JP2001093579A - Non-aqueous electrolytic secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-aqueous electrolyte secondary battery, such as a lithium secondary battery, which can draw electric power generated by a wound electrode body 5 received in a battery case from electrode terminals attached on the battery can to the outside, and has an improved collector efficiency and discharging characteristic. SOLUTION: Either end of the wound electrode body 5 has a protrusion formed by end edges of band-shaped cores constituting the positive or negative electrode. The protrusion 58 generally has a conical convex surface shape. The protrusion 58 is covered with an overhanging current collector cap 6. The collector cap 6 is laser-welded to the protrusion 58 at its inner surface, and is connected to electrode terminals while interposing a lead member therebetween.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte in which a wound electrode body is accommodated in a battery can and power generated by the wound electrode body can be taken out from an electrode terminal attached to the battery can. It relates to a secondary battery.

[0002]

2. Description of the Related Art In recent years, lithium secondary batteries having a high energy density have attracted attention as power sources for portable electronic devices, electric vehicles and the like. For example, as shown in FIGS. 7 and 8, a cylindrical lithium secondary battery having a relatively large capacity has a cylindrical body (11).
The wound electrode body (2) is accommodated in a cylindrical battery can (1) in which lids (12) and (12) are welded and fixed to both ends of the battery electrode (2). A pair of positive and negative electrode terminal mechanisms (9) and (9) are attached to both lids (12) and (12).
(2) and the two electrode terminal mechanisms (9) and (9) are composed of a plurality of electrode tabs.
The electric power generated by the winding electrode body (2), which is connected to each other by (3), can be taken out from the pair of electrode terminal mechanisms (9, 9) to the outside. Further, a pressure opening / closing gas discharge valve (13) is attached to each lid (12).

[0003] As shown in FIG. 9, the winding electrode body (2)
A band-shaped separator (22) is interposed between the band-shaped positive electrode (21) and the band-shaped negative electrode (23), and these are spirally wound. The positive electrode (21) is configured by applying a positive electrode active material (24) made of a lithium-containing composite oxide to both surfaces of a band-shaped core (25) made of aluminum foil, and the negative electrode (23) is made of a band made of copper foil. Negative electrode active material containing carbon material on both sides of core (27)
(26) is applied. In the separator (22),
Non-aqueous electrolyte is impregnated. The positive electrode (21) has a non-coated portion on which the positive electrode active material (24) is not applied, and the base ends of the plurality of electrode tabs (3) are joined to the non-coated portion. I have. Similarly, on the negative electrode (23), a non-coated portion on which the negative electrode active material (26) is not applied is formed, and the base ends of the plurality of electrode tabs (3) are joined to the non-coated portion. I have.

[0004] As shown in FIG. 8, a plurality of electrode tabs (3) having the same polarity are provided with one electrode terminal mechanism (31).
It is connected to (9). In FIG. 8, for convenience,
Only the state in which the tip of some of the electrode tabs is connected to the electrode terminal mechanism (9) is shown, and for the other electrode tabs, the state in which the tip is connected to the electrode terminal mechanism (9) is shown. Omitted.

[0005] The electrode terminal mechanism (9) is provided with a lid (1) of the battery can (1).
The screw member (91) has a flange (92) formed at the base end of the screw member (91). An insulating packing (93) is attached to the through-hole of the lid (12), so that electrical insulation and sealing between the lid (12) and the fastening member (91) are maintained. A washer (94) is fitted into the screw member (91) from the outside of the lid (12), and a first nut (95) and a second nut (96) are screwed into the screw member (91). And the first nut (9
5) Tighten the flange (92) of the screw member (91) and the washer (9).
By pinching the insulating packing (93) by 4),
It has improved sealing performance. The tips (31) of the plurality of electrode tabs (3) are fixed to the flange (92) of the screw member (91) by spot welding or ultrasonic welding.

By the way, in a lithium secondary battery,
With the increase in battery capacity, the length of the positive electrode and the negative electrode increases, so the current collecting structure using the electrode tabs has low current collecting properties,
Problems such as variations in the internal resistance and a decrease in the discharge capacity occur. In addition, the high-rate discharge characteristics are significantly reduced, which is a serious problem.

Therefore, a current collecting structure as shown in FIG. 10 has been proposed. In the current collecting structure, the wound electrode body (4)
Similarly, a positive electrode (41) formed by applying a positive electrode active material (44) to the surface of a core (45), and a negative electrode (formed by applying a negative electrode active material (46) to the surface of a core (47)) 43) and a separator (42) impregnated with a non-aqueous electrolyte.The positive electrode (41) and the negative electrode (43) are respectively superposed on the separator (42) so as to be shifted in the width direction, and have a spiral shape. Has been wound up. As a result, at one of the two ends in the winding axis direction of the winding electrode body (4), the end of the core body (45) of the positive electrode (41) is moved outward from the edge of the separator (42). The edge protrudes, and at the other end, the edge of the core (47) of the negative electrode (43) protrudes outward from the edge of the separator (42). A disk-shaped current collector (32) is laser-welded to both ends of the wound electrode body (4), and the current collector (32) is connected to the electrode terminal mechanism via a lead member (33). Connected to (9).

[0008]

However, FIG.
In the non-aqueous electrolyte secondary battery having the current collecting structure shown in (1), the area of the edge of the core (45) (47) constituting the positive electrode (41) and the negative electrode (43) of the wound electrode body (4) Therefore, there is a problem that the contact area between the end of the core body and the current collector (32) is small, thereby increasing the contact resistance and reducing the current collection efficiency.

In order to solve this problem, a disk-shaped current collector
Instead of (32), a current collecting member (34) having a plurality of slits (35) recessed as shown in FIG. 11 is provided at the end of the winding electrode body, and the slit of the current collecting member (34) is provided. A current collecting structure has been proposed in which the electrode edge is fitted into (35), and the surface of the current collecting member (34) is subjected to laser welding to join the current collecting member (34) to the electrode edge. (JP-A-10-261441). However,
The current collecting structure requires a current collecting member (34) having a complicated shape, which not only increases the manufacturing cost but also has a problem that the high-rate discharge characteristics are still insufficient. Therefore, an object of the present invention is to improve the current collection efficiency and obtain good high-rate discharge characteristics in a non-aqueous electrolyte secondary battery such as a lithium secondary battery.

[0010]

In the non-aqueous electrolyte secondary battery according to the present invention, a non-aqueous electrolyte is contained between a positive electrode (51) and a negative electrode (53) in a battery can (1). A winding electrode body (5) with a separator (52) interposed is housed therein, and each of the positive electrode (51) and the negative electrode (53) is formed by applying an active material to the surface of a strip-shaped core body. The electric power generated by the electrode body (5) is
It can be taken out from the electrode terminal mechanism (9) attached to the battery can (1). Here, a positive electrode (51) or a negative electrode (5) is attached to at least one end of the wound electrode body (5).
The edge of the band-shaped core constituting 3) protrudes, and the electrode body end face (58) formed by the edge has a conical convex or concave surface as a whole. The end face of the electrode body (58) is covered with a current collector (6) in the shape of a shade or inverted shade, and the current collector (6)
Is welded to the electrode body end face (58), and the current collector (6) is connected to the electrode terminal mechanism (9).

The conical convex or concave surface of the end face (58) of the electrode body has a trapezoidal or triangular shape of a non-coated portion of the strip electrode to which the active material is not applied, and winds the electrode in a spiral shape. It can be formed by the following.

In the above non-aqueous electrolyte secondary battery of the present invention, in the assembling step, the current collecting plate (6) is placed over the end of the winding electrode body (5) and pressed to thereby form the winding electrode. The edge of the core protruding from the end of the body (5) is pressed against the inclined inner surface of the current collector (6), and of the pressing force, the winding electrode body
(5) bends under the component force in the direction perpendicular to the winding axis,
The outer peripheral surface of the bent portion is in close contact with the inner surface of the current collector (6) to form an electrode body end surface (58). As a result, the wound electrode body (5)
End surface (58) and the inner surface of the current collector (6) come into contact with a large area.

In this state, the surface of the current collector (6) is irradiated with a laser beam, and is subjected to laser welding, thereby obtaining the current collector.
The inner surface of (6) is joined to the end surface (58) of the wound electrode body (5) with a large contact area. As a result, the wound electrode body (5)
A good bonding state is obtained between the electrode and the current collector (6) over the entire length of the electrode, the current collecting performance by the current collector (6) becomes uniform, and the electric resistance of the joint is obtained. Is kept to a small value. This improves current collection efficiency.

The end surface (58) of the wound electrode body (5) is not limited to a configuration in which the whole is formed as a conical convex surface or a concave surface. Five
Even when a part of 8) is formed with a slope inclined with respect to the winding axis of the winding electrode body (5), the same effect as described above can be obtained at the slope part, so that the current collection efficiency is higher than in the past. Be improved.

The end face (58) of the wound electrode body (5) is
Between the outer diameter D and the height H of the cone formed by (58),
It is desirable to configure so that the following relational expression 2 holds.

0.05 ≦ H / D ≦ 0.25 This is because when the ratio H / D is less than 0.05, the electrode body end face (5
8), the effect of bending the edge of the electrode core body to obtain a large contact area cannot be sufficiently obtained.
If / D exceeds 0.25, the dead space in the battery can becomes large, and the energy density decreases.

The current collector 6 preferably has one or a plurality of injection holes so that the electrolyte can be sufficiently supplied to the winding electrode 5.
The current collector (6) is made of Ni, Al, C
It is desirable to form it from a material such as u, SUS, or Ti. In addition, considering the capacity loss of the current collecting structure by the current collecting panel (6), the ratio of the outer diameter to the total length (outer diameter / total length) of the wound electrode body (5) is 0.2 to 0.2. It is desirably in the range of 5.

[0017]

According to the non-aqueous electrolyte secondary battery of the present invention, the current collection efficiency of the current collector (6) with respect to the wound electrode body (5) is improved. Also, the reactivity of the electrodes becomes more uniform,
The utilization rate of the electrode active material is improved, and excellent high rate discharge characteristics can be obtained.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention applied to a lithium ion secondary battery will be specifically described below with reference to the drawings. It should be noted that the present invention is not limited to the following examples in any way, and can be implemented by appropriately changing the scope without changing the gist of the invention.

[0019]overall structure  The lithium ion secondary battery according to the present invention has a structure as shown in FIG.
The lids (12) and (12) are fixed to both ends of the cylindrical body (11) by welding.
The wound electrode body (5) is placed inside a cylindrical battery can (1).
It is configured to house. Both lids (12) and (12) have positive and negative
A pair of electrode terminal mechanisms (9) and (9) are attached. electrode
The terminal mechanism (9) has the same configuration as the conventional one. or,
Each lid (12) is equipped with a pressure opening / closing gas exhaust valve (13)
Have been.

Conical end faces (58) are formed at both ends of the wound electrode body (5), and a cap-shaped current collector (6) is put on the electrode body end face (58). Laser welded to the end face (58). A lead member (61) is provided on the surface of the current collector (6).
And the distal end of the lead member (61) is joined to the flange (92) of the electrode terminal mechanism (9) by spot welding or ultrasonic welding.

[0021]Configuration of winding electrode body (5)  As shown in FIG. 3, the winding electrode body (5) has a strip shape.
A belt-like separator (52) is interposed between the positive electrode (51) and the negative electrode (53).
And these are spirally wound.
You. The positive electrode (51) is a band-shaped core (55) made of aluminum foil.
The positive electrode active material (5
4) is applied, and the negative electrode (53) is a strip made of copper foil.
Negative electrode active material (56) containing carbon material is applied to both sides of core (57)
It is configured. Non-aqueous electrolyte is used for the separator (22).
Is impregnated.

The positive electrode (51) has a positive electrode active material as shown in FIG.
The coated portion (54) is applied, and the non-coated portion not coated with the positive electrode active material (54) is formed, and the planar shape of the non-coated portion is in the direction along the winding axis. It has a trapezoidal shape (A <B) with different widths at both ends. The negative electrode (53) also has a coated portion on which the negative electrode active material (56) is applied and a non-coated portion on which the negative electrode active material (56) is not applied as shown in FIG. The planar shape of the non-coated portion is vertically symmetrical with the non-coated portion of the positive electrode (51) shown in FIG. 4, and has a trapezoidal shape in which the width in the direction along the winding axis is different at both ends (A <B). Is presented.

As shown in FIG. 3, the positive electrode (51) and the negative electrode
Each of (53) is superposed on the separator (52) while being shifted in the width direction, and is wound in a spiral shape, so that one end of both ends in the winding axis direction of the winding electrode body (5) has: The core of the positive electrode (51) outward from the edge of the separator (52)
The edge of (55) protrudes, the edge forms a chevron-shaped end surface (58), and at the other end, the core of the negative electrode (53) outwards from the edge of the separator (52). The edge of (57) protrudes,
The edge forms a chevron end face (58).

[0024]Current collecting structure  As shown in FIG. 2, it is located at both ends of the wound electrode body (5).
Each current collecting board (6) is installed. The current collector (6) is wound up
It is formed in a hat shape that can be in close contact with the end face (58) of the electrode body (5).
For supplying the electrolytic solution to the winding electrode body (5).
A liquid injection hole (62) is provided. On the surface of the current collector (6)
Is connected to the base end of the lead member (61).

As shown in FIG. 6 (a), for example, with the current collector (6) placed on the positive electrode end of the wound electrode body (5), the inner surface of the current collector (6) is The edge of the core body (55) of the positive electrode (51) is in contact with the positive electrode (51). From this state, the current collector (6) is taken up and the electrode assembly is wound.
6 (b), the edge of the core body (55) is pressed against the inner surface of the current collector (6) as shown in FIG. 6 (b). ) Is bent in the direction along the inner surface of the current collector (6) as shown by the first component force in the direction orthogonal to the winding axis, and the outer peripheral surface of the bent portion is formed by the second component force in the winding axis direction. (59) comes into close contact with the inner surface of the current collector (6). In this state, the surface of the current collector (6) is irradiated with a laser beam,
Apply laser welding. As a result, the electrode body end surface (58) formed by the outer peripheral surface (59) of the bent portion of the positive electrode core (55) is joined to the inner surface of the current collector (6) with a large contact area.

Similarly, a current collector (6) is placed on the negative electrode side end of the wound electrode body (5), and the current collector (6) is wound on the wound electrode body.
While being pressed to the (5) side, the surface of the current collector (6) is irradiated with a laser beam to perform laser welding. As a result, the electrode body end surface (58) formed by bending the edge of the negative electrode core (57)
Are joined to the inner surface of the current collector (6) with a large contact area.

[0027]

EXAMPLES As follows, a lithium ion secondary battery of the present invention and a comparative battery were actually manufactured, and battery characteristics were measured.

[0028]Preparation of positive electrode  Positive electrode active material (LiCoO₂), Conductive agent (carbon powder) and
A positive electrode mixture consisting of a binder (fluororesin powder) is
Doctor blade method on both sides of aluminum foil as
And dried under vacuum at 150 ° C for 2 hours.
Pole piece (width 50 mm, length 1500 mm, width 7 of uncoated part)
mm). Then, the non-coated part of the positive electrode piece is slanted.
In the longitudinal direction of the uncoated portion as shown in FIG.
The width A in the winding axis direction of one end of both ends is 2 mm,
The width B of the other end in the winding axis direction was 7 mm,
The positive electrode used for the pond was obtained.

[0029]Fabrication of negative electrode  It consists of a negative electrode material (graphite powder) and a binder (fluororesin powder).
Negative electrode mixture on both sides of copper foil as negative electrode core
Coating by blade method, vacuum drying at 150 ° C for 2 hours
To the negative electrode piece (width 55 mm, length 1600 mm,
The width of the coated part was 7 mm). Then, the non-
The coated part is cut diagonally, and the uncoated part is cut as shown in FIG.
Of the two ends in the longitudinal direction, the width in the winding axis direction of one end
A is 2 mm, and the width B of the other end in the winding axis direction is 7 mm.
Thus, a negative electrode used in the battery of the present invention was obtained.

[0030]Preparation of electrolyte  Mixed solution of ethylene carbonate and diethyl carbonate
LiPF for the medium₆The solute was dissolved to prepare an electrode solution.

[0031]Battery assembly  The active materials of the positive electrode and the negative electrode face each other via the separator.
The positive electrode, the negative electrode, and the separator
These are spirally wound to form a wound electrode body.
Was. At this time, as shown in FIG. 3, the winding of the winding electrode body (5) is performed.
Of both ends in the axial direction, the separator (5
The edge of the core (55) of the positive electrode (51) projects outward from the edge of (2)
At the other end, more outward than the edge of the separator (52).
Laminated so that the edge of the core (57) of the negative electrode (53) projects
Was performed. In addition, apply each to both ends of the winding electrode body (5).
The positive electrode (51) and the positive end (58) are formed so that
The negative electrode (53) has a large width of the uncoated portion from one end to the other.
Was wound up toward the end. Note that the separator (2
2) As a microporous material made of ion-permeable polypropylene
A membrane was used. As a result, a winding wire having an outer diameter of 28 mm
Polar body (5) was obtained.

Thereafter, an aluminum conical current collector (6) (outer diameter: 28 mm, height: 5 mm, thickness: 200 μm) is formed on the end face (58) of the wound electrode body (5), which is the positive electrode edge. )
Was pressed to perform laser welding. Similarly, a conical current collector 6 made of nickel (outer diameter 28 mm, height 5 m) is formed on the electrode body end face 58 formed by the negative electrode edge of the wound electrode body 5.
m, 150 μm in thickness), and laser welding was performed. A lead member (61) having a width of 5 mm and a length of 30 mm is joined to each current collector (6).

Further, an aluminum cylinder (11) and lids (12) and (12) to form the battery can (1) are produced, and each lid (12) has an electrode terminal mechanism (9). Was attached. And current collection board (6)
The wound electrode body (5) to which (6) was joined was loaded into the inside of the cylindrical body (11). And the lead member of the current collector (6) on the positive electrode side
(61), the electrode terminal mechanism attached to the lid (12)
After connection to (9), the lid (12) was fixed to the opening edge of the cylinder (11) by laser welding. Similarly, the current collector on the negative electrode side
After connecting the lead member (61) of (6) to the electrode terminal mechanism (9) attached to the lid (12), the lid (12) is connected to the cylindrical body (1).
It was fixed to the opening edge of 1) by laser welding. Finally, after the electrolyte was injected into the battery can (1), a gas discharge valve was screwed into the injection hole to complete the battery A of the present invention.

[0034]Measurement of battery characteristics  Perform a charge / discharge test under the conditions described below and define
The capacity retention ratio R (%) of high-rate discharge to low-rate discharge
Calculated. C1 is the discharge capacity at a current value of 5A, and C2 is
This is the discharge capacity at a current value of 400 mA.

[0035]

R = (C1 / C2) × 100

The conditions for the low rate discharge are a charging current of 400 mA,
The charge end voltage was set to 4.1 V, the discharge current was set to 400 mA, and the discharge end voltage was set to 2.7 V. The conditions of high-rate discharge were as follows: charge current 400 mA, charge end voltage 4.1 V, discharge current 5
A, the discharge end voltage was set to 2.7V.

[0037]Experiment 1  In Experiment 1, the battery A of the present invention and the conventional current collecting structure were used.
High-rate discharge characteristics were compared between the comparative batteries X and Y.
became. Table 1 shows the results. In addition, the comparison battery X
Only the pole side uses the conventional current collection structure shown in FIG.
There, width 50mm, length 1500mm, width of uncoated part
5 mm positive electrode, 10 sheets of 5 mm width
Except for welding the aluminum electrode tab,
Comparative Battery X was produced in the same manner as Inventive Battery A. or,
The comparative battery Y has a conventional current collector structure shown in FIG.
50mm in width and 1500 in length
mm, with a 5 mm wide positive electrode in the uncoated part, 5 mm in length,
The six current collectors (34) with a height of 5 mm and a width of 3 mm
Insert the positive electrode edge into the slit (35) and perform laser welding.
Except for having performed the above, the same procedure as in the above battery A of the present invention was carried out.
Comparative battery Y was produced.

[0038]

[Table 1]

As is clear from the results shown in Table 1, the battery A of the present invention has a higher discharge capacity retention ratio R than the comparative batteries X and Y.
And the high rate discharge characteristics are good. This is because, since the end surface (58) of the wound electrode body is formed in a convex convex shape, the current collector (6) is pressed against the end surface to perform laser welding, thereby collecting the end surface (58) of the electrode body. The state of bonding with the inner surface of the power board (6) became good, and as a result, the positive electrode (51) and the negative electrode (5)
This is because the reaction of 3) was uniformed and the high rate discharge capacity was increased.

[0040]Experiment 2  In Experiment 2, the following batteries B0 to B4 of the present invention were prepared,
The optimum range of the shape of the electrode body end face (58) was studied. Non
Except for using a positive electrode with a coating portion width B of 10 mm,
A battery B0 of the invention was produced in the same manner as the electrode A of the invention.
Except for using the positive electrode with the width B of the uncoated part of 9 mm,
Battery B1 of the invention was made in the same manner as Battery A of the invention.
Except for using a positive electrode with a width B of 5 mm for the uncoated part,
Battery B2 of the invention was made in the same manner as Battery A of the invention.
Other than using a positive electrode with a width B of 3.5 mm in the uncoated part
Prepared battery B3 of the present invention in the same manner as battery A of the present invention.
did. Except for using a positive electrode with a non-coated part width B of 3 mm
A battery B4 was produced in the same manner as in the production of the battery A.

Table 1 shows the measurement results of the high-rate discharge characteristics of each of the batteries thus manufactured. As is clear from Table 1, the ratio (BA) / D of the height (BA) to the outer diameter D of the cone formed by the electrode body end face (58) is 0.05.
At the time described above, the discharge capacity retention ratio R is particularly large. However, when the ratio (BA) / D exceeds 0.25, the discharge capacity retention ratio R maintains a large value.
As a result of the steep slope of the chevron of (58), the dead space in the battery can increases, and the energy density decreases. Therefore, as the shape of the electrode body end surface (58),
It can be said that it is desirable to use those in the range of 0.05 ≦ (BA) /D≦0.25.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a main part of a lithium ion secondary battery according to the present invention.

FIG. 2 is an exploded perspective view of a winding electrode body and a current collector used in the lithium ion secondary battery.

FIG. 3 is a partially developed perspective view of a wound electrode body.

FIG. 4 is a development view of a positive electrode.

FIG. 5 is a development view of a negative electrode.

FIG. 6 is an enlarged sectional view showing a step of laser welding a current collector to an end face of a wound electrode body.

FIG. 7 is a perspective view showing the appearance of a lithium ion secondary battery.

FIG. 8 is a partially cutaway front view showing a main part of a conventional lithium ion secondary battery.

FIG. 9 is a partially developed perspective view of a wound electrode body used in the lithium ion secondary battery.

FIG. 10 is a partially exploded perspective view of a wound electrode body used in another conventional nonaqueous electrolyte secondary battery.

FIG. 11 is a perspective view of a current collecting member used in still another conventional non-aqueous electrolyte secondary battery.

[Explanation of symbols]

 (1) Battery can (11) Cylindrical body (12) Lid (5) Winding electrode body (51) Positive electrode (52) Separator (53) Negative electrode (54) Active material (55) Core (56) Active material ( 57) Core body (58) End face of electrode body (6) Current collector (61) Lead member (62) Injection hole

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takeshi Maeda 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Atsuhiro Funabashi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Toshiyuki Noma 2-5-5 Sanyo Electric Co., Ltd., Moriguchi City, Osaka (72) Inventor Ikuo Yonezu Keihan Hondori, Moriguchi City, Osaka 2-5-5 Sanyo Electric Co., Ltd. F-term (reference) 5H022 AA09 BB02 BB11 BB17 CC02 CC13 CC19 5H029 AJ00 AJ02 AK03 AL07 AM02 AM03 AM07 BJ02 BJ14 CJ03 CJ05 DJ02 DJ05 DJ14 HJ03 HJ12

Claims (5)

[Claims] A positive electrode (51) and a negative electrode (5) are provided inside a battery can (1).
The wound electrode body (5), which is formed by interposing a separator (52) containing a non-aqueous electrolyte between 3), is housed, and a positive electrode (51) and a negative electrode
(53) is constituted by applying an active material to the surface of the belt-shaped core, and the power generated by the winding electrode (5) is supplied from the electrode terminal mechanism (9) attached to the battery can (1). In a non-aqueous electrolyte secondary battery that can be taken out, at least one end of the wound electrode body (5) has a positive electrode (5
1) Or the edge of the band-shaped core constituting the negative electrode (53) protrudes,
At least a part of the electrode body end face (58) formed by the edge is formed with a slope inclined with respect to the winding axis of the winding electrode body (5), and the electrode body end face (58) is a current collector. The current collector (6) is covered with a panel (6), the inner surface of the current collector (6) is welded to the electrode body end face (58), and the current collector (6) is connected to the electrode terminal mechanism (9). Non-aqueous electrolyte secondary battery. 2. The non-aqueous electrolyte secondary battery according to claim 1, wherein the current collector (6) is laser-welded to an end face (58) of the winding electrode body (5). 3. The end face (58) of the winding electrode body (5) is a conical convex or concave surface as a whole.
3. The non-aqueous electrolyte secondary battery according to claim 2, wherein the non-aqueous electrolyte secondary battery has a cap shape or an inverted cap shape. 4. An edge of a core protruding from an end of the winding electrode body (5) is pressed against an inner surface of the current collector (6) and bent along the inner surface, and an outer periphery of the bent portion is formed. Electrode body end face by face (58)
The non-aqueous electrolyte secondary battery according to claim 3, wherein 5. A relational expression of the following expression 1 is established between an outer diameter D and a height H of a cone formed by the end face (58) of the winding electrode body (5). 3. The non-aqueous electrolyte secondary battery according to 1. ## EQU1 ## 0.05 ≦ H / D ≦ 0.25