JP3464612B2 - Manufacturing method of lithium secondary battery - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to injection of an electrolyte solution .
And discharge of unnecessary electrolyte, and by enabling to carry out sealing of the battery easily, simplify the production process
The present invention also relates to a method for manufacturing a lithium secondary battery, which contributes to reduction of production cost and improvement of energy density.

[0002]

2. Description of the Related Art In recent years, portable electronic devices such as mobile phones, VTRs, and notebook computers have been rapidly reduced in size and weight. As batteries for power supplies thereof, lithium transition metal composite oxide is used as a positive electrode active material. Secondary batteries using a carbonaceous material as a negative electrode active material and an organic electrolytic solution in which a Li ion electrolyte is dissolved in an organic solvent as an electrolytic solution have been used.

Such a battery is generally called a lithium secondary battery or a lithium ion battery,
Due to its high energy density and high unit cell voltage of about 4V, not only the above-mentioned portable electronic devices, but also the widespread use as a low-pollution vehicle in the public due to recent environmental problems. Electric vehicle (EV)
Alternatively, it has been attracting attention as a motor drive power source for a hybrid electric vehicle (HEV).

Lithium secondary batteries have various forms as an internal electrode body that is a portion that performs a battery reaction. In coin type batteries, a sandwich type internal electrode body in which a separator is sandwiched between a positive electrode plate and a negative electrode plate is used. To be Here, as the positive electrode plate and the negative electrode plate, those obtained by molding a positive electrode material and a negative electrode material into a plate shape (coin shape) by press molding or the like are preferably used.

Further, in a cylindrical lithium secondary battery, a tab for current collection (current collection ) as shown in FIG. 8 is generally used.
Means) 5 is wound internal electrode body 1 is wound on the outer periphery of the circular cylindrical core 6 via the separator 4 so as not to contact with each other and the positive electrode plate 2 and the negative electrode plate 3 mounted is used.
Incidentally, a plurality of sheets prepared by cutting the positive electrode plate 2 and the negative electrode plate 3 described above in a small area, have been proposed these internal electrodes of multilayer laminated alternately with a separator 4.

Now, no matter which structure is adopted as the internal electrode body, it is necessary to impregnate these internal electrode bodies with the electrolytic solution. Here, as the electrolytic solution, a nonaqueous electrolytic solution in which a lithium electrolyte is dissolved in an organic solvent (hereinafter, simply referred to as “electrolytic solution” ) is used. For example, in a coin-type battery, an internal electrode body is provided in a battery case. After mounting, a method is used in which a fixed amount of electrolytic solution is injected in a vacuum atmosphere using a metering pump or the like, and the battery case is sealed to fill the electrolytic solution. Even when the wound type internal electrode body is used, a similar method is used in a small capacity battery, for example, a general 18650 (diameter 18 mmφ, length 65 mm) cylindrical battery.

However, the electrolyte solution is generally expensive, the proportion of the electrolyte in the cell material cost despite not name a low, such a electrolyte filling (injection) methods in these small-capacity battery The reason for this is that in a small capacity battery, since the internal electrode body is not occupied inside the battery, the absolute value of the space filled with extra electrolytic solution (hereinafter referred to as “excess electrolytic solution”) is small,
The cost of the electrolyte filled in such a small space is not high, and in a small-capacity battery, the area of the battery reaction part is also small, and predetermined battery characteristics can be obtained by filling the required minimum amount of electrolyte. In addition, introducing a process of collecting the excess electrolytic solution rather leads to an increase in production cost.

[0008]

In a large-capacity battery used for an EV or the like, a wound type or a laminated type is used as an internal electrode body, but the battery itself naturally increases in size as the capacity increases. . In this case, when the wound type internal electrode body 1 shown in FIG. 8 is used, the space for accommodating the current collecting tabs 5 becomes wide at both ends or one end of the battery, and the core 6 is generally used. since is a circular cylindrical, the absolute volume of these spaces is increased. Therefore, in such a large-capacity battery, if the electrolytic solution is filled (injected) by the same method as that of the small-capacity battery described above, not only the expensive electrolytic solution is wastefully used but the product cost is increased. However, although it is minute, it reduces the energy density of the battery.
Furthermore, the state where the metal member other than the internal electrode body, the sealing material of the battery case, and the like are always in contact with the electrolytic solution is not preferable in terms of durability such as leakage of the electrolytic solution and corrosion of each member. .

Further, it is necessary to sufficiently impregnate the inside of a large internal electrode body having a wide battery reaction area with an electrolytic solution, and if this is insufficient, desired battery performance cannot be obtained. However, the individual battery characteristics will vary greatly. Therefore, in a large capacity battery,
It is preferable to remove the excess electrolytic solution after immersing the internal electrode body in an excess electrolytic solution in a vacuum atmosphere to sufficiently impregnate it.

Therefore, in the case of filling (injecting) the electrolytic solution in a large capacity battery using the same method as in the small capacity battery, one end 71 is first sealed as shown in FIG. 7, for example. Battery (battery case) 70 with its sealed end 71 facing downwards, such as a glove box (not shown)
After being placed in a chamber and creating a vacuum atmosphere, the electrolytic solution sent by a metering pump or the like is injected from another end 72, which is opened at the upper part, using a nozzle 73 or the like, and the liquid surface position does not lower. up while injecting the electrolytic solution, performing impregnation of the electrolyte as a predetermined time. Next, after purging the inside of the glove box or the like with an inert gas, the battery (battery case) 70 is turned upside down to discharge the excess electrolytic solution, and finally the end portion 7 released
A method of sealing 2 may be considered.

However, in such a method of injecting the electrolytic solution from the upper part of the battery, in a vacuum atmosphere, impregnation of the electrolytic solution mainly from the upper part of the internal electrode body starts, so that bubbles generated in the lower part of the internal electrode body are generated. It becomes difficult to pull out from the upper part of the battery, and the holding time in a vacuum atmosphere becomes long. In this case, when an organic solvent having high volatility is used alone in the electrolytic solution, there arises a problem that the concentration of the electrolyte changes due to evaporation of the solvent. Further, when the volatile organic solvent is used as a mixture with other non-volatile solvent or the like, the volatile organic solvent is preferentially evaporated to cause a shift in the mixing ratio, and at the same time, the electrolyte concentration also changes. Cause problems. Then, in any of these cases, the characteristics of the electrolytic solution will not be exhibited.

Further, in the case of a large-capacity battery, since the shape of the battery itself is large, it is necessary to seal the open end of the battery in the glove box or the like by placing it in the glove box or the like of the sealing device. This is not practical because it causes various problems such as an increase in the size of the glove box, a decrease in the degree of vacuum due to the increase in the size of the glove box, an increase in the size of the vacuum pump, and a large consumption of purge gas.

[0013]

Means for Solving the Problems The present invention has been made in view of the above problems of the prior art, and its main purpose is to fill the electrolytic solution particularly in a method for manufacturing a large capacity battery.
(Injection) method is simplified, electrolyte injection and unnecessary
Easily drain the electrolyte and seal the battery.
By making possible, simplification of production process and production
Product that contributes to reduction of strike and improvement of energy density
It is to provide a manufacturing method . That is, according to the present invention, a battery case containing an internal electrode body formed by winding a positive electrode plate and a negative electrode plate around a cylindrical winding core with a separator interposed therebetween.
Inside, inject the electrolyte using the electrolyte injection nozzle,
The internal electrode in which the electrolytic solution is impregnated in the battery case
A method of manufacturing a lithium secondary battery, wherein a lithium secondary battery having a body housed therein is obtained , comprising:
While accommodating the pole body,
For inserting and removing the electrolyte injection nozzle in areas other than the barrel area
At least one internal terminal and the internal
A plurality of places of current collecting means connected to the terminals are provided, and an electrolyte injection port penetrates at least at one end side of the battery case at a portion corresponding to an outer extension of the cylindrical hole of the winding core. Formed lid
And sealing both ends of the battery case,
Even if the tip of the liquid injection nozzle is shallow from the electrolyte injection port
End face of the internal electrode body on the other end side of the battery case
Insert up to the position, the electrolyte, the cylindrical hole of the winding core
From the lower portion of the internal electrode body via, injected at least until the <br/> internal electrode body is immersed, then the battery
Excessive electrolyte remaining in the case is discharged to the outside using an electrolyte discharge nozzle, and the inside is impregnated with the electrolyte.
Rechargeable battery with an electrode body and a battery capacity of 2 Ah or more.
Provided is a method for manufacturing a lithium secondary battery, which comprises obtaining a lithium secondary battery.

The present invention as described aboveIn the manufacturing method
IsThe core and theElectrolyte inletThe abovebatteryCase
Placed in the center ofIt is preferable to. Also,The aboveElectrolyte injection
With the input nozzleThe aboveNozzle for discharging electrolyteWhenOne nozzle
Combined withDoCan be filled with electrolyte(Injection)workSimplifies
RuFrom the point, it is preferable. Also,The aboveNozzle for electrolyte injection
OrThe abovePlace the tip of the electrolyte discharge nozzleThe abovebatteryCaseof
Insert up to the other end (bottom)The aboveInjection of electrolyte or
Draining can discharge more electrolyte.
Is preferable. At this time,The abovebatteryOf the caseInside the other end
A dent in the centerToSettingKe, the aboveDepressionSurplus remaining in
Discharge the electrolyte solution using the electrolyte solution discharge nozzle.
AndExcessive electrolyte tends to remain in this recess,
Can be easily discharged using the electrolyte discharge nozzle.
Will be able toPreferable from the point of view. AndThe aboveSurplus electrolysis
After draining the liquid,The aboveExternally fix the electrolyte inlet with screws
Me, PressureEnteringOrCan be blocked by filling with sealing material,
BatteryManufacturingOf process simplificationpointIs preferred.

Furthermore, have use the pipe as the body member of the battery case, so that the lid closes both ends of the pipe, said cell case by caulking the end portion of the pipe
After sealing the over scan, this performing injection / discharge of the electrolyte
DOO is either a point that can be to simplify the manufacturing process of the battery
Are preferred. The manufacturing method of the present invention, that apply to the case of manufacturing a battery having a battery capacity of more than 2Ah.

[0016]

[0017]

[0018]

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, will be explained with reference to the drawings, embodiments of the present invention, the invention is not such limited to these embodiments. In the method for manufacturing a lithium secondary battery in the present invention, as described above with reference to FIG. 8, the positive electrode plate 2 and the negative electrode plate 3 are wound around the outer periphery of the winding core 6 via the separator 4. The inner electrode body 1 to be formed is impregnated with the electrolytic solution. Here, specifically, the positive electrode plate 2
Is a metal foil such as aluminum or titanium, and the negative electrode plate 3 is a metal foil such as copper or nickel as an electrode substrate (current collector), and the electrode active material is applied to both surfaces of each electrode substrate to form an electrode active material layer. It is made. Also, a tab (collecting means) 5
At the time of winding the positive electrode plate 2 and the negative electrode plate 3 together with the separator 4 by means of ultrasonic welding or the like .
Attached to a plurality of locations, to configure a plurality of positions collector means
It At this time, it is preferable that the tabs 5 constituting the current collecting means at a plurality of locations are arranged at substantially equal intervals so that the positive electrode plate 2 and the negative electrode plate 3 can collect current from a fixed area. The material is often the same as the electrode substrate to which the tab 5 is attached. The core 6 is needed use the tubular member having a tubular hole (hollow portion) 7.

The positive electrode active material used for producing the positive electrode plate 2 is not particularly limited, and lithium cobalt oxide (LiCoO ₂ ) or lithium nickel oxide (LiNi) is used.
O ₂ ), lithium transition metal composite oxides such as lithium manganate (LiMn ₂ O ₄ ) are preferably used, and carbon fine powder such as acetylene black is preferably added as a conduction aid. On the other hand, as the negative electrode active material, an amorphous carbonaceous material such as soft carbon or hard carbon, or highly graphitized carbonaceous powder such as artificial graphite or natural graphite is used. The electrode active material of each of these electrodes is slurried,
Apply to both sides of each electrode substrate and fix it to the electrode plate 2
・ 3 is created.

Further, the separator 4 has a three-layer structure in which a lithium ion permeable polyethylene film (PE film) having micropores is sandwiched between porous lithium ion permeable polypropylene films (PP film). Is preferably used. This is because when the temperature of the internal electrode body 1 rises, the PE film is about 1
It also functions as a safety mechanism that suppresses the movement of lithium ions, that is, the battery reaction, by softening at 30 ° C. to crush the micropores. By sandwiching this PE film between PP films having a higher softening temperature, even when the PE film is softened, the PP film retains its shape and prevents contact and short circuit between the positive electrode plate 2 and the negative electrode plate 3. Therefore, it is possible to surely suppress the battery reaction and ensure safety.

As the electrolytic solution, carbonate-based ones such as ethylene carbonate (EC), diethyl carbonate (DEC) and dimethyl carbonate (DMC), and organic solvents such as propylene carbonate (PC), γ-butyrolactone, tetrahydrofuran and acetonitrile. LiP as an electrolyte in a single solvent or a mixed solvent
A non-aqueous organic electrolytic solution in which one kind or two or more kinds of a lithium complex fluorine compound such as F ₆ or LiBF ₄ or a lithium halide such as LiClO ₄ is dissolved is preferably used. Such an electrolytic solution is filled in the battery case and impregnated into the internal electrode body 1.

Now, referring to FIG. 1, according to the manufacturing method of the present invention.
Shows the one embodiment of the lithium secondary battery obtained Te.
Here, the body member of the battery case 23 of the battery 10 have been used pipes, the lid 21, 22, battery
Battery so that both ends of the case ( pipe ) 23 are sealed
The case ( pipe ) 23 is caulked. When the battery case 23 composed of such pipes and the lid 21, 22, and insert the internal electrode body 1 into the battery case (pipe) 23, a drawn portion 24 provided at a predetermined position of the battery case (pipe) 23 The vertical movement of the internal electrode body 1 is suppressed by connecting the tab 5 to the internal terminal 14, and the lid 21
The operation of closing both ends of the battery case ( pipe ) 23 by means of 22 is easy and is preferable. The internal terminal 14 refers to a member for temporarily connecting the tabs 5 together to take out current from the internal electrode body 1.

In addition, the lid 21 on one end surface of the battery case 23
The cylindrical hole 7 of the winding core 6 in (the lid 21 is on the upper side)
An electrolytic solution injection port 11 is provided at a position corresponding to the outer extension of the. With such a structure, a nozzle for injecting and discharging an electrolytic solution (hereinafter referred to as "nozzle").
12 through the electrolyte injection port 11 and the cylindrical hole 7 to the battery
It is possible to insert the other end of the case 23 . It is preferable to perform both the injection and the discharge of the electrolytic solution by using one nozzle 12, but the nozzle for the electrolytic solution injection and the nozzle for the electrolytic solution discharge may be separately used .
Yes .

The battery case 23 is filled with an electrolytic solution.
When (injection) , it is placed in a space such as a glove box where the atmosphere can be adjusted. As described above, the battery case 23
Since both ends of are already sealed by the lids 21 and 22,
It is not necessary to seal the end portion of the battery case 23 after the filling (injection) of the electrolytic solution is completed, and therefore, it is not necessary to place a device or the like for performing the sealing work in the glove box or the like. Therefore, as a glove box or the like, the battery 10 (battery case
A small one can be used according to the size of the base 23) .

[0026] When the vacuum atmosphere using a vacuum pump the inside of the glove box or the like, since the electrolyte injection hole 11 in the battery case 23 is provided, the inner course also the same vacuum atmosphere of the battery case 23. Here, the degree of vacuum is 0.
It is preferable that the vacuum state is higher than about 1 torr (13.3 Pa).

In this state, the tip of the nozzle 12 is passed through the electrolytic solution inlet 11 and then through the cylindrical hole 7 of the winding core 6, and the end face of the internal electrode body 1 on the other end (bottom) side facing each other at a shallow depth. 1 to the position indicated by the broken line AA ′ in FIG. 1, and then the electrolytic solution is at least immersed in the internal electrode body 1, that is, the broken line B in FIG.
Inject up to the position indicated by B '. Here, the nozzle 12
Upon insertion of the tip to the bottom (cover 22) in the battery case 23, to suppress the bouncing of the electrolytic solution, it is Rukoto to start reliably impregnation of the electrolytic solution from the end face of the bottom side of the internal electrode body 1.

During the impregnation treatment with the electrolytic solution, it is preferable to maintain the degree of vacuum such that the electrolytic solution does not boil, and the degree of vacuum at this time largely depends on the physical properties of the solvent constituting the electrolytic solution to be used. Further, the nozzle 12 may be inserted into the battery case 23 in advance before the inside of the glove box or the like is made into a vacuum atmosphere. As the material of the nozzle 12, a metal or resin that is not corroded by the electrolytic solution is used, and the nozzle 12 is connected to an electrolytic solution storage tank placed outside the glove box or the like via a tube, a pipe or the like, and a metering pump or the like. Is used to deliver the electrolyte from the electrolyte storage tank. Of course, a stop valve or the like is provided in the root of the nozzle 12 or in the middle of the tube or pipe.

In this way, the electrolytic solution is supplied to the battery case 23.
By filling the inside of the internal electrode body 1 from the lower side to the upper side by filling from below, the bubbles generated from inside the internal electrode body 1 can escape through the space not impregnated with the electrolytic solution. Therefore, the impregnation with the electrolytic solution can be effectively performed. Thus
It is possible to shorten the injection time of the electrolytic solution, and in this case, even if the electrolytic solution contains a highly volatile solvent, the evaporation amount is minimized and the electrolytic solution characteristics deteriorate. Is avoided.

Normally, the internal electrode body is arranged in the center of the battery, and at this time, the core of the internal electrode body is necessarily arranged in the center of the battery. Therefore, when the battery 10 using the internal electrode body 1 of cylindrical (battery case 23), the electrolyte injection hole 11, as is shown in Fig 1, the external terminal 13 and the electrolyte injection hole 11 Integrated battery case 2
Be disposed at the central portion of the lid 21 of the 3 end surfaces of, as described later, is preferable from the viewpoint of facilitating a series connection of to what battery 10 obtained. Note that the external terminal 13, to retrieve the current of the battery to the outside, Ru member der disposed on the outside of the battery 10.

Further, the cross-sectional view of FIG. 2 is obtained by the present invention .
Another embodiment of the lithium secondary battery is shown , in which the electrolyte solution inlet 11 is formed in the center of the lid 21 on one end face of the battery case 23 and the external terminal 15 is formed as the electrolyte solution inlet. The structure may be such that it is arranged on the lid 21 at a position where it does not block 11.

On the other hand, paying attention to the battery case 23, as is shown in Fig 1, the tabs 5 which are connected to the internal terminal 14 and internal terminal 14, the cylindrical hole of the core 6, the axial direction ( A region corresponding to the outer extension in the length direction), that is, a region 98 from the electrolytic solution inlet 11 to the upper end of the core 6 of the internal electrode body 1, and a lower end of the core 6 to the lid 22 on the bottom side of the battery case 23. It is preferable to be arranged at a position outside the reaching region 99. This, as described above, it is necessary to out the nozzle 12 from the electrolyte injection opening 11, in order to place the internal terminal 14 and the tab 5 in a position that does not interfere with loading and unloading of the nozzle 12.

[0033] The internal terminal 14, as it is shown in Fig 1, but the present invention is arranged to be limited to one place on the one end surface of the battery case 23, as is shown in Fig 2, the battery case
Two may be provided on one end face of 23 , and more may be provided . Here, since metal members are preferably used for the lids 21 and 22, in this case, the internal terminal 14 and the external terminal 13 are necessarily electrically connected. On the other hand, the lid 2
When an insulating member is used as 1.22, the lid 21.2.
The electrical connection between the internal terminal 14 and the external terminal 13 may be made through the outer periphery of 2, or by providing a conductive hole in the lids 21 and 22.

By the way, according to the manufacturing method of the present invention,
It is difficult to visually observe the water level of the electrolytic solution as in the conventional case because the structure except the electrolytic solution inlet 11 has a closed structure. Therefore, the total injection amount of the electrolytic solution is as shown in FIG.
As explained using , the battery case with the top open
When the electrolytic solution is injected into the electrode 23 , it is sufficient to determine in advance the amount that will be the lowest water level when the internal electrode body is completely immersed in the electrolytic solution.

Further, as shown in FIG. 3, the battery case 2
It is possible to determine the end of impregnation with the electrolytic solution by measuring the AC impedance between each of the positive and negative external terminals 13 provided in No. 3 using the impedance analyzer 41 or the like. However, in this case, a solvent consisting of only an organic solvent containing no electrolyte is used as the electrolytic solution. By using such a solvent, the influence of the electrolyte on the AC impedance is eliminated, and the AC impedance directly reflects the impregnated area of the solvent.

FIG. 4 shows that the frequency 100
In Hz, exchanges with the filling of the electrolyte from the lower portion of the internal electrode body according to the present invention (injection), in the case of an electrolytic solution filling from the top as shown in the prior art of FIG. 7 (injection), and the electrolyte impregnation time It is an example of the result of having investigated the relationship with the change of impedance. Here, the electrolytic solution impregnation time refers to a time after the injection of the electrolytic solution is started in the vacuum atmosphere and then the vacuum atmosphere is maintained (until the inside of the battery case returns to the atmospheric pressure) . From FIG. 4, according to Hama conventional charging (injection), whereas it has required electrolyte impregnation time of about 2 hours to decrease the certain value AC impedance, Hama charging of the present invention
According to (injection) , the same impregnation treatment can be performed in about 30 minutes. In this way, it is possible to shorten the manufacturing time of the battery and ensure the characteristics of the electrolytic solution. Here, as the positive electrode substrate, a width of 200 mm, a length of 3600 mm,
200 mm wide and 4000 mm long as the negative electrode substrate
The internal electrode body manufactured by winding the above size is housed in a battery case having an inner diameter of 48 mmφ.
Further, as the solvent, an equal amount mixed solvent of EC and DEC is used.

Next, after the impregnation treatment with the electrolytic solution is completed,
The inside of the glove box or the like is purged with an inert gas such as nitrogen or argon, and then the excess electrolytic solution remaining in the battery case 23 is discharged to the outside using the nozzle 12. At this time, it is preferable that the tip of the nozzle 12 is inserted to the bottom of the battery case 23 in order to discharge more of the excess electrolytic solution filled in the cylindrical hole 7 and the space for arranging the tab 5. Here, as shown in the cross-sectional view of FIG. 5A, when a recess 31 is provided in the center of the inside of the lid 22 that forms the bottom of the battery case 23 , the electrolytic solution flows into the recess 31. As a result, it is possible to further discharge the remaining excess electrolytic solution. In addition,
As shown in the cross-sectional view of FIG. 5B, the lid portion 22 may be inflated so that the central portion thereof is convex outward, and the recess portion 31 may be formed.

After discharging the excess electrolytic solution, the electrolytic solution inlet 11 is closed in a glove box or the like. When the closure operation can be performed by a simple method, it is possible to use a small to match the size of the battery 10 (battery case 23) as a glove box or the like, electrodeposition described above
In addition to the fact that it is not necessary to mount a device for sealing the end of the pond case 23 , it is possible to reduce the equipment cost and the amount of purge gas used.

[0039] Here, the electrolyte injection hole 11 is set screws from the outside, it is preferred that can be closed by a simple sealing method such as filling the pressure inlet or sealing material. The screwing is carried out by inserting a screw that closes the electrolyte injection port 11 into the external terminal 13 shown in FIG.
As shown in the cross-sectional view, the electrolytic solution inlet 11 is formed in a screw shape, and the screw 16 complementary to the shape is used to stop the
It can be done easily. When the lid 21 on which the electrolytic solution inlet 11 is formed is thin, as shown in the cross-sectional view of FIG. 6B, the protrusion 1 having a screw on one side or both sides of the lid 21.
7 may be provided, and the screws 16 having a complementary shape may be used. Also,
As shown in the cross-sectional view of FIG. 6C, the press-fitting is performed by providing the electrolyte injection port 11 with a slight gradient such that the diameter becomes smaller inside the battery, and press-fitting the metal parts 18 and the like that fit into the shape. It can also be done by doing. Furthermore, the filling of the sealing material is
It is possible to use a resin or the like, and the electrolyte solution inlet 1
When the opening area of No. 1 is small, it is possible to melt the metal wax by heating the pole and seal the electrolyte solution injection port 11.

Now, when the electrolytic solution inlet 11 is sealed in this way, the battery 10 is completed. Here, as an application of the manufactured battery, for example, a motor drive such as an EV or an HEV is considered. In this case, to drive the motor 100-2
Since a voltage such as 00V is required, it is necessary to connect a plurality of batteries in series. Accordingly, it is shown to the battery 10 in FIG. 1
More than one time, as provided across the external terminals 13 of the positive and negative electrodes separately of the battery 10 (the battery case 23), and, when disposing these external terminals 13 in the center of the end face of the battery 10 (the battery case 23), This is preferable because it facilitates connection between batteries. That is, the electrolyte inlet 11 is the lithium secondary battery in FIG.
As are shown in a pond, it is preferably formed integral to the external terminal 13. External terminal 1 at the other end of battery 10 (battery case 23) in which electrolyte solution inlet 11 is not formed
3 may be arranged in the center of the end face.

The above has been described about the production method of the present invention, the present invention is not such limited to the embodiments described above. For example, the above-described embodiments but is intended with core of substantially circular cross section, a substantially elliptical, may be used winding core oval, etc., thus obtained cross section elliptical, oval, etc. In the battery case accommodating the internal electrode body, the electrolyte solution inlet may be provided on the outer extension of the cylindrical hole of the winding core. That is, the manufacturing method of the present invention can be applied not only to the manufacture of a cylindrical battery , but also to the manufacture of all batteries using a winding core having a cylindrical hole .

Regarding the battery case, if the battery is downsized, it becomes easy to assemble the battery by inserting the internal electrode body into the bottomed cylindrical container. In the this case, the bottom portion of the bottomed tubular container, it is possible to provide a recess portion from the beginning. In addition, the lithium secondary battery,
As a safety mechanism against battery rupture that may occur when the internal pressure of the battery rises during overcharge or overdischarge, the pressure release mechanism
Is generally arranged at the end of the battery.
In the production method is not及<br/> pot Succoth affect the arrangement of the pressure relief mechanism, for example, battery 10 according FIG 1 (cell case
Also in the case 23) , it is possible to form a rupture groove in the lids 21 and 22.

The production method of the present invention, that apply to production of batteries, especially having a relatively large capacity of more than 2Ah.

[0044]

As described above, according to the method for manufacturing a lithium secondary battery of the present invention, the filling (injection) of the electrolytic solution can be performed in a short time, so that the manufacturing cost can be reduced .
It is Rukoto stabilizing Hiite <br/> characteristics of the electrolytic solution can be stabilized battery characteristics. Further, since the excess electrolytic solution can be discharged and reused, the manufacturing cost can be reduced. In addition, excess electrolyte
From the battery in the residual amount is reduced, it is possible to proof <br/> stop the corrosion by the electrolyte of the various components disposed leakage and the battery electrolyte. In addition, since there is no need to seal the end face of the battery case after electrolyte injection under an inert atmosphere, miniaturization of such a glove box or the like, FIG Rukoto a reduction in consumption reduction and the inert gas equipment costs to Tomo and can,
It is possible to simplify the manufacturing process.

[Brief description of drawings]

FIG. 1 Lithium obtained by the production method of the present invention
It is explanatory drawing which shows one Embodiment of a secondary battery .

FIG. 2 is a lithium obtained by the production method of the present invention.
FIG. 9 is a cross-sectional view showing another embodiment of a secondary battery .

FIG. 3 is an explanatory diagram showing an example of an electrolytic solution impregnation time measuring method.

FIG. 4 is a graph showing the relationship between electrolytic solution impregnation time and changes in AC impedance.

FIG. 5 is a cross-sectional view showing an embodiment of a lid at the bottom of the battery case that is preferably used in the present invention.

FIG. 6 is a cross-sectional view showing an example of the form of an electrolyte solution injection port preferably used in the present invention.

FIG. 7 is an explanatory diagram showing an example of a filling method of an electrolytic solution by a conventional method.

FIG. 8 is a perspective view showing a general structure of a wound internal electrode body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Internal electrode body, 2 ... Positive electrode plate, 3 ... Negative electrode plate, 4 ... Separator, 5 ... Tab (current collecting means) , 6 ... Core, 7 ... Cylindrical hole , 1
0 ... Battery, 11 ... Electrolyte injection port, 12 ... For electrolyte injection /
Discharge nozzle, 13 ... External terminal, 14 ... Internal terminal, 15
External terminals, 16 ... Screws, 17 ... Projections, 18 ... Metal members, 21 ... (Upper) lid, 22 ... (Lower) lid, 23 ... Battery case (pipe) , 24 ... Drawing portion, 31 ... Recessed portion , 41
… Impedance analyzer, 70… Battery (battery case
S) , 71/72 ... End, 73 ... Nozzle, 98/99 ...
Outer region of the core.

Continuation of the front page (56) References JP-A-10-233233 (JP, A) JP-A-9-92238 (JP, A) JP-A-9-92335 (JP, A) JP-A-9-92250 (JP , A) JP 57-9074 (JP, A) JP 62-264563 (JP, A) JP 58-30073 (JP, A) JP 58-30072 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01M 10/40 H01M 2/26 H01M 2/30 H01M 2/36 101 H01M 2/36 107

Claims (7)

(57) [Claims] 1. A positive electrode plate and a negative electrode plate via a separator
The internal electrode body wound around the outer circumference of the cylindrical core was housed.
Use the electrolyte injection nozzle to put the electrolyte in the battery case.
Before injecting and impregnating the electrolytic solution in the battery case
A method for manufacturing a lithium secondary battery, wherein a lithium secondary battery having an internal electrode body housed therein is provided, wherein the internal electrode body is housed in the battery case.
In an area other than the area corresponding to the outer extension of the cylindrical hole of the winding core
Position that does not hinder the insertion and removal of the electrolyte injection nozzle
, One or more internal terminals and a plurality of terminals connected to the internal terminals.
Arranged and several places collector means, at least one end of the battery case, wherein the core of the cylindrical hole
The electrolyte injection port penetrates through the outermost part of the
By arranging a lid that, the inner at the other end of the battery case the sealed ends of the battery case, both shallow <br/> the tip of the electrolyte injection nozzle from the electrolyte injection hole and inserted to the position of the end surface of the electrode body, the electrolyte, the winding
From the lower portion of the internal electrode body via a core barrel bore, and injecting at least until the internal electrode body is immersed, then using an electrolytic solution discharge nozzle excess electrolyte remaining in the battery case Discharge the electrolyte to the outside
The impregnated internal electrode body is housed in a battery of 2 Ah or more.
A method for manufacturing a lithium secondary battery, comprising obtaining a lithium secondary battery having a pond capacity . Wherein the winding core and the electrolyte injection hole, claim 1, wherein the arrangement child in the center of the <br/> battery case
A method for producing the lithium secondary battery described above. 3. A manufacturing side of a lithium secondary battery according to claim 1 or 2, wherein the used also and the electrolyte solution discharge nozzle and the electrolyte injection nozzle at one nozzle
Law . 4. Insert until the tip of the electrolyte injection nozzle or the electrolyte solution discharge nozzle at the other end of the battery case, according to claim 1, characterized in that the injection or discharge of the electrolyte 4. The method for manufacturing a lithium secondary battery according to any one of items 1 to 3. 5. only set the recess inside the central portion of the other end of the battery case, the excess electrolyte liquid remaining in said recess,
The method for producing a lithium secondary battery according to claim 4, wherein the discharge is performed using the electrolyte solution discharge nozzle. To 6. After ejection of the surplus electrolyte, wherein the electrolyte injection hole, screwing from the outside, any one of claims 1-5, characterized in that for closing the filling pressure inlet or sealing material The method for manufacturing the lithium secondary battery according to 1. 7. A pipe as the body member of the battery case
There use a so that the lid closes both ends of the pipe,
After sealing the battery case by caulking the end portion of the pipe, the lithium secondary battery according to any one of claims 1 to 6, characterized in that the injection / discharge of the electrolyte Manufacturing method .