JP2000021436A - Cylindrical battery - Google Patents

Cylindrical battery

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Publication number
JP2000021436A
JP2000021436A JP18892498A JP18892498A JP2000021436A JP 2000021436 A JP2000021436 A JP 2000021436A JP 18892498 A JP18892498 A JP 18892498A JP 18892498 A JP18892498 A JP 18892498A JP 2000021436 A JP2000021436 A JP 2000021436A
Authority
JP
Japan
Prior art keywords
electrode
positive electrode
negative electrode
cylindrical battery
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP18892498A
Other languages
Japanese (ja)
Inventor
Fumiaki Murakami
Tomoyasu Takeuchi
文章 村上
友康 竹内
Original Assignee
Denso Corp
株式会社デンソー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp, 株式会社デンソー filed Critical Denso Corp
Priority to JP18892498A priority Critical patent/JP2000021436A/en
Publication of JP2000021436A publication Critical patent/JP2000021436A/en
Pending legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation
    • Y02E60/122Lithium-ion batteries

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical battery having high output, high energy density and high productivity. SOLUTION: This cylindrical battery has a rolled electrode formed by cylindrically winding a band-like positive electrode 21, a band-like negative electrode 22, and two band-like separators 23 interposed between both the electrodes 21, 22. Both the electrodes 21, 22 have projecting ends 213, 223 projecting in opposite directions to each other from a longitudinal end of a winding shaft of the separator 23 and resin spacers 24, 25 interposed between each projecting end 213, 223. A tip of each projecting end 213, 223 is projected by just the predetermined length from the resin spacer 24, 25 and is welded to current collecting members 21, 22 through electric welding. Since the projecting ends 213, 223 are connected to the collecting members 31, 42 over the whole width of both the electrodes 21, 22, high output and high energy density is obtained, and productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of cylindrical batteries or wound electrode batteries, and more particularly to the technical field of high-power cylindrical batteries such as lithium batteries having wound electrodes.

[0002]

2. Description of the Related Art In recent years, lithium secondary batteries, which are becoming mainstream as a power source for portable telephones, portable video cameras, and the like, have attracted attention as automotive batteries because of their high energy density. However, when used as an automobile battery, a large output is required to drive the motor, and there is a strong demand for weight reduction for the purpose of improving fuel efficiency and acceleration. Higher output and higher energy density are indispensable for batteries.

In a conventional lithium secondary battery, a current generated in an electrode by a battery reaction is taken out by connecting an electrode and a terminal with a thin metal foil (tab). However, if the number of tabs is small, high current collection efficiency cannot be obtained,
There is a disadvantage that a high output cannot be obtained. On the other hand, it is possible to cope with high output by increasing the number of tabs, but in this case, man-hours are required to connect a large number of tabs to each of the positive and negative electrodes and electrode terminals, and productivity is reduced. This causes the inconvenience.

On the other hand, Japanese Patent Application Laid-Open No. 55-80269 discloses a battery in which a current collecting disk is welded to the end face of a wound electrode. However, in this battery, when the thickness of the electrode is thin or a difficult-to-weld material is used for the material of the electrode, welding between the electrode and the disc becomes difficult, and the productivity of the battery decreases. there were.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a cylindrical battery having a high output, a high energy density, and a high productivity. .

[0006]

(First Means) A first means of the present invention is a cylindrical battery according to the first aspect. That is, the first means of the present invention provides a cylindrical electrode having a wound electrode in which a strip-shaped positive electrode, a strip-shaped negative electrode, and a strip-shaped separator interposed between the positive electrode and the negative electrode are wound in a cylindrical shape. Type battery. The feature of this means is that at least one of the positive electrode and the negative electrode has a projecting end projecting from an end in the winding axis length direction of the separator, and a resin spacer interposed and joined between the projecting ends. And that the protruding end has a leading end at least exposed from the resin spacer, and further has a current collecting member joined to the leading end.

In this means, at least one of the positive electrode and the negative electrode of the wound electrode (referred to as the electrode) has a protruding end, and a resin is provided between the (or these) protruded ends. Spacer is interposed. Further, the tip of the protruding end is at least exposed from the end face of the resin spacer,
Desirably, it protrudes, so that it is easily joined to the current collecting member. Therefore, the electrode of the wound electrode can be joined to the current collecting member at the tip end of the protruding end portion over the entire width of the belt-like shape, so that the current mainly flows in the electrode. And flows along the winding axis length direction to reach the current collecting member in a short distance.

As a result, there is almost no current flowing in the electrode for a long distance in the circumferential direction, so that the internal resistance of the electrode is greatly reduced, the heat generation at the electrode is significantly reduced, and the current collecting member is reduced. The current collection efficiency to the power supply is high. Further, since there is no tab, there is no local heat generation due to the concentration of current near the tab, and only a very small amount of heat is generated in the entire electrode, so that damage due to overheating of the battery is prevented.
Therefore, it is possible to implement a cylindrical battery having a high energy density and a high output.

On the other hand, when a resin spacer is interposed over the entire width of the protruding end of the electrode and joined to the protruding end,
It is relatively easy compared to joining a large number of tabs to the protruding end of the electrode and connecting the current collecting member to the large number of tabs. Therefore, it is possible to ensure relatively high productivity. Therefore, according to this means, there is an effect that a cylindrical battery having not only high output and high energy density but also high productivity can be provided.

[0010] The cylindrical battery of the present invention comprises a wound electrode in which a strip-shaped positive electrode, a strip-shaped negative electrode, and two strip-shaped separators interposed between the positive electrode and the negative electrode are wound in a cylindrical shape. Battery. Therefore, the present means is not particularly limited by the type of battery, and can be used in general wound electrode batteries including lithium secondary batteries. As the positive electrode and the negative electrode, a current collector and an electrode active material provided on the surface of the current collector can be used. At this time, the materials of the current collector and the electrode active material are not particularly limited, and known or new materials can be used. The material of the separator can also be selected according to the type of battery.

(Second Means) A second means of the present invention is a cylindrical battery according to the second aspect. That is, in the cylindrical battery according to the present means, the tip of the protruding end projects from the resin spacer by a predetermined length and is bent to form a joint surface, and the current collecting member is electrically connected to the joint surface. Welded.

[0012] Therefore, in this means, the tip of the protruding end portion corresponding to the entire width of the electrode can be electrically welded to the current collecting member with a predetermined area of the joint surface. With a small connection resistance. In addition, since the process of bending the distal end portion of the protruding end portion and the process of electrically welding the current collecting member to the joint surface of the distal end portion can be performed with a small number of man-hours, high productivity can be secured.

Therefore, according to this means, there is an effect that the effect of the first means can be further enhanced.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described specifically with reference to examples. Embodiment 1 (Structure of Embodiment 1) As shown in FIG. 1, a cylindrical battery according to Embodiment 1 of the present invention is roughly divided into a mandrel 1, a wound electrode 2, a mandrel 1, and a coil. It is composed of current collecting members 41 and 42 for connecting the winding electrode 2 and a case 3 for storing the wound electrode 2 and the current collecting members 41 and 42.

The wound electrode 2 is composed of a strip-shaped positive electrode 21, a strip-shaped negative electrode 22, and two strip-shaped separators 23 respectively interposed between the positive electrode 21 and the negative electrode 22. Is formed by being wound in a cylindrical shape around the periphery. The positive electrode 21 and the negative electrode 22 are respectively connected to the separator 2
3 and projecting ends 213 and 223 projecting in opposite directions from the ends in the winding axis length direction, and resin spacers interposed between the projecting ends 213 and 223 and joined to the projecting ends 213 and 223, respectively. 24 and 25. The protruding ends 213 and 223 of the positive electrode 21 and the negative electrode 22 are
Each tip 21 projecting and exposed from 4, 25
4,224 (see FIG. 3). Then, the current collecting members 41, which are respectively joined to the tip portions 214, 224,
42 are provided.

That is, the tips 214 and 224 of the protruding ends 213 and 223 of the positive electrode 21 and the negative electrode 22 respectively.
Project from each of the resin spacers 24 and 25 by a predetermined length and are bent to form bonding surfaces 215 (see FIG. 4) and 225 (not shown). Then, each of the current collecting members 41 and 42
Are the joining surfaces 215 and 2 of the tip portions 214 and 224, respectively.
25, and the tip portions 214 and 224 are welded to the current collecting members 41 and 42, respectively, to form welded portions F.

More specifically, the cylindrical battery according to the present embodiment is a lithium ion battery having a spirally wound electrode 2, and each part thereof is configured as follows. Core rod 1
Is a cylindrical positive electrode terminal 11 having a protrusion with a thread formed on the outer periphery, a negative electrode terminal 12 having the same shape as the positive electrode terminal portion 11, and a positive terminal 11 and a negative terminal 12. And a connecting pin 13 attached to the hole and integrally connected. The positive terminal 11 and the negative terminal 12 are formed of a conductor so as to function as terminals.
Reference numeral 6 is formed of an electric insulator for insulating both terminals 11 and 12.

As shown in FIGS. 1 and 4, the wound electrode 2 is composed of a positive electrode 21, a negative electrode 22, two separators 23, a resin spacer 24 on the positive electrode side, and a resin spacer 25 on the negative electrode side. . The positive electrode 21 includes a current collector 211 formed of an aluminum foil, and a positive electrode active material layer 212 made of a lithium manganese oxide or the like formed on both sides of the current collector 211 except for the upper edge. The upper edge portion where the active material is not formed is the protruding end portion 213 and has a tip portion 214 protruding from the resin spacer 24 (see FIG. 3).

On the other hand, the negative electrode 22 includes a current collector 221 formed of a copper foil, and a negative electrode active material layer 222 made of carbon or the like formed on both surfaces except the lower edge of the current collector 221. . The lower edge where no active material is formed is the protruding end 223 (see FIG. 1), and has a tip 224 (not shown) protruding from the resin spacer 25. Note that the upper and lower sides in this embodiment are the upper and lower sides in FIG.

The resin spacers 24 and 25 are tape-shaped members formed of an epoxy resin which is a thermosetting resin.
3, 223, and are wound integrally with the protruding ends 213, 223. As a result, the resin spacers 24,
25 forms a disk-shaped resin member as a whole,
Tip portions 21 of projecting end portions 213 and 223 from the resin member
4,224 respectively project spirally.

The two separators 23 are made of a sheet made of polyethylene or polypropylene. As is apparent from FIG.
One separator 23 is laminated on the positive electrode 21, the negative electrode 22 is further thereon, and the other separator 23 is further thereon.
Are laminated to form a four-layer structure. The positive electrode 21 is shifted to one side (upward in FIG. 1) along the winding axis length direction, and the negative electrode 22 is shifted to the other side along the winding axis length direction. The portions 213 and 223 protrude from one end of the negative electrode 22 and the other end of the positive electrode 21, respectively, facing away from each other. Note that the positive electrode active material layer 212 and the negative electrode active material layer 222 are arranged so as to overlap without being shifted from each other. Note that the positive electrode active material layer 212 and the negative electrode active material layer 222 are each impregnated with an appropriate amount of a non-aqueous electrolyte.

The two separators 23 are disposed between the positive electrode active material layer 212 and the negative electrode active material layer 222 to physically separate them. Each separator 23 includes a positive electrode active material layer 212 and a negative electrode active material layer 22.
2 and slightly projecting from four sides of each active material layer. The positive-electrode-side resin spacer 24 is laminated on the outer peripheral surface of the protruding end portion 213 that corresponds to the upper edge of the positive-electrode-side current collector 211. Similarly, the negative-electrode-side resin spacer 25 is laminated on the outer peripheral surface of the protruding end 223 that corresponds to the lower-end edge of the current collector 221 on the negative-electrode side. In this state, the resin spacers 24 and 25 are wound together with the positive electrode 21, the negative electrode 22, and the two separators 23.

The thickness of the resin spacers 24 and 25 is determined by the thickness of one separator 23 and the thickness of one positive electrode active material layer 2.
12 or the thickness of the negative electrode active material layer 222 together. Therefore, the resin spacer 2
Numeral 4 fixes the protruding end 213 of the current collector 211 of the positive electrode 21, and the resin spacer 25 fixes the protruding end 223 of the current collector 221 of the negative electrode 22.

The case 3 comprises a metal tube 31 and two lids 32. An insulating film is formed on the inner peripheral surface of the cylindrical portion 31 and the inner surface of the lid portion 32 to achieve electrical insulation. Each of the two lids 32 has a cylindrical outer peripheral edge and a through hole at the center. The two lids 32 are respectively inserted and fixed into the openings at both ends of the tubular part 31.

The projections of the positive electrode terminal 11 and the negative electrode terminal 12 of the core rod 1 are attached to the two lids 32 through insulating packings 33 in the central through holes. A nut 34 is screwed into each projection with a washer therebetween, and the lids 32 are air-tightly and liquid-tightly fixed. (Manufacturing Method of Embodiment 1) Next, a method of manufacturing the cylindrical battery of this embodiment will be described. The core rod 1 and the case 3 can be easily made by ordinary machining, plastic working, or the like. Therefore, a method of manufacturing the wound electrode 2 will be mainly described here. The method of manufacturing the wound electrode 2 includes a winding step of winding and forming the wound electrode 2, and tips 214 and 224 of the projecting ends 213 and 223 of the wound electrode 2.
And a welding step of electrically welding the current collecting members 41 and 42, respectively.

Prior to the winding step, the following preparations are made. The positive electrode 21 and the negative electrode 22 are respectively coated with a positive electrode active material and a negative electrode active material on both surfaces except for the protruding ends 213 and 223 of the current collectors 211 and 221 by a normal method, respectively. The material layer 222 is formed and manufactured in advance. Also, the separator 23 is prepared by a usual method. Further, resin spacers 24 and 25 are also prepared in advance.

First, in the winding step, a method schematically shown in FIG. 2 is used as a winding method. That is, the apparatus used in this method includes a core rotating unit (not shown) that rotates while holding the core 1, and two pressing rollers R
And a feeder (not shown) for feeding the positive electrode 21, the negative electrode 22, the separator 23, and the resin spacers 24 and 25, respectively.

Each feed section includes a positive electrode 21, a negative electrode 22,
The relative positions of the separator 23 and the resin spacers 24, 25 in the axial direction are adjusted. Further, in each of the feed portions, the positive electrode active material layer 212 of the positive electrode 21 and the negative electrode active material layer 222 of the negative electrode 22 and the two separators 23 are arranged so as to overlap each other. Further, in each feed portion, the resin spacer 24 overlaps the proper position of the protruding end 213 of the positive electrode 21, and the resin spacer 25
3 so as to overlap with the appropriate position.

In this state, the positive electrode 21, the negative electrode 22, the separator 23, and one end of the resin spacers 24, 25 are held by two pressing rollers R on the outer periphery of the core rod 1 held by the core rod rotating unit. Then, the core rod rotating unit is driven to rotate the core rod 1, and the positive electrode 21, the negative electrode 22, the separator 23, and the resin spacers 24 and 25 are formed on the outer peripheral surface of the core rod 1.
Wrap.

At this time, the thickness of the resin spacers 24 and 25 is determined by the respective protruding ends 21 of the positive electrode 21 and the negative electrode 22.
It is precisely controlled to match the winding interval of 3,223. As shown in FIG. 3, the resin spacers 24 and 25 wound integrally with the protruding ends 213 and 223 are helically protruded with the tips 214 and 224 protruding. , 223 are formed.

As described above, the wound electrode 2 can be manufactured by the method using such an apparatus. Next, in the welding process, as shown representatively on the positive electrode side in FIG.
Are electrically welded to the leading ends 214 and 224 of the protruding ends 213 and 223. As a result of the electric welding, the protruding ends 213 and 22
3 are melted to form a weld metal F, and are welded to the current collecting members 41 and 42. At this time, since the resin spacers 24 and 25 exhibit a heat insulating action, heat generated by electric welding is not directly transmitted to the positive electrode active material layer 212 and the negative electrode active material layer 222, and damage due to overheating is prevented. Have been.

As shown in FIG. 5, each of the current collecting members 41 and 42 has a cut C formed radially at an even number from the outer periphery toward the central through hole 40, and the cut C forms petals. It is a flat plate punching member formed with an even number of petals S sectioned in a shape. Each petal S
Electrodes for electric welding are connected in a positive and negative alternation, respectively, and are provided with a predetermined pressing force so that the tips 21
The electric welding is performed while pressing the 4,224. At the time of electric welding, the resin spacers 24 and 25 are formed on the outer peripheral edges between the resin spacers 24 and 25 and the positive electrode active material layer 212 and the negative electrode active material layer 222 so that the protruding ends 213 and 223 do not buckle. , And then fixed, and electric welding is performed.

Of the current collecting members 41 and 42, the current collecting member 41 on the positive electrode 21 side is formed of aluminum so as to be easily welded to the aluminum foil forming the current collector 211 of the positive electrode 21. ing. On the other hand, the current collecting member 42 on the negative electrode 22 side is formed of a copper alloy so as to be easily welded to the copper foil forming the current collector 221 of the negative electrode 22.
Further, as shown in FIG. 1 again, the positive electrode terminal 11 and the negative electrode terminal 12 are inserted and fitted into the central through holes 40 of the current collecting members 41 and 42, respectively, by interference fitting. If necessary, the current collecting members 41 and 42 and the terminals 11 and 12 are connected by welding or metal brazing, respectively, with low connection resistance.

After the above winding step and welding step,
The wound electrode 2 wound around the core rod 1 and the current collecting members 41 and 42 joined to the wound electrode 2 are housed in a case 3 in a closed state together with a non-aqueous electrolyte in a usual manner. The cylindrical battery of the embodiment is manufactured. The method of manufacturing the case 3 is self-evident because the configuration of the case 3 is described in the configuration section, and thus the description is omitted here.

(Operation and Effect of Embodiment 1) Since the cylindrical battery of this embodiment is configured as described above, the following operation and effect are exhibited. In the cylindrical battery according to the present embodiment, the positive electrode 21 and the negative electrode 22 of the wound electrode 2 have projecting ends 213 and 223, respectively, and the wound projecting ends 213 and 223 are wound.
223 are filled and fixed by resin spacers 24 and 25, respectively. Further, the projecting end 21
3 and 223 project from the end faces of the resin spacers 24 and 25, respectively.
1, 42 are easily joined by electric welding.
Therefore, the positive electrode 21 and the negative electrode 22 of the spirally wound electrode 2 have the protruding ends 213 and 2 respectively over the entire width of the band shape.
23 are connected to the current collecting members 41 and 42 at the respective tips 214 and 224. Then, in the positive electrode 21 and the negative electrode 22, the current mainly flows along the winding axis length direction and hardly flows in the circumferential direction, so that the current reaches the current collecting members 41 and 42 at the shortest distance, and the positive electrode terminal 11 and negative electrode terminal 12
Can be reached.

As a result, there is almost no current flowing in the positive electrode 21 and the negative electrode 22 for a long distance in the circumferential direction, so that the internal resistance of the two electrodes 21 and 22 is greatly reduced.
The heat generation at 22 is greatly reduced. Furthermore, both poles 21,
Since the protruding end portions 213 and 223 are welded to the current collecting members 41 and 42 over the entire width of 22, respectively, the connection resistance is small and the connection area is wide, so that the current collecting members 41 and 42 are provided.
The current collection efficiency of the power supply becomes very high. Also, since there is no tab, there is no local heat generation due to the concentration of current near the tab, and the poles 21 and 22 generate very little heat.
Damage due to overheating of the battery is prevented. Therefore, it is possible to implement a cylindrical battery having a high energy density and a high output.

On the other hand, connecting the resin spacers 24 and 25 to the protruding ends 213 and 223 by interposing the resin spacers 24 and 25 over the entire widths of the protruding ends 213 and 223 of the poles 21 and 22 respectively requires a large number of tabs. , 22 protruding end portions 213, 2
23, and the connection between the current collecting members 41 and 42 and a number of tabs is relatively easy. Therefore, it is possible to ensure relatively high productivity.

Therefore, according to the cylindrical battery of this embodiment, not only high output and high energy density can be exhibited, but also high productivity can be exhibited. (Modification 1 of Embodiment 1) As Modification 1 of the present embodiment, as shown in FIGS. 6 and 7 on the positive electrode 21 side, the tips 214 and 224 of the protruding ends 213 and 223, respectively.
Is bent, and a cylindrical battery in which the current collecting members 41 and 42 are electrically welded to each other is possible.

That is, in the cylindrical battery of this modified embodiment,
As shown in FIG. 6, the tips 214 and 224 of the projecting ends 213 and 223 project from the resin spacers 24 and 25 by a predetermined length and are bent to form joining surfaces 215 and 225. Thereafter, as shown in FIG.
1, 42 are electrically welded to the respective joining surfaces 215, 225.

Therefore, in the cylindrical battery of this modified embodiment,
Protruding end portions 213 and 223 corresponding to the entire width of both poles 21 and 22
Can be electrically welded to the current collecting member with a predetermined area of the joint surfaces 215 and 225. As a result, over the entire width of the poles 21 and 22,
With even smaller connection resistance, the protruding ends 213, 22
3 are connected to the current collecting members 41 and 42, respectively.

As shown in FIG. 6, in the bending step of bending the tips 214 and 224 of the protruding ends 213 and 223, after the winding step is completed, the outer periphery of the spirally wound electrode 2 is centrifugally moved in the centripetal direction. Tip part 21
4,224 may be bent. Alternatively, while relatively rotating the wound electrode 2 and the pressing tool, moving the pressing tool in a spiral shape in the centripetal direction of the wound electrode 2, the tip 2
14, 224 may be bent.

The above-mentioned bending step is also performed at each of the tip portions 214 and 2.
24 are provided on the respective joining surfaces 215 and 225.
Since the step of electric welding 1, 42 is also a step that can be performed with a small number of man-hours, high productivity can be ensured. Therefore, according to the cylindrical battery of this modification, the same operation and effect as those of the first embodiment can be obtained.

(Modification 2 of Embodiment 1) As Modification 2 of Embodiment 1, in the winding step of the winding electrode 2 of Embodiment 1 described above, the uncured resin spacers 24 and 25 are connected to both electrodes 2.
By taking a means for winding while applying a proper thickness to the surfaces of the protruding ends 213 and 223 of the projections 1 and 22, a cylindrical battery having the same configuration as that of the first embodiment can be manufactured.

In this modification, the uncured resin spacer 2
4 and 25 are applied directly from the dispenser to the protruding ends 213 and 223, respectively.
There is no need to wind the tape 5 into a tape shape, and there is no possibility that the tape-shaped resin spacers 24 and 25 will break during the winding. As a result, the reliability in the winding process increases,
The cylindrical battery of Example 1 can be manufactured at a higher yield.

(Third Modification of First Embodiment) As a third modification of the first embodiment, the winding electrode 2 is wound without winding the resin spacers 24 and 25 simultaneously with the winding of the winding electrode 2 in the winding step.
It is possible to implement a cylindrical battery produced by a manufacturing method in which a resin is buried between the protruding ends 213 and 223 after winding.

That is, after the wound electrode 2 is formed, a method of applying the uncured resin from the end surface of the wound electrode 2 with a brush or a roller, or applying the uncured resin by spray coating from the end surface of the wound electrode 2 Manufacturing method can be taken. Further, the positive electrode terminal 11 and the negative electrode terminal portion 12 of the mandrel 1 protruding from the wound electrode 2 are eliminated, and the current collecting members 41 and 42 are used as terminals, so that the end of the wound electrode 2 is a jelly-like uncured end. The resin spacers 24 and 25 can also be formed by pressing against resin. Alternatively, the resin spacers 24 and 25 can be similarly formed by pressing against the slurry-like uncured resin.

It should be noted that even if the tips 214 and 224 of the projecting ends 213 and 223 do not protrude from the resin spacers 24 and 25, the projecting ends 213 and 213 can be obtained simply by exposing the tips of the tips 214 and 224. 223 and current collecting members 41 and 4
2 is possible. In extreme terms, the projecting end 21
Even if the tip surface of 3,223 is covered with a very thin resin layer, if a high voltage is applied and electric welding is performed, the very thin resin layer will break down, and the protruding ends 213,223 and the current collecting member Connection with 41 and 42 is possible.

According to this modification, the resin spacers 24,
Since the formation of 25 is easy, there is an effect that a cylindrical battery can be provided at lower cost in addition to the effect of the first embodiment. (Modification 4 of Example 1) As Modification 4 of Example 1, PP (polypropylene), PE (polyethylene) is used as the resin forming the resin spacers 24 and 25 instead of a thermosetting resin such as an epoxy resin. , PPS, or 6-
It is possible to implement a cylindrical battery employing a thermoplastic resin such as 6 nylon. According to this modification, an effect similar to the effect of the first embodiment can be obtained.

[Brief description of the drawings]

FIG. 1 is a half cross-sectional view showing the overall configuration of a cylindrical battery as Example 1.

FIG. 2 is a perspective view showing a method of manufacturing a wound electrode of the cylindrical battery of Example 1.

FIG. 3 is a cross-sectional view illustrating a configuration of an end portion of a wound electrode in a manufacturing process according to the first embodiment.

FIG. 4 is a cross-sectional view showing a configuration near a wound electrode end of the cylindrical battery of Example 1.

FIG. 5 is a plan view showing the shape of a current collecting member of the cylindrical battery according to the first embodiment.

FIG. 6 is a cross-sectional view showing an end of a spirally wound electrode in a manufacturing process of Modification 1.

FIG. 7 is a cross-sectional view showing a configuration in the vicinity of an end of a wound electrode according to a first modification;

[Explanation of symbols]

1: Core rod 11: Positive electrode terminal 12: Negative electrode terminal 13: Connecting pin 2: Wound electrode 21: Positive electrode 211: Current collector 212: Positive electrode active material layer 213:
Projecting end 214: Tip 215: Bonding surface 22: Negative electrode 221: Current collector 222: Negative electrode active material layer 223:
Projecting end 224: Tip 225: Joining surface 23: Separator 24, 25: Resin spacer 3: Battery case 31: Tubular part 32: Lid part 33: Insulation packing
34: Nut 41, 42: Current collecting member 40: Through hole F: Welding part R: Roller C: Cut S: Petal part

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (2)

[Claims]
1. A strip-shaped positive electrode, a strip-shaped negative electrode, and a strip-shaped separator interposed between the positive electrode and the negative electrode, respectively.
In a cylindrical battery having a wound electrode wound in a cylindrical shape, at least one of the positive electrode and the negative electrode has a protruding end protruding from an end in a winding axis length direction of the separator,
A resin spacer interposed between the protruding ends, the protruding end having a tip end at least exposed from the resin spacer, and further comprising a current collecting member joined to the tip end. A cylindrical battery.
2. The method according to claim 2, wherein the tip of the projecting end projects from the resin spacer by a predetermined length and is bent to form a joint surface, and the current collecting member is electrically welded to the joint surface. The cylindrical battery according to claim 1.
JP18892498A 1998-07-03 1998-07-03 Cylindrical battery Pending JP2000021436A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18892498A JP2000021436A (en) 1998-07-03 1998-07-03 Cylindrical battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18892498A JP2000021436A (en) 1998-07-03 1998-07-03 Cylindrical battery

Publications (1)

Publication Number Publication Date
JP2000021436A true JP2000021436A (en) 2000-01-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2000021436A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000062356A1 (en) * 1999-04-08 2000-10-19 Matsushita Electric Industrial Co., Ltd. Secondary battery
WO2003077332A1 (en) * 2002-03-13 2003-09-18 Sanyo Electric Co., Ltd. Secondary battery
JP2009146867A (en) * 2007-12-18 2009-07-02 Nec Tokin Corp Square battery
WO2009153962A1 (en) * 2008-06-17 2009-12-23 パナソニック株式会社 Secondary cell manufacturing method and secondary cell
JP2011508396A (en) * 2007-12-25 2011-03-10 ビーワイディー カンパニー リミテッド Structure of electrochemical storage battery
JP2011527488A (en) * 2008-07-10 2011-10-27 ビーエイケイ・エレクトロニック(シェンツェン)・カンパニー・リミテッド Connection structure between electrode tab and cover plate
US8187743B2 (en) * 2005-03-09 2012-05-29 Samsung Sdi Co., Ltd. Cylindrical type secondary battery with upper and lower battery assemblies and fabrication method thereof
JP2015082499A (en) * 2013-10-23 2015-04-27 三星エスディアイ株式会社Samsung SDI Co.,Ltd. Secondary battery
US9741996B2 (en) 2007-12-25 2017-08-22 Byd Co. Ltd. Construction of electrochemical storage cell

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WO2000062356A1 (en) * 1999-04-08 2000-10-19 Matsushita Electric Industrial Co., Ltd. Secondary battery
US6818025B1 (en) 1999-04-08 2004-11-16 Matsushita Electric Industrial Co., Ltd. Rechargeable battery having a current collector integrally formed and contacting a current collector plate to form a flat plane
WO2003077332A1 (en) * 2002-03-13 2003-09-18 Sanyo Electric Co., Ltd. Secondary battery
US7273678B2 (en) 2002-03-13 2007-09-25 Sanyo Electric Co., Ltd. Secondary cell
US9105890B2 (en) 2005-03-09 2015-08-11 Samsung Sdi Co., Ltd. Cylindrical type secondary battery with upper and lower battery assemblies and fabrication method thereof
US8187743B2 (en) * 2005-03-09 2012-05-29 Samsung Sdi Co., Ltd. Cylindrical type secondary battery with upper and lower battery assemblies and fabrication method thereof
JP2009146867A (en) * 2007-12-18 2009-07-02 Nec Tokin Corp Square battery
US10381632B2 (en) 2007-12-25 2019-08-13 Shenzhen Byd Auto R&D Company Limited Construction of electrochemical storage cell with conductive bridge
JP2011508396A (en) * 2007-12-25 2011-03-10 ビーワイディー カンパニー リミテッド Structure of electrochemical storage battery
US9741996B2 (en) 2007-12-25 2017-08-22 Byd Co. Ltd. Construction of electrochemical storage cell
US10147930B2 (en) 2007-12-25 2018-12-04 Shenzhen Byd Auto R&D Company Limited Construction of electrochemical storage cell with conductive block
WO2009153962A1 (en) * 2008-06-17 2009-12-23 パナソニック株式会社 Secondary cell manufacturing method and secondary cell
JP2011527488A (en) * 2008-07-10 2011-10-27 ビーエイケイ・エレクトロニック(シェンツェン)・カンパニー・リミテッド Connection structure between electrode tab and cover plate
JP2015082499A (en) * 2013-10-23 2015-04-27 三星エスディアイ株式会社Samsung SDI Co.,Ltd. Secondary battery

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