JP7033459B2 - Laminated battery - Google Patents

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 a circuit board.

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 is obtained by covering a thin plate-shaped power generation element with a flexible laminated sheet. Sub-batteries (hereinafter referred to as "laminate cells") are often used. A circuit board on which a protection circuit component (safety circuit component) for protecting the laminated cell from over-discharge 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 a laminated sheet is laminated and sealed. The sealing area is along three or four sides of a substantially rectangular laminated cell. 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 areas, the seal area 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 so that the surface on which the protection circuit component is mounted faces the terrace portion and faces the terrace portion (see, for example, Patent Document 1). ).

Japanese Unexamined Patent Publication No. 2006-114475

In the above-mentioned laminated battery, in order to make the circuit board face the terrace portion, the positive electrode tab and the negative electrode tab derived from the terrace portion or another tab connecting these and the circuit board is bent. That is, in the manufacturing process of the laminated battery, it is necessary to press the circuit board toward the terrace portion against the elastic rebound force of the tab. At this time, if an excessive pressing force is applied to the circuit board, the circuit board or the protection circuit component mounted on the circuit board collides with another electronic component (for example, a breaker) provided on the terrace portion or the terrace portion. As a result, the circuit board and electronic parts such as protection circuit parts existing between the circuit board and the terrace portion may be damaged, or the laminated sheet constituting the terrace portion may be damaged.

An object of the present invention is to solve the above-mentioned problems of the conventional laminated battery, and to provide a small laminated battery capable of preventing damage to electronic parts such as circuit boards and protection circuit parts, and further to the laminated sheet. To provide.

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 a protective circuit component is mounted. The laminated cell comprises a sealing area on which the laminated sheets are laminated and sealed. The seal area includes 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. The circuit board is arranged so that the surface on which the protection circuit component is mounted faces the terrace portion and faces the terrace portion. A cushioning material that can be compressed and deformed is provided between the circuit board and the terrace portion.

According to the present invention, the cushion material suppresses the movement of the circuit board toward the terrace portion. Therefore, it is possible to prevent the circuit board, the electronic components existing between the circuit board and the terrace portion, and the laminated sheet constituting the terrace portion from being damaged.

Since the circuit board is arranged facing the terrace portion, it is possible to reduce the size of the laminated battery.

FIG. 1 is an exploded perspective view of the laminated battery according to the first embodiment of the present invention. FIG. 2A is a perspective view of a laminated cell constituting the laminated battery according to the first embodiment of the present invention. FIG. 2B is a perspective view showing a state in which the sealing region along the two opposite sides of the laminated cell of FIG. 2A is bent. FIG. 3 is a perspective view showing a process of manufacturing the laminated battery according to the first embodiment of the present invention. FIG. 4A is a perspective view of the laminated battery according to the first embodiment of the present invention. FIG. 4B is a cross-sectional view taken along the line including line 4B-4B of FIG. 4A. FIG. 5 is a perspective view of the laminated battery according to the first embodiment of the present invention covered with an exterior sheet. FIG. 6 is a cross-sectional view of a laminated battery according to a comparative example. FIG. 7A is a perspective view of the laminated battery according to the second embodiment of the present invention. FIG. 7B is a cross-sectional view taken along the line including line 7B-7B of FIG. 7A. FIG. 8A is a perspective view of the laminated battery according to the third 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 another laminated battery according to the third embodiment of the present invention. 9B is a side view of the laminated battery as seen along the arrow 9B of FIG. 9A. FIG. 10A is a perspective view of a laminated cell constituting the laminated battery according to the fourth and fifth embodiments of the present invention. 10B is a side view of the laminated cell according to the fourth and fifth embodiments of the present invention as viewed along the arrow 10B of FIG. 10A. FIG. 11A is a perspective view showing a state in which a seal region (ear portion) along two opposing sides of a laminated cell constituting the laminated battery according to the fourth embodiment of the present invention is bent. FIG. 11B is a side view of the laminated cell according to the fourth embodiment of the present invention as seen along the arrow 11B of FIG. 11A. FIG. 12A is a perspective view of the laminated battery according to the fourth embodiment of the present invention. 12B is a side view of the laminated battery as seen along the arrow 12B of FIG. 12A. FIG. 13A is a perspective view showing a state in which a seal region (ear portion) along two opposing sides of a laminated cell constituting the laminated battery according to the fifth embodiment of the present invention is bent. FIG. 13B is a side view of the laminated cell according to the fifth embodiment of the present invention as seen along the arrow 13B of FIG. 13A. FIG. 14A is a perspective view of the laminated battery according to the fifth embodiment of the present invention. 14B is a side view of the laminated battery as seen along the arrow 14B of FIG. 14A.

In the above-mentioned laminated battery of the present invention, double-sided adhesive tape or an adhesive may be applied to both sides of the cushion material so that the circuit board and the terrace portion are connected via the cushion material. .. According to this aspect, once the circuit board is arranged facing the terrace portion via the cushion material in the manufacturing process of the laminated battery, the circuit board is prevented from being separated from the terrace portion thereafter. This facilitates the manufacture of laminated batteries.

A breaker that cuts off the current at the time of abnormal overheating may be provided on the surface of the terrace portion facing the circuit board or the surface of the circuit board on which the protection circuit component is mounted. In this case, the cushion material may be arranged so as not to face the breaker. Such an embodiment is advantageous for improving the reliability of the operation of the breaker because the possibility that an external force is applied to the breaker is reduced.

The cushion material may be compressed and deformed in a direction in which the circuit board and the terrace portion face each other. In such an embodiment, even when the distance between the circuit board and the terrace portion is narrow, the circuit board, the electronic components existing between the circuit board and the terrace portion, and the laminated sheet constituting the terrace portion are damaged. It can be reliably prevented.

The above-mentioned laminated battery of the present invention may further include external wiring connected to a surface of the circuit board facing the terrace portion. In this case, the external wiring may be led out in parallel with the longitudinal direction of the terrace portion. By setting the lead-out direction of the external wiring according to the configuration of the device in which the laminated battery is incorporated, the device can be miniaturized.

In the above, the cushion material may be arranged so as to press the external wiring toward the circuit board. Such an embodiment is advantageous in preventing the external wiring from colliding with the seal portion (ear portion) extending perpendicularly to the terrace portion.

The laminated cell may be provided with embossing protruding to one side with respect to the terrace portion corresponding to the power generation element. The seal region may include a first selvage and a second selvage connected to both ends of the terrace and along a direction perpendicular to the side along which the terrace is along. The first ear portion and the second ear portion may be bent at a substantially right angle to the same side as the embossing. The circuit board may be arranged on the same side as the side of the terrace where the embossing protrudes. According to such an embodiment, the laminated battery of the present invention can be configured by using a single embossed laminated cell.

Alternatively, the laminated cell has a first embossing that protrudes to one side with respect to the terrace portion corresponding to the power generation element and a first embossing that protrudes to the other side with respect to the terrace portion corresponding to the power generation element. It may be provided with a second emboss. The seal region may include a first selvage and a second selvage connected to both ends of the terrace and along a direction perpendicular to the side along which the terrace is along. The first ear portion may be bent at a substantially right angle to the same side as the first emboss or the second emboss. The second ear portion may be bent at a substantially right angle to the same side as the first emboss or the second emboss. The circuit board may be arranged on the same side as the side on which the first embossing of the terrace portion protrudes. According to such an embodiment, the laminated battery of the present invention can be configured 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 given in the drawings of the preceding embodiments. be. 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 a “cell”) 10, a circuit board 20, and a breaker 27.

FIG. 2A is a perspective view of the cell 10. The cell 10 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. In the cell 10, a thin plate-shaped power generation element (not shown) having a substantially rectangular plan-view shape is enclosed together with an electrolytic solution in an exterior made of a laminated sheet 13. The power generation elements are a positive electrode formed by applying a positive electrode mixture layer containing a positive electrode active material on both sides of a predetermined area of a positive electrode current collector, and a negative electrode mixture layer containing a negative electrode active material on both sides of a predetermined area of a negative electrode current collector. The negative electrode formed by coating is an electrode laminate formed by alternately laminating via a separator. The type of battery is not particularly limited, but a secondary battery, particularly a lithium ion secondary 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 heat-sealing resin layer (for example, a modified polyolefin layer) is laminated on the 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, 14c on which the laminated sheet 13 is sealed are along three sides of a substantially rectangular cell 10. The sealing 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 sealing regions 14a, 14b, 14c. A cell in which the embossing 12 protrudes only on one side with respect to the sealing region 14a, 14b, 14c, such as the cell 10, is generally "one-sided embossed type" or "one-sided embossing type" or "one-sided embossing type" or "one-sided embossing type" or "one-sided embossing type". It is called "single aperture type". In the present invention, for convenience of explanation, in the single embossed cell 10, the surface on the side where the emboss 12 protrudes is referred to as the "front surface" of the cell 10, and the surface on the opposite side is referred to as the "back surface" of the cell 10. Called. Further, the direction connecting the front surface and the back surface is called the "thickness 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 and are orthogonal to the longitudinal direction of the seal region 14a (that is, a direction parallel to the pair of seal regions 14b and 14c connected to both ends of the seal region 14a). It extends along. 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 selvages 14b and 14c extend along the sides perpendicular to the sides of the cell 10 along which the terraces 14a run. In order to reduce the outer dimensions of the cell 10, the selvages 14b and 14c are bent toward the embossing 12 at a substantially right angle to the terrace 14a, as shown in FIG. 2B. The folded selvage portions 14b and 14c are fixed to the side surface of the embossed 12 by using a double-sided adhesive tape or the like. The terrace portion 14a is surrounded in three directions by the embossing 12 and the selvage portions 14b and 14c.

Returning to FIG. 1, the circuit board 20 is an elongated thin plate-like object, and has substantially the same longitudinal dimension as the terrace portion 14a. A protection circuit component (safety circuit component) 22 composed of electronic components such as FET elements is mounted on the lower surface of the circuit board 20 (not visible in FIG. 1), and a charging circuit may be arbitrarily 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 (both of which are not visible in FIG. 1, see FIG. 4B described later) are provided on the lower surface of the circuit board 20. The external wiring 24 is connected to a terminal (not visible in FIG. 1) provided on the lower surface of the circuit board 20. The external wiring 24 extends substantially at right angles to the longitudinal direction of the circuit board 20 (or terrace portion 14a). A connector 24a is provided at the tip of the external wiring 24. The battery 1 can be charged and discharged via the external wiring 24. The external wiring 24 is composed of a plurality of flexible cables (five in the first embodiment). 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 10, 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 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 to each other. 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 10 is connected to the first lead 27a. The second lead 27b is connected to the positive electrode input terminal 21p provided on the lower 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 10 is connected to the negative electrode input terminal 21n provided on the lower surface of the circuit board 20.

The cushion material 25 is attached to the lower surface of the circuit board 20. The cushion material 25 has a substantially rectangular parallelepiped shape and is made of an elastic body that can be compressed and deformed. The cushion material 25 is not limited, but a material such as a foam material or a sponge that is easily deformed when an external force is applied and is restored to its initial shape when the external force is removed can be used. The cushion material 25 preferably has an insulating property. The cushion material 25 may be, for example, urethane foam or polyethylene sponge, and as an example, "PORON (registered commerce)" manufactured by Roger Suinoac Co., Ltd. can be exemplified.

FIG. 3 shows one process of manufacturing the battery 1. The positive electrode tab 11p is bent in a substantially "U" shape, and the breaker 27 is superposed on the surface of the terrace portion 14a on the same side as the embossed 12 projecting side. The method of fixing the breaker 27 to the terrace portion 14a is not limited, and for example, double-sided adhesive tape or an adhesive can be used. The negative electrode tab 11n and the conductive tab 28 extend parallel to each other between the cell 10 and the circuit board 20. The cushion material 25 is attached to the lower surface of the circuit board 20.

From the state of FIG. 3, the circuit board 20 is opposed to the terrace portion 14a so that the surface on which the protection circuit component 22 of the circuit board 20 is mounted faces the terrace portion 14a. The negative electrode tab 11n and the conductive tab 28 are each bent in opposite directions at two points so as to form a substantially "Z" shape when viewed along the longitudinal direction of the terrace portion 14a.

FIG. 4A is a perspective view of the battery 1 in which the circuit board 20 is superposed on the terrace portion 14a. The outer surface of the circuit board 20 (the surface opposite to the surface on which the protection circuit component 22 is mounted) is at substantially the same height as the top surface of the emboss 12 of the cell 10. The battery body 1a including the cell 10 and the circuit board 20 is covered with exterior sheets 31 and 32 (see FIG. 1) as needed (see FIG. 5). The exterior sheets 31 and 32 are not limited, but are made of, for example, an insulating resin or paper.

FIG. 4B is an arrow-view end view of the battery 1 along a surface (a surface crossing the external wiring 24) including the 4B-4B line of FIG. 4A. The circuit board 20 and the terrace portion 14a are separated from each other in the thickness direction and face each other. A protection circuit component 22 and a sealing portion 24b are provided on the surface of the circuit board 20 facing the terrace portion 14a. The sealing portion 24b is made of a known glue, a resin having an insulating property, or an adhesive, and seals and insulates the electrical connection portion between the external wiring 24 and the circuit board 20. A breaker 27 is provided on the surface of the terrace portion 14a facing the circuit board 20. The negative electrode tab 11n and the conductive tab 28 are bent between the circuit board 20 and the terrace portion 14a. The cushion material 25 is interposed between the circuit board 20 and the terrace portion 14a. More specifically, the cushion material 25 is located between the protection circuit component 22 provided on the circuit board 20 and the sealing portion 24b and the terrace portion 14a. Double-sided adhesive tape or adhesive is applied to the upper and lower surfaces of the cushion material 25. Therefore, the circuit board 20 and the terrace portion 14a are connected to each other via the cushion material 25. In the longitudinal direction of the circuit board 20, the cushion material 25 is located between the negative electrode tab 11n and the conductive tab 28.

The operation of the cushion material 25 will be described.

FIG. 6 is a cross-sectional view showing the laminated battery 101 according to the comparative example in the same manner as in FIG. 4B. The comparative example of FIG. 6 differs from the first embodiment of FIG. 4B only in that the cushion material 25 is not provided. Similar to the first embodiment, it is necessary to bend the negative electrode tab 11n and the conductive tab 28 so that the outer surface of the circuit board 20 is substantially the same height as the top surface of the embossed 12 of the cell 10. Therefore, as shown in FIG. 6, it is necessary to apply a force F toward the terrace portion 14a to the circuit board 20 against the elastic rebound force of the negative electrode tab 11n and the conductive tab 28. If the force F is excessive, the circuit board 20 moves toward the terrace portion 14a more than necessary, and the circuit board 20 and the mounting components mounted on the circuit board 20 (protection circuit component 22, sealing portion 24b, etc.) Collides with the breaker 27 provided on the terrace portion 14a and the laminated sheet constituting the terrace portion 14a. As a result, the circuit board 20, the mounting component, and the breaker 27 may be damaged (for example, cracks or cracks may occur), or the laminated sheet constituting the terrace portion 14a may be damaged. Damage to the laminated sheet can cause leakage of the electrolytic solution due to tearing of the laminated sheet, intrusion of moisture into the cell 10, and a short circuit in the cell 10. The excessive force F may be applied not only when bending the negative electrode tab 11n and the conductive tab 28, but also when handling the battery 101 in the subsequent manufacturing process of the battery 101.

On the other hand, in the present embodiment, as shown in FIG. 4B, the cushion material 25 is provided between the circuit board 20 and the terrace portion 14a. When an excessive force F is applied to the circuit board 20, the cushion material 25 opposes the force F, so that the circuit board 20 is prevented from moving toward the terrace portion 14a more than necessary. The circuit board 20 and mounting components (protection circuit component 22, sealing portion 24b, etc.) do not collide with the breaker 27 provided on the terrace portion 14a or the laminated sheet constituting the terrace portion 14a. Therefore, it is possible to prevent the circuit board 20, the mounting parts existing between the circuit board 20 and the terrace portion 14a, and the electronic parts such as the breaker 27 from being damaged, and the laminated sheet constituting the terrace portion 14a from being damaged. can do.

Since double-sided adhesive tape or adhesive is applied to the upper and lower surfaces of the cushion material 25, once the circuit board 20 is superposed on the terrace portion 14a via the cushion material 25 as shown in FIG. 4A, the cushion material 25 is attached. The circuit board 20 and the terrace portion 14a are connected to each other via the circuit board 20 and the terrace portion 14a. The cushion material 25 opposes 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 prevents 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, attachment of the exterior sheets 31 and 32) is improved, and the manufacturing of the battery 1 becomes easy.

The circuit board 20 is arranged so as to face the terrace portion 14a between the selvage portions 14b and 14c bent along the thickness direction. Therefore, the circuit board 20 is prevented from protruding greatly in the horizontal direction from the cell 10. The battery 1 of the first embodiment is miniaturized and has excellent volumetric energy density.

In the first embodiment, as shown in FIG. 4B, the cushion material 25 is arranged so as not to face the breaker 27. Therefore, even if an excessive force F is applied, the cushion material 25, the circuit board 20, and the mounting components of the circuit board 20 do not come into contact with the breaker 27. Since it is possible to prevent an external force from being applied to the breaker 27, the reliability of the operation of the breaker 27 is improved.

(Embodiment 2)
FIG. 7A is a perspective view of the laminated battery 2 according to the second embodiment of the present invention. FIG. 7B is a cross-sectional view of the battery 2 along the plane including the line 7B-7B of FIG. 7A.

As shown in FIG. 7B, in the second embodiment, the arrangement of various members arranged between the circuit board 20 and the terrace portion 14a is different from that of the first embodiment. In the second embodiment, the protection circuit component 22 mounted on the circuit board 20 and the breaker 27 superposed on the terrace portion 14a face each other in the thickness direction. Further, in the second embodiment, the embossing 12 is thinner than that of the first embodiment, and the distance between the circuit board 20 and the terrace portion 14a is narrow so as to correspond to the embossing 12. Therefore, even if the circuit board 20 moves slightly toward the terrace portion 14a due to the force F being applied, there is a high possibility that the protection circuit component 22 will collide with the breaker 27.

Therefore, in the second embodiment, the cushion material 25 having a thickness larger than the gap between the circuit board 20 and the terrace portion 14a in a natural state is used. In the state of FIG. 7B in which the outer surface of the circuit board 20 (the surface opposite to the surface on which the protection circuit component 22 is mounted) is substantially the same height as the top surface of the emboss 12 of the cell 10, the cushion material 25 is thick. It is greatly compressed and deformed in the vertical direction. Since the repulsive force in the thickness direction of the cushion material 25 is large, it is possible to counter a larger force F. Therefore, even when the distance between the circuit board 20 and the terrace portion 14a is narrow, or when the mounting component of the circuit board 20 and the breaker 27 face each other in the thickness direction, the circuit board 20 and the mounting component (Protection circuit component 22, sealing portion 24b, etc.) does not collide with the breaker 27 provided on the terrace portion 14a or the laminated sheet constituting the terrace portion 14a. Therefore, it is certain that the circuit board 20, the mounting parts existing between the circuit board 20 and the terrace portion 14a, and the electronic parts such as the breaker 27 are damaged, and the laminated sheet constituting the terrace portion 14a is damaged. Can be prevented.

Similar to the first embodiment, the cushion material 25 is arranged so as not to face the breaker 27. Therefore, the compression-deformed cushion material 25 does not apply an external force to the breaker 27. This is advantageous for improving the reliability of the operation of the breaker 27.

In the second embodiment, the longitudinal dimension of the circuit board 20 is shorter than the longitudinal dimension of the terrace portion 14a. As shown in FIG. 7B, the cushion material 25 is bent in order to arrange the cushion material 25 in a limited area where the circuit board 20 and the terrace portion 14a face each other so as to counter the force F. It is arranged so as to be sandwiched between the negative electrode tabs 11n. However, in the second embodiment, this is not essential, and the cushion material 25 may be arranged at a position where the tabs 11p and 11n do not come into contact with each other, as in the first embodiment. In the present invention, the longitudinal dimension of the circuit board 20 is arbitrary, and preferably the circuit board 20 is set so as not to protrude along the horizontal direction from the selvages 14b and 14c.

The second embodiment is the same as the first embodiment except for the above. The description of the first embodiment is appropriately applied to the second embodiment.

(Embodiment 3)
FIG. 8A is a perspective view of the laminated battery 3 according to the third embodiment of the present invention. FIG. 8B is a side view of the battery 3 as viewed along the arrow 8B of FIG. 8A.

As shown in FIG. 8A, in the third embodiment, the external wiring 24 is the end of one side (first ear portion 14b side) in the longitudinal direction of the circuit board 20 having an elongated rectangular shape in a plan view. It is connected in the vicinity and is led out from the side of the first selvage portion 14b in parallel with the longitudinal direction of the circuit board 20 (or the terrace portion 14a). As shown in FIG. 8B, as in the first embodiment, the external wiring 24 is connected to the circuit board 20 by a sealing portion 24b provided on the surface of the circuit board 20 facing the terrace portion 14a. ing. In the third embodiment, since the embossing 12 is relatively thick, the bent selvage portion 14b and the circuit board 20 are separated from each other in the thickness direction. Therefore, the external wiring 24 can be led out from the circuit board 20 beyond the selvage portion 14b along the horizontal direction without colliding with the selvage portion 14b.

Cushion materials 25a and 25b are provided between the circuit board 20 and the terrace portion 14a. Therefore, as in the first embodiment, even if a force toward the terrace portion 14a is applied to the circuit board 20, the circuit board 20 and the mounting components (protection circuit component 22, sealing portion 24b, etc.) are still present in the terrace portion 14a. It does not collide with the breaker 27 provided in the above and the laminated sheet constituting the terrace portion 14a. Therefore, it is possible to prevent the circuit board 20, the mounting parts existing between the circuit board 20 and the terrace portion 14a, and the electronic parts such as the breaker 27 from being damaged, and the laminated sheet constituting the terrace portion 14a from being damaged. can do.

In the third embodiment, two cushioning materials 25a and 25b are provided between the circuit board 20 and the terrace portion 14a. The first cushion material 25a is arranged in the vicinity of the second selvage portion 14c, and the second cushion material 25b is provided in the vicinity of the first selvage portion 14b. The second cushion material 25b presses the external wiring 24 toward the circuit board 20 so that the external wiring 24 does not hang down toward the terrace portion 14a. Therefore, the external wiring 24 is prevented from hanging down and colliding with the upper end of the selvage portion 14b. When the external wiring 24 collides with the selvage portion 14b, the selvage portion 14b may be deformed and the laminated sheet constituting the selvage portion 14b may be damaged. Damage to the laminated sheet can cause leakage of the electrolytic solution due to tearing of the laminated sheet and short circuit in the cell 10. The second cushion material 25b is advantageous in preventing such a situation from occurring.

Similar to the first and second embodiments, the cushion materials 25a and 25b are arranged so as not to face the breaker 27. Therefore, the compression-deformed cushion materials 25a and 25b do not apply an external force to the breaker 27. This is advantageous for improving the reliability of the operation of the breaker 27.

In the battery 3, one of the two cushion materials 25a and 25b may be omitted.

FIG. 9A is a perspective view of another laminated battery 3a according to the third embodiment of the present invention. 9B is a side view of the battery 3a as seen along the arrow 9B of FIG. 9A. The battery 3a is shown in FIGS. 8A and 8B in that a single cushioning material 25 is disposed between the circuit board 20 and the terrace portion 14a over almost the entire longitudinal region of the circuit board 20. Different from battery 3. Since the cushion material 25 is arranged over almost the entire region where the circuit board 20 and the terrace portion 14a face each other, even if a force toward the terrace portion 14a is applied to the circuit board 20, the circuit board 20 and the mounting components (Protection circuit component 22, sealing portion 24b, etc.) does not collide with the breaker 27 provided on the terrace portion 14a or the laminated sheet constituting the terrace portion 14a. Therefore, the circuit board 20, the mounting parts existing between the circuit board 20 and the terrace portion 14a, and the electronic parts such as the breaker 27 are damaged, and the laminated sheet constituting the terrace portion 14a is damaged. It can be reliably prevented.

In the battery 3a, the cushion material 25 is also arranged on the breaker 27. However, since the cushion material 25 faces the terrace portion 14a over a wide area, the external force received by the breaker 27 from the cushion material 25 is relatively small.

A configuration in which the cushion material 25 is arranged over almost the entire region where the circuit board 20 and the terrace portion 14a face each other, such as the battery 3a, may be applied to the first and second embodiments.

The third embodiment is the same as the first embodiment except for the above. The description of the first embodiment is appropriately applied to the third embodiment.

(Embodiment 4)
FIG. 10A is a perspective view of a laminated cell (hereinafter, simply referred to as “cell”) 10b constituting the laminated battery 4 (see FIGS. 12A and 12B described later) according to the fourth embodiment of the present invention. 10B is a side view of the cell 10b as seen along the arrow 10B of FIG. 10A. In the cell 10b of the fourth embodiment, substantially rectangular embossed 12a, 12b corresponding to the power generation element project to both sides in the thickness direction with respect to the sealing regions 14a, 14b, 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. May be. A cell in which embossing 12a, 12b protrudes on both sides with respect to the sealing region 14a, 14b, 14c, such as the cell 10b, is generally "both embossed type" or "both embossed type" focusing on the molding shape of the laminated sheet 13. It is called "aperture type". The direction connecting the first embossing 12a and the second embossing 12b is referred to as a "thickness direction" or a "height direction".

As shown in FIGS. 11A and 11B, in order to reduce the outer dimension of the cell 10b, the selvages 14b and 14c are substantially on the same side as the first embossing 12a with respect to the terrace portion 14a, as in the first embodiment. Can be folded at a right angle. The folded selvage portions 14b and 14c are fixed to the side surface of the first embossing 12a by using a double-sided adhesive tape or the like. The terrace portion 14a is surrounded in three directions by the first embossing 12a and the selvage portions 14b and 14c.

FIG. 12A is a perspective view seen from the first embossed 12a side of the laminated battery (hereinafter, simply referred to as “battery”) 4. 12B is a side view of the battery 4 as viewed along the arrow 12B of FIG. 12A. 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. The circuit board 20 faces the surface of the terrace portion 14a on the same side as the side on which the first emboss 12a protrudes. The external wiring 24 is connected in the vicinity of one end of the circuit board 20 in the longitudinal direction (first selvage portion 14b side), and from the side of the first selvage portion 14b, the terrace portion 14a (or the circuit board 20). It is derived parallel to the longitudinal direction.

The battery 4 of the present embodiment 4 uses the battery 3 of the third embodiment (FIG. 8A, FIG. 8B) is the same. The description of the third embodiment is appropriately applied to the fourth embodiment.

In the cell 10b of the present embodiment 4, the selvage portions 14b and 14c may be bent to the same side as the second embossing 12b at a substantially right angle to the terrace portion 14a. The circuit board 20 and the breaker 27 are arranged on the first embossed 12a side with respect to the terrace portion 14a, as in FIGS. 12A and 12B. Since the selvage portion 14b and the external wiring 24 are arranged on opposite sides to the terrace portion 14a, it is possible to avoid a collision between the selvage portion 14b and the selvage portion 14b. Therefore, the possibility that the selvage portion 14b is damaged due to the collision of the external wiring 24 and the possibility that the selvage portion 14b is short-circuited with the external wiring 24 is reduced. This is advantageous for improving the safety of the battery.

Both embossed cells 10b shown in the fourth embodiment may be applied to the batteries 1 and 2 of the first and second embodiments.

(Embodiment 5)
FIG. 13A is a perspective view of a laminated cell (hereinafter, simply referred to as “cell”) 10c constituting the laminated battery 5 (see FIGS. 14A and 14B described later) according to the fifth embodiment of the present invention. 13B is a side view of the cell 10c as seen along the arrow 13B of FIG. 13A. The cell 10c is both embossed cells (see FIGS. 10A and 10B) like the cell 10b of the fourth embodiment. However, unlike the fourth embodiment, in the fifth embodiment, the first selvage portion 14b is bent to the same side as the second embossed portion 12b at a substantially right angle to the terrace portion 14a, and the second selvage portion 14c is the first. It is bent at a substantially right angle to the terrace portion 14a on the same side as the embossed 12a. The folded first and second ear portions 14b and 14c are fixed to the side surfaces of the second and first embossed 12b and 12a by using double-sided adhesive tape or the like, respectively. The terrace portion 14a is surrounded in two directions by the first embossing 12a and the second ear portion 14c, and the two directions are surrounded by the second embossing 12b and the first selvage portion 14b.

FIG. 14A is a perspective view seen from the first embossed 12a side of the laminated battery (hereinafter, simply referred to as “battery”) 5. 14B is a side view of the battery 5 as viewed along the arrow 14B of FIG. 14A. Similar to the battery 4 of the fourth embodiment, 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. The circuit board 20 faces the surface of the terrace portion 14a on the same side as the side on which the first emboss 12a protrudes. The external wiring 24 is connected in the vicinity of one end of the circuit board 20 in the longitudinal direction (first selvage portion 14b side), and from the side of the first selvage portion 14b, the terrace portion 14a (or the circuit board 20). It is derived parallel to the longitudinal direction.

In the batteries 3, 3a, 4 of the third and fourth embodiments, the first ear portion 14b and the external wiring 24 are both arranged on the same side with respect to the terrace portion 14a. Therefore, the external wiring 24 may collide with the first ear portion 14b. In particular, in the battery 4 using both embossed cells 10b, the protruding height of the first embossed 12a from the terrace portion 14a is often low, so that the circuit board 20 is higher than the top surface of the first embossed 12a. When arranged so as not to project in the direction, the possibility that the external wiring 24 collides with the first ear portion 14b increases.

In the fifth embodiment, since the first ear portion 14b and the external wiring 24 are arranged on opposite sides to the terrace portion 14a, the collision between the external wiring 24 and the first ear portion 14b is avoided. Can be done. Therefore, the possibility that the first ear portion 14b is damaged due to the collision of the external wiring 24 and the possibility that the external wiring 24 and the first ear portion 14b are short-circuited is reduced. This is advantageous for improving the safety of the battery 5.

The present embodiment 5 is the same as the fourth embodiment except for the above. The description of the fourth embodiment is appropriately applied to the fifth embodiment.

Both embossed cells 10c shown in the fifth embodiment may be applied to the batteries 1 and 2 of the first and second embodiments.

The above embodiments 1 to 5 are merely examples. The present invention is not limited to the above embodiments 1 to 5, and can be appropriately modified.

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 10 and the circuit board 20 is not limited to the above embodiments 1 to 5. 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 breaker 27 does not have to be provided on the terrace portion 14a. For example, the breaker 27 may be provided on the same surface of the circuit board 20 on which the protection circuit component 22 is mounted.

The cushion materials 25, 25a, 25b may be arranged between the circuit board 20 and the terrace portion 14a. The positions, numbers, sizes, etc. of the cushion materials 25, 25a, 25b can be arbitrarily set.

In the third and fourth embodiments, the external wiring 24 may be led out from the side of the second selvage portion 14c instead of the first selvage portion 14b along the longitudinal direction of the terrace portion 14a.

In the fifth embodiment, the external wiring 24 can be led out from the side of the second selvage portion 14c instead of the first selvage portion 14b along the longitudinal direction of the terrace portion 14a. In this case, the first ear portion 14b is bent to the same side as the first emboss 12a at a substantially right angle to the terrace portion 14a, and the second ear portion 14c is to the same side as the second emboss 12b with respect to the terrace portion 14a. It is preferable that it is bent at a substantially right angle. That is, it is preferable that the selvage portion (14a or 14b) on the side from which the external wiring 24 is derived is bent at a substantially right angle to the terrace portion 14a on the side opposite to the external wiring 24.

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.

1,2,3,3a,4,5 Laminated batteries 10,10b, 10c Laminated cell 11p Positive electrode tab 11n Negative electrode tab 12,12a, 12b Embossed 13 Laminated sheet 14a Terrace part (seal area)
14b, 14c Ear (seal area)
20 Circuit board 22 Protection circuit component 24 External wiring 25, 25a, 25b Cushion material 27 Breaker

Claims (8)

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 a protective circuit component is mounted.
The laminated cell comprises a sealing area in which the laminated sheets are laminated and sealed.
The seal area includes 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.
The circuit board is arranged so that the surface on which the protection circuit component is mounted faces the terrace portion and faces the terrace portion.
A laminated battery characterized in that a cushioning material that can be compressed and deformed is provided between the circuit board and the terrace portion. The laminated battery according to claim 1, wherein double-sided adhesive tape or an adhesive is applied to both sides of the cushion material so that the circuit board and the terrace portion are connected via the cushion material. A breaker that cuts off the current when abnormally overheated is provided on the surface of the terrace portion facing the circuit board or on the surface of the circuit board on which the protection circuit component is mounted.
The laminated battery according to claim 1 or 2, wherein the cushion material is arranged so as not to face the breaker. The laminated battery according to any one of claims 1 to 3, wherein the cushion material is compressed and deformed in a direction in which the circuit board and the terrace portion face each other. Further provided with external wiring connected to the surface of the circuit board facing the terrace portion.
The laminated battery according to any one of claims 1 to 4, wherein the external wiring is led out in parallel with the longitudinal direction of the terrace portion. The laminated battery according to claim 5, wherein the cushion material is arranged so as to press the external wiring toward the circuit board. The laminated cell has embossing that projects to one side with respect to the terrace portion corresponding to the power generation element.
The sealing area includes a first selvage and a second selvage connected to both ends of the terrace and along a direction perpendicular to the side along which the terrace is along.
The first ear portion and the second ear portion are bent at a substantially right angle to the same side as the embossing.
The laminated battery according to any one of claims 1 to 6, wherein the circuit board is arranged on the same side of the terrace portion as the side on which the embossing protrudes. The laminated cell has a first embossing corresponding to the power generation element and projecting to one side with respect to the terrace portion, and a second embossing corresponding to the power generation element and projecting to the other side with respect to the terrace portion. With embossing,
The sealing area includes a first selvage and a second selvage connected to both ends of the terrace and along a direction perpendicular to the side along which the terrace is along.
The first ear portion is bent at a substantially right angle to the same side as the first emboss or the second emboss.
The second ear portion is bent at a substantially right angle to the same side as the first emboss or the second emboss.
The laminated battery according to any one of claims 1 to 6, wherein the circuit board is arranged on the same side as the side on which the first embossing of the terrace portion protrudes.

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