JP4565530B2 - Flat non-aqueous electrolyte secondary battery - Google Patents

Flat non-aqueous electrolyte secondary battery Download PDF

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JP4565530B2
JP4565530B2 JP2000183001A JP2000183001A JP4565530B2 JP 4565530 B2 JP4565530 B2 JP 4565530B2 JP 2000183001 A JP2000183001 A JP 2000183001A JP 2000183001 A JP2000183001 A JP 2000183001A JP 4565530 B2 JP4565530 B2 JP 4565530B2
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negative electrode
positive electrode
flat
mm
electrolyte secondary
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JP2002008727A (en
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和男 宇田川
宗人 早見
正美 鈴木
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日立マクセル株式会社
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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
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation
    • Y02E60/122Lithium-ion batteries

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat non-aqueous electrolyte secondary battery, and more particularly to a flat non-aqueous electrolyte secondary battery that prevents damage to a separator and electrodes during lead terminal welding.
[0002]
[Prior art]
Metal oxides such as MnO 2 and V 2 O 5 , inorganic compounds such as fluorinated graphite, or organic compounds such as polyaniline and polyacene structures are used as the positive electrode active substance, and metal lithium, lithium alloy, and polyacene structures are used as the negative electrode Organic compounds such as lithium, carbonaceous materials that can occlude and release lithium, or oxides such as lithium titanate and lithium-containing silicon oxide, and the electrolyte is propylene carbonate, ethylene carbonate, butylene carbonate, diethyl carbonate, dimethyl carbonate LiClO 4 , LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN (CF 3 SO 2 ) 2 , LiN (C 2 F 5 SO 2 ) 2 in a non-aqueous solvent such as methyl ethyl carbonate, dimethoxyethane, and γ-butyrolactone. Using a non-aqueous electrolyte in which a supporting salt such as Coin-shaped and button-shaped flat non-aqueous electrolyte secondary batteries have already been commercialized and do not require a backup power source or battery replacement for SRAM or RTC that discharges with a light load with a discharge current of several to several tens of μA. It is applied to uses such as the main power source of watches.
[0003]
On the other hand, as main power sources for small information terminals such as mobile phones and PDAs, larger rectangular and cylindrical lithium ion secondary batteries and nickel hydride storage batteries are used. However, in recent years, downsizing of devices used has been accelerated, and it is required to reduce the size of the secondary battery as the main power source. On the other hand, a metal negative electrode case also serving as a negative electrode terminal and a metal positive electrode case also serving as a positive electrode terminal as shown in Japanese Patent Application No. 11-240964 and Japanese Patent Application No. 11-241290 are fitted through an insulating gasket. A flat non-aqueous solution that has a sealing structure in which the positive electrode case or the negative electrode case is further crimped by caulking, and includes a power generation element including at least a positive electrode, a separator, and a negative electrode, and a non-aqueous electrolyte. In an electrolyte secondary battery, when a cross section in a direction perpendicular to the flat surface of a flat battery is viewed, an electrode group having positive and negative electrode facing surfaces in which at least three positive and negative electrodes face each other with a separator interposed therebetween. There has been proposed a flat nonaqueous electrolyte secondary battery that is housed and has a total sum of positive and negative electrode facing areas in an electrode group larger than an opening area of an insulating gasket.
[0004]
Next, when incorporating these flat non-aqueous electrolyte secondary batteries into equipment, the lead terminals are welded to the outside of the positive electrode case and / or the negative electrode case in the same manner as conventional flat batteries, and the lead terminal ends are connected to the inside of the equipment. A method of soldering and incorporating the circuit board is considered. However, in the battery, since it is necessary to store an electrode group having a large electrode area in the battery in a compact manner, the thickness of the electrode layer including the positive electrode active substance-containing layer, the negative electrode active substance-containing layer, and the separator is approximately 1.0 mm. A current collecting mechanism is adopted that suppresses the following, further stacks or winds, and makes the upper and lower surfaces of the electrode group contact the positive electrode case and the negative electrode case. Therefore, there is no problem as long as the electrode layer is thick. However, in a battery configuration having an electrode layer thickness of 1.0 mm or less, the heat generated when welding the lead terminal to the case outer surface of the flat battery is reduced. It is easy to be transferred to the inside of the electrode group through the battery case and the electrode group current collector, and as a result, the generated heat reaches the separator, causing the separator to perforate and shrink, leading to an internal short circuit and capacity deterioration. It was. In addition, there is a problem that the electrode leading to the welded part is peeled off from the current collector, which is considered to be a cause of the capacity reduction.
[0005]
[Problems to be solved by the invention]
The present inventors have been made in view of the above situation, and the purpose thereof is to block the transfer of heat generated when welding the lead terminal to the battery case to the inside of the electrode group, thereby causing the capacity deterioration and internal short circuit. An object of the present invention is to provide a flat non-aqueous electrolyte secondary battery to prevent.
[0006]
[Means for Solving the Problems]
As a result of intensive studies, the present inventors have found that in a flat non-aqueous electrolyte secondary battery, a non-metallic heat insulating material is provided between the positive electrode and / or the negative electrode case and the thin film separator, whereby the positive electrode and the negative electrode case are provided. It has been found that the heat generated when welding the lead terminal from the outside of the battery can be blocked from being transmitted to the inside of the electrode group, and the destruction of the electrode and separator in the battery can be suppressed. In addition, with regard to the method of installing the heat insulating material, the current collecting part of the electrode group in contact with the battery case is processed into a U shape, and the heat insulating material is held inside the U shape so that the structure is not complicated and the productivity is excellent. It was found that the electrode and the thin film separator in the battery can be prevented from being destroyed while maintaining the above, and because the battery is compact, a high capacity can be obtained.
[0007]
Hereinafter, how the present inventors have realized the flat nonaqueous electrolyte secondary battery (hereinafter simply referred to as a battery) of the present invention will be described.
In order to prevent the heat generated during lead terminal welding from being transmitted to the inside of the electrode, a non-metallic material is inserted between the battery case and the electrode group. However, nonmetallic materials with low thermal conductivity are generally poor in electrical conductivity.
[0008]
Therefore, it is possible to energize the electrode group and the positive electrode case or the negative electrode case by making the current collecting part of the electrode group long and forming a U shape, and inserting a heat insulating material therein, and only performing heat insulation It becomes possible. Nonmetallic materials with low thermal conductivity include glassy materials, polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and tetrafluoroethylene-ethylene copolymer (ETFE). , Fluoropolymers such as tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) and polyvinylidene fluoride (PVDF), polyimide, liquid crystal polymer (LCP), polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyethylene terephthalate A resin selected from (PET), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and acetate resin is preferably stable with respect to the electrolyte and lithium ions, and heat generated during terminal welding. Therefore, in order to prevent the heat insulating material from melting and affecting the battery performance, a heat insulating material having a heat resistance of 150 ° C. or higher is more preferable. A glassy material and a fluororesin such as PTFE, FEP, ETFE, PFA, PVDF, polyimide, etc. A resin selected from LCP, PPS and PBT is more preferable.
[0009]
Moreover, about the form, flexible materials, such as a film, a woven fabric, a nonwoven fabric, and a fiber, have good adhesiveness with an electrode current collection member, and a heat insulation effect is high and preferable. Further, a tape-like material made of these materials as a base material and coated with an adhesive on one side or both sides is excellent in preventing displacement of the electrode current collecting member and the heat insulating material, and is more effective. Further, the shape of the heat insulating material is not particularly limited, but it is more preferable to make the area larger than the area of the current collecting portion of the electrode group for the purpose of giving flexibility to the position and direction of the terminal during terminal welding.
[0010]
Regarding the thickness of the heat insulating material, if the thickness is small, the heat insulating effect is insufficient, and if it is thick, the amount of active substance that can be incorporated in the battery decreases, leading to a decrease in battery capacity. Considering these, the thickness of the heat insulating material is suitably 0.05 mm or more and 0.20 mm or less.
[0011]
Next, the present battery is based on the structure of the battery including the electrode, and the positive electrode active material is not limited. MnO 2 , V 2 O 5 , Nb 2 O 5 , LiTi 2 Metal oxides such as O 4 , Li 4 Ti 5 O 12 , LiFe 2 O 4 , lithium cobaltate, lithium nickelate and lithium manganate, inorganic compounds such as graphite fluoride and FeS 2 , or polyaniline and polyacene structures Any organic compounds such as can be applied. However, lithium-containing oxides in which lithium cobaltate, lithium nickelate, lithium manganate, mixtures thereof, or some of these elements are substituted with other metal elements are high in terms of operating potential and excellent cycle characteristics. Lithium cobaltate is a flat type non-aqueous electrolyte secondary battery that is more preferable and may be used for a long period of time because it has a high capacity, is low in reactivity with electrolytes and moisture, and is chemically stable. Is more preferable.
[0012]
Next, the negative electrode active material of the battery is not limited, and is lithium metal, Li-Al, Li-In, Li-Sn, Li-Si, Li-Ge, Li-Bi, Li-Pb, or the like. Lithium alloys, organic compounds such as polyacene structures, carbonaceous materials capable of occluding and releasing lithium, or Nb 2 O 5 , LiTi 2 O 4 , Li 4 Ti 5 O 12 and Li-containing silicon oxides All kinds of oxides can be used, but carbonaceous materials that can occlude and release Li are preferable in terms of excellent cycle characteristics, low operating potential, and high capacity. natural graphite and artificial graphite in that the voltage drop is small, expanded graphite, mesophase pitch fired body, the spacing of d 002 plane such as mesophase pitch fibers fired 0.3 A carbonaceous material with a developed graphite structure of 38 nm or less is more preferable.
[0013]
As for the electrodes, both the positive and negative electrodes may be formed by pressure forming a granular mixture as found in conventional flat batteries or by filling the metal net with a mixture. From the standpoint of ease, a slurry obtained by applying a slurry mixture to a metal foil and drying it is preferable, and a rolled product thereof can also be used. When using an electrode in which a mixture layer containing an active substance is applied to the metal foil as described above, the electrode used inside the electrode group is one in which an active substance-containing layer is formed on both sides of the metal foil. From the viewpoint of efficiency, the metal negative electrode case that also serves as the negative electrode terminal, and both ends of the electrode component material that contacts the metal positive electrode case that also serves as the positive electrode terminal, in order to reduce contact resistance, It is particularly preferable to expose the metal foil. In this regard, an electrode in which an active substance-containing layer is formed only on one side may be used only in this portion, or after an active substance-containing layer is once formed on both sides, the active substance-containing layer may be removed only on one side.
[0014]
Moreover, the material of the lead terminal welded to the battery is not particularly limited as long as conductivity is obtained, and a stainless material is preferable in terms of excellent terminal strength and workability. Further, the thickness and shape of the terminal are not particularly limited.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, examples and comparative examples of the present invention will be described in detail.
Example 1
1 is a cross-sectional view of a flat nonaqueous electrolyte secondary battery according to Example 1 of the present invention, and FIG. 2 is a partially enlarged view of FIG.
In the figure, the battery case of the flat non-aqueous electrolyte secondary battery of Example 1 has a negative electrode case 7 in which an insulating gasket 6 is integrated with a positive electrode case 8 made of stainless steel. Contains a power generating element wound in a spiral shape between a positive electrode active substance-containing layer 1a and a negative electrode active substance-containing layer 3a with a separator 5 made of a polyethylene microporous film interposed therebetween. 1b is a positive electrode current collector, 2 is a heat insulating material on the positive electrode side, 3 is a negative electrode plate, 3b is a negative electrode current collector, and 4 is a heat insulating material on the negative electrode side.
[0016]
Next, a method for manufacturing the flat nonaqueous electrolyte secondary battery of Example 1 will be described.
First, 5 parts by mass of acetylene black and 5 parts by mass of graphite powder are added as conductive materials to 100 parts by mass of LiCoO 2 , 5 parts by mass of polyvinylidene fluoride (PVDF) is added as a binder, and diluted and mixed with N-methylpyrrolidone. As a result, a slurry-like positive electrode mixture was obtained. This positive electrode mixture was applied to one side of a 0.02 mm thick aluminum foil as the positive electrode current collector 1b by a doctor blade method and dried to form the positive electrode active substance-containing layer 1a on the aluminum foil surface. Thereafter, the other side was coated and dried in the same manner to produce a double-sided coated positive electrode having a positive electrode active material-containing layer la having a coating thickness of 0.15 mm on both sides. Next, this double-side coated positive electrode was cut out to a width of 15 mm and a length of 120 mm, the portion from the end of one side of the electrode to 10 mm was used as the current-carrying part, the positive-electrode active substance-containing layer 1a was removed, and the positive-electrode active substance contained on the back side The layer 1a was removed from the end to an area of 22 mm to obtain a positive electrode plate 1. As the heat insulating material 2, a glass cloth having a length of 11 mm and a width of 16 mm is used as a base material, and a glass tape having a thickness of 0.03 mm coated with an adhesive is applied to the positive electrode active material containing layer 1 a from the end of the positive electrode plate. It was affixed at a position 10 mm from the end of the surface that was removed up to an area of 22 mm from the end.
[0017]
Next, 2.5 parts by mass of styrene butadiene rubber (SBR) and carboxymethyl cellulose (CMC) are added as binders to 100 parts by mass of graphitized mesophase pitch carbon fiber powder, respectively, diluted with ion-exchanged water, mixed, A slurry-like negative electrode mixture was obtained. The obtained negative electrode mixture was applied to a 0.02 mm thick copper foil, which is the negative electrode current collector 3b, so that the thickness of the negative electrode active material-containing layer 3a was 0.15 mm, and dried in the same manner as in the case of the positive electrode. And a double-sided coated negative electrode body was produced. Next, this negative electrode body is cut out to have a width of 15 mm and a length of 120 mm, and the portion from the end of one side of the electrode to 10 mm is used as a current-carrying part, the negative electrode active substance-containing layer 3a is removed, and the negative electrode active substance-containing layer 3a on the back side. Was removed to an area of 22 mm from the end to form a negative electrode plate 3. A glass cloth having a length of 11 mm and a width of 16 mm is used as a base material at a position 10 mm from the end of the surface obtained by removing the negative electrode active material-containing layer 3 a from the end of the negative electrode plate 3 to an area of 22 mm from the end. A glass tape having a thickness of 0.03 mm with an adhesive applied on one side was attached.
[0018]
Next, the positive and negative electrode energizing portions were finished, and the positive electrode 1 and the negative electrode 3 were wound between the positive electrode plate 1 and the negative electrode plate 3 with a separator 5 made of a polyethylene microporous film having a thickness of 25 μm. A space in the center of the wound electrode in a certain direction so that the uncoated portions of the positive electrode plate and the negative electrode plate are bent in opposite directions in the winding direction and have a positive and negative electrode facing portion in the horizontal direction with respect to the flat surface of the flat battery. Pressurized until no more.
[0019]
After the produced electrode group was dried at 85 ° C. for 12 hours, the uncoated portion on the negative electrode side of the electrode group was in contact with the inner bottom surface of the negative electrode case 7 having a thickness of 0.25 mm integrated with the insulating gasket 6. Then, a non-aqueous electrolyte in which LiPF 6 was dissolved as a supporting salt in a ratio of 1 mol / l was poured into a solvent in which ethylene carbonate and methyl ethyl carbonate were mixed at a volume ratio of 1: 1, and the positive electrode was not coated. The positive electrode case 8 having a thickness of 0.25 mm is fitted so as to be in contact with the upper surface, and after being turned upside down, the positive electrode case 8 is crimped, sealed, and flattened as in Example 1 having a thickness of 3 mm and a diameter of 24.5 mm. A nonaqueous electrolyte secondary battery was fabricated.
[0020]
(Example 2)
A battery was fabricated in the same manner as in Example 1, except that a glass tape having a thickness of 0.05 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0021]
(Example 3)
A battery was fabricated in the same manner as in Example 1 except that the active substance containing layer of the positive electrode and the negative electrode had a thickness of 0.14 mm, and a glass tape having a thickness of 0.10 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0022]
Example 4
A battery was prepared in the same manner as in Example 1 except that the active substance containing layer of the positive electrode and the negative electrode had a thickness of 0.13 mm, and a glass tape having a thickness of 0.15 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0023]
(Example 5)
A battery was fabricated in the same manner as in Example 1 except that the active substance-containing layer of the positive electrode and the negative electrode had a thickness of 0.12 mm, and a glass tape having a thickness of 0.20 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0024]
(Example 6)
A battery was fabricated in the same manner as in Example 1 except that the active substance containing layer of the positive electrode and the negative electrode had a thickness of 0.10 mm and a glass tape having a thickness of 0.30 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0025]
(Example 7)
A battery was fabricated in the same manner as in Example 1, except that a PTFE film having a base material and a PTFE tape having a thickness of 0.03 mm coated with an adhesive on one side was attached as a heat insulating material to the positive electrode plate and the negative electrode plate.
[0026]
(Example 8)
A battery was produced in the same manner as in Example 1 except that a PTFE tape having a thickness of 0.05 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0027]
Example 9
A battery was fabricated in the same manner as in Example 1 except that the active substance containing layer of the positive electrode and the negative electrode had a thickness of 0.14 mm, and a PTFE tape having a thickness of 0.10 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0028]
(Example 10)
A battery was prepared in the same manner as in Example 1 except that the active substance containing layer of the positive electrode and the negative electrode had a thickness of 0.13 mm and a PTFE tape having a thickness of 0.15 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0029]
(Example 11)
A battery was fabricated in the same manner as in Example 1 except that the active substance containing layer of the positive electrode and the negative electrode had a thickness of 0.12 mm, and a PTFE tape having a thickness of 0.20 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0030]
(Example 12)
A battery was fabricated in the same manner as in Example 1 except that the active substance-containing layer of the positive electrode and the negative electrode had a thickness of 0.10 mm, and a PTFE tape having a thickness of 0.30 mm was attached to the positive electrode plate and the negative electrode plate as a heat insulating material.
[0031]
(Comparative Example 1)
A battery was produced in the same manner as in Example 1 except that the heat insulating material was not attached to the positive electrode plate and the negative electrode plate.
[0032]
For each of the 300 batteries of this example and the comparative example produced as described above, a lead terminal made of stainless steel with a thickness of 0.2 mm was further added to both the positive and negative battery cases, and the output voltage of the resistance welding machine was set to 480 ± 10 V. Set and welded. Fifty of these batteries were extracted at random, the batteries were disassembled, and the positive and negative separators were perforated, contracted, and the electrodes were peeled off. Next, 50 batteries were further extracted from the remaining batteries, and the initial charge was carried out at a constant current and a constant voltage of 4.2 V and 3 mA for 48 hours. After leaving at room temperature for 3 days, the open circuit voltage was measured. Thereafter, only the batteries having the open circuit voltage of 4.0 V or higher were selected, and further discharged to 3.0 V at a constant current of 1 mA to obtain the discharge capacity.
[0033]
The separator of the battery of this example and the comparative example, perforation, shrinkage, electrode peeling rate, the number of batteries whose open circuit voltage after standing for 3 days was 4.0 V or more, and the average of the discharge capacity thereafter The values are shown in Table 1.
[0034]
[Table 1]
[0035]
As is apparent from Table 1, the batteries of the respective examples of the present invention were made by punching, shrinking, and peeling off the electrodes on the positive and negative electrode sides after resistance welding of the lead terminals to the battery as compared with the battery of Comparative Example 1. Is greatly improved, the internal short circuit of the battery is suppressed, and the rate of occurrence of the battery in which the open circuit voltage is reduced is reduced. Regarding the batteries of Examples 1 and 7, there was some shrinkage of the positive electrode and negative electrode side separators after resistance welding, but the internal short circuit within the battery did not occur. In particular, regarding the batteries of Examples 2 to 6 and Examples 8 to 12 in which the thickness of the glass tape that is a heat insulating material or the PTFE tape that is a fluororesin is 0.05 mm or more, after resistance welding the lead terminal to the battery The separators on the positive and negative electrode sides are hardly perforated, contracted, peeled off from the electrodes, and the open circuit voltage is hardly lowered. Furthermore, since the batteries of Examples 2 to 5 and Examples 8 to 11 have an appropriate thickness of the heat insulating material, many active substances can be packed in the battery, and a high capacity battery can be obtained.
[0036]
In the examples of the present invention, the case where glass and PTFE are used as the base material of the non-metallic heat insulating material has been described. However, the base material is FEP, ETFE, PFA, PVDF, polyimide, LCP, PPS, PBT. The same effect can be obtained when using. In the embodiments of the present invention, a flat nonaqueous solvent secondary battery using a nonaqueous solvent as a nonaqueous electrolyte has been described. However, the present invention is a polymer secondary battery using a polymer electrolyte as a nonaqueous electrolyte. It can also be applied to solid electrolyte secondary batteries using solid electrolytes, and it is also effective for batteries using polymer thin films and solid electrolyte films that may be damaged by heat when welding instead of resin separators. It is. The battery shape has been described based on a coin-type non-aqueous electrolyte secondary battery that is sealed by crimping the positive electrode case, but it is also possible to replace the positive and negative electrodes and seal the negative electrode case by crimping. . Further, the battery shape does not have to be a perfect circle, and can be applied to a flat nonaqueous electrolyte secondary battery having a special shape such as an oval shape or a square shape.
[0037]
【The invention's effect】
As described above, according to the present invention, it is possible to eliminate the problems of separator perforation, shrinkage, and electrode peeling after welding lead terminals to the battery while maintaining the high capacity of the battery. An excellent flat nonaqueous electrolyte secondary battery having a very large value can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a battery according to Example 1 of the present invention.
FIG. 2 is a partially enlarged portion of the first embodiment shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Positive electrode plate, 1a ... Positive electrode active material content layer, 1b ... Positive electrode collector, 2 ... Heat insulation material (positive electrode side), 3 ... Negative electrode plate, 3a ... Negative electrode active material content layer, 3b ... Negative electrode current collector, 4 Insulating material (negative electrode side), 5 separator, 6 insulating gasket, 7 negative electrode case, 8 positive electrode case.

Claims (4)

  1. A metal negative electrode case also serving as a negative electrode terminal and a metal positive electrode case also serving as a positive electrode terminal are fitted via an insulating gasket, and the positive electrode case or the negative electrode case is further crimped by caulking. In the flat non-aqueous electrolyte secondary battery in which at least a positive electrode active substance-containing layer, a negative electrode active substance-containing layer, a thin film separator are combined, and a non-aqueous electrolyte therein, the positive electrode and / or the negative electrode case A flat nonaqueous electrolyte secondary battery, wherein a non-metallic heat insulating material is provided between the thin film separator and the thin film separator.
  2. A positive electrode component having conductivity is exposed from one electrode group including at least a positive electrode, a separator, and a negative electrode to one outside in a direction horizontal to the flat surface of the flat battery, and the positive electrode component is directly or electrically applied to the positive electrode case. A structure in which a negative electrode component having conductivity is exposed to the other outside in the direction parallel to the flat surface of the flat battery of the electrode group, and the negative electrode component is directly or electrically connected to the negative electrode case. And the constituent exposed portions of the positive electrode and / or the negative electrode form a U-shape having a flat portion in a direction horizontal to the flat surface of the flat battery, and the heat insulating material is disposed inside the U-shape. The flat nonaqueous electrolyte secondary battery according to claim 1, wherein the flat nonaqueous electrolyte secondary battery is held.
  3. The flat nonaqueous electrolyte secondary battery according to claim 1, wherein the heat insulating material is made of glass and has a thickness of 0.05 mm to 0.20 mm.
  4. The flat nonaqueous electrolyte secondary battery according to claim 1, wherein a constituent material of the heat insulating material is made of a resin and has a thickness of 0.05 mm or more and 0.20 mm or less.
JP2000183001A 2000-06-19 2000-06-19 Flat non-aqueous electrolyte secondary battery Active JP4565530B2 (en)

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JP2000183001A JP4565530B2 (en) 2000-06-19 2000-06-19 Flat non-aqueous electrolyte secondary battery

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP2000183001A JP4565530B2 (en) 2000-06-19 2000-06-19 Flat non-aqueous electrolyte secondary battery
TW089116426A TW504854B (en) 1999-08-27 2000-08-15 Flat non-aqueous electrolyte secondary cell
US09/641,267 US6521373B1 (en) 1999-08-27 2000-08-17 Flat non-aqueous electrolyte secondary cell
EP00117368.1A EP1079454B1 (en) 1999-08-27 2000-08-23 Flat non-aqueous electrolyte secondary cell
KR1020000049510A KR100559363B1 (en) 1999-08-27 2000-08-25 Flat non-aqueous electrolyte secondary cell
CNB001262041A CN1180504C (en) 1999-08-27 2000-08-25 Flat nonaqueous electrolyte secondary cell
HK01106014A HK1035605A1 (en) 1999-08-27 2001-08-27 Flat non-aqueous electrolyte secondary cell.
US10/318,177 US7378186B2 (en) 1999-08-27 2002-12-13 Flat non-aqueous electrolyte secondary cell
US11/176,400 US7566515B2 (en) 1999-08-27 2005-07-08 Flat non-aqueous electrolyte secondary cell

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Publication number Priority date Publication date Assignee Title
JP4797238B2 (en) * 2000-11-22 2011-10-19 株式会社Gsユアサ battery
JP5114788B2 (en) * 2007-09-28 2013-01-09 三菱重工業株式会社 Lithium secondary battery

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08321287A (en) * 1995-03-20 1996-12-03 Matsushita Electric Ind Co Ltd Organic electrolyte battery
JPH09270272A (en) * 1996-04-01 1997-10-14 Japan Storage Battery Co Ltd Nonaqueous electrolyte secondary battery
JP2000067291A (en) * 1998-08-18 2000-03-03 Toyo Commun Equip Co Ltd Sorter for coin

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08321287A (en) * 1995-03-20 1996-12-03 Matsushita Electric Ind Co Ltd Organic electrolyte battery
JPH09270272A (en) * 1996-04-01 1997-10-14 Japan Storage Battery Co Ltd Nonaqueous electrolyte secondary battery
JP2000067291A (en) * 1998-08-18 2000-03-03 Toyo Commun Equip Co Ltd Sorter for coin

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