JPH05159808A - Layered thin-type battery - Google Patents

Abstract

PURPOSE:To improve radiation efficiency for preventing a rise of battery inner temperature by providing a ventilation path on a lamination part of a thin type battery with a discharge fin. CONSTITUTION:A strip current collecting terminal is held on the upper terminal part provided with a collecting terminal having a notch part while a positive electrode active material 4 is held on the surface of a positive electrode collector 1 provided with a radiation fin 3 an the side end part and a sealing agent is arranged around this material 4. A thin type cell is formed by having a carbonaceous material on the front and rear sides of a similar negative electrode collector 7 having a radiation fin 11 or by making them to hold a negative electrode active material 8 consisting of lithium. Then, thin type cells are laminated through the frame bodies 12 and the lamination part is provided with a ventilation path 13. This constitution with a heightened radiation effect prevents a rise of a battery inner temperature and cuts off inferior thin type cells while the notch part of the positive electrode terminal serves as a fuse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery structure of a thin battery used in fields such as electronic equipment and electric vehicles.

[0002]

2. Description of the Related Art Conventionally, a thin battery of this type has a structure as shown in FIG. 1, in which a positive electrode current collector is provided above and below a power generating element in which a positive electrode active material layer, an electrolyte layer and a negative electrode active material layer are layered. A body-cum-battery and a negative electrode current-collector-cell were arranged, and the adhesive resin and the current-collector-cell were integrated, and these were laminated as shown in FIG. In such a conventional configuration, when the power consumption is increased, heat is accumulated inside the battery and the battery temperature rises, and in the worst case, the battery may ignite or burst.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and does not cause the internal temperature of the battery to rise even if the power consumption increases when the battery is used, and prevents the ignition and the explosion. It is an object of the present invention to provide a laminated thin battery having a negative opening function and improved heat dissipation efficiency.

[0004]

In order to achieve the above-mentioned object, the present invention has a strip-shaped positive electrode current collector terminal (having solder at the upper end portion) having a partial defect at the upper end portion of the positive electrode current collector holding the positive electrode active material. Coated) and radiating fins on the side edges,
A strip-shaped negative electrode current collector terminal (having solder coated on the upper end portion) having a partial defect at the upper end portion of the negative electrode current collector that holds the negative electrode active material, and heat radiation fins provided at the side edges, And arranging a sealing agent around the periphery of the current collector excluding the current collecting terminal portion, stacking the respective electrode current collectors on each other and adhering the sealing agent, and sealing the inside of the battery under reduced pressure, a laminated thin battery Re-stacking with a frame body that serves as an air passage between them, providing a cut portion in a part of the band portion of the current collecting terminal, and providing a bent portion above the cut portion so that the bent portions are adjacent to each other. Joined with the terminal of the pole, each collector terminal is arranged laterally offset from each other, and the upper end of the band portion of each collector terminal is integrally joined,
The negative and heat radiating fins are provided on opposite sides of each other.

[0005]

In the present invention, the current collector is provided with a band-shaped collector terminal (a part of which is provided with a cutout) at the upper end of the collector plate and a radiation fin at the side end of the collector to retain the active material in the center. A positive electrode current collector plate and a negative electrode current collector, each having a sealing agent on the periphery thereof, are laminated and sealed. In such a battery, since the heat radiation fins are arranged independently of each other and / or the ventilation passage is provided between the laminated batteries, it is possible to radiate heat without electrically shorting even if the battery temperature rises, and to integrate the batteries. A defective battery is separated by the partially missing portion of each of the collected current collecting terminals to prevent an abnormal temperature rise. Also, since they are independent of each other, they will not be reconnected with these debris. Further, by coating the tip of the terminal portion with zinc, tin-zinc, or tin-lead alloy, it becomes easy to connect them to each other. Further, since the above processing is continuously performed on the same electrode plate, it is possible to manufacture with high productivity.

[0006]

EXAMPLES Details of the present invention will be described below with reference to examples. As shown in FIG. 3, the positive electrode current collector 1 (stainless steel current collector) having a vertical length of about 54 mm and a horizontal length of about 86 mm is provided with a positive electrode terminal 2 having a partially defective portion 2 ′, and the side Radiating fins 3 (width of about 6 mm) were provided at the ends. Next, the positive electrode active material 4 containing manganese dioxide as a main component is screen-printed (vertical length: about 50 mm, lateral length: about 76 mm) on the front and back surfaces of the central portion (however, only one surface of the electrode plate located at the end),
Further, a solid polymer electrolyte 5 obtained by adding lithium perchlorate to polyethylene oxide so as to cover the surface of the positive electrode active material.
Was also screen printed. Next, a sealing agent 6 made of polypropylene-based heat-adhesive resin or the like was adhered to the periphery. As shown in FIG. 4, lithium is formed on the front and back surfaces of the negative electrode current collector 7 (stainless steel current collector) having substantially the same shape as the positive electrode current collector 1 (however, only one surface of the electrode plate located at the end). The negative electrode active material 8 was screen printed, and the polymer solid electrolyte 9 in which lithium perchlorate was added to polyethylene oxide was also screen printed so as to cover the surface of the negative electrode active material. Then, the sealing agent 6 was adhered to the periphery in the same manner as described above. As shown in the cross-sectional view of FIG. 5, the positive electrode current collector and the negative electrode current collector processed in this way are repeatedly laminated, and a sealing agent 6 made of polypropylene-based heat-adhesive resin or the like is heat-sealed to each other to form a battery inside. Was vacuum sealed. The thickness of the power generation element composed of the positive electrode active material, the electrolyte layer, and the negative electrode active material layer was 0.2.
~ 1.0 mm. Further, as shown in the sectional view of FIG.
These laminated batteries were further laminated with the frame body 12 sandwiched therebetween.
At this time, the ventilation passage 1 is provided between the current collectors by the frame body 12 between the current collectors.
3 is formed.

An example of the laminated battery thus obtained is shown in the perspective view of FIG. Next, except for the tips of the terminals, the other portions were masked, and fine zinc powder was sprayed on the tips of the terminals (this step is better performed in advance when forming the electrode plate, etc.). Next, the tips of the terminals were integrally heat-sealed.
At this time, as shown in FIG. 8, a bent portion is provided so that the lower portion of the terminal does not come into contact with the lower portion, and the width of the lower portion of the terminal is narrower than that of the upper portion. Similarly, FIG.
As shown in, the width below the defective portion may be narrower than that above, without providing the bent portion.

Table 1 shows changes in the battery temperature at the time of high rate discharge for each of the 5 cells of the batteries A and B according to the embodiment of the present invention and the battery of the conventional structure. In addition, A is a battery provided with the ventilation passage 13, and B is a battery not provided with it.

[0009]

Further, regarding the electrical safety when a plurality of these batteries are laminated, it was investigated whether or not the defective battery is disconnected from the electrical circuit.

Conventionally, current always flows through a defective battery to deteriorate the overall battery characteristics, but when the batteries according to the present invention are stacked, the defective battery is separated from the defective portion of the terminal. Furthermore, the normal terminal and the defective terminal were insulated from each other.

[0012]

As described above, according to the present invention, the safety of the battery can be improved and the battery can be mounted on the electronic equipment and the electric vehicle, and the reliability is high and the industrial value is extremely large as compared with the prior art.

[Brief description of drawings]

FIG. 1 is a perspective view of a conventional thin battery.

FIG. 2 is a perspective view showing a state in which conventional thin batteries are stacked.

FIG. 3 is a perspective view of a positive electrode current collector of the thin battery of the present invention.

FIG. 4 is a perspective view of a negative electrode current collector of the thin battery of the present invention.

FIG. 5 is a sectional view of a laminated thin battery of the present invention.

FIG. 6 is a cross-sectional view of a laminated thin battery of the present invention.

FIG. 7 is a perspective view of a laminated thin battery of the present invention.

8A and 8B are a front view and a cross-sectional view of the integrated joining of the terminals of the present invention.

9A and 9B are a front view and a sectional view of the integrated joining of terminals of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode collector 2 Positive electrode terminal 2'missing part 3 and 11 Radiating fin 6 Sealing agent 7 Negative electrode current collector 10 Negative electrode terminal 10 'Missing part 12 Frame body 13 Ventilation path 14 Terminal

Claims (6)

[Claims] 1. A laminated thin battery in which thin batteries composed of a power generation element in which a positive electrode active material, an electrolyte layer, and a negative electrode active material are layered are laminated, and a strip-shaped positive electrode current collector terminal is provided on an upper end portion of a positive electrode current collector. And providing a heat radiation fin at the side end, holding a positive electrode active material on the front and back surfaces of the positive electrode current collector excluding the positive electrode current collector terminal and the heat radiation fin, and arranging a sealing agent on the periphery of the positive electrode active material. A strip-shaped negative electrode current collector terminal at the upper end of the negative electrode current collector and heat radiation fins at the side ends, and a carbonaceous material on the front and back surfaces excluding the negative electrode current collector terminal and the heat radiation fins of the negative electrode current collector. Holding the negative electrode or the negative electrode made of lithium, arranging a sealing agent on the periphery of the negative electrode, laminating the respective electrode current collectors and adhering the sealing agents to each other, and sealing the inside of the battery under reduced pressure , Each pole current collector terminal is joined respectively Laminated thin battery. 2. A laminated thin battery in which a thin battery composed of a power generating element in which a positive electrode active material, an electrolyte layer and a negative electrode active material are layered is laminated, and a strip-shaped positive electrode current collector terminal is provided on an upper end portion of a positive electrode current collector. And providing a heat radiation fin at the side end, holding a positive electrode active material on the front and back surfaces of the positive electrode current collector excluding the positive electrode current collector terminal and the heat radiation fin, and arranging a sealing agent on the periphery of the positive electrode active material. A strip-shaped negative electrode current collector terminal at the upper end of the negative electrode current collector and heat radiation fins at the side ends, and a carbonaceous material on the front and back surfaces excluding the negative electrode current collector terminal and the heat radiation fins of the negative electrode current collector. Holding the negative electrode or the negative electrode made of lithium, arranging a sealing agent on the periphery of the negative electrode, laminating the respective electrode current collectors and adhering the sealing agents to each other, and sealing the inside of the battery under reduced pressure , Each of the pole current collector terminals being joined together, and those The laminated thin battery is characterized in that the laminated thin batteries are laminated again with a frame body serving as an air passage interposed therebetween. 3. The laminated thin battery according to claim 1, wherein a defective portion is provided in a part of the band portion of each current collector terminal. 4. The laminated thin battery according to claim 1, 2 or 3, wherein the current collecting terminals are arranged laterally offset from each other. 5. The negative electrode heat radiation fin and the positive electrode heat radiation fin are provided on opposite sides of each other.
2. The laminated thin battery according to 2, 3, or 4. 6. The integrated joint portion of each current collector terminal is coated with a metal selected from zinc, tin-zinc alloy, and tin-lead alloy in advance, and melts each other when integrated. The laminated thin battery according to claim 1, 2, 3, 4 or 5.