CN108701805A - The manufacturing method of charge storage element and charge storage element - Google Patents

Abstract

The present invention provides an energy storage element and a method for manufacturing the energy storage element. The energy storage element (10) includes a container (100) having a cover (110), a positive terminal (210) penetrating the cover (110), and a positive current collector (220) connected to the positive terminal (210). The cover (110) and the positive terminal (210) are integrated together with an intermediate component (500) disposed between the cover (110) and the positive terminal (210). The positive terminal (210) has: a first plane (211a) disposed outside the container (100) along the outer surface of the cover (110); and a second plane (212a) disposed inside the container (100) along the inner surface of the cover (110), which is a surface that protrudes from the positive current collector (220) and extends all over the outer periphery of the positive current collector (220).

Description

Electric storage device and method for manufacturing electric storage device

technical field

The present invention relates to an electrical storage element including a container, an electrode terminal penetrating through a wall of the container, and a current collector connected to the electrode terminal, and a method for manufacturing the same.

Background technique

An electricity storage device including a container, an electrode terminal penetrating the wall of the container, and a current collector connected to the electrode terminal is widely known. Furthermore, an electricity storage element in which an electrode terminal and a wall portion (lid) of a container are bonded and integrated with a resin insulating member has been proposed (see, for example, Patent Document 1).

prior art literature

patent documents

Patent Document 1: Japanese Unexamined Patent Publication No. 2011-76731

Contents of the invention

The problem to be solved by the invention

Here, if the electrode terminal cannot be fixed at the correct position with respect to the wall portion of the container, for example, there will be a problem that the electrode terminal cannot be arranged at the correct position with respect to the bus bar. However, in the structure in which the electrode terminal is integrated with the wall of the container as in the above-mentioned conventional energy storage element, it is difficult to correct the position of the electrode terminal with respect to the wall after the integration.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric storage element capable of fixing an electrode terminal at a correct position with respect to a wall of a container, and a method for manufacturing the same.

means to solve the problem

In order to achieve the above object, an electrical storage device according to an aspect of the present invention is an electrical storage device including a container having a wall, an electrode terminal penetrating through the wall, and a current collector connected to the electrode terminal. The wall portion and the electrode terminal are integrated together with an intermediate member disposed between the wall portion and the electrode terminal, the electrode terminal having a first plane along the wall outside the container and a second plane arranged along the inner surface of the wall portion in the interior of the container and is a surface protruding from the current collector throughout the outer circumference of the current collector.

Invention effect

According to the electricity storage element of the present invention, the electrode terminal can be fixed at a correct position with respect to the wall of the container.

Description of drawings

FIG. 1 is a perspective view schematically showing the appearance of an electricity storage element according to an embodiment of the present invention.

FIG. 2 is a perspective view showing components arranged inside a container of the electricity storage device according to the embodiment of the present invention.

3 is a cross-sectional perspective view showing the configuration of a positive terminal member and an intermediate member according to the embodiment of the present invention.

4 is a perspective view showing the structure of the positive terminal member according to the embodiment of the present invention.

5 is a perspective view showing a step of arranging the positive terminal member and the negative terminal member in the lid according to the embodiment of the present invention.

6 is a cross-sectional view showing a step of integrating the positive terminal member and the cover according to the embodiment of the present invention together with the intermediate member.

7 is a perspective view showing a step of deforming a positive electrode current collector and a negative electrode current collector of the positive electrode terminal member and the negative electrode terminal member according to the embodiment of the present invention.

8 is a perspective view showing a step of connecting a positive terminal member and a negative terminal member to an electrode body according to the embodiment of the present invention.

Detailed ways

If the electrode terminal cannot be fixed at the correct position with respect to the wall of the container, for example, problems such as inability to arrange the electrode terminal at the correct position with respect to the bus bar may occur. Failure to arrange the electrode terminals at the correct position with respect to the bus bar may cause poor soldering when the bus bar is welded to the electrode terminal, or in other cases, may cause a problem between the bus bar and the bus bar. An important factor of poor connection of electrode terminals.

However, in a structure in which the electrode terminals are integrated with the wall of the container as in the above conventional energy storage device, it is difficult to correct the position of the electrode terminals with respect to the wall after the integration. Therefore, when integrating the electrode terminal with the wall, it is desirable to fix the electrode terminal at a correct position with respect to the wall.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrical storage element capable of fixing an electrode terminal at a correct position with respect to a wall of a container, and a method for manufacturing the same.

In order to achieve the above object, an electrical storage device according to an aspect of the present invention is an electrical storage device including a container having a wall, an electrode terminal penetrating through the wall, and a current collector connected to the electrode terminal. A wall and the electrode terminal are integrated together with an intermediate member arranged between the wall and the electrode terminal, the electrode terminal having a first plane along the wall outside the container and the second plane, arranged along the inner surface of the wall portion inside the container, is a surface protruding from the current collector throughout the outer circumference of the current collector.

According to this, in the electricity storage element, the wall portion of the container and the electrode terminal are integrated together with the intermediate member between the wall portion and the electrode terminal, and the electrode terminal has the first plane arranged along the outer surface of the wall portion and the first plane along the wall portion. The inner surface of is configured with a second plane extending over the outer periphery of the current collector and protruding. Accordingly, when the electrode terminal and the wall of the container are integrated, the electrode terminal can be easily fixed at a correct position with respect to the wall by sandwiching the first plane and the second plane of the electrode terminal with the mold. In particular, the second plane is a protruding surface extending over the outer periphery of the current collector. Therefore, the electrode terminal can be stably fixed at a correct position with respect to the wall portion by pressing with the die over the outer periphery of the current collector.

In addition, the electrode terminal and the current collector may be integrated.

According to this, since the electrode terminal and the current collector are integrated, the electrode terminal can be fixed at a correct position with respect to the wall portion, and the current collector can also be fixed at a correct position.

In addition, in order to achieve the above object, a method for manufacturing an electrical storage device according to an aspect of the present invention is an electrical storage device including a container having a wall, an electrode terminal penetrating the wall, and a current collector connected to the electrode terminal. A method of manufacturing an electrical component, comprising a terminal mounting step of mounting the electrode terminal on the wall in a state in which the electrode terminal penetrates the wall, the terminal mounting process includes a clamping process of clamping the The first plane and the second plane of the electrode terminal, wherein the first plane is arranged along the outer surface of the wall outside the container, and the second plane is arranged along the inner surface of the wall inside the container disposition, a surface protruding from the current collector over the outer circumference of the current collector; and a forming step, forming an intermediate member between the wall portion and the electrode terminal, the wall portion and the electrode terminal integrally formed with the intermediate part.

According to this, in the method of manufacturing an electric storage element, including: a holding step of holding the first plane and a second plane of the electrode terminal; and a forming step of forming an intermediate member between the wall portion of the container and the electrode terminal so that The wall portion and the electrode terminal are integrally formed with the intermediate member. The first flat surface is arranged along the outer surface of the wall of the container, and the second flat is arranged along the inner surface of the wall and protrudes over the outer periphery of the current collector. Thus, when the electrode terminal and the wall of the container are integrally formed, the electrode terminal can be easily fixed at a correct position with respect to the wall by sandwiching the first plane and the second plane of the electrode terminal with the mold. In particular, the second flat surface is a protruding surface extending over the outer periphery of the current collector. Therefore, the electrode terminal can be stably fixed at a correct position with respect to the wall by pressing with the die over the outer periphery of the current collector.

In addition, a current collector deforming step of deforming the current collector connected to the electrode terminal may be included after the terminal mounting step.

Accordingly, after the electrode terminal is attached to the wall of the container, the current collector connected to the electrode terminal is deformed, so that the current collector can be deformed while the electrode terminal is fixed to the wall. Thereby, the current collector can be deformed easily and precisely, and the current collector can be fixed at a correct position with respect to the wall.

In addition, a method of manufacturing an electricity storage device including a container having a wall, an electrode terminal, and a current collector connected to the electrode terminal, including a terminal mounting step in which the electrode terminal penetrates the wall mounting the electrode terminal on the wall; and a current collector deforming step of deforming the current collector connected to the electrode terminal after the terminal mounting process.

Accordingly, after the electrode terminal is attached to the wall of the container, the current collector connected to the electrode terminal is deformed, so that the current collector can be deformed while the electrode terminal is fixed to the wall. Thereby, the current collector can be easily deformed precisely, and the current collector can be fixed at a correct position with respect to the wall.

Hereinafter, the power storage device according to the embodiment of the present invention will be described with reference to the drawings. It should be noted that all the embodiments described below represent a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connections of constituent elements, manufacturing steps, and order of manufacturing steps shown in the following embodiments are examples and do not limit the present invention. In addition, among the structural elements in the following embodiments, the structural elements not described in the independent claims representing the highest concept will be described as arbitrary structural elements. In addition, each drawing is a schematic diagram, and a dimension etc. are not strictly illustrated.

It should be noted that in the following description and drawings, the winding axis direction of the electrode body of the storage device, the arrangement direction of the current collector or the electrode terminal, the opposing direction of the short side of the container, or the long side of the container The length direction of is defined as the X-axis direction. In addition, the facing direction of the long sides of the container, the short direction of the short sides of the container, or the thickness direction of the container are defined as the Y-axis direction. In addition, the vertical direction of the storage element (the direction in which gravity acts in the installed state), the extending direction of the leg of the current collector, the longitudinal direction of the short side surface of the container, or the short side direction of the long side surface of the container are defined as the Z axis. direction. These X-axis directions, Y-axis directions, and Z-axis directions are directions intersecting each other (orthogonal in this embodiment). It should be noted that the Z-axis direction may not be the up-down direction depending on the usage form, and the Z-axis direction is not limited to the up-down direction. However, for convenience of description, the Z-axis direction will be described as the up-down direction. In addition, in the following description, for example, the positive side in the X-axis direction means the side in the arrow direction of the X-axis, and the negative side in the X-axis direction means the side opposite to the positive side in the X-axis direction. The Y-axis direction and the Z-axis direction are electrically the same.

(implementation mode)

First, the structure of the electricity storage element 10 will be described.

FIG. 1 is a perspective view schematically showing the appearance of an electricity storage element 10 according to an embodiment of the present invention. In addition, FIG. 2 is a perspective view showing components arranged inside the container 100 of the electricity storage device 10 according to the embodiment of the present invention. Specifically, FIG. 2 is a perspective view showing a configuration in a state where the container main body 111 is separated from the electricity storage element 10 .

The power storage element 10 is a secondary battery capable of charging and discharging electric power, specifically, a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. The power storage device 10 is used, for example, as a power source for automobiles such as electric vehicles (EV), hybrid electric vehicles (HEV), or plug-in hybrid electric vehicles (PHEV), power sources for electronic devices, power sources for power storage, and the like. It should be noted that the power storage element 10 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, or may be an accumulator, and further may be a battery that can be charged even if the user does not charge it. Primary battery using stored electric power. In addition, in the present embodiment, although a rectangular box-shaped (square) electric storage element 10 is shown in the figure, the shape of the electric storage element 10 is not limited to a rectangular shape, and may be a cylindrical shape, an elliptical cylindrical shape, or the like. It is a laminated storage device.

As shown in FIG. 1 , the storage device 10 includes a container 100 , a positive terminal member 200 , and a negative terminal member 300 . In addition, as shown in FIG. 2 , the positive terminal part 200 has a positive terminal 210 and a positive current collector 220, the negative terminal part 300 has a negative terminal 310 and a negative current collector 320, and the positive current collector 220 and the negative current collector 320 are It is accommodated inside the container 100 . Furthermore, the electricity storage device 10 includes the electrode body 400 inside the container 100 and further includes the intermediate members 500 and 600 .

It should be noted that, in addition to the above-mentioned structural elements, separators arranged on the side surfaces of the positive electrode current collector 220 and the negative electrode current collector 320 may be arranged, and an exhaust valve for releasing the pressure when the pressure in the container 100 rises. , or an insulating sheet or the like enclosing the electrode body 400 or the like. In addition, liquid such as electrolytic solution (non-aqueous electrolyte) is enclosed in the inside of the container 100, but illustration is omitted. In addition, as this electrolytic solution, as long as it does not impair the performance of the electric storage element 10, there are no particular restrictions on its type, and various electrolytic solutions can be selected.

The container 100 is composed of a rectangular cylindrical container body 111 with a bottom, and a lid 110 as a plate-like member that closes the opening of the body 111 . In addition, after housing the electrode body 400 and the like in the container 100 , the lid body 110 and the main body 111 are welded or the like, whereby the inside can be sealed. It should be noted that the material of the cover body 110 and the main body 111 is not particularly limited, for example, weldable metals such as stainless steel, aluminum or aluminum alloy can be used, and resin can also be used. Here, the lid body 110 is an example of a wall part of the container 100 .

The electrode body 400 includes a positive electrode plate, a negative electrode plate, and a separator, and is an electricity storage element (power generation element) capable of storing electric power. Here, the positive electrode plate included in the electrode body 400 is an electrode plate in which a positive electrode active material layer is formed on a positive electrode base material layer which is a strip-shaped current collector foil made of metal such as aluminum or aluminum alloy. In addition, the negative electrode plate is an electrode plate in which a negative electrode active material layer is formed on a negative electrode base foil which is a strip-shaped current collector foil made of metal such as copper or copper alloy. It should be noted that, as the positive electrode active material and the negative electrode active material used in the positive electrode active material layer and the negative electrode active material, as long as it is a positive electrode active material or a negative electrode active material that can store and release lithium ions, suitable known materials can be used. . In addition, for the separator, for example, a microporous sheet or nonwoven fabric made of resin can be used.

Furthermore, the electrode body 400 is formed by winding a structure body arranged in a layered form with a separator interposed between the positive electrode plate and the negative electrode plate. Specifically, in the electrode body 400 , the positive electrode plate and the negative electrode plate are wound in a direction offset from each other in the direction of the winding axis (a virtual axis parallel to the X-axis direction in this embodiment) via a separator. In addition, the positive electrode plate and the negative electrode plate have portions (active material non-coated portions) where the base material layer is exposed without applying the active material (active material layer is not formed) at the edge portions in the directions shifted from each other. In other words, the electrode assembly 400 has, at one end in the winding axis direction (the end on the positive side in the X-axis direction), a positive electrode cluster 410 in which active material uncoated portions of the positive electrode plates are stacked and bundled. The other end portion in the winding axis direction (the end portion on the negative side in the X-axis direction) has a negative electrode bundled portion 420 in which active material uncoated portions of the negative electrode plates are stacked and bundled.

It should be noted that, in the present embodiment, the cross-sectional shape of the electrode body 400 is shown as an oval shape, but may be an elliptical shape, a circular shape, a polygonal shape, or the like. In addition, the electrode body 400 is not limited to the wound type, and may be a stacked type in which a plurality of flat plates are stacked, or may have a shape in which the plates are folded into a corrugated shape, or the like.

The positive terminal member 200 is a conductive and rigid member electrically connected to the positive plate of the electrode body 400 . In addition, the negative terminal member 300 is a conductive and rigid member electrically connected to the negative plate of the electrode body 400 . In other words, the positive terminal member 200 and the negative terminal member 300 are metal terminal members that are fixedly connected (bonded) to the positive electrode cluster portion 410 and the negative electrode cluster portion 420 of the electrode body 400 , respectively. Thus, the positive terminal member 200 and the negative terminal member 300 lead out the electric power stored in the electrode body 400 to the external space of the storage device 10 , and also transfer the electric power to the inside of the storage device 10 in order to store the power in the electrode body 400 . space import.

Specifically, in the positive electrode terminal member 200 , the positive electrode current collector 220 is bonded to the positive electrode cluster portion 410 , so that the positive electrode terminal 210 is electrically connected to the positive plate of the electrode body 400 via the positive electrode current collector 220 . In addition, in the negative electrode terminal member 300 , the negative electrode current collector 320 is bonded to the negative electrode cluster portion 420 , so that the negative electrode terminal 310 is electrically connected to the negative electrode plate of the electrode assembly 400 via the negative electrode current collector 320 . In this way, the positive terminal 210 is an electrode terminal on the positive side, and the negative terminal 310 is an electrode terminal on the negative side.

In addition, the positive terminal member 200 and the negative terminal member 300 are attached to the cover body 110 disposed above the electrode body 400 . Specifically, the positive terminal member 200 and the negative terminal member 300 are fixed to the cover 110 by being integrated (integrated) with the cover 110 together with the intermediate members 500 and 600 . In other words, in the positive terminal member 200 , the cover 110 and the positive terminal 210 are integrated (integrated) together with the intermediate member 500 arranged between the cover 110 and the positive terminal 210 . In addition, in the negative terminal member 300 , the lid 110 and the negative terminal 310 are integrated (integrated) together with the intermediate member 600 arranged between the lid 110 and the negative terminal 310 .

According to such a configuration, the electrode body 400 is held (supported) in a state suspended from the lid body 110 by the positive terminal member 200 and the negative terminal member 300 , and vibrations, shocks, and the like can be suppressed from shaking. It should be noted that the detailed structure of the positive terminal member 200 and the negative terminal member 300 will be described later.

At least a part of intermediate members 500 and 600 is disposed between cover 110 and positive terminal member 200 and negative terminal member 300 , and is an insulating member such as resin that insulates cover 110 from positive terminal member 200 and negative terminal member 300 . In addition, the intermediate members 500 and 600 are integrated with the lid body 110 and the positive terminal member 200 and the negative terminal member 300 , and also have a function of maintaining the airtightness of the container 100 .

Specifically, the intermediate member 500 holds the positive terminal 210 in a state where a part of the positive terminal 210 of the positive terminal member 200 (first flat surface 211 a and second flat surface 212 a described later) is exposed. Likewise, the intermediate member 600 holds the negative terminal 310 in a state where a part of the negative terminal 310 of the negative terminal member 300 is exposed. Furthermore, the intermediate member 500 is integrally formed with the lid body 110 and the positive terminal 210 by, for example, insert molding. Likewise, the intermediate member 600 is integrally formed with the lid body 110 and the negative electrode terminal 310 by, for example, insert molding. Therefore, the intermediate member 500 and the intermediate member 600 are resin members formed of resin capable of insert molding.

It should be noted that the resin used as the intermediate members 500 and 600 includes, for example, polyphenylene sulfide (PPS), polypropylene (PP), polyethylene (PE), polybutylene terephthalate (PBT) , phenolic resin, etc. In addition, the resin part may be not only a part composed of one resin material, but also a part combining a plurality of resin materials, a part combining a resin material and an elastomer material, and adding particulate or fibrous particles to the resin material. Part formation of inorganic materials. In addition, the intermediate members 500 and 600 are preferably formed of a member whose rigidity is lower than that of the lid body 110 . It should be noted that, when the intermediate member 500 or 600 does not need to insulate the lid body 110 and the positive terminal member 200 or the negative terminal member 300 or insulate through other members, it does not need to have insulating properties. For example, when the container 100 and the positive terminal member 200 or the negative terminal member 300 are electrically connected, the intermediate member 500 or 600 may not have insulation.

Hereinafter, specific structures of the positive terminal member 200 and the intermediate member 500 , and the negative terminal member 300 and the intermediate member 600 will be described in detail. It should be noted that the positive terminal member 200 and the intermediate member 500 have the same structure as the negative terminal member 300 and the intermediate member 600. Therefore, the structure of the positive terminal member 200 and the intermediate member 500 will be described below, and the negative terminal member will be omitted or simplified. Description of the structure of the component 300 and the intermediate component 600 .

FIG. 3 is a cross-sectional perspective view showing the structures of the positive terminal member 200 and the intermediate member 500 according to the embodiment of the present invention. Specifically, FIG. 3 is a perspective view showing a cross section of positive terminal member 200 and intermediate member 500 shown in FIG. 2 cut along a plane parallel to the XZ plane including line III-III. It should be noted that, in FIG. 3 , the illustration of the electrode body 400 is omitted. In addition, FIG. 4 is a perspective view showing the structure of the positive electrode terminal member 200 according to the embodiment of the present invention. Specifically, FIG. 4( a ) shows the structure when the positive terminal member 200 is viewed from obliquely above, and FIG. 4( b ) shows the structure when the positive terminal member 200 is viewed from obliquely below. It should be noted that, in the present embodiment, the positive electrode current collector 220 is deformed after being attached to the lid body 110 . FIG. 4 shows a positive electrode terminal member 200 including a deformed positive electrode current collector 220 .

First, the structure of the positive terminal member 200 will be described in detail. As shown in these figures, the positive electrode terminal member 200 includes a positive electrode terminal 210 penetrating through the lid body 110 , and a positive electrode current collector 220 connected to the positive electrode terminal 210 . Here, the positive electrode terminal 210 and the positive electrode current collector 220 are one continuous member. In other words, the positive electrode terminal member 200 is formed by processing a single member, and the positive electrode terminal 210 and the positive electrode current collector 220 are integrated. It should be noted that, when integrated, the positive electrode terminal 210 and the positive electrode current collector 220 are preferably not joined by riveting, welding, or the like. In other words, the positive electrode terminal member 200 is preferably formed by processing the positive electrode terminal member 200 from a single member, as compared to processing the positive electrode terminal 210 and the positive electrode current collector 220 as separate members, which can reduce the number of parts and facilitate easy manufacture. Furthermore, the positive electrode terminal 210 has a first terminal portion 211 and a second terminal portion 212 , and the positive electrode current collector 220 has a first current collecting portion 221 , a second current collecting portion 222 , and a third current collecting portion 223 .

The first terminal portion 211 is a plate-shaped portion constituting the main body of the positive terminal 210 disposed on the upper portion of the positive terminal 210 and is connected to an external conductive member such as a bus bar. Specifically, the first terminal portion 211 is disposed above the cover 110 and inside the intermediate member 500 , and is joined to the bus bar by welding. Furthermore, specifically, the first terminal portion 211 has a first flat surface 211a, and the bus bar is soldered to the first flat surface 211a. Here, the first plane 211 a is the upper surface (the plane on the positive side in the Z-axis direction) of the positive terminal 210 , and is arranged outside the container 100 along the outer surface of the lid body 110 . In other words, the first flat surface 211 a is a surface exposed to the outside among the surfaces of the positive terminal member 200 , specifically, a surface exposed from the upper side of the intermediate member 500 . In addition, the first plane 211 a is formed flush with the upper surface of the intermediate member 500 .

It should be noted that, in this embodiment, although the first flat surface 211a is formed on the entire upper surface of the positive electrode terminal 210, it is not limited to this, and may be formed on a part of the upper surface of the positive electrode terminal 210 as The planar structure of the first plane 211a. In addition, the first plane 211 a may not be flush with the upper surface of the middle part 500 . In addition, the shape of the first terminal portion 211 is not particularly limited as long as it has the first flat surface 211 a. In addition, there is no particular limitation on how the first terminal portion 211 is connected to the conductive member. For example, the first terminal portion 211 has a bolt portion, and the bolt portion is fastened to a nut so that the first terminal portion 211 can be connected to the bus bar.

The second terminal portion 212 is a columnar portion disposed below the positive terminal 210 and penetrates the lid 110 , and is disposed above the first current collecting portion 221 of the positive electrode current collector 220 . Specifically, the second terminal portion 212 is arranged between the first terminal portion 211 and the first current collecting portion 221 to connect the first terminal portion 211 and the first current collecting portion 221 . In addition, the second terminal portion 212 is inserted into the opening portion 110 a of the circular through-hole formed in the cover body 110 , and is arranged so as to be surrounded by the intermediate member 500 .

Here, the second terminal portion 212 is arranged inside the container 100 along the inner surface of the lid body 110 , and has a surface protruding from the first current collecting portion 221 over the outer periphery of the first current collecting portion 221 of the positive electrode current collector 220 . That is, the second plane 212a. In other words, the second plane 212 a is the lower surface (the plane on the negative side in the Z-axis direction) of the positive terminal 210 , and is formed to protrude over the entire periphery of the first current collecting portion 221 (surround the entire periphery). Specifically, the second flat surface 212 a is a surface exposed from the lower side of the intermediate member 500 toward the inside of the container 100 among the surfaces of the positive electrode terminal 210 , and has an annular shape (annular shape). In addition, the second plane 212 a is formed flush with the lower surface of the intermediate member 500 .

It should be noted that the second plane 212a may not be formed in a ring shape but may be formed in a polygonal shape such as a rectangular ring shape. In addition, the second plane 212a may not be flush with the lower surface of the middle part 500 . In addition, as long as the second terminal portion 212 has the second flat surface 212a, its shape is not particularly limited. For example, the second terminal portion 212 may also be in the shape of an elliptical column, a long column, a polygonal column, or the like. In this case, the opening portion 110 a of the cover body 110 preferably has a shape corresponding to the outer shape of the second terminal portion 212 . In addition, the opening 110 a is not limited to a through hole, and may be a semicircular or rectangular cutout (cutout including the side of the lid body 110 ), or the like.

The first current collecting portion 221 is a substantially columnar portion disposed on the upper end portion of the positive electrode current collector 220 , and is connected to the second terminal portion 212 of the positive electrode terminal 210 . In addition, the first current collecting portion 221 is a portion with the smallest diameter in the positive terminal member 200 . In other words, the diameter of the first current collecting portion 221 is smaller than that of the second terminal portion 212 and is arranged coaxially with the second terminal portion 212 such that the outer circumference of the first current collecting portion 221 is smaller than that of the first current collecting portion 212 . The protruding position of 221 forms a second plane 212a. It should be noted that the first collector portion 221 may not be coaxial with the second terminal portion 212 , and the shape is not particularly limited, and may be approximately elliptical columnar, approximately elongated columnar, polygonal columnar, etc.

The second current collecting portion 222 is a portion disposed above the positive electrode current collector 220 and below the first current collecting portion 221 , and has a flat shape. Specifically, the upper edge of the second current collector 222 has the same shape as the lower edge of the first current collector 221 , and has a shape that expands downward in the X-axis direction and shrinks in the Y-axis direction.

The third current collecting portion 223 is a plate-shaped portion disposed below the second current collecting portion 222 , extends downward, and is connected to the electrode body 400 . In other words, the third current collector 223 is an elongated portion disposed on the electrode body 400 side (lower side) of the positive electrode current collector 220 , and is electrically and mechanically (physically) connected to the electrode body 400 . Specifically, the third collector portion 223 is configured to extend along the positive electrode cluster portion 410 of the electrode body 400, and the side surface on the negative side in the Y-axis direction is welded, riveted, etc., to the Y-axis of the positive electrode cluster portion 410 by resistance welding, ultrasonic welding, etc. The side joint on the positive side of the direction. Thus, the positive electrode current collector 220 is electrically connected to the positive electrode plate of the electrode assembly 400 .

In addition, the third current collecting portion 223 is formed such that its maximum width (the width in the X-axis direction) is larger than the outer diameter of the second terminal portion 212 (or the inner diameter of the third intermediate portion 530 of the intermediate member 500 described later), In addition, it is the same as or larger than the inner diameter of the opening 110 a of the cover body 110 . In other words, as will be described later, the third collector portion 223 is formed after being inserted into the opening 110 a of the cover 110 , so the maximum width can be formed larger than the maximum opening of the opening 110 a. Accordingly, the width of the third current collecting portion 223 can be increased to ensure a contact area with the positive electrode bundling portion 410 .

Here, although the material of positive electrode terminal member 200 (positive electrode terminal 210 and positive electrode current collector 220 ) is not limited, it is formed of metal such as aluminum or aluminum alloy, for example, similarly to the positive electrode base material layer of electrode body 400 . Also, the negative electrode terminal member 300 (the negative electrode terminal 310 and the negative electrode current collector 320 ) is not limited in material, but is formed of metal such as copper or a copper alloy, for example, similarly to the negative electrode base material layer of the electrode body 400 .

It should be noted that, the positive terminal part 200 or the negative terminal part 300 may be composed of any part of the first terminal part, the second terminal part, the first current collecting part, the second current collecting part and the third current collecting part. Material formation, etc. are composed of multiple parts. In this case, the positive terminal member 200 or the negative terminal member 300 is integrally formed of these plural members. In particular, regarding the negative terminal member 300 , the first terminal portion of the negative terminal 310 is preferably formed of aluminum or an aluminum alloy or the like from the viewpoint of ease of welding with the bus bar and cost reduction. Therefore, regarding the negative electrode terminal member 300, the first terminal portion of the negative electrode terminal 310 is formed of aluminum or an aluminum alloy, etc., and in addition (the second terminal portion of the negative electrode terminal 310 and the negative electrode current collector 320) is preferably made of copper or a copper alloy. And so formed.

Next, the structure of the intermediate member 500 will be described in detail. Intermediate member 500 functions as at least a part of a sealing member (gasket) disposed between lid 110 and positive terminal 210 , and is integrated with lid 110 and positive terminal 210 . As shown in FIG. 3 , the intermediate member 500 includes a first intermediate portion 510 , a second intermediate portion 520 , a third intermediate portion 530 , and a fourth intermediate portion 540 . Here, the intermediate member 500 is an integral member made of a resin member. In other words, the middle part 500 is a continuous part formed by integrating the first middle part 510 , the second middle part 520 , the third middle part 530 and the fourth middle part 540 .

The first intermediate portion 510 is an annular portion disposed on the outer periphery of the first terminal portion 211 so as to surround the first terminal portion 211 of the positive terminal 210 from its periphery. In other words, the first intermediate portion 510 is a wall surrounding the entire circumference of the first terminal portion 211 and is arranged in close contact with the entire circumference. The first intermediate portion 510 can ensure insulation from other members around the first terminal portion 211 and can suppress the first terminal portion 211 from rotating around the second terminal portion 212 .

The second middle part 520 is a plate-shaped part disposed below the first middle part 510 and between the cover body 110 and the first terminal part 211 . Specifically, the second intermediate portion 520 is arranged in close contact with the upper surface of the cover body 110 and the lower surface of the first terminal portion 211 . Thus, the second intermediate portion 520 can insulate the cover body 110 from the first terminal portion 211 and fill the gap between the cover body 110 and the first terminal portion 211 to prevent leakage.

In addition, a circular concave portion 110b is formed on the upper surface of the lid body 110 at a position where the second intermediate portion 520 is disposed (see FIG. 5(a) described later). Furthermore, the second intermediate portion 520 has a circular convex portion 521 fitted into the concave portion 110b. The protrusion 521 prevents the second intermediate portion 520 from rotating around the second terminal portion 212 , thereby preventing the first intermediate portion 510 and the first terminal portion 211 from rotating around the second terminal portion 212 . It should be noted that the shape of the concave portion 110 b and the convex portion 521 is not limited to a circular shape, and may be any shape such as an elliptical shape, an oblong shape, or a polygonal shape.

The third intermediate portion 530 is a cylindrical portion disposed below the second intermediate portion 520 and disposed on the outer periphery of the second terminal portion 212 of the positive terminal 210 so as to surround the second terminal portion 212 of the positive terminal 210 . Specifically, the third intermediate portion 530 is arranged in the opening portion 110 a of the cover body 110 in close contact with the inner surface of the opening portion 110 a and the outer surface of the second terminal portion 212 . Thereby, the third intermediate portion 530 can insulate the cover body 110 and the second terminal portion 212 , and fill the gap between the cover body 110 and the second terminal portion 212 to prevent leakage.

The fourth intermediate portion 540 is an annular portion disposed below the third intermediate portion 530 and the cover 110 and disposed on the outer periphery of the second terminal portion 212 so as to surround the second terminal portion 212 from its periphery. Specifically, the fourth intermediate portion 540 is arranged in close contact with the lower surface of the cover body 110 and the outer surface of the second terminal portion 212 . Thus, the fourth intermediate portion 540 can insulate the cover body 110 and the second terminal portion 212 and fill the gap between the cover body 110 and the second terminal portion 212 to prevent leakage. It should be noted that the fourth middle portion 540 is formed such that the lower surface thereof is flush with the second plane 212 a of the second terminal portion 212 . In other words, the lower surface of the fourth intermediate portion 540 and the second plane 212a are configured such that the boundary portion is continuous.

Next, a method of manufacturing the electricity storage element 10 will be described with reference to FIGS. 5 to 8 . In the following, the description will focus on the process of attaching the positive terminal member 200 and the negative terminal member 300 to the lid body 110 of the container 100 in the method of manufacturing the energy storage device 10 .

FIG. 5 is a perspective view showing a step of arranging the positive terminal member 201 and the negative terminal member 301 on the cover 110 according to the embodiment of the present invention. In addition, FIG. 6 is a cross-sectional view illustrating a step of integrating the positive terminal member 201 and the intermediate member 500 with the lid body 110 according to the embodiment of the present invention. 7 is a perspective view showing a step of deforming the positive electrode current collector 230 and the negative electrode current collector 330 of the positive electrode terminal member 201 and the negative electrode terminal member 301 according to the embodiment of the present invention. In addition, FIG. 8 is a perspective view showing a process of connecting the positive terminal member 200 and the negative terminal member 300 to the electrode body 400 according to the embodiment of the present invention.

First, as shown in FIG. 5( a ), the positive terminal member 201 and the negative terminal member 301 are arranged on the lid body 110 . Here, the positive electrode terminal member 201 is a member showing a state before being deformed into the above-mentioned positive electrode terminal member 200 (before being deformed into the positive electrode current collector 220 ), and has a rod-shaped positive electrode current collector 230 instead of the flat plate-shaped positive electrode current collector 220 . The positive electrode current collector 230 has a shape such that the first current collecting portion 221 of the positive electrode current collector 220 extends downward to the position of the lower end of the third current collecting portion 223 . Similarly, the negative electrode terminal member 301 has a rod-shaped negative electrode current collector 330 instead of the flat negative electrode current collector 320 in the negative electrode terminal member 300 . It should be noted that the positive terminal member 201 and the negative terminal member 301 also have the positive terminal 210 and the negative terminal 310 , but have the same structure as those of the positive terminal member 200 and the negative terminal member 300 , and thus detailed description thereof will be omitted.

Then, as shown in FIG. 5 (b), the positive electrode current collector 230 and the negative electrode current collector 330 of the positive electrode terminal member 201 and the negative electrode terminal member 301 are inserted into the openings 110a and 110c of the lid body 110, and are arranged in the openings 110a and 110c of the lid body 110, and are arranged in the position shown in FIG. ) shows the specified position of the cover body 110. Here, FIGS. 6( a ) to 6 ( d ) show an example of a terminal attachment step of attaching the positive terminal 210 to the cover 110 in a state where the positive terminal 210 penetrates the cover 110 . In addition, although FIG. 6(a) - FIG. 6(d) have shown the positive electrode side, it is the same about the negative electrode side.

Then, as shown in FIG. 6( b ), the first mold 710 is arranged so as to be in contact with the first flat surface 211 a from above the positive terminal 210 , and the second mold 710 is arranged to be in contact with the second flat surface 212 a from below the positive electrode terminal 210 . The second mold 720 is configured in the same manner. In other words, FIG. 6 shows an example of the clamping process of clamping the first flat surface 211 a and the second flat surface 212 a by the first mold 710 and the second mold 720 . It should be noted that the second plane 212a is a plane protruding from the positive electrode current collector 230 over the entire periphery of the positive electrode current collector 230, and the second mold 720 is in contact with the second plane 212a throughout the entire circumference of the positive electrode current collector 230. configuration.

Here, the first mold 710 is arranged so as to cover the outer periphery of the first terminal portion 211 and to be in contact with the upper surface of the cover body 110 with a gap therebetween. In addition, the second mold 720 is arranged to be in contact with the lower surface of the cover body 110 so as to cover the outer periphery of the second terminal portion 212 with a gap therebetween. As a result, the positive terminal 210 and the cover 110 are clamped and regulated by the first mold 710 and the second mold 720 with a gap between them and the outer periphery of the positive terminal 210 .

Then, as shown in FIG. 6( c), resin is injected into the gap between the first mold 710 and the outer periphery of the second mold 720 and the positive terminal 210, and the gap between the cover body 110 and the positive terminal 210, thereby forming an intermediate member. 500. In other words, the intermediate member 500 composed of the first intermediate portion 510 , the second intermediate portion 520 , the third intermediate portion 530 and the fourth intermediate portion 540 is formed by insert molding. It should be noted that the resin is also injected into the concave portion 110 b of the cover body 110 to form the convex portion 521 of the second middle portion 520 . Thus, FIG. 6( c ) shows an example of a forming process in which the intermediate member 500 is formed between the lid 110 and the positive terminal 210 and the lid 110 and the positive terminal 210 are integrally molded with the intermediate member 500 .

Since the second mold 720 is disposed in contact with the second flat surface 212 a over the entire circumference of the positive electrode current collector 230 , resin can be prevented from flowing below the second flat surface 212 a during insert molding.

Then, as shown in FIG. 6( d ), the first mold 710 and the second mold 720 are removed from the positive electrode terminal 210 , and the state shown in FIG. 7( a ) is established. In this way, in the positive terminal member 201 and the negative terminal member 301, the cover 110, the positive terminal 210, and the negative terminal 310, together with the intermediate members 500 and 600 disposed between the cover 110, the positive terminal 210, and the negative terminal 310, are assembled. integration.

Next, as shown in Figure 7 (b), the positive electrode current collector 230 and the negative electrode current collector 330 of the positive electrode terminal member 201 and the negative electrode terminal member 301 are deformed into the positive electrode current collector 220 and the negative electrode current collector 320, forming the positive electrode terminal Component 200 and the negative terminal component 300. Specifically, rod-shaped positive electrode current collector 230 and negative electrode current collector 330 are deformed into flat plate-shaped positive electrode current collector 220 and negative electrode current collector 320 by pressing or the like. Thus, FIG. 7( b ) shows an example of a current collector deforming step of deforming positive electrode current collector 230 and negative electrode current collector 330 connected to positive electrode terminal 210 and negative electrode terminal 310 after the terminal mounting step.

Then, as shown in FIG. 8 , the positive electrode current collector 220 and the negative electrode current collector 320 of the positive electrode terminal member 200 and the negative electrode terminal member 300 are joined to the positive electrode bundled portion 410 and the negative electrode bundled portion 420 of the electrode assembly 400 . In other words, the positive electrode current collector 220 and the negative electrode current collector 320 are formed in a flat plate shape, so that the contact area with the positive electrode bundled part 410 and the negative electrode bundled part 420 can be ensured, and in addition, it is easy to carry out contact with the positive electrode bundled part 410 and the negative electrode bundled part. 420 engagement.

As described above, according to the storage device 10 according to the embodiment of the present invention, the lid body 110 and the positive terminal 210 of the container 100 are integrated together with the intermediate member 500 between the lid body 110 and the positive terminal 210, and the positive terminal 210 It has a first plane 211a and a second plane 212a. It should be noted that the first plane 211a is a surface arranged along the outer surface of the cover body 110, and the second plane 212a is arranged along the inner surface of the cover body 110, and is arranged throughout the outer circumference of the positive electrode current collector 220 than the positive electrode current collector part 220. prominent face. In addition, the manufacturing method of the storage device 10 according to the embodiment of the present invention includes: a clamping process of clamping the first plane 211a and the second plane 212a of the positive terminal 210; An intermediate member 500 is formed between the positive terminals 210 , and the cover body 110 and the positive terminal 210 are integrally formed with the intermediate member 500 .

Thus, when the positive terminal 210 and the cover body 110 are integrally molded, the first flat surface 211a and the second flat surface 212a are clamped by the molds (the first mold 710 and the second mold 720), so that the positive terminal 210 can be easily opposed to each other. The cover body 110 is fixed at the correct position (angle). In particular, the second flat surface 212a is a surface protruding from the positive electrode current collecting part 220 over the outer periphery of the positive electrode current collector 220, so the positive electrode terminal 210 can be pressed against the lid by pressing the mold over the entire outer periphery of the positive electrode current collector 220. The body 110 is stably fixed in the correct position. Thus, for example, in the case of welding the bus bar to the positive terminal 210 , the parallelism of the positive terminal 210 can be easily improved, so that welding failure can be suppressed when the positive terminal 210 and the bus bar are welded.

In addition, since the positive electrode terminal 210 and the positive electrode current collector 220 are integrated, the positive electrode terminal 210 can be fixed at a correct position with respect to the lid body 110 , and the positive electrode current collector 220 can also be fixed at a correct position.

In addition, after the positive terminal 210 is mounted on the cover 110, the positive current collector 230 connected to the positive terminal 210 is deformed, so the positive current collector 230 can be fixed in a state where the positive terminal 210 is fixed to the cover 110. out of shape. Thereby, the positive electrode current collector 230 can be easily and accurately deformed, and the positive electrode current collector 220 can be fixed at a correct position with respect to the lid body 110 .

In addition, when arranging the second mold 720 with respect to the positive electrode terminal 210 as described above, a space for arranging the second mold 720 is required, but the positive electrode current collector 220 after deformation has a flat plate shape, so it may not be possible to An arrangement space for the second mold 720 is ensured. On the other hand, the positive electrode current collector 230 before deformation is in the shape of a rod, and thus a space for disposing the second mold 720 may be secured in this shape. In other words, even if the shape of the deformed positive electrode current collector 220 cannot ensure the disposition space of the mold for pressing the positive electrode terminal 210, if it is the shape of the positive electrode current collector 230 before deformation, the space can be secured. The configuration space of the mold. Thereby, the arrangement and shape of the positive electrode current collector 220 can be suppressed from being restricted by the mold. In this manner, by increasing the degree of freedom in the arrangement and shape of the positive electrode current collector 220 , the space in the container 100 can be utilized to the maximum, and the capacity of the storage device 10 can be increased or reduced in size.

In addition, since the negative electrode terminal member 300 has the same structure as the positive electrode terminal member 200, the same effect can be exhibited.

As mentioned above, although the electric storage element 10 which concerns on embodiment of this invention was demonstrated, this invention is not limited to this embodiment. In other words, it should be considered that the embodiments disclosed this time are only examples and not limitations. The scope of the present invention is shown not by the above description but by claims of the present invention, and it is intended that all changes within the meaning and scope equivalent to the scope of claims are included.

For example, in the above-described embodiment, it is assumed that the positive terminal member 200 and the negative terminal member 300 are attached to the lid body 110 of the container 100 . However, at least one of the positive terminal member 200 and the negative terminal member 300 may be attached to a wall of the container 100 other than the lid 110 (any wall of the container body 111 ).

In addition, in the above-described embodiment, it is assumed that the lid body 110 , the positive terminal 210 and the negative terminal 310 are integrated together with the intermediate members 500 and 600 by insert molding. In addition, it is assumed that the intermediate members 500 and 600 are resin members formed of resin capable of insert molding. However, this integrated method is not limited to insert molding. In addition, at least one of the intermediate members 500 and 600 may be a member other than resin.

In addition, in the above-mentioned embodiment, it is set that the current collectors (positive electrode current collector 230, negative electrode current collector 330) Deformed current collector deformation process. However, the current collector deforming step may be performed before the terminal mounting step.

In addition, in the above-described embodiment, it is assumed that after the clamping process of sandwiching the first plane and the second plane of the electrode terminal and the forming process of integrally molding the cover body 110 and the electrode terminal together with the intermediate member are performed in the terminal mounting process, , and perform the current collector deformation process. However, in the terminal attaching step, the electrode terminal may be attached to the cover body 110 without performing the clamping step and the forming step, and then the current collector deforming step may be performed.

In addition, in the above-described embodiment, it is assumed that both the positive terminal member 200 and the negative terminal member 300 have the above-mentioned structure. However, at least one of the positive terminal member 200 and the negative terminal member 300 may have the above-mentioned structure.

In addition, in the above-described embodiment, it is assumed that the electricity storage element 10 includes only one electrode body 400 . However, the storage device 10 may be provided with two or more electrode bodies. In this case, the current collector is formed in a shape corresponding to the electrode body, and thus deformed (processed).

In addition, the present invention can be realized not only as such an electric storage element 10, but also as the positive terminal member 200 (positive electrode terminal 210, positive electrode current collector 220) or the negative electrode terminal member 300 (negative electrode terminal 310, negative electrode current collector 220) included in the electric storage element 10. Collector 320) is realized.

Industrial availability

The present invention can be applied to an electric storage device or the like capable of fixing an electrode terminal at a correct position with respect to a wall portion of a container.

Symbol Description

10 storage element

100 containers

110 Cover

210 positive terminal

211a First plane

212a Second Plane

220, 230 positive collector

310 negative terminal

320, 330 Negative electrode collector

400 electrode body

500, 600 intermediate parts

Claims (5)

1. An electric storage device comprising a container having a wall, an electrode terminal penetrating the wall, and a current collector connected to the electrode terminal, wherein, The wall portion and the electrode terminal are integrated together with an intermediate member arranged between the wall portion and the electrode terminal, The electrode terminal has: a first plane disposed along the outer surface of the wall on the exterior of the container; and The second plane is disposed along the inner surface of the wall portion inside the container and is a surface protruding from the current collector over the outer periphery of the current collector. 2. The electricity storage element according to claim 1, wherein: The electrode terminal and the current collector are integrated. 3. A method for manufacturing an electrical storage device, comprising a container having a wall, an electrode terminal penetrating the wall, and a current collector connected to the electrode terminal, wherein: including a terminal attaching step of attaching the electrode terminal to the wall in a state in which the electrode terminal penetrates the wall, The terminal installation process includes: A clamping step of clamping a first plane and a second plane of the electrode terminal, wherein the first plane is arranged along the outer surface of the wall portion outside the container, and the second plane is arranged along the outer surface of the wall portion inside the container. The inner surface of the wall portion is configured to be a surface protruding from the current collector throughout the outer circumference of the current collector; and In the forming step, an intermediate member is formed between the wall portion and the electrode terminal, and the wall portion and the electrode terminal are integrally molded together with the intermediate member. 4. The method of manufacturing an electricity storage element according to claim 3, wherein: The present invention further includes a current collector deforming step of deforming the current collector connected to the electrode terminal after the terminal mounting step. 5. A method for manufacturing an electrical storage element, comprising: a container having a wall, an electrode terminal, and a collector connected to the electrode terminal, comprising: a terminal mounting step of mounting the electrode terminal on the wall in a state in which the electrode terminal penetrates the wall; and In the current collector deforming step, after the terminal mounting step, the current collector connected to the electrode terminal is deformed.