KR100190831B1 - Electrolyte filling nozzle and electrolyte filling device - Google Patents

Abstract

The electrolyte injection device according to the present invention is an electrolyte injection device for injecting an electrolyte solution through a nozzle into a battery case, wherein the electrolyte solution supply passage in the front end portion of the nozzle has a small diameter portion having a first diameter, Wherein the small diameter portion and the large diameter portion are divided into an upstream side and a downstream side of the flow of the electrolyte solution, and the small diameter portion and the large diameter portion are divided into an upstream side and a downstream side of the flow of the electrolyte solution, And the large-diameter portion doubles as an outlet for the electrolyte solution of the nozzle.

In the nozzle of the present invention, the electrolytic solution scattered at the end of the small diameter portion of the electrolyte solution supply path strikes against the wall surface of the large diameter portion, so that the range of flow of the electrolyte solution is suppressed within the diameter of the large diameter portion. Since the second diameter of the large diameter portion is larger than the first diameter of the small diameter portion, the liquid pressure becomes small, and the electrolyte does not flow out from the end of the large diameter portion (the electrolyte outlet of the nozzle). As a result, a predetermined amount of electrolyte to be injected is injected into the battery case without fail.

Description

A nozzle for injecting an electrolyte into the battery case, an electrolyte injection device, an electrolyte solution metering device, and a battery manufacturing method

FIG. 1 is a cross-sectional view of a principal portion of a nozzle for injecting an electrolyte into a battery in the electrolyte injection device according to the present invention,

FIG. 2 is a view showing a configuration of an electrolyte injection device according to the present invention,

FIG. 3 is a view showing a configuration of an electrolytic solution metering device according to the present invention,

4 shows the timing of the operation of the electrolytic solution metering device of Fig. 3, Fig.

FIG. 5 is a view showing a manufacturing process of a battery according to the present invention,

FIG. 6 is a view showing a configuration of a cleaning device of a battery in a fifth step, FIG.

FIG. 7 is a view showing the details of the washing water jetting amount in the washing apparatus of FIG. 6,

FIG. 8 is a view showing a configuration of a conventional nozzle for injecting an electrolyte into a battery kettle,

FIG. 9 is a view showing a sealing surface of the battery canister. FIG.

Explanation of symbols for the main parts of the drawings

4: nozzle body 5: electrolyte supply path

5a: first part 5b: second part

5c: third part (small diameter part) 5d; Fourth

6; Tank 7: Piping

8: Nozzles 9, 12, 18: Battery Kens

11,17: Balance 11a: 17a; Measuring plate

13, 19: Battery case carrying mechanism 13 ', 19': Battery case carrying mechanism

14, 110: windshield cover 15; Weight of windshield weight

18; Battery case 19b into which electrolyte is injected 19b:

25: electrolyte injection device (process) 26: hollow body mounting device (process)

27: opening sealing device (process) 28: cleaning device (process)

29: conveying means 41: nozzle

42; Electrolyte solution conveying path 42a:

43: Battery case 43a: sealing face

111: total weight measuring unit 112: calculation control means

210: Cleaning dials 210a, 213a, 214a; Concave portion

210b, 213b, 214b: a guide bar 211; Cleaning water injection nozzle

212: Battery 213: Take-over dial

214: Drying dial 215: Hot air blowing nozzle

The present invention relates to a nozzle and an electrolyte injection device for injecting an appropriate amount of an electrolyte solution into a battery case in a battery manufacturing process.

The present invention also relates to a metering device for measuring the amount of an electrolytic solution injected with an electrolytic solution into a battery case.

The present invention also relates to a method of manufacturing a battery including a step of cleaning an electrolyte attached to a surface of a battery case when an electrolyte solution is injected into the battery case.

It is demanded in quality that the battery satisfies a predetermined amount of the electrolytic solution in the battery case. As a method for injecting an appropriate amount of the electrolyte solution into the battery case, there is a method of injecting the electrolyte solution into the battery case 43 through the nozzle 41 for a certain period of time, as shown in Fig. The nozzle 41 has a structural feature that the diameter of the electrolyte conveying path 42a at the front end portion is smaller than the diameter of the electrolyte conveying path 42 on the upstream side.

However, when a nozzle having a small diameter of the electrolyte conveying path 42a at the front end portion is used, a shape in which the electrolyte is scattered at the opening of the front end of the nozzle tends to appear. Then, the scattering of the electrolytic solution causes a situation in which the amount of the electrolyte injected into the battery case 43 is insufficient. The electrolytic solution which is scattered at the front end of the nozzle is attached to the sealing surface 43a formed at the end of the battery case 43 as shown in Fig. Such adhesion of the electrolyte to the sealing surface 43a deteriorates the adhesion between the sealing surface 43a and the sealing member, and causes leakage of the liquid.

The insufficient amount of the electrolyte to be injected causes a serious problem when a large-capacity general-purpose battery (general-purpose battery) is manufactured because the smaller the capacity of the battery is, the stronger the influence is.

In order to compensate for the insufficiency of the amount of the electrolyte to be injected, a method of increasing the supply amount of the electrolytic solution in consideration of the scattering amount of the electrolytic solution may be considered. However, it is difficult to obtain an accurate supply amount of the electrolytic solution because the degree of scattering of the electrolytic solution varies depending on the viscosity of the electrolytic solution and various other conditions. It has also been attempted to finely adjust the height of the battery case and the nozzle so that the scattered electrolyte is also injected into the battery case. However, this method makes the operations at the time of manufacture more complicated and lowers the productivity.

As another method of injecting an appropriate amount of the electrolyte solution into the battery case, there is a method of transferring a predetermined amount of electrolytic solution weighed in a weighing container from the weighing container to the battery case. However, this method has a slight difference between the amount of electrolytic solution metered and the amount of electrolytic solution injected into the battery case since a small amount of electrolytic solution always remains in the container after the electrolytic solution is transferred to the battery case. Moreover, since the residual amount of the electrolyte in the vessel differs depending on the type and viscosity of the electrolyte solution, there is no guarantee that even when the metering of the electrolyte solution is adjusted in consideration of the residual electrolyte solution, an adequate amount of the electrolyte solution can be injected into the battery case. Thus, a method is employed in which the weight of the battery case before injecting the electrolyte solution and the weight of the battery case after injecting the electrolyte solution are respectively measured, and the chargeability of the amount of the electrolyte injected into the battery case is evaluated from the difference between the measured values.

A common problem with such a conventional measuring device is that it is prone to slight delays in metering due to the influence of vibration and wind, and that a long time is required before the metering value is stabilized. Specific factors that require a long time before the measurement value becomes stable include an impact of falling when the subject is placed on a weighing dish.

However, when the electrolyte solution is injected into the battery case from the nozzle, the scattering of the electrolyte solution causes the surface of the battery case to be contaminated. Particularly, the layer of the electrolytic solution adhered to the surface of the terminal of the battery becomes a great tolerance to cause a poor contact when carrying out the charge / discharge test. For this reason, it is necessary to clean the battery before charging / discharging test.

Generally, cleaning of a battery is performed simultaneously for a plurality of batteries. In some of these batteries, an upper one hour has elapsed since the electrolyte adheres to the surface of the battery, and not much time has elapsed. The electrolytic solution adhering to the surface of the battery progressively hardens with time and the adhesion force increases, so that it becomes difficult to remove the electrolytic solution by the amount. For this reason, when a large number of cells are cleaned at the same time, it is necessary to use a special cleaning agent having a high cleaning effect or to perform cleaning with a long time.

It is an object of the present invention to provide an electrolyte injection device capable of preventing scattering of an electrolyte from a nozzle.

Another object of the present invention is to provide an electrolytic solution metering apparatus which has high metering accuracy and can shorten the time until the metered matter is stabilized after the metered metering body is placed on the metering plate.

It is still another object of the present invention to provide a small and lightweight electrolytic solution metering apparatus.

It is still another object of the present invention to provide a method of manufacturing a battery which can most efficiently perform surface cleaning of a battery without using a special detergent.

A nozzle for injecting an electrolyte solution into a battery case of the present invention is characterized in that the electrolyte solution supply path of the portion for spraying the electrolyte has a small diameter portion having a first diameter and a large diameter portion having a second diameter larger than the first diameter, Wherein the small diameter portion and the large diameter portion have a common axis and the small diameter portion and the large diameter portion are formed adjacent to the upstream side and the downstream side of the flow of the electrolyte solution, And a blow-out port of the correct solution of the nozzle.

The electrolyte injection device according to the present invention is an electrolyte injection device for injecting an electrolyte solution through a nozzle into a battery case, wherein the electrolyte solution supply passage at the front end portion of the nozzle has a small diameter portion having a first diameter, Wherein the small diameter portion and the large diameter portion have a common axis and the small diameter portion and the large diameter portion are adjacent to each other on the upstream side and the downstream side of the flow of the electrolyte solution, And the large-diameter portion has an air outlet for the electrolyte solution of the nozzle.

In the nozzle and the electrolyte injection device of the present invention, the electrolyte scattered and scattered at the end of the small diameter portion of the electrolyte solution supply path of the nozzle strikes against the wall surface of the large diameter portion, so that the scattering range of the electrolyte solution is suppressed within the diameter of the large diameter portion. Since the second diameter of the large diameter portion is larger than the first diameter of the small diameter portion, the liquid pressure becomes small, and the electrolyte does not scatter from the end of the large diameter portion (electrolyte outlet of the nozzle). As a result, a predetermined amount of electrolyte to be injected into the battery case is injected without fail.

A weighing device for an electrolytic solution according to the present invention comprises a first metering device for placing a battery case on a weighing plate and measuring the weight of the battery case and a second weighing device for measuring the weight of the battery case, Calculating means for calculating an amount of electrolyte injected into the battery case based on a metering result output from the first metering device and the second metering device; And a battery case transport mechanism provided in the metering device and the second metering device for moving the battery case to be measured horizontally with respect to the surface of the metering plate and placing the battery case on the metering plate.

The electrolytic solution metering apparatus of the present invention is the electrolytic solution metering apparatus according to claim 3, further comprising a wind guard covering the first metering apparatus and the second metering apparatus separately .

The electrolytic solution smoothing device of the present invention is the electrolytic solution metering device described in claim 3, wherein the electrolytic solution metering device comprises a wind shield cover integrally surrounding the first metering device and the second metering device And further comprising:

In the electrolytic solution metering apparatus of the present invention, since the battery case transporting mechanism moves the battery case to be measured horizontally with respect to the surface of the metering plate and places it on the metering plate, the first metering device and the second metering device It is not shocked. For this reason, in the electrolytic solution metering apparatus of the present invention, the metering value is stabilized for a longer time. Further, in the measurement value of the electrolytic solution of the present invention, since the windshield cover blocks the intrusion of the wind, metering of the first metering device and the second metering device is prevented from being wronged due to the influence of the wind.

A method of manufacturing a battery according to the present invention includes the steps of injecting an electrolyte into an opening of a battery case, sealing the opening of the battery case into which the electrolyte is injected, cleaning the battery with the opening sealed, And a step of spraying washing water onto the surface of the battery within 24 hours after the electrolyte is injected.

According to the battery manufacturing method of the present invention, the surface cleaning of the battery can be performed most efficiently without using a special cleaning agent.

(Example)

As shown in FIG. 1, an electrolyte solution supply path 5 is formed in the nozzle body 4 made of, for example, SUS303. The electrolyte supply path 5 of the front end portion of the nozzle body 4 (the portion for spraying the electrolytic solution) is provided with the first portion 5a, the second portion 5b, 3, a portion 5c (a small-diameter portion), and a fourth portion 5b (a large-diameter portion). The electrolyte supply path 5 of each part is characterized by the size of its diameter. The diameter of the first portion 5a is, for example, about 2 to 3 mm. The diameter of the third portion 5C is, for example, about 0.3 to 0.4 mm. The diameter of the fourth portion 5d having the outlet of the electrolytic solution at its end is, for example, about 3 to 4 mm. The length of the third portion 5c is, for example, about 1.5 to 2 mm. The length of the fourth portion 5d is, for example, about 1.5 to 2 mm. Each part of the electrolyte solution supply path 5 has a common axis.

FIG. 2 is a view showing a configuration of an electrolyte injection device including the above-described nozzles.

In the drawing, (6) is a tank made of a fluororesin. The tank 6 contains an alkaline electrolyte. (7) is a pipe made of fluororesin. (8) is the above nozzle. The electrolytic solution contained in the tank 6 is supplied to the nozzle 8 through the pipe 7 and injected into the battery case 9 by the nozzle 8. The distribution of the electrolytic solution from the tank 6 is opened and closed by the opening / closing mechanism 7a connected to the pipe 7.

The battery case 9 is intermittently transported by a transporting device (not shown). The opening and closing mechanism 7a is opened to supply the electrolytic solution in a predetermined period within the period in which the battery case 9 is stopped. Thereby, a predetermined amount of electrolyte is injected into the battery case 9.

Note here that the flow of the electrolytic solution in the nozzle 8 (the electrolytic solution supply path 5) during the period of injecting the electrolytic solution into the battery case 9 is noted.

Since the diameter of the electrolyte solution supply path 5 is minimized in the third portion 5c, the liquid pressure becomes largest in this third portion 5c. The excessive fluid pressure causes the electrolytic solution to fly away from the end of the third portion 5c. However, since the scattered electrolytic liquid hits the wall surface of the fourth portion 5d, the range of scattering is suppressed to within the diameter of the fourth portion 5d. Since the diameter of the fourth portion 5d is sufficiently larger than the diameter of the third portion 5c, the liquid pressure is also sufficiently small, and the electrolyte does not flow again from the end of the fourth portion 5d. As a result, a predetermined amount of the electrolytic solution to be injected is introduced into the battery case 9 without fail.

Therefore, this electrolyte injector has an advantage that an appropriate amount of electrolyte can be always injected into the battery case (9), contributing to improvement of the quality of the battery.

Next, a description will be given of a measuring apparatus for measuring the amount of electrolyte injected into the battery case. Figure 3 shows the construction of this metering device.

In the drawing, reference numeral 11 denotes a balance having a metering plate 11a on which the battery case 12 is placed. (13) is a battery case loading mechanism for loading the battery case (12) onto the metering plate (11a). (13 ') is a battery case carrying-out mechanism for carrying out the battery case (12) from the metering plate (11a). (14) is a windshield cover which surrounds the balance 11 and the battery case loading / unloading mechanisms 13, 13 '. These constitute a windshield weight measuring section (first metering apparatus) 15 for measuring the weight of the battery case (windshield).

The battery case carrying-in mechanism 13 is constituted by an air cylinder 13a and a receiving plate 13b serving as a carry-in path for the battery case 12. [ That is, the battery case carrying-in mechanism 13 is configured to move the battery case 12 in the horizontal direction with respect to the surface of the metering plate 11a. On the other hand, in the same manner as the battery case carrying-in mechanism 13, the battery case carrying-out mechanism 13 'is configured such that the battery case 12 is held by the air cylinder 13a' and the receiving plate 13b ' In the horizontal direction. The windshield cover 14 is made of a synthetic resin such as acrylic water. The windshield cover 14 has an inlet port and an outlet port for the battery case 12.

(16) is means for injecting the electrolyte solution into the battery case (12). (17) is a balance having a measurement plate (17a) on which a battery case (18) filled with an electrolyte is placed. (19) is a battery case loading station for loading the battery case (18) onto the measuring plate (17a). (19 ') is a battery case carrying-out mechanism for carrying out the battery case (18) from the metering plate (17a). (110) is a windshield cover which surrounds the balance 17 and the battery case loading / unloading mechanisms 19, 19 '. These constitute a total weight measuring section (second measuring apparatus) 111 for measuring the total weight of the battery case 18 into which the electrolyte solution is injected.

The battery case carrying-in mechanism 19 is constituted by an air cylinder 19a and a receiving plate 19b which is a carry-in path for the guide casing 18. That is, the battery case carrying-in mechanism 19 is configured to move the battery case 18 in the horizontal direction with respect to the surface of the metering plate 17a. On the other hand, in the same way as the battery case carrying-in mechanism 19, the battery case carrying-out mechanism 19 'is configured such that the battery case 18 is held by the air cylinder 19a' and the receiving plate 19b ' In the horizontal direction. The windshield cover 110 is made of synthetic resin such as acrylic resin. Also, the windshield cover 110 has an inlet port and an outlet port for the battery case 12 into which the electrolyte solution is injected.

The control unit 112 calculates the amount of the electrolyte injected into the battery case from the metering value obtained from the gross weight metering unit 111 and the metering value obtained from the windshield metering unit 15 and determines whether the amount of the electrolyte injected falls within a predetermined range Or not.

Next, the operation of the electrolytic solution metering apparatus will be described.

First, the battery case 12 (the battery case before the electrolyte is injected) is carried onto the weighing plate 11a of the balance 11 by the battery case loading mechanism 13 of the windshield weight measuring unit 15. The battery case carrying mechanism 13 is configured to move the battery case 12 in the horizontal direction with respect to the surface of the measuring plate 11a so that the battery case 12 is attached to the measuring plate 11a of the balance 11, It is possible to shorten the time required for the balance 11 to stabilize and to accurately weigh the battery case in a shorter time.

The control means 112 operates the battery case carrying-out mechanism 13 'after confirming that the weighing data is output from the windshield weight measuring section 15 as shown in FIG. The battery case carrying-out mechanism 13 'moves the battery case 12 in the horizontal direction from the metering plate 11a of the balance 11 toward the electrolyte injection means 16 so as to take out the battery case 12. [

The control means 112 sends a resume signal to the windshield weight measuring section 15 at the timing when the battery case 21 is separated from the measuring plate 11a. When the weight measuring section 15 receives the re-zero signal, the weight measuring section 15 starts the re-zero operation. When the re-zero operation is completed, the weight measuring section 15 outputs the completion signal to the control means 112, 12 to be started.

On the other hand, the electrolyte injection means 16 injects a predetermined amount of the electrolytic solution into the battery case 12 carried out from the windshield weight measuring section 15. [ The battery case 18 into which the electrolytic solution is injected is sent to the gross weight measuring unit 11. [

The battery case 18 is carried on the measuring plate 17a of the balance 17 by the battery case carrying-in mechanism 19 in the gross weight measuring unit 111. [ The battery case carrying-in mechanism 19 is configured to move the battery case 18 in the horizontal direction with respect to the face of the measuring plate 17a in the same manner as the battery case taking-in mechanism 13 provided in the windshield weight measuring section 15 The time required for the balance 17 to stabilize can be shortened and the battery case can be accurately weighed in a shorter time.

The control means 112 operates the battery case carrying-out mechanism 19 'after confirming that the weight data is output from the gross weight measuring section 111. [ The battery case carrying out mechanism 19 'takes out the battery case 18 from above the weighing plate 17a of the balance 17.

Since the weighing by the windshield weight measuring section 15 and the gross weight measuring section 111 are performed in the windshield covers 14 and 110 all of the windshield weights 11 and 17 are swung The situation does not occur. Therefore, more accurate metering can be performed efficiently.

The control means 112 calculates the amount of electrolyte injected into the battery case from the metering value obtained from the gross weight metering section 111 and the metric value obtained from the weight of the windshield weight metering section 15, It is judged whether or not it falls within the range. If the amount of the electrolyte injected does not fall within the predetermined range, the control means 112 discriminates the battery case 18 as a defective product.

The windshield weight measuring section 15 and the gross weight measuring section 111 may be integrally surrounded by a single windshield cover.

The mechanism for carrying the battery case is not limited to the air cylinder, but can be realized by an oil cylinder, a rack, and a pinion mechanism.

Next, a description will be given of a technique of cleaning the battery after the electrolyte injection and shrinkage.

FIG. 5 is a view showing a manufacturing process of a nickel-hydrogen secondary battery.

The battery case in which the electrolyte is injected in the electrolyte injection device 25 is provided with a device 26 for mounting a sealing member to the opening and an apparatus 27 for sealing the opening of the battery case with sealing (Process) 28 via a cleaning device (not shown). The transfer of the battery case between these devices is automatically performed by the mechanical transfer means (29). The time required for each of the processes (25), (26), (27), and (28) is, for example, about 10 seconds, and the time required for transportation between the processes is also about 10 seconds. Therefore, the time from the end of the step of injecting the electrolyte solution into the battery case to the start of the cleaning treatment is about 50 seconds.

FIG. 6 is a view showing a configuration of the cleaning device 28. FIG. FIG. 7 is an enlarged view of a recessed portion (jetting portion of washing water) of the cleaning device 28; FIG.

In these drawings, reference numeral 210 denotes a cleaning dial having a diameter of about 40 cm. A concave portion 210a for mounting the battery 22 is formed on the outer circumferential surface of the cleaning dial 210 and the cleaning bar 210 is provided with a guide bar 210b. (211) is a nozzle for spraying washing water to the battery (112) mounted on the washing dial (210). The interval between the nozzles 211 is, for example, 5 cm.

(213) is a take-off dial having a diameter of about 20 cm. The take-off dial 213 is for passing the battery 212 mounted on the cleaning dial 210 to the drying dial 214 (having a diameter of about 20 cm). Recesses 213a and 214a for mounting the battery 212 and guide bars 213b and 213d are provided on the outer peripheral surface of the take-over dial 213 and the drying dial 214. [

(215) is a nozzle for blowing warm air to the battery (212) mounted on the drying dial (214). The interval of each nozzle 215 is, for example, 5 cm.

Next, the operation of the cleaning apparatus will be described.

The battery 212 in which the opening is sealed is mounted on the concave portion 210a of the cleaning dial 210. The battery 212 mounted on the concave portion 210a of the cleaning dial 210 rotates in the counterclockwise direction due to the clockwise rotation of the cleaning dial 210 and the sliding contact with the guide bar 210b. At this time, the battery 21 is cleaned by the washing water jetted from the nozzle 211. The injection pressure of the washing water is, for example, 10 kg / cm 2 and the temperature is 50 ° C

The cleaned battery is returned to the drying dial 214 via the take-off dial 213. [ The battery 212 mounted on the concave portion 214a of the drying dial 214 rotates in the counterclockwise direction due to the clockwise rotation of the drying dial 214 and the sliding contact with the guide bar 214b. At this time, the surface of the battery 212 is dried by hot air blowing from the hot air spraying nozzle 215.

Since the washing and drying of the battery 212 are performed while rotating, the washing liquid and the warm air are uniformly called on the entire surface of the battery 212. As a result, the battery can be cleaned and dried without being stained.

The spraying of the washing water is preferably carried out at a pressure of 2 to 20 kg / cm 2 and a hot water of 30 to 60 캜 for about 15 to 20 seconds. The pressure is in the range of 8 to 12 kg / cm 2, 50 占 폚, and the cleaning time is more preferably in the range of 15 to 20 seconds.

The cleaning device 28 can be cleaned by receiving the battery 212 with the opening sealed at a predetermined time interval. Therefore, when the battery is configured to be mounted on the concave portion 210a of the cleaning dial 210 of the cleaning device 28 at a cycle in which the battery is transported through the mechanical transfer means 29, The elapsed time from the injection to the start of cleaning becomes constant.

The inventors of the present invention have found that excellent cleaning results can be obtained when the following elapsed time of the electrolytic solution is cleaned by using such a cleaning device and the electrolytic solution is applied within 24 hours after the adhesion. Further, it is also confirmed that, if it is within 4 hours, a cleaning result of one rank is obtained.

Specifically, in the manufacturing process of the nickel-hydrogen secondary battery, the battery which was cleaned after 50 seconds passed from the injection of the electrolytic solution was subjected to a charge / discharge test. Further, even in the result of the test of applying the phenol red on the surface of the battery which was cleaned in the same manner and observing the discoloration of the electrolytic solution, the adhesion residue of the electrolytic solution could not be observed at all.

According to the nozzle for injecting the electrolyte solution into the battery case of the present invention and the electrolyte injection device, it is possible to prevent the electrolytic solution from flying away from the outlet of the nozzle. As a result, a predetermined amount of electrolyte to be injected into the battery case Can be injected without.

According to the electrolytic solution weighing apparatus of the present invention, the first weighing device and the second weighing device are not impacted when the battery case to be weighed is placed on the surface of the weighing plate, and the weighing value can be stabilized in a shorter time have.

Further, according to the electrolytic solution metering apparatus of the present invention, metering of the first metering apparatus and the second metering apparatus does not become wrong due to the influence of wind.

According to the battery manufacturing method of the present invention, the surface cleaning of the battery can be performed most efficiently without using a special cleaning agent.

Claims (8)

In a nozzle for injecting an electrolyte into a battery case, Wherein the electrolytic solution supply path of the portion for spraying the electrolytic solution is composed of a small diameter portion having a first diameter and a large diameter portion having a second diameter larger than the first diameter, Wherein the small diameter portion and the large diameter portion have a common axis, Wherein the small-formed portion and the large-diameter portion are formed adjacent to the upstream side and the downstream side of the flow of the electrolyte solution, And the large-diameter portion has an outlet for discharging the electrolyte solution of the nozzle. An electrolyte injection device for injecting an electrolyte through a nozzle into a battery case, The electrolyte supply path of the front end portion of the nozzle is composed of a small diameter portion having a first diameter and a large diameter portion having a second diameter larger than the first diameter. Wherein the small diameter portion and the large diameter portion have a common axis, The small diameter portion and the large diameter portion are formed adjacent to the upstream side and the downstream side of the flow of the electrolyte solution, And the large-diameter portion has a blow-out port of the electrolyte of the nozzle. A first metering device for placing the battery case on a measuring plate and measuring the weight of the battery case, A second metering device which measures the weight of the battery case by placing the battery case with the electrolyte injected thereon on a metering plate, Calculating means for calculating an amount of the electrolyte injected into the battery case based on the metering results output from the first metering device and the second metering device, And a battery case transporting mechanism provided respectively in the first metering device and the second metering device for moving the battery case to be measured horizontally with respect to the metering plate surface and placing the battery case on the metering plate. Electrolyte metering device. The electrolytic solution metering device according to claim 3, further comprising a wind guard covering each of the first metering device and the second metering device separately. The electrolytic solution metering device according to claim 3, further comprising a wind guard covering the first metering device and the second metering device integrally. A step of injecting an electrolyte solution into the battery case through the opening; Sealing the opening of the battery case into which the electrolyte is injected, And washing the battery with the opening sealed therein by spraying rinse water onto the surface of the battery within 24 hours after the electrolyte is injected into the battery case. The method for manufacturing a battery according to claim 6, wherein the spraying pressure of the washing water is in the range of 2 to 20 kg / cm 2, and the temperature of the washing water is in the range of 30 to 60 ° C. The method for manufacturing a battery according to claim 6, wherein the battery is a nickel-hydrogen secondary battery.