JP5329890B2 - Non-aqueous electrolyte battery - Google Patents

Description

  The present invention relates to a non-aqueous electrolyte battery.

  In recent years, with the development of electronic devices, lithium secondary batteries have been developed as non-aqueous electrolyte secondary batteries that are small, lightweight, have high energy density, and can be repeatedly charged and discharged. Recently, it is suitable for in-vehicle secondary batteries mounted on hybrid cars and electric cars, and secondary batteries for power storage used for power leveling. Development of non-aqueous electrolyte secondary batteries is also desired. As such a secondary battery, for example, as described in Patent Document 1, lithium titanium oxide (lithium titanium composite oxide) having a small particle size (average particle size of primary particles is 1 μm or less) as a negative electrode active material. A non-aqueous electrolyte secondary battery that can be rapidly charged and discharged with high power and has excellent cycle performance has been developed.

By the way, Patent Document 2 relates to a battery exterior body, and extends both exterior bodies on the side to be heat-sealed by sandwiching a battery tab to an extended end portion, and folds back at least one outer end portion of the extended end portion. It is disclosed that the exterior body is deformed and held in the folded state.
JP-A-2005-123183 JP2007-157615A

  An object of the present invention is to provide a non-aqueous electrolyte battery with low yielding tab shortage failure and excellent mass productivity and good yield.

The nonaqueous electrolyte battery of the present invention includes a container,
An electrode group housed in the container and including a positive electrode and a negative electrode;
A current collecting tab made of aluminum or aluminum alloy, which is plurally extended from the positive electrode or the negative electrode of the electrode group and overlapped with each other,
A protective lead having a radius R of 0.2 mm or more, which is bonded to at least one outermost layer of the current collecting tab and has a corner portion adjacent to the outermost layer among sides intersecting with the extending direction of the current collecting tab,
A lid that closes the opening of the container;
And an output terminal provided on the lid and electrically connected to the current collecting tab.

The nonaqueous electrolyte battery of the present invention includes a container,
An electrode group housed in the container and including a positive electrode and a negative electrode;
A current collecting tab made of aluminum or aluminum alloy, which is plurally extended from the positive electrode or the negative electrode of the electrode group and overlapped with each other,
A protective lead bonded to at least one outermost layer of the current collecting tab and having an end intersecting with an extending direction of the current collecting tab bent in a direction away from the outermost layer;
A lid that closes the opening of the container;
And an output terminal provided on the lid and electrically connected to the current collecting tab.

  According to the present invention, it is possible to provide a non-aqueous electrolyte battery with few yielding tab breakage defects and excellent mass productivity and good yield.

The nonaqueous electrolyte battery according to this embodiment includes a container,
An electrode group housed in the container and including a positive electrode and a negative electrode;
A current collecting tab made of aluminum or aluminum alloy, which is plurally extended from the positive electrode or the negative electrode of the electrode group and overlapped with each other,
A protective lead bonded to at least one outermost layer of the current collecting tab;
A lid that closes the opening of the container;
An output terminal provided on the lid and electrically connected to the current collecting tab;

(First embodiment)
In the nonaqueous electrolyte battery of the first embodiment, as shown in FIG. 1, a plurality of protective leads 2 are provided on one outermost layer of the current collecting tab 1 extending from the positive electrode or the negative electrode of the electrode group and superposed together. Are ultrasonically bonded, and a plurality of current collecting tabs 1 and protective leads 2 are integrated. According to ultrasonic bonding, fusing of the current collecting tab can be avoided when the thickness of one current collecting tab is as thin as 20 μm or less (more preferably 10 to 20 μm). Thereby, since the thickness of an electrode can be made thin and the reaction area of an electrode can be increased, the nonaqueous electrolyte battery excellent in a quick charge / discharge characteristic is realizable. The protective lead 2 is a strip-shaped metal plate material. The protective lead 2 has an R (curvature radius) of 0.2 mm or more at the corner portion 3 adjacent to the outermost layer among the corner portions 3 on the side intersecting with the extending direction of the current collecting tab 1. On the other hand, a conductive member (for example, a lead member and a lid described later) 4 is ultrasonically bonded to the other outermost layer of the current collecting tab 1.

  In addition, as shown in FIG. 2, the protective lead 2 may be folded in two, and a laminated body of the current collecting tabs 1 may be sandwiched therebetween to integrate them by ultrasonic bonding. In that case, the protective lead 2 has R of 0.2 mm or more in the corner portion 3 adjacent to each outermost layer among the corner portions 3 on the side orthogonal to the extending direction of the current collecting tab 1. A conductive member 4 is disposed outside the protective lead 2.

  According to the first embodiment illustrated in FIG. 1 and FIG. 2 described above, the ultrasonic wave is applied to the protective lead 2 during the ultrasonic bonding, but the corner at the side that intersects the extending direction of the current collecting tab 1. Since R of 0.2 mm or more is formed in the part 3, the defect that the current collecting tab 1 is cut can be eliminated. Moreover, even if the current collecting tab 1 is rubbed by the protective lead 2 when the electrode group is housed in the container after the ultrasonic bonding, the corner 3 has an R of 0.2 mm or more, so the current collecting tab It is possible to eliminate the defect that 1 breaks. As a result, it is possible to provide a non-aqueous electrolyte battery excellent in mass productivity and good in yield.

  The upper limit value of R is preferably 30 mm.

(Second Embodiment)
In the nonaqueous electrolyte battery according to the second embodiment, as shown in FIG. 3, a plurality of protective leads 2 are provided on one outermost layer of the current collecting tab 1 extending from the positive electrode or the negative electrode of the electrode group and superposed together. Are ultrasonically bonded, and a plurality of current collecting tabs 1 and protective leads 2 are integrated. According to the ultrasonic bonding, fusing of the current collecting tab when the thickness per current collecting tab is 20 μm or less (more preferably 10 to 20 μm) can be avoided. The protective lead 2 is a strip-shaped metal plate material. The protection lead 2 has an end portion 5 that intersects with the extending direction of the current collecting tab 1 bent in a direction away from the current collecting tab 1. The bending angle θ is desirably greater than 0 degree and 180 degrees or less. A conductive member 4 is ultrasonically bonded to the other outermost layer of the current collecting tab 1.

  Further, as shown in FIG. 4, the protective lead 2 may be folded in two, and a laminated body of the current collecting tabs 1 may be sandwiched therebetween to integrate them by ultrasonic bonding. In that case, both ends 5 of the protective lead 2 intersecting with the extending direction of the current collecting tab 1 are bent in a direction away from the current collecting tab 1. The bending angle θ is desirably greater than 0 degree and 180 degrees or less. A conductive member 4 is disposed outside the protective lead 2.

  According to the second embodiment illustrated in FIG. 3 and FIG. 4 described above, the ultrasonic vibration is applied to the protective lead 2 when ultrasonic bonding is performed, but the end portion 5 of the protective lead 2 is the current collecting tab 1. Since the current collector tab 1 is bent in a direction away from the current collecting tab 1, it is possible to eliminate a defect that the current collecting tab 1 is cut during ultrasonic bonding. Further, when the electrode group is stored in the container after ultrasonic bonding, even if the current collecting tab 1 is rubbed by the protective lead 2, the end 5 is bent in a direction away from the current collecting tab 1. The defect that the electric tab 1 is cut can be solved. As a result, it is possible to provide a non-aqueous electrolyte battery excellent in mass productivity and good in yield.

  In addition, the bending angle of the protective lead is made larger than 0 degree and 90 degrees or less during ultrasonic bonding, thereby eliminating the failure of the current collecting tab 1 during ultrasonic bonding and expanding the bending angle after ultrasonic bonding. By doing so, the end portion of the protective lead is not hindered when the electrode group is inserted into the container, and the electrode group can be smoothly accommodated in the container.

  3 and 4 described above, the example in which the end portion of the protective lead is bent has been described. However, the same effect can be obtained even if the protective lead is bent away from the current collecting tab 1.

  Further, R of 0.2 mm or more may be provided at the corner portion adjacent to the outermost layer of the current collecting tab at the end portion 5 of the protective lead 2. Thereby, it is possible to further reduce the failure of the current collector tab.

(Third embodiment)
In the nonaqueous electrolyte battery of the third embodiment, as shown in FIG. 5, the stacked body of current collecting tabs 1 is covered with a protective lead 2 bent into a U shape, and these are integrated by ultrasonic bonding. Has been. The short piece of the protective lead 2 is ultrasonically bonded to one outermost layer of the current collecting tab 1, and an end portion 5 intersecting with the extending direction of the current collecting tab 1 is bent in a direction away from the current collecting tab 1. The bending angle θ is desirably greater than 0 degree and 180 degrees or less. On the other hand, since the long piece 6 of the protective lead 2 also serves as a lead member, the tip is electrically connected to an output terminal or the like. Since the protective lead 2 also serves as a lead member, the conductive member 4 need not be used.

  On the other hand, as shown in FIG. 6, the end 5 of the short piece of the protective lead 2 may be folded outward. In this case, the bending angle θ is 180 degrees. This not only eliminates the failure of the current collector tab, but also prevents the end of the protective lead from interfering when the electrode group is inserted into the container, and allows the electrode group to be smoothly accommodated in the container. Become.

  The current collecting tab and the protective lead used in the first to third embodiments may be used for the positive electrode or the negative electrode, or for both the positive electrode and the negative electrode. The protective lead is formed from, for example, aluminum or an aluminum alloy. The thickness of the protective lead is preferably in the range of 3 to 40 times the thickness of one current collecting tab. Thereby, the tab breakage failure can be greatly reduced by making the corner portion of the protective lead into an R shape of 0.2 mm or more, or bending the end portion in a direction away from the current collecting tab.

  A method for measuring the R dimension and angle will be described below.

  The R dimension and angle of the protective lead near the ultrasonic joint are measured from the cross section. The cross section is obtained using a cutter and polisher manufactured by Buehler.

  The protective lead of about 1 cm to 3 cm including the end of the protective lead is cut out, the cut protective lead is placed in the case, and a mixture of resin (coagulated) and coagulant is poured around the protective lead. After the resin is cured, the protective lead is removed from the case together with the cured resin and cut with a cutter. After cutting, finish the cross section with a polishing machine to make a cut model. The cut model of the finished protective lead is R dimension measurement and angle measurement with a microscope made by Keyence.

  An example of the nonaqueous electrolyte battery to which the first to third embodiments are applied is shown in FIG.

  The container 10 is formed, for example, by subjecting a metal plate such as an aluminum plate or an aluminum alloy plate to deep drawing. The electrode group 11 is formed by, for example, winding a sheet-like positive electrode and a sheet-like negative electrode in a spiral shape with a separator in between, and then crushing and deforming the whole into a quadrangular cross-sectional shape that matches the cross-sectional shape of the container. It is produced by this.

  The positive electrode is produced, for example, by applying a slurry containing a positive electrode active material to a current collector made of an aluminum foil or an aluminum alloy foil. As the positive electrode active material, oxides, sulfides, polymers, and the like that can occlude and release lithium can be used. Preferable active materials include lithium manganese composite oxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium iron phosphate, and the like that can obtain a high positive electrode potential. The negative electrode is produced by applying a slurry containing a negative electrode active material to a current collector made of an aluminum foil or an aluminum alloy foil. As the negative electrode active material, metal oxides, metal sulfides, metal nitrides, alloys, and the like that can occlude and release lithium can be used. Preferably, the occlusion and release potential of lithium ions is 0.4 V or higher relative to the metal lithium potential. It is a substance. Since the negative electrode active material having such a lithium ion storage / release potential can suppress the alloy reaction between aluminum or an aluminum alloy and lithium, it is possible to use aluminum or an aluminum alloy for a negative electrode current collector and a negative electrode related component. And For example, there are titanium oxide, lithium titanium oxide, tungsten oxide, amorphous tin oxide, tin silicon oxide, silicon oxide, etc. Among them, lithium titanium composite oxide is preferable. As the separator, a microporous film, a woven fabric, a non-woven fabric, a laminate of the same material or different materials among these can be used. Examples of the material for forming the separator include polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-butene copolymer.

A non-aqueous electrolyte (not shown) is accommodated in the container 10 and impregnated in the electrode group 11. The non-aqueous electrolyte is prepared by dissolving an electrolyte (for example, a lithium salt) in a non-aqueous solvent. Examples of the non-aqueous solvent include ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), γ-butyrolactone (γ -BL), sulfolane, acetonitrile, 1,2-dimethoxyethane, 1,3-dimethoxypropane, dimethyl ether, tetrahydrofuran (THF), 2-methyltetrahydrofuran and the like. Nonaqueous solvents may be used alone or in combination of two or more. Examples of the electrolyte include lithium perchlorate (LiClO ₄ ), lithium hexafluorophosphate (LiPF ₆ ), lithium tetrafluoroborate (LiBF ₄ ), lithium hexafluoroarsenide (LiAsF ₆ ), and trifluoromethanesulfone. Examples thereof include lithium salts such as lithium acid lithium (LiCF ₃ SO ₃ ). The electrolyte may be used alone or in combination of two or more. The amount of electrolyte dissolved in the non-aqueous solvent is desirably 0.2 mol / L to 3 mol / L.

  The plurality of positive electrode current collecting tabs 12 are electrically connected to a plurality of positions of the positive electrode, and are respectively led upward from the upper end face of the electrode group 11. On the other hand, the plurality of negative electrode current collecting tabs 13 are electrically connected to a plurality of portions of the negative electrode, and each is led upward from the upper end face of the electrode group 11. As the positive electrode current collecting tab 12, for example, a positive electrode current collector partially extended can be used, but may be separate from the positive electrode. The negative electrode current collecting tab 13 may be, for example, a part in which a negative electrode current collector is partially extended, but may be separate from the negative electrode.

  As the protective lead 2, those shown in the first to third embodiments are used. Here, the structure shown in FIG. 5 is used. A positive electrode current collecting tab 12 and a negative electrode current collecting tab 13 are ultrasonically bonded to the protective lead 2.

  By the way, the opening of the container 10 is sealed by the sealing member 14. The sealing member 14 includes a lid 15 that closes the opening of the container 10, a negative output terminal (rivet) 17 that is caulked and fixed to the outer surface (upper surface) of the lid 15 via a gasket 16, and the outer surface (upper surface) side of the lid 15. And a positive electrode terminal 18 protruding in a convex shape.

  The lid 15 is made of a press-formed product made of a metal such as aluminum or an aluminum alloy plate. The pressure release valve includes an X-shaped groove 19 provided on the bottom surface in the recess located between the negative electrode output terminal 17 and the positive electrode terminal 18 on the upper surface of the lid 15, and the groove when the case internal pressure exceeds a certain pressure. 19 has a role of breaking and releasing the internal pressure.

  The negative electrode lead member 20 is disposed on the inner surface (lower surface) of the lid 15 via an insulator 21. The negative output terminal 17 is caulked and fixed to the lid 15, and further caulked and fixed to the negative electrode lead member 20. As a result, the negative electrode lead member 20 is electrically connected to the negative electrode output terminal 17. The material of the negative electrode output terminal 17 and the negative electrode lead member 20 is changed according to the material of the active material. When the negative electrode active material is lithium titanate, aluminum or an aluminum alloy can be used.

  The long piece 6 of the negative protective lead 2 is welded or joined to the negative lead member 20. Thereby, the negative electrode current collecting tab 13 is electrically connected to the negative electrode output terminal 17 via the protective lead 2 and the negative electrode lead member 20. On the other hand, the long piece 6 of the positive protective lead 2 is electrically connected to the positive terminal 18.

  The spacer 22 is disposed so as to surround a space provided between the inner surface (lower surface) of the lid 15 and the upper end surface from which the positive and negative electrode tabs 12 and 13 of the electrode group 11 protrude. The spacer 22 can prevent the electrode group 11 from moving when vibration or impact is applied to the battery. Furthermore, since the electrolyte injected from the electrolyte injection port tends to accumulate on the upper part of the electrode group 11, penetration of the electrolyte from the upper end surface of the electrode group 11 is promoted, and the electrolyte is uniformly distributed to the electrode group 11. Can be impregnated. Examples of the material of the spacer 22 include PP and PFA.

  In FIG. 7 described above, the rivet is used as the negative electrode terminal, and the portion protruding in a convex shape on the outer surface of the lid is used as the positive electrode terminal. It may be a negative terminal.

[Example]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Example 1
The positive electrode has a current collector in which an active material-containing layer containing lithium cobalt oxide (LiCoO ₂ ), graphite powder as a conductive agent, and polyvinylidene fluoride (PVdF) as a binder is made of aluminum or an aluminum alloy foil The sheet-like thing formed in both surfaces was used. On the other hand, the negative electrode includes a negative electrode active material powder having a lithium occlusion potential of 0.4 V or more with respect to the open circuit potential of lithium metal, carbon powder as a conductive agent, and polyvinylidene fluoride (PVdF) as a binder. The sheet-like thing in which the active material content layer containing this was formed on both surfaces of the electrical power collector which consists of aluminum or aluminum alloy foil was used. The electrode group is produced by winding them in a spiral shape while interposing a separator between the positive electrode and the negative electrode, and then crushing and deforming the whole into a quadrangular cross-sectional shape that matches the cross-sectional shape of the metal container. Those having the structure shown in FIG. 7 were used.

  As the positive electrode current collector tab, a positive electrode current collector extended in a strip shape at a plurality of locations (in this case, 50 points) was used. In addition, the negative electrode current collector tab was formed by extending the negative electrode current collector into a strip shape at a plurality of locations (in this case, 50 points). As shown in FIG. 1, for each of the positive electrode current collecting tab and the negative electrode current collecting tab, the tip portions of 50 current collecting tabs were overlapped, and an aluminum protective lead was disposed on one outermost layer. This protective lead had an R of 0.2 mm at the corner portion close to the outermost layer on the side intersecting the extending direction (longitudinal direction) of the current collecting tab.

  When the current collecting tab and the protective lead are ultrasonically welded, the defect rate at which the current collecting tab or the protective lead is cracked is measured, and the results are shown in Table 1 below. An ultrasonic welding machine manufactured by Nippon Emerson Co., Ltd. was used for welding. The tip angle of the horn of the ultrasonic welder was 90 °, and the pattern depth of the horn was equal to the thickness of the current collecting tab group and the protective lead.

  Table 1 below shows the thickness of the current collecting tab, the thickness of the protective lead, and the protective lead thickness ratio (times) per current collecting tab for each of the positive electrode and the negative electrode.

(Examples 2 to 7)
Except for changing the thickness of the protective lead, the protective lead thickness ratio (times) with respect to each current collecting tab, and the R size of the corner as shown in Table 1 below, the same as in Example 1 Then, the failure rate of tab breakage near the end of the protective lead during ultrasonic bonding was measured, and the results are shown in Table 1 below.

(Example 8)
A protective lead having the shape shown in FIG. 3 was used. That is, for positive and negative current collecting tabs similar to those described in Example 1, the tips of 50 current collecting tabs were overlapped, and an aluminum protective lead was disposed on one outermost layer. The protective lead was bent in a direction in which the end portion intersecting with the extending direction (longitudinal direction) of the current collecting tab was away from the outermost layer, and the bending angle was 5 degrees. The thickness of the protective lead and the protective lead thickness ratio (times) per current collecting tab are shown in Table 1 below.

  In the same manner as in Example 1, the failure rate of tab breakage near the end of the protective lead during ultrasonic bonding was measured, and the results are shown in Table 1 below.

(Examples 9 to 14)
Ultrasonic bonding in the same manner as in Example 8 except that the thickness of the protective lead, the protective lead thickness ratio (times) per current collecting tab, and the bending angle are changed as shown in Table 1 below. The failure rate of tab breakage near the end of the protective lead was measured, and the results are shown in Table 1 below.

(Example 15)
A protective lead having the shape shown in FIG. 2 was used. That is, for positive and negative current collecting tabs similar to those described in Example 1, the tips of 50 current collecting tabs were overlapped, and both outermost layers were protected in an aluminum shape by folding them into two U shapes. Covered with leads. The protective lead had an R of 0.2 mm at the corner portion adjacent to the outermost layer on the side intersecting the extending direction (longitudinal direction) of the current collecting tab. The thickness of the protective lead and the protective lead thickness ratio (times) per current collecting tab are shown in Table 2 below.

  In the same manner as in Example 1, the failure rate of tab breakage near the end of the protective lead during ultrasonic bonding was measured, and the results are shown in Table 2 below.

(Examples 16 to 21)
Except for changing the thickness of the protective lead, the protective lead thickness ratio (times) with respect to each current collecting tab, and the R size of the corner as shown in Table 2 below, the same as in Example 15 was applied. Then, the failure rate of tab breakage near the end of the protective lead during ultrasonic bonding was measured, and the results are shown in Table 2 below.

(Example 22)
A protective lead having the shape shown in FIG. 4 was used. That is, for positive and negative current collecting tabs similar to those described in Example 1, the tips of 50 current collecting tabs were overlapped, and both outermost layers were protected in an aluminum shape by folding them into two U shapes. Covered with leads. The protective lead was bent in a direction in which the end portion intersecting with the extending direction (longitudinal direction) of the current collecting tab was away from the outermost layer, and the bending angle was 5 degrees. The thickness of the protective lead and the protective lead thickness ratio (times) per current collecting tab are shown in Table 2 below.

  In the same manner as in Example 1, the failure rate of tab breakage near the end of the protective lead during ultrasonic bonding was measured, and the results are shown in Table 2 below.

(Examples 23 to 28)
Ultrasonic bonding in the same manner as in Example 22 except that the thickness of the protective lead, the protective lead thickness ratio (times) per current collecting tab, and the bending angle are changed as shown in Table 2 below. The failure rate of tab breakage near the end of the protective lead was measured, and the results are shown in Table 2 below.

(Comparative example)
Using a protective lead whose end is not bent and whose corner does not have an R shape, the rate of tab breakage failure near the end of the protective lead during ultrasonic bonding is measured in the same manner as in Example 1. The results are shown in Tables 1 and 2 below.

For the electrode group of the example and the comparative example, when the electrode group is stored in the metal container after the ultrasonic bonding process, it is evaluated whether or not a tab breakage defect near the end of the protective lead occurs, and the result is It shows in the following Table 1 and Table 2.

  As is clear from Tables 1 and 2, ultrasonic vibration is applied to the protective lead by setting the corner R of the protective lead to 0.2 mm or more, or by attaching a bending angle larger than 0 degrees to the end. However, it was found that the current collecting tab can be joined without damaging it, and that the tab breakage failure can be drastically reduced in the subsequent process of ultrasonic joining.

  Further, if the thickness per protective lead is 3 to 40 times that of one current collecting tab, the corner portion of the protective lead is formed into an R shape of 0.2 mm or more, or the end portion is bent more than 0 degree. By attaching an angle, tab breakage defects can be drastically reduced.

  Even when the protective lead is extended as shown in FIGS. 5 and 6 and also serves as a lead, the effect of reducing tab breakage is obtained by bending the protective lead.

  Further, as shown in FIG. 6, even in the structure in which the bent protective lead is bent back to about 180 degrees after ultrasonic bonding, the same effect is obtained with respect to the tab breakage.

  As described above, according to the present invention, a secondary battery having a low yield of tab breakage at the time of ultrasonic bonding and a low yield of tab breakage at a subsequent process of the ultrasonic bonding and excellent in mass production and good yield. Can provide.

  In the above-described embodiments, the battery using the non-aqueous electrolyte is described as an example, but the present invention can naturally be applied to a battery using a solid electrolyte or a polymer electrolyte instead of the non-aqueous electrolyte. Furthermore, the positive and negative electrode active materials are not limited to this, and other active materials can be used.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

Sectional drawing which shows the current collection tab used in the nonaqueous electrolyte battery which concerns on 1st Embodiment, a protection lead, and a conductive member. Sectional drawing which shows the current collection tab used in another nonaqueous electrolyte battery which concerns on 1st Embodiment, a protection lead, and a conductive member. Sectional drawing which shows the current collection tab used in the nonaqueous electrolyte battery which concerns on 2nd Embodiment, a protection lead, and a conductive member. Sectional drawing which shows the current collection tab used in another nonaqueous electrolyte battery which concerns on 2nd Embodiment, a protection lead, and a conductive member. Sectional drawing which shows the current collection tab and protection lead which are used with the nonaqueous electrolyte battery which concerns on 3rd Embodiment. Sectional drawing which shows the current collection tab and protection lead which are used with another nonaqueous electrolyte battery which concerns on 3rd Embodiment. The disassembled perspective view which shows the nonaqueous electrolyte battery which concerns on 1st-3rd embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Current collection tab, 2 ... Protection lead, 3 ... Corner part, 4 ... Conductive member, 5 ... End part of protection lead, 6 ... Long piece of protection lead, 10 ... Container, 11 ... Electrode group, 12 ... Positive electrode collection Electrical tab, 13 ... Negative current collecting tab, 14 ... Sealing member, 15 ... Lid, 16 ... Gasket, 17 ... Output terminal, 18 ... Positive terminal, 19 ... Pressure release valve, 20 ... Lead member, 21 ... Insulator, 22 …Spacer.

Claims (5)

A container,
An electrode group housed in the container and including a positive electrode and a negative electrode;
A current collecting tab made of aluminum or aluminum alloy, which is plurally extended from the positive electrode or the negative electrode of the electrode group and overlapped with each other,
A protective lead having a radius R of 0.2 mm or more, which is bonded to at least one outermost layer of the current collecting tab and has a corner portion adjacent to the outermost layer among sides intersecting with the extending direction of the current collecting tab,
A lid that closes the opening of the container;
A non-aqueous electrolyte battery comprising an output terminal provided on the lid and electrically connected to the current collecting tab. A container,
An electrode group housed in the container and including a positive electrode and a negative electrode;
A current collecting tab made of aluminum or aluminum alloy, which is plurally extended from the positive electrode or the negative electrode of the electrode group and overlapped with each other,
A protective lead bonded to at least one outermost layer of the current collecting tab and having an end intersecting with an extending direction of the current collecting tab bent in a direction away from the outermost layer;
A lid that closes the opening of the container;
A non-aqueous electrolyte battery comprising an output terminal provided on the lid and electrically connected to the current collecting tab. The nonaqueous electrolyte battery according to claim 2, wherein the bending angle of the protective lead is less than greater 180 degrees than 0 degrees. The protective lead is ultrasonically bonded with the bending angle folding below than 90 degrees above 0 degrees to the outermost layer of the current collector tabs, characterized in that to enlarge the bending angle after the ultrasonic bonding The nonaqueous electrolyte battery according to claim 2.   5. The nonaqueous electrolyte battery according to claim 1, wherein the thickness of the protective lead ranges from 3 to 40 times the thickness of one current collecting tab.

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