JPH05151976A - Film battery - Google Patents

Abstract

PURPOSE:To provide a safe film battery with long lifetime and excellent energy effeciency by reducing the internal resistance. CONSTITUTION:A film battery includes a laminate A and a frame 7. In the laminate A a positive electrode plate 3 and a negative electrode plate 4 are placed one over another between a positive electrode terminal plate 1 and a negative electrode terminal plate 2. The frame 7 accommodates the laminate A and therein a low pressure gas is encapsulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat plate battery, and more particularly to a battery structure in which electrode plates are laminated inside the battery in order to improve the battery capacity of the thin film battery.

[0002]

2. Description of the Related Art Batteries to be attached to card-shaped devices are required to be thin, have high energy density, be simple and have high reliability. In such a thin battery, even if a plurality of thin batteries are stacked, the energy density cannot be increased. There was also a problem that the thickness was increased. Even if the battery is too thin, it may be difficult to mount and fix it on an application product such as a device or a toy in which the battery is used. On the other hand, since it was too thin, the electrical contact between the electrodes deteriorated, and the battery sometimes swelled due to the influence of moisture. Further, 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 in order to increase the capacity. Also for their electrical connection, it is necessary to connect the lead plates to each terminal plate of the battery in advance, and then reconnect them outside the battery.For connection such as spot welding, the terminal plate should be penetrated. There was also a problem in terms of airtightness such as a hole. Further, since it is too thin, the electrical contact between the electrodes deteriorates, and there is a problem in confirming the airtightness.

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

[0005]

In order to solve the above problems, the present invention provides a film battery having a laminate A and a frame 7 as described in the claims, wherein the laminate A Is a positive electrode plate 3 and a negative electrode plate 4 laminated between a positive electrode terminal plate 1 and a negative electrode terminal plate 2, and the frame body 7 accommodates the laminated body A therein, 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 laminated body A. Further, the pressure of the low-pressure gas is 0.1 Torr to 65.
It is preferably Torr. Further, the low-pressure gas is preferably inert gas, dry air, or a mixed gas thereof. Further, the positive electrode terminal plate 1, the negative electrode terminal plate 2, the positive electrode plate 3 and the negative electrode plate 4,
The ears 1a, 2a, 3a, 4a may be provided, and the ears 1a and 3a, 2a and 4a having the same polarity may be laminated and integrally crimped at the terminals 8 and 9 of the frame body 7. Furthermore, when a plurality of batteries are stacked and used, the height H of the battery side surface is preferably larger than the height h of the central portion.

[0006]

[Operation] By enclosing low-pressure gas in the battery, good electrical contact between the electrode plates can be achieved. Further, by setting 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 using argon gas, helium gas or dry air or a mixed gas of these gases,
The above reaction can be 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 body 7
When the stack A is pressed with 0, the internal resistance of the battery can be lowered. Further, the ears 1a and 3a, 2a and 4a having the same polarity of the terminal plates 1 and 2 and the electrode plates 3 and 4 are stacked to form a frame 7
By integrally crimping the terminals 8 and 9, the connection between the laminated body A and the terminals 8 and 9 can be strengthened. Further, when the height H of the side surface is set to be 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 batteries rises, the upper lid 11 and the lower lid 10 Can easily puff.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a laminated body in which two pairs of positive electrode plates and negative electrode plates are laminated 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 comprising manganese dioxide, scaly graphite, a binder, an additive and the like is coated on the upper surface of a 0 μm thick stainless steel foil to a thickness of about 50 μm, 2 is 1
A negative electrode terminal plate in which a negative electrode active material 6 made of metallic lithium is coated on the lower surface of a 0 μm thick stainless steel foil to a thickness of about 30 μm, 3
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.

The terminal plates 1 and 2 and the electrode plates 3 and 4 are provided with ears 1a, 2a, 3a and 4a, respectively, and the ears are not covered with the active materials 5 and 6. Then, as shown in FIG. 1, the positive electrode plate 3 and the negative electrode plate 4 are alternately laminated so that the positive electrode terminal plate 1 and the negative electrode terminal plate 2 have overlapping ears of the same polarity to form a laminated body A. The surface of the positive electrode active material 5 is coated with an electrolyte having a thickness of about 20 μm, which is omitted in FIG.

FIG. 2 is a perspective view of the frame body for accommodating the laminated body A, excluding the upper lid, and FIG. 3 is an enlarged top view of the main part thereof. 7 is a frame body excluding the upper lid 11, and the positive electrode terminal 8 is provided on one side.
And a negative electrode terminal 9 are provided, and are integrally formed with the lower lid 10. Both the positive electrode terminal 8 and the negative electrode terminal 9 have caulking portions 8a and 9a inside the frame body 7 as shown in FIG. 3, and the positive electrode terminal 8 projects and the negative electrode terminal 9 is recessed outside the frame body 7.

When the laminated body A of FIG. 1 is housed in the frame body 7, the positive electrode ears 1a and 3a are crimped by the crimping portion 8a, and the negative electrode ears 2a and 4a are crimped by the crimping portion 9a, respectively. The terminal plate of the same polarity and the electrode plate are connected. After that, the pressure is reduced in an atmosphere of helium gas, the upper lid 11 is attached, and the frame 7
The inside of was sealed to produce a film battery. A cross-sectional view of the main part of this battery is shown in FIG.

As shown in FIG. 4, the upper lid 11 and the lower lid 10 of the frame body 7 have a thickness of 1 mm or less and are internally depressurized to move up and down, so that the electrode plates 3 and 4 can be pressed. Desirable for lowering internal resistance. Further, 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 created between the batteries, and the upper lid 11 and the lower lid 10 are separated even if the internal pressure increases. You can easily puff. 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, if the solvent in the positive electrode active material is volatilized by a high vacuum to change the quality of the positive electrode active material, or if the negative electrode active material reacts with the water in the air to change quality, 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 shelf life were investigated. The results are shown in Table 1. The resistance was measured with a simulated battery having the same thickness.

[0013]

[Table 1]

As can be seen from Table 1, when the degree of reduced pressure in the battery is in the range of 0.1 Torr to 65 Torr, there is no alteration of the active material and it is found that 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, it is easy to handle and easy to install in a device. (3) According to the configuration of claim 2, the internal resistance is reduced,
The life can be extended. (4) When the pressure of the low-pressure gas is within the range defined in claim 3, the battery life is remarkably extended. (5) If the gas according to claim 3 is used, the airtightness inspection of the battery can be facilitated and the battery life can be extended. (6) According to the configuration of the fifth aspect, it is possible to provide a film battery in which the connection of the terminal portions is strong and which is not easily damaged. (7) According to the configuration of claim 6, when a plurality of the batteries are 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 battery internal pressure is reduced. Even if it rises, the upper lid 11 and the lower lid 10 function as a movable plate and do not damage the battery.

[Brief description of 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.

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 body 8 Positive electrode terminal 9 Negative electrode terminal 10 Lower lid 11 Upper lid A Layered body H Side surface height h Center part height It

Claims (6)

[Claims] 1. A film battery comprising 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 body (7) houses the laminated body (A) therein,
A film battery characterized by being filled with low-pressure gas. 2. The frame body (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 the film battery comprises: 3. The low-pressure gas according to claim 1, is 0.1To.
A film battery which is a gas of rr to 65 Torr. 4. The film battery according to claim 1, wherein the gas is argon gas, helium gas, dry air, or a mixed gas thereof. 5. 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 having the same polarity (1a and 3a, 2a and 4a) are stacked and integrally crimped by the terminals (8, 9) of the frame body (7). Film battery. 6. The height (H) of the side surface is the height (h) of the central portion.
The film battery according to claim 1, wherein the film battery is larger.