JPH1145700A - Sealed non-aqueous electrolyte battery - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In response to gas pressure in a battery that occurs at the time of overcharging, etc., current cutoff is appropriately performed easily, and even if a drop or impact is encountered, malfunction of current cutoff may occur. Provide highly reliable sealed non-aqueous electrolyte batteries. SOLUTION: A power generating element 8 comprising a negative electrode constituent member, a separator member, a positive electrode constituent member, and a non-aqueous electrolytic solution, and a one-side open type outer can 7 which contains the power generating element 8 and serves as one electric terminal. Correspondence between a sealing lid 9 which has a terminal plate 9a serving as the other electric terminal and an opening of the outer can 7 insulated in an insulating manner and the other electric terminal 9a of the sealing lid 9 and the power generating element 8 A foldable lead wire portion 11 for electrically connecting the electrode components to be formed, and a foldable portion 11a of the lead wire 11 which is arranged inside the fold portion 11a of the lead wire 11 and presses the power generating element 8 can be accommodated. An enclosed nonaqueous electrolyte battery comprising: an electrode pressing plate 12 having a concave portion; and a current interrupting mechanism 9c, 13 for electrically connecting the lead wire 11 and flowing / interrupting current. is there.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte battery, and more particularly to a sealed non-aqueous electrolyte battery with improved safety.

[0002]

2. Description of the Related Art In recent years, attention has been paid to a sealed nonaqueous electrolyte secondary battery which is small, lightweight, has a high energy density and can be repeatedly charged and discharged in response to the development and development of electronic devices. This type of nonaqueous electrolyte secondary battery includes (a) a negative electrode using lithium or a lithium alloy as a negative electrode active material, and an oxide, sulfide, or selenide such as molybdenum, vanadium, titanium, or niobium as a positive electrode active material. A lithium secondary battery equipped with a positive electrode and a non-aqueous electrolyte as a power generation element (battery power generation element), or (b) using carbon as a negative electrode active material and lithium cobalt oxide as a positive electrode active material,
Lithium ion secondary batteries using lithium nickel oxide and lithium manganese oxide are known.

The above non-aqueous electrolyte secondary batteries such as lithium ion batteries have a lower self-discharge than silver batteries and alkaline batteries, and thus can withstand long-term use.
Used for power supplies such as clocks. In addition, secondary batteries that are incorporated in various device systems such as portable telephones and portable imaging devices and used as an operating power supply are also required as power supplies as portable telephones and portable imaging devices become smaller and lighter. Lithium ion batteries with high energy density are required.

In a lithium ion battery, a composite metal oxide containing lithium (Li) and cobalt (Co) as main components is used as a positive electrode active material, and a carbonaceous material such as coke, graphite, and an organic fired body is used. For the negative electrode active material,
Further, propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, 1,2-dimethoxyethane, γ-butyrolactone,
In an organic solvent such as tetrahydrofuran, LiCl0 _4, Li
A non-aqueous electrolyte formed by dissolving lithium salts such as BF ₄ , LiAsF ₆ , and LiPF ₆ is used.

The output characteristics of this type of non-aqueous electrolyte battery are proportional to the area of the positive electrode and the negative electrode facing each other with the separator interposed therebetween. The facing area is set wide by stacking a plurality of layers (lamination type) or winding (winding) in a roll shape.

Incidentally, the nonaqueous electrolyte battery is required to have a stable hermeticity and airtightness over a long period of time. The development of a high sealing structure is being promoted.

FIG. 4 is a cross-sectional view showing a main part of a sealing structure in which a sealed non-aqueous electrolyte secondary battery is sealed by a beat processing / crimp sealing method. In FIG. 4, reference numeral 1 denotes an outer can forming one electrode terminal. The inner can 1 having one end opened is held by an upper die of a beading machine, and the outer can is pressed from below. A groove 1a having a depth of about 1 mm, that is, a pedestal for receiving (holding) the peripheral portion of the sealing lid 2 is formed by applying a grooving roller to 1. After inserting and disposing the required power generating element 3 and the holding plate 4 in the outer can 1, the peripheral portion of the sealing lid 2 is positioned and arranged on the base 1a, and the opening of the outer can 1 is opened via the gasket 5. The part 1b is bent inward (crimped) and hermetically sealed.

[0008] Here, the sealing lid 2 is configured as follows. That is, first, the sealing lid 2 is provided with a terminal plate 2a serving as the other electric terminal with respect to the one electric terminal also serving as the outer can 1, and an annular excessively large ring disposed in contact with the inner peripheral portion of the terminal plate 2a. A current protection element (for example, a PTC element) 2b is provided. When the battery temperature rises due to overcharging or the like, the overcurrent protection element 2b increases the resistance and controls the current flow.

Next, a diaphragm provided with a projection 2c 'substantially at the center on the inner peripheral portion of the overcurrent protection element 2b.
2c is arranged so that its peripheral edge is in contact, and further,
A configuration is adopted in which a stripper 2e having an opening corresponding to the protrusion 2c 'of the diaphragm 2c is arranged on the inner peripheral edge of the diaphragm 2c via an insulator layer (insulating ring) 2d.

Further, a thin conductive film 2f, which is easily broken by pressure, is disposed inside the stripper 2e so as to seal the opening of the stripper 2e. Lead wire 6 is electrically connected.

The projection 2c 'of the diaphragm 2c
When the internal pressure of the battery rises due to electrolysis or a rise in battery temperature due to electrolysis or a rise in battery temperature, the battery undergoes deformation due to the pressure. A severe interruption is performed.

A lead wire 6 led out from the power generating element 3 is provided on a holding plate 4 for preventing and suppressing the movement of the power generating element 3 out of the outer can 1 in contact with the end face of the power generating element 3. It is led out through the through hole 4a and is folded on the conductive film 2f side. Here, the lead wire 6 is generally connected to the conductive film 2f on the side of the sealing lid 2 and the work of caulking and sealing the opening 1b of the outer can 1 with the sealing lid 2. Is set longer so that the battery can be easily assembled and assembled, while being folded in order to make the accommodating space as small as possible.

[0013]

However, the structure of the secondary battery having the power generating element 3 and the sealing lid 2 has the following problems. That is, the lead wire 6
Is placed in the outer can 1 in a folded state, and is electrically connected to the sealing lid 2 side. When the secondary battery receives a certain impact or more due to drop or vibration, the power generating element 3 Cannot be prevented or avoided entirely in the exterior can 1.

In other words, in the case of an ordinary handling impact, the pressing plate 4 arranged and installed on the end face of the battery element 2
Thus, it is possible to cope with the movement of the power generating element 3 inside the outer can 1. However, if the impact strength is high, even if the holding plate 4 is present, the space where the folded lead wire 6 is stored and arranged. It compresses itself. Therefore, the lead wire 6 in the folded state is pressed as it is in the direction of the sealing lid 2, causing deformation of the stripper 2 e and the like, and the sealing lid 2 tends to be distorted.

FIG. 5 is a cross-sectional view schematically showing a state in which the sealing lid 2 is distorted in the configuration of the secondary battery. When the sealing lid 2 is distorted, the sealing lid 2 with the current cutoff mechanism is deteriorated in sealing performance of the secondary battery due to deformation of the stripper 2e or distortion of the sealing lid 2. That is, electrolyte leakage in the outer can 1 or the lead wire 6
Connection failure that the connection between the diaphragm 4c and
This may cause a malfunction of the current cutoff, thereby greatly reducing the reliability of the secondary battery.

The battery may be used in a single case or in a plurality (packed battery).
In particular, a portable power supply is used in the form of a battery pack. In this case, even if a single cell in the battery pack causes liquid leakage or the like, it may cause damage or damage to peripheral devices.

The present invention has been made in view of such circumstances, and responds to the gas pressure in the battery which occurs at the time of overcharging, etc., so that the current can be easily cut off appropriately, and a fall, an impact, etc. are encountered. It is another object of the present invention to provide a highly reliable sealed non-aqueous electrolyte battery that does not cause a malfunction such as a current interruption.

[0018]

According to a first aspect of the present invention, there is provided a power generating element comprising a negative electrode constituting member, a separator member, a positive electrode constituting member, and a non-aqueous electrolyte, and a built-in power generating element,
And one end opening type outer can which becomes one electric terminal, and the opening of the outer can is insulated and sealed, and a sealing lid having a terminal plate which becomes the other electric terminal, and the other of the sealing lid. A foldable lead wire portion for electrically connecting an electrical terminal and a corresponding electrode constituent member of the power generation element, and a foldable lead wire portion disposed inside the fold portion of the lead wire for holding the power generation element and accommodating the fold portion of the lead wire. A sealed non-aqueous electrolyte battery comprising: an electrode pressing plate having a concave portion; and a current interrupting mechanism for electrically connecting the lead wires and for interrupting and flowing a current.

According to a second aspect of the present invention, there is provided the sealed nonaqueous electrolyte battery according to the first aspect, wherein the electric terminal plate of the sealing lid is provided with a ring-shaped excessive current protection element which is electrically connected and arranged. It is characterized by being.

According to a third aspect of the present invention, in the sealed nonaqueous electrolyte battery according to the first or second aspect, the current interrupting mechanism has a diaphragm provided with a projection at a substantially central portion, and an inner peripheral portion of the diaphragm. A stripper disposed with an insulator layer interposed therebetween, and a region corresponding to the projection is opened, and disposed so as to seal the opening of the stripper, and the lead wires are electrically connected, and the internal pressure of the battery increases. It is characterized by having a conductive thin film that breaks and allows current flow and cutoff.

According to a fourth aspect of the present invention, in the sealed nonaqueous electrolyte battery according to any one of the first to third aspects, the electrode pressing plate is an annular body forming a concave portion and a flat plate forming a bottom wall surface. It is characterized by comprising.

In the present invention, the outer can containing the power generating element and serving as one terminal (a positive terminal or a negative terminal) is made of, for example, stainless steel, iron or aluminum.

In the present invention, the sealing lid has at least a terminal plate serving as the other terminal (negative electrode terminal or positive electrode terminal), and further has an annular excessive current protection element. Here, the terminal plate is made of, for example, stainless steel,
It is a thin plate made of iron or aluminum with a thickness of about 0.2 to 1 mm.

Further, usually, a current interrupting mechanism is mounted and arranged on the sealing lid, and the structure or configuration of the current interrupting mechanism is not particularly limited. For example, it has a structure having a diaphragm provided with a projection at a substantially central portion, an insulator layer, a stripper having a substantially central opening, and a conductive thin film disposed so as to seal the opening of the stripper. Here, the diaphragm is a thin plate made of, for example, stainless steel or aluminum and having a thickness of, for example, about 0.1 to 0.3 mm. The part has a structure in which the surface is protruded outward. Note that the current interrupting mechanism is not limited to the above-described configuration as long as a required current interrupt can be performed in accordance with an increase in pressure in the battery, and any means and configuration may be used. For example, when connecting a foldable lead wire to a terminal plate forming a part of a sealing lid, an airtight chamber type current interrupt mechanism that deforms by compression due to an increase in battery pressure and connects / disconnects the lead wire may be used. .

Further, the stripper is made of, for example, stainless steel or aluminum and has a thickness of, for example, 0.1 to 0.1 mm.
This is a structure in which a thin plate having a thickness of about 1 mm is formed so as to be engaged with the diaphragm, and an opening is provided so that a convex surface (projection) of the diaphragm can be fitted. The opening of the stripper is sealed with a conductive film having a thickness of about 0.05 to 0.2 mm, and the protruding surface (projection) of the diaphragm is in contact with the conductive film, while the conductive film is in contact with the conductive film. Is a foldable lead wire (lead piece), one end of which is connected to the power generation element
Are joined. Note that the conductive film can be omitted by processing the material thickness of a portion corresponding to the opening to be thin. The lead wire is made of a metal such as aluminum.

The lead wire for electrically connecting to the sealing lid side is led out, while the electrode pressing plate for preventing the movement of the power generating element is an insulating resin plate made of, for example, fiber or cloth as a reinforcing material. is there. Here, the electrode holding plate is
Instead of a simple flat plate, a region facing the fold of the foldable lead wire is made concave so that the fold of the lead wire can be accommodated.

In the present invention, the positive electrode active material is an active material capable of dedoping and doping lithium, for example, a composite oxide (LiCoO ₂ , L
iNiO ₂ and LiMn ₂ O ₄ ). Examples of the negative electrode active material include graphite, needle coke, mesophase spheroidal carbon, mesophase pitch-based carbon fiber, and a fired body of an organic polymer. Then, these active materials are collected into a current collector foil, for example, having a thickness of 5 to
The positive electrode and the negative electrode are formed in a thin plate or tape shape by coating on at least one surface of a 50 μm copper, nickel, aluminum, stainless steel or other metal foil.

On the other hand, the non-aqueous electrolyte used in the present invention includes, for example, ethylene carbonate, propylene carbonate, butylene carbonate, γ-butyrolactone, sulfolane, acetonitrile, 1,2-dimethoxymethane, 1,3-dimethoxypropane, dimethyl ether, Lithium perchlorate (LiClO ₄ ) and hexafluorophosphoric acid are added to an organic solvent (non-aqueous solvent) comprising at least one selected from the group consisting of tetrahydrofuran, 2-methyltetrahydrofuran, dimethyl carbonate, diethyl carbonate and ethyl methyl carbonate. Lithium salt (electrolyte) such as lithium (LiPF ₆ ), lithium borofluoride (LiBF ₄ ), lithium arsenic hexafluoride (LiAsF ₆ ), lithium trifluoromethanesulfonate (LiCF ₃ SO ₃ ) is about 0.5 to 1.5 mol / l. Generally, a dissolved non-aqueous electrolyte is used.

Instead of the non-aqueous electrolyte, an ion-conductive solid electrolyte such as a polymer solid electrolyte in which a lithium salt is combined with a polymer compound can be used. Furthermore, as the separator that insulates and separates between the negative electrode and the positive electrode, for example, a nonwoven fabric or a porous film of a polyolefin-based resin such as polyethylene or polypropylene can be used.

According to the first to fourth aspects of the present invention, excellent airtightness prevents liquid leakage and the like, and even if the power generating element moves due to impact, the folded state connecting the power generating element and the conductive thin film. Lead wire is not compressed to the sealing lid side,
The state where it is housed in the concave portion of the electrode holding plate is adopted. That is, even if the power generation element moves by impact, the phenomenon that the sealing lid is deformed by the compression of the space where the foldable lead wire is arranged is easily and reliably avoided. Accordingly, good sealing performance is maintained, and insulation failure due to current interruption malfunction or occurrence of short circuit between electrodes due to crushing of the end face of the power generating element is prevented, thereby functioning as a highly reliable sealed nonaqueous electrolyte battery. .

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS. 1, 2 and 3. FIG.

FIG. 1 is an enlarged sectional view showing a main part of a cylindrical nonaqueous electrolyte secondary battery according to the first embodiment.

In FIG. 1, reference numeral 7 denotes an iron outer can also serving as a negative electrode terminal in which a non-aqueous electrolyte-based power generating element 8 is provided, and 9 denotes a synthetic resin opening in which the outer can 7 in which the power generating element 8 is provided is formed. This is a sealing lid having a terminal plate 9a serving as a positive electrode terminal that is hermetically sealed by caulking and fixing via a gasket (insulating packing material) 10. 11 is the terminal plate of the sealing lid 9
9a and a foldable lead wire for electrically connecting the positive electrode side of the power generating element 8, and 12 is a folded portion 11a of the lead wire 11.
Is disposed inside the power generation element 8 and the lead wire
It is an electrode pressing plate having a concave portion 12a capable of accommodating 11 fold portions 11a. In the above configuration, the power generation element 8 is
Complex oxides containing lithium and cobalt, such as LiCoO
₂ , LiNiO ₂ , LiMn ₂ O _4, etc., a positive electrode constituting material obtained by applying at least one surface of an aluminum foil having a thickness of 30 μm and a thickness of, for example, mesophase pitch-based carbon fiber.
A negative electrode component material coated on at least one side of a 30 μm copper foil and a separator component material made of, for example, a polyethylene resin porous membrane are formed into a wound body (wound body). (LiPF ₆ ) as the electrolyte,
An organic electrolyte solution prepared by dissolving this in a mixed solvent of ethylene carbonate and methyl ethyl carbonate (volume ratio 1: 2) is impregnated.

Further, the sealing lid 9 is provided with a ring-shaped excessive current protection element 9b disposed in contact with and arranged on the inner peripheral portion of the terminal plate 9a.
On the inner peripheral edge of the excessive current protection element 9b, a diaphragm 9c provided with a projection 9c 'at a substantially central portion is disposed so as to face the peripheral edge. In addition, the diaphragm
A configuration is adopted in which a stripper 9e having an opening 9e 'in a region corresponding to the projection 9c' of the diaphragm 9c is disposed on the inner peripheral edge of 9c via an insulator layer (insulating ring) 9d.

Further, the opening 9 of the stripper 9e
A conductive thin film 9f is arranged inside the stripper 9e so as to seal e ′, and a foldable lead wire 11 derived from the power generation element 8 is electrically connected to the conductive thin film 9f. ing. The conductive thin film 9f falls into an overcharged state or the like, and when the internal pressure of the battery rises due to electrolysis or battery temperature rise, the conductive thin film 9f undergoes deformation / rupture under the pressure. Accompanied diaphragm 9c
Move the projection 9c ', move away from the conductive thin film 9f, and electrically connect / disconnect.

The foldable lead wire 11 led out of the power generating element 8 contacts the end face of the power generating element 8 to form a holding plate 12 for preventing and suppressing the power generating element 8 from moving inside the outer can 7. The pressure valve is led out through the through hole 12a
It is folded in layers on the 9f side. The pressing plate 12 has a recessed portion facing the fold 11a of the foldable lead wire 11 so that the fold 11a can be accommodated therein. The folded portion 11a does not protrude toward the sealing lid 9 side, so that the sealing lid 9 is not compressed.

When the opening 7b of the outer can 7 is hermetically sealed with the sealing lid 9, the tip of the foldable lead wire 11 is joined to the projection 9c 'of the diaphragm 9c of the sealing lid 9. After that, the folded portion 11a of the lead wire 11 is held and pressed into the pedestal 7a of the outer can 7 in which the gasket 10 is arranged so that the folded portion 11a of the lead wire 11 is housed in the recessed region of the holding plate 12. Next, the opening 7b of the outer can 7 is bent inward (caulking) and hermetically sealed. Here, the non-aqueous electrolyte secondary battery having the above configuration is a cylindrical battery having an outer diameter of 18 mm, a height of 65 mm, and a battery capacity of 1400 mAh.

FIG. 2 is a sectional view showing the structure of a main part of a cylindrical nonaqueous electrolyte secondary battery according to a second embodiment. In the case of this embodiment, a part of the configuration shown in FIG.
Similarly, safety measures are taken. That is, the presser plate 12 of the end portion of the power generating element 8 housed, mounted in the outer can 7, a plate 12 ₁ of the role of preventing the protruding contact with the end face of the power generating element 8, the folded portion 11a of the lead wire 11 except that a two-layer structure of the plate 12 ₂ to the housing and roles, forms a structure similar to that of the first embodiment.

[0039] In the case of adopting the second configuration example, that the electrode pressing plate 12, a plate 12 _first serves to prevent the protrusion of the power generating element, the split plate for accommodating the folded portion 11a of the lead wire 11 If you double-layer structure of a 12 _2, can be formed without depending on such complicated injection molding method is advantageous in mass production and cost.

As a comparative example, the structure of the first embodiment is the same as that of the first embodiment except that the electrode pressing plate is a simple flat plate (an electrode pressing plate having no space for accommodating the folded lead wire portion). A non-aqueous electrolyte secondary battery having a cylindrical shape was prepared.

With respect to the cylindrical non-aqueous electrolyte secondary batteries according to the first and second embodiments and the cylindrical non-aqueous electrolyte secondary battery according to the comparative example, after assembling and charging 100 batteries each, The internal resistance and weight of the battery were measured. Then 1.
A drop test is performed in any direction from a height of 9 m. The drop test evaluates the increase in internal resistance due to impact (insulation evaluation), the evaluation of voltage drop due to short circuit, and the evaluation of leakage of secondary batteries (liquid tightness evaluation). Each went.

In the cylindrical non-aqueous electrolyte secondary batteries according to the first and second embodiments, after the drop test,
In any case, no increase in internal resistance and no decrease in voltage were observed,
No liquid leakage was observed, and there was no change in weight. Further, after the drop test and evaluation, the cylindrical non-aqueous electrolyte secondary battery is disassembled, and a diaphragm 9c forming a part of the sealing lid 9, a joining portion of the lead wire 11 to the diaphragm 9c,
Deformation (distortion) of stripper 9e forming part of sealing lid 9
Observation of the condition (1) showed that the connection of the lead wire 11 to the diaphragm 9c was not detached, and that the stripper 9e was not deformed.

That is, in the case of the cylindrical non-aqueous electrolyte secondary batteries according to both embodiments, no deformation (distortion) of the sealing lid 9 due to dropping / impact was observed, and the sealing reliability of the batteries was reduced. The sealed non-aqueous electrolyte battery was excellent in battery performance and did not cause insulation failure due to current interruption malfunction.

On the other hand, in the case of the cylindrical non-aqueous electrolyte secondary battery of the comparative example, in the drop test, an increase in the internal resistance occurred, which made it impossible to measure 40 batteries. Voltage drop was confirmed. In addition, non-aqueous electrolyte secondary batteries
For 40 batteries out of 100 batteries, leaks and battery odors that would reduce battery weight were confirmed.

After the drop test and evaluation, the cylindrical non-aqueous electrolyte secondary battery of the comparative example was disassembled, and the state of the joint portion of the lead wire to the diaphragm forming a part of the sealing lid and the state of the electrode pressing plate were obtained. According to the observations, in the battery with increased internal resistance, the connection of the lead wire to the diaphragm was detached, and in the battery with low voltage, the electrode pressing plate was damaged, and the end face of the power generation element in contact with this was damaged. Had been crushed. Further, in each case, deformation of the stripper was observed.

FIG. 3 is a cross-sectional view showing the main structure of a sealed nonaqueous electrolyte battery according to a third embodiment. The structure is basically the same as that of the above example except that the structure of the current interrupting mechanism is changed. It has a similar configuration. That is, the current interruption is made by utilizing the deformation of the airtight chamber container due to the internal pressure of the battery, and is formed by the conductive container main body 13a having a Ω-shaped cross section and the diaphragm 13b that hermetically seals the opening of the conductive container main body 13. A projection provided at the end of the lead wire 11
A configuration is adopted in which 11b is disposed so as to be able to contact and separate from the outer surface of the diaphragm 13b. Then, it is attached to the terminal plate 9a forming a part of the sealing lid body 9 adjacent to the outside of the stripper 9e.
The configuration is such that the projection 11b of the foldable lead wire 11 is attached and arranged so as to be able to contact and separate from the inside of the stripper 9e via the arranged current interruption mechanism 13. In this configuration, when the internal pressure of the battery increases with respect to the atmospheric pressure in the fixed airtight chamber container 13, the diaphragm 13b is pushed up, and the terminal (projection) 11b of the foldable lead wire 11 separates from the diaphragm 13b, and Is shut down.

Although the above description has been given of the example of the cylindrical nonaqueous electrolyte battery, various modifications can be made without departing from the gist of the invention. For example, combinations and forms other than those exemplified above, such as active materials of the positive electrode and the negative electrode, configurations of the positive electrode and the negative electrode, shapes of separators, and secondary batteries, can be adopted.

[0048]

According to the present invention, the space for accommodating the folded portion of the lead wire connecting the one side of the built-in power generating element to the one side of the built-in power generating element is provided on the electrode pressing plate in order to connect the sealing lid to one terminal. I have it. In other words, when sealing the sealed part of the outer can in which the power generation element is incorporated and mounted, with the sealing lid body to which the lead wire is connected, the lead wire which is set to be longer to facilitate the work is folded. A space for accommodating the folded portion of the lead wire even when housed in the outer can is formed in the electrode pressing plate in advance.

When the enclosed non-aqueous electrolyte battery is subjected to a severe impact and the built-in / mounted power generating element is moved, the folded portion of the lead wire is easily inserted into the storage space of the electrode pressing plate. And stored without protruding. Therefore, the sealed non-aqueous electrolyte battery is impacted,
Even in the event that the power generation element moves, the action of the folded lead wire pushing up the sealing lid is absorbed in the space for accommodating the lead wire of the electrode pressing plate.
Deformation (distortion) of the sealing lid due to the upward pressure is avoided.

Here, avoiding and suppressing the occurrence of deformation (distortion) of the sealing lid body not only contributes to highly reliable battery sealing, but also eliminates insulation failure due to malfunction of current interruption, and furthermore, power generation. A sealed nonaqueous electrolyte battery free from short-circuits due to crushing of the element end faces is provided.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view illustrating a main configuration of a nonaqueous electrolyte battery according to a first embodiment.

FIG. 2 is an enlarged cross-sectional view illustrating a main configuration of a nonaqueous electrolyte battery according to a second embodiment.

FIG. 3 is an enlarged cross-sectional view showing a main configuration of a nonaqueous electrolyte battery according to a third embodiment.

FIG. 4 is a cross-sectional view showing a configuration example of a main part of a conventional nonaqueous electrolyte battery.

FIG. 5 is a cross-sectional view schematically showing a state of deformation of a sealing lid due to a rise in battery pressure of a conventional nonaqueous electrolyte battery.

[Explanation of symbols]

1,7 ... Outer can 2,9 ... Sealing lid 2a, 9a ... Terminal plate 2b, 9b ... Excessive current protection element 2c, 9c, 13b ... Diaphragm 2c ', 9c' ... Protrusion of diaphragm 2d, 9d ... Insulator layer 2e, 9e ... Stripper 2f, 9f ... Conductive thin film 3, 8 ... Power generation element 4, 12 ... Electrode holding plate 5, 10 ... Gasket 6, 11 ... Folding lead Wire 11a: Folded lead wire folded portion 11b: Folded lead wire protrusion 12a: Depressed portion of electrode holding plate (Lead wire folded portion storage space)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Hasebe 72 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Kawasaki Office (72) Inventor Yuichi Sato 72 Horikawa-cho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Corporation Inside the Kawasaki Office (72) Inventor Masahiro Ito 72 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Higashi-Shiba Kawasaki Office (72) Inventor Kei Shimoyamada 72, Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Higashi-Shibakawasaki Office, Inc.

Claims (4)

[Claims] A power generating element comprising a negative electrode constituent member, a separator member, a positive electrode constituent member, and a non-aqueous electrolytic solution; a one-side open type outer can that incorporates the power generating element and serves as one electric terminal; An opening of the outer can is insulated insulated, and a sealing lid having a terminal plate serving as the other electrical terminal, and the other electrical terminal of the sealing lid and a corresponding electrode component of the power generating element are electrically connected. A foldable lead wire portion, an electrode pressing plate disposed inside the fold portion of the lead wire for holding a power generating element, and having a concave portion capable of accommodating the fold portion of the lead wire; A sealed non-aqueous electrolyte battery having a current cutoff mechanism for connecting and interrupting the flow of current. 2. The sealed non-aqueous electrolyte battery according to claim 1, wherein the electric terminal plate of the sealing cover has an annular excessive current protection element electrically connected thereto. . 3. A current interrupting mechanism comprising: a diaphragm provided with a projection at a substantially central portion thereof; a stripper disposed at an inner peripheral portion of the diaphragm with an insulator layer interposed therebetween; and a region corresponding to the projection being opened. And a conductive thin film arranged to seal an opening of the stripper, wherein the lead wire is electrically connected, and is broken by a battery internal pressure to interrupt a current. The sealed nonaqueous electrolyte battery according to claim 2. 4. The closed non-aqueous electrolysis according to claim 1, wherein the electrode pressing plate is composed of an annular body forming a concave portion and a flat plate forming a bottom wall surface. Liquid battery.