JP2000340215A - Injecting method for electrolyte in manufacturing battery, and electrolyte injecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injecting method for electrolyte in manufacturing a battery and a device thereof capable of injecting a predetermined amount of electrolyte at one time, contracting time for liquid penetration, improving operationality of manufacture of a battery and performance reliability of the battery. SOLUTION: An electrolyte discharging mouth 25 of an injecting tank 20 supplied with a necessary amount of electrolyte for injecting in a battery can 18 is connected with an opening part 24 of the battery can 18. The battery can 18 and the injecting tank 20 are positioned in level in a state that the electrolyte in the injecting tank 20 does not flow into the battery can 18. In this state, the battery can 18 and the injecting tank 20 are degassed without through the electrolyte. Then, the battery can 18 and the injecting tank 20 are stood up to a vertical position with the battery can 18 positioned below. The electrolyte in the injecting tank 20 is injected in the battery can 18 through the electrolyte discharging mouth 25, and the electrolyte is pressured when injected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention constitutes a part of a manufacturing apparatus for manufacturing, for example, a lithium battery, and an electrolyte injection method and an electrolyte injection apparatus in battery manufacturing for automatically injecting an electrolyte into a battery container. It is about.

[0002]

2. Description of the Related Art Conventionally, many batteries are known in which an electrolytic solution is injected into a battery container in which a plurality of plate-like electrodes are stacked and accommodated. Also, many devices for injecting an electrolyte into a battery container have been proposed, for example, Japanese Patent Application Laid-Open No. 7-990.
No. 50, JP-A-9-283114, and the like.

[0003] In a conventional method of injecting an electrolytic solution in the production of a battery, an injecting tank for storing an electrolytic solution is arranged above a battery container containing a plate-like electrode, and an electrolyte outlet of the injecting tank is connected to the battery container. The electrolytic solution in the injection tank was injected into the battery container while being repeatedly brought into close contact with the opening and repeatedly pressurized and vacuumed. At this time, vibration is also applied to remove the gas phase in the gap between the electrodes and promote impregnation.

[0004]

However, in the conventional method for injecting an electrolytic solution, since the effect of pressurization and vacuum is mediated by the electrolytic solution, the surface tension of the electrolytic solution is not affected by the action of gas phase removal / impregnation.・ Viscosity became a resistance, and a sufficient effect was not obtained. Also, even if vibration is applied to remove the gas phase between the electrodes, a large effect cannot be obtained due to the resistance,
There is a problem that it takes time to inject a predetermined amount of the electrolytic solution, and the workability is poor.

The present invention has been made in view of the above problems. Its purpose is to make it possible to inject a predetermined amount of electrolyte at a time, and to significantly reduce the time required for liquid permeation, thereby improving the workability of battery manufacture and improving the performance reliability of batteries. An object of the present invention is to provide an electrolyte injection method and an electrolyte injection apparatus. Further, other objects will be clarified sequentially in the contents described below.

[0006]

In order to achieve the above object, the present invention provides a method for injecting an electrolyte into a battery container having an opening at one end through an opening. While having a liquid injection port on the upper side and storing the electrolyte with a margin inside, using an injection tank having an electrolyte discharge port, the battery container and the injection tank,
A connection step of communicatively connecting through the opening and the electrolyte outlet, a vacuum evacuation step of sucking and removing gas in the battery container and the injection tank through the electrolyte inlet, and A posture switching step of rotating and switching the battery container and the injection tank from a substantially horizontal position to a substantially vertical position so as to be positioned below the injection tank and to allow the electrolyte in the injection tank to flow into the battery container; And pressurizing the inside of the injection tank through the electrolyte injection port, applying a pressure to the electrolyte, and injecting the electrolyte into the battery container from the injection tank side.

[0007] According to the above structure, when the battery container is connected to the injection tank containing the required amount of electrolyte, the electrolyte in the injection tank is prevented from flowing into the battery container. Then, the inside of the battery container and the inside of the injection tank are deaerated directly without passing through the electrolytic solution, and then the battery container and the injection tank are raised from a substantially horizontal position to a substantially vertical position so that the battery container is on the lower side, and the injection tank is The electrolytic solution in the inside is injected into the battery container from the electrolytic solution outlet with pressurization. In other words, in this injection mode, the battery container and the injection tank are placed in a substantially horizontal position, and the inside of each is degassed. Then, the battery container and the injection tank are raised in a substantially vertical position, and the battery is passed through the electrolyte discharge port while pressurizing the electrolyte in the injection tank. Injection into the container. At the time of pressurized injection, the battery container is in a predetermined vacuum state up to the inside of the electrode by degassing first. Often done.

[0008] Further, according to the present invention, an apparatus for injecting an electrolyte into a battery container having an opening at one end side in a battery container in the battery manufacturing, wherein the electrolyte injection port is provided on the upper side. Having an electrolyte discharge port provided so as to be located above the liquid amount in a state in which the required amount of the electrolytic solution is stored inside through the electrolyte inlet, and the battery container An injection tank that is communicably connected to the opening, a sealable chamber that houses and arranges the battery container and the injection tank, an opening of the battery container, and an electrolyte outlet of the injection tank. Vacuum evacuation means for sucking and removing gas in the battery container and the injection tank from the communicating state, and substantially water in the battery container and the injection tank so that the electrolyte in the injection tank flows into the battery container. A posture switching means for switching to a substantially vertical position from the position, which is the generally configured to include a pressurizing means for pressurizing the inside of said injection tank is switched in a vertical position.

According to the above structure, when the battery container and the filling tank are laid in a substantially horizontal state and the gas in the chamber is suctioned and removed, the degassing in the battery container and the filling tank without the intermediary of the electrolytic solution is achieved. It is possible to do. Thereafter, the battery is raised in a substantially vertical state, and the electrolyte in the injection tank is injected into the battery container through the electrolyte outlet, and the electrolyte is injected under pressure when the injection is performed. As for the filling mode, the battery container is vacuumed enough to reach the inside of the electrode by degassing, so the injection and impregnation of the electrolyte is performed smoothly by pressurization, shortening the filling time and shortening the liquid penetration time Can be greatly improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is a preferred specific example of the present invention and includes various technically preferable limitations, but does not limit the technical scope of the present invention.

FIGS. 1 to 5 show an electrolytic solution injection apparatus to which the present invention is applied, for each step of injecting an electrolytic solution into a battery can as a battery container. In the following description, after the structure of the device is described, an electrolytic solution injection method using the device will be described. The electrolyte injection device 1 according to the embodiment includes a battery can 1
8 and chamber 11 housing and dispensing the injection tank 20
And a vacuum pumping means 3 capable of evacuating the inside of the chamber 11, a pressurizing means 4 capable of pressurizing the inside of the chamber 11, and An electrolytic solution supply means 5 which is disposed and can supply an appropriate amount of the electrolytic solution into the injection tank 2 is provided as a set.

The chamber 11 is made rugged so as to withstand internal pressure changes, has an opening 13 with a lid 12 on the upper surface side, and has a posture switching means 2 on one lower side. I have. The opening and closing of the lid 12 is performed by driving a cylinder 14, and when closed, the inside of the chamber 11 is completely sealed. The attitude switching means 2 includes the chamber 1
1 comprises a shaft 15 protruding from the side surface, a motor 16 and the like, and rotates the chamber 11 integrally with the shaft 15 by about 90 degrees from a horizontal position shown in FIGS. 1 to 4 to a vertical position shown in FIG. Things. In this structure, the motor 1
6 is received by the shaft 15 via the power transmission belt 17 and the shaft 15 rotates. Of course, other rotation mechanisms may be used.

In the chamber 11, a cell holder 19 for positioning a battery can 18 as a battery container is provided.
And an injection tank 20 for storing an electrolyte solution for one battery, a guide 21 for holding the injection tank 20 and moving it back and forth, and displacing the injection tank 20 at a constant stroke in the discharge position (see FIGS. 3 to 5). A cylinder 22 that reciprocates between a supply position (the position shown in FIG. 1) and a supply position (the position shown in FIGS. 1 and 2) is provided. Here, the battery can 18 may have a cylindrical or square outer shape, and a plurality of plate-like electrodes 23 are stacked inside the battery can 18 with a slight gap therebetween as shown in FIG. Are located. In addition, the battery can 18 has an opening 24 in the center of the front surface thereof, and an electrolyte is injected into the inside through the opening 24. The injection tank 20 has an electrolyte outlet 25 at a position corresponding to the opening 24 of the battery can 18.
In addition, an electrolyte inlet 26 is provided on the upper surface of the injection tank 20 at a location near the end opposite to the end where the electrolyte outlet 25 is provided. That is, the injection tank 20 has an electrolyte injection port 26 on the upper side of the tank, and forms a space in the tank in a state in which a necessary amount of the electrolyte is stored inside through the electrolyte injection port 26. It is important to provide the electrolyte outlet 26 at a location corresponding to the space (that is, a location located above the required amount of the electrolyte). Then, the electrolyte for one battery is injected into the injection tank 20 through the electrolyte injection port 26 by the electrolyte supply means 5 described later.

The opening 24 of the battery can 18 and the injection tank 20
When the injection tank 20 is moved to the discharge position by driving the cylinder 22, and is brought into contact with the battery can 18, the electrolyte discharge port 25 is tightly connected to each other, and the chamber 11 is moved to the vertical position while maintaining this connection. When rotated, the electrolyte in the injection tank 20 can be transferred to the battery can 18 through the electrolyte outlet 25 and the opening 24. In addition, injection tank 2
In 0, the chamber 11 is injected in a state where it is lying in a horizontal position, so that even if an electrolyte for one battery is injected, the electrolyte does not flow out from the electrolyte outlet 25.
As shown in FIG. 6, the electrolyte outlet 25 is located above the position where the electrolyte is stored. On the other hand, the electrolyte injection port 26 is rotated from the horizontal position to the vertical position in a state where the electrolyte for one battery is placed in the injection tank 20, and the injection tank 20 is integrated with the horizontal position ( Even when rotated from the position shown in FIGS. 1 to 4) to the vertical position (the position shown in FIG. 5), the position is always set above the electrolyte solution level.

The chamber 11 is connected to a vacuum exhaust unit 3 and a pressurizing unit 4 via a pipe 27.
The evacuation means 3 comprises a vacuum pump 28 and a valve 30, and the pressurizing means 4 comprises a pressurizing pump 29 and a valve 31. That is, the valve 30 is provided between the chamber 11 and the vacuum pump 28, and the chamber 11 and the pressure pump 2
The valve 31 is disposed between the valve 31 and the valve 9. The vacuum pump 28 closes the opening 13 with the lid 12 and the valve 31
When the operation is performed with the valve closed and the valve 30 opened, the inside of the chamber 11 can be evacuated. When the pressure pump 29 is operated with the opening 13 closed by the lid 12, the valve 30 closed, and the valve 31 opened, the pressure in the chamber 11 can be reduced to a vacuum state.

Further, outside the chamber 11, the opening 1
In the position corresponding to 3, the injection tank 2 in the chamber 11
Electrolyte supply means 5 for supplying the electrolyte to 0 is provided. The electrolytic solution supply means 5 has a nozzle 32 and a cylinder 33. The nozzle 32 is mounted and held on a cylinder 33, and communicates with an electrolyte storage tank 35 via a pipe 34. The nozzle 32 is arranged such that the injection tank 20 is located at the supply position and the lid 1 of the opening 13 is
When the cylinder 2 is moved forward by the drive of the cylinder 33 in the opened state, the nozzle tip side becomes the opening 13 and the electrolytic injection port 26.
To the injection position (the position in the state shown in FIG. 2) inserted into the injection tank 20 through the injection tank 20. Usually, it is arranged at the non-injection position (the position in the state shown in FIGS. 1, 3 and 4) drawn out of the chamber 11. Tank 35
Is to store the electrolytic solution to be supplied a predetermined number of times (for several times the number of batteries) to the injection tank 20. In the middle of the pipe 34, the electrolytic solution in the tank 35 is supplied to the nozzle 32 every time in a constant amount. A cylinder-type precision pump 36 having a measuring function capable of performing the measurement is provided.

Next, the operation of the thus configured electrolyte injection apparatus will be described. First, a battery can 18 into which an electrolyte is injected is set in the cell holder 19. In this case, the chamber 11 is arranged at a horizontal position as shown in FIG. 1, and the injection tank 20 is also arranged at the supply position. The lid 12 for closing the chamber is opened by the reciprocating operation of the cylinder 14, and the nozzle 3 is opened by the reciprocating operation of the cylinder 33.
2 is advanced to the injection position through the opening 13 and the electrolyte inlet 26, and the tip is inserted into the injection tank 20 (see FIG. 2). Next, the pump 36 is operated and the tank 3 is operated.
5 is injected into the injection tank 20 through the nozzle 32 by the amount of one battery.

After the electrolyte is injected, the nozzle 32 retreats to the non-injection position by the reciprocating operation of the cylinder 33, and the lid 12 for closing the chamber is also opened by the reciprocating operation of the cylinder 14.
Close. The injection tank 20 moves on the guide 21 to the discharge position by the reciprocating operation of the cylinder 22, and closely connects the electrolyte discharge port 25 to the opening 24 of the battery can 18 fixed on the cell honda 19 (see FIG. 3). ). Here, the injection tank 20 into which the electrolytic solution has been injected and the battery can 18 (electrodes therein), and the level of the electrolytic solution and the opening 2 of the battery can 18
FIG. 6 shows the position (height) relationship with the position No. 4. The important point here is that the electrolyte 24 does not block the opening 24 of the battery can 18.

Next, in the closed chamber 11,
With the valve 31 closed and the valve 30 open, the vacuum pump 28 is operated to create a vacuum in the chamber 11. This state is shown in FIG. When the vacuum pump 28 is operated, the inside of the injection tank 20 is also in a vacuum state. At this time, the vacuum directly acts on the inside (between the electrodes) of the battery can 18 tightly connected to the injection tank 20. Thus, a vacuum state (degassing) is obtained between the electrodes.

Next, the motor 16 is operated and the belt 17 is driven.
To rotate the chamber 11 together with the shaft 15 from the horizontal position to the vertical position. FIG. 5 shows a state after being rotated from the state of FIG. 4 to the vertical position. In this state, the battery can 18 is arranged below the injection tank 20 and the electrolyte in the injection tank 20 is drained. It flows into the battery can 18 through the outlet 25 and the opening 24. At the same time as the position of the chamber 11 is switched, the valve 30 is closed, the valve 31 is opened, and the pressurizing pump 29 is operated to create a pressurized state in the chamber 11. Then, since the vacuum state has reached the inside of the electrode (battery can 18) in the previous vacuum state, injection of the electrolytic solution is performed by this pressurization.
Impregnation is performed efficiently.

After all the electrolyte in the injection tank 20 has been injected into the battery can 18, the operation of the pressurizing pump 29 is stopped, the pressure is reduced, and the battery can 18 into which the electrolyte has been injected is taken out. , One cycle ends. Subsequently, another battery can 18 into which the electrolyte has not been injected is set, and the same operation is repeated to obtain the battery can 18 into which the electrolyte has been successively injected.

Therefore, in the structure of the electrolyte injection device 1 of the above embodiment, the battery can 18 (battery container) and the injection tank 20 are evacuated by the vacuum pump 28 without the intermediation of the electrolyte, and thereafter the injection is performed. Since the electrolytic solution in the tank 20 is injected into the battery can 18 through the electrolytic solution outlet 25, and the injection is performed by pressurizing the inside of the chamber 11 with the pressurizing pump 29 when performing the injection, the following operation is performed. The effect is achieved. First, when the inside of the battery can 1 is degassed, the inside of the battery can 1 is efficiently evacuated including the gap between the electrodes by the evacuation operation (vacuum operation) of the evacuation means 3 without receiving the resistance of the electrolytic solution. And a high vacuum state can be created at high speed. Second,
At the time of injection into the battery can 1, it is possible to shorten the injection time of the electrolytic solution and the liquid permeation time, and at the same time, to improve the performance reliability of the battery. Third, since the evacuation unit 3 and the pressurizing unit 4 are operated only once each, the operation efficiency and simplification of the system can be achieved. 4th
In addition, since the effect of impregnation between the electrode plates is enhanced, the standing time until charging can be reduced, and the work-in process of the battery production line can be significantly reduced.

The apparatus 1 itself includes an injection tank 2
0, a chamber 11, an attitude switching means 2, an evacuation means 3, a pressurization means 4, and an electrolyte supply means 5, all of which are simple and can be used by transforming general-purpose products. Therefore, it can be realized with reduced production costs. In this embodiment, the posture switching means 2 includes the battery can 18 and the injection tank 2.
0 is switched by rotating the entire chamber 11, so that there is an advantage that the switching operation, control, and the like are simplified. The evacuation unit 3 and the pressurizing unit 4 suck and remove gas in the battery container 18 and the injection tank 20 and pressurize the injection tank 20 through the electrolytic solution inlet 26 of the chamber 11 and the injection tank 20. Therefore, there is an advantage that the operation switching can be easily performed and the control can be simplified. Opening 13 in which chamber 11 is opened and closed by lid 12
And the necessary amount of electrolyte can be supplied into the injection tank 20 from the electrolyte supply means 5 disposed outside through the opening 13 and the electrolyte injection port 26. There is an advantage that the automatic supply of the electrolytic solution can be easily realized. These device elements can be modified or improved in detail based on this mode. Further, in the above-described embodiment, the case where a lithium ion battery is used as the battery has been described. However, the present invention can be generally applied to batteries having a structure in which an electrolyte is contained in a battery container.

[0024]

As described above, in the electrolyte injection method of the present invention, the inside of the battery container and the interior of the injection tank are degassed without intervening the electrolyte, and then the electrolyte in the injection tank is drained. Injects into the battery container through the outlet and pressurizes the electrolyte when performing the injection, so that the entire inside of the battery container is efficiently formed into a high vacuum state, shortening the electrolyte injection time And the liquid permeation time is shortened. Further, in the electrolyte injection apparatus of the present invention, the above-described injection method can be realized with a relatively simple configuration including an injection tank, a chamber, a vacuum exhaust unit, a posture switching unit, and a pressurizing unit. Performance reliability (particularly, performance due to enhanced effect of electrolyte injection and impregnation between electrode plates)
Can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an electrolyte injection device to which the present invention is applied.

FIG. 2 is a schematic configuration diagram showing the above-described apparatus in different modes.

FIG. 3 is a schematic structural layout view showing the above-mentioned apparatus in a mode of a connecting step.

FIG. 4 is a schematic configuration diagram showing the above-described apparatus in a vacuum evacuation step.

FIG. 5 is a schematic view showing the apparatus in an attitude switching step and a pressing step.

FIG. 6 is a diagram showing a relationship between a liquid level of an electrolytic solution of the above device and an opening of a battery can.

[Explanation of symbols]

1 is an electrolyte injection device, 2 is a posture switching means, 3 is a vacuum exhaust means, 4 is a pressurizing means, 5 is an electrolyte supply means, 11 is a chamber, 12 is a lid, 13 is an opening, 15 is a shaft, 16
Is a motor, 18 is a battery can (battery container), 20 is an injection tank, 23 is an electrode, 24 is an opening, 25 is an electrolyte outlet,
26 is an electrolyte inlet, 28 is a vacuum pump, 29 is a pressure pump.

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[Procedure amendment]

[Submission date] July 12, 1999 (1999.7.1)
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007] According to the above structure, when the battery container is connected to the injection tank containing the required amount of electrolyte, the electrolyte in the injection tank is prevented from flowing into the battery container. Then, the inside of the battery container and the inside of the injection tank are deaerated directly without passing through the electrolytic solution, and then the battery container and the injection tank are raised from a substantially horizontal position to a substantially vertical position so that the battery container is on the lower side, and the injection tank is The electrolytic solution in the inside is injected into the battery container from the electrolytic solution outlet with pressurization. In other words, in this injection mode, the battery container and the injection tank are placed in a substantially horizontal position, and the inside of each is degassed. Then, the battery container and the injection tank are raised in a substantially vertical position, and the battery is passed through the electrolyte discharge port while pressurizing the electrolyte in the injection tank. It is to be injected into the container, and at the time of pressurized injection, the battery container is in a predetermined vacuum state up to the gap between the electrodes due to the previous degassing, so the injection and impregnation of the electrolyte is in an ideal state It is performed efficiently.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

According to the above structure, when the battery container and the filling tank are laid in a substantially horizontal state and the gas in the chamber is suctioned and removed, the degassing in the battery container and the filling tank without the intermediary of the electrolytic solution is achieved. It is possible to do. Thereafter, the battery is raised in a substantially vertical state, and the electrolyte in the injection tank is injected into the battery container through the electrolyte outlet, and the electrolyte is injected under pressure when the injection is performed. As for the filling mode, the battery container is vacuumed enough to reach the gap between the electrodes by degassing, so that the injection and impregnation of the electrolytic solution are performed smoothly by pressurization, shortening the filling time and shortening the liquid penetration time. Significant reduction can be achieved.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

Therefore, in the structure of the electrolyte injection device 1 of the above embodiment, the battery can 18 (battery container) and the injection tank 20 are evacuated by the vacuum pump 28 without the intermediation of the electrolyte, and thereafter the injection is performed. Since the electrolytic solution in the tank 20 is injected into the battery can 18 through the electrolytic solution outlet 25, and the injection is performed by pressurizing the inside of the chamber 11 with the pressurizing pump 29 when performing the injection, the following operation is performed. The effect is achieved. First, when the inside of the battery can 18 is degassed, the inside of the battery can 18 is efficiently evacuated including the gap between the electrodes by the evacuation operation (vacuum operation) of the evacuation means 3 without receiving the resistance of the electrolytic solution. And a high vacuum state can be created at high speed. Second
In addition, at the time of injection into the battery can 18 , it is possible to shorten the injection time of the electrolytic solution and the liquid permeation time, and at the same time, to improve the performance reliability of the battery. Third, since the evacuation unit 3 and the pressurizing unit 4 are operated only once, respectively, the operation efficiency and simplification of the system can be achieved. Fourth, the effect of impregnation between the electrode plates is enhanced, so that the standing time until charging can be shortened, and the work-in process of the battery production line can be greatly reduced.

Claims (5)

[Claims] 1. An electrolytic solution injection method for producing a battery in which an electrolytic solution is injected into a battery container having an opening at one end side, wherein the electrolytic solution is injected into the battery container through the opening so that the electrolytic solution is provided inside the battery container. A connection step of using an injection tank having an electrolyte outlet and storing and holding the battery container and the injection tank so as to be able to communicate with each other through the electrolyte outlet and the opening; and A vacuum evacuation step of sucking and removing the gas in the battery container and the injection tank through an inlet; and positioning the battery container below the injection tank, and placing the electrolyte in the injection tank into the battery container. A posture switching step of rotating and switching the battery container and the injection tank from a substantially horizontal position to a substantially vertical position so as to flow, and pressurizing the inside of the injection tank through the electrolyte injection port,
A pressure step of applying pressure to the electrolyte solution to inject the electrolyte solution into the battery container from the injection tank side. 2. An electrolytic solution injection device for producing a battery, wherein an electrolytic solution is injected from the opening into a battery container having an opening at one end, wherein the electrolytic solution injecting port is provided on an upper side. In the state where the required amount of electrolyte is stored therein, the battery has an electrolyte outlet provided to be located above the amount of electrolyte, and is connected to be communicable with the opening of the battery container. An injection tank, a sealable chamber that houses and arranges the battery container and the injection tank, and a state in which an opening of the battery container communicates with an electrolyte outlet of the injection tank. Vacuum evacuation means for sucking and removing the gas in the injection tank; and switching the battery container and the injection tank from a substantially horizontal position to a substantially vertical position so that the electrolyte in the injection tank flows into the battery container. And a pressurizing means for pressurizing the inside of the pouring tank switched to the substantially vertical position. 3. The apparatus according to claim 2, wherein said attitude switching means has a drive mechanism such as a motor for switching the attitude by rotating the entire chamber. 4. The vacuum evacuation unit and the pressurization unit,
4. The electrolyte injection in the battery production according to claim 2, wherein the gas in the battery container and the injection tank is removed by suction or the pressure in the injection tank is increased through the electrolyte injection port in the chamber and the injection tank. 5. apparatus. 5. The chamber has an opening that can be opened and closed by a lid, and a required amount of electrolyte is supplied from an externally provided electrolyte supply means into the injection tank through the opening and the electrolyte injection port. The electrolyte injection device in battery production according to any one of claims 2 to 4, wherein the electrolyte injection device is capable of supplying.