JP3252846B2 - Non-aqueous electrolyte secondary battery and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a non-aqueous electrolyte secondary battery, and more particularly to a cylindrical lithium secondary battery having a structure suitable for mass production and a method of manufacturing the same.

[0002]

2. Description of the Related Art A secondary battery using a non-aqueous electrolyte is used in place of a battery using an aqueous electrolyte such as a lead battery or a nickel cadmium battery. Non-aqueous electrolyte secondary batteries are
Compared to conventional secondary batteries using aqueous electrolytes, they have a larger volume or weight capacity density and can extract high voltage, so they can be used as power sources for small equipment instead of power supplies for small equipment. Expected.

[0003] Non-aqueous electrolyte secondary batteries include a strip-shaped negative electrode as represented by a lithium ion secondary battery using a negative electrode capable of doping and undoping lithium and a positive electrode containing a transition metal oxide. A band-shaped negative electrode coated with a negative electrode active material on a side current collector, and a band-shaped positive electrode coated with a positive electrode active material on a band-shaped positive electrode current collector, or a laminate obtained by laminating via a separator, or After producing a battery element called a cylindrical jelly roll in which the laminate is spirally wound, the battery element is housed in a battery can, and a conductive lead is connected by welding to perform a conductive connection, and then a predetermined electrolytic solution is formed. After injecting, sealing is performed to manufacture a battery.

[0004] In particular, a battery in which a cylindrical battery element is housed in a battery can has excellent sealing properties and is cylindrical, so that all parts are in contact with the same pressure, so that it does not depend on the position of the battery element. It has the feature that a uniform battery reaction can be performed. Therefore, cylindrical batteries occupy an important position not only in portable secondary batteries but also in large-sized batteries used for the purpose of extracting a large current, such as electric vehicles and electric assist bicycles. It is also expected to be used as a large-sized battery.

An example of such a cylindrical battery is disclosed in US Pat. No. 4,943,497, in which a spirally wound battery element is placed in a cylindrical battery can. Then, an external terminal member serving as a positive terminal is attached to the sealing side via an insulating gasket, and the battery can is used as a negative terminal. The negative electrode lead of the wound battery element is joined to the inner wall of the battery can, and the positive electrode lead of the wound battery element is electrically connected to an external terminal. The positive terminal member has a safety valve that releases the internal pressure when the pressure inside the battery rises abnormally.The strip-shaped positive internal lead is welded to the safety valve to connect the battery element to the external terminal. Has an electrical connection. As described above, in order to obtain the internal lead and the external terminal, conduction is performed through a conductive relay member such as a safety valve instead of directly joining the two, but the welding work for that purpose is performed by sealing. It is necessary to weld the battery header and the strip-shaped positive electrode side lead before performing this operation.

[0006]

In the above-mentioned U.S. Patent, the center of the safety valve and the tip of the positive electrode lead are ultrasonically welded, and then the elongated positive electrode lead is folded and housed in the battery can. Become. Since the welding operation is naturally performed outside the battery can, it is necessary to make the length of the positive electrode side lead longer accordingly. The same applies to the case where the internal lead and the external terminal are directly welded.

However, the storing step of folding a long lead so as not to cause a short-circuit accident requires a skill and is not suitable for mass production. Further, there is a problem that it is difficult to improve the reliability of the product.

Accordingly, it is an object of the present invention to provide a non-aqueous electrolyte secondary battery having a structure that is easy to assemble and suitable for mass production and has a highly reliable structure, and a method of manufacturing the same.

[0009]

According to the non-aqueous electrolyte secondary battery of the present invention, the internal lead of the wound battery element housed in the container and the external terminal member provided on the sealing side of the container are connected. In a secondary battery configured to be electrically connected via a relay member, the relay member is processed so as to press and fix the core of the wound battery element, and presses an internal lead against an end surface of the core. And a protruding surface that enables electrical connection between the relay member and the internal lead.

In particular, it is preferable that the end surface of the core projects from the winding end surface of the battery element toward the projecting surface of the relay member in order to facilitate the welding operation of the internal lead. It is preferable to provide a plurality of internal leads because the internal resistance can be reduced.

The conductive relay member is characterized in that the side remote from the projecting surface has an annular flange structure along the inner periphery of the container. Further, a heat-resistant member is bonded to an end face of the core.

Further, according to the present invention, a wound battery element having a core in the center and having a positive electrode side internal lead and a negative electrode side internal lead is provided for a battery can so that the end face of the core is exposed to the sealing side. A step of placing one of the internal leads on the end surface of the core and joining one of the internal leads to the projecting surface of the conductive relay member with the end surface of the core as a pedestal; and A step of arranging and closing the external terminal member on the sealing side of the container so that the external terminal member is electrically connected to the end of the non-aqueous electrolyte secondary battery. .

In this manufacturing method, the step of joining is ultrasonic welding, and the step of forming a supporting projection for supporting the conductive relay member on the inner surface of the container before the ultrasonic welding step is provided. It is also characterized in that ultrasonic welding is performed in a state where the sex relay member is held by the supporting protrusion. Further, a cylindrical gasket is interposed between the supporting protrusion and the conductive relay member, and a step of disposing an external terminal member on the conductive relay member via a safety valve inside the gasket; The method further includes a step of caulking the end together with the gasket to join the external terminal member, the safety valve, and the conductive relay member. Furthermore, the method includes a step of forming a pedestal by connecting a heat-resistant member to the core end surface before positioning the internal lead on the end surface of the core, and a step of bending and arranging the internal lead on the heat-resistant member. And

In particular, according to the present invention, a battery element formed by forming a positive electrode active material layer and a negative electrode active material layer on each of a positive electrode current collector and a negative electrode current collector, laminating via a separator, and winding is accommodated in a battery can. In the method for producing a non-aqueous electrolyte secondary battery, the parts to be joined of the plurality of electrode leads joined to the battery element housed in the battery can are bent so as to be located at the upper end of the core of the battery element. The conductive connecting member is placed on the gasket mounted on the upper part of the battery can, and the portions to be bonded of the plurality of electrode leads and the connecting portion of the conductive connecting member are welded using the upper end of the core as a pedestal, and then A method for manufacturing a non-aqueous electrolyte secondary battery in which the battery can is sealed with the conductive relay member and the battery header in contact with each other is obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a non-aqueous electrolyte battery according to the present invention cut along a plane including a central axis.

The non-aqueous electrolyte secondary battery 1 of the present invention comprises a battery can 2 containing a composite oxide of lithium and at least one transition metal, such as lithium cobalt acid, lithium manganate, and lithium nickel acid. Positive electrode 3 in which a positive electrode active material is applied to a positive electrode current collector made of aluminum foil,
A negative electrode 4 in which a negative electrode active material composed of a carbonaceous material capable of doping or undoping lithium, a metal composite oxide or the like is coated on a negative electrode current collector such as copper is laminated via a porous separator 5. The battery element 7 wound using the core 6 is housed.

A plurality of internal leads 8 for the positive electrode are joined to the positive electrode 3 of the battery element 7 in order to reduce the internal resistance. One end of each of the internal leads 8 is inserted from above the battery can. The projecting surface of the plate-shaped conductive relay member 9 having a substantially V-shaped cross section and the upper end portion 10 of the core 6 are pedestal and joined by welding. The conductive relay member 9
A safety valve 11 that releases internal pressure when the pressure inside the battery abnormally rises, and a positive electrode terminal 12 serving as an external terminal are conductively connected to form a battery header 13, which is sealed by a gasket 15.

On the other hand, a plurality of negative electrode conductive leads 14 are joined to the negative electrode 4 on the opposite side of the positive electrode lead 8 of the battery element, that is, the side to which the internal lead 8 is connected. Is connected directly to the inner wall of the battery can 2 at the lower part of the wound body to form a conductive connection without taking out the negative electrode conductive tab from the negative electrode to the upper part.

At the lower end of the winding core, a plurality of negative conductive leads 14 may be pressed against the center of the bottom of the battery can as shown in the figure, or the connection between the negative conductive lead 14 and the battery can is made at the bottom of the battery can. The lower end surface of the core may be directly in contact with the bottom of the battery can at a location avoiding the center.

As described above, since the positive electrode-side internal lead of the wound type battery element having the core in the center portion is configured to be pressed against the end face of the core by the relay member, the relay member is simply an internal lead. In addition to the electrical connection between the battery core and the external terminals, it also has the function of fixedly disposing the core in the center of the battery can. In addition, since the inner lead and the relay member can be joined by ultrasonic welding or the like using the end surface of the core as a pedestal, the connection between the inner lead and the relay member must be performed in a state where the joint is arranged inside the battery can. Can be. Therefore, not only is it unnecessary to lengthen the internal leads longer than necessary, but also it is not necessary to store the internal leads in a container so as to be folded, so that the assembly is easy and the structure is suitable for mass production.

In particular, in the present invention, since the end surface of the core projects from the winding end surface as shown in the figure, the adverse effect of heat or the like on the battery element can be reduced, and the projecting surface of the relay member 9 is formed by the core end surface. Since the relay member is processed so as to pressurize, the core is firmly fixed to the center of the battery can when the external terminal is swaged and sealed. Since the winding core is fixed to the center of the battery container in this manner, a highly reliable battery in which characteristic deterioration or characteristic change due to vibration does not easily occur can be obtained.

On the other hand, in the configuration disclosed in the above-mentioned US Patent, the end face of the core is recessed inward from the end face of the battery element, and there is no suggestion about the use of the core as in the present invention. I can't get it. Further, in the configuration in which the strip-shaped electrode leads are stored in a folded state, the current of the battery element is concentrated on the leads, so that there is a problem that IR loss is large and high-rate discharge cannot be performed. Are welded together with the conductive relay member on the core, so that the IR loss is small.

Japanese Unexamined Patent Publication No. 9-35701 discloses a technique in which the internal resistance is reduced by using a plurality of internal electrode leads, and the core is used as a relay point with an external terminal member. However, although a plurality of leads are joined to the end surface of the core, a single strip-shaped lead is pulled out from there again, and when housed in a battery can, as described in the prior art. Thus, it is necessary to fold the strip-shaped lead, and this does not suggest a solution to the above-described problem.

As described above, according to the present invention, after the internal lead attached to the battery element is joined to the conductive relay member in the battery container using the core of the core of the battery element, Since the structure is such that the relay member can be brought into contact with the battery header to make conductive connection, the conductive connection process is simplified, and IR loss due to the electrode lead for connection to the battery header is reduced. Can be lowered,
A non-aqueous electrolyte secondary battery having a large capacity density and easy assembly with reduced IR loss can be obtained. The battery header referred to here is a member constituting an external terminal on the sealing side,
As necessary, a structure such as a safety valve is integrated,
It means a conductive member that is caulked to the battery can in the sealing step on the sealing side.

In the description of the above-described embodiment, an example in which the relay member is provided only on the positive electrode side has been described. However, the battery can is configured to have sealing portions at both ends, and the negative electrode side is also similar to the above-described embodiment. Alternatively, a configuration may be used in which the negative electrode side internal lead and the negative electrode side external terminal are connected via a relay member.

Next, the conductive relay member 9 formed by deforming the plate member employed in the present invention will be described in more detail with reference to FIGS.

As shown in FIGS. 2 (a) and 2 (b), the conductive relay member 9 according to the first embodiment of the present invention has an internal electrode located at the center at the upper end of the core. It has a connection portion 16 with a lead, and has a conductive connection portion 17 with a battery header constituting a safety valve or the like at both ends so that both ends can be brought into contact with the battery header to form a conductive connection. It is created by bending a metal plate. The joint 16 is spring-processed so that the inner lead can be pressed against the end face of the core inside the battery can. Further, it is preferable that the end surface 18 of the conductive connecting portion 17 conforms to the shape of the inner wall surface of the gasket, such as an arc shape, and is in close contact with the inner wall surface of the gasket.

FIGS. 3 (a) and 3 (b) show a conductive relay member according to a second embodiment of the present invention, which is connected to an annular conductive connecting portion 19 and an annular conductive connecting portion. It has a joint 16 with the electrode lead similar to 2 (a). In the conductive relay member shown in FIG. 2, the thickness of the contact portion between the component and the gasket of the battery header is increased, and the amount of deformation of the gasket used for sealing is different. Therefore, even if the amount of deformation is different, leakage occurs from the sealing portion. Although it is necessary to use a thick member that does not cause any problem, when the conductive relay member shown in FIG. 3 is used, the entire circumference of the annular conductive connection portion comes into contact with the gasket. In addition, reliable sealing can be easily realized.

FIGS. 4A and 4B show a conductive relay member according to a third embodiment of the present invention. As the conductive relay member, an annular conductive connection portion 19 and a cone connected thereto are provided. It has a trapezoidal wall surface 20 and a junction 16 with an electrode lead at the top of the truncated cone. Since this conductive relay member has the annular conductive connection portion 19, it has an effect equivalent to that of the conductive relay member shown in FIG. Connection part 19
Are connected over the entire surface, so that the IR loss between the joint 16 and the annular conductive connection 19 can be further reduced.

FIGS. 5A and 5B show a conductive member according to a fourth embodiment of the present invention. The frustoconical wall 20 has an opening 21. By having the opening, the gas generated at the time of abnormality in the battery reaction can be quickly passed and the safety valve can be operated, so that the safety can be enhanced. In addition, the opening 21 is not limited to a circular shape, and can have any shape. By increasing the area of the opening in a range where the impedance does not increase, the flow path through which the gas passes increases. Therefore, the weight of the battery can be reduced.

The conductive relay member according to the present invention is preferably made of the same metal material as the electrode lead, and when joined to the joint of the electrode lead connected to the positive electrode, the material of the electrode lead on the positive electrode is preferably used. It is preferable to use the same aluminum and its alloy as described above, and it is possible to use aluminum or its alloy which is press-formed.

Further, in the battery of the present invention, the connection between the electrode lead and the conductive relay member at the upper end of the core can be performed by various methods. In particular, in ultrasonic welding, welding can be performed in a state where the temperature rise is relatively small.
Moreover, it is possible to join by ultrasonic welding even in the case of a member such as aluminum which is difficult to weld by resistance welding.

In ultrasonic welding, a joint is formed by intensive heat generation at a metal interface. However, since the temperature near the joint also increases, the core is made of a material having high heat resistance. Preferably, only the upper part of the core is made of a material having high heat resistance.

The core may be made of a synthetic resin such as polypropylene or polybutylene terephthalate which is not affected by the electrolyte.

FIGS. 6 to 8 are views for explaining the core used in the battery of the present invention, and show only the upper part of the core.

The winding core 6 shown in FIG. 6 has only the upper part formed of the metal material portion 22. This may be such that a tube made of a metal material is screwed to the upper portion by a method such as fitting and screwing into the core 6, or may be formed integrally with these materials when the core 6 is formed.

FIG. 7 shows a process of fitting and screwing the end metal tube member 23 having an annular flange inside the hollow tube of the core 6 so that the metal material portion appears only on the end face of the core 6. It is attached by the method.

FIG. 8 shows a third embodiment of the core 6 according to the present invention. The core 6 is an ordinary hollow tubular one, and a metal for the pedestal is attached to the end surface of the core in the battery assembling process. 7 illustrates a state in which the member 24 is inserted. According to such a method, the entire upper surface of the core can be used as a pedestal in ultrasonic welding, so that it is a preferable configuration from the viewpoint of facilitating welding work and improving the reliability of welding.

The metal material portion 22, the end metal member 23, and the pedestal metal member 24 on the upper part of the core are made of a material which does not cause a corrosion reaction, a battery reaction, etc. with the metal material of the electrode lead in contact with the pedestal. Is preferred. Further, a heat-resistant material may be used instead of the metal material. In the present invention, the heat resistance means a material having a higher heat resistance than a synthetic resin used as a core.

When the electrode lead is a positive electrode lead,
As the metal material, a material such as aluminum or titanium is preferably used, and various ceramic materials such as alumina and silica can also be used.

In the above description, the case where the core is a hollow body has been described. However, the core may be a rod, and in this case, the entire end of the rod may be used as a pedestal. it can. Even when a rod-shaped body is used as the core, a pedestal metal member may be attached to the end face of the rod during battery assembly.

Next, a method of manufacturing a battery according to the present invention will be described with reference to FIGS. 9 (a) to 9 (e). In the figure, only the upper part of the battery is shown. First, as shown in FIG. 9A, a battery element 7 is accommodated in a battery can 2, and a groove is formed in an upper portion of the battery can 2 so as to protrude inward so as to support a gasket and a battery header. The part 25 is formed.
Further, after injecting a predetermined amount of the electrolytic solution into the battery can, a pedestal metal member 24 serving as a pedestal of a joint is attached to an opening at the center of the core 6. Then, a plurality of internal leads 8
Is bent to form a pedestal metal member 24 at the upper end 10 of the core 6.
Collect on top.

Next, as shown in FIG. 9B, the gasket 15 is mounted on the step 25 of the battery can, and the gasket 15 is
The conductive relay member 9 is inserted into the inside.

Next, as shown in FIG. 9C, the horn 2 of the ultrasonic welding machine is
6, the joint 16 is irradiated with ultrasonic waves to weld the internal lead 8 and the joint 16 of the conductive relay member 9 with the upper surface of the base metal member 24 as the base.

Next, as shown in FIG. 9 (d), the safety valve 11 and the positive electrode terminal 12 whose central portions are made thin are placed on the conductive relay member 9.

Further, as shown in FIG. 9 (e), the upper portion of the battery can 2 is swaged and the conductive connecting portion 1 of the conductive relay member 9 is crimped.
A battery can be made by forming a conductive connection between the battery 6 and the battery header 13 and sealing the battery.

In the above description, it was described that the battery header portion was made of individual parts.
The safety valve 11 and the safety valve 11 may be integrally manufactured in advance and mounted on the conductive relay member 9. Further, the battery header 13 may be provided with a cutoff device that cuts off the current when the internal pressure increases due to an abnormality inside the battery, or a device that cuts off the current when the temperature rises.

In the above description, the battery in which the battery can also serves as the negative electrode terminal and the battery header serves as the positive terminal has been described. However, even if the battery can also serves as the positive electrode terminal and the battery header serves as the negative electrode terminal, It goes without saying that it is possible to form the conductive connection of the negative electrode lead to the battery header in the same manner.

[0049]

As described above, according to the present invention, the plurality of electrode leads attached to the battery element are connected to the conductive relay member inside the battery can using the core of the core of the battery element. After joining, the conductive connection is made by contacting the conductive relay member with the battery header, thereby simplifying the conductive connection process and reducing the IR loss and the like due to the electrode leads for connection with the battery header. Thus, a non-aqueous electrolyte secondary battery with reduced IR loss, large capacity density, and easy to assemble is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a nonaqueous electrolyte secondary battery according to the present invention.

FIG. 2 is a perspective view and a plan view showing a first embodiment of a conductive relay member employed in the battery of the present invention.

FIG. 3 is a perspective view and a plan view showing a second embodiment of a conductive relay member employed in the battery of the present invention.

FIGS. 4A and 4B are a perspective view and a plan view showing a third embodiment of a conductive relay member employed in the battery of the present invention.

FIG. 5 is a perspective view and a plan view showing a fourth embodiment of a conductive relay member employed in the battery of the present invention.

FIG. 6 is a perspective view showing an end of a core according to the first embodiment employed in the battery of the present invention.

FIG. 7 is a sectional view showing an end of a core according to a second embodiment employed in the battery of the present invention.

FIG. 8 is a perspective view showing an end of a core according to a third embodiment employed in the battery of the present invention.

FIG. 9 is a cross-sectional view illustrating a manufacturing process of the battery according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte secondary battery 2 Battery can 3 Positive electrode 4 Negative electrode 5 Separator 6 Core 7 Battery element 8 Positive electrode lead 9 Conductive relay member 10 Upper end part 11 Safety valve 12 Positive terminal 13 Battery header 14 Negative conductive lead 15 Gasket 16 Joint 17 Conductive connection 18 End face 19 Annular conductive connection 20 Truncated conical wall 21 Opening 22 Metal material 23 End metal member 24 Pedestal metal member 25 Step 26 Horn

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI H01M 2/30 H01M 2/30 B (56) References JP-A-10-340714 (JP, A) JP-A-11-260392 ( JP, A) JP-A-9-147821 (JP, A) JP-A-11-307076 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01M 10/40 H01M 2/04 H01M 2/22

Claims (19)

(57) [Claims] 1. A container for accommodating a wound type battery element having a core in a central portion, and a strip-shaped internal lead provided on a sealing side of the container and connected to the battery element, and electrically connected to the container. An external terminal member, which is disposed between the external terminal member and the core, is processed so as to fix the core in the container, and electrically connects the internal lead to the external terminal member. A non-aqueous electrolyte secondary battery comprising: a plate-shaped conductive relay member having a protruding surface that presses the internal lead against an end surface of the core so as to establish a connection. 2. An end face of the core protrudes from the winding end face of the battery element toward the protruding face, and the internal lead is joined between the end face of the core and the protruding face of the relay member. The non-aqueous electrolyte secondary battery according to claim 1, wherein 3. The method according to claim 1, wherein the internal lead is one of a plurality of positive electrode side lead groups and a plurality of negative electrode side lead groups, and the other lead group is connected to an inner surface of the container. The non-aqueous electrolyte secondary battery according to claim 1. 4. The non-aqueous electrolyte secondary battery according to claim 1, wherein a safety valve is interposed between the conductive relay member and the external terminal member. 5. The non-aqueous electrolyte secondary battery according to claim 1, wherein the conductive relay member has an annular flange structure along the inner periphery of the container on a side away from the protruding surface. 6. The conductive member according to claim 5, wherein the conductive relay member has a belt-like member bridging the annular flange structure, and the central portion of the belt-like member constitutes the projecting surface. Non-aqueous electrolyte secondary battery. 7. The non-aqueous electrolyte secondary battery according to claim 5, wherein the conductive relay member has a funnel-like structure, and forms the protruding surface at a central portion. 8. The non-aqueous electrolyte secondary battery according to claim 7, wherein a plurality of holes are provided on an inclined surface between the projecting surface and the annular flange structure. 9. The conductive relay member is a band-shaped member having the protruding surface positioned at the center, and both ends of the band-shaped member are machined into an arc along the inner surface of the container. The non-aqueous electrolyte secondary battery according to claim 1. 10. The non-aqueous electrolyte secondary battery according to claim 1, wherein a heat-resistant member is bonded to an end face of the core. 11. The non-aqueous electrolyte secondary battery according to claim 10, wherein the heat-resistant member is a tubular member whose outer diameter is the same as the outer diameter of the core. 12. The core according to claim 10, wherein the heat-resistant member includes a flange having a cross-sectional area larger than a cross-sectional area of the core, and the flange is connected to an end face of the core. The non-aqueous electrolyte secondary battery according to the above. 13. The heat-resistant member according to claim 10, wherein the heat-resistant member has a coupling portion inserted and coupled to the hollow portion of the core and a pedestal flat portion covering the entire end surface of the core. Non-aqueous electrolyte secondary battery. 14. A projecting support portion for supporting both ends of the conductive relay member via a gasket is formed on a sealing side of the container, and furthermore, both end portions of the external terminal member and the conductive relay member. And a safety valve interposed therebetween to form a battery header, wherein a sealing-side end surface of the container is caulked to electrically connect the internal lead and the external terminal member. 3. The non-aqueous electrolyte secondary battery according to 1. 15. The non-aqueous electrolyte secondary battery according to claim 1, wherein a projecting surface of the conductive relay member is located between a projecting support portion of the container and an end surface of the core. . 16. A wound type battery element having a core in the center and having a positive electrode side internal lead and a negative electrode side internal lead is placed in a container for a battery can such that an end face of the core is exposed to a sealing side. Accommodating, and arranging one of the internal leads on the end surface of the core and joining one of the internal leads to the projecting surface of the conductive relay member with the end surface of the core as a pedestal; Disposing the external terminal member on the sealing side of the container and sealing the external terminal member so that the external terminal member is electrically connected to the end of the conductive relay member. . 17. The method according to claim 17, wherein the joining step is an ultrasonic welding, and further comprising a step of forming a supporting protrusion for supporting the conductive relay member on an inner surface of the container before the ultrasonic welding step. The method for manufacturing a non-aqueous electrolyte secondary battery according to claim 16, wherein the ultrasonic welding is performed while a conductive relay member is held by the support protrusion. 18. A cylindrical gasket is interposed between the supporting protrusion and the conductive relay member, and the external terminal member is placed on the conductive relay member via a safety valve inside the gasket. The non-aqueous electrolysis according to claim 17, further comprising a step of disposing, and a step of caulking an open end of the container together with the gasket to join the external terminal member, the safety valve, and the conductive relay member. A method for manufacturing a liquid secondary battery. 19. A step of forming a pedestal by connecting a heat-resistant member to the end surface of the core before positioning the internal lead on the end surface of the core, and bending the internal lead on the heat-resistant member. The method for producing a non-aqueous electrolyte secondary battery according to claim 18, further comprising a step of disposing.