JP4202933B2 - Electrolyte injection device and battery manufacturing method - Google Patents

Description

The present invention relates to an electrolytic solution injecting apparatus for injecting an electrolytic solution into a battery container and a method for manufacturing the battery, and particularly to an apparatus capable of performing high-precision liquid injection into a large capacity battery container in a short time.

In the conventional technique, the inside of the battery container is evacuated, and then the liquid is injected once by a fixed discharge pump (see, for example, Patent Document 1).
JP 61-171061 A

  The electrolyte solution injection method described above has the following problems. That is, the discharge accuracy of the metering pump is determined by the ratio to the pump discharge amount. For this reason, the more the pump is discharged, the worse the accuracy. For this reason, when a large amount of electrolyte is injected into a battery container having a large volume, the variation increases, and the liquid cannot be accurately injected. In addition, the liquid injection process proceeds while impregnating, and in one liquid injection, it takes much time until the impregnation is completed and finally the total amount of liquid injection is completed, and the efficiency is very poor.

Accordingly, the present invention provides an electrolyte solution injection device and a battery that can be accurately and efficiently injected even when the amount of solution injection is large when an electrolyte solution is injected into a large-capacity battery container. The object is to provide a manufacturing method .

In order to solve the above problems and achieve the object, the electrolytic solution injection device and the battery manufacturing method of the present invention are configured as follows.

(1) In an electrolyte solution injection device for injecting a first injection amount of an electrolyte into a battery container, a pre-weighing unit for measuring the weight of the battery container before injection, and a vacuum for housing the battery container A chamber, a nozzle provided in the decompression chamber and inserted into the battery container, and a large-capacity pump connected to the nozzle via a liquid injection valve, and an amount of electrolysis smaller than the first liquid injection amount an intermediate weighing unit for measuring the primary pouring unit for pouring to the battery container, the weight of the battery container the electrolyte is injected by the primary pouring part by the large pump the liquid, Based on the measurement result in the intermediate weighing unit, the second liquid injection amount actually injected by the first liquid injection unit is obtained, and the first liquid injection amount and the second liquid injection amount are obtained. and pouring amount calculation unit for calculating a third liquid injection amount which is a difference between, first calculated in the infusion amount calculating section Of the pouring amount of the electrolyte precision pump e Bei a secondary pouring unit for pouring to the battery case, the decompression chamber, upon housing the battery case, lower than atmospheric pressure, and, The pressure is reduced at a pressure higher than the saturated vapor pressure of the electrolytic solution .

( 2 ) The electrolyte solution injection device described in (1) above, further comprising a vacuum degassing defoamer that performs degassing by exposing the electrolyte solution before injection in the first injection portion to a reduced pressure state It is characterized by having.

( 3 ) The electrolyte solution injection device described in (1) above, wherein a pre-weighing unit that measures the weight of the battery container before the injection by the primary injection unit, and the second And a post-weighing unit for measuring the weight of the battery container after the liquid injection by the next liquid injection unit, and the liquid injection amount by the large-capacity pump is a measurement result in the pre-weighing unit, the post-weighing unit and the intermediate weighing unit. It is adjusted based on this.
( 4 ) It has the process of inject | pouring electrolyte solution into a battery container by the electrolyte solution injection apparatus of any one of Claims 1 thru | or ( 3 ), It is characterized by the above-mentioned.

  According to the present invention, when injecting an electrolytic solution into a large-capacity battery container, it is possible to inject the liquid accurately and efficiently even if the amount of liquid injection is large.

  FIG. 1 is a plan view showing an electrolyte solution injection device 10 according to an embodiment of the present invention, FIG. 2 is a perspective view showing a battery container W supported by a holder H, and FIG. 4 is a perspective view showing a state of being mounted on the carrier C, FIG. 4 is a cross-sectional view taken along line AA in FIG. 1 and viewed in the direction of the arrow, and FIG.

  The electrolyte solution injection device 10 includes a conveyor 11 that conveys a carrier C, which will be described later, from left to right in FIG. 1, and a return conveyor 12 that is disposed adjacent to the conveyor 11 and that conveys the carrier C from right to left in FIG. And.

  Along the conveying direction of the conveyor 11, the depalletizer 20, the pre-weighing unit 30, the four primary injection units 40, the intermediate weighing unit 50, the secondary injection unit 60, the final weighing unit 70, and the defective dispensing unit 80. A palletizer 90 is disposed. These units are linked and controlled by a control unit (a liquid injection amount calculation unit) 100.

  The depalletizer 20 has a function of taking out a battery container W supported by a holder H described later from a pallet (not shown) and transferring it to an empty carrier C. Moreover, the pre-weighing part 30 has a function which measures the weight of the battery container W before injecting electrolyte solution. The measured value M1 measured by the pre-weighing unit 30 is sent to the control unit 100.

  The primary liquid injection unit 40 includes a decompression chamber 41 that accommodates the battery container W and is open on the right side in FIG. A nozzle 42 to be inserted into the liquid injection port Wa of the battery container W is provided at the ceiling of the decompression chamber 41. A large capacity discharge pump 44 and an electrolytic solution defoaming tank 45 are connected to the nozzle 42 via a liquid injection valve 43. The large capacity discharge pump 44 discharges a constant liquid injection amount QX. Moreover, the electrolytic solution defoaming tank 45 has a function of removing bubbles in the electrolytic solution by accommodating the electrolytic solution before discharge in a decompressed space.

  A lifter cylinder 46 for lifting the battery container W together with the carrier C is attached to the bottom of the decompression chamber 41. In addition, the opening of the decompression chamber 41 is hermetically closed, and includes a shutter portion 47 that is reciprocally movable in the direction of arrow α in FIG. 4 and a shutter opening / closing cylinder 48 that reciprocates the shutter portion 47. Yes.

  The intermediate weighing unit 50 has a function of measuring the weight of the battery container W injected by the primary injection unit 40. The measurement value M2 is sent to the control unit 100.

  The secondary injection unit 60 includes a precision pump 61 that discharges the third injection amount Q <b> 3 measured by the control unit 100, and an electrolytic solution tank 62 that supplies an electrolytic solution to the precision pump 61. The precision pump 61 can control the discharge amount.

  The final weighing unit 70 has a function of measuring the weight of the battery container W injected by the secondary injection unit 60. The measurement value M3 is sent to the control unit 100.

  The defective payout unit 80 has a function of paying out the battery container W as a defective product when the weight M of the battery container W is outside the allowable range.

  The palletizer 90 has a function of taking out the battery container W supported by the holder H from the carrier C and transferring it to an empty pallet (not shown).

  The control unit 100 has a function of calculating the third injection amount Q3 in the secondary injection unit 60 as well as controlling each unit in association. The third liquid injection amount Q3 is the difference between the first liquid injection amount Q1 and the second liquid injection amount Q2.

  As shown in FIG. 2, the battery container W is formed flat, and a liquid inlet Wa is formed at the top. The amount of liquid to be injected into the battery container W is the first liquid injection amount Q1. Further, the battery container W is held by a holder H in order to prevent the container from expanding during decompression or liquid injection. Furthermore, as shown in FIG. 3, eight battery containers W are accommodated in the carrier C.

  In the electrolytic solution injection device 10 configured as described above, the electrolytic solution is injected as follows. In addition, although one battery container W is demonstrated for convenience, liquid injection is performed similarly about the other battery container W.

  First, the battery container W is taken out of the pallet by the depalletizer 20 and transferred to the empty carrier C. Then, the carrier C is transported to the pre-weighing unit 30 by the transport conveyor 11. In the pre-weighing unit 30, the weight of the battery container W is measured. The measurement value M1 is sent to the control unit 100. Then, the carrier C is transported to the first liquid injection unit 40 by the transport conveyor 11.

  In the first liquid injection part 40, the shutter opening / closing cylinder 48 is operated, the shutter part 47 is closed, and the decompression chamber 41 becomes an airtight chamber. The inside of the decompression chamber 41 is decompressed to a pressure slightly higher than the saturated vapor pressure of the electrolyte by a decompression pump (not shown). Then, the lifter cylinder 46 is operated to raise the carrier C until the nozzle 42 is inserted into the liquid injection port Wa of the battery container W. The electrolyte before injection is defoamed in the electrolyte deaeration tank 45, and then a predetermined injection amount QX is sucked into the large-capacity pump 44 and is in a standby state. The injection amount QX is set to 80% of the first injection amount Q1.

  Next, the liquid injection valve 43 is opened and the electrolytic solution is pushed out from the large capacity pump 44. The electrolyte solution of the injection amount QX is injected into the battery container W at high speed, and the electrode in the battery container W is impregnated with the electrolyte solution.

  Then, the lifter cylinder 46 is operated, the battery container W is lowered, and the inside of the decompression chamber 41 is returned to the atmospheric pressure. Next, the shutter opening / closing cylinder 48 is operated, the shutter portion 47 is opened, and the carrier C is taken out. The carrier C is transported to the intermediate weighing unit 50 by the transport conveyor 11.

  In the first liquid injection unit 40, there are processes such as transfer into the vacuum chamber 41, vacuum pulling, liquid injection, impregnation, and return to atmospheric pressure. Therefore, the same operations are performed in the four first liquid injection units 40. Are done in parallel.

  The intermediate weighing unit 50 measures the weight of the battery container W, and the measured value M2 is sent to the control unit 100. The control unit 100 calculates a second liquid injection amount Q2 actually injected based on the difference between the measurement value M1 and the measurement value M2. Then, the remaining amount up to the first liquid injection amount Q1, that is, the third liquid injection amount Q3 is calculated. The third injection amount Q3 is about 20% of the first injection amount Q1. The third liquid injection amount Q3 is sent to the second liquid injection unit 60.

  In the second liquid injection unit 60, the precision pump 61 sucks the third liquid injection amount Q3 of the electrolytic solution. A nozzle is inserted into the liquid injection port Wa of the battery container W, and the electrolytic solution of the third liquid injection amount Q3 is injected by the precision pump 61. In addition, this injection is performed under atmospheric pressure. After the liquid injection of the third liquid injection amount Q3 is completed, the carrier C is transported to the final weighing unit 70 by the transport conveyor 11.

  The final weighing unit 70 measures the weight of the battery container W, and the measured value M3 is sent to the control unit 100. The carrier C is transported to the defective payout unit 80 by the transport conveyor 11.

  In the control unit 100, a final liquid injection amount is calculated based on the measured value M3, and a difference from the above-described first liquid injection amount Q1 is obtained. If this difference is within the allowable range, it is determined that the product is non-defective, and if the difference is outside the allowable range, it is determined that the product is defective.

  In the defective delivery unit 80, the battery container W determined to be defective is transferred to a defective product pallet (not shown). The battery container W determined to be non-defective is conveyed to the palletizer 90 while being placed on the carrier C. In the palletizer 90, the battery container W is taken out from the carrier C and transferred to the pallet. The empty carrier C is conveyed to the depalletizer 20 by the return conveyor 12.

  As described above, according to the electrolyte solution injection device 10 according to the present embodiment, after the liquid is injected at high speed with the large-capacity pump 44, the weight is measured, and the insufficient amount of the electrolyte is accurately measured based on the weight. The precision pump 61 is used for liquid injection. That is, the error in the large-capacity pump 44 in the first injection is measured, and the error is fed back in the second precision pump 61 to perform high-precision injection. For this reason, even if it is a case where electrolyte solution is inject | poured with respect to the large volume battery container W, it becomes possible to inject with sufficient precision and efficiently.

  Note that the amount of liquid injected by the large-capacity pump 44 may be optimized based on the measured values M1 to M3. Moreover, although electrolyte solution was divided | segmented into 2 times and injected, you may divide | segment and inject into 3 or more times.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

According to the present invention, even when the electrolytic solution is injected into a large-capacity battery container, the electrolytic solution can be injected accurately and efficiently even if the amount of the injected solution is large. A liquid device and a battery manufacturing method are obtained.

The top view which shows the electrolyte solution injection apparatus which concerns on one embodiment of this invention. The perspective view which shows the battery container supported by the holder used with the electrolyte solution injection apparatus. The perspective view which shows the state in which the battery container and the holder were mounted in the carrier. Sectional drawing which cut | disconnected the 1st injection part integrated in the same electrolyte injection apparatus by the AA line in FIG. 1, and looked at the arrow direction. Explanatory drawing which shows the electrolyte solution injection process in the electrolyte solution injection apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Electrolyte injection apparatus, 30 ... Pre-weighing part, 40 ... Primary injection part, 41 ... Depressurization chamber, 44 ... Large capacity discharge pump, 45 ... Electrolyte deaeration tank, 50 ... Intermediate weighing part, 60 ... Secondary injection unit, 61 ... precision pump, 70 ... final weighing unit, 80 ... defective dispensing unit, 100 ... control unit, H ... holder, W ... battery container, C ... carrier.

Claims (4)

In an electrolyte injection device for injecting a first injection amount of electrolyte into a battery container,
A pre-weighing unit for measuring the weight of the battery container before injection,
A decompression chamber for accommodating the battery container, a nozzle provided in the decompression chamber and inserted into the battery container, and a large-capacity pump connected to the nozzle via a liquid injection valve. a primary pouring unit for pouring to the battery container by the large-capacity pump fewer amount of the electrolyte fluid volume,
An intermediate weighing unit for measuring the weight of the battery container into which the electrolytic solution has been injected by the primary injection unit;
Based on the measurement result in the intermediate weighing unit, the second liquid injection amount actually injected by the first liquid injection unit is obtained, and the first liquid injection amount and the second liquid injection amount are obtained. A liquid injection amount calculation unit for calculating a third liquid injection amount that is the difference between
Bei example a secondary pouring unit for pouring to the battery container by the third liquid injection amount of the electrolyte precision pump calculated by the infusion amount calculating unit,
The electrolytic solution injecting apparatus, wherein the decompression chamber is decompressed at an atmospheric pressure lower than atmospheric pressure and higher than a saturated vapor pressure of the electrolytic solution when the battery container is accommodated .   The electrolyte solution injection apparatus according to claim 1, further comprising a reduced pressure defoaming bowl that performs defoaming by exposing the electrolyte solution before injection in the first injection portion to a reduced pressure state. Before the liquid injection by the primary liquid injection unit, a pre-weighing unit for measuring the weight of the battery container,
A post-weighing unit for measuring the weight of the battery container after the liquid injection by the secondary liquid injection unit;
2. The electrolytic solution injection apparatus according to claim 1, wherein an amount of liquid injected by the large-capacity pump is adjusted based on measurement results in the pre-weighing unit, the post-weighing unit, and the intermediate weighing unit. . A method for manufacturing a battery, comprising a step of injecting an electrolyte into a battery container by the electrolyte solution injection device according to any one of claims 1 to 3 .

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