JP4199948B2 - Electrode extraction structure of sheet-like secondary battery - Google Patents

Electrode extraction structure of sheet-like secondary battery Download PDF

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Publication number
JP4199948B2
JP4199948B2 JP2001353090A JP2001353090A JP4199948B2 JP 4199948 B2 JP4199948 B2 JP 4199948B2 JP 2001353090 A JP2001353090 A JP 2001353090A JP 2001353090 A JP2001353090 A JP 2001353090A JP 4199948 B2 JP4199948 B2 JP 4199948B2
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lead
bag
sheet
secondary battery
internal
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JP2003151529A (en
Inventor
和典 小沢
直子 藤谷
慎一 近野
隆雄 高崎
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エナックス株式会社
ハイメカ株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility
    • Y02T10/7005Batteries
    • Y02T10/7011Lithium ion battery

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrode lead-out structure of a sheet-like secondary battery, and is not particularly limited, but has a large capacity that is suitably used for applications such as electric vehicles, UPS (uninterruptible power supply), load leveling, etc. The present invention relates to an electrode lead structure of a sheet-like secondary battery.
[0002]
[Prior art]
As a secondary battery having a large capacity and energy per volume and weight and capable of achieving a high energy density, for example, a lithium ion secondary battery of a non-aqueous electrolyte secondary battery using lithium or a lithium alloy is known. Since this lithium ion secondary battery has advantages such as no memory effect and low self-discharge, various electric devices such as camera-integrated VTR devices, audio equipment, portable computers, mobile phones, etc. -It is used in a wide range of fields such as electronic equipment, communication equipment, optical equipment, and acoustic equipment.
[0003]
This lithium ion secondary battery generally includes a sheet-like positive electrode composed of a sheet-like positive electrode current collector and a positive electrode active material applied to the surface, a sheet-like negative electrode current collector, A sheet-like internal electrode pair formed by laminating a sheet-like negative electrode composed of a negative electrode active material applied on the surface via a separator, and this internal electrode pair is covered in a sealed state And a positive electrode lead and a negative electrode lead respectively connected to a positive electrode terminal and a negative electrode terminal provided in the battery case from each positive electrode and each negative electrode of the internal electrode pair in the battery case. Lithium escapes from the positive electrode active material of the positive electrode into the electrolyte as lithium ions during charging, enters the negative electrode active material of the negative electrode, and enters this negative electrode active material during discharge. By does it lithium ions are released into the electrolyte solution, the flow returns to the positive electrode active material in the positive electrode again, and subjected to a charge and discharge.
[0004]
Such a lithium ion secondary battery is expected to be a large-capacity secondary battery used in the field of, for example, an electric vehicle because it can achieve a high energy density. Many developments and proposals have already been made. Has been done.
In addition, the secondary battery of relatively small capacity used in the field of electric / electronic equipment, communication equipment, optical equipment, acoustic equipment, etc., as well as the secondary battery of relatively large capacity used in the field of this electric vehicle, etc. Also for batteries, there are increasing demands for miniaturization, weight reduction, thickness reduction, freedom of shape, and the like.
[0005]
Therefore, in the past, as for the secondary battery of a relatively small capacity, particularly a lithium ion secondary battery, as the battery case, heat having excellent electrolytic solution resistance and heat sealability such as polyethylene and polypropylene is provided on the inner surface side. An inner layer made of a plastic resin, an intermediate layer made of a metal foil excellent in flexibility and strength such as aluminum foil in the middle, and an insulating resin excellent in electrical insulation such as a polyamide resin on the outer surface side Forming a flexible bag-like envelope using a three-layer laminate film with an outer surface layer made of a sheet, and encapsulating a sheet-like internal electrode pair and an electrolyte in the bag-like envelope In addition, lightweight, thin, and flexible sheet-like lithium ion secondary batteries have been proposed (see, for example, JP-A-2001-229,924, JP-A-2000-133,220, Table 98 / 042,036).
[0006]
The conventional sheet-like lithium ion secondary battery B generally has a sheet-like internal electrode formed by alternately laminating sheet-like positive electrodes 1a and sheet-like negative electrodes 1b via separators 1c. It is formed of a laminate film having a pair 1, an inner layer 2a made of thermoplastic resin, an intermediate layer 2b made of metal foil, and an outer surface layer 2c made of insulating resin, and the internal electrode pair 1 and the electrolyte are sealed inside. A flexible bag-like outer package 2 accommodated in a state, and a pair of positive electrode leads 3a for individually connecting each positive electrode 1a and each negative electrode 1b of the internal electrode pair 1 inside the bag-like outer package 2 And the negative electrode lead 3b. The pair of positive electrode lead 3a and negative electrode lead 3b penetrates the heat seal portion 4 of the bag-like outer package 2 in an airtight manner and is fixed to the heat seal portion 4. Heat sheath of lead 3a and negative electrode lead 3b A portion that penetrates the handle portion 4 and protrudes to the outside is used as a terminal or an external lead.
[0007]
However, in such an electrode lead-out structure, the positive electrode lead 3a and the negative electrode lead 3b drawn to the outside of the bag-shaped outer package 2 as external leads or terminals are between the bag-shaped outer package 2 and the bag-shaped outer package 2. 2 is only fixed by heat sealing of the inner surface layer 2a made of a thermoplastic resin, and the adhesive strength between the positive electrode lead 3a and the negative electrode lead 3b and the bag-like outer package 2 is not always sufficient, In particular, as the battery capacity increases, the weight of the battery inevitably increases, and only the adhesion by heat sealing between the positive electrode lead 3a and the negative electrode lead 3b and the bag-shaped outer package 2 is inferior in reliability. Further, when the positive electrode lead 3a is a commonly used aluminum material, the adhesion reliability of the aluminum positive electrode lead 3a is further inferior, and the positive electrode lead 3a and the bag shape are in use during use. A gap is formed between the heat seal portion of the package 2 and in some cases, moisture enters the gap to generate hydrofluoric acid, thereby impairing the function as a battery, or the electrolytic solution in the bag-shaped outer package 2 May leak to the outside.
[0008]
In addition, when the battery capacity increases and, as a result, a large current discharge is required, it is necessary to increase the cross-sectional area of the lead that passes through the bag-like outer package from the internal electrode pair (positive electrode and negative electrode) and is drawn to the outside. As the cross-sectional area of this lead increases, the above-mentioned problem becomes more prominent.For this reason, in the past, it is lightweight, thin and flexible, and is used in many applications for devices and equipment. Although expected to contribute to miniaturization and weight reduction of automobiles and the like, when the battery capacity is 3 Ah or more, it has been difficult to form a sheet-like lithium ion battery using a bag-like outer package.
[0009]
[Problems to be solved by the invention]
Therefore, the present inventors have obtained a lightweight, thin and flexible sheet-like secondary battery using such a three-layer laminated film bag-like outer package, and can be reduced in size and weight. As a result of intensive studies on the electrode lead-out structure that can constitute a secondary battery having a relatively large capacity, preferably 5 Ah or more, without impairing the feature that it is possible, an internal electrode pair is formed inside the bag-shaped outer package. Between the pair of internal leads individually connecting the positive electrode and the negative electrode and the pair of external leads arranged outside the bag-like outer package, and one end side of the bag passes through the bag-shaped outer package. The other end side is connected to each internal lead on the inner side of the outer bag and connected to each outer lead on the outer side of the bag-like outer bag by a pair of connecting means. Electrical connection between external leads More found that can hold firmly and airtight bag-like outer packaging member between each internal lead and the external leads, thereby completing the present invention.
[0010]
Accordingly, an object of the present invention is a sheet-like secondary battery using a bag-like outer package as a battery case, which is lightweight, thin and flexible, can be reduced in size and weight, and is relatively large. An object of the present invention is to provide an electrode lead-out structure of a sheet-like secondary battery that can also achieve a secondary battery having a capacity.
[0011]
[Means for Solving the Problems]
That is, the present invention provides a multilayer sheet-like internal electrode pair formed by alternately laminating a plurality of sheet-like positive electrodes and a plurality of sheet-like negative electrodes via separators, and the internal electrode pair and the electrolysis A flexible bag-like outer package containing a liquid in a sealed state and having an inner surface layer made of thermoplastic resin, an intermediate layer made of metal foil, and an outer surface layer made of insulating resin , and the bag-shaped outer package A pair of plate-like internal leads that consolidate and connect the ends of each positive electrode and each negative electrode of the internal electrode pair, and a bag corresponding to each internal lead with the bag-like outer package sandwiched therebetween A pair of plate-like external leads having the same thickness as the internal leads, and one end side inside the bag-shaped outer package, hermetically passing through the bag-shaped outer package. Each external lead connected to each internal lead located and having the other end located outside the bag-like outer package Is connected to the lead is an electrode lead structure of the sheet-like secondary battery characterized by being composed with the respective inner leads and the outer leads and a pair of connecting means for electrically connecting under pressure.
[0012]
In the present invention, a flexible bag-like outer package that accommodates a sheet-like internal electrode pair formed by alternately laminating a sheet-like positive electrode and a sheet-like negative electrode and an electrolyte solution therein The body is not particularly limited as long as it has a strength that can be used as a battery case of a sheet-like secondary battery and has an excellent electrolytic solution resistance with respect to the electrolyte contained therein. For example, an inner surface layer made of a thermoplastic resin excellent in electrolytic solution resistance and heat sealability such as polyethylene, polypropylene, polystyrene, polyamide, and ionomer is provided on the inner surface side, and a flexible material such as aluminum foil or SUS foil is provided in the middle. An intermediate layer made of a metal foil having excellent properties and strength, and a three-layer structure having an outer surface layer made of an insulating resin excellent in electrical insulation such as a polyamide resin and a polyester resin on the outer surface side. Bag-like outer packaging of a flexible formed using a titanate film (see Re. No. Table 98 / 042,036) can be exemplified.
[0013]
In the present invention, inside the bag-like outer package, each positive electrode of the internal electrode pair is connected by an internal lead on the positive electrode side, and each negative electrode is connected by an internal lead on the negative electrode side. External positive leads and negative external leads are disposed outside the outer envelope at positions corresponding to the positive and negative internal leads, respectively. The positive internal lead and the positive external lead And a negative electrode side internal lead and a negative electrode side external lead are electrically connected by a pair of connection means penetrating the bag-like outer package in an airtight manner.
[0014]
Here, the shape of the internal lead and the external lead can be appropriately designed according to the battery capacity, volume, weight, usage, etc. of the sheet-like secondary battery to be formed. Compared to those conventionally used in the secondary battery, it is preferable that the secondary battery is formed in a strip shape that is relatively thick, for example, about 0.5 mm or more, preferably 1 to 5 mm. As for the material, a metal such as aluminum, aluminum alloy, copper, nickel, etc. is used as in the lead material and shape conventionally used in this type of secondary battery. For the lead and the external lead, it is preferable to use the same material as that for forming the positive electrode current collector, for example, aluminum or an aluminum alloy. For the internal lead and the external lead on the negative electrode side, the negative electrode current collector is formed. It is preferable to use the same material as the material, for example, copper and / or nickel.
[0015]
In the present invention, the connecting means for connecting the internal leads and the external leads is capable of reliably connecting and electrically connecting the internal leads and the external leads. For example, solid rivets (hereinafter simply referred to as “rivets”), full tubular rivets, semi-tubular rivets, split rivets, compression rivets, blind rivets and other rivets, and internal and external leads A stud is erected in a fixed or fixed manner and a through hole is formed on the other side of the stud, and the stud is inserted into the through hole and the tip is caulked to fix it, bolts and nuts, etc. The means can be exemplified.
[0016]
As for the material of the rivet and the like constituting this connecting means, preferably, the one that connects the positive side internal lead and the external lead is made of aluminum or aluminum alloy of the same material as the internal lead, and For the connection between the internal lead on the negative electrode side and the external lead, it is preferable to use copper and / or nickel of the same material as the internal lead. As described above, the same material as that for forming the positive electrode current collector, for example, aluminum or aluminum alloy is used as the material for the positive side internal lead, external lead and connection means, and the negative side internal lead, external lead and connection are used. By using the same material as the material for forming the positive electrode current collector as the material of the means, for example, copper and / or nickel, it is possible to reduce the contact resistance and to prevent thermal deformation due to the difference in thermal expansion coefficient. is there.
[0017]
Furthermore, in the present invention, the through-hole of the bag-like outer package through which the connecting means for connecting between each internal lead and each external lead passes needs to be completely hermetically sealed. The method for hermetically sealing the through-hole of the bag-like outer package is not particularly limited. For example, between the inner lead and the bag-shaped outer package and / or between the outer lead and the bag-shaped outer package, A sealing member for sealing the through-hole of the bag-like outer casing through which the connecting means passes may be interposed, and in the laminate film forming the bag-like outer casing, the peripheral portion of the through-hole through which the connecting means passes The thickness of the inner layer and / or outer layer in the layer is formed thicker than other general surfaces in advance, and the periphery of the through-hole formed thick when the connecting means is fastened between the internal lead and the external lead You may make it seal a through-hole with a part.
[0018]
And when using the said sealing member, at least about the sealing member interposed between an internal lead and a bag-like outer package, it is necessary to be formed of a synthetic resin excellent in electrolytic solution resistance, preferably It is good to form with thermoplastic resins, such as a polypropylene or polyethylene, similarly to the inner surface layer of the laminate film which forms a bag-like outer package.
[0019]
In the electrode lead-out structure of the sheet-like secondary battery of the present invention, the position on the bag-like outer package where the external lead is disposed is not particularly limited as long as it can be attached in relation to the internal lead.
[0020]
There is no particular limitation on the method of manufacturing the secondary battery having the electrode lead structure according to the present invention. For example, when manufacturing a sheet-shaped secondary battery having a substantially rectangular plane using a rivet as a connecting means, the following method is used. It can be manufactured easily by simple procedures.
(1) First, the internal leads on the positive electrode side and the negative electrode side are respectively connected to predetermined positions of the internal electrode pair.
(2) Next, the internal electrode pair provided with the internal leads is accommodated in the bag-shaped outer package whose three sides are heat-sealed.
(3) Outside leads are arranged on the outside of the bag-like outer package at positions corresponding to the inner leads, and each rivet hole provided in the inner lead and the outer lead, and a through hole provided in the bag-like outer package, Match.
(4) A rivet is inserted into each rivet hole and through hole, and a force is applied to the rivet shaft through which the rivet projects through the rivet hole of the internal lead or the external lead by means of striking, hydraulic, air pressure, etc. The tip of the rivet shaft protruding through the rivet hole is caulked.
(5) Heat seal the remaining one side of the bag-like outer package to seal the whole.
(6) For example, a corner portion of the bag-like outer package is cut out to form a relatively small opening.
(7) The inside of the bag-like outer package is filled with the electrolytic solution from the opening, and the opening is heat-sealed and sealed.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail based on examples and test examples shown in the accompanying drawings.
[0022]
〔Example〕
1 to 3 are explanatory diagrams of a sheet-like lithium ion secondary battery to which the electrode lead structure of the present invention is applied. Here, FIG. 2 and FIG. 3 show the cross section of the positive electrode lead side, and the negative electrode lead side is structurally the same as this positive electrode lead side, so the following description will focus on this positive electrode lead side. To do.
[0023]
The sheet-like secondary battery B of this embodiment is a sheet-like internal electrode pair formed by alternately laminating a plurality of sheet-like positive electrodes 1a and a plurality of sheet-like negative electrodes 1b via separators 1c. 1, a flexible bag-like outer package 2 that accommodates the internal electrode pair 1 and an electrolyte solution (not shown) inside in a sealed state, and each of the internal electrode pairs 1 within the bag-like outer package 2. A positive-side internal lead 5a connecting the positive electrode 1a, a negative-side internal lead (5b, not shown) connecting each negative electrode 1b of the internal electrode pair 1, and the bag-like outer package 2 are sandwiched between Corresponding to the positive lead-side external lead 6a disposed outside the bag-like outer package 2 corresponding to the positive electrode-side inner lead 5a and the negative-electrode-side inner lead sandwiching the bag-shaped outer package 2 An external lead 6b on the negative electrode side disposed outside the bag-shaped outer package 2 and one end penetrating air through the bag-shaped outer package 2 Are connected to the internal leads 5a and 5b positioned inside the bag-shaped outer package 2, and the other end is connected to the external leads 6a and 6b positioned outside the bag-shaped outer package 2, respectively. The inner leads 5a, 5b and the outer leads 6a, 6b are composed of a pair of two rivets 7a, 7b (four in total) that electrically connect the leads 6a, 6b.
[0024]
In this embodiment, a bag-like envelope through which rivets 7a and 7b penetrate between the inner leads 5a and 5b and the bag-like outer package 2 and between the outer leads 6a and 6b and the bag-like outer package 2 is shown. Seal members 8a and 8b for sealing the two through holes are interposed.
Reference numeral 4 denotes a heat seal portion of the bag-like outer package 2.
[0025]
Here, in the internal electrode pair 1, as shown in FIG. 4, each positive electrode 1a is formed by laminating a positive electrode active material 10 on both surfaces of a positive electrode current collector 9 made of aluminum, and each negative electrode 1a An electrode 1b is formed by laminating a negative electrode active material 12 on both surfaces of a negative electrode current collector 11 made of copper. Also, the positive electrode side internal lead 5a, the positive electrode side external lead 6a, and the rivet 7a connecting them are all made of the same aluminum as the positive electrode current collector 9, and the negative electrode side internal lead 5a. The negative lead 5b, the external lead 6b on the negative electrode side, and the rivet 7b connecting them are made of the same copper as the negative electrode current collector 11.
[0026]
Further, in this embodiment, the bag-like outer package 2 has an inner surface layer 2a made of polyethylene on the inner surface side, an intermediate layer 2b made of aluminum foil in the middle, and an outer surface layer 2c made of nylon on the outer surface side. The sealing member 8a is formed of a laminate film having a three-layer structure, and is interposed between the internal leads 5a and 5b and the bag-shaped outer package 2, and is the same as the inner surface layer 2a of the bag-shaped outer package 2. The sealing member 8b made of polyethylene and interposed between the external leads 6a and 6b and the bag-like outer package 2 is made of the same nylon as the outer surface layer 2c of the bag-like outer package 2.
[0027]
In the sheet-like lithium ion secondary battery B of this embodiment, when the rivets 7a and 7b are used to rivet between the internal leads 5a and 5b and the external leads 6a and 6b, the internal leads 5a and 5b The outer bag 2 and the sealing members 8a and 8b are sandwiched between the external leads 6a and 6b under pressure, whereby the through-holes of the outer bag 2 through which the rivets 7a and 7b pass are hermetically sealed. At the same time, the internal leads 5a and 5b and the external leads 6a and 6b are electrically connected by the rivets 7a and 7b.
[0028]
[Test example]
120 mm x 300 mm x 5 mm internal electrode pairs, 15 mm x 100 mm x 1.5 mm aluminum or copper internal leads, 15 mm x 100 mm x 1.5 mm aluminum or copper external leads 4mmφ × 6mm aluminum or copper rivets are used, the inner layer is a polyethylene layer with a thickness of 0.08mm, the intermediate layer is an aluminum foil with a thickness of 0.04mm, and the outer layer is thick. Using a bag-like outer package which is a nylon layer of 0.03 mm, and further using a mixed electrolyte of ethylene carbonate (EC) and diethyl carbonate (DEC) as the electrolyte, and having the same shape as the above example 100 sheet-like lithium ion batteries having a battery capacity of 10 Ah and a voltage of 4.2 V were prepared, stored at 80 ° C. under storage conditions for 1 week, and the number of electrolyte leaks and the voltage after storage were examined.
As a result, the number of occurrences of electrolyte leakage was 0, and the voltage after storage was in the range of 4.12 to 4.18V.
[0029]
[Comparative test example]
For comparison, the battery capacity of 10 Ah was the same as in the above test example except that the tip of the internal lead protruded outside from the heat seal portion of the bag-like outer package, and the external protrusion was used as the external lead. In addition, 100 sheet-like lithium ion batteries having a voltage of 4.2 V were produced and stored at 80 ° C. under storage conditions for one week, and the number of electrolyte leaks and the voltage after storage were examined.
As a result, the number of occurrences of electrolyte leakage was 45, and the voltage after storage was in the range of 0 to 4.0V.
[0030]
As is clear from the above test example and comparative test example, the sheet-like lithium ion secondary battery of the comparative test example having the conventional structure has a large self-discharge, and nearly half of the lithium ion secondary battery caused the electrolyte leakage. In the sheet-like lithium ion secondary battery of the test example having the structure of the present invention, self-discharge was as small as about 0.05 V on average, and no electrolyte leakage was observed.
[0031]
【The invention's effect】
According to the electrode lead-out structure of the sheet-like secondary battery of the present invention, the sheet-like secondary battery using a bag-like outer package as a battery case is lightweight, thin and flexible, and can be reduced in size and weight. In addition, it is possible to achieve a secondary battery having a relatively large capacity, and is particularly suitable as an electrode lead structure for a sheet-like lithium ion secondary battery having a relatively large capacity.
[Brief description of the drawings]
FIG. 1 is a perspective explanatory view of a sheet-like lithium ion secondary battery to which an electrode lead structure according to an embodiment of the present invention is applied.
FIG. 2 is a sectional view taken along line II-II in FIG.
FIG. 3 is a sectional view taken along line III-III in FIG.
4 is an explanatory view showing an internal electrode pair housed in the bag-like outer package of FIG. 1. FIG.
FIG. 5 is a perspective explanatory view of a sheet-like lithium ion secondary battery to which a conventional electrode lead structure is applied.
FIG. 6 is a cross-sectional explanatory view taken along the line VI-VI in FIG. 5;
[Explanation of symbols]
B ... sheet-like lithium ion secondary battery, 1 ... internal electrode pair, 1a ... positive electrode, 1b ... negative electrode, 1c ... separator, 2 ... bag-like envelope, 4 ... heat seal part, 5a, 5b ... internal lead, 6a, 6b ... external leads, 7a, 7b ... rivets, 8a, 8b ... sealing members, 9 ... positive electrode current collector, 10 ... positive electrode active material, 11 ... negative electrode current collector, 12 ... negative electrode active material.

Claims (9)

  1. A multilayer sheet-like internal electrode pair formed by alternately laminating a plurality of sheet-like positive electrodes and a plurality of sheet-like negative electrodes via separators;
    A flexible bag-like outer package containing the internal electrode pair and the electrolyte solution in a sealed state, and having an inner surface layer made of thermoplastic resin, an intermediate layer made of metal foil, and an outer surface layer made of insulating resin ; ,
    A pair of plate-like internal leads that consolidate and connect the ends of each positive electrode and each negative electrode of the internal electrode pair inside the bag-like outer package,
    A pair of plate-like external leads having a thickness equivalent to that of the internal leads , disposed on the outside of the bag-like external body corresponding to the internal leads with the bag-shaped external body sandwiched therebetween,
    Airtightly penetrates the bag-like outer package, one end is connected to each internal lead located inside the bag-like outer package and the other end is connected to each external lead located outside the bag-like outer package, An electrode lead-out structure for a sheet-like secondary battery, comprising a pair of connecting means for electrically connecting each internal lead and each external lead under pressure .
  2.   A seal member for sealing a through hole of the bag-like outer package through which the connecting means passes is interposed between the inner lead and the bag-like outer package and / or between the outer lead and the bag-like outer package. The electrode extraction structure of the sheet-like secondary battery according to claim 1.
  3.   The electrode lead-out structure of the sheet-like secondary battery according to claim 1 or 2, wherein the internal lead and the external lead connected by the connecting means are formed of the same material.
  4.   The electrode lead-out structure of the sheet-like secondary battery according to any one of claims 1 to 3, wherein the connecting means is formed of at least the same material as the internal lead.
  5.   The electrode lead-out structure for a sheet-like secondary battery according to any one of claims 1 to 4, wherein the connecting means is a rivet coupled to the corresponding internal lead and external lead.
  6.   6. The sheet-like two according to claim 2, wherein at least the seal member interposed between the internal lead and the bag-like outer package is formed of a synthetic resin having excellent chemical resistance. Secondary battery electrode lead-out structure.
  7.   The electrode lead-out structure of the sheet-like secondary battery according to claim 6, wherein at least the seal member interposed between the internal lead and the bag-like outer package is formed of polypropylene, polyethylene, or ionomer.
  8.   The pair of external leads is the electrode lead-out structure of the sheet-like secondary battery according to any one of claims 1 to 7, which is located on the same surface side of the bag-like outer package.
  9.   The electrode lead-out structure of the sheet-like secondary battery according to any one of claims 1 to 8, wherein the sheet-like secondary battery is a large-capacity lithium ion secondary battery of 5 Ah or more.
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US9859536B2 (en) 2013-12-26 2018-01-02 Kabushiki Kaisha Toshiba Nonaqueous electrolyte battery including a sealed case, battery pack and storage battery apparatus

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