JPS59117073A - Plate-like battery - Google Patents

Abstract

PURPOSE:To prevent any expansion of the package of a plate-like battery as well as any change in the internal resistance of the battery which might be caused due to external pressure by arranging several unit cells each consisting of a positive chamber, a separator and a negative chamber in flat form and compactly packing these unit cells independently by means of plastic films. CONSTITUTION:After a positive current collector 20 is installed on a battery base member 10 which can not be impregnated with moisture, plural zones 20' for unit cells are provided in parallel and a lead part 20'' is formed. Next a positive active material 30 is brought into close contact with areas of the current collector 20 corresponding to the zones 20' by pressure. Then a separator 40 having the same width as the base member 10 is installed over the positive active material 30 before negative active material and current collector 31 and 21 are installed over the positive active material 30. Next the peripheries 70 of the thus formed body are heated from its both surfaces to fuse the base member 10, the separator 40 and the exterior base member 11. After that electrolyte is poured from a portion 60 to impregnate the body before the portion 60 is completely sealed. Owing to the above constitution, a thin flexible battery which has no possibility of being expanded even if its surface area is increased and in which no breakage and leakage are caused by its curving or vibration can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat battery that is thin and can be made to have a large area.

In recent years, as watches, calculators, cameras, toys, etc. have become more electronic, and electronic devices such as radios, tape recorders, and videos have become smaller, batteries have become smaller and thinner. is now on the market. Among them, flat batteries packaged in plastic are more flexible than button batteries made of metal cans, and have various advantages such as being larger in area and easier to manufacture into arbitrary shapes. However, on the other hand, because flat batteries packaged in plastic are flexible, they also have the disadvantage that the packaging can easily swell due to internal gas generation, resulting in poor contact between the current collector or separator and the live material. There is. In addition, the internal resistance is susceptible to change due to external pressure (and it is impossible to seal the contact area between the metal terminal and the plastic because it is impossible to seal with mechanical force (so-called 1 crimping), as is done with button-type batteries). These defects are so serious that they can be said to be fatal in terms of battery performance, and have been a factor that has hindered the development of Blastinok-packaged flat batteries.

In the present invention, in order to improve these points, several small unit independent unit cells consisting of a positive electrode chamber/separator/negative electrode chamber are arranged in a flat shape and each is individually and compactly packaged with a plastic film. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in detail below with reference to the drawings, with the aim of overcoming these drawbacks.

In FIG. 1, the battery substrate (10) is a moisture permeable and electrically insulating plastic film. A positive electrode current collector (20) is placed on this film. This current collector (20) has a plurality of sections (2 (11') arranged in parallel with a section (50) in between, which becomes a unit battery, and a lead section 1
20Y' is formed. Next, active materials (30) are placed on the current collector (20) at positions corresponding to the areas (2υ)' that will become unit cells (see FIG. 2 below).

Pressure is applied from this soil removal to move the active material (30) to the current collector (2).
0) K to make intimate contact with the top.

Next, a separator (40) of the same size as the base material (101) is installed on top of this [-1] A negative electrode active material (31) is placed directly above the positive electrode active material (30). and the negative electrode current collector (21).The IJ-domain of the negative electrode current collector Qυ (2ff' is formed on the opposite side from the positive electrode lead (20fl) as shown by the broken line in Figure 1). If the current collector also serves as an active material, there is no special need to install the active material. Remove the comb-shaped gap part (50) and one part (60) (periphery (
70) from both sides to form a battery base material (101/separator (40)/exterior base material (2I)) as shown in Figure 3.
fuse.

(If the separator is not heat-sealable, apply adhesive to this part (50) of the separator in advance). As a result, several small unit cells are formed in a flat line. This element is true.

The battery base material (10) uses one type of industrial plastic such as polyvinyl chloride, ABS resin, polyamide, polyester, polypropylene, polycarbonate, etc., or a composite sheet made by laminating them with aluminum foil or the like.

The metal for the current collector should be selected in combination with the active material used. For example, sheets or wires of stainless steel, lead, aluminum, titanium, nickel, etc. can be used for the positive electrode current collector, and titanium, nickel, brass, etc. can be used for the negative electrode current collector. In addition, a conductive carbon film made by vapor deposition or the like on a plastic film can also be used as a material for the current collector.

Conventionally proposed active materials can be used. For example, as positive electrode active materials, M1102, H2O
.

pbo2. β-NioHIAr20+AfO+Af/
Cz, Cu, (CF)n, etc. are used, and Li+Mf+At+Zn+Sn+C+Fe+Pb etc. are used as the negative electrode active material.

Nonwoven fabrics made of nylon, polypropylene, polyamide, etc. are used for the separator.

The electrolyte will vary depending on the active material used and the battery being assembled, but conventionally proposed systems can be used.

The punching method is best for forming the metal sheet of the current collector into a comb shape, but an etching method using photoresist Y may also be used.

It will be done.

As described above, the π-based flat battery of the present invention has the following characteristics compared to the conventional flat battery.

■ Dividing the active material into small unit batteries reduces the chance of the Santoy active material scattering or loosening (and provides long-life batteries).

■ Because of the structure described in (2), there is no need to worry about ``blistering'' even when the area is increased (therefore, there is no need to worry about poor contact between the current collector or senolator and the active material).

■ As described in ■ (-Due to the negative structure, high utilization efficiency of active material and high output can be obtained.

■ Because of the structure described in ■, it is possible to make multiple positive and negative sets of unit batteries on the same plane, so by connecting these unit batteries in series, the battery height can be increased without increasing the thickness of the battery. You can make voltage batteries.

In this way, the battery of the present invention can be made into a flexible @cell by using a plastic film as a battery base material, and it is also possible to form a unit cell divided into stripes + a larger area than C. It has extremely excellent practical performance as a thin flexible battery that does not break or leak even when subjected to bending and vibration.

<Example> PVC film (0.2 trahl thickness) as a base material
0x30mm! A comb-shaped stainless steel electrode (thickness: 003) as shown in Figure 1 was placed on the L cutout, and the active material for the positive electrode (manganese dioxide and acetylene black) was added to the electrolyte (~65%) on the current collector. KO) () (made into a paste) was installed by screen printing, and then a non-woven fabric (manufactured by Nippon Pine Co., Ltd., product 1; F
T-210) and stack it on top of it in the same position as the lower positive electrode current collector (however, the terminal lead part should be on the opposite side as shown in Figure 1). Install a comb-shaped zinc film (0.08 m + n thickness) as shown. Layer a PVC film (02 thickness) on top of it, and place a comb-shaped zinc film (0.08 m + n thickness) on top of it. ) and the periphery (Fig. 1 (70)
) is adhered using Adhesive 1 (trade name: Cemedine EP-330, manufactured by Cemedine Co., Ltd.) 2. After gluing is completed,
7- Inject the electrolyte into the part that is not covered (Fig. 1 (60)'), and then glue that part with adhesive (see Figure 1 (60)').
- completed the battery.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and are Fig. 1 (also a plan view in which a positive electrode current collector is installed on a battery base material (the negative electrode current collector is indicated by a broken line), and Fig. 2). (・A cross-sectional view showing state 7 before heat fusion during assembly, and a cross-sectional view of the completed flat battery in Figure 5. 001...Battery base material (111...Base material for exterior) Oi...Current collector for positive electrode t201'・Part that becomes unit battery (support)''...Lead part (2I)...
・Current collector for negative electrode (30)...Active material for positive electrode (31
)... Active material for negative electrode (40)... Nanakurator -
(50)...Part 1 (70)...Written amendment to peripheral proceedings) 1. Display of the case 1982 Patent Application No. 227996 2 Name of the invention Flat battery 3.2 Relationship with the case Patent applicant address 1-5-1 Taito, Taito-ku, Tokyo Name (3
19) Toppan Printing Co., Ltd. 5. Contents of the amendment a) The detailed description of the invention column in the specification is amended as follows. a) Page 4, line 9 “Substrate (21) J [Substrate (11)
Correct it with J. b) Correct rcu, J on page 5, line 12 to rcu o, J. C) Correct "C9" on page 5, line 13 to rCd,J. d) On page 5, line 16, "of polyamide, etc." is corrected to "1 of polyamide, etc." Procedure Neyama Masaaki February 22, 1980 To the Commissioner of the Japan Patent Office 1982 Waiting ♂ [Application No. 227996 2, Name of invention Flat battery 3, Relationship with the person making the amendment case Patent applicant address Tokyo 1-5-1 Taito, Taito-ku Name <3
19) “Claims” after amendment by Toppan Printing Co., Ltd. Battery.

Claims (1)

[Claims] 1) A positive electrode current collector, an active material, etc. are placed at intervals above the battery base layer made of plastic film, and a separator made of nonwoven fabric is placed on top of this, and a separator that corresponds to the positive electrode current collector is placed on top of that. An active material for a negative electrode and a current collector are placed thereon, an exterior base material made of a plastic film is placed thereon, the active material etc. are impregnated with an electrolytic solution, and the above-mentioned intervals are sealed. battery.