JP2013179042A - Connection tab for cylindrical battery and connection structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection tab for a cylindrical battery which can achieve excellent electrical connection by ensuring contact area and the surface pressure of the electrode end face of a cylindrical battery and a connection tab, thereby reducing electrical contact resistance, and to provide a connection structure thereof.SOLUTION: The connection structure of a connection tab 4 to a cylindrical battery 3 includes the connection tab 4 which interconnects a plurality of cylindrical batteries 3 electrically by coming into contact with the electrode end face 31 thereof in the axial direction X, an elastic member 5 for deforming the connection tab 4 elastically and bringing into contact with the cylindrical battery 3, and an insulating cover member 2 for pressing the elastic member 5 against the connection tab 4. The connection tab 4 includes a contact facing part 41 which comes into contact with the electrode end face 31 of the cylindrical battery 3 in the axial direction X, and a coupling part 45 for coupling the contact facing parts 41 at a position separated from the electrode end face 31. The elastic member 5 is disposed at a position facing the contact facing part 41.

Description

  The present invention relates to a connection tab connecting structure for electrically connecting a plurality of cylindrical batteries to each other.

Conventionally, an assembled battery module in which a plurality of cylindrical batteries are held in an aligned state and electrode portions at both ends are connected by connection tabs or the like has been used. In general, the connection tab is spot-welded to be connected to the electrode part of the cylindrical battery for conduction. In addition to this, the connection tab can be connected to the electrode portion of the cylindrical battery by using an elastic repulsive force to be conducted.
Further, for example, Patent Document 1 discloses a non-welded type assembled battery. An electrical connection member (hereinafter referred to as a connection member) used for this assembled battery has a terminal connection portion having an elastic portion in order to electrically connect a plurality of secondary battery cells. Further, the protruding connection portion in the terminal connection portion is connected to the electrode terminal of the secondary battery cell. The connecting member achieves stable electrical connection between two or more secondary battery cells without soldering or welding.

Special table 2010-528447 gazette

  However, when the connection tab is resistance-welded to the electrode part of the cylindrical battery, the surface of the connection tab is deformed and roughened due to the shunting of the welding current, wear of the welding electrode, sparks, etc., ensuring the welding quality. There is a risk that it will not be possible. Further, in this case, there is a possibility that problems such as peeling of the joint due to insufficient welding strength and occurrence of sparks due to misalignment of welding may occur due to the influence of vibration and thermal deformation. Further, when disassembling the assembled battery module in which the connection tabs are resistance welded or laser welded, the case of the cylindrical battery itself may be damaged or destroyed by turning the continuous connection tabs. For this reason, there is a risk of leakage of the electrolytic solution or electric leakage, and it is difficult to recycle, reuse, or rebuild a single cylindrical battery.

  Moreover, in order to make a contact with a cylindrical battery (secondary battery cell) and a connection member reliably, even with the connection member of patent document 1, it is inadequate. In Patent Document 1, the protruding connecting portion of the connecting member holds the electrode end (the portion protruding in a circular shape near the center) of the positive electrode (plus electrode) of the cylindrical battery. However, in consideration of downsizing of the size of the cylindrical battery and the connecting member, molding accuracy, positional deviation, and the like, it is difficult to provide a protruding connection portion that is connected to the electrode end of the positive electrode of the cylindrical battery. .

  The present invention has been made in view of such a background, and ensures the contact area and the surface pressure between the electrode end face of the cylindrical battery and the connection tab, reduces the electrical contact resistance, and makes a good electrical connection. The present invention provides a connection tab for a cylindrical battery and a connection structure thereof that can be realized.

One aspect of the first aspect of the present invention is a contact tab that contacts the electrode end faces in the axial direction of a plurality of cylindrical batteries and electrically connects the plurality of cylindrical batteries to each other; A connection tab connecting structure comprising: an elastic member for contacting the battery; and a cover member for pressing the elastic member;
The connection tab includes a contact facing portion that contacts the electrode end surface, and a connecting portion that connects the contact facing portions at a position away from the electrode end surface.
The elastic member is disposed at a position facing the contact facing portion, and has a connection structure for connecting tabs to a cylindrical battery (Claim 1).

According to another aspect of the first invention, there is provided a connection tab that contacts the electrode end surfaces in the axial direction of a plurality of cylindrical batteries and electrically connects the plurality of cylindrical batteries to each other, and the cylinder is pressed by pressing the connection tab. A connection tab connecting structure comprising: an elastic member for contacting the battery; and a cover member for pressing the elastic member;
The connection tab includes a substrate portion, an opening hole opened in the substrate portion, an abutting portion formed by cutting the opening hole from the substrate portion and abutting on the electrode end surface, and the corresponding contact portion opening the opening. A connecting portion that can be connected in a cantilevered manner to one edge of the hole,
The elastic member is arranged at a position facing the contact portion, and has a connection structure of a connection tab to a cylindrical battery (claim 10).

One aspect of the second invention is a connection tab for electrically connecting a plurality of cylindrical batteries to each other,
A facing portion that has an annular portion and faces the electrode end surface in the axial direction of the cylindrical battery;
A plurality of contact claw portions that are formed to project from the inner peripheral side edge portion in the facing portion toward the center side, and are in contact with the center side portion in the electrode end surface in an elastically deformed state;
A connecting tab for a cylindrical battery comprising at least a connecting portion for connecting the facing portions to each other (claim 11).

Another aspect of the second invention is a connection tab for electrically connecting a plurality of cylindrical batteries to each other,
A substrate section;
An opening hole opened in the substrate portion;
A contact portion that is formed by cutting the opening hole from the substrate portion, and contacts the electrode end surface in the axial direction of the cylindrical battery;
A connection tab for a cylindrical battery, characterized in that it has at least a connecting portion for connecting the abutting portion to one edge of the opening hole in a cantilevered manner.

Still another aspect of the second invention is a connection tab for electrically connecting a plurality of cylindrical batteries to each other,
A substrate section;
A contact portion that contacts the electrode end face of the cylindrical battery;
At both ends of the contact portion in one direction, there is a pair of connecting portions that are folded back inwardly of the contact portion and connected to the substrate portion in a state where a gap is formed between the contact portion and the substrate portion. And
The substrate portion and the contact portion are formed to be parallel to each other by bending a single sheet metal at the connecting portion,
A plurality of the abutting portions and the pair of connecting portions are provided in the substrate portion so as to be arranged in a row in the one direction or in a direction orthogonal to the one direction through an opening. It exists in the connection tab for cylindrical batteries (Claim 14).

In the connection structure of the connection tab to the cylindrical battery, which is one aspect of the first invention, an elastic member that is elastically deformed is used in order to reliably contact the connection tab with the electrode end surface of the cylindrical battery.
The connection tab has a contact facing portion that contacts the electrode end surface in the axial direction of the cylindrical battery, and a connecting portion that connects the contact facing portions at a position away from the electrode end surface. Moreover, the elastic member is arrange | positioned in the position facing a contact opposing part. And it presses with a cover member and the contact facing part is made to contact the electrode end surface of a cylindrical battery using the elastic deformation of an elastic member. Thereby, a connection tab can be reliably connected to the electrode end surface of a cylindrical battery, and can be made conductive.

In addition, by changing the size, material, and the like of the elastic member, the pressing force due to the elastic deformation of the elastic member can be adjusted to appropriately change the force for bringing the connection tab into contact with the electrode end surface of the cylindrical battery. The pressing force can be freely designed according to, for example, the thickness, width, material, pressing structure of the connection tab, the output current of the cylindrical battery, and the like.
Furthermore, the contact resistance can be reduced by bringing the connection tab into contact with the electrode end surface of the cylindrical battery at multiple points, the contact area and the surface pressure between the electrode end surface of the cylindrical battery and the connection tab, and the cylindrical shape. The current value output from the battery can be reliably ensured.

Therefore, according to the connection structure of the connection tab, the contact area and the contact pressure between the electrode end face of the cylindrical battery and the connection tab are surely secured, the electrical contact resistance is reduced, and a good electrical connection is realized. can do.
Further, since the connection tab is not welded to the electrode end face of the cylindrical battery, it is possible to take out a single cell of the cylindrical battery, and the cylindrical battery can be easily recycled, reused, and rebuilt. In addition, since the contact facing portion is brought into contact with the electrode end surface of the cylindrical battery using elastic deformation of the elastic member, the displacement due to vibration or heat of the connecting portion between the positive electrode portion and the negative electrode portion of the cylindrical battery is reduced. Can be absorbed.

  Further, in another aspect of the first invention, the connection tab has a contact portion formed by cutting an opening hole from the substrate portion, and is cantilevered to an edge on one side of the opening hole by the connecting portion. It is formed by connecting with. The elastic member is disposed at a position facing the contact portion. And it presses with a cover member and the contact part is made to contact the electrode end surface of a cylindrical battery using the elastic deformation of an elastic member. Thereby, a connection tab can be reliably connected to the electrode end surface of a cylindrical battery, and can be made conductive. In the other aspect of the first invention, other functions and effects are the same as those in the first aspect of the first invention.

Further, in the connection tab for a cylindrical battery which is one aspect of the second invention, the plurality of contact claws are formed from the inner peripheral side edge portion in the facing portion facing the electrode end surface in the axial direction of the cylindrical battery. It protrudes toward the center side. The plurality of contact claws are in contact with the central side portion of the electrode end face in an elastically deformed state. Therefore, even if there is a slight shift in the positional relationship between the cylindrical battery and the connection tab in the lateral direction (plane direction orthogonal to the axial direction), these contacts can be reliably performed.
Therefore, according to the connection tab, it is possible to reliably ensure the contact area and the surface pressure with the electrode end face of the cylindrical battery, reduce the electrical contact resistance, and realize a good electrical connection.

Further, in another aspect of the second invention, the connection tab has a contact portion formed by cutting an opening hole from the substrate portion, and is cantilevered to an edge on one side of the opening hole by the connecting portion. It is formed by connecting with. This connection tab can make the contact part of a cantilever state contact the electrode end surface of a cylindrical battery in the state which elastically deformed the connection part. Therefore, even if there is a slight shift in the positional relationship between the cylindrical battery and the connection tab in the lateral direction (plane direction orthogonal to the axial direction), these contacts can be reliably performed.
Therefore, even with the connection tab, the contact area and the surface pressure with the electrode end surface of the cylindrical battery can be reliably ensured, the electrical contact resistance can be reduced, and a good electrical connection can be realized.

In still another aspect of the second invention, the connection tab is formed in a state in which the contact portion that contacts the electrode end surface of the cylindrical battery is connected to the substrate portion by the pair of connecting portions. This connection tab can contact the both-end-supported contact portion with the electrode end face of the cylindrical battery in a state where the pair of connecting portions are elastically deformed. Therefore, even if there is a slight shift in the positional relationship between the cylindrical battery and the connection tab in the lateral direction (plane direction orthogonal to the axial direction), these contacts can be reliably performed.
Therefore, even with the connection tab, the contact area and the surface pressure with the electrode end surface of the cylindrical battery can be reliably ensured, the electrical contact resistance can be reduced, and a good electrical connection can be realized.

In the connection tab, the substrate portion and the contact portion are formed to be parallel to each other by bending one sheet metal at the connecting portion. Thereby, it is not necessary to perform drawing processing on the pair of connecting portions in order to form the contact portion, and it is possible to prevent the pair of connecting portions from becoming thin and the elastic deformation characteristics (spring property) from being deteriorated.
In the connection tab, a plurality of abutting portions and a pair of connecting portions are arranged in one direction or arranged in a plurality in a direction orthogonal to the one direction through openings, and are provided on the substrate portion. Thereby, a some cylindrical battery can be connected by an abutment tab.

The perspective view which shows the assembled battery module which employ | adopted the connection structure of the connection tab regarding Example 1. FIG. 1 is a side sectional view showing an assembled battery module that employs a connection tab connection structure according to Embodiment 1. FIG. FIG. 3 is a side sectional view showing a part of FIG. FIG. 3 is an enlarged plan view showing a connection tab regarding the first embodiment. FIG. 6 is a view corresponding to FIG. 3 when an insulating cap is used in the first embodiment. The figure equivalent to FIG. 3 at the time of using the insulating sheet regarding Example 1. FIG. The perspective view which shows the connection tab affixed on the sheet | seat regarding Example 1. FIG. The top view which shows the connection tab which connected the 3 or more contact opposing part regarding Example 1 by the connection part. The perspective view which shows a part of connection tab regarding Example 1 from which the shape of a contact nail | claw part differs. The top view which shows the connection tab regarding Example 2. FIG. Side sectional drawing which shows the connection structure of the connection tab regarding Example 2. FIG. FIG. 10 is a plan view showing a connection tab according to the third embodiment. Side sectional drawing which shows the connection structure of the connection tab regarding Example 3. FIG. The top view which shows the connection tab regarding Example 4. FIG. Side sectional drawing which shows the connection structure of the connection tab regarding Example 4. FIG. FIG. 10 is a plan view showing a connection tab according to the fifth embodiment. Side sectional drawing which shows the connection structure of the connection tab regarding Example 5. FIG. Side sectional drawing which shows the other connection structure of the connection tab regarding Example 5. FIG. The perspective view which shows the connection tab regarding Example 6. FIG. Side sectional drawing which shows the connection structure of the connection tab regarding Example 6. FIG. Sectional drawing which shows the state which hold | maintains a connection tab in a case regarding Example 6. FIG. The perspective view which shows the connection tab regarding Example 7. FIG.

A preferred embodiment of the connection tab for a cylindrical battery and the connection structure thereof will be described.
In the connection structure of the connection tab, the contact facing portion has an annular portion, a facing portion facing the electrode end surface of the cylindrical battery, and an inner peripheral side edge portion of the facing portion toward the center side. It may have at least a plurality of contact claws that protrude in a cantilever state and contact the free end in the cantilever state with a center side portion of the electrode end face.
In this case, the contact of the connection tab to the electrode end surface of the cylindrical battery can be more reliably performed by bringing the free end in the cantilevered state of the plurality of contact claws into contact with the center side portion of the electrode end surface. . This contact can be made firmly by sandwiching both ends of the cylindrical battery via an elastic member or the like.
The annular portion of the facing portion can be formed in a shape such as an annular shape or a rectangular shape.

The contact facing portion or the cover member of the connection tab may have a holding portion for holding the elastic member.
In this case, the elastic member can be easily positioned with respect to the cylindrical battery and the connection tab.

The elastic member may be formed in a ring shape or a flat plate shape, and the holding portion may be formed in a shape that holds an inner periphery or an outer periphery of the ring-shaped elastic member. .
In this case, the shape of the elastic member matches the shape of the contact facing portion of the connection tab, and the connection tab can be stably brought into contact with the electrode end surface of the cylindrical battery by the elastic member.
The ring shape includes an annular shape, a square ring shape, and the like, and the flat plate shape includes various plate shapes.

Further, the holding portion may be formed in a shape that sandwiches the elastic member between the contact claw portion (claim 5).
In this case, the elastic member can be stably held at the predetermined position of the contact facing portion of the connection tab by the holding portion.

Further, an insulating cap having insulating properties may be disposed between the connection tab and the cover member.
In this case, when the cover member is formed from a material such as aluminum, copper, carbon (including a carbon composite), or PPS (polyphenylene sulfide) having excellent thermal conductivity, in order to improve heat dissipation, insulation is provided. With the cap, the connection tab and the cover member can be appropriately insulated.

Further, the connection tab may be formed by connecting the three or more contact facing portions by the connecting portion (claim 7).
In this case, three or more cylindrical batteries can be positioned and connected in parallel by three or more contact opposing portions.

Moreover, the said connection tab may be affixed on the sheet | seat which has insulation (Claims 8 and 11).
In this case, it is possible to easily position the connection tabs in the lateral direction with respect to the plurality of cylindrical batteries by sticking the plurality of connection tabs to the adhesive sheet.
Further, by providing the sheet with an insulating property, it is possible to omit an insulating cap and an insulator.

Further, the connection tab, the elastic member, and the cover member are respectively arranged with respect to electrode end surfaces on both sides in the axial direction of the cylindrical battery, and a dimension defining having a through hole between the cover members. The collar is disposed between the cover members, and the connection tabs and the elastic members on both sides in the axial direction are overlapped and sandwiched between the cover members, and the collar is sandwiched. The cylindrical battery may be held by a repulsive force in a state where the elastic member is elastically deformed by being tightened by a bolt inserted into the through hole.
In this case, the connection tabs and the elastic members arranged on both sides in the axial direction of the plurality of cylindrical batteries can be sandwiched by the pair of cover members and stably held.

Hereinafter, embodiments of the connection tab for the cylindrical battery and the connection structure thereof will be described with reference to the drawings.
Example 1
As shown in FIGS. 1 and 2, the connection structure of the connection tab 4 to the cylindrical battery 3 in this example is in contact with the electrode end surfaces 31 in the axial direction X of the plurality of cylindrical batteries 3, thereby 3 is provided with a connection tab 4 for electrically connecting 3 to each other, an elastic member 5 for pressing and elastically deforming the connection tab 4 to contact the tubular battery 3, and a cover member 2 for pressing the elastic member 5. Yes.
The connection tab 4 includes a contact facing portion 41 that contacts the electrode end surface 31 in the axial direction X of the cylindrical battery 3, and a connecting portion 45 that connects the contact facing portions 41 at positions away from the electrode end surface 31. Yes. The elastic member 5 is disposed at a position facing the contact facing portion 41.

Below, it demonstrates in full detail with reference to FIGS. 1-9 about the connection structure of the connection tab 4 to the cylindrical battery 3 of this example.
As shown in FIG. 1, the connection tab 4 of this example is used to electrically connect a plurality of cylindrical batteries 3 to form the assembled battery module 1. The connection tab 4 is made of a metal material having excellent electrical conductivity such as phosphor bronze, stainless steel, and beryllium copper, and having spring properties. The connection tab 4 of this example is connected to the cylindrical battery 3 and brought into conduction by contact with a pressing force by elastic deformation without performing spot welding or the like. The connection tab 4 is formed in a predetermined shape by pressing a metal plate.
The elastic member 5 is formed in a ring shape (ring shape) and is made of a rubber material having insulating properties and heat resistance. The elastic member 5 preferably has a small compression set, a change in elastic modulus, or a secular change. The elastic member 5 can also have a disk shape or the like. Moreover, the elastic member 5 can also be comprised from metal spring materials etc. with a small secular change.

The assembled battery module 1 of this example can be used as a storage battery for installation in a home, a facility, etc., a storage battery for movement to a hybrid vehicle, an electric vehicle, or the like.
The cylindrical battery 3 of this example has a cylindrical shape (columnar shape), is a chargeable / dischargeable secondary battery, and is a lithium ion battery. In addition to this, the cylindrical battery 3 can be a nickel cadmium storage battery, a nickel hydrogen battery, or the like as a secondary battery. The cylindrical battery 3 can also be a single-use primary battery that cannot be charged. Moreover, the cylindrical battery 3 can also be made into a rectangular tube shape.

  As shown in FIG. 3, the outer periphery of the cylindrical battery 3 is covered with an outer sheet 32, and the end of the outer sheet 32 covers the outer peripheral side portions of the axial end surfaces on both sides. The electrode end surface 31A of the positive electrode of the cylindrical battery 3 is formed so as to slightly protrude from the outer peripheral portion of the exterior sheet 32 to the central portion excluding the insulating portion formed on the inner peripheral side. The negative electrode end face 31 </ b> B is formed on the entire inner peripheral side of the outer peripheral side portion of the exterior sheet 32. A plurality of contact pawl portions 43 (to be described later) of the contact facing portion 41 of the connection tab 4 ensure the contact surface pressure and the contact area with respect to any of the electrode end surfaces 31A and 31B of the positive electrode and the negative electrode, and the tip portion is It is formed so as to contact with certainty. Moreover, since the several contact nail | claw part 43 is contacting, the vibration-proof characteristic is fully ensured.

  As shown in FIG. 1, the assembled battery module 1 of this example includes a cover member 2, a plurality of cylindrical batteries 3 arranged in parallel with each other in the cover member 2, and a plurality of cylinders in the cover member 2. And a battery holding spacer 6 for holding the battery 3. The battery holding spacer 6 includes a plurality of plate portions 61 disposed at a plurality of locations in the axial direction X, which are positions on the center side of the electrode end surfaces 31 of the plurality of cylindrical batteries 3, across the plurality of cylindrical batteries 3. , And a plurality of support columns 63 that connect the plurality of plate parts 61 in parallel with each other. The plurality of plate portions 61 have a plurality of holding holes 62 into which the plurality of cylindrical batteries 3 are respectively inserted. In the plurality of plate portions 61, a plurality of cooling holes can be formed in portions where the plurality of holding holes 62 are not provided (between adjacent holding holes 62).

The battery holding spacer 6 of this example is used for positioning and holding the plurality of cylindrical batteries 3 in the cover member 2 while suppressing vibration. The battery holding spacer 6 can be made of a thermoplastic resin or a thermosetting resin. The cover member 2 can be composed of various materials such as metal, resin, carbon composite, ceramics and the like. The cover member 2 of this example is made of an insulating resin.
The battery holding spacer 6 of this example is positioned on the cover member 2 using a support member, a collar 22 and a bolt 23 described later, while holding a plurality of cylindrical batteries 3.

As shown in FIGS. 3 and 4, the contact facing portion 41 of the present example has an annular portion, a facing portion 42 that faces the electrode end surface 31 in the axial direction X of the cylindrical battery 3, and an inner peripheral side of the facing portion 42. It has a plurality of contact claw parts 43 formed to protrude from the edge part 422 toward the center side in a cantilever state. Each contact nail | claw part 43 is comprised so that the free end (tip part) of a cantilever state may contact the center side part in the electrode end surface 31. FIG. In addition, each contact claw part 43 may be made to abdomen contact the center side part in the electrode end surface 31. FIG.
The connection tab 4 of this example is formed by connecting two contact facing portions 41 with a connecting portion 45. The width and shape of the connecting portion 45 can be arbitrarily set.
A holding portion 44 that holds the elastic member 5 is formed in the contact facing portion 41 of the connection tab 4 of this example.

In the contact facing portion 41 of this example, the contact claw portion 43 that contacts the electrode end surface 31 of the cylindrical battery 3 protrudes on one surface of the metal plate (the inner surface that is the surface facing the cylindrical battery 3). Is formed. Further, in the contact facing portion 41, the holding portion 44 that holds the elastic member 5 between the contact claw portion 43 projects to the other surface of the metal plate (the outer surface that is the surface not facing the cylindrical battery 3). Is formed. Moreover, the contact nail | claw part 43 and the holding | maintenance part 44 are formed in order by turns, and the whole is located in a line radially.
The holding portion 44 in this example is formed as a holding claw portion 44. Both the contact claw portion 43 and the holding claw portion 44 are formed by pressing a metal plate.

As shown in FIG. 4, the contact claw portion 43 and the holding portion 44 are formed in a shape protruding from the peripheral edge portion of the through hole 421 aligned with the center of the electrode end surface 31 of the cylindrical battery 3 toward the inner peripheral side. Yes. The contact claw portion 43 is bent so that the base end portion located at the peripheral portion of the through hole 421 is bent toward the cylindrical battery 3 (inner surface), and the remaining distal end portion is parallel to the facing portion 42. Is formed. The holding claw portion 44 is bent so that the base end portion located at the peripheral portion of the through hole 421 is bent to the opposite side (outer surface) from the cylindrical battery 3 and the remaining tip side portion is parallel to the facing portion 42. Is formed. In this example, the number of the contact claw parts 43 and the holding claw parts 44 is the same, and six each is formed.
Moreover, in the contact nail | claw part 43, a some embossing etc. can be performed in the site | part which contacts the electrode end surface 31 of the cylindrical battery 3, and a processus | protrusion can be formed. In this case, the contact claw portion 43 can be reliably contacted by forming the protrusion.

The connection tab 4 of this example is formed by connecting two contact facing portions 41 with a connecting portion 45 in order to connect a plurality of cylindrical batteries 3 in series. The plurality of cylindrical batteries 3 are held by the battery holding spacer 6 in a state where the positive electrode end faces 31A and the negative electrode end faces 31B are alternately arranged. The connection tab 4 having two contact facing portions 41 is arranged in a state in which the positive electrode end surface 31A of the cylindrical battery 3 and the negative electrode end surface 31B of the cylindrical battery 3 adjacent thereto are electrically connected. When the cylindrical batteries 3 are connected in parallel, the electrode end surfaces 31A of the positive electrodes of the cylindrical batteries 3 adjacent to each other may be connected by the connection tabs 4, and the cylindrical batteries 3 adjacent to each other by the connection tabs 4 may be connected. The electrode end faces 31B of the negative electrode may be connected.
Each connection tab 4 is arranged on both sides in the axial direction X of each cylindrical battery 3. The connecting tab 4 disposed on one side of the cylindrical battery 3 in the axial direction X is disposed in the lateral direction (a plane direction orthogonal to the axial direction X) and the other side of the cylindrical battery 3 in the axial direction X. The lateral positions of the connection tabs 4 are shifted from each other in order to connect the adjacent cylindrical batteries 3 in series. Note that the cylindrical batteries 3 may be connected in parallel.

  In addition, the connection tab 4 can also be formed by connecting three or more contact facing portions 41 with a connecting portion 45. In this case, the polarities of three or more cylindrical batteries 3 adjacent to each other are matched, the positive electrode is arranged on one side in the axial direction X, and the negative electrode is arranged on the other side in the axial direction X, so that three or more cylindrical batteries are arranged. 3 can be connected in parallel. Moreover, the connection tab 4 in this case can be used also in the assembled battery module 1 when mixing serial connection and parallel connection.

The plurality of connection tabs 4, the plurality of elastic members 5, and the cover member 2 are respectively disposed with respect to the electrode end surfaces 31 on both sides in the axial direction X of the cylindrical battery 3. When the cover member 2 is made of a conductive material, an insulating sheet or an insulating cap is disposed outside the connecting tab 4 in the axial direction X. The elastic member 5 is arranged in a ring shape with respect to the two contact facing portions 41 of each connection tab 4.
As shown in FIG. 3, the cover member 2 has a protruding portion 21 that protrudes toward the cylindrical battery 3 at a portion facing each elastic member 5 disposed in the contact facing portion 41 of each connection tab 4. doing. The cover member 2 can also be formed without providing the protruding portion 21.

As shown in FIG. 2, the plurality of cylindrical batteries 3 are held between the pair of cover members 2 by bringing the cover members 2 on both sides closer to each other by tightening bolts 23. Between the cover members 2, a dimension defining collar 22 having a through hole 221 is disposed. In this example, a bolt 23 is inserted into a through hole 221 of a collar 22 sandwiched between a pair of cover members 2, and the bolt 23 is screwed to a nut 24.
Here, in FIG. 2, the collar 22 and the bolt 23 are shifted to the side of the cylindrical battery 3 for easy viewing.

  A plurality of cylindrical batteries 3, connection tabs 4 on both sides in the axial direction X, and elastic members 5 are sandwiched between the cover members 2, and the bolts 23 are inserted into the through holes 221 of the collar 22 and tightened, thereby being elastic. A plurality of cylindrical batteries 3 are held in a state where the member 5 is elastically deformed. Each connection tab 4 receives a pressing force due to elastic deformation of the elastic member 5 and is in close contact with the electrode end surface 31 of the cylindrical battery 3 with a constant pressure.

As shown in FIGS. 3 and 4, the connecting portion 45 located between the contact facing portions 41 in the connection tab 4 is bent so as to protrude in a U-shape or the like, and the bent portion 451 is formed. Can be formed. The bent portion 451 can absorb thermal expansion of the connection tab 4 due to heat generation at the electrode portion of the cylindrical battery 3 and vibration applied to the connection tab 4, and connection to the electrode end surface 31 of the cylindrical battery 3. A stable connection of the tab 4 can be ensured. Further, a terminal holding part 452 is formed in the bent part 451, and a voltage monitoring line for measuring the voltage of the cylindrical battery 3 or other wiring can be connected to the terminal holding part 452.
In addition, the voltage monitoring line and other wirings can be connected to a protruding portion 452 protruding from the contact facing portion 41.

  Further, as shown in the drawings, a connection portion 411 for connecting a power supply line (lead wire) for outputting power from the cylindrical battery 3 is connected to any of the other connection tabs 4 (two-dot chain lines in the figure). Can also be provided. The connection portion 411 can be provided adjacent to the contact facing portion 41 in the connection tab 4. The connection part 411 can be formed to protrude to the outer peripheral side of the contact facing part 41 so as to connect the power supply line.

Next, the effect of the connection structure of the connection tab 4 to the cylindrical battery 3 will be described.
In this connection structure, the elastic member 5 that is elastically deformed is used in order to ensure that the connection tab 4 is in contact with the electrode end surface 31 of the cylindrical battery 3. A plurality of contacts in the contact facing portions 41 of the connection tabs 4 are secured by the cover members 2 arranged on both sides in the axial direction X of the plurality of cylindrical batteries 3 by tightening the bolts 23 communicated with the through holes 221 of the collar 22. The claw portion 43 can be brought into contact with the electrode end surfaces 31 of the plurality of cylindrical batteries 3 through the elastic member 5 with elasticity.

In addition, the plurality of contact claw portions 43 can be simultaneously brought into contact with the electrode end surface 31 of the cylindrical battery 3 by utilizing the elastic deformation of the elastic member 5. Thereby, the connection tab 4 can be reliably connected to the electrode end surface 31 of the cylindrical battery 3 and can be made conductive. In addition, by changing the dimensions, material, etc. of the elastic member 5, the elastic repulsive force of the elastic member 5 is adjusted (controlled), and the force for bringing the connection tab 4 into contact with the electrode end surface 31 of the cylindrical battery 3 is appropriately changed. can do. The pressing force can be freely designed according to, for example, the plate thickness, width, material, pressing structure, output current of the cylindrical battery 3 and the like of the connection tab 4.
Furthermore, the contact resistance can be reduced by bringing the plurality of contact claws 43 into contact with the electrode end surface 31 of the cylindrical battery 3, and the contact area between the electrode end surface 31 of the cylindrical battery 3 and the connection tab 4 and The surface pressure and the current value output from the cylindrical battery 3 can be reliably ensured.

Therefore, according to the connection structure of the connection tab 4, the contact area and the surface pressure between the electrode end surface 31 of the cylindrical battery 3 and the connection tab 4 are ensured, the electrical contact resistance is reduced, and the good electrical property is achieved. Connection can be realized.
Further, since the connection tab 4 is not welded to the electrode end surface 31 of the cylindrical battery 3, it is possible to take out a single cell of the cylindrical battery 3. For example, it becomes possible to replace the defective cylindrical battery 3 discovered at the completion of the assembly of the assembled battery module 1 alone. Therefore, the cylindrical battery 3 can be easily recycled, reused, and rebuilt. Further, the contact facing portion 41 is brought into contact with the electrode end surface 31 of the cylindrical battery 3 by utilizing the elastic deformation of the elastic member 5, thereby absorbing the displacement of the connection portion of the connection tab 4 due to vibration or heat. Can do.

The cover member 2 </ b> A and the collar 22 can be formed of an aluminum material having excellent thermal conductivity in order to promote the heat transfer of the cooling air that cools the cylindrical battery 3.
In this case, as shown in FIG. 5, in order to ensure insulation between the cover member 2A and each connection tab 4, an insulating cap 46 is disposed between each connection tab 4 and the cover member 2A. The insulating cap 46 is formed in a shape that covers the outer surface of the connection tab 4. The insulating cap 46 has a facing portion 461 that faces the connection tab 4, and a side wall portion 462 that stands up from the outer edge of the facing portion 461. The insulating cap 46 is disposed with the facing portion 461 facing the outer surface of the connection tab 4 and the side wall portion 462 facing the side surface of the connection tab 4, and is sandwiched between the cover member 2 </ b> A and the connection tab 4.

  As shown in FIG. 6, in addition to the insulating cap 46 made of resin, an insulating sheet (or insulating tape) 46A made of resin such as polyimide can also be used. The insulating sheet 46A can be provided at the place where the connection tabs 4 are arranged, or can be provided for the entire connection tabs 4 arranged in a plurality.

  Further, as shown in FIG. 7, the plurality of connection tabs 4 can be attached to a sheet 47 of an insulating resin (polyethylene terephthalate (PET), polyimide, etc.). The plurality of connection tabs 4 are attached to the surface on which the plurality of cylindrical batteries 3 are positioned with respect to the sheet 47. In this case, a through hole 471 is formed in a portion of the sheet 47 facing the contact facing portion 41 of the connection tab 4, and the connection tab 4 is attached to the sheet 47 with the contact facing portion 41 aligned with the through hole 471. Can be attached. In this case, each connection tab 4 can be easily positioned with respect to the plurality of cylindrical batteries 3.

  In addition, as shown in FIG. 8, when three or more cylindrical batteries 3 adjacent to each other are arranged so as to have the same polarity in the axial direction X, and the three or more cylindrical batteries 3 are connected in parallel, the connection tab 4 Can be formed by connecting three or more contact facing portions 41 by a connecting portion 45. In the figure, in the case of 2 series 7 parallel (2 sets of 7 cylindrical batteries 3 connected in parallel are connected in series. In this case, a plurality of contact facing portions 41 are connected in a mesh shape by connecting portions 45. Then, an appropriate portion of the connecting portion 45 is cut (indicated by a line L in the figure) and separated by a predetermined amount, so that a plurality of contact facing portions 41 are connected to a predetermined number of cylindrical batteries 3. 4 can be used.

Further, as shown in FIG. 9, the plurality of contact claw portions 43 formed on the opposing contact portions 41 of the connection tab 4 have a plurality of fine contacts on the tips of the projecting portions 434 projecting annularly from the peripheral edge of the through hole 433. A shape having the protrusion 435 can be employed. The connection tab 4 brings the plurality of contact protrusions 435 in the protrusion 434 into contact with the electrode end surface 31 of the cylindrical battery 3. The through holes 433 and the protrusions 434 can be formed at a plurality of locations in the facing contact portion 41.
In addition, a plurality (a large number) of through holes 433 and protrusions 434 can be provided with respect to the protrusions 410 protruding in a wide range from the opposed contact part 41. The protrusion 434 can be formed together with the through hole 433 by performing burring. The plurality of contact protrusions 435 can be a large number of protrusions formed when burring is performed. Further, the plurality of contact protrusions 435 can be formed by performing secondary processing on the tip of the protrusion 434.

(Example 2)
This example shows an example in which the structure of the connection tab 4 is different from that in the first embodiment.
As shown in FIGS. 10 and 11, the connection tab 4 can be formed by projecting the entirety of the plurality of contact claws 43 formed in the contact facing portion 41 toward the electrode end surface 31 of the cylindrical battery 3. . In each figure, the case where the connection tab 4 is connected to the electrode end surface 31 of the positive electrode of the cylindrical battery 3 is shown. The plurality of contact claw portions 43 can be formed to project radially from the peripheral edge portion of the through hole 421 formed at the center of the contact facing portion 41 to the inner peripheral side. The plurality of contact claws 43 are formed in a shape that bends toward the cylindrical battery 3 side, and are formed in a cantilever state in which the center side tip is free. The contact claw portion 43 includes a first contact claw portion 43A that forms a front end surface that contacts the electrode end surface 31 of the cylindrical battery 3, and a second end surface that contacts the electrode end surface 31 smaller than the first contact claw portion 43A. The contact claw portion 43B is formed in combination.

The cover member 2 is made of resin, and a holding portion 25 that holds the elastic member 5 by being fitted to the inner peripheral side of the elastic member 5 is formed on the inner surface of the cover member 2. The elastic member 5 is disposed at a portion of the contact facing portion 41 that is on the outer peripheral side of the plurality of contact claw portions 43, and the holding portion 25 is formed to protrude in a circular shape at the portion of the contact facing portion 41.
In addition, although illustration is abbreviate | omitted, the holding | maintenance part 25 can also be formed in the shape which bend | folds the outer edge part of the contact opposing part 41 of the connection tab 4 to an outer surface, and hold | maintains the outer peripheral side of the elastic member 5.

  In the connection tab 4 for the cylindrical battery 3, the plurality of contact claws 43 are in contact with the central side portion of the electrode end surface 31 in a state of being elastically deformed. Therefore, even if there is a slight shift in the positional relationship between the cylindrical battery 3 and the connection tab 4 in the lateral direction (plane direction orthogonal to the axial direction X), these contacts can be reliably performed. Therefore, according to the connection tab 4 of this example, the contact area and the surface pressure with the electrode end surface 31 of the cylindrical battery 3 are reliably ensured, the electrical contact resistance is reduced, and a good electrical connection is realized. be able to. In this example, the contact nail | claw part 43 is formed in 12 places, and a lower electrical contact resistance is realizable.

In this example, the elastic member 5 is used. However, when the elastic repulsion force of the plurality of contact claw portions 43 in the connection tab 4 is large, the elastic member 5 may not be used. In this case, the connection tab 4 can be brought into elastic contact with the electrode end surface 31 of the cylindrical battery 3 only by the elastic repulsive force of the plurality of contact claws 43. In this case, when an aluminum material having thermal conductivity and conductivity is used for the cover member 2, an insulating sheet or the like is disposed between the connection tab 4 and the cover member 2.
Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

(Example 3)
This example also shows an example in which the structure of the connection tab 4 is different from that in the first embodiment.
As shown in FIGS. 12 and 13, the connection tab 4 is formed with a plurality of contact claw portions 43 </ b> C in a cantilever state from the peripheral edge portion of the through hole 421 toward the inner peripheral side in the contact facing portion 41. A contact center portion 48 that contacts the electrode end surface 31 of the cylindrical battery 3 may be formed in a both-sided state at the center portion of the cylindrical battery 421. The contact center portion 48 is bridged to the inner peripheral side edge portion 422 of the through hole 421 by a plurality of bridging portions 481. The plurality of contact claw portions 43 </ b> C and the contact center portion 48 are formed to bend toward the inner surface so as to contact the electrode end surface 31 of the cylindrical battery 3. Also in this case, the elastic member 5 can be disposed between the connection tab 4 and the cover member 2.
Also in this example, other configurations are the same as those of the second embodiment, and the same effects as those of the second embodiment can be obtained.

Example 4
This example also shows an example in which the structure of the connection tab 4 is different from that in the first embodiment.
As shown in FIGS. 14 and 15, the plurality of contact claw portions 43 </ b> D formed on the contact facing portion 41 of the connection tab 4 are rigid bodies in which the tip end portion 431 that contacts the electrode end surface 31 of the cylindrical battery 3 hardly undergoes elastic deformation. It is also possible to form a connecting portion 432 that can be elastically deformed on the outer peripheral side of the tip portion 431. Also in this case, the front end portion 431 and the connecting portion 432 of the contact claw portion 43D can be formed by cutting a metal plate. An elastic member 5 can be disposed between the connection tab 4 and the cover member 2. The elastic member 5 of this example was formed in a disk shape as a flat plate so as to be able to press immediately above the tip portion 431 of the contact claw portion 43D.

A holding portion 49 that holds the outer periphery of the elastic member 5 is formed in the facing portion 42 of the contact facing portion 41 of the connection tab 4. Further, the cover member 2 can be formed with a protrusion 26 that presses the elastic member 5 against the connection tab 4.
Also in this example, other configurations are the same as those of the second embodiment, and the same effects as those of the second embodiment can be obtained.

(Example 5)
This example also shows an example in which the structure of the connection tab 4 is different from that in the first embodiment.
As shown in FIGS. 16 and 17, a contact flat part 412 that is in surface contact with the electrode end surface 31 of the cylindrical battery 3 is formed on the contact facing part 41 of the connection tab 4 in a state parallel to the contact facing part 41. Can do. The contact flat plate portion 412 can be formed so as to protrude from the inner surface so as to be offset from the contact facing portion 41.
The elastic member 5A of this example is configured by a leaf spring formed by processing a metal plate. The elastic member 5 </ b> A can be formed by a central portion 51 that contacts the contact flat plate portion 412 and a plurality of outer peripheral portions 52 that project radially toward the outer peripheral side around the central portion 51. The cover member 2 is provided with a protrusion 27 for guiding the outer peripheral portion 52 of the elastic member 5A and positioning the elastic member 5A. The cover member 2 of this example is made of an insulating resin.

Also in this case, the cover member 2 is brought close to the plurality of cylindrical batteries 3 by tightening the bolts 23, the elastic member 5A is elastically deformed, and the connection tab 4 is brought into contact with the electrode end surface 31 of the cylindrical battery 3. Can do.
Further, as shown in FIG. 18, the elastic member may be a coil spring 5B. In this case, when the cover member 2A is made of a conductive material, an insulating sheet (or insulator) 40 is sandwiched between the connection tab 4 and the coil spring 5B.
The elastic member 5A can be formed in various shapes. Moreover, the center part 51 can also be made into many points. In addition, a protrusion for making contact with the electrode end surface 31 of the cylindrical battery 3 can be provided in the central portion 51.
Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

(Example 6)
This example shows another variation of the connection structure of the connection tab 4 to the cylindrical battery 3.
As shown in FIG. 19, the connection tab 4 of this example is formed by opening the substrate portion 40, the opening hole 401 opened in the substrate portion 40, and the opening hole 401 from the substrate portion 40, and comes into contact with the electrode end surface 31. The contact part 402 and the connection part 403 which connects the contact part 402 to the edge part of the one side in the opening hole 401 in a cantilever state are provided.
The connection tab 4 of this example is used to electrically connect a plurality of cylindrical batteries 3 in parallel and in series. The opening hole 401 and the contact part 402 are formed corresponding to the position where each cylindrical battery 3 is arranged.

The abutting portion 402 is formed in a circular shape in accordance with the cylindrical cylindrical battery 3 so as to be parallel to the substrate portion 40. The contact portion 402 is formed in parallel to the substrate portion 40 by bending the connecting portion 403 when the opening hole 401 is opened in the substrate portion 40.
Also in the connection tab 4 of this example, the elastic member 5 is disposed at a position facing the contact portion 402 and receives the elastic deformation force of the elastic member 5 so that the contact portion 402 is placed on the electrode end surface 31 of the cylindrical battery 3. It is comprised so that it may contact. The abutting portion 402 is provided with a reinforcing rib 404 protruding to increase its rigidity. The elastic member 5 of this example is a spring (torsion coil spring).
Further, the contact portion 402 can be provided with a holding claw for holding the elastic member 5. The holding claws can be formed at positions facing a plurality of locations (three locations) in the circumferential direction of the elastic member 5.

As shown in FIG. 20, the outer periphery of the plurality of cylindrical batteries 3 is held by a resin battery holding spacer 6, and when the battery holding spacer 6 and the plurality of cylindrical batteries 3 are accommodated in the case 20, the case 20 The contact portion 402 is brought into contact with the electrode end surface 31 of the cylindrical battery 3 through the elastic member 5 by the upper cover member 2 </ b> A constituting a part of the battery. The elastic member 5 is disposed at a position facing one electrode end surface 31 in the cylindrical battery 3, and is not disposed at a position facing the other electrode end surface 31.
The battery holding spacer 6 has a fitting hole 64 for fitting the lower part of the cylindrical battery 3 and an insertion hole 65 for inserting the upper part of the cylindrical battery 3.

  As shown in the figure, the upper cover member 2A located on the side where the elastic member 5 is disposed and the lower cover member 2B located on the side where the elastic member 5 is not disposed are provided on the electrode end surface 31 of the cylindrical battery 3. Projections 28A and 28B are formed to face the positions. The protrusion 28 </ b> A of the upper cover member 2 </ b> A is disposed on the inner peripheral side of the elastic member 5 and is formed at a height that does not contact the connection tab 4. The protrusion 28 </ b> B of the lower cover member 2 </ b> B is formed at a height that presses the connection tab 4 against the electrode end surface 31 of the cylindrical battery 3. By disposing the elastic member 5 only on one electrode end surface 31 of the cylindrical battery 3, it becomes easy to hold the cylindrical battery 3 with an appropriate pressing force.

  As shown in FIGS. 19 and 21, in the board portion 40 of the connection tab 4, the connection tab 4 is attached to the case 20 at both ends of the entire portion where the plurality of opening holes 401 and the contact portions 402 are formed. A tab fitting portion 405 for fitting into the provided rib 201 is formed. The tab fitting portion 405 is formed by left and right protrusions that sandwich the rib 201 of the case 20 at one end portion and the other end portion in one direction B of the connection tab 4. By forming the tab fitting portion 405 in the connection tab 4, the connection tab 4 can be easily positioned with respect to the case 20 when the connection tab 4 is brought into contact with the electrode end surface 31 of the cylindrical battery 3.

Also in the connection structure of the connection tab 4 of this example, the connection tab 4 is securely connected to the electrode end surface 31 of the cylindrical battery 3 by pressing the contact portion 402 by the elastic member 5 as in the first embodiment. And can be made conductive.
Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

(Example 7)
This example shows an example in which the structure of the connection tab 4 is different from that in the first embodiment.
As shown in FIG. 22, the connection tab 4 of this example is used for electrically connecting a plurality of cylindrical batteries 3 in parallel and in series. The connection tab 4 is formed between the contact portion 402 and the substrate portion 40 at both ends in one direction B of the contact portion 402 and the contact portion 402 that contacts the electrode end surface 31 of the cylindrical battery 3. And a pair of connecting portions 403 that are folded back in the inner direction of the contact portion 402 and connected to the substrate portion 40 in a state where the gap S is formed. The substrate portion 40 and the contact portion 402 are formed to be parallel to each other by bending a single sheet metal at the connecting portion 403. The pair of connecting portions 403 is formed such that the interval between the end portions in one direction B on the contact portion 402 side is wider than the interval between the end portions in one direction B on the substrate portion 40 side.

  In the connection tab 4, a plurality of abutting portions 402 and a pair of connecting portions 403 are provided on the substrate portion 40 side by side in the direction B and the direction W orthogonal to the one direction B through the opening 406. The substrate part 40 is divided into a plurality of parts in one direction B. A plurality of contact portions 402 and a pair of connecting portions 403 are arranged in the orthogonal direction W of the contact portion 402 via the opening 406 between the substrate portions 40. The connection tab 4 is formed by bending a plurality of substrate portions 40 arranged in one direction B and a plurality of contact portions 402 arranged in one direction B so as to meander by a pair of connecting portions 403. Yes.

Further, as shown in the figure, a voltage monitoring terminal portion 407 used for monitoring the voltage of the cylindrical battery 3 is extended on the substrate portion 40. The voltage monitoring terminal portion 407 is formed by being bent from the substrate portion 40 and is connected to a circuit substrate disposed on the side surface of the case 20 that houses the plurality of cylindrical batteries 3 and the battery holding spacer 6.
Further, reinforcing flange portions 408 that are bent from the contact portion 402 and increase the rigidity of the contact portion 402 are provided at both ends of each contact portion 402 in the orthogonal direction W.

In the connection tab 4 of this example, by forming a connection tab 4 by bending a single sheet metal, it is not necessary to draw the pair of connecting portions 403 in order to form the contact portion 402, and a pair of connection tabs 4 are formed. It can prevent that the connection part 403 becomes thin and an elastic deformation characteristic (spring property) deteriorates.
Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Assembly battery module 2 Cover member 3 Cylindrical battery 31 Electrode end surface 4 Connection tab 41 Contact opposing part 45 Connection part 5 Elastic member

Claims (15)

A connection tab that contacts the electrode end surfaces in the axial direction of the plurality of cylindrical batteries and electrically connects the plurality of cylindrical batteries to each other; and an elastic member that presses the connection tab to contact the cylindrical batteries. A connection structure of a connection tab comprising a cover member for pressing the elastic member,
The connection tab includes a contact facing portion that contacts the electrode end surface, and a connecting portion that connects the contact facing portions at a position away from the electrode end surface.
The connection structure of the connection tab to the cylindrical battery, wherein the elastic member is disposed at a position facing the contact facing portion.   2. The connection structure of the connection tab to the cylindrical battery according to claim 1, wherein the contact facing portion has an annular portion and faces the electrode end face of the cylindrical battery, and an inner periphery of the facing portion. It has at least a plurality of contact claws that protrude from the side edge toward the center side in a cantilevered state, and that are in contact with the free end in the cantilevered state on the center side portion of the electrode end surface. The connection structure of the connection tab to the cylindrical battery characterized by this.   The connection structure of the connection tab to the cylindrical battery according to claim 1 or 2, wherein the contact facing portion or the cover member of the connection tab has a holding portion for holding the elastic member. The connection structure of the connection tab to the cylindrical battery.   The connection structure of the connection tab to the cylindrical battery according to claim 3, wherein the elastic member is formed in an annular shape or a flat plate shape, and the holding portion is an inner periphery or an outer periphery of the annular elastic member. A structure for connecting a connection tab to a cylindrical battery, wherein the connection tab is formed in a shape that holds the battery.   The connection structure of the connection tab to the cylindrical battery according to claim 3, wherein the holding portion is formed in a shape that sandwiches the elastic member between the contact claw portion and the holding portion. Connection structure of the connection tab to the battery.   The connection structure of the connection tab to the cylindrical battery according to any one of claims 1 to 5, wherein an insulating cap having an insulating property is disposed between the connection tab and the cover member. The connection structure of the connection tab to the cylindrical battery characterized by this.   The connection structure of the connection tab to the cylindrical battery according to any one of claims 1 to 6, wherein the connection tab is formed by connecting three or more of the contact facing portions by the connection portion. A connection structure of a connection tab to a cylindrical battery.   In the connection structure of the connection tab to the cylindrical battery as described in any one of Claims 1-7, The said connection tab is affixed on the sheet | seat which has insulation, To the cylindrical battery characterized by the above-mentioned. Connection tab connection structure. The connection structure of the connection tab to the cylindrical battery according to any one of claims 1 to 8, wherein the connection tab, the elastic member, and the cover member are provided on electrode end surfaces on both axial sides of the cylindrical battery. For each,
Between the cover members, a dimension defining collar having a through hole is arranged,
Between the cover members, the cylindrical battery, the connection tabs on the both sides in the axial direction, and the elastic member are overlapped and sandwiched, and the collar is sandwiched and bolts inserted through the through holes of the collar By being tightened, the electrode end surface and the contact facing portion of the connection tab are electrically connected and held by a repulsive force in a state where the elastic member is elastically deformed. Connection structure of the connection tab to the battery. A connection tab that contacts the electrode end surfaces in the axial direction of the plurality of cylindrical batteries and electrically connects the plurality of cylindrical batteries to each other; and an elastic member that presses the connection tab to contact the cylindrical batteries. A connection structure of a connection tab comprising a cover member for pressing the elastic member,
The connection tab includes a substrate portion, an opening hole opened in the substrate portion, an abutting portion formed by cutting the opening hole from the substrate portion and abutting on the electrode end surface, and the corresponding contact portion opening the opening. A connecting portion that can be connected in a cantilevered manner to one edge of the hole,
The connection structure of the connection tab to the cylindrical battery, wherein the elastic member is disposed at a position facing the contact portion. A connection tab for electrically connecting a plurality of cylindrical batteries to each other,
A facing portion that has an annular portion and faces the electrode end surface in the axial direction of the cylindrical battery;
A plurality of contact claw portions that are formed to project from the inner peripheral side edge portion in the facing portion toward the center side, and are in contact with the center side portion in the electrode end surface in an elastically deformed state;
A connecting tab for a cylindrical battery, comprising at least a connecting portion for connecting the facing portions.   The connection tab for a cylindrical battery according to claim 11, wherein the connection tab is affixed to an insulating sheet. A connection tab for electrically connecting a plurality of cylindrical batteries to each other,
A substrate section;
An opening hole opened in the substrate portion;
A contact portion that is formed by cutting the opening hole from the substrate portion, and contacts the electrode end surface in the axial direction of the cylindrical battery;
A connecting tab for a cylindrical battery, comprising at least a connecting portion for connecting the abutting portion to an edge portion on one side of the opening hole in a cantilever state. A connection tab for electrically connecting a plurality of cylindrical batteries to each other,
A substrate section;
A contact portion that contacts the electrode end face of the cylindrical battery;
At both ends of the contact portion in one direction, there is a pair of connecting portions that are folded back inwardly of the contact portion and connected to the substrate portion in a state where a gap is formed between the contact portion and the substrate portion. And
The substrate portion and the contact portion are formed to be parallel to each other by bending a single sheet metal at the connecting portion,
A plurality of the abutting portions and the pair of connecting portions are provided in the substrate portion so as to be arranged in a row in the one direction or in a direction orthogonal to the one direction through an opening. Connection tab for cylindrical batteries. The connection tab for a cylindrical battery according to claim 14, wherein the substrate portion is provided in a plurality of parts in the one direction,
A connection tab for a cylindrical battery, wherein a plurality of the contact portions and the pair of connecting portions are arranged in the orthogonal direction through the opening between the substrate portions.

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