1, which is larger.