JP2020173900A - Laminated battery - Google Patents

Abstract

To prevent an external wiring from colliding with ear portions while ensuring the sealing performance of the ear portions.SOLUTION: Ear portions 14b and 14c are bent to the side where an emboss 12 protrudes. The widths W1 and W2 of the first and second ear portions 14b and 14c before being bent satisfy W1≥W2, and the heights H1 and H2 of the folded first and second ear portions 14b and 14c satisfy H1<H2. A circuit board 20 is arranged on the same side as the side where the first ear portion 14b is bent with respect to a terrace portion 14a, facing the terrace portion 14a. An external wiring 24 is led out from the side of the first ear portion 14b in parallel with the longitudinal direction of the terrace portion 14a.SELECTED DRAWING: Figure 5

Description

The present invention relates to a laminated battery including a laminated cell in which a power generation element is exteriorized with a laminated sheet and external wiring.

Non-aqueous electrolyte batteries typified by lithium-ion secondary batteries are used as power sources for portable information terminals and portable game machines because of their high energy density. In such applications, in order to meet the conflicting demands of miniaturization and large capacity, a laminated lithium ion battery having a substantially rectangular plan view shape in which a thin plate-shaped power generation element is covered with a flexible laminated sheet Sub-batteries (hereinafter referred to as "laminated cells") are often used. A circuit board on which a protection circuit component (safety circuit component) for protecting the laminated cell from over-discharging and over-charging is mounted is integrated with the laminated cell to form a laminated battery.

The laminated cell has a sealing area on the outside of the power generation element, in which laminated sheets are laminated and sealed. The sealing area is along three or four sides of a substantially rectangular laminate cell. Embossing corresponding to the power generation element projects on one side of the seal area. A positive electrode tab and a negative electrode tab connected to the power generation element are derived from one side of the laminated cell. Of the seal regions, the seal region along the side from which the positive electrode tab and the negative electrode tab are derived is called a terrace portion. From the viewpoint of miniaturizing the laminated battery, the circuit board is generally arranged on the same side as the embossing so as to face the terrace portion (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-114475

External wiring may be connected to the circuit board to provide an electrical connection between the laminated battery and the equipment in which it is incorporated. From the viewpoint of routing the external wiring in the device, it may be required to pull out the external wiring from the circuit board along the longitudinal direction of the terrace portion.

Generally, in order to reduce the outer dimensions of the laminated cell, the ears connected to both ends of the terrace portion of the sealing area are bent to the same side as the embossing. Therefore, when the external wiring is pulled out from the circuit board along the longitudinal direction of the terrace portion, the external wiring may collide with the bent ear portion. This can cause scratches on the laminated sheet constituting the selvage portion and a short circuit between the laminated sheet and the external wiring.

By narrowing the width of the ears, the height of the folded ears can be lowered, so that the possibility that the external wiring collides with the ears is reduced. However, if the width of the ear portion is narrowed, the sealing property of the ear portion is lowered.

An object of the present invention is to prevent the external wiring from colliding with the selvage portion while ensuring the sealing property of the selvage portion in the laminated battery in which the external wiring is pulled out from the circuit board along the longitudinal direction of the terrace portion. There is.

The laminated battery of the present invention includes a laminated cell having a substantially rectangular plan view shape in which a power generation element is covered with a flexible laminated sheet, and a circuit board on which protective circuit components are mounted and external wiring is connected. To be equipped. The laminate cell includes a seal region in which the laminate sheets are laminated and sealed, and an embossing corresponding to the power generation element, which protrudes to at least one side with respect to the seal region. The seal region is connected to a terrace portion along the side from which the positive electrode tab and the negative electrode tab connected to the power generation element are derived, and is connected to both ends of the terrace portion and is perpendicular to the side along which the terrace portion is along. Includes a first ear and a second ear along the direction. The first ear portion and the second ear portion are bent to the side where the embossing protrudes. The unfolded width of the first selvage is equal to or greater than the unfolded width of the second selvage. The height of the folded first ear is lower than the height of the bent second ear. The circuit board is arranged on the same side as the side where the first ear portion is bent with respect to the terrace portion, facing the terrace portion. The external wiring is led out from the side of the first ear portion in parallel with the longitudinal direction of the terrace portion.

According to the present invention, the height of the folded first ear is lower than the height of the bent second ear, and the external wiring is relatively low from the side of the first ear to the longitudinal direction of the terrace. It is derived in parallel with. Therefore, the possibility that the external wiring collides with the first ear portion is low.

The unfolded width of the first selvage is equal to or greater than the unfolded width of the second selvage. Therefore, even though the bending height of the first ear portion is relatively low, the sealing property of the first ear portion can be ensured.

As a result of the above, the laminated battery of the present invention has high safety.

FIG. 1 is an exploded perspective view of the laminated battery according to the first embodiment of the present invention. FIG. 2 is a perspective view of a laminated cell constituting the laminated battery according to the first embodiment of the present invention. FIG. 3A is a perspective view of the laminated cell according to the first embodiment of the present invention, in which the sealing regions (ears) along two sides parallel to each other are bent. FIG. 3B is a side view of the laminated cell as viewed along the arrow 3B of FIG. 3A. FIG. 4 is a perspective view showing a process of manufacturing the laminated battery according to the first embodiment of the present invention. FIG. 5A is a perspective view of the laminated battery according to the first embodiment of the present invention. FIG. 5B is a side view of the laminated battery as seen along the arrow 5B of FIG. 5A. FIG. 6 is a perspective view of a laminated cell constituting the laminated battery according to the second embodiment of the present invention. FIG. 6B is a side view of the laminated cell according to the second embodiment of the present invention as viewed along the arrow 6B of FIG. 6A. FIG. 7A is a perspective view of the laminated cell according to the second embodiment of the present invention in which the sealing regions (ears) along two sides parallel to each other are bent to the same side. FIG. 7B is a side view of the laminated cell as viewed along the arrow 7B of FIG. 7A. FIG. 8A is a perspective view of the laminated battery according to the second embodiment of the present invention. FIG. 8B is a side view of the laminated battery as seen along the arrow 8B of FIG. 8A. FIG. 9A is a perspective view of the laminated cell according to the second embodiment of the present invention in which the sealing regions (ears) along two sides parallel to each other are bent to the opposite sides. 9B is a side view of the laminated cell as viewed along arrow 9B of FIG. 9A. FIG. 10A is a side view of another laminated cell constituting the laminated battery of the present invention. FIG. 10B is a side view of yet another laminated cell constituting the laminated battery of the present invention. FIG. 10C is a side view of yet another laminated cell constituting the laminated battery of the present invention.

In the above-mentioned laminated battery of the present invention, when viewed along the longitudinal direction of the first ear portion, the first ear portion may have a portion curved in an arc shape. According to such an aspect, the first ear portion lower than the second ear portion can be easily realized.

The first ear portion may be folded in half. According to such an aspect, the first ear portion lower than the second ear portion can be easily realized.

The first ear portion may be bent at a position away from the outer edge of the embossing. According to such an aspect, the first ear portion lower than the second ear portion can be easily realized.

The tip of the first ear may face the emboss or the first ear. According to such an aspect, even if the external wiring collides with the first ear portion, it is unlikely that the external wiring is damaged by the first ear portion or the external wiring and the first ear portion are short-circuited.

The surface of the circuit board to which the external wiring is connected may face the terrace portion. According to such an embodiment, a flat surface having no protrusions can be formed by a surface of the circuit board opposite to the surface to which the external wiring is connected and an embossed top surface.

A cushioning material that can be compressed and deformed may be provided between the circuit board and the terrace portion. According to such an aspect, it is possible to prevent the circuit board from abnormally approaching the terrace portion and damaging the laminated sheet constituting the first ear portion and the terrace portion.

The embossing may project to only one side with respect to the sealing area. According to such an embodiment, the laminated battery of the present invention can be constructed by using a single embossed laminated cell.

The embossing may include a first embossing projecting to one side with respect to the sealing area and a second embossing projecting to the other side with respect to the sealing area. The first ear portion may be bent to the side where the first embossing protrudes. The second ear portion may be bent to the side where the first embossing or the second embossing protrudes. According to such an aspect, the laminated battery of the present invention can be constructed by using both embossed laminated cells.

Hereinafter, the present invention will be described in detail with reference to suitable embodiments. However, it goes without saying that the present invention is not limited to the following embodiments. For convenience of explanation, each figure referred to in the following description is a simplified representation of the main members constituting the embodiment of the present invention. Therefore, the present invention may include any member not shown in each of the following figures. Further, within the scope of the present invention, each member shown in each of the following figures may be changed or omitted. In the drawings cited in the description of each embodiment, the members corresponding to the members shown in the drawings cited in the preceding embodiments are designated by the same reference numerals as those assigned in the drawings of the preceding embodiments. is there. Overlapping description of such members has been omitted, and description of the preceding embodiments should be taken into account as appropriate.

(Embodiment 1)
FIG. 1 is an exploded perspective view of a laminated battery (hereinafter, simply referred to as “battery”) 1 according to the first embodiment of the present invention. The battery 1 includes a laminated cell (hereinafter, simply referred to as “cell”) 10a and a circuit board 20.

FIG. 2 is a perspective view of the cell 10a. The cell 10a has a substantially rectangular plan view shape, and has a thin plate shape having a thickness thinner than the vertical and horizontal dimensions of the substantially rectangular shape. The cell 10a is formed by enclosing a thin plate-shaped power generation element (not shown) having a substantially rectangular plan view shape in an exterior made of a laminated sheet 13. The power generation elements are a positive electrode in which a positive electrode mixture layer containing a positive electrode active material is coated on both sides of a predetermined region of a positive electrode current collector, and a negative electrode mixture layer containing a negative electrode active material on both sides of a predetermined region of the negative electrode current collector. Is an electrode laminate formed by alternately laminating the negative electrode formed by coating the above with the separator. The type of battery is not particularly limited, but a secondary battery, particularly a lithium ion secondary battery or a solid-state battery is preferable.

The laminated sheet 13 is thinner and more flexible than the power generation element. The laminated sheet 13 may be a flexible multilayer sheet in which a thermosetting resin layer (for example, a modified polyolefin layer) is laminated on a surface of a base layer made of aluminum or the like facing the power generation element. Good. One rectangular laminated sheet 13 is folded in half so as to sandwich the power generation element, overlapped on the outside of the power generation element, and sealed by a heat sealing method or the like. The sealing regions 14a, 14b, and 14c on which the laminate sheet 13 is sealed are along three sides of a substantially rectangular cell 10a. The seal regions 14a, 14b, 14c are along a common plane. A substantially rectangular embossed 12 corresponding to the power generation element projects to one side with respect to the seal regions 14a, 14b, 14c. A cell in which the embossing 12 protrudes only on one side with respect to the sealing regions 14a, 14b, 14c, such as the cell 10a, is generally "single embossed type" or "single embossed type" or "one-sided embossed type" or "one-sided embossing type" It is called "single aperture type". In the present invention, for convenience of explanation, the direction perpendicular to the plane common to the seal regions 14a, 14b, 14c is referred to as "height direction" or "vertical direction". The direction parallel to the plane common to the seal regions 14a, 14b, 14c is called the "horizontal direction".

A positive electrode tab 11p and a negative electrode tab 11n are derived from the seal region 14a. The positive electrode tab 11p and the negative electrode tab 11n have a strip shape (or an elongated rectangular shape) and have a direction orthogonal to the longitudinal direction of the seal region 14a (that is, a pair of seal regions 14b, 14c connected to both ends of the seal region 14a). Extends along the direction parallel to). The positive electrode tab 11p is made of, for example, a thin plate of aluminum, and is electrically connected to a plurality of positive electrode current collectors (not shown) constituting a power generation element. Further, the negative electrode tab 11n is made of, for example, a thin plate of nickel, and is electrically connected to a plurality of negative electrode current collectors (not shown) constituting a power generation element.

In the present invention, the seal region 14a from which the positive electrode tab 11p and the negative electrode tab 11n are derived is referred to as a “terrace portion”. Further, the seal areas 14b and 14c connected to both ends of the terrace portion 14a are referred to as "ears". The first ear portion 14b and the second ear portion 14c extend along a side perpendicular to the side of the cell 10a along which the terrace portion 14a is aligned. The width W1 of the first ear portion 14b is equal to or larger than the width W2 of the second ear portion 14c (W1 ≧ W2). Preferably, the width W1 is the same as the width W2 (W1 = W2). The widths W1 and W2 mean the distances along the ears 14b and 14c from the inside where the power generation element of the cell 10a is built to the outer peripheral ends of the ears 14b and 14c. Therefore, the widths W1 and W2 have the ears 14b along the direction parallel to the longitudinal direction of the terrace 14a as shown in FIG. 2 before the ears 14b and 14c are bent (see FIGS. 3A and 3B). , 14c. If the ears 14b and 14c are already bent (see FIGS. 3A and 3B described later), the widths W1 and W2 may be measured along the bent ears 14b and 14c, or , The widths W1 and W2 may be measured with the ears 14b and 14c extended in the horizontal direction. The widths W1 and W2 are set so that the ears 14b and 14c have the required sealing property.

In order to reduce the outer dimension of the cell 10a, the ears 14b and 14c are bent to the same side as the emboss 12 as shown in FIG. 3A. FIG. 3B is a side view of the cell 10a as viewed along the arrow 3B of FIG. 3A. As shown in FIG. 3B, the first ear portion 14b and the second ear portion 14c are bent so as to stand up substantially at right angles to the terrace portion 14a. However, the first ear portion 14b and the second ear portion 14c are bent differently.

The second ear portion 14c is bent at the outer edge of the emboss 12 (that is, the boundary between the emboss 12 and the seal region). The bent second ear portion 14c is substantially in contact with the side surface of the emboss 12 with almost no gap in the horizontal direction. The folded second ear portion 14c may be fixed to the side surface of the emboss 12 with a double-sided adhesive tape or the like.

On the other hand, the first ear portion 14b is bent (curved) in an arc shape at a position slightly distant from the outer edge of the emboss 12. The portion of the first ear portion 14b that stands upright along the vertical direction is horizontally separated from the side surface of the emboss 12. Such a first ear portion 14b can be formed, for example, by bending the first ear portion 14b upward while sandwiching an elongated columnar rod between the emboss 12 and the first ear portion 14b.

The height H1 of the folded first ear portion 14b is lower than the height H2 of the bent second ear portion 14c (H1 <H2). The heights H1 and H2 are the dimensions of the ear portions 14b and 14c from the terrace portion 14a along the direction (vertical direction) perpendicular to the terrace portion 14a.

Returning to FIG. 1, the circuit board 20 is an elongated thin plate-like object, and has a longitudinal dimension substantially equal to or shorter than that of the terrace portion 14a. A protection circuit component (safety circuit component) 22 composed of electronic components such as FET elements is mounted on the first surface of the circuit board 20, and a charging circuit may be optionally formed. In the present embodiment, two protection circuit components 22 are mounted, but the number of protection circuit components 22 is not limited to this and is arbitrary. Further, a positive electrode input terminal 21p and a negative electrode input terminal 21n are provided on the first surface of the circuit board 20.

The external wiring 24 is connected to a terminal (not visible in FIG. 1) provided on the first surface of the circuit board 20. The sealing portion 24b seals and insulates the electrical connection portion between the terminal (not shown) provided on the first surface of the circuit board 20 and the external wiring 24. The sealing portion 24b is made of a known glue, an insulating resin or an adhesive. The external wiring 24 is connected in the vicinity of one end of the circuit board 20 in the longitudinal direction (first ear portion 14b side), and is parallel to the longitudinal direction of the terrace portion 14a (or the circuit board 20) from the circuit board 20. It has been derived. A connector 24a is provided at the tip of the external wiring 24. The connector 24a is connected to a connector (device-side connector) provided in the device in which the battery 1 is incorporated. The battery 1 can be charged and discharged via the external wiring 24. The external wiring 24 is an aggregate of a plurality of flexible cables (three in the first embodiment). Each cable constituting the external wiring 24 includes a conductive wire such as copper (conductive wire) and an insulating material such as polyurethane (insulating coating) that coats the conductive wire, and is also called a coated wire. .. The external wiring 24 of the present embodiment is a flat cable in which the insulating coatings of a plurality of cables are fused and connected to each other. The type of the plurality of cables is not particularly limited, but may include, for example, a positive electrode cable, a negative electrode cable, a temperature detection cable for detecting the temperature of the laminated cell 10a, and the like. The number of cables constituting the external wiring 24 and the function of each cable are not limited to this embodiment and can be arbitrarily changed. The connector 24a may be omitted.

The battery 1 further includes a breaker 27. The breaker 27 includes a thin plate-shaped element main body that functions as a current cutoff device that cuts off the current when abnormally overheated. The first lead 27a and the second lead 27b are led out from the element main body in opposite directions. The first lead 27a and the second lead 27b are strip-shaped thin plates made of a conductive metal. The positive electrode tab 11p of the cell 10a is connected to the first lead 27a. The second lead 27b is connected to the positive electrode input terminal 21p provided on the first surface of the circuit board 20 via the conductive tab 28. The conductive tab 28 is a strip-shaped thin plate made of a conductive metal (for example, nickel).

The negative electrode tab 11n of the cell 10a is connected to the negative electrode input terminal 21n provided on the first surface of the circuit board 20.

Two cushion materials 26a and 26b are provided between the terrace portion 14a and the circuit board 20. The cushion materials 26a and 26b have a substantially rectangular parallelepiped shape and are made of an elastic body that can be compressively deformed. The cushioning materials 26a and 26b are not limited, but materials such as foam materials and sponges that are easily deformed when an external force is applied and are restored to their initial shape when the external force is removed can be used. The cushion materials 26a and 26b preferably have an insulating property. The cushion materials 26a and 26b may be, for example, urethane foam or polyethylene sponge, and "PORON (registered commercial)" manufactured by Rogers INOAC Corporation can be exemplified as an example. Preferably, a double-sided adhesive tape or an adhesive is applied to the upper and lower surfaces of the cushion materials 26a and 26b.

FIG. 4 shows one process of manufacturing the battery 1. The breaker 27 is placed on the surface of the terrace portion 14a on the same side as the side on which the emboss 12 protrudes. The method of fixing the breaker 27 to the terrace portion 14a is not limited, and for example, a double-sided adhesive tape or an adhesive can be used. The positive electrode tab 11p is bent in a substantially "U" shape. The negative electrode tab 11n and the conductive tab 28 extend parallel to each other between the cell 10a and the circuit board 20. The cushion materials 26a and 26b are attached to the surface of the terrace portion 14a on the same side as the side on which the embossing 12 protrudes. The first cushion material 26a is arranged in the vicinity of the first ear portion 14b, and the second cushion material 26b is arranged in the vicinity of the second ear portion 14c.

From the state of FIG. 4, the circuit board 20 is made to face the terrace portion 14a so that the first surface of the circuit board 20 to which the protection circuit component 22 is mounted and the external wiring 24 is connected faces the terrace portion 14a. The negative electrode tab 11n and the conductive tab 28 are bent or curved so as to have a substantially “U” shape when viewed along the longitudinal direction of the terrace portion 14a.

FIG. 5A is a perspective view of the battery 1 in which the circuit board 20 is superposed on the terrace portion 14a. The second surface of the circuit board 20 (the surface opposite to the first surface on which the protection circuit component 22 is mounted and the external wiring 24 is connected) is substantially the same position in the vertical direction as the top surface of the emboss 12 of the cell 10a. It is in. The flat second surface of the circuit board 20 and the top surface of the embossing 12 form a common plane. The cell 10a and the circuit board 20 may be wrapped with an exterior sheet (not shown), if necessary. The exterior sheet is not limited, but is made of, for example, an insulating resin or paper.

FIG. 5B is a side view of the battery 1 as viewed along the arrow 5B of FIG. 5A. The external wiring 24 is connected to the first surface (the surface facing the terrace portion 14a) of the circuit board 20. The external wiring 24 is connected to the vicinity of one end (first ear portion 14b side) in the longitudinal direction of the circuit board 20 having an elongated rectangular shape in a plan view, and is connected to the terrace portion from the side of the first ear portion 14b. It is derived parallel to the longitudinal direction of 14a (or the circuit board 20). This may be advantageous in simplifying the handling of the external wiring 24 in the device in which the battery 1 is incorporated and in reducing the size of the device.

The external wiring 24 is led out from the circuit board 20 in the horizontal direction beyond the first ear portion 14b. The first ear portion 14b is bent with respect to the terrace portion 14a so as to be substantially parallel in the vertical direction. The external wiring 24 extends parallel to the longitudinal direction of the terrace portion 14a, and the first ear portion 14b extends perpendicularly to the longitudinal direction of the terrace portion 14a. Therefore, when viewed from above, the external wiring 24 and the first ear portion 14b are substantially vertical. The external wiring 24 and the tip (upper end) of the first ear portion 14b face each other in the vertical direction so as to intersect.

As described above, the bending height H1 of the first ear portion 14b is lower than the bending height H2 of the second ear portion 14c. Therefore, the external wiring 24 is separated from the first ear portion 14b in the vertical direction. It is unlikely that the external wiring 24 will collide with the first ear portion 14b.

Unlike the first embodiment, the first ear portion 14b is bent in the same manner as the second ear portion 14c (see FIG. 3B), and as a result, the bending height H1 of the first ear portion 14b is the second ear portion 14c. If it is equal to or higher than the bending height H2, the external wiring 24 is likely to collide with the first ear portion 14b. The collision between the external wiring 24 and the first ear portion 14b is particularly large when an impact such as dropping is applied to the battery 1 or when a compressive force in the vertical direction is applied to the battery 1 (particularly the circuit board 20). It can happen. When the external wiring 24 collides with the first ear portion 14b, for example, the following problems may occur.

First, the external wiring 24 deforms the first ear portion 14b, and further damages the laminate sheet 13 constituting the first ear portion 14b. Damage to the laminate sheet 13 can cause accidents such as leakage of an electrolytic solution due to tearing of the laminate sheet 13, intrusion of water into the cell 10, and a short circuit in the cell 10.

Second, the first ear portion 14b damages the insulating coating of the cable constituting the external wiring 24, exposing the conductive wire. The tip of the first ear portion 14b is a cut end formed by cutting the raw fabric of the laminated sheet 13. Therefore, a conductive layer (for example, a base layer made of aluminum) constituting the laminated sheet 13 may be exposed at the tip of the first ear portion 14b. In this case, the insulating coating of the external wiring 24 is easily damaged by the tip of the first ear portion 14b. Eventually, the conductive layer at the tip of the first ear portion 14b is short-circuited with the conductive wire (particularly the negative electrode) of the external wiring 24, and corrosion starts.

In the first embodiment, since the bending heights H1 and H2 of the first and second ear portions 14b and 14c satisfy H1 <H2, the possibility that the external wiring 24 collides with the first ear portion 14b is low. Therefore, the first and second problems are less likely to occur. The battery 1 of the first embodiment is excellent in safety.

Moreover, the width W1 of the first ear portion 14b is the same as or larger than the width W2 of the second ear portion 14c. In general, the narrower the width of the sealing regions 14a, 14b, 14c, the lower the sealing performance of the sealing regions 14a, 14b, 14c. For example, in the case of a lithium ion secondary battery, the electrolytic solution in the cell 10a leaks out. There is a high possibility that an accident will occur. In the first embodiment, since the widths W1 and W2 satisfy W1 ≧ W2, the first ear portion 14b has a sealing property equal to or higher than that of the second ear portion 14c. Therefore, the first ear portion 14b has a high sealing property even though the bending height H1 is low. From this point as well, the battery 1 of the first embodiment is excellent in safety.

Cushion materials 26a and 26b are interposed between the circuit board 20 and the terrace portion 14a. The cushion materials 26a and 26b have the following functions.

First, the cushioning materials 26a and 26b prevent the circuit board 20 from abnormally approaching the terrace portion 14a. Unlike the first embodiment, when the cushioning materials 26a and 26b are not provided, for example, when a force is applied to the circuit board 20 toward the terrace portion 14a in the manufacturing process of the battery 1, or the completed battery 1 is provided. When an impact such as dropping is applied to the circuit board 20, the circuit board 20 may abnormally approach the terrace portion 14a. This may cause a collision between the external wiring 24 and the first ear portion 14b, or a collision between the circuit board 20 (including the mounting component mounted on the circuit board 20) and the terrace portion 14a. As a result, the laminated sheet 13 constituting the first ear portion 14b and the terrace portion 14a is damaged, and the electrolytic solution leaks due to the tearing of the laminated sheet 13, water enters the cell 10a, and a short circuit occurs in the cell 10a. sell. Also, the first ear portion 14b can damage the insulating coating of the external wiring 24. In the first embodiment provided with the cushion materials 26a and 26b, the above-mentioned collision can be avoided.

Second, the cushioning materials 26a and 26b facilitate the manufacture of the battery 1. When a double-sided adhesive tape or an adhesive is applied to the upper and lower surfaces of the cushion materials 26a and 26b, once the circuit board 20 is superposed on the terrace portion 14a via the cushion materials 26a and 26b as shown in FIGS. 5A and 5B, The circuit board 20 and the terrace portion 14a are connected via the cushion materials 26a and 26b. The cushioning materials 26a and 26b oppose the elastic repulsive force of the negative electrode tab 11n and the conductive tab 28 that try to separate the circuit board 20 from the terrace portion 14a, and prevent the circuit board 20 from separating from the terrace portion 14a. Therefore, the handleability of the battery 1 in the subsequent manufacturing process of the battery 1 (for example, the step of covering the battery 1 of FIGS. 5A and 5B with the exterior sheet) is improved, and the manufacturing of the battery 1 becomes easy.

Preferably, the first cushion material 26a presses the external wiring 24 toward the circuit board 20 so that the external wiring 24 does not hang down toward the first ear portion 14b. This is advantageous in further reducing the possibility that the external wiring 24 collides with the first ear portion 14b. The collision between the external wiring 24 and the first ear portion 14b may cause damage to the laminated sheet 13 described above or damage to the insulating coating of the external wiring 24. The first cushion material 26a is advantageous in preventing such a situation from occurring.

The two cushion materials 26a and 26b are arranged so as not to face the breaker 27. Therefore, the cushion materials 26a and 26b do not apply an external force to the breaker 27. This is advantageous for ensuring the reliability of the operation of the breaker 27.

(Embodiment 2)
FIG. 6A is a perspective view of a laminated cell (hereinafter, simply referred to as “cell”) 10b constituting the laminated battery 2 (see FIGS. 8A and 8B described later) according to the second embodiment of the present invention. FIG. 6B is a side view of the cell 10b as viewed along the arrow 6B of FIG. 6A. In the cell 10b of the second embodiment, substantially rectangular embosses 12a and 12b corresponding to the power generation elements project to both sides in the vertical direction with respect to the seal regions 14a, 14b and 14c. The protruding height of the first embossed 12a protruding to one side with respect to the sealing regions 14a, 14b, 14c and the protruding height of the second embossing 12b protruding to the other side may be the same or different. You may be. A cell having embossed 12a and 12b protruding on both sides with respect to the sealing regions 14a, 14b and 14c, such as the cell 10b, is generally "both embossed" or "both embossed" by paying attention to the molding shape of the laminated sheet 13. It is called "aperture type". The direction connecting the first emboss 12a and the second emboss 12b is referred to as a "height direction" or a "vertical direction". Similar to the first embodiment, the unfolded width W1 of the first ear portion 14b is equal to or larger than the unfolded width W2 of the second ear portion 14c (W1 ≧ W2).

As shown in FIGS. 7A and 7B, the ears 14b and 14c are bent to the same side as the first emboss 12a in order to reduce the outer dimensions of the cell 10b. The method of bending the ears 14b and 14c is the same as that of the first embodiment. The height H1 of the folded first ear portion 14b is lower than the height H2 of the bent second ear portion 14c (H1 <H2).

FIG. 8A is a perspective view seen from the first embossed 12a side of the laminated battery (hereinafter, simply referred to as “battery”) 2. FIG. 8B is a side view of the battery 2 as viewed along the arrow 8B of FIG. 8A. The circuit board 20 is arranged on the side where the first embossing 12a protrudes from the terrace portion 14a, facing the terrace portion 14a. The external wiring 24 is connected in the vicinity of one end of the circuit board 20 in the longitudinal direction (first ear portion 14b side), and from the side of the first ear portion 14b, the terrace portion 14a (or the circuit board 20). It is derived parallel to the longitudinal direction. The breaker 27 is provided on the surface of the terrace portion 14a on the same side as the side on which the first emboss 12a protrudes.

Similar to the first embodiment, in the second embodiment as well, the possibility that the external wiring 24 collides with the first ear portion 14b is low. Further, the first ear portion 14b has a sealing property equal to or higher than that of the second ear portion 14c. Therefore, the battery 2 of the second embodiment is excellent in safety.

In the second embodiment, as shown in FIGS. 9A and 9B, the second ear portion 14c may be bent to the same side as the second emboss 12b so as to have a bending height H2.

The battery 2 of the second embodiment is the same as the battery 1 of the first embodiment (see FIGS. 5A and 5B) except that both embossed cells 10b are used. The description of the first embodiment is appropriately applied to the second embodiment.

The above embodiments 1 and 2 are merely examples. The present invention is not limited to the above-described first and second embodiments, and can be appropriately modified.

The method of bending the first ear portion 14b is not limited to the first and second embodiments. The first ear portion 14b can be bent into an arbitrary shape so that the heights H1 and H2 of the first and second ear portions 14b and 14c after bending satisfy H1 <H2.

For example, as in the cell 10c shown in FIG. 10A, the first ear portion 14b may be bent (curved) into a substantially “C” shape (substantially arcuate shape). Such a first ear portion 14b can be formed, for example, by bending the first ear portion 14b so as to wrap it around an elongated cylindrical rod. After forming the first ear portion 14b, the rod is pulled out from the first ear portion 14b. In the first embodiment (see FIG. 3B), the tip of the first ear portion 14b faces upward, but in FIG. 10A, the tip of the first ear portion 14b is not upward but embossed 12 or downward (first ear portion). It is suitable for 14b). Therefore, even if the external wiring 24 (not shown, see FIGS. 5A and 5B) arranged above the first ear portion 14b collides with the first ear portion 14b, the insulating coating of the external wiring 24 is the first. It is unlikely that the selvage portion 14b will damage the external wiring 24 and the first ear portion 14b will be short-circuited.

Alternatively, the first ear portion 14b may be folded in half at substantially the center in the width direction, as in the cell 10d shown in FIG. 10B. The portions of the first ear portions 14b on both sides with respect to the bent portion are substantially parallel to each other and are in contact with or close to each other. This example is advantageous for lowering the bending height H1 of the first ear portion 14b. Therefore, even if the height of the emboss 12 is low, the possibility that the external wiring 24 collides with the first ear portion 14b is low. Further, since the tip of the first ear portion 14b faces the embossing 12, even if the external wiring 24 collides with the first ear portion 14b as in FIG. 10A, the insulating coating of the external wiring 24 is the first ear. It is unlikely that the portion 14b will be damaged or that the external wiring 24 and the first ear portion 14b will be short-circuited. Further, even if the external wiring 24 collides with the first ear portion 14b, it is unlikely that the first ear portion 14b will be deformed and the laminate sheet 13 constituting the first ear portion 14b will be damaged.

Like the cell 10e shown in FIG. 10C, the first ear portion 14b folded in half as shown in FIG. 10B may be bent so as to stand up substantially at a right angle to the terrace portion 14a. This example is advantageous for reducing the width of the cell 10e (the dimension of the cell 10e along the longitudinal direction of the terrace portion 14a). Further, since the tip of the first ear portion 14b faces downward (first ear portion 14b), even if the external wiring 24 collides with the first ear portion 14b, as in FIG. 10A, the external wiring 24 It is unlikely that the insulating coating will be damaged by the first ear portion 14b, or that the external wiring 24 and the first ear portion 14b will be short-circuited.

The method of bending the first selvage portion 14b of FIGS. 10A to 10C may be applied to both embossed cells 10b (see FIGS. 6A, 6B, 9A, 9B).

The method of bending the second ear portion 14c is also not limited to the first and second embodiments. However, from the viewpoint of reducing the width of the cell, it is preferable that the second ear portion 14c is bent at the outer edge of the embossing 12 at a substantially right angle to the terrace portion 14a as in the first and second embodiments.

In the first and second embodiments, of the two ears 14b and 14c, the ears 14b close to the negative electrode tab 11n are referred to as "first ears", and the external wiring 24 is derived from the side of the first ears 14b. However, the external wiring 24 may be derived from any side of the ears 14b and 14c. The arrangement of the positive electrode tab 11p and the negative electrode tab 11n may be opposite to those of the above-described first and second embodiments. The "first ear portion" of the present invention is the ear portion (14a or 14b) on which the external wiring 24 is derived. In the present invention, the selvage portion on the side from which the external wiring 24 is led out is bent so that the bending height is relatively low. A cell in which the widths W1 and W2 of the selvage before being bent satisfy W1 = W2 constitutes the battery of the present invention only by changing the way of bending the selvage according to the side from which the external wiring 24 is led out. Can be done.

The cells 10a and 10b of the first and second embodiments are three-sided seal type cells in which one laminated sheet 13 is folded in half with a power generation element sandwiched between them and sealed with sealing areas 14a, 14b and 14c along the three sides. However, the present invention is not limited to this. For example, the cell of the present invention may be a four-sided seal type cell in which a power generation element is sandwiched between two laminated sheets 13 and sealed with a seal region along four sides.

The arrangement of the mounting components (protection circuit component 22, sealing portion 24b), positive electrode input terminal 21p, negative electrode input terminal 21n, etc. on the circuit board 20 can be arbitrarily changed. There is no limit to the number of protection circuit components 22. Parts other than these may be provided on the circuit board 20.

The connection path between the positive electrode tab 11p and the negative electrode tab 11n of the cell and the circuit board 20 is not limited to the above-described first and second embodiments. For example, the positive electrode tab 11p and the first lead 27a of the breaker 27 may be connected via another conductive tab. The breaker 27 may be provided between the negative electrode tab 11n and the negative electrode input terminal 21n.

The arrangement of the breaker 27 can be changed arbitrarily. For example, the breaker 27 may be provided on the circuit board 20 (preferably the same surface on which the protection circuit component 22 of the circuit board 20 is mounted). Alternatively, the breaker 27 may be provided on the surface of the terrace portion 14a opposite to the circuit board 20.

The positions, numbers, sizes, etc. of the cushion materials 26a and 26b are not limited to the first and second embodiments, and can be arbitrarily set. In the present invention, the cushion material can be omitted.

The field of application of the present invention is not limited, but can be widely used as a battery built in a portable electronic device that requires a high volumetric energy density. For example, it can be preferably used as a small and large-capacity battery built in an electronic device such as a mobile phone, a smartphone, a tablet terminal, a notebook computer, an electronic dictionary, an electronic book, or a portable game machine.

1,2 Laminated batteries 10a, 10b, 10c, 10d, 10e Laminated cell 11p Positive electrode tab 11n Negative electrode tabs 12, 12a, 12b Embossed 13 Laminated sheet 14a Terrace (seal area)
14b First ear (seal area)
14c Second ear (seal area)
20 Circuit board 22 Protective circuit component 24 External wiring 26a, 26b Cushion material 27 Breaker

Claims (9)

It is a laminated battery including a laminated cell having a substantially rectangular plan-view shape in which a power generation element is covered with a flexible laminated sheet, and a circuit board on which protection circuit components are mounted and external wiring is connected. hand,
The laminate cell comprises a seal region in which the laminate sheets are laminated and sealed, and an embossing corresponding to the power generation element, which protrudes to at least one side with respect to the seal region.
The seal region is connected to a terrace portion along the side from which the positive electrode tab and the negative electrode tab connected to the power generation element are derived, and is connected to both ends of the terrace portion and is perpendicular to the side along which the terrace portion is along. Includes the first and second ears along the direction
The first ear portion and the second ear portion are bent to the side where the embossing protrudes.
The unfolded width of the first ear is equal to or greater than the unfolded width of the second selvage.
The height of the folded first ear is lower than the height of the bent second ear.
The circuit board is arranged on the same side as the side where the first ear portion is bent with respect to the terrace portion, facing the terrace portion.
A laminated battery characterized in that the external wiring is led out from the side of the first ear portion in parallel with the longitudinal direction of the terrace portion. The laminated battery according to claim 1, wherein the first ear portion has a curved portion in an arc shape when viewed along the longitudinal direction of the first ear portion. The laminated battery according to claim 1, wherein the first ear portion is folded in half. The laminated battery according to claim 1, wherein the first ear portion is bent at a position away from the outer edge of the embossing. The laminated battery according to claim 1, wherein the tip of the first ear portion faces the embossing or the first ear portion. The laminated battery according to any one of claims 1 to 5, wherein the surface of the circuit board to which the external wiring is connected faces the terrace portion. The laminated battery according to any one of claims 1 to 6, wherein a cushioning material that can be compressed and deformed is provided between the circuit board and the terrace portion. The laminated battery according to any one of claims 1 to 7, wherein the embossing protrudes only on one side with respect to the sealing region. The embossing includes a first embossing projecting to one side with respect to the sealing area and a second embossing projecting to the other side with respect to the sealing area.
The first ear portion is bent to the side where the first embossing protrudes.
The laminated battery according to any one of claims 1 to 7, wherein the second ear portion is bent toward the side where the first emboss or the second emboss protrudes.