CN111052438B - Laminated battery - Google Patents
Laminated battery Download PDFInfo
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- CN111052438B CN111052438B CN201880056040.4A CN201880056040A CN111052438B CN 111052438 B CN111052438 B CN 111052438B CN 201880056040 A CN201880056040 A CN 201880056040A CN 111052438 B CN111052438 B CN 111052438B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
A laminated battery (1) is provided with a laminated unit (10) having a substantially rectangular planar shape and a circuit board (20) on which a protective circuit member (22) is mounted, the power generating element being externally mounted by a laminated plate (13). The laminated unit (10) includes a terrace portion (14a) where laminated plates (13) are superposed. The circuit board (20) is disposed so that the surface on which the protective circuit component (22) is mounted faces the stage (14a) and faces the stage (14 a). A buffer material (25) that can be compressed and deformed is provided between the circuit board (20) and the terrace portion (14 a).
Description
Technical Field
The present invention relates to a laminated battery including a laminated unit and a circuit board, the laminated unit externally decorating a power generating element with a laminated plate.
Background
A nonaqueous electrolyte battery represented by a lithium ion secondary battery is characterized by high energy density, and is therefore available as a power source for portable information terminals, portable game machines, and the like. In such applications, in order to meet the contradictory requirements of size reduction and capacity increase, a laminated lithium ion rechargeable battery (hereinafter referred to as a "laminated cell") having a generally rectangular planar shape in which a thin plate-shaped power generating element is externally decorated with a flexible laminated plate is widely used. The laminated battery is configured by integrating a circuit board, on which a protective circuit member (safety circuit member) for protecting the laminated unit from over-discharge and over-charge is mounted, with the laminated unit.
The laminated unit includes a sealing region in which the laminated plates are stacked and sealed outside the power generating element. The sealing region is along three or four sides of the generally rectangular laminated unit. A positive electrode tab and a negative electrode tab connected to the power generating element are led out from one side of the laminated unit. The sealing region along the side from which the positive electrode lead and the negative electrode lead are led out in the sealing region is called a terrace portion. In order to reduce the size of the laminated battery, the circuit board is generally disposed so that the terrace portion faces the surface on which the protective circuit member is mounted, and the circuit board faces the terrace portion (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2006 and 114475
Disclosure of Invention
Problems to be solved by the invention
In the above-described laminated battery, the positive electrode tab and the negative electrode tab led out from the terrace portion, or the other tabs connecting these and the circuit board are bent so that the circuit board and the terrace portion face each other. That is, in the manufacturing process of the laminated battery, the circuit board needs to be pressed against the terrace portion against the elastic reaction force of the tab. At this time, if an excessive pushing force is applied to the circuit board, the protective circuit component mounted on the circuit board, and other electronic components (for example) provided in the stage portion collide with each other. As a result, electronic components such as a circuit board and a protective circuit member positioned between the circuit board and the terrace portion may be damaged, and the laminate board constituting the terrace portion may be damaged.
The present invention has an object to provide a small-sized laminated battery which solves the problems of the conventional laminated battery described above and can prevent damage to electronic components such as a circuit board and a protection circuit, particularly a laminated plate.
Means for solving the problems
A laminated battery of the present invention includes a laminated unit having a substantially rectangular planar shape for externally decorating a power generating element with a flexible laminated plate, and a circuit board on which a protective circuit member is mounted. The laminated unit includes a sealing region in which the laminated plates are stacked and sealed. The sealing region includes a terrace portion along the side from which the positive electrode tab and the negative electrode tab connected to the power generating element are led out. The circuit board is disposed so that a surface on which the protective circuit component is mounted faces the terrace portion and faces the terrace portion. A buffer material capable of compressive deformation is provided between the circuit board and the stage portion.
Effects of the invention
According to the present invention, the buffer material suppresses the circuit board from moving toward the stage. Therefore, the electronic component located between the circuit board and the stage and the laminated board constituting the stage can be prevented from being damaged.
Since the circuit board is disposed to face the terrace portion, the laminated battery can be downsized.
Drawings
Fig. 1 is an exploded perspective view of a laminated battery according to a first embodiment of the present invention.
Fig. 2A is a perspective view of a laminated unit constituting a laminated battery according to a first embodiment of the present invention. Fig. 2B is a perspective view showing a state in which the sealing regions along the two opposing sides of the stacked unit of fig. 2A are folded.
Fig. 3 is a perspective view of 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 of the laminated battery taken along a plane including the line 4B-4B in fig. 4A.
Fig. 5 is a perspective view of a laminated battery according to a first embodiment of the present invention covered with an exterior plate.
Fig. 6 is a cross-sectional view of a laminated battery of a comparative example.
Fig. 7A is a perspective view of a laminated battery according to a second embodiment of the present invention. Fig. 7B is a cross-sectional view of the laminated battery taken along a plane including the line 7B-7B in fig. 7A.
Fig. 8A is a perspective view of a laminated battery according to a third embodiment of the present invention. Fig. 8B is a side view of the laminated battery as viewed along arrow 8B in fig. 8A.
Fig. 9A is a perspective view of another laminated battery according to a third embodiment of the present invention. Fig. 9B is a side view of the laminated battery as viewed along arrow 9B of fig. 9A.
Fig. 10A is a perspective view of a stacked unit constituting the stacked battery according to the fourth or fifth embodiment of the present invention. Fig. 10B is a side view of the laminated unit according to the fourth and fifth embodiments of the present invention as viewed along arrow 10B of fig. 10A.
Fig. 11A is a perspective view showing a state in which the sealing regions (ear portions) along the two opposing sides of the laminated unit constituting the laminated battery according to the fourth embodiment of the present invention are bent. Fig. 11B is a side view of the laminated unit according to the fourth embodiment of the present invention as viewed along an arrow 11B in fig. 11A.
Fig. 12A is a perspective view of a laminated battery according to a fourth embodiment of the present invention. Fig. 12B is a side view of the laminated battery as viewed along arrow 12B in fig. 12A.
Fig. 13A is a perspective view showing a state in which the sealing regions (ear portions) along the two opposing sides of the laminated unit constituting the laminated battery according to the fifth embodiment of the present invention are bent. Fig. 13B is a side view of the lamination unit according to the fifth embodiment of the present invention as viewed along an arrow 13B in fig. 13A.
Fig. 14A is a perspective view of a laminated battery according to a fifth embodiment of the present invention. Fig. 14B is a side view of the laminated battery as viewed along arrow 14B of fig. 14A.
Detailed Description
In the above-described laminated battery of the present invention, a double-sided adhesive tape or an adhesive may be bonded to both sides of the cushioning material so as to connect the circuit board and the terrace portion via the cushioning material. According to this aspect, in the manufacturing process of the laminated battery, when the circuit board is disposed so as to face the terrace portion with the buffer material interposed therebetween, the circuit board is prevented from being separated from the terrace portion thereafter. Therefore, the laminated battery can be easily manufactured.
The circuit board may be provided with a circuit board mounting surface on which the protection circuit member is mounted, and a circuit breaker which shuts off a current when the protection circuit member is mounted. In this case, the cushioning material may not be disposed to face the breaker. This configuration is advantageous in that the possibility of applying an external force to the breaker is reduced, and thus the reliability of the operation of the breaker is improved.
The cushioning material may be compressively deformed in a direction in which the circuit substrate faces the terrace portion. This configuration can reliably prevent the circuit board, the electronic component positioned between the circuit board and the stage, and the laminated board constituting the stage from being damaged even when the distance between the circuit board and the stage is narrow.
The 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 in the longitudinal direction of the stage. By setting the lead-out direction of the external wiring according to the structure of the device in which the stacked battery is assembled, the device can be miniaturized.
In the above configuration, the buffer member may press the external wiring against the circuit board. This is advantageous for preventing the external wiring from colliding with the seal portion (ear portion) extending perpendicularly with respect to the terrace portion.
The lamination unit may include a projection projecting to one side with respect to the terrace portion in correspondence with the power generating element. The sealing region may include first and second ear portions connected to both ends of the platform portion and in a direction perpendicular to the side along which the platform portion is located. The first and second ear portions may be bent at substantially right angles to the same side as the projection. The circuit substrate may be disposed on the same side of the stage as the side from which the bump protrudes. According to this aspect, the laminated battery of the present invention can be configured using a single-projection type laminated cell.
Alternatively, the laminated unit may include a first protrusion protruding toward one side of the terrace portion corresponding to the power generating element, and a second protrusion protruding toward the other side of the terrace portion corresponding to the power generating element. The sealing region may include a first ear portion and a second ear portion connected to both ends of the platform portion in a direction perpendicular to the side along which the platform portion is located. The first ear portion may be bent at substantially right angles on the same side as the first projection or the second projection. The second ear portion is bent at substantially right angles on the same side as the first projection or the second projection. The circuit substrate may be disposed on the same side of the stage as the side from which the first bump protrudes. According to this aspect, the laminate type battery of the present invention can be configured using a two-projection type laminate unit.
The present invention will be described in detail below while showing suitable embodiments. However, the present invention is not limited to the following embodiments. For convenience of explanation, the drawings referred to in the following description simply show the main components constituting the embodiments of the present invention. Therefore, the present invention includes any component not shown in the following figures. In addition, the components shown in the following figures may be changed or omitted within the scope of the present invention. In the drawings referred to in each embodiment, the same reference numerals as those referred to in the drawings of the previous embodiment are given to the components corresponding to the components shown in the drawings referred to in the previous embodiment. With respect to such components, redundant description is omitted, and the description of the previous embodiments can be referred to as appropriate.
(embodiment I)
Fig. 1 is an exploded perspective view of a stacked battery (hereinafter simply referred to as "battery") 1 according to a first embodiment of the present invention. The battery 1 includes a stacked unit (hereinafter, simply referred to as a "unit") 10, a circuit board 20, and a circuit breaker 27.
Fig. 2A is a perspective view of the unit 10. The cell 10 has a substantially rectangular shape in plan view, and has a thin plate shape having a thickness smaller than the longitudinal and lateral dimensions of the substantially rectangular shape. In this cell 10, a thin plate-like power generating element (not shown) having a substantially rectangular planar shape is enclosed together with an electrolyte in an outer casing made of a laminated plate 13. The power generating element is an electrode laminate in which a positive electrode formed by coating a positive electrode mixture layer containing a positive electrode active material on both surfaces of a predetermined region of a positive electrode current collector and a negative electrode formed by coating a negative electrode mixture layer containing a negative electrode active material on both surfaces of a predetermined region of a negative electrode current collector are alternately laminated with a separator interposed therebetween. The kind of battery is not particularly limited, but among the rechargeable batteries, a lithium ion battery is preferable.
The laminated plate 13 is thinner than the power generation element and has flexibility. The laminate sheet 13 may be, for example, a flexible multilayer sheet in which a heat-fusible resin layer (for example, modified polyolefin) is laminated on a surface of a base layer made of aluminum or the like on a side facing the power generating element. One rectangular laminated plate 13 is folded in two so as to sandwich the power generating element, and is overlapped outside the power generating element and sealed by a heat sealing method or the like. The sealing areas 14a, 14b, 14c, where the laminate 13 is sealed, are along three sides of the generally rectangular cell 10. The sealing regions 14a, 14b, 14c lie along a common plane. A substantially rectangular boss 12 corresponding to the power generating element protrudes to one side with respect to the seal regions 14a, 14b, 14 c. As in the unit 10, a unit in which the projection 12 projects only to one side with respect to the seal regions 14a, 14b, 14c is generally referred to as a "single projection type", or a "sheet blocking type" in view of the shape of the laminate 13. In the present invention, for convenience of explanation, in the single-bump type unit 10, the surface on the side from which the bumps 12 protrude is referred to as the "front surface" of the unit 10, and the surface on the opposite side is referred to as the "back surface" of the unit 10. The direction connecting the front surface and the back surface is referred to as "thickness direction". A direction parallel to a plane common to the seal regions 14a, 14b, and 14c is referred to as a "horizontal direction".
The positive electrode lead 11p and the negative electrode lead 11n are led out from the sealing region 14 a. The positive electrode tab 11p and the negative electrode tab 11n have a short-side shape and extend in a direction perpendicular to the longitudinal direction of the seal region 14a (i.e., in a direction parallel to a pair of seal regions 14b and 14c connected to both ends of the seal region 14 a). The positive electrode tab 11p is formed of, for example, an aluminum thin plate, and is electrically connected to a plurality of positive electrode current collectors (not shown) constituting the power generating element. The negative electrode tab 11n is formed of, for example, a nickel thin plate, and is electrically connected to a plurality of negative electrode current collectors (not shown) constituting the power generating element.
In the present invention, the sealing region 14a from which the positive electrode tab 11p and the negative electrode tab 11n are led out is referred to as a "terrace portion". The seal regions 14b and 14c connected to both ends of the terrace portion 14a are referred to as "ear portions". The ear portions 14b, 14c extend along sides that are perpendicular relative to the sides of the unit 10 along which the platform portion 14a extends. In order to reduce the outer dimension of the unit 10, as shown in fig. 2B, the ear portions 14B, 14c are bent at substantially right angles to the platform portion 14a on the projection 12 side. The bent ear portions 14b and 14c are fixed to the side surfaces of the boss 12 using double-sided adhesive tape or the like. The platform portion 14a is surrounded in three directions by the projections 12 and the ear portions 14b, 14 c.
Returning to fig. 1, the circuit board 20 is an elongated thin plate-like object having substantially the same longitudinal dimension as the terrace portion 14 a. A protection circuit member (safety circuit member) 22 made of an electronic component such as an FET element is mounted on the lower surface (not visible in fig. 1) of the circuit board 20, and a charging circuit can be formed arbitrarily. In the present embodiment, two protection circuit members 22 are mounted, but the number of protection circuit members 22 is not limited to this, and is arbitrary. A positive input terminal 21p and a negative input terminal 21n (both not visible in fig. 1; see fig. 4B described later) are also 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 substrate 20. The external wiring 24 extends substantially at right angles to the longitudinal direction of the circuit board 20 (or the terrace portion 14 a). A connector 24a is provided at the tip of the external wiring 24. The external wiring 24 allows charging and discharging with respect to the battery 1. The external wiring 24 is constituted by a plurality of (five in the present embodiment) flexible cables. The type of the plurality of cables is not particularly limited, but may include, for example, a positive cable, a negative cable, a cable for temperature detection for detecting the temperature of the laminated unit 10, and the like. The number of cables constituting the external wiring 24 and the function of each cable are not limited to those in the present embodiment, and can be changed arbitrarily.
The breaker 27 includes a thin plate-like element main body portion that functions as a current blocking device that blocks current when abnormal overheating occurs. The first lead 27a and the second lead 27b are led out from the element main body portion in opposite directions to each other. The first lead 27a and the second lead 27b are short-side thin plates made of a conductive metal. The positive electrode tab 11p of the cell 10 is connected to the first lead 27 a. The second lead 27b is connected to the positive input terminal 21p provided on the lower surface of the circuit substrate 20 through a conductive lead plate 28. The conductive tab 28 is a short-side thin plate made of a conductive metal (e.g., nickel).
The negative electrode tab 11n of the cell 10 is connected to a negative electrode input terminal 21n provided on the lower surface of the circuit board 20.
A buffer material 25 is mounted on the lower surface of the circuit board 20. The cushioning material 25 has a substantially rectangular parallelepiped shape and is made of a compression-deformable elastic body. 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 returns to an initial shape when the external force is removed is used. The buffer material 25 preferably has an insulating property. The cushioning material 25 may be, for example, urethane foam, polyacetylene sponge, or the like. As an example, "PORON (registered trademark)" manufactured by RIC (ジャースイノアック) corporation can be exemplified.
Fig. 3 shows a process of manufacturing the battery 1. The positive electrode tab 11p is bent into a substantially U shape, and the flag 27 overlaps the surface of the terrace portion 14a on the same side as the projection side of the boss 12. The method of fixing the flag 27 to the table portion 14a is not limited, but for example, a double-sided adhesive tape or an adhesive can be used. The negative electrode lead 11n and the conductive lead 28 extend parallel to each other between the unit 10 and the circuit substrate 20. The buffer material 25 is mounted on the lower surface of the circuit board 20.
From the state of fig. 3, the surface of the circuit board 20 on which the protective circuit component 22 is mounted faces the terrace portion 14a and faces the terrace portion 14 a. The negative electrode tab 11n and the conductive tab 28 are bent in opposite directions at two positions so as to form a substantially Z-shape when viewed in the longitudinal direction of the terrace portion 14 a.
Fig. 4A is a perspective view of the battery 1 in which the circuit board 20 is superimposed on the terrace portion 14A. The outer surface of the circuit board 20 (the surface opposite to the surface on which the protective circuit member 22 is mounted) has substantially the same height as the top surface of the bump 12 of the unit 10. The battery main body 1a including the cell 10 and the circuit board 20 is covered with exterior plates 31 and 32 (see fig. 1) (see fig. 5) as necessary. The exterior plates 31 and 32 are not limited, but are made of, for example, resin or paper having insulating properties.
Fig. 4B is a cross-sectional view of the battery 1 taken along a plane (a plane crossing the external wiring 24) including the line 4B-4B in fig. 4A. The circuit board 20 is spaced apart from and faces the terrace portion 14a in the thickness direction. A protective circuit member 22 and a sealing portion 24b are provided on a surface of the circuit substrate 20 facing the terrace portion 14 a. The sealing portion 24b is made of a known adhesive, an insulating resin, or an adhesive, and seals and insulates an electrical connection portion between the external wiring 24 and the circuit board 20. A flag 27 is provided on a surface of the terrace portion 14a facing the circuit board 20. Negative electrode tab 11n and conductive tab 28 are bent between circuit board 20 and terrace portion 14 a. The buffer material 25 is interposed between the circuit substrate 20 and the stage portion 14 a. More specifically, the buffer material 25 is located between the protective circuit member 22 and the sealing portion 24b provided on the circuit substrate 20 and the terrace portion 14 a. Double-sided adhesive tapes or adhesives are attached to the upper and lower surfaces of the cushion material 25. Therefore, the circuit board 20 and the platform portion 14a are connected by the cushion material 25. The buffer material 25 is located between the negative electrode lead 11n and the conductive lead 28 in the longitudinal direction of the circuit substrate 20.
The function of the cushioning material 25 will be explained.
Fig. 6 is a cross-sectional view of the laminated battery 101 of a comparative example, similar to fig. 4B. The comparative example of fig. 6 is different from the first embodiment of fig. 4B only in that the cushioning material 25 is not provided. As in 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 and the top surface of the bump 12 of the cell 10 have substantially the same height. Therefore, as shown in fig. 6, it is necessary to apply a force F toward the terrace portion 14a to the circuit substrate 20 against the elastic reaction force of the negative electrode tab 11n and the conductive tab 28. If the force F is too large, the circuit board 20 moves more than necessary toward the terrace portion 14a, and the circuit board 20 and the mounting components (the protective circuit member 22, the closing portion 24b, and the like) mounted on the circuit board 20 collide with the flag 27 provided on the terrace portion 14a and the laminated plate constituting the terrace portion 14 a. As a result, the circuit board 20, the mounted component, and the circuit breaker 27 may be damaged (e.g., cracked or cracked), or the laminated board constituting the terrace portion 14a may be damaged. Damage to the laminated plate causes leakage of the electrolyte solution due to cracking of the laminated plate, penetration of moisture into the cell 10, and short circuit in the cell 10. The excessive force F may be applied not only when the negative electrode tab 11n and the conductive tab 28 are bent but also when the battery 101 is handled in the subsequent manufacturing process of the battery 101.
In contrast, in the present embodiment, as shown in fig. 4B, the buffer material 25 is provided between the circuit board 20 and the terrace portion 14 a. When an excessive force F is applied to the circuit substrate 20, the buffer material 25 overcomes the force F, and thus the circuit substrate 20 can be prevented from being excessively moved toward the terrace portion 14 a. The circuit substrate 20 and the mounting components (the protective circuit member 22, the closing portion 24b, and the like) do not collide with the flag 27 provided in the terrace portion 14a or the laminated plate constituting the terrace portion 14 a. Therefore, the circuit board 20, the mounting component positioned between the circuit board 20 and the stage part 14a, and the electronic components such as the circuit breaker 27 can be prevented from being damaged, and the laminated board constituting the stage part 14a can be prevented from being damaged.
Since the double-sided adhesive tape or the adhesive is attached to the upper and lower surfaces of the cushion material 25, when the circuit board 20 and the terrace portion 14A are superposed with the cushion material 25 interposed therebetween as shown in fig. 4A, the circuit board 20 and the terrace portion 14A are connected with the cushion material 25 interposed therebetween. The buffer material 25 prevents the circuit substrate 20 from coming off the terrace portion 14a against the elastic reaction force of the negative electrode lead 11n and the conductive lead 28 that separate the circuit substrate 20 from the terrace portion 14 a. Therefore, the handleability of the battery 1 in the subsequent manufacturing process of the battery 1 (for example, the attachment of the exterior plates 31 and 32) is improved, and the battery 1 is easily manufactured.
The circuit board 20 is disposed between the ear portions 14b and 14c bent in the thickness direction so as to face the terrace portion 14 a. Therefore, the circuit board 20 is prevented from protruding largely in the horizontal direction from the unit 10. The battery 1 of the first embodiment is small in size and excellent in volumetric energy density.
In the first embodiment, as shown in fig. 4B, the cushion material 25 is disposed so as not to face the flag 27. Therefore, even if an excessive force F is applied, the cushioning material 25, the circuit substrate 20, and the mounted components of the circuit substrate 20 do not contact the flag 27. Since the external force can be prevented from being applied to the flag 27, the reliability of the operation of the flag 27 can be improved.
(second embodiment)
Fig. 7A is a perspective view of a laminated battery 2 according to a second embodiment of the present invention. Fig. 7B is a cross-sectional view of the battery 2 taken along a plane including the line 7B-7B of fig. 7A.
As shown in fig. 7B, the second embodiment is different from the first embodiment in the arrangement of various components arranged between the circuit board 20 and the stage portion 14 a. In the second embodiment, the protective circuit member 22 mounted on the circuit board 20 and the circuit breaker 27 stacked on the terrace portion 14a face each other in the thickness direction. In the second embodiment, the bumps 12 are thinner than the first embodiment, and accordingly, the distance between the circuit board 20 and the terrace portion 14a is narrow. Therefore, even if the circuit substrate 20 is slightly moved toward the stage portion 14a by the application force F, the protective circuit member 22 is highly likely to collide with the flag 27.
Therefore, in the second embodiment, the buffer 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 substrate 20 (the surface opposite to the surface on which the protective circuit member 22 is mounted) is set to be substantially the same height as the top surface of the bump 12 of the unit 10, the cushioning material 25 is largely compressively deformed in the thickness direction. Since the reaction force in the thickness direction of the cushioning material 25 is large, a larger force F can be overcome. 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 flag 27 face each other in the thickness direction, the circuit board 20 and the mounting component (the protective circuit member 22, the closing portion 24b, and the like) do not collide with the flag 27 provided in the terrace portion 14a or the laminated plate constituting the terrace portion 14 a. Therefore, it is possible to reliably prevent the circuit board 20, the mounted component positioned between the circuit board 20 and the stage part 14a, and the electronic component such as the circuit breaker 27 from being damaged, and the laminated board constituting the stage part 14a from being damaged.
As in the first embodiment, the cushioning material 25 is not disposed to face the flag 27. Therefore, the buffer material 25 that is compressed and deformed does not apply an external force to the flag 27. This is advantageous in improving the reliability of the operation of the flag 27.
In the second embodiment, the longitudinal dimension of the circuit board 20 is shorter than the longitudinal dimension of the terrace portion 14 a. Since the buffer material 25 is disposed in a limited region where the circuit board 20 and the terrace portion 14a face each other so as to be able to overcome the force F, the buffer material 25 is disposed so as to be sandwiched by the bent negative electrode tab 11n as shown in fig. 7B. However, this is not essential in the second embodiment, and the buffer material 25 may be disposed at a position not in contact with the lead plates 11p and 11n, as in the first embodiment. In the present invention, the longitudinal dimension of the circuit board 20 is arbitrary, and it is preferable that the circuit board 20 is set so as not to protrude horizontally beyond the ear portions 14b and 14 c.
The second embodiment is the same as the first embodiment except for the above. The description of the first embodiment can be applied to the second embodiment as appropriate.
(third embodiment)
Fig. 8A is a perspective view of a laminated battery 3 according to a third embodiment of the present invention. Fig. 8B is a side view of the battery 3 as viewed along an arrow 8B of fig. 8A.
As shown in fig. 8A, in the third embodiment, the external wiring 24 is connected to the vicinity of the end of one side (the first ear portion 14b side) in the longitudinal direction of the circuit board 20, which is a rectangle elongated in plan view, and is led out from the side of the first ear portion 14b in parallel with the longitudinal direction of the circuit board 20 (or the terrace portion 14 a). As shown in fig. 8B, 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, as in the first embodiment. In the third embodiment, since the boss 12 is relatively thick, the bent ear portion 14b and the circuit board 20 are separated in the thickness direction. Therefore, the external wiring 24 can be led out in the horizontal direction from the circuit board 20 across the ear portion 14b without colliding with the ear portion 14 b.
The buffer materials 25a and 25b are provided between the circuit board 20 and the terrace portion 14 a. Therefore, as in the first embodiment, even if a force is applied to the circuit substrate 20 toward the terrace portion 14a, the circuit substrate 20 and the mounting components (the protective circuit member 22, the closing portion 24b, and the like) do not collide with the flag 27 provided in the terrace portion 14a and the laminated plate constituting the terrace portion 14 a. Therefore, the circuit board 20, the mounting component positioned between the circuit board 20 and the stage part 14a, and the electronic components such as the circuit breaker 27 can be prevented from being damaged, and the laminated board constituting the stage part 14a can be prevented from being damaged.
In the third embodiment, two buffer materials 25a and 25b are provided between the circuit board 20 and the terrace portion 14 a. The first cushion material 25a is disposed in the vicinity of the second ear portion 14c, and the second cushion material 25b is disposed in the vicinity of the first ear portion 14 b. The second buffer material 25b presses the external wiring 24 against the circuit board 20 so that the external wiring 24 does not hang down toward the terrace portion 14 a. Therefore, the external wiring 24 can be prevented from hanging down or colliding with the upper end of the ear portion 14 b. When the external wiring 24 collides with the ear portion 14b, the ear portion 14b is deformed and the laminated plate constituting the ear portion 14b may be damaged. Damage to the laminated plate may cause leakage of the electrolyte solution due to cracking of the laminated plate, or a short circuit in the cell 10. The second buffer material 25b is advantageous in preventing such a situation from occurring.
Like the first and second embodiments, the cushioning members 25a and 25b are disposed so as not to face the flag 27. Therefore, the buffer materials 25a, 25b that are compressed and deformed do not apply an external force to the flag 27. This is advantageous in improving the reliability of the operation of the flag 27.
In the battery 3, one of the two cushioning materials 25a and 25b may be omitted.
Fig. 9A is a perspective view of another laminated battery 3a according to a third embodiment of the present invention. Fig. 9B is a side view of the battery 3a as viewed along an arrow 9B of fig. 9A. The battery 3a is different from the battery 3 shown in fig. 8A and 8B in that a single cushioning material 25 is disposed between the circuit board 20 and the terrace portion 14a along substantially the entire region in the longitudinal direction of the circuit board 20. Since the cushioning material 25 is disposed substantially over the entire region where the circuit board 20 faces the terrace portion 14a, even if a force is applied to the circuit board 20 toward the terrace portion 14a, the circuit board 20 and the mounting members (the protective circuit member 22, the sealing portion 24, and the like) do not collide with the flag 27 provided in the terrace portion 14a and the laminated plate constituting the terrace portion 14 a. Therefore, it is possible to more reliably prevent the damage of the electronic components such as the circuit board 20, the mounting component positioned between the circuit board 20 and the terrace portion 14a, and the breaker 27, and the damage of the laminated plate constituting the terrace portion 14 a.
In the battery 3a, the cushioning material 25 is also disposed on the flag 27. However, since the cushioning material 25 is opposed to the terrace portion 14a over a wide area, the external force applied from the cushioning material 25 to the breaker 27 is relatively small.
As for the battery 3a, a configuration in which the buffer material 25 is disposed substantially over the entire region of the circuit board 20 facing the terrace portion 14a can 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 can be applied to the third embodiment as appropriate.
(fourth embodiment)
Fig. 10A is a perspective view of a laminated unit (hereinafter, simply referred to as "unit") 10B constituting a laminated battery 4 (see fig. 12A and 12B described later) according to a fourth embodiment of the present invention. Fig. 10B is a side view of the unit 10B as viewed along arrow 10B of fig. 10A. In the cell 10b of the fourth embodiment, the substantially rectangular bosses 12a, 12b corresponding to the power generating element protrude toward both sides in the thickness direction with respect to the seal regions 14a, 14b, 14 c. The first protrusion 12a protruding to one side with respect to the sealing regions 14a, 14b, 14c may have the same protrusion height as the second protrusion 12b protruding to the other side, or may have a different protrusion height. As in the unit 10b, a unit in which the projections 12a and 12b project on both sides with respect to the seal regions 14a, 14b, and 14c is generally referred to as a "two-projection type" or a "double block type" in view of the shape of the laminate 13. The direction joining the first projection 12a and the second projection 12b is referred to as "thickness direction" or "height direction".
As shown in fig. 11A and 11B, in order to reduce the outer size of the unit 10B, the ear portions 14B and 14c are bent at substantially right angles to the terrace portion 14a on the same side as the first projection 12a, as in the first embodiment. The bent ear portions 14b and 14c are fixed to the side surfaces of the first boss 12a using a double-sided adhesive tape or the like. The platform portion 14a is surrounded in three directions by the first projection 12a and the ear portions 14b, 14 c.
Fig. 12A is a perspective view of the laminated battery (hereinafter simply referred to as "battery") 4 viewed from the first protrusion 12A side. Fig. 12B is a side view of the battery 4 as viewed along an arrow 12B of fig. 12A. The flag 27 is provided on the same side face of the terrace portion 14a as the side from which the first projection 12a projects. The circuit substrate 20 is opposed to the face of the terrace portion 14a on the same side as the side from which the first projection 12a projects. The external wiring 24 is connected to the vicinity of the end of one side (the first ear portion 14b side) in the longitudinal direction of the circuit board 20, and is led out from the first ear portion 14b side in parallel to the longitudinal direction of the terrace portion 14a (or the circuit board 20).
In the unit 10b of the fourth embodiment, the ear portions 14b and 14c may be bent at substantially right angles to the terrace portion 14a on the same side as the second projection 12 b. As in fig. 12A and 12B, the circuit substrate 20 and the flag 27 are disposed on the first projection 12A side with respect to the terrace portion 14 a. Since the ear portion 14b and the external harness 24 are disposed on the opposite sides of the terrace portion 14a, the external harness 24 can be prevented from colliding with the ear portion 14 b. Therefore, the possibility of damage to the ear portion 14b due to collision of the external wiring 24 and short circuit between the external wiring 24 and the ear portion 14b can be reduced. This is advantageous for improving the safety of the battery.
The two-projection type cell 10b shown in the fourth embodiment may be applied to the batteries 1 and 2 of the first and second embodiments.
(fifth embodiment)
Fig. 13A is a perspective view of a laminated unit (hereinafter simply referred to as unit) 10c constituting a laminated battery 5 (see fig. 14A and 14B described later) according to a fifth embodiment of the present invention. Fig. 13B is a side view of the unit 10c as viewed along arrow 13B of fig. 13A. The cell 10c is a two-projection cell (see fig. 10A and 10B) similar to the cell 10B of the fourth embodiment. However, unlike the fourth embodiment, in the fifth embodiment, the first ear portion 14b is bent at substantially right angle to the terrace portion 14a on the same side as the second lug 12b, and the second ear portion 14c is bent at substantially right angle to the terrace portion 14a on the same side as the first lug 12 a. The bent first and second ear portions 14b and 14c are fixed to the side surfaces of the second and first bosses 12b and 12a, respectively, using double-sided adhesive tape or the like. The platform portion 14a is surrounded in both directions by the first projection 12a and the second ear portion 14c, and is further surrounded in both directions by the second projection 12b and the first ear portion 14 b.
Fig. 14A is a perspective view of the laminated battery (hereinafter simply referred to as "battery") 5 viewed from the first protrusion 12a side. Fig. 14B is a side view of the battery 5 as viewed along an arrow 14B of fig. 14A. The flag 27 is provided on the same side of the terrace portion 14a as the first projection 12a projects, as in the battery 4 of the fourth embodiment. The circuit substrate 20 is opposed to the face of the terrace portion 14a on the same side as the side from which the first projection 12a projects. The external wiring 24 is connected to the vicinity of the end of one side (the first ear portion 14b side) in the longitudinal direction of the circuit board 20, and is led out from the first ear portion 14b side in parallel to the longitudinal direction of the terrace portion 14a (or the circuit board 20).
In the batteries 3, 3a, and 4 according to the third embodiment, the first ear portion 14b and the external wiring 24 are disposed on the same side as the terrace portion 14 a. Therefore, there is a possibility that the external wiring 24 collides with the first ear portion 14 b. In particular, in the battery 4 using the two-tab type cell 10b, since the first tab 12a has a low height projecting from the terrace portion 14a, when the circuit substrate 20 is disposed so as not to project in the height direction from the top surface of the first tab 12a, there is a high possibility that the external wiring 24 may collide with the first ear portion 14 b.
In the fifth embodiment, since the first ear portion 14b and the external wiring 24 are disposed on the opposite sides of the terrace portion 14a, collision between the external wiring 24 and the first ear portion 14b can be avoided. Therefore, damage to the first ear portion 14b due to collision of the external wiring 24 and occurrence of short circuit between the external wiring 24 and the first ear portion 14b can be reduced. This is advantageous in improving the safety of the battery 5.
The fifth embodiment is the same as the fourth embodiment except for the above. The description of the fourth embodiment can also be applied to the fifth embodiment as appropriate.
The two-projection type cell 10c shown in the fifth embodiment can be applied to the batteries 1 and 2 of the first and second embodiments.
The above embodiments one to five are mere examples. The present invention is not limited to the first to fifth embodiments described above, and can be appropriately modified.
The arrangement of the mounting components (the protective circuit component 22, the sealing portion 24b), the positive input terminal 21p, the negative input terminal 21n, and the like on the circuit board 20 can be arbitrary. The number of the protection circuit parts 22 is also not limited. Components other than these may be provided on the circuit substrate 20.
The connection paths between the positive electrode tab 11p and the negative electrode tab 11n of the cells 10, 10a, 10b and the circuit board 20 are not limited to the first to fifth embodiments. For example, the positive electrode tab 11p and the first lead 27a of the flag 27 may be connected by other conductive tabs. The flag 27 may be provided between the negative electrode tab 11n and the negative electrode input terminal 21 n.
The flag 27 need not be provided to the stage portion 14 a. For example, the flag 27 may be provided on the same surface of the circuit substrate 20 as the surface on which the protection circuit component 22 is mounted.
The buffer materials 25, 25a, and 25b may be provided between the circuit board 20 and the terrace portion 14 a. The number, size, and the like of the cushioning materials 25, 25a, 25b can be arbitrarily set.
In the third and fourth embodiments, the external wiring 24 may be led out from not only the first ear portion 14b but also the second ear portion 14c side along the longitudinal direction of the terrace portion 14 a.
In the fifth embodiment, the external wiring 24 may be led out from the first ear portion 14b, or from the second ear portion 14c side in the longitudinal direction of the terrace portion 14 a. In this case, the first ear portion 14b is bent at substantially right angle to the terrace portion 14a on the same side as the first projection 12a, and the second ear portion 14c is preferably bent at substantially right angle to the terrace portion 14a on the side of the second projection 12 b. That is, the ear portion (14a or 14b) on the side from which the external wiring 24 is led out is preferably bent at substantially right angle to the terrace portion 14a on the side opposite to the external wiring 24.
Industrial applicability
The present invention is not limited in its field of use, but can be widely used as a battery incorporated in a portable electronic device requiring a high volumetric energy density. For example, a small-sized, 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 is preferably used.
Description of the symbols
1. 2, 3a, 4, 5-laminated type battery, 10b, 10 c-laminated unit, 11 p-positive electrode lead plate, 11 n-negative electrode lead plate, 12 a-projection, 13-laminated plate, 14 a-platform part (sealing region), 14b, 14 c-ear part (sealing region), 20-circuit substrate, 22-protective circuit member, 24-external wiring, 25a, 25 b-buffer material, 27-interrupter.
Claims (7)
1. A laminated battery comprising a laminated unit having a rectangular planar shape and a circuit board on which a protective circuit member is mounted, the laminated unit being provided with a power generating element externally covered with a flexible laminated plate,
the laminated unit includes a sealing region in which the laminated plates are stacked and sealed,
the sealing region includes a terrace portion along a side from which a positive electrode lead plate and a negative electrode lead plate connected to the power generating element are led out,
the circuit board is disposed so that a surface on which the protective circuit component is mounted faces the stage portion and faces the stage portion,
a buffer material capable of being compressed and deformed is provided between the circuit board and the stage portion,
a double-sided adhesive tape or an adhesive is stuck to both surfaces of the cushion material so that the circuit board and the land portion are connected with the cushion material interposed therebetween.
2. The laminated battery according to claim 1,
a circuit breaker for interrupting current in case of abnormal overheat is provided on a surface of the stage portion facing the circuit board or a surface of the circuit board on which the protective circuit member is mounted,
the buffer material is disposed so as not to face the breaker.
3. The laminated battery according to claim 1,
the cushioning material is compressively deformed in a direction in which the circuit board and the stage portion face each other.
4. The laminated battery according to claim 1,
further comprises an external wiring connected to a surface of the circuit board facing the stage portion,
the external wiring is led out in parallel to the longitudinal direction of the stage.
5. The laminated battery according to claim 4,
the buffer material is disposed so as to press the external wiring against the circuit board.
6. The laminate type battery according to claim 1,
the laminated unit includes a projection projecting to one side with respect to the terrace portion in correspondence with the power generating element,
the sealing region includes a first ear portion and a second ear portion connected to both ends of the platform portion in a direction perpendicular to the side along which the platform portion is located,
the first ear portion and the second ear portion are bent at right angles to the same side as the projection,
the circuit board is disposed on the same side of the platform as the protrusion.
7. The laminated battery according to claim 1,
the lamination unit includes a first projection projecting toward one side with respect to the stage corresponding to the power generating element and a second projection projecting toward the other side with respect to the stage corresponding to the power generating element,
the sealing region includes a first ear portion and a second ear portion connected to both ends of the platform portion in a direction perpendicular to the side along which the platform portion is located,
the first ear portion is bent at right angles to the same side as the first projection or the second projection,
the second ear portion is bent at right angles to the same side as the first projection or the second projection,
the circuit substrate is disposed on the same side of the platform portion as the first protrusion.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-198735 | 2017-10-12 | ||
| JP2017198735 | 2017-10-12 | ||
| JP2018019051A JP7033459B2 (en) | 2017-10-12 | 2018-02-06 | Laminated battery |
| JP2018-019051 | 2018-02-06 | ||
| PCT/JP2018/037036 WO2019073879A1 (en) | 2017-10-12 | 2018-10-03 | Laminate battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111052438A CN111052438A (en) | 2020-04-21 |
| CN111052438B true CN111052438B (en) | 2022-08-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880056040.4A Active CN111052438B (en) | 2017-10-12 | 2018-10-03 | Laminated battery |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7033459B2 (en) |
| CN (1) | CN111052438B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220075989A (en) | 2020-11-30 | 2022-06-08 | 삼성에스디아이 주식회사 | Battery pack |
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| JP2017168183A (en) * | 2014-08-01 | 2017-09-21 | 三洋電機株式会社 | Battery pack |
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| CN1412866A (en) * | 2001-10-16 | 2003-04-23 | 日电东金栃木有限公司 | Battery |
| JP2003168408A (en) * | 2001-11-30 | 2003-06-13 | Toshiba Corp | Battery pack |
| CN1906779A (en) * | 2004-01-30 | 2007-01-31 | 株式会社Lg化学 | Battery having specific package structure |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP7033459B2 (en) | 2022-03-10 |
| JP2019075358A (en) | 2019-05-16 |
| CN111052438A (en) | 2020-04-21 |
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