JP3407699B2 - Wound secondary battery - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound type secondary battery, and more particularly, a wound group having an axial core is housed in a battery container, and a pole is provided with a hole formed in the battery cover from inside the battery container. The present invention relates to a wound secondary battery, which penetrates to serve as an external terminal and in which an elastic member having electrical insulation is interposed between the battery lid and the flange portion of the pole.

[0002]

2. Description of the Related Art Recent advances in electronic technology have improved the performance of electronic equipment and made them smaller and more portable.
Batteries with higher energy density are desired as a power source for electronic devices. For this reason, much research has been conducted on lithium secondary batteries using, as a negative electrode, metallic lithium or a lithium alloy, which has the excellent characteristics of small self-discharge and light weight. However, this battery has a problem in that metallic lithium is deposited in a dendrite form on the negative electrode during charge and discharge, and thus a short circuit with the positive electrode is likely to occur.

Therefore, as a battery system that overcomes this problem, an organic electrolyte secondary battery using a carbon material for the negative electrode has been put into practical use. In the organic electrolyte secondary battery, since doping / dedoping of lithium ions into the carbon layer is used for the negative electrode reaction, metallic lithium is not deposited by an appropriate battery design. Therefore, it can be said that the battery is safer than the lithium secondary battery described above.

FIG. 5 shows a conventional example of such an organic electrolyte secondary battery. As shown in FIG. 5, in the organic electrolyte secondary battery 100, the winding group 12 has a protruding portion protruding from the aluminum positive electrode pole 20 (the negative electrode pole (not shown) is pure copper) toward the winding group 12. It is supported by being inserted into a tubular shaft core 14 which is the center of the winding group 12.
Positive electrode lead 30 extended from the positive electrode current collector of winding group 12
Are bundled and ultrasonically welded to the positive electrode pole 20 with a pressing metal fitting (not shown) interposed therebetween. The positive electrode pole 20 is assembled with the insulating ring 26, the O-ring 28, and the battery lid 18, and is tightened with the nut 22 via the insulating washer 24 to be fixed to the battery lid 18. By tightening the nut, the O-ring 28 is fixed. Obtaining sealing pressure. The battery lid 18 is fixed to the battery container 16 made of stainless steel such as SUS304 by laser welding. The negative electrode side is the same as the positive electrode side.

Due to its high capacity and high characteristics, such an organic electrolyte secondary battery has recently been used as a power source for an electric vehicle (EV) by connecting a plurality of organic electrolyte secondary batteries in series or in parallel. It has become possible to be.

[0006]

However, when the above-mentioned secondary battery is used as a power source for an electric vehicle,
Since a plurality of large-capacity secondary batteries are connected and used, the weight and volume of the secondary battery are considerable. Therefore, reducing the weight and size of the secondary battery alone is a major issue. In addition, when a secondary battery is installed in a vehicle, vibration and gravitational acceleration due to sudden acceleration / deceleration are also applied, so it is safe to secure the insulation of the battery case of the pole column etc. It is necessary to make every effort to avoid the above and internal short circuit.

In view of the above problems, it is an object of the present invention to provide a wound-type secondary battery which can achieve weight reduction and size reduction while ensuring insulation and liquid-tightness of the pole portion.

[0008]

In order to solve the above-mentioned problems, according to the present invention, a winding group having a shaft core is housed in a battery container, and a pole is formed in the battery container from a hole formed in the battery cover. In the winding type secondary battery, wherein an elastic member having electrical insulation is interposed between the battery lid and the flange portion of the pole pillar, the wound pole is an external terminal. Is formed to reduce the weight of the thin-walled portion, abutting the thin-walled portion and the battery lid with electrical insulation,
A gap holding member that holds the gap between the flange portion and the battery lid constant in a state where the elastic member is elastically deformed, the battery lid is pressed by a pressing force and is joined to the battery container, The battery lid and the flange portion are pressed against each other by the pressing force via the elastic member, and the shaft core and the pole column are in direct contact with each other and pressed against each other by the pressing force. Characterize. In the present invention, the flange portion and the battery lid are held by the spacing member at a constant distance in a state where the elastic member is elastically deformed, and the pole post and the shaft core are in direct contact with each other. When pressed by pressure and joined to the battery container, pressing force is applied to the battery lid and the pole, and the pole and the shaft core are fixed in a pressed state. Therefore, it is possible to fix the pole column without using a fastening member such as a nut or a metal washer for fixing the pole column to the battery lid as in the conventional case, so that the winding type secondary battery can be miniaturized. You can In addition, since the thin pole portion is formed in the pole pillar to reduce the weight of the pole pillar, the weight of the wound secondary battery can be reduced. In addition, since the battery lid and the poles are insulated by the elastic member having electrical insulation and the spacing member that electrically contacts the thin portion and the battery lid, the space retaining member is electrically insulated. Can maintain the proper insulation. Further, since the gap between the battery lid and the flange portion is kept constant in a state where the elastic member is elastically deformed, liquid tightness can be secured.

In this case, the spacing member is a rod-shaped member having rigidity against a pressing force, and the rod-shaped member is electrically insulated from at least one of the thin-walled portion and the battery lid. And the insulating member that covers the elastic member are elastically deformed while keeping the gap between the battery lid and the flange portion constant because the rod-shaped member has rigidity against the pressing force. And the liquid-tightness can be maintained, and the rod-shaped member is covered by the insulating member so as to be electrically insulated from at least one of the thin portion and the battery lid. Insulation from the poles is secured. Further, if a plurality of spacing members are provided, the plurality of spacing members hold the spacing between the battery lid and the flange portion at a constant interval, so that the elastic member is elastically deformed uniformly and liquid tightness is further improved. Can be increased. Further, if the material of the insulating member is polypropylene,
Since polypropylene has excellent corrosion resistance against an electrolytic solution and has appropriate flexibility, it is possible to maintain electrical insulation and to easily cover the insulating member. Also,
If the thin portion is an annular groove formed on the inner circumference side from the vicinity of the outer periphery of the pole pillar, and the annular groove is divided into a plurality of partitions by the partition that maintains the strength of the pole pillar, the diameter of the annular groove can be increased. In addition, the volume to be removed can be increased, the weight of the wound secondary battery can be reduced, and the partition can maintain the strength of the pole. If an insulating sheet for insulating between the battery lid and the pole is further provided, the battery lid and the pole are further insulated by the insulating sheet.
High electrical insulation can be ensured.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) Hereinafter, a first embodiment in which the wound secondary battery according to the present invention is applied to a vehicle-mounted lithium-ion secondary battery (hereinafter referred to as a lithium battery). Will be described.

[Structure] As shown in FIG. 1, a lithium battery 1
0 is made of stainless steel (SUS304) and has a cylindrical battery container 16. A cylindrical shaft core 14 made of polypropylene (PP) or polyethylene (PE) having an outer diameter of 16 mm, an inner diameter of 14 mm, and a length of 360 mm is arranged at the center of the battery container 16. Around this shaft core 14,
A winding group 12 in which a strip-shaped positive electrode plate and a negative electrode plate are wound in a spiral shape in cross section with a separator interposed therebetween is arranged.

As shown in FIG. 2, the positive electrode plate 12A is a positive electrode current collector 12Aa made of an aluminum foil having a thickness of 20 μm.
And a positive electrode active material layer 12Ab applied to both surfaces of the positive electrode current collector 12Aa. Positive electrode active material layer 12A
b is a slurry obtained by dispersing lithium cobalt oxide (LiCoO ₂ ), amorphous carbon and polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidone (NMP), and using the slurry on both sides of the positive electrode current collector 12Aa. Applied evenly on the surface and dried, then compression molded with a roll press machine to a length of 6900 m
m, width 340 mm + uncoated part 40 mm, thickness 174 μm
It is what

On the other hand, the negative electrode plate 12B includes a negative electrode current collector 12Ba made of copper foil having a thickness of 10 μm, and the negative electrode current collector 12B.
And a negative electrode active material layer 12Bb applied on both sides of Ba. For the negative electrode active material layer 12Bb, a slurry obtained by dispersing graphite and PVDF in NMP was used.
It is evenly applied to both sides of 2Ba, dried, and then compression molded with a roll press machine to a length of 7,000 mm and a width of 350 mm.
+ The uncoated portion is 40 mm and the thickness is 174 μm.

The separator 12C is made of a microporous PE film having a thickness of 41 μm, and has a length of 7700 mm and a width of 359 mm, which is larger than both electrode plates in order to avoid contact between the positive electrode plate 12A and the negative electrode plate 12B. ing.

A positive electrode lead 30 extends from the positive electrode plate 12A. The positive electrode lead 30 is used for the positive electrode current collector 12A.
The slurry-unapplied portion of a is cut into strips having a width of 10 mm, a length of 35 mm, and a pitch of 40 mm, and bundled. Further, as shown in FIG. 1, the negative electrode lead 42 extends from the negative electrode plate 12B as well as the positive electrode plate 12A.

As shown in FIG. 2, the end of the battery container 16 is sealed by a disk-shaped battery lid 18 made of stainless steel. A circular hole is formed in the center of the battery lid 18. Three fixing pins 34 made of stainless steel protruding in the winding group 12 direction are erected from the inner wall side of the same circle substantially in the middle between the peripheral edge of the circular hole of the battery lid 18 and the outer periphery of the battery lid 18. These fixing pins 34 have a columnar shape with a two-step structure having a small diameter portion and a large diameter portion, and the tip end surface of the small diameter portion is welded to the inner wall of the battery lid 18 by laser welding.
The large diameter portion of the fixing pin 34 is made of PP having electrical insulation and elasticity and is covered with an insulating tube 36 as a cylindrical insulating member. The tip of the insulating tube 36 on the side opposite to the battery lid 18 is formed into a spherical surface, and the conical surface for cutting the spherical surface has a diameter larger than the outer diameter of the insulating tube 36.

The lithium battery 10 also includes a battery container 16
Inside, a positive electrode pole column 20 made of aluminum and having a substantially coma shape is provided. The positive electrode pole 20 has a disk portion having a diameter slightly smaller than the inner diameter of the battery container 16. As shown in FIG. 3, an annular groove 20A as a thin-walled portion is formed in the disc portion from the vicinity of the outer periphery to the inner peripheral side so as to lighten the disc portion. It is divided into three recesses by a partition 20C for giving strength. Further, press-fitting holes 20D are formed in these depressions, respectively, and as shown in FIG. 2, the large-diameter portion of the fixing pin 34 covered with the insulating tube 36 in the press-fitting holes 20D is from the battery lid 18 side. It is press-fitted and fixed to the positive pole 20 by the conical surface of the insulating tube 36. A cylindrical protrusion is formed in the center of the disk portion of the positive electrode pole 20 in the winding group 12 direction, and the protrusion is inserted into the inner diameter of the shaft core 14. Further, a cylindrical portion having the same diameter as the protruding portion is formed on the disk portion so as to protrude from the side opposite to the protruding portion in the circular hole direction of the battery lid 18 to serve as an external terminal. The positive pole 20 has a screw hole 20.
B is formed so that a bus bar fixing screw (not shown) can be screwed on. The end face of the cylindrical portion is the battery lid 1.
The size of each member is determined so as to be flush with the outer wall surface of No. 8.

A ceramic insulating ring 26 and a rubber (E) are provided between the flange portion of the positive electrode pole 20 and the battery lid 18.
O ring 2 made of PDM) as an elastic member having elasticity
8 are intervening. Further, between the positive electrode pole 20 and the battery lid 18, as shown in FIG.
An insulating tape 44, which serves as a circular insulating sheet that insulates the sheet 8 from the sheet 8, is interposed. In addition, the insulating tape 44 is inserted through the insulating tape 44 through the central hole 44A through which the cylindrical portion of the positive electrode pole 20 and the insulating ring 26 are inserted and through the fixing pin 34 covered with the insulating tube 36. The hole 44B is formed.

Further, as shown in FIG. 2, the tip end portions of the bundled positive electrode leads 30 are welded to the peripheral portion of the positive electrode pole 20 by ultrasonic welding with a holding metal fitting (not shown) interposed therebetween. An insulating film (not shown) is arranged on the inner diameter side of the battery case 16 so that the peripheral edges of the winding group 12, the positive electrode lead 30, and the positive electrode pole 20 do not come into direct contact with the battery case 16. The negative electrode side has the same structure as the positive electrode side, and the material of the negative electrode pole 48 (see FIG. 1) is pure copper. Further, the lithium battery 10 includes a cleavage valve (not shown) that cleaves to reduce the internal pressure of the battery when the internal pressure of the battery rises above a predetermined pressure during overcharging due to, for example, a failure of the charger, The cleaving valve is arranged at a position where it does not interfere with the insulating tube 36.

[Manufacturing Method] First, the slurry uncoated portions of the positive electrode current collector 12Aa and the negative electrode current collector 12Ba are cut into strips to form the positive electrode lead 30 and the negative electrode lead 42, and the positive electrode plate 12A and the negative electrode plate 12B. Are spirally wound around the shaft core 14 via the separator 12C so that they do not come into contact with each other. By this winding, the positive electrode lead 30 and the negative electrode lead 4
2 is wound so that each lead gathers. Next, after bundling the positive electrode leads 30 into a lead group, the core 14
The protrusion of the positive electrode pole 20 is inserted into the inner diameter of, and the tip of the lead group is ultrasonically welded to the peripheral edge of the positive pole 20. An insulating film (not shown) is wound around the winding group 12 and the positive electrode pole 20 and inserted into the battery container 16.

Next, an insulating ring 26 and an O ring 28 are further provided between the flange portion of the positive electrode pole 20 and the battery lid 18, and further,
The insulating tape 44 is interposed between the positive electrode pole 20 and the battery lid 18, and the central hole 44A and the insulating tube insertion hole 44B formed in the insulating tape 44 are respectively inserted into the positive electrode pole 20.
Of the insulating tube 26, the fixing pin 34 covered with the insulating tube 34 is inserted, the tip of the insulating tube 36 is positioned at the position of the press-fitting hole 20D, and the battery lid 18 is pressed to connect the battery container 16 to the battery container 16. The boundary with the battery lid 18 is welded by laser welding. The same applies to the negative electrode side, which is not described.

In addition, ethylene carbonate (EC), dimethyl carbonate (DMC),
A non-aqueous electrolyte solution (organic electrolyte solution) in which lithium hexafluorophosphate (LiPF ₆ ) was dissolved at a ratio of 1 mol / liter in a mixed solution of diethyl carbonate (DEC) was injected to activate the positive electrode active material and the negative electrode active material. Fill between the substances and seal the injection port. Then, the lithium battery 10 is completed by charging for a predetermined time with a predetermined constant voltage and constant current.

(Second Embodiment) Next, a second embodiment in which the winding type secondary battery according to the present invention is applied to an on-vehicle lithium battery will be described. In the present embodiment, the same members as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and only different portions will be described.

As shown in FIG. 4, in the lithium battery 11 of this embodiment, the periphery of the circular hole of the battery lid 18 and the battery lid 18 are arranged.
The cylindrical fixing pin 38, which is made of stainless steel and protrudes in the winding group 12 direction from the inner wall side of the same circle substantially in the middle of the outer periphery of
Individually set up. The fixing pin 38 is made of PP having electrical insulation and elasticity and is covered with an insulating tube 40 as a cylindrical insulating member. The outer diameter of the tip of the insulating tube 40 on the side opposite to the battery lid 18 is reduced, and the reduced tip of the insulating tube 40 can be press-fitted into the press-fitting hole 20D. The outer diameter end surface of the abutment portion abuts on the depressed portion.

To manufacture the lithium battery 11, the ends of the fixing pin 38 and the insulating tube 40 are positioned so that they can be press-fitted into the press-fitting hole 20D formed in the recess, and
While pressing the lid 18 with a pressing force of 40 kg / cm ² , the boundary between the battery container 16 and the lid 18 is welded by laser welding. In this embodiment, since the pressing force is smaller than that in the first embodiment, the first
An O-ring 29 having a cross-sectional diameter slightly larger than the cross-sectional diameter of the O-ring 28 used in the embodiment was used.

(Operation, etc.) In the lithium batteries 10 and 11 of the above embodiment, the inner wall of the battery lid 18 and the positive electrode pole 2 are provided by the three fixing pins 34 and 38 and the insulating tubes 36 and 40.
The distance from the flange portion of 0 is kept uniform and constant, and the O-rings 28 and 29 form the flange portion of the positive electrode pole 20 and the battery lid 1.
Since it is pressed against the inner wall of 8, the O-rings 28 and 29 are elastically deformed evenly and the power generation element inside the battery container 16 is shielded from the outside air. For this reason, the electrolyte does not leak from the lithium batteries 10 and 11 (liquid tightness can be improved).

In the above embodiment, the O-ring 2 is used.
8, 29, the insulating ring 26, the insulating tubes 36, 40, and the insulating film (not shown) are interposed between the positive electrode pole 2
0, the positive electrode lead 30, the winding group 12, and the battery lid 18 and the battery container 16 are electrically insulated from each other, so that an internal short circuit between the positive electrode pole 20 and the battery lid 18 and the battery container 16 does not occur. .

Further, in the above embodiment, the fixing pin 3
4, 38 and the insulating tubes 36, 40 make the battery lid 18
Since the positive electrode pole column 20 and the shaft core 14 are in direct contact with each other, the O-ring is pressed when the battery lid 18 is pressed and welded to the battery container 16. 28 and 29 are elastically deformed to generate a repulsive force, and the battery lid 18
A pressing force is applied to the positive electrode pole 20, the positive electrode pole 20, and the shaft core 14, and they are fixed in a state of being pressed against each other. Therefore, as in the battery of the conventional example shown in FIG.
Nut 22 for fixing (and the negative pole) and insulating washer 2 for insulating the battery lid 18 and the positive pole 20
It is possible to fix the positive electrode pole without using 4.
In addition, since these fastening members are not provided, the lithium battery 10,
The length of 11 can be shortened. In addition, the nut 22
Since it is not necessary to extend the cylindrical portion of the positive electrode pole 20 from the battery lid 18 to the outside of the battery lid 18 in order to fix the lithium battery 10, the length of the lithium batteries 10 and 11 can be shortened.

Further, since the annular groove 20A is formed in the positive electrode pole 20 from the vicinity of the outer periphery to the inner periphery, the diameter is increased and the volume to be thinned out is increased.
Weight reduction of 0 and 11 can be achieved. Further, the annular groove 2
Since 0A is divided by a partition 20C and the positive electrode pole 20 made of aluminum is made to have strength, the battery lid 18 is formed at the time of manufacturing the battery.
Even if a predetermined pressing force is applied to the positive electrode pole 20, the positive electrode pole column 20 is not damaged, and it is possible to withstand vibration when mounted on a vehicle and gravity acceleration due to rapid acceleration / deceleration.

Further, since the insulating tubes 36 and 40 are made of polypropylene, they are excellent in corrosiveness with respect to the electrolytic solution and can maintain the electrical insulating property, and at the same time, they have appropriate flexibility and can easily be fixed pins 34, The protrusion 38 can be covered, and furthermore, it becomes easy to press-fit into the press-fitting hole 20D.

Furthermore, since the insulating tape 44 is interposed between the battery lid 18 and the positive electrode pole 20, the electrical insulation between these members can be further enhanced. In addition, the above-mentioned effects are the same on the negative electrode side.

(Tests, etc.) Next, the lithium batteries 10 and 1 of the first and second embodiments manufactured as described above are manufactured.
For 1 (hereinafter, referred to as the batteries of Examples 1 and 2), the weight and length were measured and a leak test was performed. In addition, the battery of the conventional example shown in FIG. 5 (hereinafter, referred to as the battery of the comparative example), which was manufactured at the same time to confirm the effect of the battery of the example, is also described.

The measured results of the weight and length of each battery of Examples and Comparative Examples are shown in Table 1 below. As shown in Table 1, the battery of the example was able to be reduced in weight by 90 g or more and the length of the battery could be reduced by 31 mm as compared with the battery of the comparative example. Therefore, it has been found that when a plurality of lithium batteries 10 and 11 are connected and used, a considerable reduction in weight and size can be achieved.

[0034]

[Table 1]

The batteries of Examples and Comparative Examples were vibrated under the conditions shown in Table 2 below, and the presence or absence of leak was confirmed. As a result of this leak test, no electrolyte leakage occurred from the batteries of Examples and Comparative Examples. Therefore, it has been confirmed that even if the miniaturized and lightweight lithium batteries 10 and 11 are mounted on a vehicle, liquid leakage of the electrolytic solution due to vibration or rapid acceleration / deceleration does not occur (liquid tightness is secured).

[0036]

[Table 2]

Therefore, the lithium battery 1 of the above embodiment
In Nos. 0 and 11, the insulation and liquid-tightness of the pole portion are ensured, and the weight and size are reduced.

In the above embodiment, an example in which the winding group 12 formed by winding in a roll shape is inserted into the cylindrical battery container 16 has been described, but the winding group formed by rolling in a roll shape is described. The winding group 12 may be inserted into a polygonal battery container such as a triangular shape or a quadrangular shape.

In the above embodiment, an example in which the present invention is applied to a lithium ion secondary battery has been described.
The present invention can be applied to other battery systems such as an organic electrolyte battery other than a lithium secondary battery, a nickel hydrogen battery, a nickel cadmium battery, and the like.

Further, in the above embodiment, the annular groove 20A is used.
Although the example in which the above is formed on the upper side of the positive electrode pole 20 is shown, it may be formed on the lower side. In addition, the annular groove 20A is the positive electrode pole 2
In order to reduce the weight of the positive electrode pole piece 20, the positive pole piece 20 may be formed in a shape other than the annular groove, such as a square pole or a triangular pole, as long as the strength of the positive electrode pole piece 20 can be maintained.

In the above embodiments, the size, material and shape of each member and the manufacturing method of the lithium batteries 10 and 11 have been described, but the present invention is not limited to these, and the above-mentioned patent claims. It is obvious to those skilled in the art that various other embodiments can be adopted within the scope of.

[0042]

As described above, according to the present invention,
The flange portion and the battery lid are held by the spacing member at a fixed interval in a state where the elastic member is elastically deformed, and the pole and the shaft core are in direct contact with each other, so that the battery lid is pressed by the pressing force. When it is joined to the battery container by
The poles and the shaft core are fixed while being pressed against each other by pressing force, and the poles can be fixed without using a fastening member for fixing the poles to the battery lid. The secondary battery can be miniaturized, and since the pole column is formed with a thinned portion thinned to reduce the weight, the weight of the wound secondary battery can be reduced. The effect can be obtained. Further, since the battery lid and the poles are insulated by the elastic member having electrical insulation and the spacing member that electrically contacts the thin wall portion and the battery lid, Insulation can be maintained, and since the battery lid and the flange portion are held at a predetermined interval in a state where the elastic member is elastically deformed, it is possible to obtain the effect that liquid tightness can be ensured. it can.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a lithium battery according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view near a positive electrode pole of the lithium battery according to the first embodiment.

FIG. 3 is an exploded perspective view near a positive electrode pole of the lithium battery according to the first embodiment.

FIG. 4 is a schematic sectional view of a lithium battery according to a second embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a conventional organic electrolyte secondary battery.

[Explanation of symbols]

10, 11 Lithium battery (wound secondary battery) 12 Winding group 14 Shaft core 16 Battery container 18 Battery lid 20 Positive electrode pole 20A Annular groove (thin portion) 28, 29 O-ring (elastic member) 34, 38 Fixed Pins (bar-shaped members, part of spacing members) 36, 40 Insulation tubes (insulation members, parts of spacing members) 44 Insulation tape (insulation sheet)

Continuation of front page (56) References JP-A-11-339762 (JP, A) JP-A-11-135150 (JP, A) JP-A-9-92237 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) H01M 10/00-10/40 H01M 2/00-2/08 H01M 2/20-2/34

Claims (6)

(57) [Claims] 1. A winding group having an axis is housed in a battery case, and a pole is penetrated through a hole formed in the battery cover from inside the battery case to serve as an external terminal. In a wound secondary battery in which an elastic member having electrical insulation is interposed between a flange portion and a thin-walled portion thinned to reduce the weight of the pole pillar, the pole pillar is formed. An interval holding member that abuts the thin portion and the battery lid with electrical insulation and holds a distance between the flange portion and the battery lid constant in a state where the elastic member is elastically deformed. Comprising, the battery lid is pressed by a pressing force and joined to the battery container, the battery lid and the flange portion are pressed against each other by the pressing force via the elastic member, and the shaft core Direct contact with the poles and press them against each other by the pressing force And which, wound type secondary battery, characterized by being. 2. The spacing member is a rod-shaped member having rigidity with respect to the pressing force, and is configured to electrically insulate the rod-shaped member from at least one of the thin portion and the battery lid. The wound secondary battery according to claim 1, comprising an insulating member that covers the rod-shaped member. 3. The wound secondary battery according to claim 1, further comprising a plurality of the spacing members. 4. The wound secondary battery according to claim 2, wherein the insulating member is made of polypropylene. 5. The thin portion is an annular groove formed on the inner peripheral side from the vicinity of the outer periphery of the pole column, and the annular groove is divided into a plurality of partitions by a partition that maintains the strength of the pole column. The wound secondary battery according to any one of claims 1 to 4. 6. The wound secondary battery according to claim 1, further comprising an insulating sheet that insulates between the battery lid and the pole. .