JPS58212074A - Manufacturing method of flat cell - Google Patents

Abstract

PURPOSE:To prevent an electrolyte from seeping into a sheathing member even when a final sealing of the sheathing member takes place under decompression, by certainly impregnating and holding a high viscosity, organic electrolyte in a flat generating element covered by a multilayer resin film-make sheathing member, especially in a separator member composed of a nonwoven fabric of polypropylene. CONSTITUTION:The figure 1 in illustration is of a sheathing member having a heat fusing resin film in its innermost inside, consisting of a multilayer resin film inclusive of those of polyester film, aluminum foil, heat fusing resins, etc. A positive pole body 2 and a negative pole collector body 5 are laminated each at the specified position of the sheathing film 1, and a negative pole lithic film 7 sticks to the negative pole collector body 5 while a separator 8 and a positive pole active material 4 consisting of carbon fluoride as a main component are sandwiched between both films, and three sides 9, 10 and 11 of the sheathing film 1 are sealed up by means of a heat fusing method. Next, an electrolyte filler port 12 is turned upward, and a high viscosity, organic electrolyte consisting of r-butyrolactone as a main component is poured into this port, then a P surface is applied to a jig surface, and a vibration of 300cy/min is given for 40sec long from a Q surface. Afterward,the whole call body is kept in a state of decompression in a vacuum and a final sealing part 12 is sealed up by means of a heat fusing method.

Description

Detailed Description of the Invention (Industrial Application Field) The invention is directed to a flat battery, particularly an organic electrolyte in which an inorganic salt is completely dissolved in a highly viscous organic solvent such as γ-butyrolactone or zolopyrene carbonate. The present invention relates to a method of manufacturing a battery in which a nonwoven polypropylene fabric is used as the isolation member interposed between the positive and negative electrodes, and a flat power generating element is covered with a jacket member made of a multilayer resin film.

(Prior art) Up to this iL, the upper electrode active material contains carbon dioxide, manganese oxide, etc., the negative electrode active material contains an active light metal such as lithium, and the separator or separator that isolates the two negative electrodes. A polyzoropylene non-woven material is used as an isolation member as an electrolyte impregnated material, and lithium bosonide and perchlorine are used as an organic solvent with a high dielectric constant and excellent conductivity such as T-J-roft/or propylene carbonate. In so-called organic M1'<'i, IIL ponds, which use an organic electrolyte containing an inorganic salt such as lithium oxide, the electrolyte generally has a high viscosity, and the force ζ
1. Due to the poor compatibility and degree of immersion into the isolation member, 1.
2-Dimethoxy7jotan (hereinafter referred to as DME), 1.3-
By adding a low viscosity solvent such as dioxolane (hereinafter referred to as DO) or tetrahydrofuran (hereinafter referred to as THF), the liquid is dried and transferred to the isolation member without reducing the conductivity of the liquid. The degree of affinity electrolyte impregnation was increased.

However, among such organic electrolyte batteries, the power generating element is flattened, and its outer panel is mainly made of polyester film, etc., and a part of the intermediate part is made of aluminum foil, which is a gas- and liquid-impermeable member. A dense trigram using a multi-layer resin film with .

+For batteries, D added to reduce the viscosity of the electrolyte
There is a problem in that low viscosity solvents such as MIC dissolve or corrode the resin film of the outer sheathing member and have an adverse effect.

Therefore, although the affinity of the electrolytic solution to the isolation member and the degree of immersion are poor, the isolation member is impregnated with the organic electrolyte that is sold out. However, since the isolation member is not fully impregnated with the electrolyte, when the final sealing of the outer cover member is performed under completely evacuated pressure, the free electrolyte inside the battery is drawn out from the sealing part and the battery is removed. There were drawbacks that degraded performance.

(Purpose) The present invention aims to securely transport a high viscosity organic electrolyte to a flat power generation element covered with an exterior member made of a multilayer resin film, immediately to an isolation member made of a polypropylene non-woven fabric, and then to an outer covering member. Final sealing with reduced pressure of -1゛? 1, the electrolyte was poured outside the sheathing member (tH = 113 μH + 1.).

In other words, in the present invention, a highly viscous organic l1Llf is applied to a flat power generating element covered with an exterior opening made of a multilayer resin film.
After applying the liquid to the power generation element, vibrate or i41
The affinity of the electrolyte to the polyzorobire/non-woven fabric is changed by blowing the horn 11, and the position of the gas and liquid is changed.

(Example) 1. The details of the present invention will be explained below with reference to Examples.

r) % Figure 1 is a plan view of the ``peno'' shaped battery in this specification, and Figure 2 is a sectional view taken along the ``g'' line. In the figure, 1 is a polyester film 4) Rem, aluminum'/lXI + heat-adhesive resin film 4) A multilayer resin film such as a 5-layered resin film 4) and 5 is a heat-adhesive material 1 [fi] on the inner surface of the eel.
This is an exterior member with zero frem. This exterior finish) Leno,
Inside 1, a flat atom is stored.

2p; i Aluminum 2 laminated to exterior film 1
A part of it is on display. Reference numeral 4 denotes a positive electrode in which the positive electrode current collector 2 is made entirely of fluorinated carbon with thread waste. 5 is a negative electrode collector made of a nickel plate laminated to the exterior film 1; 6 is a negative electrode terminal window provided in the same manner as the positive electrode f'3, and faces a part of the negative electrode current collector 5; 7 is negative electrode Toden 5
This is a negative electrode active material consisting of a metal lithium plate in close contact with the lithium metal.

Reference numeral 8 denotes a separator made of a polypropylene nonwoven fabric provided between the positive electrode active material 4 and the negative electrode active material 7, and also serves as an electrolyte impregnated material (electrolyte impregnated material).

In manufacturing this battery, the positive electrode current collector 2 and the negative electrode current collector 6 are respectively laminated on the exterior film 1019B at fixed positions, the negative electrode lithium 7 is attached to the negative electrode box 5, and a separator is placed between both films. 8 and a positive electrode active material 4 whose main components are carbon fluoride are sandwiched and sealed by heat fusion on two sides of the exterior film 1 at 9° 10.11'f as shown in FIG. Next is the electrolyte impregnated material (also the final sealing part)
Similarly to 12i'-, a highly viscous electrolyte containing γ-butyrolactone as a main component is injected. After injecting the tunka solution,
Stick to P and apply it to the 11L side, then shake J for 300 cycles from the 9th side for 7 minutes. Apply JIk for 40 seconds. Thereafter, the entire battery is kept in a reduced pressure state in an Ir sealing device, and a portion of the battery in this state is sealed by heat sealing at the final sealing part 12.

・1. An example of how to apply vibration is described above, but vibration J
') In terms of L, vibration with a cycle may be sufficient, and 'vibration or shock C that occurs once per second is also acceptable.' By repeating several dozen times or more,
The electrode'p14 solution is well impregnated.

(Su J Ka) To Q Ming uses high viscosity γ-butyrolactone as the main IA:
In order to improve the compatibility with polypropylene/non-woven fabric and the isolation member, the isolation member is coated with DMIC in advance without mixing a low viscosity solvent such as DME into the electrolyte solution. etc. Najima IJ thing fx<
, the battery can be easily impregnated with an electrolytic solution to heat the battery.

- By using highly volatile materials such as DME, the composition of the V electrolyte changes during the battery assembly process, resulting in a heavy oil with a non-uniform solution composition. This can be prevented by not having a gold coincidence.

Furthermore, low viscosity solvents such as DME are highly flammable, so removing them can help prevent fires or improve the working environment.

In addition, low-viscosity solvents such as DME can melt or corrode the heat-fusible resin film of the exterior component (there are times when the sealing strength may decrease or the sealing strength may be incomplete when used for a multilayer resin film metal exterior component). There was some closure, but DM
By applying vibration or shock without using any low-viscosity solvent such as E, the 11L solution with a drying level can be directly impregnated into the isolation member, and the electrolysis can be carried out at the final sealing date. Battery performance can be improved without the liquid leaking t1 out of the jacket member.

[Brief explanation of the drawing]

Fig. 1 is a top view of a flat J$ pond according to the present invention, Fig. 2 is a sectional view taken along the line n-n' in Fig. FIG. 1...Outer cover member made of multilayer resin film, 2.
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...Negative electrode current collector, 7...Negative electrode, 8...
Isolation of polyzorohylene nonwoven fabric, rubber material. Attorney Takena Toshio Nakao and 1 other person 1゛1 i! 111VI Figure 12 Procedural Amendment 1 Indication of Case 1981 Application for Permission No. 95318 s22 Name of Invention Method of Manufacturing Flat Batteries 3 N 117 Pressure Sound]・A'1 and () 1 Dō 11
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Contents of F (1) Correct the claims section of the specification as shown in the attached sheet. +21 In the same page, page 4, lines 9 to 10, 1. ``It is characterized by impregnation with an electrolytic solution'' is corrected to ``characterized by a step of impregnating with an electrolytic solution.'' A flat power generation element using polypropylene non-woven fabric as an isolation member is covered with a jacket member made of a multilayer resin film, and after injecting a high viscosity organic di solution into the power generation element, the jacket member covers the A method for manufacturing a battery in which a power generation element is sealed, the flat battery comprising the step of injecting an organic electrolyte having the surface precision into the power generation element and applying vibration or impact to the power generation element to impregnate the isolation member with the electrolyte. manufacturing method,

Claims (1)

[Claims] A flat power generation element using polypropylene non-woven fabric as an isolation member is covered with a jacket member made of a multilayer resin film, and after a high viscosity organic electrolyte is injected into the power generation element, the power generation element is sealed by the jacket member. A method of manufacturing a flat battery comprising injecting the high viscosity organic electrolyte into a power generation element and applying vibration or impact to the power generation element to impregnate the isolation member with the electrolyte.