JP2001110401A - Liquid injection method and liquid injection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inject liquid more effectively in such an operation step that several kinds of liquid have to be injected into a space which is very narrow for the liquid to be stored. SOLUTION: A liquid injection apparatus for a liquid injected container 1, into which liquid should be injected comprises a chamber 31 which can alternatively keep an internal atmosphere thereof in a vacuum condition or in a pressurized condition, where the liquid injected container 1 and a liquid injection tool 32 are arranged in the chamber 31, so that liquid 35 is injected into the liquid injected container 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for injecting an electrolyte, that is, a liquid, into a liquid injection container such as a battery outer can in the manufacture of a non-aqueous electrolyte secondary battery, the manufacture of an electrolytic capacitor, and the like. The present invention relates to a liquid injection method and a liquid injection device which are preferably applied.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for lower price, smaller size, and larger capacity of secondary batteries used in the fields of automobiles, home electric parts, computers, and the like. In order to realize this low price, improvements such as reduction in cost of production equipment, improvement in productivity, and shortening of manufacturing time have been actively pursued. For this reason, development of an automatic manufacturing machine that enables automation of battery production, particularly mass production, has been actively performed. In this case, it is necessary that the operation rate be as high as possible and a high yield be obtained. However, in the improvement of the operation rate, the downsizing of the battery and the increase in the capacity have been bottlenecks for improving the operation rate by reducing the time required for injecting the electrolyte into the battery outer can.

As shown in a schematic cross-sectional view of one example of the nonaqueous electrolyte secondary battery, a battery body 2 is accommodated in, for example, a cylindrical outer can 1, and the nonaqueous electrolyte is contained in the outer can 1. An electrolyte (not shown) is injected, and this non-aqueous electrolyte is
It is impregnated. As shown in the open perspective view of FIG. 8, the battery body 2 has a film-like positive electrode 21 and a film-like negative electrode 22 each laminated via a film-like separator 23. Hole 2
For example, it is formed in a spiral shape in cross section around a cylindrical core 24 having a cylindrical shape.

As shown in FIG. 7, for example, a disc-shaped positive electrode current collector 3 is provided at both ends of a battery body 2 accommodated in an outer can 1.
And a negative electrode current collector 4. The battery body 2 is housed in an outer can 1 made of a bottomed tubular body such that the negative electrode current collector 4 is located on the bottom side of the outer can 1. The open end of the can 1 is closed by a top cover 6 having a safety valve mechanism 5. One end of a ribbon-shaped lead piece 8 made of, for example, Al foil is welded to the positive electrode current collector 3, and its free end is welded to the safety valve mechanism 5.

When such a battery is manufactured, an electrolytic solution is filled in the outer can 1 in which the battery body 2 is housed before the top cover 6 is attached to the open end of the outer can 1 described above. .

This filling is performed by injecting an electrolytic solution into the center hole 24h of the cylindrical core 24 of the battery main body 2 from the open end side of the outer can 1 so that the cylindrical core 24 is filled. A method of impregnating the separator of the battery body from the other end by infiltrating the electrolytic solution by, for example, capillary action is used.

The injection of the electrolytic solution is performed by a dropper or the like. However, since air exists in the outer can 1, the electrolytic solution is pushed out by the remaining air, and a required amount of the electrolytic solution is continuously discharged. Infusion cannot be performed. Then, at the time when the injection of the electrolyte cannot be performed due to the air present in the outer can 1, the outer can 1 is left in the vacuum chamber for a required time to draw out the air in the outer can 1 to the outside. An injection method of injecting an electrolyte is employed.

However, as described above, the outer can 1 is reduced in size due to the further miniaturization and large capacity of the battery.
On the other hand, by increasing the amount of winding of the battery body 2, the proportion of the contents in the outer can 1 increases, and the space existing in the outer can 1 becomes narrower. Since it is desired that the amount of the solution is as large as possible, it takes a long time to inject the electrolytic solution, which significantly reduces workability, and furthermore, it is difficult to automate and mechanize the electrolytic solution injection. It is becoming. As a result, the operating rate is reduced, which hinders the cost reduction of the battery.

[0009]

The present invention involves a process for injecting various liquids into a narrow liquid accommodating space, such as the production of a non-aqueous electrolytic cell as described above or the production of a capacitor. In such a case, the liquid injection can be performed efficiently.

[0010]

In the liquid injection method according to the present invention, the liquid injection into the liquid injection container into which the liquid is injected is performed in the same chamber and the atmosphere in the chamber is evacuated. And a step of pressing.

A liquid injection device according to the present invention is a liquid injection device for a liquid injection container into which a liquid is injected, such that the internal atmosphere can be converted and maintained between a vacuum state and a pressurized state. A liquid injection container and a liquid injection jig for the liquid injection container are arranged in the chamber, and the liquid is injected into the liquid injection container. The liquid injection jig includes a liquid storage chamber for storing the liquid, a liquid supply port for supplying the liquid to the liquid storage chamber, and a liquid discharge port that communicates with the liquid storage chamber and is connected to the liquid injection port of the liquid injection container. And an opening for communicating the liquid discharge section into the chamber.

In the above-described liquid injection method according to the present invention, the liquid is injected in the same chamber in which a vacuum and a pressurized atmosphere can be provided, and the air in the liquid injection container is discharged under the vacuum atmosphere. , And the operation of injecting the liquid under a pressurized atmosphere is performed alternately and continuously, for example, so that the operation time of the liquid injection can be reduced, the operation can be reliably performed, and automation can be performed.

Further, in the liquid injection apparatus according to the present invention, the chamber for obtaining both the vacuum and pressurized states of the internal atmosphere is connected to the liquid injection container in a liquid-tight manner, in which the injection liquid is accommodated and the opening is provided. By disposing a liquid injecting jig having a special configuration so as to be communicated with the atmosphere in the chamber through the above, the liquid injecting jig to be used for liquid injecting is kept connected to the liquid to be injected, and the liquid injecting jig is described above. The operation of discharging the air in the liquid injection container under a vacuum atmosphere and performing the liquid injection under a pressurized atmosphere can be performed alternately and continuously, thereby simplifying the liquid injection device and shortening the operation time. It is possible to shorten the time, ensure the work, and automate.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid injection method according to the present invention comprises the steps of: injecting a liquid into a liquid injection container into which liquid is injected, for example, an outer can of a battery; In the same chamber, a step of drawing the air in the liquid injection container to the outside while the atmosphere in the chamber is in a vacuum state and a step of injecting a target liquid, for example, an electrolytic solution in a pressurized state, are performed. It is desirable that the vacuuming operation and the pressure injection are repeatedly performed.

A liquid injection device according to the present invention is a liquid injection device capable of performing the above-described method of the present invention. One embodiment of the present invention and one embodiment of the method of the present invention using the same. Non-aqueous electrolyte 2 shown in FIG.
A case where the present invention is applied to the manufacture of a secondary battery will be described.

First, the non-aqueous electrolyte 2 to which the present invention is applied
Next, the battery will be described. This non-aqueous electrolyte secondary battery is
As shown in a schematic cross-sectional view of one example in FIG. 7, for example, a battery main body 2 is housed in a cylindrical outer can 1 made of, for example, nickel-plated iron, and a nonaqueous electrolytic solution is contained in the outer can 1. The non-aqueous electrolyte (not shown) is injected into the battery body 2
It is impregnated.

As shown in an open perspective view of FIG. 8, the battery body 2 is formed by laminating a film-like positive electrode 21 and a film-like negative electrode 22 via a film separator 23 in the same manner. , Around a cylindrical core 24 made of, for example, polypropylene having a center hole 24h.

The positive electrode 21 and the negative electrode 22 are shown in FIG.
As shown in the schematic plan views of A and B, in the positive electrode 21, a positive electrode active material 21 m is applied to both sides of a strip-shaped electrode sheet 21 s made of, for example, an Al foil, and in the negative electrode 22, for example, a Cu foil is used. The negative electrode active material 22m is applied to both sides of the belt-shaped electrode sheet 22s formed as described above.

The positive electrode active material 21m can be composed of an active material of, for example, a lithium transition metal oxide.
The negative electrode active material 22m can be made of, for example, an active material made of, for example, carbon that is doped or dedoped with lithium.

The separator 23 is made of, for example, polyethylene,
A microporous membrane made of polypropylene can be used.

Then, each of the electrode sheets 21s and 22s
Notches are formed at one side edge of each of the electrodes while maintaining a required interval, and a plurality of strip-like positive electrode leads 2 are formed between these notches.
1L and the negative electrode lead 22L are formed. Then, as described above, the positive electrode lead 21L and the negative electrode lead 22L are wound around the cylindrical core body 24 in a state of being overlapped with the separator 23 interposed therebetween. At this time, each of the strip-shaped positive electrode lead 21L and the negative electrode lead 22
L is disposed so as to be located at ends of the cylindrical battery body 2 wound around the cylindrical core 24 on opposite sides in the axial direction.

A cylindrical battery body 2 accommodated in an outer can 1
For example, a disc-shaped positive electrode current collector 3 and a negative electrode current collector 4 to which the positive electrode lead 21L and the negative electrode lead 22L are electrically connected, respectively, are disposed. The positive electrode current collector 3 includes a ribbon-shaped lead piece 8 made of a metal foil such as an Al foil.
Is welded at one end. Although not shown, the ribbon-shaped lead piece 8 is actually used in a state where, for example, two metal foil ribbons are overlapped.

The battery body 2 is accommodated in an outer can 1 made of a bottomed cylindrical body such that the negative electrode current collector 4 is located on the bottom side of the outer can 1. Tongue-like connecting piece 28 formed by punching and folding
Is welded to the bottom of the outer can 1. And the outer can 1
A conductive metal top cover 6 having a safety valve mechanism 5 is attached to the open end of the cover.

The safety valve mechanism 5 includes, for example, a safety valve 51 made of a conductive aluminum thin plate having a bulging portion 51a bulging toward the inside of the outer can 1, for example, in the center portion. In a state of being overlapped with the flange around the top cover 6 via the coefficient resistance element 27, the outer can 1 is caulked and attached to the open end of the outer can 1 via the gasket 7. On the battery body 2 side of the safety valve 51, a stripper disk 52 made of, for example, Al and having a through hole 52a formed in the center is disposed via an insulating ring 10. On the other hand, for example, the sub disk 9 is welded to the free end of the lead piece 8, and the bulging portion 51 a of the safety valve 51 is welded to the sub disk 9 through the through hole 52 a of the stripper disk 52. Thus, the open end of the outer can 1 is closed by the safety valve mechanism 5. In this configuration, when gas is generated in the outer can 1 and the internal pressure of the gas becomes higher than a required pressure, the internal pressure causes the safety valve 51 to bulge and deform toward the top cover 6 and weld the safety valve 51 to the sub-disk 9. When the portion is peeled off and electrically interrupted, and the internal pressure is weakened and the internal pressure further rises, the safety valve 51 is broken, for example, at a thin portion formed at a part thereof, and is formed at, for example, the top cover 9. It is designed to open through a vent (not shown).

When such a battery is manufactured, before the top cover 6 is attached to the open end of the outer can 1 described above, the nonaqueous electrolyte solution is placed in the outer can 1 in which the above-described battery main body 2 is accommodated. Filling is done. That is, the separator 23 is impregnated with the electrolytic solution, and at the same time, the space of each part in the outer can 1, that is, the gap is filled. This non-aqueous electrolyte comprises an organic solvent and an electrolyte dissolved therein. Organic solvents include, for example, cyclic carbonates such as ethylene carbonate and propylene carbonate, dimethyl carbonate, chain carbonates such as diethyl carbonate, γ-
At least one of cyclic esters such as butyrolactone and γ-parolelactone, chain esters such as ethyl acetate and methyl propionate, and ethers such as tetrahydrofuran and 1,2-dimethoxyethane can be used. Examples of the electrolyte include lithium salts that dissolve in the solvent used and exhibit ionic conductivity, such as LiPF ₆ , LiBF ₄ , and LiClO.
₄ , LiCF ₃ SO ₃ , LiN (CF ₃ SO ₂ ) ₂ , L
One or more kinds such as iC (CF ₃ SO ₂ ) ₃ can be used.

This electrolytic solution is filled into the outer can 1 in the center hole 24 h of the cylindrical core 24 of the battery body 2.
By injecting the electrolytic solution from the upper end (open end) side of the battery core, each separator of the battery body is impregnated with the electrolytic solution together with, for example, the action of the capillary phenomenon from the lower end side of the cylindrical core 24.

The apparatus and method of the present invention can be applied to such injection of an electrolytic solution. The liquid injection device according to the present invention, as shown in FIG.
A chamber 31 is provided. The chamber 31 is provided with a supply / exhaust port 25 for supplying and exhausting a gas, for example, clean air, and a liquid supply port 26. The supply / exhaust port 25 is connected to an evacuation unit 33 that evacuates the chamber 31, for example, a vacuum, that is, a vacuum pump, and a gas supply source 34 for pressurizing (positive pressure) the interior of the chamber 31, such as compression. Connect the air source. Then, by switching and connecting or switching the exhaust means 33 and the gas supply source 34, the inside of the chamber 31 is
It can be converted to a vacuum and pressurized atmosphere.

In the chamber 31, there is provided a liquid injection container, that is, the battery can 1 in this example, and a liquid inlet of the battery can 1, that is, the cylindrical core of the battery body 2 housed in the battery can 1 in this example. The upper end of the body 24 (the end on the open end side of the battery can 1) can be provided with an electrolyte inlet, that is, a liquid injection jig 32 connected to the liquid inlet 24a.

As shown in a schematic cross-sectional view of one example of this liquid injection jig 32, the jig main body 32A is made of, for example, a synthetic resin molded body such as polypropylene, for example, and is fitted to the jig main body 32A by screwing or the like. And the lid 32B. And these jig bodies 3
A liquid storage chamber 36 that stores a predetermined amount of liquid, that is, a nonaqueous electrolyte in this example, is provided by the cooperation of 2A and lid 32B. As shown in FIG. 1, the liquid storage chamber 36 communicates with a liquid supply port 37 connected to a liquid supply source 50 of the chamber 31. In front of the liquid injecting jig 32, a cylindrical liquid injecting portion 38, which can be connected to the liquid injecting port 24a of the battery main body 2 in a liquid-tight manner, protrudes. The inner end of the portion 37 communicates with the upper end of the liquid storage material 36. In addition, the liquid injection jig 3
An opening 39 communicating with the inside of the chamber is provided on the back surface of 2. As described above, the liquid injecting portion 38 is provided so as to protrude forward from the liquid injecting jig 32, and the tip of the liquid injecting portion 38 has a liquid-tight shape corresponding to the inner shape of the liquid injecting port 24a. It is formed so that it can be inserted into the liquid inlet 24a.

The outer peripheral portion 40 of the liquid injecting jig 32 at the portion from which the liquid discharging portion 38 is drawn out has a shape corresponding to the inner periphery of the open end of the battery can 1. A ring-shaped packing 41 is attached to the part 40, and the outer peripheral part 40 is fitted and connected in a liquid-tight manner within the open end of the battery can 1. At the rear of the battery can 1, pressing means 6 for elastically pressing the battery can 1 toward the liquid injection jig 32 to stably hold these connections.
1 is provided.

As shown in FIG. 5, a through hole 42 is formed in the liquid injection jig 32 adjacent to the liquid pouring portion 38, and the liquid injection jig 32 accommodates the battery body 2. A lead insertion portion 43 into which the lead piece 8 of the battery main body 2 is inserted into the liquid injection jig 32 while being connected to the battery can 1 is formed. The lead insertion portion 43 and the liquid storage chamber 36
A partition 44 is arranged between the liquid and the liquid injection part 36 so that the lead piece 8 is not wet (wet) by the injected liquid.

On the other hand, in the chamber 31, at a predetermined position in the chamber 31, that is, in a state of being connected to the battery can 1, a liquid feeder connected to a liquid supply port 37 of a liquid injection jig 32 is provided. A supply port 26 is provided.

Next, a method of manufacturing a battery by the method of the present invention using the above-described apparatus of the present invention, particularly an example in which an electrolyte is injected into the battery can 1 will be described. First, in this case, as shown in FIG. 1, the liquid injection direction of the liquid injection container, that is, the battery can 1, and the liquid injection jig 32 connected thereto are substantially horizontal, that is, substantially perpendicular to the gravity direction g. It is arranged so that it becomes the direction. That is, in this example, the axial direction of the cylindrical core 24 of the battery main body 2 and the axial direction of the liquid injection portion 38 connected thereto are arranged so as to be substantially parallel to the above-described horizontal direction. At this time, the liquid storage chamber 36 of the liquid injection jig 32 is positioned below in the direction of gravity g.

In the liquid storage chamber 36, a chamber 31 is provided.
Through the liquid supply port 26 of the liquid injection jig 32 and the liquid supply port 37 of the liquid injection jig 32.
, A predetermined amount of liquid 35 corresponding to the filling amount of the electrolyte is supplied and stored. At this time, the internal volume of the liquid storage chamber 36 is selected so that the liquid surface 35 s of the liquid 35 is located below the liquid injection part 38.

Then, in this state, as shown in FIG.
Pre-pressurizing for 5 seconds, opening for 5 seconds (atmospheric pressure)
A first vacuum step for 30 seconds, an opening step for 5 seconds,
30 seconds first pressing step, 5 seconds opening step, 30 seconds second vacuum step, 5 seconds opening step, 30 seconds second pressing step, 5 seconds opening step, 25 seconds A third vacuum step, an opening step for 5 seconds, a third pressing step for 40 seconds, an opening step for 10 seconds, a fourth pressing step for 30 seconds,
An open process for 5 seconds is performed to perform electrolytic injection for a total injection process time of 4 minutes and 35 seconds.

The set value of the above pre-pressurization is 0.25 kg
/ Cm ² , vacuum set value in each vacuum step is -740 m
mHg, pressurization set value in each pressurization step is 4.80 kg
/ Cm ² .

After a lapse of 20 seconds during the first vacuum step, as shown in FIG. 2, the liquid injection container 1 and the liquid injection jig 32 are maintained in the above-described connection relationship,
For example, the chamber 31 is rotated by 35 degrees from the horizontal state of FIG. 1 for 35 seconds as shown in FIG. 2 and tilted in this state.
Allow the remaining 5 seconds of the first vacuum step to elapse. Thereafter, at this rotation position, the first pressurization is performed, and the liquid contained in the liquid containing chamber 36, that is, the electrolytic solution 35, is sent to the liquid filling section 38, and injected into the battery can 1 through the liquid filling port 24a. I do.

After a lapse of 20 seconds in the second vacuum step, the liquid injection container 1 and the liquid injection jig 32 are connected to each other as shown in FIG. While maintaining the relationship, for example, the chamber 31
In a second, it is further rotated by 35 ° and tilted from a horizontal state to 70 °, and in this state, the remaining 5 seconds of the second vacuum step are passed. Thereafter, at this rotational position, a second pressurization is performed, and at this 70 ° rotational position, a change in the liquid surface 35s of the electrolytic solution 35 contained in the liquid containing chamber 36 causes the electrolytic solution 35 to change.
Is sent to the liquid injection section 38 and injected into the battery can 1 through the liquid injection port 24a.

Further, after a lapse of 15 seconds in the third vacuum step, a state in which the liquid injection container 1 and the liquid injection jig 32 are maintained in the above-described connection relationship as shown in FIG. Then, for example, the chamber 31 is kept
Rotate it from the horizontal state to 90 °, that is, the vertical state. In this state, the remaining 5 seconds of the second vacuum step elapse. Thereafter, at this rotational position, a third pressurization is performed, and by this vertical state, all the electrolytic solution 35 accommodated in the liquid accommodating chamber 36 is sent to the liquid injecting section 38 and the liquid injecting port 2
Inject into the battery can 1 through 4a.

In this manner, a predetermined amount of the liquid contained in the liquid injection jig 32, that is, the entire amount of the electrolytic solution 35 is injected from the liquid injection section 38 into the cylindrical core 24 of the battery body 2. I do. In this way, the liquid, ie, the electrolytic solution, which has flowed into the tubular core 24, permeates into the battery body 2 from the lower end of the tubular core 24.

As described above, the liquid, ie, the electrolytic solution, which has flowed into the cylindrical core 24, is subjected to the internal pressure caused by the air remaining in the liquid injection container, ie, the outer can 1, by repeating the vacuum process and the liquid injection. The liquid injection into the liquid injection container 1 can be performed effectively, that is, quickly and reliably, without being disturbed by the liquid.

2 to 4, the supply / exhaust port 25 and the liquid supply port 2 in the chamber 31 described with reference to FIG.
6 and the exhaust means, the pressing means 61 and the like connected thereto are not shown. Also, in FIG.
May be provided at a position that does not directly face the liquid injection jig 32 as shown in the figure, but may be disposed at a position connected to the opening 39 of the liquid injection jig 32, for example.

Table 1 shows that the electrolytic solution EL was prepared for 20 outer cans 1 by the method of the present invention using the apparatus of the present invention described above.
Shows the measurement results of the injection state when 45.5 g was injected (referred to as work Nos. 1 to 20).

[0044]

[Table 1]

In the measurement of the injection amount, the weight before and after injection of the electrolytic solution EL into the outer can 1 is measured, and the difference between the two is defined as the injected EL amount. Table 1 shows the average value (Avg), the standard deviation σ (Std), and the maximum value (Ma
x), minimum value (Min), 6σ, maximum value of 6σ (Max
(6σ)) and the minimum value of 6σ (Min (6σ)).
In this case, the standard center value is 45 g, and the standard upper limit value is 4
6g, lower limit of standard = 44g, standard width = 2g, Cp is a process capability index (= standard width / (6 × standard deviation)) from the standard width, and Cpk is a process capability from the standard center value. Exponent (= (| S | -actual average value) / (3 × standard deviation) (where S is a value closer to the actual average value of the standard upper limit value and the lower limit value).

As is clear from Table 1, despite the fact that the total injection step time was 4 minutes and 35 seconds as described above,
It can be seen that good injection has been performed.

As described above, in the method of the present invention,
Evacuate the air in the liquid injection container under vacuum atmosphere,
Since the operation of injecting the liquid under the pressurized atmosphere is performed alternately and continuously, it is possible to avoid that the injection of the liquid is hindered by the air remaining in the liquid injection container, and furthermore, the vacuum Since the above-described liquid injection operation is performed in the same chamber for obtaining the pressurized atmosphere, it is possible to prevent the liquid injection from being hindered by air remaining in the liquid injection container, and to prevent the liquid injection from being interrupted. Since the moving operation of the liquid injection container at the time of pressure can be avoided, the operation speed of the liquid injection can be doubled as compared with the conventional case.

In the liquid injection apparatus according to the present invention, the liquid to be injected is contained in the common chamber 31 for obtaining both the vacuum and pressurized state of the internal atmosphere in a liquid-tight manner. In addition, by disposing a liquid injection jig 32 having a special configuration so as to communicate with the atmosphere in the chamber 31 through the opening, the liquid injection jig 32 to be used for the liquid injection is connected to the liquid injection container 1. In this state, the operation of discharging the air from the liquid injection container 1 under the above-described vacuum atmosphere and performing the liquid injection under the pressurized atmosphere can be performed alternately and continuously. In addition, the simplification of the liquid injection device, the reliability of the operation, and the automation can be realized, and the shortening of the operation time is remarkably improved.

According to the above-described liquid injection device, when a battery is formed, the outer peripheral portion 40 of the liquid injection jig 32 is connected to the open end of the battery outer can 1 via the packing 41. By doing so, it is possible to avoid leakage of the electrolytic solution during the electrolyte injecting operation, that is, wetting, so that in the set of the gasket 7 described with reference to FIG. 7, so-called rising of the electrolytic solution due to this wetting can be avoided. Alternatively, the cleaning operation for eliminating this wetting can be simplified. Therefore, simplification of work,
Reliability can be improved.

Further, according to the above-described structure, the lead piece 8 of the battery body 2 is connected to the liquid, that is, the electrolyte injection portion, and the partition 44.
With this configuration, the lead piece 8 is prevented from getting wet by the electrolytic solution. Therefore, it is possible to avoid the work of wiping the electrolyte attached to the lead pieces after the injection of the electrolyte, so that the workability and the reliability can be further improved.

In the above-described example of the method of the present invention, the case where the process goes through the four stages of FIGS. 1 to 4 is not limited to the four stages, but goes through the three stages or four or more arbitrary stages. be able to.

In the above-described example of the apparatus according to the present invention, the supply / exhaust port 25 is provided in the chamber 31. However, various modifications and changes are made such as providing the exhaust port and the gas supply port separately. Also, the liquid injection jig 32 can be variously modified or changed in its detailed structure according to the usage mode or the like.

In the above example, one chamber 3
In this case, one set of the liquid injection container 1 and the liquid injection jig 32 are arranged in one. As shown in FIG. 6, a plurality of sets, for example, ten liquid injection containers 1 are arranged. And
On the other hand, it is also possible to adopt a configuration in which ten liquid injection jigs 32 connected to these liquid injection containers 1 are connected to these liquid injection containers 1 and these liquid injection jigs 32 are simultaneously connected to the corresponding injection containers 1 respectively. . In this case, by simultaneously repeating and tilting the above-described vacuum atmosphere and pressurized atmosphere in one common chamber, the liquids, for example, the electrolytes respectively contained in the respective liquid injection jigs 32 in a predetermined amount are simultaneously discharged to the respective liquid-receiving jigs. Injection into the injection container 1 can be performed, and by doing so, the workability can be further improved, and thus the mass productivity can be improved. 6, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

Alternatively, a plurality of chambers in each of which a set of the liquid injection container 1 and the liquid injection jig 32 are provided, and these chambers are simultaneously operated to perform the liquid injection operation for the plurality of liquid injection containers 1. Can be performed at the same time to improve mass productivity, and the present invention is not limited to the illustrated example.
Various changes can be made, and as described above, not only when applied to the production of a non-aqueous electrolyte battery, but also in the injection of an electrolyte in other battery configurations, or for example, in the production process of an electrolytic capacitor. It can also be applied to liquid injection and the like.

[0055]

As described above, in the method of the present invention, in the same chamber for obtaining a vacuum and a pressurized atmosphere,
The operation of discharging the air in the liquid injection container under a vacuum atmosphere and performing the liquid injection under a pressurized atmosphere, for example, is performed alternately and continuously, so that the injection eliminates the air remaining in the container. By being able to do
Effectively, liquid injection becomes possible. For example, in the manufacture of a battery, the liquid injection operation can be performed twice as fast as the conventional case. Further, as described above, for example,
When the injection is simultaneously performed on zero liquid injection containers, the substantial liquid injection time per line can be further reduced to 1/10.

In the liquid injection device according to the present invention, the liquid to be injected is contained in the common chamber 31 for obtaining both the vacuum and the pressurized state of the internal atmosphere in a liquid-tight manner. In addition, by disposing the liquid injection jig 32 having a special configuration so as to communicate with the atmosphere in the chamber 31 through the opening, the liquid injection jig used for liquid injection is kept connected to the liquid injection container. In this state, the operation of discharging the air in the liquid injection container under the above-described vacuum atmosphere and performing the liquid injection under the pressurized atmosphere can be performed alternately and continuously. This makes it possible to simplify the apparatus, shorten the operation time, ensure the operation, and automate the operation, thereby reducing the reliability and cost of products, for example, batteries.

According to the method and the apparatus of the present invention, the liquid can be reliably injected into the liquid injection container. Can be. Therefore, for example, in a battery, a capacitor, and the like, the yield can be improved and the characteristics can be made uniform.

As described above, in the manufacture of the battery, by avoiding the adhesion of the electrolytic solution to the lead piece, the removal of the electrolytic solution attached to the lead piece, for example, the wiping operation can be avoided. The piece can be reliably welded to the above-described safety valve, and reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of one example of a liquid injection device according to the present invention in one step of a liquid injection method according to the present invention.

FIG. 2 is a schematic cross-sectional view of one example of the liquid injection device according to the present invention in one step of the liquid injection method according to the present invention.

FIG. 3 is a schematic cross-sectional view in one step of a liquid injection method according to the present invention, which is an example of the liquid injection apparatus according to the present invention.

FIG. 4 is a schematic cross-sectional view of one example of the liquid injection device according to the present invention in one step of the liquid injection method according to the present invention.

FIG. 5 is a schematic sectional view showing an example of a liquid injection jig of the liquid injection device according to the present invention.

FIG. 6 is a schematic sectional view showing an example of the device of the present invention.

FIG. 7 is a schematic sectional view showing an example of a non-aqueous electrolytic battery.

FIG. 8 is a perspective view showing an open state of an example of a battery body of an example of a nonaqueous electrolytic battery.

FIGS. 9A and 9B are schematic plan views showing examples of a positive electrode and a negative electrode, respectively.

FIG. 10 is a process diagram of an example of the method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer can (liquid injection container) 2 ... Battery body 3 ... Positive electrode current collector 4 ... Negative electrode current collector 5 ...
・ Safety valve mechanism, 6 ・ ・ ・ Top cover, 7 ・ ・ ・ Gasket, 8 ・ ・ ・ Lead piece, 9 ・ ・ ・ Sub disk, 10
... insulating ring, 21 ... positive electrode, 22 ... negative electrode, 21s, 22s ... electrode sheet, 21m ...
・ Positive electrode active material, 22m ・ ・ ・ Negative electrode active material, 21L ・ ・ ・
Positive electrode lead, 22L ... negative electrode lead, 23 ... separator, 24 ... cylindrical core, 24h ... center hole, 2
4a: Liquid inlet, 25: Supply / exhaust port, 26 ...
・ Liquid supply port, 27 ・ ・ ・ Positive temperature coefficient resistance element, 28 ・
..Connection pieces, 31 ... Chamber, 32 ... Liquid injection jig, 32A ... Jig body, 32B ... Lid, 3
3 ... exhaust means, 34 ... gas supply source, 35 ...
Liquid (non-aqueous electrolyte), 36 ... Liquid storage chamber, 37 ...
・ Liquid supply port, 38 ・ ・ ・ Liquid injection part, 39 ・ ・ ・ Opening, 40 ・ ・ ・ Peripheral part, 41 ・ ・ ・ Packing, 42 ・
..Through holes, 43 ... lead insertion portions, 44 ... partition walls,
50: liquid supply source, 51: safety valve, 51a ...
・ Swelling part, 52 ... stripper disk, 61 ...
Pressing means

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H01G 13/00 371 H01G 9/00 301D 381 9/02 311

Claims (11)

[Claims] 1. A method for injecting a liquid into a liquid injection container into which a liquid is to be injected through a step of setting a vacuum state in the chamber and a step of setting a pressurized state in the same chamber. Characteristic liquid injection method. 2. The method according to claim 1, further comprising the steps of: starting the liquid injection into the liquid injection container; setting the atmosphere to a vacuum state; Item 6. The liquid injection method according to Item 1. 3. The liquid injection container is a battery outer can containing a battery main body having at least a positive electrode and a negative electrode constituting a secondary battery, wherein the liquid is an electrolytic solution. The liquid injection method according to claim 1, wherein 4. The liquid injection container is provided on a cylindrical core,
A battery outer can containing a battery body in which at least a film-like positive electrode and a negative electrode constituting a secondary battery are laminated and wound with a film-like separator interposed therebetween, wherein the liquid is an electrolytic solution. The liquid injection method according to claim 1, wherein 5. A liquid injection device for a liquid injection container into which a liquid is injected, wherein a chamber capable of converting and holding an internal atmosphere between a vacuum state and a pressurized state is provided. The liquid injection container and a liquid injection jig for injecting liquid into the liquid injection container are arranged, the liquid injection jig includes a liquid storage chamber for storing the liquid,
A liquid supply port for supplying the liquid to the liquid storage chamber, a liquid discharge section that communicates with the liquid storage chamber and is connected to a liquid injection port of the liquid-receiving container, and connects the liquid discharge section inside the chamber. And an opening communicating with the liquid injection device. 6. The apparatus according to claim 5, wherein said chamber is connected to exhaust means for making the inside of said chamber a vacuum atmosphere and a gas supply source for making the inside of said chamber a pressurized atmosphere. 3. The liquid injection device according to 1. 7. The liquid injection device according to claim 5, wherein a plurality of sets of the liquid injection container and the liquid injection jig connected thereto are arranged. 8. The liquid injection container is a battery outer can containing a battery main body having at least a positive electrode and a negative electrode constituting a secondary battery, wherein the liquid is an electrolytic solution. The liquid injection device according to claim 5, wherein 9. The liquid injection container is a battery outer can containing a battery main body having at least a positive electrode and a negative electrode constituting a secondary battery, and the battery main body is mounted on a cylindrical core. 6. The liquid injection device according to claim 5, wherein at least a film-like positive electrode and a negative electrode constituting each of the secondary batteries are laminated and wound with a film-like separator interposed therebetween. 10. The liquid injection container is characterized in that a battery body in which at least a film-like positive electrode and a negative electrode constituting a secondary battery are laminated and wound via a film-like separator on a cylindrical core body. The liquid injection device according to claim 5, wherein the battery outer can is accommodated, and the liquid injection portion of the liquid injection jig is connected to one end of the cylindrical core. 11. The liquid injection container is a battery outer can containing a battery main body having at least a positive electrode and a negative electrode constituting a secondary battery, and the liquid injection jig is provided from the battery main body. 6. An insertion part for a lead piece led out, wherein the insertion part for the lead piece is liquid-tightly separated via the partition wall from the liquid ejection part and the liquid storage chamber. 3. The liquid injection device according to claim 1.