JP2010027621A - Electrochemical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: a liquid-immersing inlet-sealing structure of a conventional battery or a capacitor mounts a sealing component on a liquid-immersing member after liquid immersion, so that management of the sealing component separated and a costly and complicated sealing component mounting (welding) device are necessary, and therefore, there is a limit in VA (value analysis) for which separation of the liquid-immersion inlet member and the sealing component is a precondition. <P>SOLUTION: The sealing component is to be a simple and low-cost sealing tap, and the liquid-immersing inlet-sealing structure can immerse liquid with the sealing tap retained and can seal by simply pressing in the sealing tap into the sealing part. With this, unitization of the sealing tap and the liquid-immersing inlet member is achieved to do away with management of the component separated and a high-cost and complicated sealing component mounting (welding) device, as well as with works for supplying components to the device and for equipment maintenance. Further, the VA of the liquid-immersing inlet-sealing structure not available with the conventional structure with which the separation enables cost reduction of sealing-related components. Moreover, performance improvement of a product is to be achieved as nitrogen gas substitution, (decompressed or compressed) liquid immersion, and (decompressed) sealing can be easily carried out continuously. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

 The present invention incorporates a power generation / storage element such as an electrode plate / separator and a liquid such as an electrolyte from a liquid injection port provided in a sealed container provided with an external terminal. The present invention relates to an electrochemical device such as a battery or a capacitor obtained through a manufacturing process in which a liquid injection port is sealed after a process or before a process such as charging.

The conventional liquid inlet sealing structure of the electrochemical device such as the battery or the capacitor is from a liquid inlet provided in the sealed container or a liquid inlet of a liquid inlet member provided in the sealed container. Liquid such as electrolyte is injected, and if necessary, after the charging process, etc., or before the charging process, the sealing parts are attached to the injection port, and the injection port is injected, screwed, welded, etc. It has a structure that seals. The sealing method includes a sealed type and a non-sealed type that can always release internal gas depending on the type of product, and the sealed type is provided with a non-returnable safety valve or a return-type control valve that operates by internal pressure. In addition, there are a completely fixed type that cannot be removed and a removable type for replacement fluid in the mounting state of the sealing part. Of course, the material and structure of the sealing parts also differ depending on the type of product. As described above, there are various types of conventional liquid filling port sealing methods according to the type of product as shown in the section “Mode for Carrying Out the Invention”. Various improvement methods as shown in Documents 1 to 3 have been proposed.

Patent application title: Sealed battery and method for sealing liquid injection hole thereof Patent application title: Method for manufacturing control valve type lead-acid battery JP-A-2005-197148 Lead-acid battery liquid plug and lead-acid battery

  In any conventional liquid inlet sealing structure, it is a precondition that a sealing part is attached to the liquid inlet after liquid injection. For this reason, the manufacture of this type of product requires separate management of the ordering and inventory of sealing-related parts (liquid inlet member and sealing part), and the production line also requires installation and management of the sealing part mounting device. Parts supply work for this is required. In addition, the VA (value analysis) of the sealing-related parts is based on the precondition that the liquid injection member and the sealing parts are separated, and the improvement effect is also limited to this range.

The present invention has been devised in view of the problems as described above, and has been devised to solve the problems, and a liquid injection port in which a sealing plug is previously incorporated in a liquid injection member for providing a liquid injection passage at a component stage. An electrochemical device that eliminates the need to separate and manage liquid injection port members and sealing parts, which were previously considered necessary, by unitizing the sealing structure, and also eliminates the need for sealing part mounting devices and sealing part supply operations The purpose is to provide. Another objective is to further reduce the cost of sealing-related parts and improve the performance of the product by VA (value analysis) of the injection-sealing structure, which was not possible with the conventional structure on the premise of separation.

In order to solve these problems, a first invention is an electrochemical device including a liquid injection passage for injecting an electrolytic solution and a sealing plug for sealing the liquid injection passage. A first plugged state in which a sealing plug is pre-installed in a liquid inlet member for providing a passage for the electrolyte, and a passage through which an electrolyte can be injected exists between the liquid inlet member and the sealing plug; It is an electrochemical device characterized in that it is configured to be able to maintain a second mounting state in which is sealed with a sealing plug.

According to a second aspect of the present invention, a sealing plug holding rib is provided in either the liquid filling member or the sealing plug, the liquid filling member is provided with a sealing passage portion, and the sealing plug is held by the sealing plug holding rib. The first mounting state in which there is a passage through which electrolyte can be injected between the liquid inlet member and the sealing plug, and the liquid injection passage is sealed with the sealing plug by installing the sealing plug in the sealing passage portion. The electrochemical device according to the first aspect of the invention is characterized in that the second attached state is maintained.

The third invention includes a liquid injection member having a cylindrical portion, a columnar portion, and a sealing plug having a columnar body having a double D-cut shape portion provided with two D-cut or D-cut surfaces. A first mounting state in which there is a passage capable of injecting an electrolyte between the liquid injection member and the sealing plug by holding the double D-cut shape portion with the cylindrical portion, and the columnar portion into the cylindrical portion The electrochemical device according to the first aspect of the present invention is configured to maintain a second mounting state in which the liquid injection passage is sealed with a sealing plug by being mounted.

The fourth invention is an elastic material for sealing, such as an O-ring or a packing, which is attached to a sealing part of either the liquid injection member or the sealing plug in order to make the sealing plug detachable or make the sealing more reliable. A first mounting state in which there is a passage through which an electrolyte can be injected between the liquid inlet member and the sealing plug, and injection by attaching the sealing plug to the sealing portion of the liquid inlet member The electrochemical device according to the second and third inventions is characterized in that the second passage state in which the passage is sealed with the sealing plug and the sealing elastic material can be maintained.

5th invention is equipped with the elastic material for sealing with which the site | part for sealing of either a liquid inlet member or a sealing plug is equipped, and has a channel part for liquid injection, for sealing between a liquid inlet member and a sealing plug The first mounting state in which there is a passage through which the electrolyte can be injected via the elastic material injection passage portion, and the sealing plug is turned to seal the liquid injection passage portion of the sealing elastic material. Thus, the electrochemical device according to the first aspect of the present invention is configured to maintain the second mounting state in which the injection passage is sealed with the sealing plug and the sealing elastic material.

  According to the present invention, it is possible to provide the above-described electrochemical device at a lower total cost as shown below, and to improve the performance. The effects include effects common to each type of product and individual effects that differ for each type. Individual effects that differ for each type are shown below for typical types of products. In addition, an electrochemical device having a similar structure has the same effect as the following typical types of products. (For the individual effects on typical types of products, refer to the contents described in the “Mode for Carrying Out the Invention” section.)

1) Effects common to each type of product (effects of claim 1 of claims)
If the invention of claim 1 is adopted for the electrochemical device, the sealing-related parts are separated and purchased / stocked by unitizing the liquid injection sealing structure in which the sealing plug is previously incorporated in the liquid injection member. The management cost is not required, and the sealing component mounting device, the component supply work for this, and the facility management are not required on the production line. In addition, since the sealing is performed only by simple operations such as contact, press-fitting, insertion, screwing, or rotation of the sealing plug, it becomes a simple device, and the conventional laser welding machine and liquid plug mounting device are used. Such a complicated and expensive manufacturing apparatus is not necessary. As a result, the necessary capital investment is reduced and the direct and indirect processing costs are also reduced, resulting in a total cost reduction. In addition to the above, as shown in the individual effects below, new VA by unitization becomes possible, and the cost of sealing-related parts can be further reduced.
In addition, according to the present invention, it is also possible to purchase seal-related parts separately, assemble them at the parts stage and unitize them, and then supply them to the production line.

-Individual effects on sealed batteries (effects according to claim 2 or 3 of claims)
Non-aqueous electrolyte (organic solvent-based electrolyte) is injected in a nitrogen gas atmosphere. After that, the injection passage is sealed, and a non-returnable safety valve structure is provided. On the other hand, the effect of this invention in Example 1 which employ | adopted invention of Claim 2 of a claim is described below. The same applies when the invention of claim 3 of the claims is adopted.
a) Continuously with a simple device without using a glove box, nitrogen gas replacement in the battery, liquid injection under a nitrogen gas atmosphere or liquid injection in a state where the inside of the battery is kept under reduced pressure (or vacuum), and In addition, since the sealing in a raw gas atmosphere or the pressure-reducing sealing can be performed, the electrical performance is improved by easily and surely discharging the air in the gap of the power generation / storage element such as the electrode plate or separator in the battery. It is possible to inject liquid by gravity while maintaining the inside of the battery at a reduced pressure (or vacuum), and further pressurize the electrolyte by injecting the injection nozzle close to the head of the injection port member. In addition to facilitating the injection of the electrolyte of viscosity, the internal penetration and diffusion are fast and the performance stabilization is promoted. When sealed under reduced pressure, pressure is applied to the power generation / storage element such as the electrode plate and separator via the case due to atmospheric pressure, which improves mechanical strength and electrical performance, and increases the internal gas pressure. Risk is reduced.
b) Since no laser welding is required to seal the sealing plug, there is no risk of electrolyte leakage from poorly welded parts due to evaporation of the electrolyte due to welding heat, and high component accuracy required for laser welding is not required As a result, the cost of parts decreases.
c) Since the force required for press-fitting the sealing plug is small and the stress on the laser welding portion between the case sealing lid and the case is suppressed, there is little risk of electrolyte leakage due to cracks. In addition, the container inner side provided in the container inner side portion of the sealing hole has a large diameter conical hole, which increases resistance to the sealing plug from coming out of the container and increases the resistance of the sealing plug to the outer side of the container. The resistance to slipping out can be set below the burst strength of the case, so the cost can be reduced by eliminating the need for a safety valve, or the safety can be improved by providing a function as a second safety valve. Furthermore, when the pressure in the container rises, the lateral outer surface is pressed against the inner surface of the sealing hole or / and the conical hole by the internal pressure of the recess opening only on the container inner side of the sealing plug. It is possible to increase the resistance to the improvement and the removal of the sealing plug to the outside of the container.
d) If a liquid injection port is provided on the external terminal of the case sealing lid to serve also as the liquid injection member, not only the cost of parts is reduced, but also the area for the liquid injection port of the case sealing lid becomes unnecessary. Thereby, the current can be increased by increasing the diameter of the external terminal, and the strength of the case sealing lid itself and the strength of the welded portion of the case are improved by simplifying the shape of the sealing lid.

・ Individual effects on control valve type lead acid batteries. (Effects of Claim 2 or 3 of Claim)
The negative electrode absorption control valve type lead-acid battery exposes the negative electrode plate and suppresses the generation of hydrogen gas on the negative electrode plate by absorbing the oxygen gas generated from the positive electrode plate during charging into the negative electrode plate, It is a sealed lead-acid battery in which the electrolysis of moisture in the electrolyte and the resulting moisture reduction are suppressed. This lead storage battery is provided with a control valve for releasing the internal gas when the internal gas pressure rises. On the other hand, the effect of the present invention in the second embodiment adopting the invention of claim 2 of the claims will be described below. The same applies when the invention of claim 3 of the claims is adopted.
a) Not only does the cost of the control valve, which is expensive and costly, become a simple and inexpensive sealing plug, but it does not require a significant reduction in cost. The cost is reduced.
b) Nitrogen gas replacement in the battery without using a glove box, injection under a nitrogen gas atmosphere or vacuum injection, and sealing or vacuum sealing can be performed continuously with a simple device. Electrical performance is improved because the air in the gap is easily and reliably discharged.

• Individual effects on liquid lead-acid batteries. (Effects of Claims 3, 4, and 5 of Claims)
Liquid lead-acid batteries, such as automobile batteries, are the most common lead-acid batteries that have a sufficient electrolyte in the battery case and have a gas outlet that is always open. On the other hand, the effect of the present invention in the third embodiment adopting the inventions of claims 3 and 4 is that the liquid stopper and the liquid-tight packing are already attached to the battery case lid at the parts stage. Sealing is completed simply by screwing the liquid stopper, and there is no trouble such as a screwing failure when the liquid stopper is mounted in a conventional automatic liquid stopper mounting apparatus, and the operating rate of the entire production line can be improved. Moreover, in Example 4 which employ | adopted invention of Claim 5 of a claim, not only the operating rate improvement of the whole manufacturing line by the completion of sealing only by rotation of a liquid stopper but also the cost-effective battery case lid Since the female screw and the male screw of the liquid stopper are not required, the molding die cost and the part cost can be reduced, and a flat battery that can be easily assembled in an automobile in which the liquid stopper head does not protrude from the upper surface of the battery can be provided.

FIG. 6 is an explanatory view (cross-sectional view) showing a first mounting state of the liquid filling port member 2 serving also as an external terminal of the sealed battery and the sealing plug 3 when the sealing plug holding rib 2f is provided on the liquid filling member 2; The electrolytic solution is injected through the path indicated by the arrow. FIG. 1-3 shows an example when the sealing plug is a metal sheet press product. FIG. 5 is an explanatory view (cross-sectional view) showing a first mounting state of a liquid injection port member 2 also serving as an external terminal and a sealing plug 3 that is caulked and mounted on an aluminum sealing lid 1 of a sealed battery, and nitrogen gas replacement and liquid injection method Is also explained. The imaginary line seal plug indicates the second wearing state. FIG. 6 is an explanatory view (cross-sectional view) showing a first mounting state of the liquid filling member 2 serving also as an external terminal of the sealed battery and the sealing plug 3 when the sealing plug holding rib 3f is provided on the sealing plug 3; FIGS. 3-3 and 3-4 are explanatory views showing the sealing plug when the double D cut is performed. The electrolytic solution is injected through the path indicated by the arrow. The explanatory view (cross-sectional view) showing the first mounting state of the control valve type lead-acid battery when the sealing plug holding rib 8f is provided in the battery case lid 8 will also explain the nitrogen gas replacement and the liquid injection method. In the explanatory view (cross-sectional view) showing the second mounting state of the control valve type lead-acid battery when the sealing plug holding rib 8f is provided in the battery case lid 8, the gas discharge path will also be described. In the explanatory view (cross-sectional view) showing the first mounting state of the control valve type lead-acid battery when the sealing plug retaining rib 3f is provided in the sealing plug 3, the nitrogen gas replacement and the liquid injection path will also be described. The gas replacement nozzle 6 and the injection nozzle 7 are not shown. An explanatory view (cross-sectional view) showing the first and second mounting states of the liquid lead live battery of the liquid stopper screw-in type will also explain the liquid injection path. The internal structure of the liquid stopper is a conventional structure, but is illustrated as a solid body for simplicity. Further, the gas discharge path is not shown. The liquid injection path will also be described with reference to explanatory views (cross-sectional views) showing the first and second mounting states of the liquid lead live battery of the liquid stopper rotation type. The second mounting state in which the liquid stopper is rotated 180 degrees is shown by an imaginary line in FIG. 8-1 and FIG. 8-4 (cross-sectional view). The holding plate 15 common to the liquid stopper is indicated by an imaginary line in FIG. The internal structure of the liquid stopper is a conventional structure, but is illustrated as a solid body for simplicity. Further, the gas discharge path is not shown.

Since the specific liquid inlet sealing structure varies depending on the type of product, the liquid inlet sealing structure of the present invention will be described below for typical types of products. However, the following description items show typical examples, and are also applied to electrochemical devices such as batteries and capacitors having similar structures, and are not limited to the description examples. In addition, the same reference numerals are used for the components having the same function.

1) Sealing Battery Pouring Port Sealing Structure When the invention of claim 2 is adopted, an application example for a sealing battery in which a sealing plug holding rib 2f is provided in the pouring member 2 is as follows. Describe. Although there is a similar structure such as a capacitor, a typical product is described based on a lithium ion battery whose usage is rapidly expanding.
The configuration and operation of each component are as follows. (See Figures 1 and 2)

a) Except for the injection hole sealing structure, the conventional lithium ion battery is configured and is not described here.
b) The liquid injection passage 21 is provided in either the liquid injection member or the external terminal caulked to the aluminum sealing lid 1 for sealing the aluminum case, but the external terminal is also used as the liquid injection member. Of course, this is advantageous in terms of cost. The aluminum sealing lid 1 may be subjected to a necessary molding process to be used as a liquid injection port member. The liquid injection port member 2 also serving as an external terminal includes a head 2a serving as an external terminal, a passage 2g between a sealing plug holding rib 2f for holding the sealing plug 3 in the central shaft hole 2e and a sealing plug holding rib 2f. Sealing stopper holding part 2b, sealing passage holding part 2c having a sealing hole 2h continuously provided on the same axis on the inner side of the container of sealing stopper holding part 2b and sealed by press-fitting of sealing stopper 3 after injection , And a thin portion 2j for caulking. A recess 2d for preventing overflow at the time of liquid injection is provided at the inlet of the liquid inlet of the sealing plug holder 2b. A portion of the sealing passage 2c on the container inner side of the sealing hole 2h is a conical hole 2i having a large diameter on the container inner side.
If the sealing plug 3 is provided with a large-diameter head, the sealing passage 2c can be provided in the overflow preventing recess 2d.
c) The sealing plug 3 is made of an elastic body such as synthetic rubber, thermoplastic elastomer, synthetic resin, or a soft metal such as aluminum or a metal sheet press product, and has a column shape having a recess 3a opened only on the inner side of the container. The body is purchased in a state where it is held in the liquid inlet member 2 by the sealing plug holding rib 2f. The surface may be subjected to a coating treatment for anticorrosion or lubrication. The material can be a steel ball harder than the liquid injection member 2, but the force required for press-fitting is increased, and the stress on the laser welded part of the aluminum case is increased. In this case, the conical hole 2i is not provided.
d) The liquid injection member 2 holding the sealing plug 3 is caulked and attached to the aluminum sealing lid 1 together with the insulating materials 4a and 4b and the inner terminal 5. Further, the sealing lid 1 to which the power generation elements and the like are connected is laser welded to the aluminum case. Next, the sealing plug 3 is press-fitted from the sealing plug holding portion 2b into the sealing passage portion 2c through the electrolytic solution pouring described below. When the internal pressure of the battery rises, the sealing plug 3 is retained even by friction force and deformation resistance, but is also retained by pressing the sealing hole 2h or / and the conical hole 2i by the pressure acting on the inner surface of the recess 3a. .
e) Injection may be carried out in a glove box in a nitrogen gas atmosphere. As shown in FIG. 2, the gas replacement nozzle 6 fitted with a synthetic rubber elastic tip 6a is pressed and sealed to the aluminum sealing lid 1. Through this, the inside of the battery is decompressed again after nitrogen gas replacement. Next, liquid is injected from the liquid injection nozzle 7, and then nitrogen gas is sealed up to atmospheric pressure. When the electrolytic solution is pressurized and injected, an elastic tip made of synthetic rubber is attached to the injection nozzle 7 and this is pressed and sealed to the head 2a of the injection port member. The sealing is performed by reducing the pressure again to a predetermined pressure in the next stage and then press-fitting the sealing plug 3 into the sealing passage 2c. The vacuum sealing may be continuously performed after the injection. When it is necessary to avoid the atmospheric pressure being applied to the battery case when the battery case is evacuated during nitrogen gas replacement, the gas replacement nozzle 6 is not loaded with the aluminum sealing lid 1 and the battery is loaded in the production facility. What is necessary is just to press-seal on the surface and to evacuate the inside and outside of the battery case at the same time.
f) When making the sealing plug 3 detachable or making the sealing more reliable, the invention of claim 4 of the claims is adopted, and the sealing elastic member such as an O-ring or packing is used as the liquid injection member 2 or Attach to the sealing part of sealing plug 3. If necessary, a detachable grip is provided on the sealing plug 3. When the sealing plug is completely fixed, an adhesive or the like may be injected onto the sealing plug 3 after press-fitting.
g) When the sealing plug holding rib 3f is provided on the sealing plug 3 side, the structure shown in FIG. Further, as shown in FIGS. 3-3 and 3-4, the sealing plug holding rib 3f is not provided, and a double D-cut shape adopting the invention of claim 3 can be adopted.
If the sealing plug 3 is provided with a head having a diameter larger than that of the sealing plug holding rib 3f, the sealing passage portion 2c can also be provided in the overflow preventing recess 2d.

2) Control valve type lead-acid battery injection-sealing structure The negative electrode absorption-type control valve-type lead acid battery in which the lid 8 for holding the sealing plug is provided in the battery case lid 8 when the invention of claim 2 is adopted. An application example for is described below. This type of battery needs to be formed in a hermetically sealed battery case, and is formed in a state where a control valve is attached to the liquid injection port. If the valve opening pressure of the control valve is increased during the initial charging, the electrolyte overflows from the liquid injection port due to the high pressure of the gas generated during charging, causing various troubles. For this reason, it is necessary to increase the valve opening pressure in order to increase the sealing degree after completion of the initial charge by setting the valve opening pressure low in the initial charge to facilitate gas release. Therefore, the battery case is formed in a sealed state with a relatively low valve opening pressure after the injection, and a high valve opening pressure is set after the battery case formation.
The configuration and operation of each component are as follows. (See Figs. 4 and 5)

a) Except for the liquid inlet sealing structure, the configuration is a conventional control valve type lead-acid battery, which is not described here. That is, the synthetic resin battery case, battery case lid, power generation element, electrolyte, and external terminal are conventional. However, the liquid inlet structure and sealing plug of the battery case lid are different from the conventional one.
b) The liquid inlet member is integrally formed with the battery case lid 8 made of synthetic resin. The liquid injection port structure has a liquid injection port cover mounting part 8k, a sealing plug holding part having a sealing plug holding rib 8f for holding the sealing plug 3 in the central shaft hole 8e and a passage 8g between the sealing plug holding rib 8f. 8b and a sealing passage portion 8c having a sealing hole 8h continuously provided on the same axis on the container inner side of the sealing plug holding portion 8b and sealed by insertion of the sealing plug 3 after injection Is done. A recess 8d is provided at the inlet of the sealing stopper holding part 8b to prevent overflow during injection, and a conical shape in which the conical surface 3m of the lower end of the sealing stopper 3 is pressed at the inlet of the sealing hole 8h. A sealing surface of 8m is provided. The conical sealing surface 8m may be a ring-shaped protrusion.
c) The sealing plug 3 is made of an elastic body such as synthetic rubber, thermoplastic elastomer, or synthetic resin, and is a columnar body having a concave portion 3a and a conical end surface 3m on the inner side of the container. Purchased and stored while being held by the holding unit 8b. The surface may be subjected to a coating treatment for anticorrosion or lubrication. The conical end surface 3m may be a ring-shaped protrusion. The battery case lid 8 holding the sealing plug 3 is welded or adhered to the battery case containing the electric storage element, and is connected to the terminal so that the electrolyte solution can be injected.
d) The liquid injection may be performed in an open state, but the gas replacement nozzle 6 fitted with the synthetic rubber tip 6a is pressed and sealed against the battery case lid 8 as in a sealed battery, and the inside of the battery is nitrogenated. The gas is replaced, and then the liquid is injected under reduced pressure. Thereafter, nitrogen gas is sealed up to atmospheric pressure. The sealing is performed by bringing the sealing plug 3 into contact with the sealing plug contact portion 8c in the next stage. In order to stabilize the sealing performance, the contact may be made after the pressure reduction again, or the sealing may be continuously performed in the reduced pressure state after the injection. The sealing plug 3 is held by the sealing plug holding rib 8f. However, when the sealing plug 3 is sealed under reduced pressure, the sealing plug 3 is also held by the internal and external pressure difference of the battery.
e) Initial charging is performed using a charging method with less gas generation as shown in JP-A-2002-63895. After completion of initial charging, the inlet cover 9 is press-fitted or adhered to the inlet cover mounting portion 8k. Installing. The liquid inlet cover 9 is provided with a plurality of gas discharge longitudinal grooves 9a on the outer peripheral portion, and an explosion-proof filter 10 is mounted on the inner side of the container. This type of battery is sealed with a conical surface 3m at the lower end of the sealing plug 3 and a conical sealing surface 8m of the liquid injection member, and hydrogen gas does not normally stay in the sealing plug holding portion 8b. Therefore, it is possible not to provide the explosion-proof filter 10 depending on the application. The valve opening pressure of the control valve is set by the compression force of the sealing plug 3 set by the liquid inlet cover 9 and the sealing surface 8m. A pressure adjusting spring can be attached between the liquid inlet cover 9 and the sealing plug 3. Further, the liquid inlet cover 9 and the sealing plug 3 can be integrally formed. In this case, liquid is injected from the side of the sealing plug 3, and the valve opening pressure is set by the elasticity of the sealing plug 3. Further, the sealing passage 8c may be provided in the overflow preventing recess 8d.
When the gas generated by the initial charge is discharged and the internal pressure of the battery is stabilized, the replacement nozzle 6 is pressed and sealed after the initial charge and the sealing plug holding portion 8b is depressurized, so that the conical end surface 3m and the sealing surface 8m are formed. Since a void is formed, the sealing plug 3 is brought into contact again after nitrogen gas replacement through this gap.
f) When the sealing plug holding rib 3f is provided on the sealing plug 3, the configuration shown in FIG. In this case, the mold for molding the sealing plug holding portion 8b of the battery case lid 8 is simplified, and the mold cost is reduced. Further, the sealing plug holding rib 3f is not provided, and a D-cut or double D-cut shape adopting the invention of claim 3 can be adopted.

3) Liquid stopper screw-in type liquid lead-acid battery injection port sealing structure The liquid stopper screw-in type liquid type generally employed at present when the inventions of claims 3 and 4 of the claims are adopted Application examples for lead-acid batteries are described below. In the conventional liquid stopper screwing method, a battery case is formed after pouring, and a liquid stopper is screwed into the battery case cover after the battery case is formed. Battery case formation is performed with the electrolyte open to the atmosphere. The liquid stopper has a gas discharge port, and an anti-explosion filter and a splash-proof body that prevents the electrolyte from reaching the explosion-proof filter due to vibration of the battery, etc. Is installed.
The configuration and operation of each component when the inventions of claims 3 and 4 are adopted are as follows. (See Figure 7)

a) Other than the liquid stopper, the configuration of the conventional liquid lead-acid battery is used and is not described here. That is, the battery case made of synthetic resin, the battery case lid 13, the power generation element, the electrolytic solution, and the external terminal are conventional.
b) The liquid stopper 11 is a conventional structure except that the columnar body portion is entirely threaded and the tip side is double D-cut, and includes a disk-shaped head portion 11a and a columnar body 11b protruding from the head portion 11a. Composed. After the liquid-tight packing 12 is attached, it is purchased and stored in a state where it is partly screwed into the cylindrical part 13a of the battery case lid 13 that has been subjected to female threading. The head 11a is formed with a coin groove for tightening or loosening the liquid stopper 11 on the upper surface and an exhaust port for discharging internal gas, and an explosion-proof filter is mounted inside the exhaust port. The columnar body 11b includes a columnar portion 11c having a male screw on the circumferential portion on the head 11a side and a double D-cut portion 11d having a screw portion only on the circumferential portion. The D-cut surface of the double D-cut portion 11d is closed. Inside the columnar body 11b, a splash-proof body that prevents the splash of the electrolyte from reaching the explosion-proof filter and discharges the internally generated gas to the outside via the explosion-proof filter is an inclined version for refluxing the electrolyte. Is mounted so as to be orthogonal to the double D-cut surface. The entire columnar body 11b may be the double D cut portion 11d without providing the columnar section 11c.
In the explanatory view, only the features of the present invention are described, and what is normally provided in a liquid stopper such as a coin groove, an exhaust port, an explosion-proof filter, a splash-proof body, and an inclined plate is not shown.
c) The battery case lid 13 holding the liquid stopper 11 is thermally welded to the battery case, and after connecting the terminal, the electrolyte solution is injected from the passage 11g between the tubular portion 13a of the battery case lid 13 and the double D cut portion 11d. After the battery case formation, the liquid stopper 11 is completely screwed into the cylindrical portion 13a of the battery case lid 13, and the screwed portion is liquid-tight with the liquid-tight packing 12.
d) As described above, during use of the battery, the electrolytic solution is refluxed into the battery in the same manner as in the prior art, and the internally generated gas is released to the outside.

3) Liquid plug rotation structure of liquid lead storage battery of the liquid plug rotation type When the invention of claim 5 is adopted, an elastic material for sealing is attached to the battery case lid and the liquid plug is rotated. Application examples for liquid lead-acid batteries to be sealed are described below. Also in this embodiment, the liquid stopper has a gas discharge port and is equipped with an explosion-proof filter and a splash-proof body that suppresses the electrolyte from reaching the explosion-proof filter due to vibration of the battery, etc. The liquid inlet structure of the battery case lid is partially different.
The configuration and operation of each component are as follows. (See Figure 8)

a) Other than the liquid inlet structure of the liquid stopper and the battery case lid, it is configured as a conventional liquid type lead-acid battery and is not described here. That is, the battery case, the power generation element, the electrolytic solution, and the external terminal made of synthetic resin are conventional.
b) The cylindrical projection 13b of the battery case lid 13 has no female screw, and is provided with a cylindrical sealing elastic member mounting portion 13c at the top. The sealing elastic material mounting portion 13c is provided with a longitudinal groove 13p for preventing the sealing elastic material 14 from rotating by the rotation of the liquid stopper 11, and for injecting the sealing elastic material 14 into a part of the lower part. An injecting vertical groove 13h is provided at a position corresponding to the passage 14h.
c) The sealing elastic material 14 is a cylindrical elastic material that is mounted on the sealing elastic material mounting portion 13c of the battery case lid 13 and has a liquid injection passage 14h in a part of the lower portion. Protrusions 14p are provided in the axial direction at positions corresponding to the grooves 13p.
d) The liquid stopper 11 does not have an external thread, and the basic structure is a conventional structure except that the vertical groove 11h for liquid injection is provided on the upper part. The disk-shaped head 11a and the columnar body 11b protruding from the head 11a Composed. The liquid stopper 11 is purchased and stored in a state where the liquid stopper 11 is completely press-fitted into the sealing elastic member 14 at a relative position so as to secure a liquid injection passage. The head 11a is formed with a turning coin groove 11q for turning the liquid stopper 11 on the upper surface and an exhaust port for discharging internal gas, and an explosion-proof filter is mounted inside the exhaust port. A liquid injection vertical groove 11h is provided at the top of the head 11a and the columnar body 11b. The columnar body 11b is equipped with a splash-proof body and an inclined plate for refluxing the electrolyte to prevent the splash of the electrolyte from reaching the explosion-proof filter and discharge the generated gas to the outside via the explosion-proof filter. Is done.
e) The battery case lid 13 holding the liquid stopper 11 is thermally welded to the battery case. After connecting the terminals, the vertical groove 11h for injecting the liquid stopper 11, the passage part 14h for the injection elastic member 14 and the battery case cover The electrolyte solution is injected through the 13 injection vertical grooves 13h, and after the battery tank is formed, the liquid stopper 11 is rotated 180 degrees to perform sealing.
f) When the sealing elastic member 14 is attached to the liquid stopper 11, a vertical groove for preventing rotation is provided in the liquid stopper 11. Further, without using the sealing elastic material 14, the outer peripheral portion of the columnar body 11b of the liquid stopper may be coated with an elastic material such as synthetic resin.
g) The liquid stopper 11 may fall off from the battery case lid 13 in extremely rare situations where the internal pressure rises due to clogging of the explosion-proof filter or the automobile falls or reverses. In order to cope with the characteristics, a presser plate 15 that is common to the liquid stopper is provided on the upper surface of the battery case lid 13 for the portion that does not hinder the liquid injection and rotation of the liquid stopper head 11a. The holding plate 15 is adhered to the battery case lid 13 with a double-sided tape, or the holding plate 15 is formed in a U shape and the bent portions at both ends are pressed and held on the side surfaces of the battery case lid 13. In any case, since the battery holding plate 15 is pressed against the battery case lid 13 by the battery fixing metal fitting when the battery is assembled to the automobile, the holding plate 15 does not fall off during use.
h) As described above, while the battery is in use, the electrolytic solution is refluxed into the battery in the same manner as in the prior art, and the internally generated gas is released to the outside.

1 Aluminum sealing lid 2 (External terminal also used) Injection port member
21 Injection channel
2a Head of liquid inlet member
2b Seal stopper holding part of liquid inlet member (2d to 2g)
2c Sealing passage for liquid injection member (2h ~ 2i)
2d Overflow-preventing recess in the seal stopper holding part of the liquid inlet member
2e Center shaft hole of the seal stopper holding part of the injection port member
2f Seal plug holding rib of the seal plug holding part of the liquid inlet member
2g Passage of the seal stopper holding part of the injection port member
2h Sealing hole in the sealing part of the liquid inlet member
2i Conical hole in the sealing part of the inlet member
2j Thin-walled part of the injection port member 3 Seal plug
3a Concave part opened only on the inner side of the container of the sealing plug
3 Seal plug retaining rib
3g Seal plug passage
3m conical contact surface of sealing plug
4a, 4b insulation
5 Inner terminal
6 Gas replacement nozzle
6a Synthetic rubber tip of the gas replacement nozzle 7 Injection nozzle
8 Battery case lid
8b Cap holder for battery case lid (8d-8g)
8c Sealing plug contact part of battery case cover (8h ~ 8m)
8d Overflow prevention recess of battery case lid stopper
8e Center shaft hole in the closure stopper holding part of the battery case lid
8f Seal plug retention rib of battery case cover plug retainer
8g Aisle of battery case lid
8h Sealing hole in the sealing part of the battery case lid
8k Inlet cover part of battery case cover
8m Conical surface of the sealing part of the battery case lid 9 Cover for liquid injection port
9a Gas discharge vertical groove of the inlet cover
10 Explosion-proof filter
11 Liquid stopper
11a Fluid faucet head
11b Columns of liquid stoppers (11c, 11d)
11c Columnar part of the columnar body of the liquid stopper
11d Double D-cut part of columnar body of liquid stopper
11e Lower notch of column of liquid stopper
11g Pathway between the cylindrical part of the battery case lid and the double D-cut part
11h Vertical groove for liquid injection
11p Vertical groove for preventing rotation of liquid stopper
11q Coin groove for turning the liquid stopper
12 Liquid tight packing
13 Battery case cover
13a Tubular part of battery case lid
13b Tubular protrusion of battery case lid
13c Elastic case for sealing battery case lid
13p Vertical groove for preventing rotation of battery case lid
・ Cylindrical sealing elastic material
14h Cylindrical elastic material for sealing
14p Axial projection of cylindrical sealing elastic material
15 Common stopper plate

Claims (5)

In an electrochemical device comprising an injection passage for injecting an electrolyte and a sealing plug for sealing the injection passage, an injection port member for providing the injection passage, and the sealing plug The first mounting state in which there is a passage through which electrolyte can be injected and the second mounting state in which the liquid injection passage is sealed with the sealing plug can be maintained. Electrochemical device. The liquid injection member is provided with a sealing plug holding rib in either the liquid injection member or the sealing plug, the liquid injection member is provided with a sealing passage portion, and the sealing plug is held by the sealing plug holding rib. A first mounting state in which a passage capable of injecting an electrolyte exists between the mouth member and the sealing plug; and the liquid injection passage is connected to the sealing plug by mounting the sealing plug on the sealing passage portion. 2. The electrochemical device according to claim 1, wherein the second mounting state sealed with the nozzle can be maintained. A liquid injection member having a cylindrical portion, a columnar portion, and a sealing plug having a columnar body having a D-cut or double D-cut shape portion, and holding the D-cut or double D-cut shape portion by the cylindrical portion A first mounting state in which a passage capable of injecting an electrolytic solution exists between the liquid injection member and the sealing plug, and liquid injection by mounting the columnar part on the cylindrical part. 2. The electrochemical device according to claim 1, wherein the second mounting state in which the passage is sealed with the sealing plug can be maintained. A sealing elastic member to be attached to any one of the sealing member and the sealing plug is provided, and there is a passage where an electrolyte can be injected between the liquid filling member and the sealing plug. One mounting state and a second mounting state in which the liquid injection passage is sealed with the sealing plug and the sealing elastic material by mounting the sealing plug on the sealing portion of the liquid injection member are maintained. The electrochemical device according to claim 1, 2 or 3, wherein the electrochemical device is configured to be possible. A sealing elastic material having a liquid injection passage portion mounted on a sealing part of either the liquid injection member or the sealing plug is provided, and the sealing elastic material is provided between the liquid injection member and the sealing plug. A first mounting state in which there is a passage through which the electrolyte can be injected via the liquid injection passage portion, and the liquid injection passage portion of the sealing elastic member is sealed by rotating the sealing plug The electrochemical device according to claim 1, wherein the second injection state in which the liquid injection passage is sealed with the sealing plug and the sealing elastic material can be maintained.

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