JP4291194B2 - Liquid impregnation method and liquid impregnation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily and surely injecting an electrolyte into a container, while easily and surely eliminating air bubbles from an electrochemical element. <P>SOLUTION: This liquid impregnation method includes a decompression process for eliminating gas present in pores in the electrochemical element by decompressing the inside of a container with the electrochemical element set therein; an injection process for injecting the electrolyte into the container which is held in a decompression environment by the decompression process, so that at least the electrochemical element is dipped in the electrolyte; and then a pressurization process for pressurizing the inside of the container after the electrochemical element has been dipped in the electrolyte by the injection process, so that the electrolyte impregnates the electrochemical element from the outer surface of the element under a uniform pressure. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a liquid impregnation method and a liquid impregnation apparatus, and more particularly, to a method for impregnating an electrolytic solution into an electrochemical element used in an electrochemical device such as a battery or a capacitor used in an electronic device and the like, and the method. Relates to the device.

  Secondary batteries such as lithium ion secondary batteries and polymer batteries are used as power sources for electronic devices such as mobile phones, notebook computers, and digital cameras. In addition, power supply backup for portable devices, power backup for memory and clock functions of printers, remote controllers, memory cards, game machines, etc. and instantaneous voltage drop compensation devices, as well as auxiliary power supplies for hybrid vehicles, cogeneration, etc. An electric double layer capacitor is used as an application.

  Secondary batteries and electric double layer capacitors include an electrode winding type and an electrode laminated type. The electrode winding type is a three-dimensional type, whereas the electrode laminated type can reduce the thickness. In addition, the electrode laminate type eliminates the need for a metal can and contributes to a reduction in cost and weight. For this reason, the electrode stack type is widely used for applications requiring space saving.

  The electrode-stacked secondary battery is a laminate formed by laminating a positive electrode and a negative electrode so that a separator is sandwiched between them, and the laminate is impregnated with an electrolyte solution and stored in an outer bag such as an aluminum laminate, Manufactured by sealing.

  On the other hand, an electrode laminated type electric double layer capacitor is manufactured in the same process as an electrode laminated type secondary battery, and a laminated body is formed by laminating so that polarizable electrodes face each other through a separator. The laminate is impregnated with an electrolytic solution and stored in an aluminum laminate outer bag and sealed. Since the electric double layer capacitor is charged and discharged by adsorption and desorption of ions, unlike a secondary battery, there is no chemical reaction and the electrolyte solution is hardly deteriorated and has a very long life. Because of these characteristics, a plurality of electric double layer capacitors manufactured as described above are connected in series and used as an auxiliary power source for hybrid vehicles, cogeneration, and the like.

  Electrodes are used in the electrodes and separators used in the above secondary batteries and electric double layer capacitors. A general method for impregnating an electrolytic solution is to insert an electrochemical element that is a laminate or a wound body into an outer bag such as an aluminum laminate, inject the electrolyte into the outer bag with a nozzle or the like from an opening, The separator is impregnated with an electrolytic solution.

  FIG. 6 shows a configuration of a conventional electrolytic solution impregnation apparatus. This is a secondary battery manufacturing apparatus in which a separator is sandwiched between positive and negative electrodes, wound into a roll, and placed in a battery can 605.

  A plurality of battery cans 605 are accommodated in the impregnation tank 601 via the work holder 603. A wound body including a positive electrode, a negative electrode, and a separator is disposed inside each battery can. The electrolytic solution is stored in the electrolytic solution tank 607 and is appropriately supplied into the impregnation tank 601.

  In the above configuration, a predetermined amount of electrolyte is injected from the electrolyte tank 607 into the impregnation tank 601. Next, the pressure in the impregnation tank 601 is reduced to remove the air in the battery can. Further, the battery can 605 is inverted and immersed in the electrolyte so as to reach 5 to 10 mm above the opening 605a.

  Then, air is sent into the impregnation tank 601 to pressurize the electrolyte. Then, the electrolyte enters the battery can 605 in a reduced pressure state, and the wound body is impregnated with the electrolyte (see Patent Document 1).

  Next, another conventional impregnation apparatus will be described. FIG. 7 shows the impregnation profile. In this impregnation apparatus, a plurality of battery can containers are provided on a rotatable index table, the index table is rotated, and the impregnation process is performed individually for each battery can container. A wound body made up of a positive electrode, a negative electrode, and a separator is accommodated in the battery can container. In the above configuration, the impregnation operation is performed as follows using the pressure difference.

First, an electrolyte solution is poured into a battery can container that accommodates the wound body until a predetermined amount is reached (time point t1). Thereafter, the battery can is placed in the chamber. The impregnation process is started by vacuum suction in the chamber (time t2). The chamber is maintained at -60 cmHg for 16 seconds, and the chamber is opened at time t3. Further, air is supplied into the liquid impregnation container (time t4), and the pressure inside the chamber is set to 5 kg / cm ² . The pressurized state is maintained for 56 seconds (time t5). Thereafter, the chamber is opened to complete the impregnation of the sheet winding member inside the battery can of the electrolytic solution (time t6) (see Patent Document 2).
JP-A-5-94816 (paragraph number [0011] to paragraph number [0016], FIG. 1) JP-A-8-250107 (paragraph number [0028] to paragraph number [0037], FIG. 10)

  In the impregnation apparatus of FIG. 6, since the electrolyte flows only from one end side (opening end side) of the battery can, it takes a long time to impregnate the electrolyte to the bottom side region (upper part in the figure) of the battery can. There was a tendency to require.

  Furthermore, an operation for discharging the excess electrolyte in the battery can and an operation for removing the electrolyte attached to the opening of the battery can are necessary, and it is difficult to simplify the impregnation operation.

  On the other hand, in the impregnation profile of FIG. 7, since the impregnation operation is performed in a state where the electrolyte exists around the wound body, it is difficult to remove air bubbles from the voids of the wound body.

  Further, in the apparatus used for the impregnation profile of FIG. 7, a plurality of chambers for performing the impregnation step are provided, one battery can is disposed in one chamber, and the electrolytic solution is individually injected into each chamber. Therefore, it is necessary to suck and depressurize the inside of each chamber and control the amount of liquid injection, the internal pressure, etc. for each chamber, which complicates the entire liquid impregnation apparatus and makes it difficult to reduce costs.

  Therefore, the present invention can remove gas from the voids of the electrochemical element such as a wound body or a laminate, shorten the time required for impregnation, and in the impregnated electrochemical element, a portion of each electrochemical element. It is an object of the present invention to provide a simple and inexpensive liquid impregnation method and liquid impregnation apparatus that can achieve a uniform impregnation amount regardless of the above.

One aspect of the liquid impregnation method of the present invention includes a depressurization step of depressurizing the inside of the container in which the electrochemical element before being stored in the outer bag is set, and removing the gas present in the gap of the electrochemical element, and a depressurization step. in the container in the reduced pressure environment, a liquid injection step of pre-Symbol electrochemical device injects electrolyte as immersed in the electrolyte bath, the electrochemical device into the electrolyte bath by the injecting operation And the pressurizing step of pressurizing the container and impregnating the electrolytic solution into the electrochemical element after the immersion.

  In the above method, since the electrochemical element is submerged in the electrolytic solution, a uniform liquid pressure is applied to the electrochemical element. Therefore, the electrochemical element can be uniformly impregnated with the electrolytic solution in a short time. Further, since the electrolytic solution is injected into the liquid-impregnated container under a reduced pressure environment, the electrolytic solution can be injected without using a pump.

One aspect of the liquid impregnation apparatus of the present invention is a liquid impregnation apparatus used for impregnating an electrochemical element with an electrolytic solution, and the liquid impregnation apparatus has an opening for setting the electrochemical element. A container body that stores the electrolyte solution, a lid that covers the opening and makes the inside of the container body a sealed space, and a clamping mechanism, and the clamping mechanism engages with the container body. And a link mechanism that transmits a biasing force that connects to the clamp claw and biases the clamp claw in the direction of the lid, and one end connected to the link mechanism and the other end connected to the lid . generating the biasing force has a biasing force generating means, wherein the link mechanism, the link a (212), the link B (215) has a bracket (213), said bracket (213) is the lid It is fixed to the section, the link One end of (212) is connected to the biasing force generating means, the other end of the link A (212) is connected to one end of the link B (215), and the other end of the link B (215) is the clamp claw (217), one end of the clamp claw (217) is connected to the end of the bracket (213), and the clamp claw is connected to the other end of the biasing force generating means via the link mechanism. Is applied to the container body, and the lid is fastened to the container body between the clamp claw and the bracket .

  In the present invention, the electrochemical element means a sheet-like laminate in which a positive electrode, a negative electrode, and a separator are laminated, and a wound body in which a positive electrode, a negative electrode, and a separator are wound in a roll shape. Moreover, an electrochemical device means electronic components, such as a capacitor provided with an electrochemical element and a battery.

  The biasing force generating means of the present invention means a hydraulic cylinder, a pneumatic cylinder, an electric motor, and the like.

  According to the liquid impregnation method of the present invention, an electrochemical element is set in a liquid-impregnated container in which no electrolyte is present, and the pressure in the container is reduced, so that bubbles can be efficiently and easily removed from voids in the electrochemical element. It is. In addition, after the bubbles are removed from the voids of the laminate, the impregnation is performed by impregnating the electrolyte by further pressurizing the electrolyte in a state where no bubbles are present on the surface. it can. Furthermore, since the electrochemical element is impregnated in the state of being submerged in the liquid, the individual electrochemical elements are uniformly impregnated. Therefore, a certain amount of electrolytic solution can be impregnated for each electrochemical element, and an electrochemical element having desired performance can be obtained.

  Since the impregnation step and the sealing step for accommodating the electrochemical element in the outer bag are separate steps, there is no need to provide a step for removing the electrolyte attached to the sealing region of the outer bag, and the electrochemical element is used. The manufacturing process of products such as capacitors and batteries can be simplified.

  Since multiple electrochemical elements are impregnated with a single liquid impregnation vessel, the occurrence of individual differences can be prevented compared to impregnating each electrochemical element individually with an electrolytic solution, and product performance can be made uniform. Can be achieved.

  Further, since the electrolytic solution is injected in an environment where the liquid impregnation container is under reduced pressure, it is not necessary to provide a pump for performing the injection, and the configuration of the entire impregnation apparatus can be simplified.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a liquid impregnation apparatus to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram of a liquid impregnation apparatus 1. It comprises a liquid impregnation unit 100 for impregnating an electrochemical element, that is, a laminate with an electrolytic solution, and a seal unit 300 for enclosing the laminate impregnated with the electrolytic solution in an outer bag. The liquid impregnation unit 100 includes a cartridge 101 containing a laminate, a first weight measuring unit 103 for measuring the weight of the laminate, a rotating arm 105 for transporting the laminate, and the laminate as an electrolyte. Hanger mounting portions 109 and 111 for hangers used for dipping, a mounting portion 107 for mounting the stack on the hanger, and a mounted hanger mounting for mounting the hanger with the stack mounted thereon. Part 113 and liquid impregnation containers 200 and 201 for injecting the electrolytic solution and performing the impregnation step of the laminate.

  In addition, the seal unit 300 seals the laminated body in the outer bag, the bag supply unit 301 that supplies the outer bag made of the aluminum laminated film, the laminated body container 303 that accommodates the impregnated laminated body in the outer bag. Sealing unit 304 for measuring, a second weight measuring unit 311 for measuring the weight of an outer bag containing and sealing the laminate, and magazines 313a to 313 for storing the laminate enclosed in the outer bag, Is provided.

  First, the impregnation unit 100 will be described. The cartridge 101 of the impregnation unit 100 stores a laminated body in which a predetermined number of positive electrodes, negative electrodes, and separators are stacked and integrated in a predetermined order. A first weight measuring unit 103 is provided in the vicinity of the cartridge 101. The 1st weight measurement part 103 is the structure which can measure the weight of the laminated body before making electrolyte solution impregnate.

  Further, a hanger mounting portion 107 is provided in the vicinity of the cartridge 101 for fixing the laminate to the hanger. On this stage, the laminate is mounted on the hanger by mounting means (not shown).

  Further, the rotary arm 105 for transporting the laminated body is fixed to the base 102 of the liquid impregnation unit 100 so as to be rotatable. By rotating the arm, the stacked body can be transported between the cartridge 101, the first weight measuring unit 103, and the stacked body transporting unit 104.

  The hanger mounting portions 109 and 111 are arranged in synchronization with the mounting portion 107 to the hanger, and empty hangers for fixing to the laminated body are mounted. Various types of hangers can be used, but the shape is not particularly limited as long as the stack can be securely held by a clip or the like provided on the hanger and can be suspended from the hanger.

  Furthermore, the impregnation unit 100 includes a mounted hanger placing portion 113 for placing a hanger on which the laminated body is fixed. The mounted hanger placing portion 113 has a hanger temporary placing portion 115 that conveys the hanger on which the laminated body is fixed to the liquid-impregnated containers 200 and 201. The hanger placed on the hanger temporary placement unit 115 is transported to the liquid impregnation containers 200 and 201 by a transport means (not shown).

  Since both the liquid impregnation containers 200 and 201 have the same shape and the same function, the liquid impregnation container 201 will be described. The liquid impregnation container 201 includes a container main body 204 having an upper end opened, and a lid 205 that is attached to the opening of the container main body 204 and seals the inside of the container. The configuration of the clamp mechanism 202 will be described later (see FIGS. 2 and 3).

  Further, the lid 205 is provided with a tightening mechanism, that is, a clamp mechanism 202, and the clamp claw 217 of the clamp mechanism 202 is engaged with the flange 207 of the container main body 204 to seal the container main body 204. Further, the liquid impregnation container 201 is provided with an electrolyte injection port and the like (not shown) and a gas conduction port and the like (not shown) used for reducing or pressurizing the inside of the liquid impregnation container.

  Next, the seal unit 300 will be described. The seal unit 300 includes a bag supply unit 301, a laminate housing unit 303, a seal unit 304, a second weight measurement unit 311 and magazines 313a to 313e.

  A bag supply unit 301 is disposed on the most upstream side of the seal unit 300, and an exterior bag (see reference numeral 400 in FIG. 4) made of a laminate film, which will be described later, is supplied to the laminate housing unit 303 via the conveying means 302. .

  The laminated body accommodation unit 303 is a mechanism for accommodating the laminated body impregnated with the electrolytic solution in the exterior bag supplied from the bag supply unit 301.

  A seal portion 304 is provided on the downstream side of the stacked body accommodation portion 303. The seal part 304 includes a first heat welding part 305, a second heat welding part 309 and a cooling part 307. That is, the outer bag is completely sealed through two thermal welding processes. The cooling unit 307 disposed between the first and second heat welded portions is for ensuring sealing by the first heat welded portion 305.

  Further, a second weight measuring unit 311 is provided on the downstream side of the seal unit 304, and measures the weight of the outer bag containing the laminate. Since the weight of the laminate before impregnating with the electrolytic solution is measured by the first weight measuring unit 103 described above, a predetermined amount is added to the laminate by comparing with the weight measured by the second weight measuring unit 311. Whether or not the electrolyte is impregnated can be confirmed.

  Further, magazines 313 a to 313 e for housing the laminated body included in the outer bag are provided on the most downstream side of the seal unit 300. The magazines 313a to 313 reciprocate (in the directions of arrows 315 and 317) with the apparatus for the next process, and convey the laminated body sealed in the exterior bag in the next process. That is, in the magazines 313a to 313e returned from the next process (arrow 315), the stacked body is loaded at the position of the magazine 313c in the figure, and conveyed to the next process (arrow 317).

  Next, the configuration of the clamp mechanism will be described with reference to FIGS. FIG. 2 is a front view showing an inoperative state of the clamp mechanism provided in the liquid-impregnated container. FIG. 3 is a front view showing an operating state of a clamp mechanism provided in the liquid impregnation container.

  The liquid impregnation container 201 includes a plurality of clamp mechanisms 202 having the same configuration. Therefore, one clamp mechanism 202 will be described. The clamp mechanism 202 includes urging force generation means, that is, a cylinder 209, a rod 210, a link mechanism 211, a support part 219, a solenoid valve 221, and a pressure supply tube 225. One end of the rod 210 accommodated in the cylinder 209 protrudes to the outside of the cylinder 209 and is connected to the link member of the link mechanism 211 via a pin so as to be rotatable, that is, pin-coupled. The cylinder 209 is pin-coupled to a support portion 219 that is fixed to the upper surface of the lid portion 205.

  The cylinder 209 is connected to a hydraulic or pneumatic pressure source 223 via a solenoid valve 221 by a pressure supply tube 225. Note that there is one pressure source 223, and the cylinders of the plurality of clamp mechanisms are connected to a common pressure source 223. Therefore, a uniform tightening force can be supplied to the plurality of cylinders.

  The link mechanism 211 mainly includes a link A 212, a bracket 213, a link B 215, and a clamp claw 217. One end of the link A212 is pin-connected to the end of the rod 210, and the other end of the link A212 is connected to the link B215 and the pin (215a). The link A 212 is pin-coupled to the bracket 213. The link B 213 is screwed to the upper surface of the lid portion 205. The other end of the bracket is a fulcrum (217b) of the clamp claw 217. The other end, which is the tip of the clamp claw 217, is a free end and abuts against the lower surface of the flange 207 of the container body 204. Then, the flange 207 and the lid 205 are sandwiched between the clamp pawl 217 and the bracket 213.

  The link mechanism 202 described above operates as follows. FIG. 2 shows a state where the claw 217 is separated from the flange and the clamp claw 217 is opened. From this open state to the operating state of the clamp mechanism of FIG. 3, the clamp mechanism 202 operates as follows. Pressure is supplied from the pressure source 223 through the pressure tube 225 and the solenoid valve 221 into the cylinder 209. Then, the piston (not shown) in the cylinder 209 is pushed by the pressure, and the rod 210 is pushed out. Then, the link A212 that is pin-coupled to the rod 210 rotates around the pin 212a. Then, the link B215 connected to the other end of the link A212 is rotated counterclockwise with the pin 215a as a fulcrum, and the clamp pawl 217 connected to the tip of the link B215 is rotated counterclockwise with the pin 215a as a fulcrum. Then, the clamp claw 217 and the flange 207 are engaged. The lid 205 and the flange 207 are sandwiched between the clamp claw 217 and the bracket 213 fixed to the lid 205, and the lid 205 is fastened to the flange 207. In this way, the sealed state of the liquid impregnation container 201 is achieved. The operation from the sealed state to the open state is the reverse of the operation from the open state to the sealed state described above.

  In the above embodiment, the clamp mechanism is provided on the lid and the clamp claw is provided on the container body. However, the present invention is not limited to this, and the clamp mechanism and the clamp claw are provided appropriately on either the container body or the lid. Is also possible. Furthermore, it is good also as a structure which provides a clamp mechanism in the impregnation apparatus main body 250 around the impregnation container 200,201.

  Next, the exterior bag 400 supplied from the bag supply part 301 is demonstrated using FIG. FIG. 4 is a perspective view showing a state before the exterior bag is sealed. The exterior bag 400 is made of a laminate film that is a rectangular sheet member, and is formed by folding the sheet member in half, and includes a lid portion 401 and a storage portion 403. A rectangular recess 405 for accommodating the laminated body is provided in the central region of the accommodating portion 403. The recess 405 is surrounded by a top portion 407, a bottom portion 411, and side portions 409a and b.

  The step of impregnating the laminate with the electrolytic solution using the liquid impregnation apparatus having the above configuration will be described.

  First, the laminated body accommodated in the cartridge 101 is taken out by the rotating arm 105 and conveyed to the first weight measuring unit 103. The first weight measuring unit 103 measures the weight of the laminate before impregnating with the electrolytic solution, and stores the value in a storage unit (not shown). The laminated body whose weight has been measured is conveyed again to the hanger mounting portion 107 by the rotating arm 105. In the hanger mounting portion 107, the hangers of the hanger storage portions 109 and 111 are taken out, and the laminate is mounted. A plurality of hangers on which the laminated body is mounted are prepared, and they are conveyed to the mounted hanger mounting portion 113 by the belt conveyor 108.

  Then, the laminated body mounting hanger is conveyed to the hanger temporary placement unit 115 and set therein from the liquid impregnation container 200 (201). After setting the laminated body hung on the hanger, the lid 205 (see FIGS. 2 and 3) is closed and the pressure source 223 (see FIG. 3) is operated to seal the liquid-impregnated container 201. Thereafter, the pressure in the liquid impregnation container is reduced using a suction pump (not shown). In this decompression step, bubbles and the like present in the voids of the laminate can be removed, and the problem of impeding the electrolyte solution due to the presence of air can be solved.

  After bubbles and the like are removed from the laminate, an electrolyte solution is injected. Since the inside of the liquid impregnation container 201 is in a reduced pressure state, the electrolytic solution can be easily injected into the liquid impregnation container without using a pump. The amount of the electrolytic solution is set to such an amount that the laminated body placed in the liquid-impregnated container completely sinks into the electrolytic solution.

  Further, the inside of the liquid impregnation container is pressurized. In the pressurizing step, the laminate is impregnated with the electrolytic solution by pressurizing to a predetermined pressure in the liquid impregnation vessel 201 and maintaining the state for a predetermined time. Since a plurality of laminates can be impregnated with one liquid impregnation vessel 201, the cost for the impregnation apparatus and the production cost of the product can be suppressed.

  The laminate impregnated with the electrolytic solution in the impregnation step is taken out from the liquid impregnation container 201, conveyed to the next seal unit 300, and sealed in an outer bag. First, the laminated body is placed in the laminated body accommodation unit 303. On the other hand, as shown in FIG. 4, an exterior bag 400 prepared in advance is transported from the bag supply unit 301 to the laminate housing unit 303 by the transport unit 302. Here, the laminated body is accommodated in the recess 405 of the outer bag 400 (see FIG. 4). The outer bag 400 containing the laminated body is sent to the first heat welding part 305 by the conveying means 302. In the first thermal welding part 305, the top part 407 of the housing part and the tip part of the lid part 401 are thermally welded, and the lid part 401 and the top part 407 are sealed. Next, the exterior bag is conveyed to the cooling unit 307, and the portion welded by the first heat welding unit 305 is cooled to ensure welding.

  Further, the outer bag is conveyed to the second heat welding portion 309, and the heat welding is performed between the side portions 409a and 409b of the housing portion 403 and the lid portion 401. That is, this process is a structure which welds the accommodating part 403 and the cover part 401 in two steps. As for this, the lead wire extended from the laminated body has come out from the top part 407 side of the accommodating part 403 outside. Then, it is necessary to seal the top part 407 and the cover part 401 with the lead wires interposed. In this case, irregularities are generated between the welding surfaces, and this is due to the need for a heat welding finish different from the case where the welding surfaces are substantially flat like the side portions 409a and 411b and the bottom portion 411.

  The exterior bag containing the laminated body after the two-stage heat welding process is conveyed to the second weight measuring unit 311 and measures the weight of the exterior bag including the laminated body. Here, the weight of the laminate impregnated with the electrolytic solution is measured in consideration of the weight of the outer bag. Therefore, it is determined whether or not a predetermined amount of electrolyte is impregnated in the laminate by comparing the weight measurement value in the first weight measurement unit 103 described above with the measurement value in the second weight measurement unit 311. Is done.

  As a result of the measurement, if it is determined that a predetermined amount of electrolytic solution is not impregnated in the laminate, the laminate is discharged to the defective product discharge unit 312 without being transferred to the next step. On the other hand, the outer bag containing the laminate impregnated with a predetermined amount of electrolyte is conveyed to the magazines 313a to 313e and stored in the magazines 313a to 313e.

FIG. 5 is an impregnation profile of the impregnation unit 100 of the electrolytic solution impregnation apparatus. The vertical axis represents pressure, with a positive pressure being 1 kg / cm ^{2 on a} scale, and a negative value being −10 cm / Hg on a scale. The horizontal axis indicates time, and one scale is 10 seconds.

  A laminate is set in the liquid impregnation container 201. Depressurization is started at time t1, and the pressure is decreased until the pressure becomes about −70 cm / Hg (time t2), and the pressure value is maintained for about 120 seconds (time t3). Further, an electrolyte is injected at time t3 (until time t4). After injecting the electrolytic solution, the inside of the liquid-impregnated container 201 is opened and returned to atmospheric pressure at time t4.

Further, at time t5, argon gas is injected into the liquid impregnation container 201 to pressurize the impregnation container. Then, after the pressure in the liquid impregnation container reaches approximately 2 kg / cm ² (time point t6), the pressurized state is maintained for about 60 seconds and the electrolytic solution is continuously impregnated. Then, the liquid impregnation container is opened to the atmosphere (time t7), and the impregnation operation is completed.

  In addition, although argon gas was used in the said pressurization process, it cannot be overemphasized that it can change suitably, as long as moisture does not contain moisture, such as dry nitrogen gas. Accordingly, it is not preferable to use the atmosphere because the electrolyte solution may absorb moisture in the atmosphere and cause deterioration of the characteristics of the electrolyte solution.

  In the above embodiment, two liquid impregnation containers are provided, but the present invention is not limited to this embodiment, and it goes without saying that the number of liquid impregnation containers can be appropriately changed according to the production capacity of the laminate.

  Furthermore, in the said embodiment, although the laminated body was used as an electrochemical element, it cannot be overemphasized that the intended objective of this invention is achieved even if it uses a wound body.

  The present invention can be embodied in many forms without departing from its essential characteristics. Therefore, it is needless to say that the above-described embodiments are only illustrative and do not limit the present invention.

It is a conceptual diagram of the impregnation apparatus of this invention. It is a front view which shows the state which the clamp of this invention is open. It is a front view showing the state where the clamp of the present invention is closed. It is a figure which shows the exterior bag before use used by this invention. It is a graph which shows the impregnation profile of this invention. It is a conceptual diagram of the conventional impregnation apparatus. It is a graph which shows the conventional impregnation profile.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid impregnation apparatus 100 Liquid impregnation unit 101 Cartridge 103 1st weight measurement part 105 Rotating arm 107 Hanger mounting part 109, 111 Hanger mounting part 113 Mounted hanger mounting part 115 Hanger temporary mounting part 200, 201 Liquid impregnation container 300 Seal unit 301 Bag supply unit 303 Laminate body storage unit 304 Seal unit 311 Second weight measurement unit 313a to e Magazine

Claims (2)

A liquid impregnation method for impregnating an electrochemical element with an electrolytic solution,
A depressurizing step of electrochemical device before being accommodated in the outer bag is depressurized the set container, remove the gas present in the gap of an electrochemical device,
The depressurization step wherein the container in the reduced pressure environment, as before Symbol electrochemical device is immersed in the electrolyte bath, a liquid injection step of injecting the electrolyte solution,
After immersing the electrochemical element in the electrolyte bath by the liquid injection process, pressurizing the container and impregnating the electrochemical element in the electrochemical element; and
A liquid impregnation method comprising: A liquid impregnation apparatus used for impregnating an electrochemical element with an electrolytic solution,
The liquid impregnation apparatus is
A container body having an opening for setting the electrochemical element and storing an electrolyte;
A lid that covers the opening and makes the interior of the container body a sealed space;
A tightening mechanism (202) ;
With
The tightening mechanism (202)
A clamp claw (217) that engages the container body ;
A link mechanism (211) for transmitting a biasing force connected to the clamp pawl and biasing the clamp pawl in the direction of the lid ;
One end connected to the link mechanism, thereby connecting the other end to the lid, and generates the biasing force, the biasing force generating means (209),
Have
The link mechanism includes a link A (212), a link B (215), and a bracket (213). The bracket (213) is fixed to the lid, and one end of the link A (212) has the biasing force. The other end of the link A (212) is connected to one end of the link B (215), and the other end of the link B (215) is connected to the clamp claw (217). One end of the claw (217) is connected to the end of the bracket (213), and the clamping claw is applied to the container body with the urging force of the urging force generating means (209) at the other end via the link mechanism. And the lid is tightened with respect to the container body between the clamp claw and the bracket ,
Liquid impregnation equipment.

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