JP2002373640A - Comb-type divider and manufacturing method of battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a divider, capable of dividing a laminated body formed by laminating sheet-like members into two or more layers. SOLUTION: This comb-type divider comprises a combtooth 11 inserted and retained between one-side end parts of at least two laminated sheet-like members of the laminate formed by laminating sheet-like members and a combtooth holding part 12 for holding the combtooth 11. This comb-type divider can divide the laminate into two or more layers, by inserting and retaining the combtooth between one-side end parts of at least two of the sheet-like members forming the laminate to peel the one-end parts of the sheet-like members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a comb-shaped divider for dividing a laminate having a structure in which sheet-like members are stacked into a plurality of layers, and a method of manufacturing a battery using the comb-shaped divider.

[0002]

2. Description of the Related Art In recent years, various devices have always been required to have high performance. Means for improving the performance of the device include:
There is a reduction in the size and weight of the device. Such high performance is no exception in batteries used for power supplies.

[0003] As a battery with high performance, a battery using a wound electrode body formed by spirally winding an electrode with a thin and high-density electrode is known. This wound electrode body is also useful in its productivity and has been widely used.

Usually, a wound electrode body is composed of a sheet-like positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate and the negative electrode plate are laminated via the separator, and the laminated body is wound. You.

[0005] The wound electrode body has a cross section perpendicular to the direction of the winding axis in the shape of a perfect circle or a circular shape close thereto.
The wound electrode body formed in such a circular shape is sealed in a case having a substantially circular cross-sectional shape, and becomes a battery.
Since the battery obtained in this manner has a curved outer peripheral surface that substantially matches the wound electrode body, an invalid space is likely to be generated in the outer peripheral surface when the battery is mounted on a device or the like.

Further, as a kind of the wound electrode body, there is known a flat wound electrode body in which the wound electrode body is compressed in a radial direction to be flattened. This flat-shaped wound electrode body is known as an electrode body having a high volume density because the wound electrode body is compressed. The flat wound electrode body can use a rectangular case when forming a battery, and thus has an effect that an ineffective space hardly occurs in the outer peripheral surface of the battery.

In a battery using a flat wound electrode body, power is usually taken out of the electrode body by directly joining electrode terminals to each of a positive electrode plate and a negative electrode plate. FIGS. 12 and 13 show a state in which electrode terminals are joined to a flat wound electrode body in a conventional battery.

More specifically, at each of the axial ends of the flat spirally wound electrode body 2, each protruding end portion composed of the uncoated portions 32 and 42 of the positive electrode plate 3 and the negative electrode plate 4 on which the electrode active material is not applied. 33 and 43 are formed, and the electrode terminals 6 are joined to the outer peripheral surfaces of the protruding ends 33 and 43 in a state of extending in a direction perpendicular to the axial direction by means such as ultrasonic joining.

The conventional flat wound electrode battery in which the electrode terminals 6 are joined to the respective protruding ends 33 and 43 is the same as the conventional protruding end formed at both axial ends of the flat wound electrode body 2. 3
The electrode terminals 6 were joined to the uncoated portions 32 and 42 in which the joining portions 61 of the electrode terminals 6 were circumscribed or inscribed on the portions 3 and 43 and were laminated in the thickness direction of the flat wound electrode body 2. For this reason, in the conventional flat wound electrode battery, in order to secure the joining margin for joining the electrode terminal 6 and the flat wound electrode body 2, the length of the uncoated portions 32 and 42 is reduced. I needed to take it big. Therefore, the uncoated portions 32, 42
, The lengths of the protruding ends 33 and 43 are increased, and the size of the flat wound electrode body and, consequently, the size of the battery are increased.

In other words, for the purpose of reducing the size of the battery, a joining structure for reducing the joining portion between the electrode body and the electrode terminal is required, and a substantially plate-like electrode terminal is provided on the end face of each protruding end of the electrode body. Joining structures for joining have been devised.

However, in such a bonding structure, in order to reduce the bonding portion of the electrode body with the electrode terminal, the laminate composed of the uncoated portion forming the protruding end is divided into a plurality of layers. However, it was difficult to collect uncoated portions forming the laminate in a bondable state.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a divider which can divide a laminate formed by laminating sheet members into a plurality of layers.

[0013]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have repeatedly studied a splitter for a laminate, and as a result, a splitter having comb teeth inserted into the inside of the laminate is obtained. Thus, it has been found that the above problem can be solved.

That is, the comb-type divider according to the present invention is characterized in that at least two of the laminated members formed by laminating the sheet members are laminated.
It has a comb tooth inserted and held between one end portions of two sheet-like members for peeling off at least two sheet-like members, and a comb tooth holding portion for holding the comb teeth.

In the comb type divider according to the present invention, the comb teeth are inserted and held between at least two end portions of the sheet-like members forming the laminate, and the one end portion of the sheet-like member is peeled off. Thereby, the laminate can be divided into a plurality of layers.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION (Comb Type Divider) A comb type divider according to the present invention is inserted and held between one end portions of at least two laminated sheet members formed by laminating sheet members. And a comb tooth holding section for holding the comb teeth. That is, the comb-type divider of the present invention is a comb-shaped divider that separates the laminated body by separating at least two sheet-like members by being inserted and held between one end portions of at least two sheet-like members. With this, the laminate can be divided into a plurality of layers.

It is preferable to have a plurality of comb teeth.
That is, by having a plurality of comb teeth, the laminate can be divided into three or more layers.

Preferably, the plurality of comb teeth are held in a state of being stacked in the thickness direction of the stacked body. That is, by holding the laminated body in a state of being laminated in the thickness direction, a plurality of comb teeth can simultaneously divide the laminated body into a plurality of layers.

It is preferable that the plurality of comb teeth are held by the comb holding section in such a manner that each of the comb teeth can move in the thickness direction of the laminate. That is, since each of the plurality of comb teeth is held in the movable comb holding portion in a movable state, when inserting the comb teeth of the comb type divider into the laminate to divide the laminate, The phase of the comb teeth changes, and the comb teeth can be easily inserted between the sheet-like members. It should be noted that the number of peeled sheet-shaped members of the laminate can be adjusted by adjusting the intervals between the plurality of comb teeth.

The comb teeth are substantially rod-shaped divided parts arranged substantially in parallel with the end face of the laminate when inserted between the one end parts of the sheet-like member, and a comb tooth holding part formed integrally with the divided parts. And a base end held at the end. That is, since the comb teeth consist of the divided portion and the base end portion, when the comb teeth are inserted between the sheet-shaped members, the divided portion peels off at least two sheet-shaped members, and the laminated body is removed. Can be split. In addition, since the division portion is arranged substantially parallel to the end face of the laminate, the length of the divided portion of the laminate divided into a plurality of layers becomes a fixed length, and the processing of the divided laminate is performed. Sometimes uniform processing can be performed.

It is preferable that the divided portion is formed such that an inner side located on the inner side of the laminate when the comb teeth are inserted between at least two sheet-like members is formed to have a substantially acute angle. Here, the axial direction indicates a direction in which the substantially rod-shaped divided portion extends. That is, since the inner side portion of the divided portion is formed to have a substantially acute angle, the comb teeth can be easily inserted between at least two laminated sheet-like members, and the laminate can be easily divided into a plurality of layers. .

It is preferable that the divided portion is formed such that the width in the thickness direction of the laminated body gradually increases from the substantially bar-shaped distal end toward the proximal end. That is, since the division portion has a tip portion that gradually widens, the comb teeth can be easily inserted between the sheet members, and the laminate can be easily divided into a plurality of layers.

The comb teeth are preferably made of a heat conductive material. The thermal conductive material forming the comb teeth is a member having a thermal conductivity lower than that of at least the sheet-like member. That is, since the comb teeth are made of a heat conductive material, it is possible to perform a process of applying thermal energy in a state where the comb teeth are inserted and held inside the laminate. More specifically, since the comb teeth are made of a heat conductive material, even if heat energy is applied to the end of the laminate divided into a plurality of layers by the comb-type distributor of the present invention, the heat energy is transmitted to the comb teeth. As a result, conduction of heat energy into the inside of the laminate can be suppressed. As a result, it is possible to prevent the heat energy applied during processing from damaging the sheet-shaped member.

It is preferable that the comb tooth holder has a cooler for cooling the comb teeth. That is, by providing the cooler for cooling the comb teeth, when performing the processing for applying thermal energy to the laminate, the heat conducted to the comb teeth can be cooled, and continuous processing can be performed. In addition, since the cooler is provided in the comb holding portion, when a plurality of combs are held, a change in the phase of each comb is prevented.

When the comb teeth are inserted between the sheet-like members, a pair of pressing members for compressing, in the thickness direction, one end where the comb teeth are inserted and held with the laminated body interposed between the sheet members. It is preferred to have. That is, by having a pair of pressing members, not only can the laminated body divided into many layers by the comb teeth be compressed in the thickness direction, but also the gap generated between the sheet-like members due to the insertion of the comb teeth can be reduced. Can be resolved.

The pressing member is preferably made of a heat conductive material. That is, since the pressing member is made of a heat conductive material,
When performing a process of applying heat energy to the laminate, it is possible to apply heat energy in a state where the comb-type distributor is arranged, and to conduct the heat energy to the inside of the laminate through the sheet-shaped member. Can be suppressed.

The comb-type divider of the present invention is preferably used when joining an electrode terminal to an electrode body having a structure in which a sheet-like electrode plate of a battery is laminated.

The comb type divider according to the present invention is inserted and held between at least two sheet-like members having comb teeth laminated thereon,
By peeling off at least two sheet-like members, a laminate formed by laminating the sheet-like members can be divided into a plurality of layers.

(Battery Manufacturing Method) The battery manufacturing method of the present invention comprises a current collector and an electrode active material coated on both surfaces of the current collector, and an electrode portion coated with the electrode active material. An uncoated portion formed on one end side in the width direction of the current collector and exposing the surface of the current collector, and a strip-shaped positive electrode plate and a negative electrode plate, and a strip-shaped separator; And an electrode body having a protruding end in which the uncoated portions protrude in opposite directions to each other and the electrode portions are arranged with the separator interposed therebetween, and the uncoated portions are laminated, and a substantially plate-shaped joint portion An electrode terminal having: a comb tooth that is inserted between uncoated portions of at least two current collectors disposed adjacent to the protruding end and divides the protruding end into a plurality of layers in the stacking direction; Using a comb-type divider having a comb-tooth holding portion for holding comb teeth,
A method for manufacturing a battery, comprising: an electrode terminal joining step of joining an electrode terminal to an end face of a protruding end, wherein the electrode terminal joining step is such that the comb teeth of the comb type divider are inserted and held between the uncoated portions. In a state where the portion is divided into a plurality of layers and the end surface of the protruding end protrudes from the comb teeth, the joining portion of the electrode terminal is brought into contact with the end surface of the protruding end portion, and the joining portion and the electrode terminal are welded. It is characterized by the following.

According to the method of manufacturing a battery of the present invention, the protruding end portion of the electrode body is divided into a plurality of layers using a comb type divider.
By having the electrode terminal joining step of joining the electrode terminal to the protruding end, there is an effect that a battery in which the axial length of the electrode body is shortened can be manufactured. Specifically, since the electrode terminals are joined in a state where the protruding end is divided into a plurality of layers, the length of the uncoated portion required for joining the electrode terminals can be reduced, and the axial length of the manufactured battery can be reduced. And the size of the battery is reduced. Note that the lamination direction indicates the thickness direction of the laminate.

The strip-shaped positive and negative plates are provided with a current collector,
An electrode active material coated on both sides of the current collector, and an electrode portion coated with the electrode active material, and formed on one end of the current collector in the width direction to expose the surface of the current collector The type and manufacturing method are not particularly limited as long as the electrode plate has an uncoated portion.

Examples of the method for producing the strip-shaped positive electrode plate and the negative electrode plate include a production method in which a paste in which an electrode active material is dispersed is prepared, and this paste is applied to the surface of a current collector and dried. Further, in this manufacturing method, it is preferable that the electrode active material portion is compressed after the paste is applied to the current collector and dried.

The comb divider preferably has a plurality of comb teeth. That is, since the comb type divider has a plurality of comb teeth, the protruding end portion can be divided into three or more layers, and the length of the uncoated portion can be shortened. As a result, the size of the battery manufactured by the manufacturing method of the present invention is prevented from becoming coarse.

Preferably, the plurality of comb teeth are held in such a manner that each of the comb teeth can move in the laminating direction of the protruding end. That is, since the plurality of comb teeth are held in a movable state respectively, when the comb teeth are inserted between the current collectors at the protruding end to divide the protruding end into a plurality of layers, the comb tooth is inserted. The phase of the protruding ends of the teeth in the thickness direction in which they are stacked is changed, and the teeth are easily inserted between the current collectors.

The comb teeth are formed in a substantially rod-shaped divided portion which is arranged substantially parallel to the end face of the protruding end portion when inserted and held between the current collectors, and formed integrally with the divided portion in the comb tooth holding portion. And a base end to be held. That is, since the comb teeth are formed of the divided portion and the base end portion, when the comb teeth are inserted between the current collectors, the divided portion pushes the gap between the current collectors. Can be divided into layers.

The divided portion has a cross section perpendicular to the axial direction, and an inner side located inside the electrode body when the comb teeth are inserted between at least two current collectors has a substantially acute angle. Is preferably formed. That is, since the cross-sectional shape of the dividing portion is formed in a shape in which the inner side portion is formed at a substantially acute angle, when the comb teeth of the comb type divider are inserted into the protruding end portion, between the current collectors The comb teeth can be easily inserted, and the protruding end body can be divided into a plurality of layers.

It is preferable that the divided portion is formed such that the width in the thickness direction of the protruding end portion gradually increases toward the base end side of the substantially bar-shaped distal end portion. In other words, since the dividing portion has a tip portion whose width gradually increases, comb teeth can be easily inserted between the sheet-like members, and the laminate can be divided into a plurality of layers.

The comb teeth are preferably made of a heat conductive material. That is, since the welding between the electrode terminal and the protruding end is performed in a state where the comb teeth of the comb type divider are inserted into the protruding end, the thermal energy imparted at the time of welding is provided by the comb teeth being made of a heat conductive material. Is transmitted from the current collector to the comb teeth, and the electrode active material is prevented from being overheated and damaged.

Preferably, the comb tooth holder has a cooler for cooling the comb teeth. That is, by having the cooler, the heat conducted to the comb teeth during welding can be cooled, and the electrode active material of the electrode body is prevented from being damaged by the heat. In addition, by cooling the comb teeth with a cooler,
Since heat does not accumulate in the comb teeth, continuous processing can be performed.

With the comb teeth inserted between the uncoated portions of the protruding ends, the electrode terminals are joined to the protruding ends while the protruding ends are compressed in the thickness direction by a pair of pressing members. Is preferred. That is, by compressing the protruding end portion by the pair of pressing members, the uncoated portion and the comb teeth are brought into close contact with each other, and the heat during welding is efficiently transmitted to the comb teeth. Further, by compressing the protruding end portion by a pair of pressing members, a protruding end portion divided into multiple layers is formed in a state where the laminated uncoated portions are in close contact with each other. The length of the part can be shortened,
It is possible to prevent the physical size of the manufactured battery from becoming coarse.

The pressing member is preferably made of a heat conductive material. That is, since the pressing member is made of a heat conductive material,
Since the heat applied during welding can be released not only to the comb teeth but also to the pressing member, damage due to overheating of the electrode active material of the electrode body can be suppressed.

The electrode body is a flat wound electrode body in which the positive electrode plate, the negative electrode plate, and the separator have a strip shape, and the positive electrode plate and the negative electrode plate are wound in a flat shape via the separator. Is preferred. That is, since the flat wound electrode body has excellent volume efficiency, a high-performance battery having excellent volume efficiency can be obtained when the battery is formed. here,
A flat wound electrode body is a wound electrode body having a circular cross section in which a positive electrode plate and a negative electrode plate are wound via a separator, and an electrode body compressed in a direction perpendicular to the axial direction, or And an electrode body wound in a race track shape on a flat core.

The positive electrode plate, the negative electrode plate, the separator and the electrode terminals used in the method for manufacturing a battery of the present invention are not particularly limited as long as they can form a protruding end having a structure in which uncoated portions are laminated. Absent.

In the method of manufacturing a battery according to the present invention, the protruding end portion of the electrode body is divided into a plurality of layers using a comb type divider.
By having the electrode terminal joining step of joining the electrode terminal to the protruding end, there is an effect that a battery in which the axial length of the electrode body is shortened can be manufactured. Specifically, since the electrode terminals are joined in a state where the protruding end is divided into a plurality of layers, the length of the uncoated portion required for joining the electrode terminals can be reduced, and the axial length of the manufactured battery can be reduced. And the size of the battery is reduced.

[0045]

The present invention will be described below with reference to examples.

(Example) As an example of the present invention, a comb-shaped divider was manufactured, and an electrode terminal was welded to a flat wound electrode body using the comb-shaped divider.

(Comb Type Divider) The comb type divider 1 has five comb teeth 11 and a comb holding portion 1 for holding the comb teeth 11.
2 and a cooler 13 provided in the comb holding portion 12 for cooling the comb. This comb type divider 1 is shown in FIG.

As shown in FIG. 2, the comb teeth 11 are made of copper, and the base end 112 held by the comb tooth holding section 12 and the dividing section 111 inserted into the protruding end of the electrode body are mutually separated. It has a substantially crank shape protruding in the opposite direction. Also,
The comb teeth 11 are formed in a substantially pentagonal cross-sectional shape in which a side portion on the lower surface side of the divided portion 111 is formed in a substantially acute angle shape.
Further, the tip of the divided portion 111 of the comb tooth 11 is formed in a substantially acute angle shape. Comb teeth 11 are shown in FIGS. Note that FIG. 3 is a cross-sectional view so that the cross section of the divided portion 111 of the comb tooth 11 can be seen.

The comb teeth holding section 12 is a member for holding each of the five comb teeth 11 so as to be movable in the thickness direction of the protruding end into which the comb teeth 11 are inserted.

The cooler 13 is a device that is provided in the comb holding section 12 and cools the comb teeth 11 through the comb holding section 12. The cooler 13 is connected to a constant temperature circulating cooling device 15 by a circulating pipe 14. The constant temperature circulating cooling device 15 is a device that supplies a refrigerant to the cooler 13 via a circulating pipe 14. That is, the circulation pipe 14
The cooling medium supplied to the cooler 13 cools the comb teeth 11 via the cooler 13.

(Flat-Type Wound Electrode Body) As shown in FIG. 4, the flat-shaped wound electrode body 2 is interposed between the strip-shaped positive electrode plate 3 and the negative electrode plate 4 and between the two electrode plates 3 and 4. An electrode body formed into a flat shape in a state where the separator 5 is wound. The flat wound electrode body 2 is an electrode body used for a lithium secondary battery.

The positive electrode plate 3 has a positive electrode active material layer 31 formed on both sides of a positive electrode current collector made of a belt-shaped aluminum sheet, and a positive electrode active material layer 31 on one end side in the width direction of the positive electrode current collector. There is an uncoated portion 32 where no 31 is formed. The uncoated portion 32 was formed with a constant width from the end. In addition, a lithium manganese oxide was used as the positive electrode active material.

The negative electrode plate 4 has a negative electrode active material layer 41 formed on both sides of a negative electrode current collector made of a strip-shaped copper sheet, and a negative electrode active material layer on one end side in the width direction of the negative electrode current collector. There is an uncoated portion 42 where the layer 31 is not formed. The uncoated portion 42 was formed with a constant width from the end.
Further, carbon was used as the negative electrode active material.

The separator 5 is made of a belt-shaped microporous polyethylene or polypropylene. That is, the electrode active material layers 31 of the bipolar plates 3 and 4,
The width of the band is longer than the region in which 41 is formed, and the length is longer than the bipolar plates 3 and 4.

The flat-shaped wound electrode body 2 is formed by uncoated portions 32 and 42 of the positive electrode plate 3 and the negative electrode plate 4 projecting from the separator 5 in directions opposite to each other in the axial direction, and being wound into a ring shape. Protruding ends 33 and 43 are formed. Here, FIG. 4 shows a state in which the positive electrode plate 3, the negative electrode plate 4, and the separator 5 constituting the flat wound electrode body 2 are stacked.

The flat wound electrode body 2 was produced by forming a wound electrode body and then compressing it into a flat shape.

More specifically, first, a cylindrical or oval core is used, and the positive electrode plate 3, the negative electrode plate 4, and the separator 5 are wound around the outer peripheral surface of the core. Thereafter, the wound core was removed to manufacture a wound electrode body. Thereafter, the wound electrode body was flattened by compressing the wound electrode body radially inward from the outer peripheral surface.

(Electrode Terminal) The electrode terminal 6 is a member formed by bending a metal plate after forming it into a predetermined shape, and is provided on the end surfaces of the protruding ends 33 and 43 of the flat wound electrode body 2. The members to be joined.

The electrode terminal 6 has a substantially corrugated plate-like joining portion 61 extending on the same plane as the end surfaces of the protruding ends 33 and 43.
In the electrode terminal 6, the uncoated portion of the protruding end portion divided into a plurality of layers of the electrode body is guided by the corrugated plate because the joining portion 61 is formed in a substantially parallel plate shape. Can be positioned at the time of joining. This electrode terminal 6 is shown in FIG.

The electrode terminals 6 were formed of the same material as the current collector to which each was joined. Specifically, the electrode terminal 5 joined to the positive electrode plate 3 is made of aluminum, and the negative electrode plate 4
The electrode terminal 5 to be joined to the electrode was formed of copper.

(Joining of Electrode Body and Electrode Terminal) The flat wound electrode body 2 and the electrode terminal 6 are joined by using the comb type divider 1 by using the protruding end 33 of the flat wound electrode body 2. , 43 are divided into a plurality of layers, and the electrode terminal 6 is welded by TIG welding in a state where the electrode terminal 6 is arranged on the end face of the protruding end of the flat wound electrode body 2. Figure 6 shows the situation at this time.
10 to 10.

First, the protruding ends 33 and 43 of the flat wound electrode body 2 were divided into a plurality of layers by using the comb teeth 11 of the comb divider.

First, the comb teeth 1 are attached to one of the long sides of the protruding ends 33, 43 of the structure in which the uncoated portions 32, 42 are laminated.
1 Insert the tip. At this time, the comb tooth 1 is held in a state where the divided portion 111 is inclined with respect to the end surfaces of the protruding ends 33 and 43.
1 is inserted into the protruding ends 33, 43. (FIG. 6) Subsequently, the divided portion 111 of the comb tooth 11 is
The comb teeth 11 are inserted so as to be substantially parallel to the end face of the reference numeral 43. Specifically, the tip of the comb tooth 11 is
The base end of the split portion of the comb tooth 11 is inserted into the protruding ends 33 and 43 while moving to the other end of the long side of the third tooth 3.
(FIG. 7) Then, the divided part 111 of the comb teeth 11 is
3 was moved to the other end of the long side, and the tip of the comb tooth 11 was held at the other end. At this time, the projecting end 3
The end faces 3 and 43 were held in a state where they protruded from the divided portion 111 of the comb teeth 11. (FIG. 8) Here, as is apparent from FIG. 8, the protruding end portions 33 of the electrode body 2 are divided into a suitable number of groups at a plurality of adjacent intervals of the comb teeth 11.

Subsequently, using a pair of pressing members 7, 7, the protruding end 33,
43 was pressed. In the state where the comb teeth 11 are inserted, the interval between the uncoated portions 32 and 42 in the stacked state is excessively wide.
Uncoated portion 3 in a state of being laminated by pressing 3, 43
2 and 42 are brought into close contact. Uncoated portion 32 in a laminated state,
By bringing the 42 into close contact, sufficient bonding strength can be obtained when the electrode terminals 6 are bonded. Here, the pressure members 7, 7 are made of a copper alloy having thermal conductivity.

Thereafter, as shown in FIG. 10, with the protruding ends 33, 43 pressed against the pressing members 7, 7, the end faces of the protruding ends 33, 43 are joined by the joining portions 61 of the electrode terminals 6. The electrode terminals 6 were arranged so as to cover them, and the joints 61 of the electrode terminals 6 were heated and melted by a TIG welding device and then solidified to join.

At this time, the heat applied to the electrode terminal 6 during the TIG welding is conducted to the current collector, but is conducted to the comb teeth and the pair of pressing members in close contact with the uncoated portion. No heat is conducted to the part. further,
The heat conducted to the comb teeth is absorbed by the cooler of the comb tooth holding section, so that heat is not accumulated in the comb teeth.

Thereafter, the pair of pressing members 7, 7 are removed from the protruding ends 33, 43, and the comb type divider 1 is removed in a procedure reverse to the procedure of inserting the comb teeth 11, so that the electrode terminals 6 are joined. The obtained flat-type wound electrode body 2 was obtained. FIG. 11 shows a flat wound electrode body 2 to which the electrode terminals 6 are joined.

The flat wound electrode body 2 to which the electrode terminals 6 were joined was sealed in a battery case together with an electrolytic solution to produce a lithium secondary battery.

In the embodiment, in the flat wound electrode body 2 to which the electrode terminals 6 are joined, the protruding ends 33 and 43 are divided into four layers by the comb type divider 1 when the electrode terminals 6 are joined. Thus, the protruding length of the protruding ends 33 and 43 could be shortened. That is, as compared with the conventional case in which the electrode terminals 6 are joined on the side surfaces of the protruding ends 33 and 43,
By shortening the projecting length of the 43, the physique of the flat wound electrode body 2 can be reduced in size. Reducing the size of the flat wound electrode body 2 has the effect of reducing the size of the battery using the electrode body 2.

[0070]

According to the comb type divider of the present invention, the comb teeth are inserted and held between at least two sheet-like members forming a laminate, and the at least two sheet-like members are peeled off. The laminate can be divided into a plurality of layers by the gap into which the teeth are inserted.

Further, the method for manufacturing a battery according to the present invention includes an electrode terminal joining step of joining an electrode terminal to a projecting end in a state where the projecting end of the electrode body is divided into a plurality of layers using a comb type divider. With such a structure, the length of the protruding end portion can be reduced, and a battery having a reduced axial length of the electrode body can be manufactured. That is, since the electrode terminal is joined to the end face of the projecting end in a state where the projecting end is divided into a plurality of layers, the length of the uncoated portion required for joining the electrode terminal can be shortened, and the physical size of the electrode body is reduced. The size is reduced, and the size of the manufactured battery is reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a comb type divider.

FIG. 2 is a view showing comb teeth.

FIG. 3 is a diagram showing a cross section of a division portion of a comb tooth.

FIG. 4 is a diagram showing a state in which a positive electrode plate, a negative electrode plate, and a separator are stacked.

FIG. 5 is a diagram showing electrode terminals.

FIG. 6 is a view showing a state in which a tip end of a comb tooth is inserted into a protruding end of a flat wound electrode body.

FIG. 7 is a view showing a state in which a split portion of a comb tooth is inserted into a protruding end of a flat wound electrode body.

FIG. 8 is a view showing a state in which a divided portion of a comb tooth is held at a protruding end of a flat wound electrode body.

FIG. 9 is a view showing a state in which the comb teeth are held by the protruding end of the flat wound electrode body and pressed by a pair of pressing members.

FIG. 10 shows a state in which the electrode terminals are arranged on the end surface of the protruding end while the comb teeth are held by the protruding end of the flat wound electrode body and pressed by a pair of pressing members. FIG.

FIG. 11 is a view showing a state in which an electrode terminal is joined to a protruding end of a flat wound electrode body.

FIG. 12 is a front view in which electrode terminals are joined to a conventional flat wound electrode body.

FIG. 13 is a side view in which electrode terminals are joined to a conventional flat wound electrode body.

[Explanation of symbols]

1 ... comb type divider 11 ... comb teeth 12 ...
Comb-tooth holding unit 13: Cooler 14: Circulation pipe 15:
Constant temperature circulating cooling device 2 ... Flat shape wound electrode body 3 ... Positive electrode plate 4 ...
Negative electrode plate 5 Separator 6 Electrode terminal 31, 41 Active material layer 32, 42 Uncoated portion 33, 43 Projected end 61 Joint

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tetsuji Ito 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 5H022 AA09 AA18 BB06 BB11 BB28 CC08 CC12 CC16

Claims (18)

[Claims] 1. A comb tooth which is inserted and held between one end portions of at least two sheet-like members of a laminated body formed by laminating the sheet-like members and peels off at least two sheet-like members; A comb-type divider, comprising: a comb-tooth holding portion for holding the comb teeth. 2. The comb-type divider according to claim 1, comprising a plurality of said comb teeth. 3. The comb-type division according to claim 2, wherein the plurality of comb teeth are held by the comb tooth holding portion such that each of the comb teeth is movable in a thickness direction of the laminated body. vessel. 4. A substantially bar-shaped dividing portion disposed substantially parallel to an end face of the laminated body when inserted between the one end portions of the at least two sheet-like members laminated. 4. A comb-type divider according to claim 1, further comprising: a base end portion formed integrally with said dividing portion and held by said comb-tooth holding portion. 5. The split portion has an inner side edge located at an inner side of the laminate when the comb teeth are inserted between the one end portions of the at least two sheet-like members. The comb-type divider according to claim 4, which is formed in a shape. 6. The comb-type divider according to claim 4, wherein the dividing portion is formed such that the width in the thickness direction of the laminate gradually increases from the substantially rod-shaped distal end toward the proximal end. . 7. When the comb teeth are inserted between the sheet-like members, one end of the laminated body with the comb teeth inserted and held through the comb teeth is compressed in the thickness direction. The comb-type divider according to any one of claims 1 to 6, further comprising a pair of pressing members. 8. An electrode portion comprising a current collector and an electrode active material applied to both sides of the current collector, and one of the electrode portions coated with the electrode active material and one of the widths of the current collector. An uncoated portion formed on the end side and exposing the surface of the current collector, and a strip-shaped positive electrode plate and a negative electrode plate having a strip-shaped separator,
The positive electrode plate and the negative electrode plate each having an uncoated portion protruding in a direction opposite to each other, and an electrode body having a protruding end portion in which the uncoated portions are stacked with the electrode portion disposed with the separator interposed therebetween. And an electrode terminal having a joint with the protruding end, wherein the protruding end is inserted between the uncoated portions of at least two current collectors arranged adjacent to the protruding end. Electrode for joining the electrode terminal to the end face of the protruding end using a comb-type divider having a comb tooth for dividing the portion into a plurality of layers in the stacking direction, and a comb tooth holding portion for holding the comb tooth. A method of manufacturing a battery having a terminal joining step, wherein in the electrode terminal joining step, the comb teeth of the comb type divider are inserted and held between the uncoated portions to divide the protruding end into a plurality of layers. With the end face of the protruding end protruding from the comb teeth, the joint of the electrode terminal is Is brought into contact with an end face of the end portion, the battery production method is characterized in that a step of welding the the joint portion and the electrode terminal. 9. The method for manufacturing a battery according to claim 8, wherein the comb type divider has a plurality of the comb teeth. 10. The method of manufacturing a battery according to claim 9, wherein the plurality of comb teeth are held such that each of the comb teeth is movable in a thickness direction in which the protruding end portions are stacked. 11. The comb-shaped tooth is formed substantially integrally with the divided portion, the divided portion being substantially parallel to an end face of the protruding end portion when inserted and held between the current collectors. And a base end portion held by the comb tooth holding portion.
10. The method for producing a battery according to any one of items 10 to 10. 12. The split part has an inner side perpendicular to the axial direction, the inner side being located inside the electrode body when the comb teeth are inserted between at least two current collectors. The method for manufacturing a battery according to claim 11, wherein the side portion is formed in a substantially acute angle shape. 13. The production of a battery according to claim 11, wherein the divided portion is formed such that a width in a thickness direction of the protruding end portion gradually increases toward a base end side of the substantially bar-shaped distal end portion. Method. 14. The method for manufacturing a battery according to claim 8, wherein the comb teeth are made of a heat conductive material. 15. The method for manufacturing a battery according to claim 8, wherein the comb tooth holder has a cooler for cooling the comb teeth. 16. The protruding end portion in a state where the comb teeth are inserted between the uncoated portions of the protruding end portion and the protruding end portion is compressed in a stacking direction by a pair of pressing members. The method for manufacturing a battery according to claim 8, wherein the electrode terminal is joined to the battery. 17. The method according to claim 16, wherein the pressure member is made of a heat conductive material. 18. The flat electrode in which the positive electrode plate, the negative electrode plate, and the separator have a band shape, and the positive electrode plate and the negative electrode plate are wound in a flat shape with the separator interposed therebetween. 9. The method for producing a battery according to claim 8, wherein the battery is a shape-wound electrode body.