JP6404045B2 - Lid, electric element, electric element unit, and method of manufacturing lid - Google Patents

Description

  The present invention relates to a lid, an electric element, an electric element unit, and a method for manufacturing the lid.

  Secondary batteries are widely used for automobile applications and the like as represented by lithium ion secondary batteries.

  Such a secondary battery generally has a structure in which a power generation body is accommodated in a bottomed can member (container) having an opening at the top, and the opening of the can member is sealed with a lid (lid body). . Terminal portions are joined to the negative electrode and the positive electrode of the power generator, respectively, and these terminal portions penetrate through the lid and protrude outside, and are fixed to the lid.

Patent Document 1 describes a lid having such a lid and a terminal portion (in the same document, a lithium ion battery lid). The lid described in this document has a plate-like lid, and an aluminum electrode (terminal portion) and a copper electrode (terminal portion) that respectively penetrate the lid.
Here, a portion of the copper electrode penetrating the lid (a portion extending from the inside of the lid to the outside and located in the vicinity of the lid) is covered with an aluminum alloy member.
The gap between the aluminum electrode and the lid and the gap between the copper electrode and the lid are sealed with a molded product of the resin composition.

International Publication No. 2012/070654

  The technique disclosed in Patent Document 1 has the following problems.

  (1) In the technique of Patent Document 1, the entire aluminum electrode has a structure integrally formed of aluminum, and the entire copper electrode has a structure integrally formed of copper. That is, both the aluminum electrode and the copper electrode have a structure in which an external terminal (terminal located outside the lid) and an internal terminal (terminal located inside the lid) are integrally formed. For this reason, when the external terminal side or the internal terminal side is of a wide variety (there are many variations in shape), it is necessary to manufacture a large number of integrated electrodes (terminal portions) corresponding to each design.

  (2) In the technique of Patent Document 1, the external terminal of the aluminum electrode is made of aluminum, and the external terminal of the copper electrode is made of copper. For this reason, when a plurality of secondary batteries are connected in series to form an assembled battery (unitized), it is necessary to connect external terminals made of aluminum and external terminals made of copper to each other via a bus bar. However, since it is necessary to use an expensive bus bar made of a clad material having an aluminum portion and a copper portion in order to connect aluminum and copper to each other, the cost is increased.

  Therefore, a lid having a structure capable of solving at least one of the problems described in (1) and (2) above is desired.

In other words, an example of a problem to be solved by the present invention is that a lid body, an electric terminal having a structure in which a plurality of types of internal terminals or external terminals can be joined to a common external terminal or internal terminal to form a terminal portion. It is to provide an element (secondary battery or the like) and an electric element unit, and to provide a lid manufacturing method capable of manufacturing a lid having such a structure.
Another example of the problem to be solved by the present invention is a lid having a structure that does not require the use of a bus bar made of a clad material when a plurality of electric elements (secondary batteries, etc.) are connected in series to form a unit. It is providing a body, an electric element (secondary battery etc.), and an electric element unit, and providing the manufacturing method of the cover body which can manufacture the cover body of such a structure.

The present invention
A lid attached to an opening of a container for storing a power generator or a power storage body,
A lid body covering the opening;
A first terminal portion and a second terminal portion, each of which is disposed through a through-hole formed in the lid body,
A resin member that seals a gap between the second terminal portion and the lid body, and fixes the second terminal portion to the lid body;
With
The first terminal portion is
A first external terminal located on one side with respect to the lid body;
A first internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
Including
The second terminal portion is
A second external terminal located on one side with respect to the lid body;
A second internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
As well as
The second terminal portion is
A first metal member having the second external terminal;
A second metal member having the second internal terminal;
Have
The first metal member and the second metal member are joined to each other at a joint portion,
The joint is covered with the resin member ;
The first metal member and the second metal member are fitted and fixed to each other at the joint, and are configured to be fitted and fixed to each other before being fitted and fixed . Provide the body.

The present invention also provides:
A container having an opening;
A lid attached to the opening of the container;
A power generator or a power storage unit housed in the container;
An electrical element comprising:
The lid is
A lid body covering the opening;
A first terminal portion and a second terminal portion, each of which is disposed through a through-hole formed in the lid body,
A resin member that seals a gap between the second terminal portion and the lid body, and fixes the second terminal portion to the lid body;
With
The first terminal portion is
A first external terminal located on one side with respect to the lid body;
A first internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
Including
The second terminal portion is
A second external terminal located on one side with respect to the lid body;
A second internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
As well as
The second terminal portion is
A first metal member having the second external terminal;
A second metal member having the second internal terminal;
Have
The first metal member and the second metal member are made of different metals,
The first metal member and the second metal member are joined to each other at a joint portion,
The joint is covered with the resin member ;
The first metal member and the second metal member are fitted and fixed to each other at the joint, and are configured to be fitted and fixed to each other before being fitted and fixed . An element is provided.

The present invention also provides:
A plurality of electrical elements;
A connection terminal portion electrically connecting the plurality of electrical elements to each other;
An electrical element unit comprising:
Each of the plurality of electrical elements is
A container having an opening;
A lid attached to the opening of the container;
A power generator or a power storage unit housed in the container;
With
The lid is
A lid body covering the opening;
A first terminal portion and a second terminal portion, each of which is disposed through a through-hole formed in the lid body,
A resin member that seals a gap between the second terminal portion and the lid body, and fixes the second terminal portion to the lid body;
With
The first terminal portion is
A first external terminal located on one side with respect to the lid body;
A first internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
Including
The second terminal portion is
A second external terminal located on one side with respect to the lid body;
A second internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
As well as
The second terminal portion is
A first metal member having the second external terminal;
A second metal member having the second internal terminal;
Have
The first metal member and the second metal member are joined to each other at a joint portion,
The joint is covered with the resin member;
The first metal member and the second metal member are made of different metals,
The first metal member, the first terminal portion and the connection terminal portion are made of the same kind of metal ,
The first metal member and the second metal member are fitted and fixed to each other at the joint, and are configured to be fitted and fixed to each other before being fitted and fixed . An element unit is provided.

The present invention also provides:
A method of manufacturing a lid attached to an opening of a container that houses a power generator or a power storage unit,
The lid is
A lid body covering the opening;
A first terminal portion and a second terminal portion, each of which is disposed through a through-hole formed in the lid body,
A resin member that seals a gap between the second terminal portion and the lid body, and fixes the second terminal portion to the lid body;
With
The first terminal portion is
A first external terminal located on one side with respect to the lid body;
A first internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
Including
The second terminal portion is
A second external terminal located on one side with respect to the lid body;
A second internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
As well as
The second terminal portion is
A first metal member having the second external terminal;
A second metal member having the second internal terminal;
Have
The manufacturing method is
Fitting and fixing the first metal member and the second metal member to each other;
Molding the resin member in a state where the second terminal portion is disposed so that the second terminal portion is in a state of passing through the through hole;
With
In the step of molding the resin member, a gap between the second terminal portion and the lid body is sealed by the resin member, and the second terminal portion is fixed to the lid body by the resin member. And the resin member is molded so that the joint portion between the first metal member and the second metal member is covered with the resin member ,
The first metal member and the second metal member, before being fitted and fixed, to provide a method of manufacturing a lid that has a shape as fitted and fixed to each other.

According to the present invention, it is possible to form a terminal portion by joining a plurality of types of internal terminals or external terminals to a common external terminal or internal terminal, or to form a plurality of electrical elements. In the case of unit connection by series connection, a structure that can eliminate the need to use a bus bar made of a clad material can be obtained.
Moreover, according to this invention, the cover body of such a structure can be manufactured.

It is a figure which shows the cover body which concerns on 1st Embodiment, Among these, (a) is a front view, (b) is front sectional drawing. It is a figure which shows the electric element which concerns on 1st Embodiment, Among these, (a) is a disassembled perspective view, (b) is a perspective view. It is a figure which shows the 2nd terminal part of the cover which concerns on 1st Embodiment, Among these, (a) is a perspective view, (b) is a front view. It is a figure which shows the process of manufacturing the 2nd terminal part of the cover which concerns on 1st Embodiment. It is the elements on larger scale of FIG.1 (b). It is a perspective view of the electric element unit which concerns on 1st Embodiment. It is a front view of the 2nd terminal part of the lid concerning a modification of a 1st embodiment, among these, (a) shows the 1st modification and (b) shows the 2nd modification. It is a figure which shows the 2nd terminal part of the cover which concerns on 2nd Embodiment, Among these, (a) is a disassembled perspective view before joining, (b) is a perspective view which shows the structure after joining, (c) is It is a front view of the state fixed to the lid body via the resin member. It is a figure which shows the 2nd terminal part of the cover which concerns on 3rd Embodiment, Among these, (a) is a disassembled perspective view before joining, (b) is a perspective view which shows the structure after joining, (c) is It is a front view of the state fixed to the lid body via the resin member. It is a figure which shows the 2nd terminal part of the cover which concerns on 4th Embodiment, (a) is an exploded perspective view before joining, (b) is an exploded side sectional view before joining, (c) is joined. The side sectional view showing the latter structure, (d) is a side sectional view in a state of being fixed to the lid body via a resin member. It is a figure which shows the 2nd terminal part of the cover which concerns on 5th Embodiment, among these, (a) is an exploded perspective view before joining, (b) is an exploded front view before joining, (c) is after joining. (D) is a front sectional view in a state of being fixed to the lid body via a resin member. It is a figure which shows the 2nd terminal part of the cover which concerns on 6th Embodiment, (a) is an exploded perspective view before joining, (b) is a perspective view which shows the structure after joining, (c) is the figure. It is a front view of the state fixed to the lid body via the resin member. It is a front sectional view showing the lid concerning a 7th embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

[First Embodiment]
FIG. 1 is a view showing a lid 100 according to the first embodiment, in which (a) is a front view and (b) is a front sectional view.
2A and 2B are diagrams showing the electric element 200 according to the first embodiment, in which FIG. 2A is an exploded perspective view and FIG. 2B is a perspective view. 2A, the illustration of the stopper 15 is omitted, and instead, the liquid injection hole 11 that is closed by the stopper 15 is shown.
3A and 3B are diagrams showing the negative electrode terminal portion (second terminal portion) 30 of the lid 100 according to the first embodiment, in which FIG. 3A is a perspective view and FIG. 3B is a front view.
4A and 4B are diagrams illustrating a process of manufacturing the negative electrode terminal portion 30 of the lid 100 according to the first embodiment.
FIG. 5 is a partially enlarged view of FIG.
FIG. 6 is a perspective view of the electric element unit 300 according to the first embodiment.

The lid 100 according to the present embodiment is a lid 100 that is attached to an opening 210a of a container (for example, a can member 210) that houses a power generator 220 or a power storage unit.
The lid body 100 includes a lid body 10 that covers the opening 210a, and a first terminal portion (for example, the positive electrode terminal portion 20) and a second terminal that are disposed through the through holes 13 and 14 formed in the lid body 10, respectively. A resin member (second resin member) that seals a gap between the terminal portion (for example, the negative electrode terminal portion 30), the second terminal portion, and the lid body 10 and fixes the second terminal portion to the lid body 10 50).
The first terminal portion is a first external terminal located on one side (upper side) with respect to the lid body 10 and a power generator 220 or a power storage body located on the other side (lower side) with the lid body 10 as a reference. Is electrically connected to the first internal terminal. The first external terminal is constituted by a part of the top surface portion 22 described later, for example. Further, the first internal terminal is constituted by a part of an inner arrangement portion 21a of the lead portion 21 described later, for example.
The second terminal portion is a second external terminal located on one side (upper side) with respect to the lid body 10 and a power generator 220 or a power storage body located on the other side (lower side) with the lid body 10 as a reference. Are electrically connected to each other. Note that the second external terminal is configured by, for example, a part of the top surface portion 32 described later. Further, the second internal terminal is constituted by a part of an inner arrangement portion 31a of the lead portion 31 described later, for example.
The 2nd terminal part has the 1st metal member 35 which has the 2nd external terminal, and the 2nd metal member 36 which has the 2nd internal terminal.
The first metal member 35 and the second metal member 36 are joined to each other at a joint portion 37, and the joint portion 37 is covered with a resin member.

As shown in FIG. 2, the electrical element 200 according to the present embodiment includes a container (for example, a can member 210) having an opening 210 a, a lid 100 attached to the opening 210 a of the container, and a container. A power generator 220 or a power storage unit housed therein.
The lid 100 of the electric element 200 is the lid 100 according to the present embodiment.
The power generator 220 or the power storage body is electrically connected to the first internal terminal and the second internal terminal, respectively.

As shown in FIG. 6, the electrical element unit 300 according to the present embodiment includes a plurality of electrical elements 200 and connection terminal portions (for example, bus bars 310) that electrically connect the plurality of electrical elements 200 to each other. ).
Each of the plurality of electric elements 200 is the electric element 200 according to the present embodiment.
The first metal member 35 and the second metal member 36 are made of different metals.
And the 1st metal member 35, the 1st terminal part (for example, positive electrode terminal part 20), and the connection terminal part are mutually comprised with the same kind of metal.

The lid manufacturing method according to the present embodiment is a method for manufacturing the lid 100 according to the present embodiment.
In this manufacturing method, the first metal member 35 and the second metal member 36 are joined to each other, and the second terminal portion (for example, the negative electrode terminal portion 30) passes through the through hole (second through hole 14). And a step of molding the resin member (second resin member 50) in a state where the second terminal portion is arranged so as to be.
In the step of molding the resin member, the gap between the second terminal portion and the lid body 10 is sealed by the resin member, the second terminal portion is fixed to the lid body 10 by the resin member, and the first The resin member is molded such that the joint portion 37 between the metal member 35 and the second metal member 36 is covered with the resin member.

  Details will be described below.

  In the present specification, the upper and lower positional relationship of each component in the electric element 200 will be described as the positional relationship when the electric element 200 is placed upright on a horizontal surface. However, this positional relationship does not necessarily coincide with the positional relationship when the electric element 200 is manufactured, used, stored, transported, or the like.

  First, with reference to FIG. 2, the structure in the case where the electric element 200 according to the present embodiment is a secondary battery will be described in detail.

  The electric element 200 is, for example, a rectangular can type lithium ion secondary battery, and can member 210, lid body 10, power generation body 220, positive electrode terminal portion 20, negative electrode terminal portion 30, and first resin member. 40, the 2nd resin member 50, and the stopper 15 (FIG.2 (b)).

  The can member 210 is formed in a rectangular parallelepiped shape, for example. The can member 210 is formed in a bottomed box shape having an opening 210a at one end thereof. The can member 210 is made of, for example, a metal material such as an aluminum alloy.

  Here, the lid body 100 is constituted by the lid body 10, the positive terminal portion 20, the negative terminal portion 30, the first resin member 40, and the second resin member 50.

The lid body 10 is made of a metal material such as an aluminum alloy, for example. The lid body 10 is formed in a flat plate shape, for example. The lid body 10 is sealed by sealing the opening 210 a by joining the peripheral edge of the lid body 10 to the edge of the opening 210 a of the can member 210. Here, the lid body 10 is formed with a step portion 17 for allowing the lower end of the lid body 10 to be fitted into the can member 210, for example, over the entire circumference of the lid body 10. As a result, the flat area of the portion below the step portion 17 in the lid main body 10 is smaller than the flat area of the portion above the step portion 17 in the lid main body 10. The lid body 10 is fixed to the can member 210 by welding or the like with the portion of the lid body 10 below the stepped portion 17 fitted into the inside of the can member 210 from the opening 210a of the can member 210. Yes.
An electrolyte solution is accommodated in the battery internal region determined by the can member 210 and the lid body 10. The lid body 10 has a first through hole 13 (FIG. 1B) through which the positive terminal portion 20 is inserted and a second through hole 14 (FIG. 1B) through which the negative terminal portion 30 is inserted. It is formed through the front and back of the lid body 10.

The lid body 10 is further formed with a liquid injection hole 11 for injecting an electrolytic solution into the can member 210 and a pressure release valve 12 for releasing gas to the outside of the electric element 200.
The liquid injection hole 11 is sealed by a plug 15 (FIG. 2B) provided in the liquid injection hole 11. In addition, the plug 15 is not provided in the liquid injection hole 11 in a state before the lid 100 is fixed to the can member 210.
The pressure release valve 12 is formed thinner than the portion other than the pressure release valve 12 in the lid body 10, and breaks when the pressure in the battery internal region determined by the lid body 10 and the can member 210 increases. Gas is emitted.

  The positive terminal portion 20 is disposed through the first through hole 13, and the negative terminal portion 30 is disposed through the second through hole 14 (see FIG. 1B).

  Here, the structure of the negative electrode terminal portion 30 will be described in detail.

As shown in FIG. 3, the negative electrode terminal portion 30 includes, for example, a flat plate-like top surface portion 32 and a lead portion 31 that hangs downward from the top surface portion 32. The lead part 31 is formed in, for example, an elongated (rod-like) plate shape. The longitudinal direction of the lead portion 31 extends in a direction intersecting with the plate surface of the top surface portion 32 (for example, a direction orthogonal).
The lead portion 31 is inserted through the second through hole 14 and penetrates the lid body 10, and the longitudinal direction of the lead portion 31 extends in a direction intersecting the lid body 10 (for example, a direction orthogonal thereto). (FIG. 1B).
The lead portion 31 includes an inner arrangement portion 31a disposed on the lower side (that is, the battery internal region) with respect to the lid body 10 and an upper side (that is, the region outside the battery internal region) with respect to the lid body 10. And an outer arrangement portion 31b (see FIG. 1B).
The top surface portion 32 is disposed above the lid body 10 and is separated from the lid body 10 and faces the lid body 10 (for example, faces in parallel).
A part of the top surface portion 32 constitutes a second external terminal. More specifically, for example, the second external terminal is configured by the upper surface of the top surface portion 32.
A part of the inner arrangement portion 31a of the lead portion 31 constitutes a second internal terminal to which the power generator 220 is electrically connected.

  The negative electrode terminal portion 30 includes a first metal member 35 having a second external terminal and a second metal member 36 having a second internal terminal.

Among these, the first metal member 35 includes the top surface portion 32 and a plate-like portion that hangs downward from the top surface portion 32.
In the first metal member 35, a plate-like portion that hangs downward from the top surface portion 32 is inserted into the second through hole 14 and penetrates the lid body 10.

Here, in the first metal member 35, the plate-like portion that hangs downward from the top surface portion 32 constitutes the upper end portion of the lead portion 31. Note that the upper end portion of the lead portion 31 includes an outer arrangement portion 31b and an upper end portion of the inner arrangement portion 31a.
On the other hand, the 2nd metal member 36 comprises the part except the upper end part in the inner side arrangement | positioning part 31a. That is, the second metal member 36 constitutes a portion excluding the upper end portion of the lead portion 31.

  The first metal member 35 and the second metal member 36 are joined to each other at the joint portion 37. As a result, the second metal member 36 is connected to the lower portion of the plate-like portion that hangs downward from the top surface portion 32 of the first metal member 35. The plate-like portion that hangs downward from the top surface portion 32 of the first metal member 35 and the second metal member 36 constitute a continuous long plate-like portion.

  In the case of this embodiment, the first metal member 35 and the second metal member 36 are mechanically joined to each other at the joint portion 37. More specifically, the first metal member 35 and the second metal member 36 are fitted and fixed to each other at the joint portion 37.

The second metal member 36 has, for example, a fitting protrusion 38 protruding upward at the upper end. On the other hand, the 1st metal member 35 has the fitting recessed part 39 by which the fitting protrusion part 38 was inserted by the lower end part.
The fitting recess 39 opens at least downward, and opens on one surface of a plate-like portion that hangs downward from the top surface portion 32 of the first metal member 35.
More specifically, the fitting recess 39 is a notch-shaped portion penetrating the front and back of the plate-like portion that hangs downward from the top surface portion 32 in the first metal member 35, and both of the plate-like portions. Is open on the surface.

For example, the base end portion of the fitting protrusion 38 is constricted. That is, the fitting protrusion 38 has a small dimension part 38a having a relatively small width dimension at the base end part, and a small large dimension part 38b including a part having a larger width dimension than the small dimension part 38a. It has above the dimension part 38a.
In the case of the present embodiment, the fitting protrusion 38 is formed in an arrow shape.
On the other hand, the fitting recess 39 has a small dimension part 39a in which the small dimension part 38a is inserted, and a large dimension part 39b in which the large dimension part 38b is inserted.
As described above, the fitting protrusion 38 having the small size portion 38a and the large size portion 38b is fitted into the fitting recess 39 having the small size portion 39a and the large size portion 39b, whereby the second metal member. 36 is restricted from dropping downward from the first metal member 35 (that is, prevented from falling downward).

In addition, the 2nd metal member 36 is formed in the flat plate shape as a whole including the fitting protrusion part 38, for example.
The plate thickness of the second metal member 36 is preferably equal to the plate thickness of the plate-like portion that hangs downward from the top surface portion 32 in the first metal member 35.

  The negative terminal portion 30 is configured as described above.

Here, a method of fitting and fixing the fitting protrusion 38 and the fitting recess 39 will be described.
For example, as shown in FIG. 4A, in the state where the fitting protrusion 38 and the fitting recess 39 are aligned with each other, the fitting protrusion 38 is moved to the second position using a striking tool such as a plastic hammer. The metal member 36 is hit in a direction perpendicular to the plate surface direction. Thereby, the fitting projection 38 can be press-fitted into the fitting recess 39, and the fitting projection 38 and the fitting recess 39 can be fitted to each other.
Or conversely, fitting is also possible by hitting the peripheral edge portion of the fitting recess 39 in the first metal member 35 and press-fitting the fitting protrusion 38 into the fitting recess 39.
Here, until the front and back surfaces of the second metal member 36 are flush with the front and back surfaces of the plate-like portion that hangs downward from the top surface portion 32 of the first metal member 35, the fitting protrusions 38 are arranged. It is preferable to press-fit into the fitting recess 39 (see FIG. 4B).
In addition, by forming the fitting protrusion 38 and the fitting recess 39 so that the outer dimension of the fitting protrusion 38 is slightly larger than the inner region of the fitting recess 39 in a state before joining, The joint strength between the fitting projection 38 and the fitting recess 39 can be sufficiently secured, and the contact resistance at the joint 37 between the fitting projection 38 and the fitting recess 39 can be easily reduced. .

On the other hand, the positive electrode terminal portion 20 is formed to have an outer shape equivalent to that of the negative electrode terminal portion 30. Specifically, for example, the positive electrode terminal portion 20 is formed symmetrically with the negative electrode terminal portion 30. Yes.
However, in the present embodiment, the entire positive electrode terminal portion 20 is integrally formed. For this reason, the positive electrode terminal portion 20 does not have a portion corresponding to the joint portion 37 of the negative electrode terminal portion 30.

As shown in FIG. 1, the positive electrode terminal portion 20 includes, for example, a flat plate-shaped top surface portion 22 and a lead portion 21 that hangs downward from the top surface portion 22. The lead portion 21 is formed in, for example, an elongated plate shape. The longitudinal direction of the lead portion 21 extends in a direction intersecting with the plate surface of the top surface portion 22 (for example, a direction orthogonal).
The lead portion 21 is inserted through the first through hole 13 and penetrates the lid main body 10, and the longitudinal direction of the lead portion 21 extends in a direction intersecting the lid main body 10 (for example, a direction orthogonal thereto). ing.
The lead portion 21 is arranged on the lower side (that is, the battery internal region) with respect to the lid body 10 and on the upper side (that is, the region outside the battery internal region) with respect to the lid body 10. And an outer arrangement portion 21b arranged on the outer side (see FIG. 1B).
The top surface portion 22 is disposed above the lid body 10 and is separated from the lid body 10 and faces the lid body 10 (for example, faces in parallel).
A part of the top surface portion 22 constitutes a first external terminal. More specifically, for example, the first external terminal is configured by the upper surface of the top surface portion 22.
Further, a part of the inner arrangement portion 21a of the lead portion 21 constitutes a first internal terminal to which the power generator 220 is electrically connected.

Here, the metal material which comprises each part of the electric element 200 is demonstrated.
In the present embodiment, the first metal member 35 and the second metal member 36 of the negative electrode terminal portion 30 are made of different metals.
On the other hand, the first metal member 35 and the positive electrode terminal portion 20 are made of the same kind of metal.
Furthermore, the lid body 10 is also made of the same type of metal as the first metal member 35 and the positive electrode terminal portion 20, for example. Further, the can member 210 is made of, for example, the same kind of metal as the lid body 10.

More specifically, the first metal member 35 and the positive electrode terminal portion 20 are each made of aluminum or an aluminum alloy, and the second metal member 36 is made of copper or a copper alloy.
The lid body 10 and the can member 210 are each made of aluminum or an aluminum alloy.

In this specification, aluminum and an aluminum alloy are aluminum-based metals, respectively, and are the same type in that sense.
Similarly, copper and a copper alloy are each a copper-based metal, and in this sense, are the same type.
On the other hand, aluminum is different from copper and copper alloy, and aluminum alloy is also different from copper and copper alloy.
Similarly, copper is different from aluminum and aluminum alloy, and copper alloy is also different from aluminum and aluminum alloy.

As shown in FIG. 1B, the positive electrode terminal portion 20 is fixed to the edge portion of the first through hole 13 in the lid body 10 via the first resin member 40.
The first resin member 40 insulates the positive electrode terminal portion 20 and the lid main body 10 from each other and seals the gap between the positive electrode terminal portion 20 and the lid main body 10. That is, the first resin member 40 functions as a sealing material that seals the first through hole 13.
Further, the negative electrode terminal portion 30 is fixed to the edge portion of the second through hole 14 in the lid body 10 via the second resin member 50.
The second resin member 50 insulates the negative electrode terminal portion 30 and the lid main body 10 from each other and seals the gap between the negative electrode terminal portion 30 and the lid main body 10. That is, the second resin member 50 functions as a sealing material that seals the second through hole 14.

More specifically, as shown in FIG. 5, the second resin member 50 surrounds the periphery of the joint portion 37 and covers the entire joint portion 37. Thereby, the junction part 37 is reinforced.
More specifically, for example, the second resin member 50 is from a position above the upper end 36a of the second metal member 36 (that is, the upper end of the fitting protrusion 38) from the lower end 35a of the first metal member 35. Further, the periphery of the negative electrode terminal portion 30 is covered to the lower position.
As can be seen from the above description, the fitting protrusion 38 and the fitting recess 39 are fitted by relatively moving the first metal member 35 and the second metal member 36 in one direction. It has been realized. Since the joint portion 37 having such a structure is reinforced by the second resin member 50, the mutual separation between the fitting protrusion 38 and the fitting recess 39 is suppressed.

  For example, the second resin member 50 not only covers the periphery of the joint portion 37 but also fills the gap between the negative electrode terminal portion 30 and the lid body 10 and covers the periphery of the outer arrangement portion 31b. ing. Further, the second resin member 50 is also filled in the gap between the top surface portion 32 and the lid body 10. Specifically, for example, the upper surface of the second resin member 50 is flush with the top surface portion 32.

Here, the first metal member 35 is disposed so as to penetrate the second through hole 14, and a part of the first metal member 35 and the joint portion 37 are on the other side (the lid) with respect to the lid body 10. It is located on the lower side of the main body 10.
In the first metal member 35, the entire surface of the portion located on the lower side of the lid body 10 is covered with the second resin member 50.
In other words, the portion exposed from the second resin member 50 among the portions located in the battery inner region in the negative electrode terminal portion 30 is entirely composed of the same kind of metal (for example, copper or copper alloy). Has been.

Further, the first resin member 40 is a portion having the same shape as the second resin member 50 and is formed symmetrically with the second resin member 50.
The first resin member 40 covers the positive electrode terminal portion 20 in the same manner as the second resin member 50 covers the negative electrode terminal portion 30.

  That is, as shown in FIG. 1B, the first resin member 40 covers, for example, the periphery of the upper end portion of the inner arrangement portion 21a and is filled in the gap between the positive electrode terminal portion 20 and the lid body 10. And covers the periphery of the outer placement portion 21b. Further, the first resin member 40 is also filled in the gap between the top surface portion 22 and the lid body 10. Specifically, for example, the upper surface of the first resin member 40 is flush with the top surface portion 22.

  The 1st resin member 40 and the 2nd resin member 50 are comprised, for example with the thermoplastic resin composition, respectively. This thermoplastic resin composition is made of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, fluorine resin, acrylic resin, polyamide, polyimide, acetal resin, polycarbonate, polyphenylene oxide, polyphenylene sulfide, polyester, and polysulfone. Contains at least one selected thermoplastic resin.

Note that fine irregularities are formed on the surface of the negative electrode terminal portion 30, and the surface on which the fine irregularities are formed is covered with the second resin member 50. Specifically, for example, on the surface of at least one of the first metal member 35 and the second metal member 36 (either the first metal member 35 or the second metal member 36 or both). Have fine irregularities formed over the entire surface of the member. Alternatively, the surface of at least one of the first metal member 35 and the second metal member 36 is selectively fine with respect to a region including at least a region where the second resin member 50 is joined. Unevenness is formed. And the 2nd resin member 50 is joined with respect to the surface in which at least any one of the 1st metal member 35 and the 2nd metal member 36 was formed with the fine unevenness | corrugation.
Similarly, fine irregularities are formed on the surface of the positive electrode terminal portion 20, and the surface on which the fine irregularities are formed is covered with the first resin member 40. Specifically, for example, the entire surface of the surface of the positive electrode terminal portion 20 or the region including at least the region where the first resin member 40 is bonded to the surface of the positive electrode terminal portion 20 is selectively used. Fine irregularities are formed, and the first resin member 40 is bonded to the surface on which the fine irregularities are formed.

The power generator 220 is a so-called jelly roll. Although not shown, the power generator 220 is laminated in the order of the first separator, the negative electrode layer, the second separator, and the positive electrode layer, and the first separator, the negative electrode layer, the second separator, and the positive electrode layer are wound together. It is the wound electrode group comprised by this.
The negative electrode layer is configured to include a negative electrode active material, and the positive electrode layer is configured to include a positive electrode active material.
The power generator 220 (wound electrode group) has a negative electrode at one end and a positive electrode at the other end.

  The number of power generators 220 included in the electric element 200 may be one or more. In the case of the present embodiment, the electric element 200 includes, for example, a single power generator 220.

The negative electrode of the power generator 220 is joined to the second internal terminal.
On the other hand, the positive electrode of the power generator 220 is joined to the first internal terminal.
For this reason, the power generator 220 is constructed from the inner arrangement part 31a of the lead part 31 of the negative electrode terminal part 30 to the inner arrangement part 21a of the lead part 21 of the positive electrode terminal part 20 (FIG. 2A).

The lid body 10 is formed to be long in one direction (the left-right direction in FIG. 1), for example. The first resin member 40 and the positive terminal portion 20 are provided at one end in the longitudinal direction of the lid body 10, and the second resin member 50 and the negative terminal portion are disposed at the other end in the longitudinal direction of the lid body 10. 30 is provided.
Further, the can member 210 is formed in a planar shape equivalent to the lid body 10. That is, the can member 210 is formed in, for example, a flat rectangular parallelepiped shape.
Hereinafter, the longitudinal direction of the lid body 10 is referred to as the width direction of the electric element 200. Further, the direction along the plate surface direction of the lid body 10 and orthogonal to the width direction is referred to as the depth direction of the electric element 200.

  Next, the structure of the electric element unit 300 will be described.

As shown in FIG. 6, the electric element unit 300 includes a plurality of electric elements 200, and the plurality of electric elements 200 are electrically connected to each other in series via a bus bar 310. In the present embodiment, since the electric element 200 is a secondary battery, the electric element unit 300 is an assembled battery.
Here, it is assumed that the electric element unit 300 includes three electric elements 200, that is, an electric element 200a, an electric element 200b, and an electric element 200c.

In the depth direction of the electric element 200a, the electric element 200a, the electric element 200b, and the electric element 200c are arranged in this order.
In addition, the depth direction of each electric element 200a-200c corresponds mutually, and the width direction of each electric element 200a-200c is mutually parallel. Moreover, the position in the width direction of each electric element 200a-200c is equal.
However, among the electric elements 200a to 200c, the electric elements 200 adjacent to each other are arranged with their directions in the width direction reversed. In other words, the electric elements 200a to 200c are arranged by alternately reversing the direction in the width direction.
That is, for the electric elements 200a and 200b on both sides, the positive electrode terminal portion 20 is disposed on the left side in FIG. 6 and the negative electrode terminal portion 30 is disposed on the right side, whereas the electric element 200b is illustrated in FIG. The negative electrode terminal part 30 is arrange | positioned at the left side, and the positive electrode terminal part 20 is arrange | positioned at the right side.

The positive electrode terminal portion 20 of the electric element 200a and the negative electrode terminal portion 30 of the electric element 200b are electrically connected to each other via the bus bar 310, and the positive electrode terminal portion 20 of the electric element 200b and the electric element 200c are electrically connected. The negative terminal portion 30 is electrically connected to each other via the bus bar 310.
More specifically, the upper surface (that is, the first external terminal) of the top surface portion 22 of the positive electrode terminal portion 20 of the electric element 200a and the upper surface (that is, the second external terminal) of the top surface portion 32 of the negative electrode terminal portion 30 of the electric element 200b. Are joined to each other via a bus bar 310. Further, the upper surface of the top surface portion 22 (that is, the first external terminal) of the positive electrode terminal portion 20 of the electric element 200b and the upper surface of the top surface portion 32 (that is, the second external terminal) of the negative electrode terminal portion 30 of the electric element 200c are the bus bar 310. Are joined to each other.

  The bus bar 310 is a plate-like member that is long in one direction, and the whole is made of aluminum or an aluminum alloy. That is, the bus bar 310 is made of the same type of metal as the first metal member 35 and the positive terminal portion 20.

  Next, an example of a method for manufacturing the electric element unit 300 will be described. The method for manufacturing the electric element unit 300 includes a method for manufacturing the electric element 200 and a method for manufacturing the lid 100.

  First, the positive terminal portion 20 is prepared.

Moreover, the negative electrode terminal part 30 is prepared.
In the negative electrode terminal 30, after the first metal member 35 and the second metal member 36 are separately manufactured, the first metal member 35 and the second metal member 36 are bonded to each other by the method described with reference to FIG. It can produce by doing.
In other words, in the step of joining the first metal member 35 and the second metal member 36 to each other, the first metal member 35 and the second metal member 36 are formed on one of the first metal member 35 and the second metal member 36 (for example, the second metal member 36). Press fitting the protrusion (fitting protrusion 38) into a recess (fitting recess 39) formed in one of the first metal member 35 and the second metal member 36 (for example, the first metal member 35). Thus, the first metal member 35 and the second metal member 36 are fitted and fixed to each other.

  Next, the process which roughens the surface of the positive electrode terminal part 20 and the negative electrode terminal part 30 is performed. Thereby, fine irregularities are formed on the surfaces of the positive electrode terminal portion 20 and the negative electrode terminal portion 30.

Next, the first resin member 40 and the second resin member 50 are molded, and the positive terminal portion 20 and the negative terminal portion 30 are fixed to the lid body 10 by the first resin member 40 and the second resin member 50.
More specifically, for example, the positive electrode terminal portion 20 penetrates the lid body 10 by inserting the positive electrode terminal portion 20 into the first through hole 13, and the negative electrode terminal portion 30 is inserted into the second through hole 14. The negative electrode terminal portion 30 penetrates the lid body 10 by being inserted. And in this state, the 1st resin member 40 and the 2nd resin member 50 are shape | molded collectively by injection-molding a thermoplastic resin composition.
In this step, the first resin member 40 and the second resin member 50 are collectively put in a state where the positive electrode terminal portion 20 and the negative electrode terminal portion 30 are fixed to a mold for insert molding or a mold for outsert molding (not shown). And formed by injection molding. That is, insert molding or outsert molding is performed as injection molding.
In addition, since the fine unevenness | corrugation is previously formed in the surface of the positive electrode terminal part 20 and the negative electrode terminal part 30, joining strength of the 1st resin member 40 with respect to the positive electrode terminal part 20, and 2nd resin with respect to the negative electrode terminal part 30 The joining strength of the member 50 can be sufficiently obtained.

  Thus, the lid 100 is obtained (FIG. 1).

Next, the power generator 220 is joined to the first internal terminal of the positive electrode terminal portion 20 and the second internal terminal of the negative electrode terminal portion 30. The power generation body 220 can be joined to the first internal terminal and the second internal terminal by, for example, ultrasonic welding (ultrasonic welding).
Thereby, as shown in the upper part of FIG. 2A, a structure in which the lid 100 and the power generation body 220 are joined can be obtained.

  Next, the power generator 220, the inner arrangement portion 21 a of the lead portion 21 of the positive electrode terminal portion 20, the inner arrangement portion 31 a of the lead portion 31 of the negative electrode terminal portion 30, and the lower portion of the first resin member 40 than the lid body 10. And the part below the lid body 10 in the second resin member 50 is inserted into the can member 210.

  Then, the peripheral edge of the lid body 10 is bonded to the edge of the opening 210a of the can member 210 and sealed. This joining is performed by welding by irradiating a laser beam, for example.

  Next, an electrolytic solution is injected into the can member 210 through the injection hole 11. Next, a plug 15 is provided in the liquid injection hole 11, and the plug 15 is joined to the edge of the liquid injection hole 11 in the lid body 10. This joining is performed by welding by irradiating a laser beam, for example.

In this way, the electric element 200 is obtained (FIG. 2B).
In addition, a plurality of electric elements 200 are manufactured by the same process.

Next, the plurality of electric elements 200 are arranged in the orientation shown in FIG. 6, and the plurality of electric elements 200 are electrically connected to each other in series via the bus bar 310.
Here, the bus bar 310 has one end joined to the first external terminal and the other end joined to the second external terminal. These joining is performed by welding by irradiating a laser beam, for example.

According to the first embodiment as described above, the lid body 100 seals the gap between the negative electrode terminal portion 30 and the lid main body 10, and fixes the negative electrode terminal portion 30 to the lid main body 10. Two resin members 50 are provided.
Further, the negative electrode terminal portion 30 includes a second external terminal on the upper side of the lid body 10 and a second internal terminal located on the lower side of the lid body 10 and electrically connected to the power generator 220. .
Further, the negative electrode terminal portion 30 includes a first metal member 35 having a second external terminal and a second metal member 36 having a second internal terminal.
The first metal member 35 and the second metal member 36 are joined to each other at the joint portion 37.

That is, the structure of the lid body 100 is configured such that a plurality of types of second metal members 36 or first metal members 35 are joined to the common first metal member 35 or second metal member 36 to form the negative electrode terminal portion 30. It is a possible structure.
For this reason, the second metal member 36 having the second internal terminal is manufactured in a wide variety and has many variations, while the first metal member 35 common to the multiple types of second metal members 36 is provided. Can be connected and used.
Similarly, the first metal member 35 having the second external terminal is manufactured in various types and has many variations, while the first metal member 35 common to these various types of first metal members 35 is provided. Can also be used.

  Here, since the joint portion 37 is covered by the second resin member 50, it is reinforced by the second resin member 50. For this reason, even when an external force is applied to the negative electrode terminal portion 30, it is possible to prevent the first metal member 35 and the second metal member 36 from being separated at the joint portion 37. That is, when an external force is applied to the negative electrode terminal portion 30, the second resin member 50 absorbs stress, so that it is possible to suppress separation of the first metal member 35 and the second metal member 36 at the joint portion 37. is there.

Further, the first metal member 35 and the second metal member 36 are made of different kinds of metal, and the first metal member 35 and the positive electrode terminal portion 20 are made of the same kind of metal. Therefore, when the electric element unit 300 is manufactured by connecting a plurality of electric elements 200 in series, it is not necessary to use a bus bar made of an expensive clad material.
That is, a plurality of electric elements 200 can be connected in series using an inexpensive bus bar 310 that is integrally formed of the same type of metal.

The first metal member 35 is disposed through the second through hole 14, and a part of the first metal member 35 and the joint portion 37 are located on the lower side of the lid body 10.
In the first metal member 35, the entire surface of the portion located on the lower side of the lid body 10 is covered with the second resin member 50.
Therefore, the contact of the electrolyte solution to the portion (first metal member 35) made of the same type of metal as the positive electrode terminal portion 20 in the negative electrode terminal portion 30 can be suppressed by the presence of the second resin member 50, and the electric element 200 can be operated normally.

  Further, since the first metal member 35 and the second metal member 36 are mechanically joined to each other at the joint portion 37, the lid body 100 having a structure in which the negative electrode terminal portion 30 can be easily manufactured can be obtained.

  In particular, since the first metal member 35 and the second metal member 36 are fitted and fixed to each other at the joint portion 37, the lid body 100 having a structure in which the negative electrode terminal portion 30 can be manufactured very easily can be obtained. And it can be set as the cover body 100 of the structure which can also reduce the contact resistance in the junction part 37 of the 1st metal member 35 and the 2nd metal member 36 easily.

Moreover, since the fine unevenness | corrugation is formed in the surface of the 1st metal member 35, and the surface in which the said fine unevenness | corrugation was formed is covered with the 2nd resin member 50, it is 2nd resin with respect to the 1st metal member 35. A sufficient bonding strength of the member 50 can be ensured.
More specifically, fine irregularities are also formed on the surface of the second metal member 36, and the surface on which the fine irregularities are formed is covered with the second resin member 50, so the second metal member The bonding strength of the second resin member 50 to 36 can be sufficiently ensured.

In addition, the adhesiveness of the resin member with respect to aluminum or aluminum alloy is superior to the adhesiveness of the resin member with respect to copper or copper alloy.
For this reason, a fitting recess 39 is formed in the first metal member 35 made of aluminum or an aluminum alloy, and the fitting protrusion 38 of the second metal member 36 is inserted into the fitting recess 39. Thereby, the joining area of aluminum or aluminum alloy and the 2nd resin member 50 can be enlarged more. Therefore, the sealing property (sealing property) of the gap between the negative electrode terminal portion 30 and the lid body 10 by the second resin member 50 can be improved.

<Modification 1>
Fig.7 (a) is a front view which shows a part of negative electrode terminal part 30 of the cover body 100 which concerns on the modification 1 of 1st Embodiment.

In the first embodiment, the example in which the fitting protrusion 38 is an arrow has been described. In this modification, the fitting protrusion 38 is formed in a circular shape (substantially circular).
Even when the negative electrode terminal portion 30 having the structure according to the modification 1 is used, the same effect as that of the first embodiment can be obtained.

<Modification 2>
FIG.7 (b) is a front view which shows a part of negative electrode terminal part 30 of the cover body 100 which concerns on the modification 2 of 1st Embodiment.

In the first embodiment described above, the example in which the fitting protrusion 38 has an arrow shape has been described. In the present modification, the fitting protrusion 38 is formed in an inverted triangle.
Even when the negative electrode terminal portion 30 having the structure according to the second modification is used, the same effects as those of the first embodiment can be obtained.

[Second Embodiment]
FIG. 8 is a view showing a negative electrode terminal portion 30 of a lid body (not shown) according to the second embodiment, among which (a) is before joining the first metal member 35 and the second metal member 36. FIG. 4B is a perspective view showing a structure after the first metal member 35 and the second metal member 36 are joined together, and FIG. 5C is a view in which the negative electrode terminal portion 30 is a lid through the second resin member 50. FIG. 3 is a front view of a state fixed to a main body 10.

  In the lid, the electric element 200, and the electric element unit 300 according to the present embodiment, the bonding structure of the first metal member 35 and the second metal member 36 has the lid 100 and the electric element according to the first embodiment described above. 200 and the electric element unit 300, and other configurations are the same as the lid 100, the electric element 200, and the electric element unit 300 according to the first embodiment.

  In the case of the present embodiment, as shown in FIG. 8, the first metal member 35 and the second metal member 36 are engaged and fixed to each other at the joint portion 37.

More specifically, for example, a J-shaped engagement hook 61 is formed at the lower end of the first metal member 35, and an inverted J-shaped engagement hook is formed at the upper end of the second metal member 36. 62 is formed.
Then, the engagement hook 62 and the engagement hook 61 are engaged with each other, whereby the second metal member 36 and the first metal member 35 are joined to each other (FIG. 8B).

  The upper end portion (for example, the upper end surface) of the engagement hook 62, that is, the upper end 36 a of the second metal member 36 is preferably in contact with the lower surface of the lid body 10. In this case, the engagement hook 62 is restricted from moving upward relative to the engagement hook 61. In this case, as shown in FIG. 8A, the engaging hook 62 and the engaging hook 61 are engaged with each other by relatively moving the engaging hook 62 and the engaging hook 61 horizontally. Can do.

  In addition to engaging and fixing, the second metal member 36 and the first metal member 35 may be fixed by partial pressure bonding, adhesion, or ultrasonic welding. The partial adhesion is preferably performed using a conductive adhesive.

As shown in FIG. 8C, also in this embodiment, the second resin member 50 is located from a position above the upper end 36a of the second metal member 36 (the upper end of the engagement hook 62 in this embodiment). The periphery of the negative electrode terminal portion 30 is covered to a position below the lower end 35a of the first metal member 35 (the lower end of the engagement hook 61 in this embodiment).
That is, also in this embodiment, the second resin member 50 covers the periphery of the joint portion 37.

  As in the second embodiment as described above, the same effect as that of the first embodiment can be obtained even when engagement and fixation are used as mechanical joining.

[Third Embodiment]
FIG. 9 is a view showing the negative electrode terminal portion 30 of the lid body (not shown) according to the third embodiment, among which (a) is before joining the first metal member 35 and the second metal member 36. FIG. 4B is a perspective view showing a structure after the first metal member 35 and the second metal member 36 are joined together, and FIG. 5C is a view in which the negative electrode terminal portion 30 is a lid through the second resin member 50. FIG. 3 is a front view of a state fixed to a main body 10.

  In the lid, the electric element 200, and the electric element unit 300 according to the present embodiment, the bonding structure of the first metal member 35 and the second metal member 36 has the lid 100 and the electric element according to the first embodiment described above. 200 and the electric element unit 300, and other configurations are the same as the lid 100, the electric element 200, and the electric element unit 300 according to the first embodiment.

  In the case of the present embodiment, as shown in FIG. 9, the first metal member 35 and the second metal member 36 are inserted and fixed to each other at the joint portion 37.

More specifically, for example, an insertion hole 63 opened downward is formed at the lower end of the first metal member 35, and protrudes upward at the upper end of the second metal member 36. An insertion protrusion 64 is formed.
The second metal member 36 and the first metal member 35 are joined to each other by inserting the insertion protrusion 64 into the insertion hole 63. For example, the insertion protrusion 64 is press-fitted and fixed to the insertion hole 63 (FIG. 9B).
In contrast, an insertion hole may be formed in the second metal member 36, and an insertion protrusion may be formed in the first metal member 35.

  The second metal member 36 and the first metal member 35 may be fixed by partial crimping, adhesion, or ultrasonic welding in addition to insertion fixing. The partial adhesion is preferably performed using a conductive adhesive.

  The first metal member 35 is fixed to the lid main body 10 and the second metal member 36 is fixed to the first metal member 35, and the lid main body 10 is canned as shown in FIG. The lower end portion of the second metal member 36 is in contact with or close to the bottom portion of the can member 210 in a state where it is joined to the edge portion of the opening portion 210a of the member 210. Thereby, the drop-off of the insertion protrusion 64 from the insertion hole 63 is regulated.

  In the present embodiment, the second resin member 50 covers the periphery of the negative electrode terminal portion 30 from a position below the lower end 35a of the first metal member 35 to a position above the lower end 35a. That is, also in this embodiment, the 2nd resin member 50 has covered the circumference | surroundings of the junction part 37 (FIG.9 (c)).

  As in the third embodiment as described above, the same effect as that of the first embodiment can be obtained even when the insertion fixing is used as the mechanical joining.

[Fourth Embodiment]
FIG. 10 is a view showing a negative electrode terminal portion 30 of a lid body (not shown) according to the fourth embodiment, in which (a) is before the first metal member 35 and the second metal member 36 are joined together. FIG. 4B is an exploded side sectional view before joining the first metal member 35 and the second metal member 36, and FIG. 5C is a diagram showing the joined first metal member 35 and the second metal member 36. FIG. 4D is a side sectional view showing a subsequent structure, and FIG. 4D is a side sectional view showing a state in which the negative electrode terminal portion 30 is fixed to the lid body 10 via the second resin member 50.

  In the lid, the electric element 200, and the electric element unit 300 according to the present embodiment, the bonding structure of the first metal member 35 and the second metal member 36 has the lid 100 and the electric element according to the first embodiment described above. 200 and the electric element unit 300, and other configurations are the same as the lid 100, the electric element 200, and the electric element unit 300 according to the first embodiment.

  In the case of this embodiment, as shown in FIG. 10, the first metal member 35 and the second metal member 36 are engaged and fixed using a leaf spring.

More specifically, for example, an insertion protrusion 65 protruding upward is formed on the upper end portion of the second metal member 36. A locking projection 65 a is formed at the tip of the insertion projection 65.
An insertion hole 69 that opens downward is formed at the lower end of the first metal member 35. A leaf spring portion 69 a is provided in the insertion hole 69. The leaf spring portion 69 a may be formed integrally with the first metal member 35, or may be formed separately from the first metal member 35 and then fixed to the first metal member 35. .

  By inserting the insertion protrusion 65 into the insertion hole 69, the second metal member 36 and the first metal member 35 are joined to each other. In other words, the leaf spring portion 69a is elastically pressed against the insertion protrusion 65, and the engagement protrusion 65a is engaged with the distal end portion of the leaf spring portion 69a (FIG. 10C).

  In contrast, an insertion hole may be formed in the second metal member 36, and an insertion protrusion may be formed in the first metal member 35.

  The second metal member 36 and the first metal member 35 may be fixed by partial pressure bonding, adhesion, or ultrasonic welding in addition to the engagement and fixation using a leaf spring. The partial adhesion is preferably performed using a conductive adhesive.

  In the present embodiment, the second resin member 50 covers the periphery of the negative electrode terminal portion 30 from a position below the lower end 35a of the first metal member 35 to a position above the lower end 35a. That is, also in this embodiment, the 2nd resin member 50 has covered the circumference | surroundings of the junction part 37 (FIG.10 (d)).

As in the fourth embodiment as described above, the same effect as that of the first embodiment can be obtained also when the engagement and fixing using a leaf spring is used as the mechanical joint.
[Fifth Embodiment]
FIG. 11 is a view showing a negative electrode terminal portion 30 of a lid body (not shown) according to the fifth embodiment, in which (a) shows a state before joining the first metal member 35 and the second metal member 36. (B) is an exploded front view before joining the first metal member 35 and the second metal member 36, and (c) is after joining the first metal member 35 and the second metal member 36. FIG. 6D is a front sectional view showing a state in which the negative electrode terminal portion 30 is fixed to the lid body 10 via the second resin member 50.

  In the lid, the electric element 200, and the electric element unit 300 according to the present embodiment, the bonding structure of the first metal member 35 and the second metal member 36 has the lid 100 and the electric element according to the first embodiment described above. 200 and the electric element unit 300, and other configurations are the same as the lid 100, the electric element 200, and the electric element unit 300 according to the first embodiment.

  In the case of this embodiment, as shown in FIG. 11, the first metal member 35 and the second metal member 36 are caulked and fixed to each other.

More specifically, for example, an insertion protrusion 67 protruding upward is formed at the upper end portion of the second metal member 36, and the upper end of the insertion protrusion 67 is formed at the base end portion of the insertion protrusion 67. A constricted portion 67a thinner than the portion is formed.
An insertion hole 66 that opens downward is formed at the lower end of the first metal member 35.
And after the insertion protrusion 67 is inserted in the insertion hole 66, the lower end part of the 1st metal member 35 is crimped, and the 2nd metal member 36 and the 1st metal member 35 are mutually joined. (FIG. 11 (c)).

  The second metal member 36 and the first metal member 35 may be fixed by partial adhesion or ultrasonic welding in addition to caulking. The partial adhesion is preferably performed using a conductive adhesive.

  In the present embodiment, the second resin member 50 covers the periphery of the negative electrode terminal portion 30 from a position below the lower end 35a of the first metal member 35 to a position above the lower end 35a. That is, also in this embodiment, the 2nd resin member 50 has covered the circumference | surroundings of the junction part 37 (FIG.11 (d)).

  Even when caulking is used for mechanical joining as in the fifth embodiment as described above, the same effect as in the first embodiment can be obtained.

[Sixth Embodiment]
FIG. 12 is a view showing the negative electrode terminal portion 30 of the lid (not shown) according to the sixth embodiment, in which (a) is before joining the first metal member 35 and the second metal member 36. FIG. 4B is a perspective view showing a structure after the first metal member 35 and the second metal member 36 are joined together, and FIG. 5C is a view in which the negative electrode terminal portion 30 is a lid through the second resin member 50. FIG. 3 is a front view of a state fixed to a main body 10.

  In the lid, the electric element 200, and the electric element unit 300 according to the present embodiment, the bonding structure of the first metal member 35 and the second metal member 36 has the lid 100 and the electric element according to the first embodiment described above. 200 and the electric element unit 300, and other configurations are the same as the lid 100, the electric element 200, and the electric element unit 300 according to the first embodiment.

In the case of this embodiment, as shown in FIG. 12, the joining of the first metal member 35 and the second metal member 36 is metallurgical joining. More specifically, for example, the first metal member 35 and the second metal member 36 are joined to each other by welding.
For example, as shown in FIG. 12B, the lower end 35a of the first metal member 35 is welded in a state where the lower end portion of the first metal member 35 and the upper end portion of the second metal member 36 are overlapped with each other. In addition to being welded to the second metal member 36 at 68, the upper end 36 a of the second metal member 36 is welded to the first metal member 35 in the welded portion 68.
That is, the joint portion 37 has a pair of upper and lower welds 68.

  In the case of this embodiment, the second resin member 50 covers the periphery of the negative electrode terminal portion 30 from a position below the lower welded portion 68 to a position above the upper welded portion 68. That is, also in this embodiment, the 2nd resin member 50 has covered the circumference | surroundings of the junction part 37 (FIG.12 (c)).

  Even when the first metal member 35 and the second metal member 36 are joined to each other by metallurgical joining (specifically, for example, welding) as in the third embodiment as described above, The same effect as the embodiment can be obtained.

[Seventh Embodiment]
FIG. 13 is a front sectional view showing a lid 100 according to the seventh embodiment.

  The lid 100, the electric element 200, and the electric element unit 300 according to the present embodiment are different from the lid 100, the electric element 200, and the electric element unit 300 according to the first embodiment described above in the points described below. In other respects, the lid 100, the electric element 200, and the electric element unit 300 according to the first embodiment are configured in the same manner.

In the case of this embodiment, not only the negative electrode terminal portion 30 has the joint portion 37, but also the positive electrode terminal portion 20 has the joint portion 27 similar to the joint portion 37.
That is, the positive electrode terminal portion 20 includes a first metal member 25 and a second metal member 26, a fitting protrusion 28 is formed on the second metal member 26, and the first metal member 25 is fitted. A concavity 29 is formed. And the joint part 27 is comprised by the fitting projection part 28 and the fitting recessed part 29 fitting with each other.
The first metal member 25, the second metal member 26, the fitting projection 28, and the fitting recess 29 are the same as the first metal member 35, the second metal member 36, the fitting projection 38, and the fitting recess 39, respectively. It is configured.

  The first metal member 25 and the second metal member 26 are made of, for example, the same kind of metal (for example, aluminum or aluminum alloy, respectively).

Also according to the seventh embodiment, the same effect as in the first embodiment can be obtained.
In addition, the structure of the lid body 100 may be configured such that a plurality of types of second metal members 26 or first metal members 25 are joined to the common first metal member 25 or second metal member 26 to form the positive electrode terminal portion 20. It is a possible structure.
For this reason, the second metal member 26 having the first internal terminal is manufactured in a wide variety and has many variations, while the first metal member 25 common to the multiple types of second metal members 26 is provided. Can be connected and used.
Similarly, the first metal member 25 having the first external terminals is manufactured in a variety of types and has many variations, while the first metal member 25 common to the various types of first metal members 25 is provided. Can also be used.

  In the seventh embodiment, the example in which the structure of the joints 27 and 37 is the same as the structure of the joint 37 in the first embodiment has been described. The same structure as in the second to sixth embodiments may be used.

  Further, in each of the above-described embodiments, the negative electrode terminal portion 30 is configured by simply joining a plurality of types of the second metal member 36 or the first metal member 35 to the common first metal member 35 or the second metal member 36. Therefore, the first metal member 35 and the second metal member 36 may be made of the same type of metal (for example, copper or copper alloy, respectively).

  In each of the above embodiments, a secondary battery (for example, a lithium ion secondary battery) in which the power generator 220 is accommodated in a container (can member 210) has been described as the electric element 200. A capacitor (for example, a lithium ion capacitor) in which a power storage unit is housed may be used. This power storage unit is different from the power generation unit 220 described above in that the negative electrode layer and the positive electrode layer each do not contain an active material (they do not contain either a positive electrode active material or a negative electrode active material). When the electric element 200 is a capacitor, the power storage unit stores power.

  In the above description, the electric element 200 having a structure in which the positive terminal portion 20 and the lid body 10 are insulated from each other by the first resin member 40 has been described. However, the structure of the electric element 200 is such that the positive electrode terminal portion 20 is in contact with the lid main body 10 and is electrically connected to the lid main body 10, and the positive electrode terminal portion 20 is interposed through the lid main body 10. The positive electrode terminal portion 20, the lid body 10, and the can member 210 may have a positive electrode terminal.

10 Lid main body 11 Injection hole 12 Pressure release valve 13 First through hole 14 Second through hole (through hole)
15 Plug 20 Positive terminal portion (first terminal portion)
21 Lead portion 21a Inner arrangement portion (having first internal terminal)
21b Outer arrangement portion 22 Top surface portion (having first external terminal)
25 1st metal member 26 2nd metal member 27 Joining part 28 Fitting protrusion part 29 Fitting recessed part 30 Negative electrode terminal part (2nd terminal part)
31 Lead portion 31a Inner arrangement portion (having second internal terminal)
31b Outer arrangement portion 32 Top surface portion (having second external terminal)
35 first metal member 35a lower end 36 second metal member 36a upper end 37 joint 38 fitting projection 38a small dimension 38b large dimension 39 fitting recess 39a small dimension 39b large dimension 40 first resin member 50 second Resin member (resin member)
61 Engagement hook 62 Engagement hook 63 Insertion hole 64 Insertion projection 65 Insertion projection 65a Locking projection 66 Insertion hole 67 Insertion projection 67a Constriction part 68 Welding part 69 Insertion hole 69a Leaf spring part 100 Lid 200 Electric element 210 Can member (container)
210a Opening 220 Power generator 300 Electric element unit 310 Bus bar (connection terminal part)

Claims (12)

A lid attached to an opening of a container for storing a power generator or a power storage body,
A lid body covering the opening;
A first terminal portion and a second terminal portion, each of which is disposed through a through-hole formed in the lid body,
A resin member that seals a gap between the second terminal portion and the lid body, and fixes the second terminal portion to the lid body;
With
The first terminal portion is
A first external terminal located on one side with respect to the lid body;
A first internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
Including
The second terminal portion is
A second external terminal located on one side with respect to the lid body;
A second internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
As well as
The second terminal portion is
A first metal member having the second external terminal;
A second metal member having the second internal terminal;
Have
The first metal member and the second metal member are joined to each other at a joint portion,
The joint is covered with the resin member ;
The first metal member and the second metal member are fitted and fixed to each other at the joint, and are configured to be fitted and fixed to each other before being fitted and fixed . body. The first metal member and the second metal member are made of different metals,
The lid according to claim 1, wherein the first metal member and the first terminal portion are made of the same kind of metal. The first metal member and the first terminal portion are each made of aluminum or an aluminum alloy,
The lid according to claim 2, wherein the second metal member is made of copper or a copper alloy. The first metal member is disposed through the through hole, and a part of the first metal member and the joint portion are located on the other side with respect to the lid body,
The lid according to claim 3, wherein in the first metal member, the entire surface of the portion located on the other side with respect to the lid body is covered with the resin member.   The lid according to any one of claims 1 to 4, wherein the resin member insulates the lid body and the second terminal portion from each other. The lid according to any one of claims 1 to 5 , wherein fine irregularities are formed on a surface of the first metal member, and a surface on which the fine irregularities are formed is covered with the resin member. . The resin member is at least selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, fluorine resin, acrylic resin, polyamide, polyimide, acetal resin, polycarbonate, polyphenylene oxide, polyphenylene sulfide, polyester, and polysulfone. The lid according to any one of claims 1 to 6 , comprising any one thermoplastic resin. A container having an opening;
A lid attached to the opening of the container;
A power generator or a power storage unit housed in the container;
An electrical element comprising:
The lid is
A lid body covering the opening;
A first terminal portion and a second terminal portion, each of which is disposed through a through-hole formed in the lid body,
A resin member that seals a gap between the second terminal portion and the lid body, and fixes the second terminal portion to the lid body;
With
The first terminal portion is
A first external terminal located on one side with respect to the lid body;
A first internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
Including
The second terminal portion is
A second external terminal located on one side with respect to the lid body;
A second internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
As well as
The second terminal portion is
A first metal member having the second external terminal;
A second metal member having the second internal terminal;
Have
The first metal member and the second metal member are made of different metals,
The first metal member and the second metal member are joined to each other at a joint portion,
The joint is covered with the resin member ;
The first metal member and the second metal member are fitted and fixed to each other at the joint, and are configured to be fitted and fixed to each other before being fitted and fixed . element. A plurality of electrical elements;
A connection terminal portion electrically connecting the plurality of electrical elements to each other;
An electrical element unit comprising:
Each of the plurality of electrical elements is
A container having an opening;
A lid attached to the opening of the container;
A power generator or a power storage unit housed in the container;
With
The lid is
A lid body covering the opening;
A first terminal portion and a second terminal portion, each of which is disposed through a through-hole formed in the lid body,
A resin member that seals a gap between the second terminal portion and the lid body, and fixes the second terminal portion to the lid body;
With
The first terminal portion is
A first external terminal located on one side with respect to the lid body;
A first internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
Including
The second terminal portion is
A second external terminal located on one side with respect to the lid body;
A second internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
As well as
The second terminal portion is
A first metal member having the second external terminal;
A second metal member having the second internal terminal;
Have
The first metal member and the second metal member are joined to each other at a joint portion,
The joint is covered with the resin member;
The first metal member and the second metal member are made of different metals,
The first metal member, the first terminal portion and the connection terminal portion are made of the same kind of metal ,
The first metal member and the second metal member are fitted and fixed to each other at the joint, and are configured to be fitted and fixed to each other before being fitted and fixed . Element unit. A method of manufacturing a lid attached to an opening of a container that houses a power generator or a power storage unit,
The lid is
A lid body covering the opening;
A first terminal portion and a second terminal portion, each of which is disposed through a through-hole formed in the lid body,
A resin member that seals a gap between the second terminal portion and the lid body, and fixes the second terminal portion to the lid body;
With
The first terminal portion is
A first external terminal located on one side with respect to the lid body;
A first internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
Including
The second terminal portion is
A second external terminal located on one side with respect to the lid body;
A second internal terminal that is located on the other side with respect to the lid body and to which the power generator or the power storage unit is electrically connected;
As well as
The second terminal portion is
A first metal member having the second external terminal;
A second metal member having the second internal terminal;
Have
The manufacturing method is
Fitting and fixing the first metal member and the second metal member to each other;
Molding the resin member in a state where the second terminal portion is disposed so that the second terminal portion is in a state of passing through the through hole;
With
In the step of molding the resin member, a gap between the second terminal portion and the lid body is sealed by the resin member, and the second terminal portion is fixed to the lid body by the resin member. And the resin member is molded so that the joint portion between the first metal member and the second metal member is covered with the resin member ,
The first metal member and the second metal member, before being fitted and fixed, the lid manufacturing method that have been shaped to be fitted and fixed to each other. In the step of joining the first metal member and the second metal member to each other,
By press-fitting a protrusion formed on one of the first metal member and the second metal member into a recess formed on the other of the first metal member and the second metal member The method of manufacturing a lid according to claim 10 , wherein the first metal member and the second metal member are fitted and fixed to each other. In the step of molding the resin member, the resin member is molded by injection molding a thermoplastic resin composition,
The method for manufacturing a lid according to claim 10 or 11 , wherein the injection molding is insert molding or outsert molding.

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