JP2003077545A - Method of manufacturing nonaqueous electrolyte battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a nonaqueous electrolyte battery for allowing quick impregnation with an electrolytic solution and easy manufacture by bonding a positive electrode 1 to a negative electrode 2 with heating compression after impregnating polymer layers 4 formed on both sides of a separator 3 with the electrolytic solution. SOLUTION: The method comprises a polymer layer forming step of forming the polymer layers 4 on both sides of the separator 3, a generating element fabricating step of fabricating a generating element by laminating the positive electrode, the negative electrode and the separator formed in the polymer layer forming step, a battery fabricating step of fabricating the battery by storing the generating element in the battery case and filling the electrolytic solution in the battery case to be sealed, and a compressing step of cooling the battery after heated and compressing the battery case at least during cooling.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a non-aqueous electrolyte battery such as a polymer battery.

[0002]

2. Description of the Related Art A polymer battery is a non-aqueous electrolyte battery in which positive and negative electrodes are bonded and integrated with a polymer layer impregnated with an electrolytic solution through a separator if necessary. The conventional manufacturing method of this polymer battery is shown below.

In the first manufacturing method, first, a polymer material is dissolved in a solvent and applied on the surfaces of positive and negative electrodes or a separator, and these positive and negative electrodes are laminated or wound via the separator to generate electricity. Create the element. Next, the power generating element is dried to evaporate the solvent to form a polymer layer and bond between the electrodes and the separator. Then, the power generating element is housed in a battery case and an electrolytic solution is injected thereinto to impregnate the polymer layer between the electrodes and the separator with the electrolytic solution to obtain a polymer battery.

In the second manufacturing method, first, a polymer film is arranged between positive and negative electrodes and laminated or wound to manufacture a power generating element. Next, by heating this power generating element, the polymer film is melted to form a polymer layer and the electrodes are bonded together. Then, the power generating element is housed in a battery case and injected with an electrolytic solution to impregnate the polymer layer between the electrodes with the electrolytic solution to obtain a polymer battery. In this case, a separator may be interposed between the electrodes.

Third manufacturing method (Japanese Patent Laid-Open No. 10-25584)
No. 9)), a polymer membrane prepared on the surface of a support and impregnated with an electrolytic solution is arranged between positive and negative electrodes, or an electrolytic solution prepared on the surface of either positive or negative electrode is disclosed. The other electrode is superposed on the impregnated polymer layer, and these are laminated or wound to produce a power generation element. Next, by heating and pressing this power generating element, the polymer film or polymer layer is incompletely melted and the electrodes are bonded to each other and housed in a battery case to form a polymer battery.

[0006]

However, the conventional first
In the manufacturing method (1) and the second manufacturing method (2), the positive and negative electrodes are adhered with a polymer layer and then impregnated with an electrolytic solution, so that wide both sides of the polymer layer have gaps on the surface of the laminated or wound electrode. However, the electrolytic solution can only soak into the edges of the polymer layer exposed between these electrodes. Therefore, it takes a long time for the electrolytic solution to spread to the central portion of the polymer layer and be impregnated into the entire polymer layer.
Since the next process such as pre-charging cannot be performed, there is a problem that the productivity of the battery is deteriorated. That is, for example, in FIG.
As shown in FIG.
When the electrolytic solution is injected after the positive electrode 1 and the negative electrode 2 are adhered by the polymer layer 4 applied on both surfaces of
As shown in, the electrolytic solution can only soak into the edges of the polymer layer 4 exposed between the laminated or wound positive electrode 1 and negative electrode 2. Then, similarly, the active material mixture of the positive electrode 1 and the negative electrode 2 is soaked with the electrolytic solution only from the edge portion.

Further, in the third conventional manufacturing method, a polymer film impregnated with an electrolytic solution is conveyed and placed between electrodes, or impregnated with an electrolytic solution to form a gel. There is a problem in that the operation of transporting the electrode having the polymer layer formed thereon and superimposing it on the other electrode, and stacking or winding these electrodes is not easy, which makes manufacturing difficult. Moreover, there is also a problem that a fixed amount of the electrolytic solution cannot always be injected because the injected amount of the electrolytic solution is determined by the impregnated amount in the polymer layer or the polymer film. Furthermore, since no separator is interposed between the electrodes, there is a problem that an internal short circuit of the battery is likely to occur.

The present invention has been made in order to cope with such a circumstance, in which the electrolytic solution is quickly impregnated by injecting the electrolytic solution and then applying heat and pressure to bond the electrodes with the polymer layer. It is an object of the present invention to provide a method for manufacturing a non-aqueous electrolyte battery that can be easily manufactured.

[0009]

A method for producing a non-aqueous electrolyte battery according to claim 1 comprises a polymer layer forming step of forming a polymer layer on both sides or one side of positive and / or negative electrodes and / or separators. The power generation element manufacturing step of manufacturing a power generation element by stacking or winding the positive electrode, the negative electrode and the separator obtained in the polymer layer forming step, and accommodating the power generation element in a battery case, The method is characterized by including a battery manufacturing process of manufacturing a battery by injecting an electrolyte solution and sealing the battery, and a pressing process of heating the battery and then cooling the battery case to press the battery case at least during cooling.

According to the first aspect of the present invention, in the step of producing the power generation element, the power generation element is laminated and wound with the polymer layer formed only on the surfaces of the electrodes and the separator. A gap is created between the polymer layer. For example, when the polymer layer is formed on both sides of the separator, a gap is created between the polymer layer and the positive and negative electrodes, and even when the polymer layer is formed on both sides of the positive and negative electrodes,
A gap is created between the polymer layer and the separator. Further, even when the polymer layers are formed on both surfaces of the positive and negative electrodes and the separator, a gap is generated between these polymer layers. Then, in the battery manufacturing process, since the electrolytic solution is injected into this power generating element, the electrolytic solution penetrates into the central portion of the power generating element by the capillary phenomenon through the gap between the polymer layer and the electrode, etc. The inside of the electrode can be rapidly impregnated from the entire surface of the electrode. The polymer layer impregnated with the electrolyte in this way becomes a swollen or semi-molten state by heating and pressing the battery case itself in the heating and pressing step, and it adheres to the electrodes and fills the gap. You can Further, since this heating and pressing step is performed in a state where the battery case is sealed, even if the electrolytic solution or the like generates gas during heating, it is not released to the outside,
It will be possible to manufacture safely. Since the polymer layer may be swelled or semi-melted by heating and then pressed, it is sufficient to press the battery case at least during cooling.

Moreover, since the electrodes and the separators are stacked and wound in a state where the polymer layer is not impregnated with the electrolytic solution, it is difficult to manufacture the electrodes and the separator as in the case of handling a gel-like polymer layer. Nothing goes away. Further, since a predetermined amount of the electrolytic solution can be injected into the battery case, variations in the injected amount of the electrolytic solution will not occur. Further, since the separator is interposed between the electrodes, an internal short circuit of the battery is less likely to occur.

The method for producing a non-aqueous electrolyte battery according to claim 2 is
The pressing step is characterized in that the battery manufactured in the battery manufacturing step is heated and then cooled, and the battery case is pressed during the heating and cooling.

According to the second aspect of the present invention, in the heating and pressing step, the battery case is pressed not only during cooling but also during heating. Therefore, the gap between the polymer layer and the electrode is surely filled and bonded. Will be able to do.

The method for producing a non-aqueous electrolyte battery according to claim 3 is
In the pressing step, the maximum temperature of the power generation element during heating is 60 ° C. or higher and 100 ° C. or lower.

According to the third aspect of the present invention, since the heating temperature in the heating and pressing step is within the range of 60 ° C to 100 ° C, the polymer layer is heated at an optimum temperature to swell or semi-melt and then the electrode. It becomes possible to perform bonding with the like.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a partially enlarged vertical cross-sectional view of a power generating element in which a positive electrode and a negative electrode are laminated with a separator having polymer layers formed on both sides thereof. . The constituent elements having the same functions as those of the conventional example shown in FIG.

In this embodiment, a laminated polymer battery will be described. As shown in FIG. 1, the power generation element of this polymer battery is one in which a positive electrode 1 and a negative electrode 2 are laminated with a separator 3 in between. The positive electrode 1 is a positive electrode substrate 1a such as an aluminum foil carrying a positive electrode mixture 1b containing a positive electrode active material such as lithium cobalt oxide or lithium manganate, and the negative electrode 2 is a negative electrode such as a copper foil. A negative electrode mixture 2b containing a negative electrode active material such as graphite is carried on a base material 2a. Further, as the separator 3, here, a polyolefin film having a microporous structure or the like is used.

In the method of manufacturing the polymer battery of this embodiment, the case where the polymer layers 4 are formed on both surfaces of the separator 3 will be described. The polymer layer 4 is made of polyvinylidene fluoride (PVDF), polyhexafluoropropylene (PHF).
P) or polytetrafluoroethane (PTFE) or a copolymer thereof, or a resin layer made of a polymer material such as polyacrylonitrile (PAN), styrene-butadiene rubber, acrylic resin, polyester resin or the like. Therefore, it is preferable to form it so as to have porosity. Such a polymer layer 4 is formed by dissolving a polymer material in a solvent, applying it on the surface of the separator 3, and evaporating the solvent (polymer layer forming step).

The separator 3 having the polymer layer 4 formed thereon is interposed between the positive electrode 1 and the negative electrode 2 to be laminated to manufacture a power generating element (power generating element manufacturing step). At this time, the solvent is evaporated and the polymer layers 4 on both sides of the separator 3 are dried, so that the handling during the work is not troublesome. In this power generation element manufacturing process, the positive electrode 1
Since the negative electrode 2 and the negative electrode 2 are simply superposed with the separator 3 interposed therebetween, a slight gap is formed between the polymer layer 4 and the positive electrode 1 or the negative electrode 2 as shown in the drawing.

The power generating element is housed in a battery case (not shown), and an electrolytic solution is injected into the battery case to seal it (battery manufacturing process). The battery case may be a battery can or battery container made of metal or resin with a lid welded and adhered or attached by heat welding, or a laminated film in which a resin film is laminated on both sides of a metal foil. It is also possible to use a bag having a bag shape and heat-welded openings. The electrolytic solution is a non-aqueous electrolytic solution in which a lithium salt or the like is dissolved in an organic solvent. This electrolyte is normally injected under an environment of normal pressure. Further, the liquid injection can be performed in a depressurized environment of the battery case. Furthermore, after the liquid injection, the impregnation of the electrolytic solution can be promoted in an environment where the battery case is in a substantially depressurized state. The battery case containing the power generating element and filled with the electrolytic solution is hermetically sealed by closing a liquid inlet such as a lid or a laminated film. In addition, in this battery manufacturing process, after injecting the electrolytic solution, preliminary charging for charging the power generation element to 3.6 V / cell or more can be performed. When such preliminary charging is performed,
Since the film is surely formed on the negative electrode 2 before the bonding with the polymer layer 4, it is possible to improve the cycle characteristics and the safety of the battery. However, since gas may be generated in this preliminary charging, it is preferable to charge before sealing the battery case.

When the electrolytic solution is injected into the battery case in the above-mentioned battery manufacturing process, the electrolytic solution is exposed from between the positive electrode 1 and the negative electrode 2 at the end of the polymer layer 4 as shown by an arrow A in FIG. Not only soaking into the edges, but also as shown by arrow B in FIG.
Enter the gap between the polymer layer 4 and the positive electrode 1 or the negative electrode 2,
The capillary phenomenon reaches the central portion of the power generation element, and the polymer layer 4 permeates into the layer from the entire surface. Further, the positive electrode mixture 1b of the positive electrode 1 and the negative electrode mixture 2 of the negative electrode 2
Similarly, in b, the electrolytic solution comes to permeate from the edge and the entire surface.

The polymer battery manufactured in the above battery manufacturing process is heated once and then cooled, and at the same time, the battery case is pressed (heating and pressing process). When the polymer battery is heated, the polymer layer 4 of the power generating element housed in the battery case swells or semi-melts, and when cooled, the polymer layer 4 is solidified or returns to a gel state. Further, when the battery case is pressed during this cooling, the swollen or semi-molten polymer layer 4 adheres to the surfaces of the positive electrode 1 and the negative electrode 2 facing each other, and returns to the solidified or gel state to be adhered. When the laminated power generation element is used as in the present embodiment, the pressing of the battery case is preferably performed so as to be sandwiched from both sides in the stacking direction. Further, in the case of a winding type power generation element, it is preferable to press the entire peripheral side surface in the central axis direction. The battery case may be pressed not only during cooling but also during heating. If pressure is applied even during heating in this way, the polymer layer 4 melted and softened during heating is heated to the positive electrode 1
Since it can be pressed against the surface of the negative electrode 2 or the negative electrode 2, it is possible to reliably fill the gap between them and perform the bonding.

The heating in the above heating / pressing step is performed by heating the maximum temperature of the entire power generation element of the polymer battery to 60 ° C. or higher, 10
Optimally, it is carried out within the range of 0 ° C or lower.
If the heating temperature is lower than 60 ° C, the polymer layer 4 does not reach a molten state sufficient for adhesion. On the other hand, when the heating temperature is higher than 100 ° C, the polymer layer 4 melts too much,
If it is the porous polymer layer 4, this porosity may be impaired or it may melt out between the positive electrode 1 and the negative electrode 2.
Moreover, when the temperature becomes higher, gas is generated from the polymer layer 4, the electrolytic solution, etc., and the battery case expands. In addition, the heating time is preferably 5 minutes or more and less than 5 hours in order to ensure the adhesion to be sure and sufficient. Furthermore, the heating rate during heating is 0.01 ° C /
Seconds or more is preferable, and the temperature lowering rate at the time of cooling to 50 ° C is preferably 0.005 ° C / sec or more. This is because if the high temperature state is maintained for a long time, the polymer layer 4, the electrolytic solution and the like may be deteriorated or gas may be generated. However, if the temperature is lowered to 50 ° C. or lower during cooling, the bonding is surely performed. Therefore, by rapidly cooling the temperature to 50 ° C. or lower, the time required for the process can be shortened.

As described above, according to the method for manufacturing the polymer battery of this embodiment, when the electrolytic solution is injected into the battery case in the battery manufacturing process, the polymer layer 4 and the positive electrode 1 or the negative electrode 2 are formed.
This electrolytic solution enters the central portion of the power generation element through the gap between the polymer layer 4 and the positive electrode 1 or the negative electrode 2 and can be quickly impregnated into the inside. Therefore, the waiting time until the electrolytic solution is sufficiently impregnated into the power generating element can be shortened, so that the productivity of the polymer battery can be improved. Further, in this polymer battery, after the battery case is sealed, heating for adhering the polymer layer 4 is performed by a heating and pressing process,
Even if the electrolytic solution generates gas due to this heating,
It will not be released to the outside of the battery case, and it will be possible to manufacture safely.

Moreover, in the power generation element manufacturing process, since the polymer layer 4 formed on both surfaces of the separator 3 is laminated without the electrolytic solution impregnated therein, when the gel polymer layer 4 is handled. It will not be difficult to manufacture like the above. Further, in the battery manufacturing process, a predetermined amount of the electrolytic solution can be injected into the battery case, so that the injected amount of the electrolytic solution does not vary. Furthermore, in this polymer battery, since the separator 3 is interposed between the positive electrode 1 and the negative electrode 2, an internal short circuit of the battery is less likely to occur.

In the above embodiment, the case where the polymer layer 4 is formed on the separator 3 has been described, but the positive electrode 1
It may be formed on either or both of the negative electrode 2 and the negative electrode 2, or may be formed on all of the positive electrode 1 or the negative electrode 2 and the separator 3.

Further, in the above embodiment, the polymer battery provided with the laminated power generation element has been described, but the present invention can be similarly applied to the polymer battery provided with the wound power generation element. Further, as long as it is a battery provided with a power generation element in which the positive electrode 1 and the negative electrode 2 are bonded with the polymer layer 4 via the separator 3, the same can be applied to non-aqueous electrolyte batteries other than polymer batteries.

[0029]

Next, the present invention will be described based on preferred embodiments.

[Examples 1 to 11] In the non-aqueous electrolyte secondary battery according to the present invention, an oval-wound power generating element composed of a positive electrode plate, a separator and a negative electrode plate together with a non-aqueous electrolyte solution (not shown). It is housed in a metal laminated resin film case formed by heat welding a metal laminated resin film, and its appearance is shown in FIG. In FIG. 2, 11 is a power generation element, 12 is a battery case, 13 is a welding part of the battery case,
14 is a positive electrode terminal and 15 is a negative electrode terminal.

A lithium cobalt composite oxide was used as the positive electrode active material. The positive electrode plate is obtained by holding the above lithium cobalt composite oxide as an active material on a current collector. An aluminum foil having a thickness of 20 μm was used as the current collector. The positive plate is
PVDF 6 wt% which is a binder and acetylene black 4 wt% which is a conductive agent are mixed with 90 wt% of an active material, and N-methylpyrrolidone is appropriately added to prepare a paste, which is then applied to both surfaces of the current collector material. It was made by drying.

The negative electrode plate was prepared in a paste form by mixing 92 wt% of graphite (graphite) as a host substance and 8 wt% of PVDF as a binder on both sides of the current collector, and appropriately adding N-methylpyrrolidone. It was manufactured by applying and drying the product. The current collector of the negative electrode plate has a thickness of 15
A copper foil of μm was used.

The positive electrode plate and the negative electrode plate were pressed and molded so that the positive electrode plate had a thickness of 150 μm and a width of 48 mm and the negative electrode plate had a thickness of 160 μm and a width of 49 mm, and lead terminals were respectively attached to the positive electrode plate and the negative electrode plate. By welding, a positive electrode plate and a negative electrode plate for a non-aqueous electrolyte secondary battery according to the present invention were obtained.

As the separator, a polyethylene microporous film having a thickness of 20 μm, on which a porous PVDF-HFP copolymer layer was formed on both sides by 5 μm, was used. Porous PVDF-on the surface of polyethylene microporous membrane
As a method for forming the HFP copolymer, PVDF-H is used.
The NMP solution in which the FP copolymer was dissolved was applied to the polyethylene microporous membrane, and then immersed in purified water to remove NMP in the polymer solution and replace it with purified water to perform porosification. Then, by drying at 60 ° C, a polyethylene microporous membrane having a porous PVDF-HFP copolymer layer on the surface was obtained. Where porous PDVF
The coating amount of the -HFP copolymer was 10 g / m2.

The positive electrode plate, the negative electrode plate, and the separator are superposed in the order of positive electrode plate-separator-negative electrode plate-separator, with a rectangular winding core made of polyethylene as the center, and the longer side is the winding center axis of the power generating element. It was wound in an elliptical spiral shape around it so as to be parallel to each other to obtain a power generation element having a size of 50 × 35 × 3 mm.

Then, the insulating portion of the electrode was affixed to the side wall of the power generation element parallel to the winding central axis with a length corresponding to the electrode width using a polyethylene winding tape to fix the power generation element.

The elliptical winding type power generating element is housed in the concave surface of the metal laminated resin film case which has been subjected to a deep squeezing process in advance, and the lead terminal side and one side of the side surface are heat-welded into a bag shape and then welded. Not through the opening of the case,
Each electrode and the separator were sufficiently moistened with the electrolytic solution, and an amount such that there was no free electrolytic solution outside the power generating element was vacuum-injected.

The electrolytic solution contains 1 mol / l of LiPF ₆ ethylene carbonate: diethyl carbonate = 4:
A mixed solution of 6 (volume ratio) was prepared.

After that, the opening of the metal laminated resin film was sealed by heat welding while drawing a vacuum.

The obtained battery was left to stand in a constant temperature bath at each temperature for 30 minutes while being pressed with each pressing force shown in Table 1 using the battery pressing jig shown in FIG. Note that FIG.
, 21 is a battery, 22 is a compression spring, and 23 is SUS
It is a plate. Then, it was cooled to room temperature over 30 minutes while being pressed with the pressing force shown in Table 1. As described above,
Non-aqueous electrolyte secondary batteries A1 to A11 having a rated capacity of 500 mAh according to the present invention were manufactured as prototypes.

[Embodiment 12] In Embodiment 12, in the compressing step, compression is not performed at the time of heating and only 0.
A non-aqueous electrolyte secondary battery manufactured by the same components and manufacturing method as in Example 1 except that cooling was performed while pressing with a pressing force of 1 MPa / cm ² . This battery is A12
And

[Comparative Example 1] In Comparative Example 1, in the pressing step, pressing was performed with a pressing force of 0.1 MPa / cm ² during heating, but cooling was performed without pressing during cooling. It is a non-aqueous electrolyte secondary battery manufactured by the same constituent elements and manufacturing method as in No. 1. This battery was designated as A13.

[Comparative Example 2] In Comparative Example 2, a non-aqueous electrolyte produced by the same components and manufacturing method as in Examples 1 to 11 except that no compression was performed during heating and cooling during the compression step. It is a secondary battery. This battery was designated as A14.

Comparative Example 3 The manufacturing method of Comparative Example 3 will be described below. The same positive and negative electrode plates as in Examples 1 to 11 were used. A polyethylene microporous membrane was used for the separator.
After applying the NMP solution in which the PVDF-HFP copolymer was dissolved onto the polyethylene microporous membrane, the positive electrode plate and the negative electrode plate were respectively separated into the positive electrode plate, the separator, and the negative electrode plate before the polymer solution was dried. They were stacked one on top of the other, and were wound in an elliptical spiral shape around a rectangular winding core made of polyethylene so that the long side was parallel to the winding center axis of the power generation element. While pressing the obtained power generating element with a pressing force of 0.1 MPa / cm ² using the pressing jig shown in FIG.
NMP is removed by drying at C for 5 hours, and PVDF-HF is removed between the positive electrode plate and the separator and between the negative electrode plate and the separator.
Bonded with P-copolymer.

In the same manner as in Example 1, the power generating element was housed in the metal laminated resin film case, the electrolytic solution was injected, and the opening of the metal laminated resin film was sealed to obtain the non-aqueous electrolyte of Comparative Example 3. A battery was made. This battery was designated as B1.

[Comparative Example 4]

The manufacturing method of Comparative Example 4 will be described below. The same positive and negative electrode plates as in Example 1 were used. The separator is
A porous polymer membrane of PVDF-HFP copolymer was used.
The porous polymer film and the positive and negative electrode plates are superposed on each other in the order of positive electrode plate-separator-negative electrode plate, and the long side is parallel to the winding center axis of the power generation element with the rectangular winding core made of polyethylene as the center. So that it was spirally wound around it.
The obtained power generating element was measured using the compression jig shown in FIG.
While pressing with a compression force of 1 MPa / cm ² , PVDF-
Heat to 145 ° C, which is the melting point of the HFP copolymer,
The polymer film was melted and then cooled to obtain a power generation element in which the positive and negative electrodes were bonded with a polymer layer.

In the same manner as in Example 1, the power generating element was housed in a metal laminated resin film case, an electrolytic solution was injected, and then the opening of the metal laminated resin film was sealed to obtain a non-aqueous electrolyte of Comparative Example 4. A battery was made. This battery was designated as B2.

Therefore, the impregnation property of the electrolytic solution and the adhesion property between the electrode plates were confirmed. The obtained non-aqueous electrolyte secondary battery was disassembled, and whether the entire surface of the electrode plate was impregnated with the electrolytic solution (impregnating property of the electrolytic solution), and the positive electrode plate-separator and the negative electrode plate-separator were separated by the polymer layer. It was confirmed whether they were adhered (adhesiveness). The results are shown in Table 1. Further, in Comparative Examples 3 and 4, the disassembly survey was conducted after leaving for 1 hour after sealing so that the time from the injection to the disassembly survey was the same as that of the example.

Regarding the permeability of the electrolytic solution, the case where the area of the electrode plate which was not wet with the electrolytic solution was 20% or more of the total electrode plate area was x, and the area which was not wet was less than 20% but partially wetted. The case where there was no part was marked with △, and the case where the entire area was wet was marked with ○. Regarding the adhesiveness between the electrode plates, x is the case where they are not adhered at all, Δ is the case where less than 60% of the electrode plate area is adhered, and ○ is the case where 60% or more and less than 90% is adhered. The case where 90% or more was adhered was marked with ⊚.

[0051]

[Table 1] From the above results, in the manufacturing method of the present invention, since the electrolytic solution is injected before performing the adhesion between the electrode and the separator and the polymer layer, the electrolytic solution can be quickly impregnated into the power generating element. . Also, by applying pressure during cooling, good adhesion can be achieved. Further, the compression force during compression is preferably 0.03 MPa / cm ² or more. Further, the heating temperature at the time of compression is preferably 60 ° C. or higher.

[0052]

As is apparent from the above description, according to the method for producing a non-aqueous electrolyte battery of the present invention, the electrolyte solution is injected before the electrodes and the separator are adhered to the polymer layer. The electrolytic solution can be allowed to enter through the gap between the polymer layer and the electrode or the like to quickly impregnate the inside of the power generation element. In addition, since heating and pressing for adhering the polymer layer are performed in a state where the battery case is hermetically sealed, there is no fear of gas release, and safe manufacturing can be performed.

Moreover, since a predetermined amount of electrolytic solution can be injected into the battery case, there is no variation in the injected amount of this electrolytic solution. Moreover, since the separator is interposed between the electrodes, an internal short circuit of the battery is less likely to occur.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a partially enlarged vertical cross-sectional view of a power generation element in which a positive electrode and a negative electrode are laminated with a separator having polymer layers formed on both sides thereof.

FIG. 2 shows an example of the present invention and is a diagram showing the appearance of a non-aqueous electrolyte battery.

FIG. 3 shows an embodiment of the present invention and is a diagram showing a battery pressing jig.

FIG. 4 shows a conventional example and is a partially enlarged vertical cross-sectional view of a power generation element in which a positive electrode and a negative electrode are laminated and bonded via a separator having polymer layers formed on both surfaces.

[Explanation of symbols]

1 positive electrode 2 Negative electrode 3 separator 4 polymer layer

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Claims (3)

[Claims] 1. Positive and / or negative electrodes and / or
Alternatively, a polymer layer forming step of forming a polymer layer on both sides or one side of a separator, and a positive electrode, a negative electrode and a separator obtained in the polymer layer forming step are laminated or wound to produce a power generating element. Element manufacturing process, a battery manufacturing process in which this power generation element is housed in a battery case, and a battery is manufactured by injecting an electrolyte into the battery case and sealing the battery, and after cooling the battery after heating, at least at the time of cooling A method of manufacturing a non-aqueous electrolyte battery, comprising: a pressing step of pressing a battery case. 2. The pressing step comprises heating the battery manufactured in the battery manufacturing step and then cooling the battery, and pressing the battery case during the heating and the cooling. Manufacturing method of non-aqueous electrolyte battery. 3. The method for producing a non-aqueous electrolyte battery according to claim 1, wherein the maximum temperature of the power generation element during heating in the pressing step is 60 ° C. or higher and 100 ° C. or lower.