JP2006147477A - Polymer battery and housing with built-in battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polymer battery that can be manufactured easily, and a case with a built-in battery to have a built-in polymer battery. <P>SOLUTION: A first lead frame (12) having a plurality of anode parts, a second lead frame (13) having a plurality of cathode parts, and a polymer electrolyte (17) arranged between the anode parts and the cathode parts are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a polymer battery and a battery built-in case containing the polymer battery.

  Some conventional battery storage belts have a plurality of batteries connected via wires (see, for example, Patent Document 1 and Patent Document 2). In addition, there is a unit cell that is laminated and integrated in a bag-like outer case.

  In Patent Document 1, as shown in FIG. 8, a plurality of button-type batteries 33 are built in a garment belt body 32, and wiring 35 for connecting these batteries 33 is provided. In addition, a garment belt main body 32 is provided with a connector 37 for supplying the power of the battery 33 to the outside.

  As another configuration in Patent Document 1, a plurality of battery cases each including a plate-like gum-type battery are arranged at intervals in the middle of a belt body for clothes, and the batteries are connected between the battery cases. Wiring is applied.

In Patent Document 2, as shown in FIG. 9, a sheet-like or film-like positive electrode plate is placed in a bag-like outer case 47 made of a laminate sheet in which a metal foil is arranged between resin films and the whole is laminated and integrated. A power generation element 44 in which a polymer separator and a negative electrode plate are laminated and integrated is accommodated. The positive electrode lead 45 and the negative electrode lead 46 that connect the one ends 41 and 42 of the positive electrode plate and the negative electrode plate are sealed in a state of being pulled out from the seal portions 48 and 49 of the outer case 47.
JP-A-6-302307 (paragraph numbers 0006 to 0008, FIG. 2) Japanese Patent Laid-Open No. 2001-210372 (paragraph numbers 0009 to 0012, FIG. 1, etc.)

  As in the belts disclosed in Patent Documents 1 and 2 described above, in a configuration using a button type battery or a gum type battery, the thickness of the belt becomes thick or the belt becomes heavy. Moreover, in the structure shown in patent document 1, 2, since a several button type battery etc. are individually attached to a belt and the connection between these batteries is performed, it is not preferable at the point of productivity. Moreover, it can be bent only in one direction.

  The polymer battery of the present invention is disposed between a first lead frame having a plurality of positive electrode portions, a second lead frame having a plurality of negative electrode portions, and the positive electrode portion and the negative electrode portion. And a polymer electrolyte.

  According to the polymer battery of the present invention, the polymer battery can be easily manufactured by simply stacking the first and second lead frames with the polymer electrolyte interposed therebetween.

  Examples of the present invention will be described below.

  FIG. 1 is a schematic diagram showing the configuration of a soft case (battery built-in case) with a built-in polymer battery that is Embodiment 1 of the present invention.

  In FIG. 1, 1 is a soft case having flexibility, and 2 is a polymer battery. A polymer battery 2 sandwiched between film sheets as described later is housed between the outer wall and the inner wall on the four side surfaces, the lid surface, and the bottom surface of the soft case 1. The polymer battery 2 can be reduced in thickness and weight, and is flexible enough to keep the shape of the soft case 1 from collapsing. For this reason, the polymer battery 2 is suitable as an internal component of the soft case 1.

  By storing the polymer battery 2 on the four sides of the soft case 1, the cover surface and the bottom surface, it is possible to supply power for using the portable device stored in the soft case 1 for a long time. .

  In this embodiment, the case where the polymer battery 2 is housed on all surfaces (six surfaces) of the soft case 1 has been described. However, the polymer battery 2 is housed on any surface instead of all surfaces. May be. However, by providing the polymer battery 2 on all sides of the soft case 1, the most power can be supplied.

  On the other hand, by using the polymer battery 2 having flexibility, the polymer battery 2 can be accommodated in a state matched to the surface of the soft case 1 having a curved surface.

  Next, the configuration of the polymer battery 2 will be described with reference to FIGS.

  FIG. 2 is a front view of the polymer battery. In FIG. 2, 3 is a battery portion of the polymer battery 2. 4a, 4b, 4c are polymer battery sheets, and these polymer battery sheets have the same configuration. Reference numerals 5b and 5c denote wirings for connecting the polymer battery sheets 4a and 4b and the polymer battery sheets 4b and 4c, respectively.

  5 a is a wire connecting the battery part 3 and the connector 6. The connector 6 is used for outputting the electric power generated in the battery part 3 to the portable device 20 or used for charging the battery part 3. Examples of the portable device 20 include a video camera and a mobile phone in addition to the digital camera shown in FIG.

  Reference numeral 3 a denotes a film sheet that constitutes the surface of the battery part 3. Here, the battery part 3 is formed by sandwiching the polymer battery sheets 4a to 4c, the wirings 5b and 5c, and the wire 5a between the two film sheets 3a and thermocompression bonding.

  As shown in FIG. 2, the polymer battery 2 of this example is obtained by connecting polymer battery sheets 4a to 4c in series via wires 5b and 5c. Here, when a polymer battery is comprised with a lithium ion battery, the voltage of one battery sheet among polymer battery sheets 4a-4c will be 3.7V on average. For this reason, the whole polymer battery 2 becomes 11.1 V (3.7 V × 3).

  The charging voltage is 12.6 V (4.2 V × 3), and the output voltage of the connector 6 is about 12.6 V to 9 V (about 3.0 V × 3).

  FIG. 3 is a diagram showing a configuration of one polymer battery sheet. In FIG. 3, 7 is a protection circuit board. The protective circuit board 7 prevents overvoltage charging when the polymer battery cells 11a to 11i are constituted by cobalt-based lithium ion batteries. And is provided to prevent overcurrent.

  In the case where the polymer battery cells 11a to 11i are constituted by manganese-based lithium ion batteries, a protective element such as PTC for preventing overcurrent may be used instead of the protective circuit board 7.

  Reference numeral 8 denotes wirings for connecting lead frames 12 and 13 described later and the protection circuit board 7. Reference numeral 9 denotes an insulating film (insulating sheet) for insulating the lead frames 12 and 13. The insulating film 9 is disposed between the lead portion 12 a of the lead frame 12 and the lead portion 13 a of the lead frame 13.

  Reference numeral 10 denotes a film (sheet material), which is thermocompression bonded with polymer battery cells 11a to 11i, a lead frame 8, and an insulating film 9 to be described later interposed therebetween. 11a to 11i are polymer battery cells.

  Reference numeral 12 denotes a positive electrode lead frame having a plurality of positive electrode portions 12b and lead portions 12a connecting the positive electrode portions 12b as shown in FIG. Reference numeral 13 denotes a negative electrode lead frame having a plurality of negative electrode portions 13b and lead portions 13a connecting the negative electrode portions 13b as shown in FIG.

  In the present embodiment, the negative electrode portion 13b and the positive electrode portion 12b constituting part of the polymer battery cells 11a to 11i are connected via the lead portions 13a and 12a, and are integrally formed as the lead frames 12 and 13. It is configured. Here, the lead frames 12 and 13 have flexibility.

  Each polymer battery cell 11a to 11i is formed by sandwiching the lead frames 12 and 13 between two film sheets 10 constituting the outer surface and thermocompression bonding. Here, the insulating film 9 is disposed between the lead portions 12a and 13a of the lead frames 12 and 13, and the lead portions 12a and 13a are insulated from each other.

  In the present embodiment, the end faces of the lead frames 12 and 13 and the protection circuit board 7 are connected using the wiring 8, but the lead frames 12 and 13 may be directly connected to the protection circuit board 7.

  The voltage output from the polymer battery cells 11 a to 11 i to the protection circuit board 7 via the wiring 8 is supplied to an external portable device via the connector 6. Moreover, the electric power supplied from the outside is charged to the polymer battery cells 11 a to 11 i via the connector 6 and the protection circuit board 7.

  The polymer battery cells 11a to 11i are arranged in a planar shape, and the polymer battery cells are insulated by thermocompression bonding of the two film sheets 10 as described above. For this reason, the polymer battery cells 11a to 11i function as individual battery cells. The flexibility of the polymer battery 2 can be increased by downsizing each of the polymer battery cells 11a to 11i.

  6 is a cross-sectional view of the polymer battery sheets 4a to 4c, that is, a cross-sectional view taken along line AA of FIG. FIG. 7 is a longitudinal sectional view of the polymer battery cell, that is, a BB sectional view of FIG.

  After arranging the lead frame 12, the polymer battery cells 11a to 11i, the lead frame 13, the insulating film sheet 9, and the protective circuit board 7 on one of the two film sheets 10, another film sheet is arranged. 10 is piled up. And the polymer battery sheets 4a-4c are comprised by thermocompression bonding.

  In FIG. 7, 14 is a positive electrode active material layer, 15 is a separator, 16 is a negative electrode active material layer, and 17 is an electrolyte gel layer (polymer electrolyte).

  The polymer battery cells 11a to 11i include a film sheet 10, a lead frame 12, a positive electrode active material layer 14, an electrolyte gel layer 17, a separator 15, a negative electrode active material layer 16, a lead frame 13, and a film sheet in order from the lower side of FIG. 10 are stacked. Here, the insulating film 9 is disposed between some regions of the lead frames 12 and 13. By thermocompression bonding the above-described laminate, the polymer battery cells 11a to 11i are sealed.

  Before the polymer battery cells 11a to 11i are subjected to thermocompression bonding, the battery part 3 is charged so that the charged charges can be discharged, and then the two film sheets 10 are thermocompression bonded.

  The electrolyte gel layer 17 is configured by squeezing the electrolyte solution into the gel material, and there is little possibility of the electrolyte solution leaking out. In addition, by forming the outer surface of the polymer battery cell with the flexible film sheet 10, the internal electrolyte solution does not leak. And the malfunction that wiring will be cut | disconnected by the leakage of electrolyte solution can be prevented.

  According to the present embodiment, the negative electrode and the positive electrode of each of the polymer battery cells 11a to 11i are constituted by the integrally processed lead frames 12 and 13 so that the connection between the polymer battery cells is performed in the battery manufacturing process. Can do. For this reason, the productivity of a battery can be improved compared with the case where the connection between batteries is performed after the batteries are mounted on the belt as in the prior art.

  Further, in this embodiment, since the polymer battery formed by sandwiching each polymer battery cell between two film sheets 10 and thermocompression bonding is used, the soft case 1 has a side surface, a lid surface, and a bottom surface. The battery can be incorporated even in a narrow space between the outer wall and the inner wall.

  Conventional polymer battery cells are manufactured one by one by folding the exterior film, but in this embodiment, each polymer battery cell is manufactured by covering with two film sheets 10 and thermocompression bonding. Thereby, the bending force at the time of bending a film like the prior art is not added with respect to structural materials, such as a collector of a polymer battery cell, an active material, and a gel. Moreover, a plurality of polymer battery cells can be easily manufactured as compared with the case where battery cells are manufactured one by one by folding the film.

  In the polymer battery cell of the conventional example, the current collector and the lead are separated from each other, and an operation of connecting them is necessary. In this embodiment, a plurality of negative electrodes and positive electrodes constituting the polymer battery cell are used. Are integrally configured, the polymer battery cells can be connected in the manufacturing process of the polymer battery 2.

  In this embodiment, the shape of the positive electrode lead frame 12 and the shape of the negative electrode lead frame 13 are different from each other, but the shape of these lead frames may be the same. In this case, the two lead frames can be arranged so that the lead portions are located on both sides of the region where the positive electrode portion and the negative electrode portion overlap, that is, the two lead portions do not overlap. . If it arrange | positions in this way, it becomes unnecessary to insulate between lead parts and it becomes unnecessary to provide the insulating film 9.

  In Patent Document 2, the power generation element is housed in a bag-shaped outer case, and the positive electrode lead and the negative electrode lead are drawn out from the seal portion of the outer case. It is necessary to connect the batteries using a wire.

  On the other hand, in this embodiment, each of the negative electrodes and the positive electrodes of a plurality of polymer battery cells is constituted by one lead frame, and the insulating film 9 is arranged between the lead portions of the two lead frames, so that It can be formed in a flat plate shape. Accordingly, the film sheet 10 is flexible and can form a thin polymer battery 2, and the polymer battery 2 can be stored in a narrow space on each surface of the soft case 1.

It is an external appearance perspective view of the soft case which incorporated the polymer battery which is Example 1 of this invention. It is a figure which shows the structure of a polymer battery. It is a front view of a polymer battery sheet. It is a front view of the lead frame of a positive electrode. It is a front view of the lead frame of a negative electrode. It is a cross-sectional view of a polymer battery sheet. It is a longitudinal cross-sectional view of a polymer battery cell. It is a figure (AD) which shows the structure of the conventional battery storage belt. It is a figure which shows the structure of the conventional battery storage case.

Explanation of symbols

1 Soft case (case body)
2 Polymer battery 12 Positive electrode lead frame (first lead frame)
13 Negative electrode lead frame (second lead frame)
17 Electrolyte gel layer (polymer electrolyte)

Claims (8)

A first lead frame having a plurality of positive electrode portions;
A second lead frame having a plurality of negative electrode portions;
A polymer battery comprising: a polymer electrolyte disposed between the positive electrode portion and the negative electrode portion.   The polymer battery according to claim 1, wherein the polymer electrolyte is contained in a gel material.   2. The polymer battery according to claim 1, wherein a plurality of battery cells each formed of the positive electrode portion, the negative electrode portion, and the polymer electrolyte are sealed for each of the battery cells by a sheet material. .   The plurality of battery cells are sealed by pressure-bonding the first sheet material disposed on the positive electrode portion side and the second sheet material disposed on the negative electrode portion side between the battery cells. The polymer battery according to claim 3.   The insulating sheet material is arrange | positioned between the lead part of the said 1st lead frame, and the lead part of the said 2nd lead frame, The Claim 1 characterized by the above-mentioned. Polymer battery.   6. The lead portion of each of the first and second lead frames is connected to a circuit board or an element for protecting each battery cell. Polymer battery. The case body,
A polymer battery according to any one of claims 1 to 6,
The battery case, wherein the polymer battery is disposed between an outer surface and an inner surface of at least one surface portion constituting the case body. The battery built-in case according to claim 7, wherein the case body is formed of a flexible member.

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