JPH05275088A - Laminated thin type battery - Google Patents

Abstract

PURPOSE:To make it excellent in heat radiation property and safety and improve the temperature distribution of each part of a battery without raising the inside temperature of the battery even if the power consumption enlarges at use of the battery by providing a heat radiation fin at the end of the long side of the collector of positive and negative each pole. CONSTITUTION:A positive pole terminal 9 doubling as a heat radiation fin 8 is provided at the upper end of a positive pole collector 7, and further a tuck as a fuse part is provided between the heat radiation fin 8 and the positive pole collector 7. Furthermore, they are coupled by adjacent positive pole collector 7' and the top of the terminal 9 and couplings A, B, and C below the fuse. Moreover, zinc powder 11 is applied on the pointed end of the terminal 9. Next, positive pole active material 12, which has manganese dioxide for its main ingredient, is screen-printed on the collector face, and further high polymer solid electrolyte 13 is screen-printed on the surface similarly. Next, a sealing agent 14 is bonded to the periphery of he collector 7 including the couplings B and C. The negative pole collector also is manufacture in approximately the same constitution as the above positive pole collector 7, and they are laid on top of the other so as to constitute a laminated thin type battery.

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. 7 and has upper and lower surfaces of a power generating element in which a positive electrode active material layer 1, an electrolyte layer 2 and a negative electrode active material layer 3 are laminated in layers. A positive electrode collector / cumulative vessel 4 and a negative electrode collector / cumulative vessel 5 were arranged in the above, and each collector / cumulative vessel was integrated with an adhesive resin 6. In order to further increase the capacity, the layers were stacked as shown in FIG.

[0003]

In such a conventional structure, when the power consumption is increased, heat is accumulated in the battery and between the batteries to raise the battery temperature, and in the worst case, the battery is ignited or explodes. was there. The present invention has been made in view of the above problems, and does not increase the internal temperature of the battery because the battery is cooled by the radiation fins even when the power consumption increases when the battery is used. To provide an improved laminated thin battery, and to improve the temperature distribution of each part of the battery when the temperature is kept at about 50 ° C to 60 ° C in order to improve the battery characteristics (output, energy efficiency, etc.) of the laminated battery. The purpose is.

[0004]

In order to achieve the above object, the present invention provides a terminal portion on the upper part of a current collecting plate, and provides a terminal portion with a hole or notch to form a fuse portion. The portion is a heat radiation fin, a plurality of the current collectors are laterally coupled, and the coupling portion is a terminal portion above the fuse portion and a current collector side end portion below the fuse portion. thing,
Holding the current collector with an electrode material and an electrolyte, adhering a sealing agent to the surface of the current collector including the electrode material, the peripheral region of the electrolyte, and the connecting portion, and the positive electrode terminal part for each of the positive electrode and the negative electrode produced. And facing each other so that the negative electrode terminal portion is on top and bottom, fusing the sealing agent of each electrode current collector surface to each other, or or sealing agent is placed on the outer surface of the current collector to wrap the entire battery Making a battery element, folding the battery element or winding it in a spiral shape around an electric insulating material, and the thickness of the battery element is 0.1 mm to 0.5 m
At m, the sealing materials of the battery elements are fused and then sealed inside the battery element in a depressurized state, or the battery element that is previously depressurized and sealed is folded, and the heat dissipation fin of the sealed laminated thin battery is The holes or cutouts should be used as ventilation paths, and the negative and positive radiating fins should be provided on opposite sides (for example, above and below) of the negative and positive terminals, respectively. Zinc, tin-zinc alloy, which is provided in advance on the conductor and the joint (for example, the tip of the radiating fin or the surface of the inter-cell connection conductor),
It is characterized by being joined with a metal selected from a tin-lead alloy.

[0005]

In the present invention, a radiation fin having a plurality of holes or cutouts is provided at the long side end of each ribbon-shaped current collector holding an active material, and the battery elements are folded and laminated. Thereafter, the cooling capacity of the battery is increased by joining the inter-battery connecting conductor to the tip of each heat radiation fin. That is, according to the contents of claims 1 and 2, a battery element excellent in heat dissipation efficiency and safety (disconnection of defective battery, prevention of temperature rise, etc.) is provided. According to the contents of claim 3, a large-capacity battery structure having excellent heat dissipation efficiency is provided. Further, according to the contents of claim 4, the cooling rate and efficiency are increased when the battery temperature rises, the airtightness of the battery is increased, and the internal resistance is lowered. Further, according to the contents of claim 5, the current collection efficiency and the heat radiation efficiency are improved and the temperature distribution of the battery is improved. According to the sixth aspect of the present invention, the current collecting terminal is integrated, and the connection with the electrically good conductor (electrical connection body) for enhancing the heat dissipation effect is facilitated and ensured, and the battery is easily assembled.

[0006]

The details of the present invention will be described below with reference to an embodiment. As shown in FIG. 1, a positive electrode terminal 9 which also serves as a heat radiation fin 8 is provided on the upper end of the positive electrode current collector 7, and a cut portion (a fuse portion) between the heat radiation fin 8 and the positive electrode current collector 7 ( Provide a hole 10),
Further, they are connected (connecting parts A, B and C) at at least two places (three places in FIG. 1) below the fuse part and the upper end of the positive electrode current collector 7 ′ and the terminal part 9. ..
(In the case of claim 1, the connecting portion and fuse portion B and C are not provided.) This connection is preferably processed simultaneously when the current collector, the terminal portion and the fuse portion are manufactured. preferable.
Further, zinc powder 11 was applied to the tips of the terminals. Next, a positive electrode active material 12 containing manganese dioxide as a main component is screen-printed on the surface of the current collector, and a solid polymer electrolyte 13 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 14 made of polypropylene-based thermo-adhesive resin, etc.
Was adhered to the peripheral portion (including fuses B and C) of the current collector. (In the case of claim 1, the sealing material is adhered only to the peripheral portion of each current collector.) In addition, the negative electrode current collector 15 (negative electrode terminal 17, radiating fins, notches) is configured in substantially the same manner as the positive electrode current collector 7. Part, a negative electrode made of a carbonaceous material and composed of an electrolyte containing lithium ions and a sealing agent 18). Further, a sealing agent 16 that further surrounds the entire battery after the battery was assembled was adhered to the surface of these current collectors opposite to the electrode active material holding surface. The sealing agent 16 may be adhered in advance before processing the current collector. The structure of the current collector in the case of manufacturing the first aspect is shown in FIG. 2 for reference. Next, as shown in the cross-sectional view of FIG. 3, in the battery element in which the positive electrode current collector 7 and the negative electrode current collector 15 processed in this way are overlapped, the sealing agents 14 and 18 are heat-sealed to each other, and It was vacuum sealed. Further, a perspective view when the battery is folded is shown in FIG. 4 (enlarged by a thickness direction arrow). An example of the case where this battery is made into a spiral shape is shown in FIG.

A plurality of the thus obtained laminated thin batteries shown in FIG. 4 are arranged on an electrical connector (not shown), and zinc is applied to the terminals 9 and 17 which also serve as heat radiation fins. The powder 11 was melted by heat and the terminals having the same polarity and the terminals and the electrical connecting body were joined together.

Regarding an assembled battery in which five batteries are connected in parallel according to the embodiment of the present invention and five batteries having a conventional structure are connected in parallel, the battery at high rate discharge when the battery temperature is kept at about 55 ° C. The maximum temperature is shown in Table 1.

[0009]

At this time, in some conventional batteries, gas is generated inside the battery to expand and damage the battery. Two of the five damaged batteries were generated, and among them, the one located at the center of the laminated battery elements was damaged.

Further, the optimum value of the thickness of the battery element was determined from the amount of helium leak and the electric resistance value between the current collectors. In this case, the battery was configured such that the active material, the electrolyte and the like were not placed inside and other factors (contact of the active material and the electrolyte, wettability, influence of vapor pressure, etc.) were not included in the measurement. The results are shown in Table 2. The helium leak test was conducted by heat-sealing in a helium gas atmosphere of about 0.1 atm, and measuring the amount of helium gas leaked from the battery in which helium gas was sealed in the battery. The unit of the amount of helium leak is atm · cc / sec.

[0012]

As can be seen from Table 2, the thickness of the battery element is preferably in the range of about 0.1 mm to 0.5 mm.

[0014]

As described above, the present invention enhances the safety of the battery (prevents temperature rise) and can be easily installed in electronic devices and electric vehicles that require a large battery capacity structurally. In comparison, it is highly reliable and its industrial value is extremely high.

[Brief description of drawings]

FIG. 1 is a perspective view of a positive electrode current collector (or a negative electrode current collector) of a thin battery of the present invention.

FIG. 2 is a perspective view of another positive electrode current collector (or negative electrode current collector) of the thin battery of the present invention.

FIG. 3 is a cross-sectional view of a battery element of the thin battery of the present invention.

FIG. 4 is a perspective view when the battery element of the thin battery of the present invention is folded.

FIG. 5 is a perspective view showing a case where the battery element of the thin battery of the present invention is spirally wound.

FIG. 6 is a perspective view when stacking conventional thin batteries.

FIG. 7 is a perspective view of a structure of a current collector of a conventional thin battery.

[Explanation of symbols]

 7 Positive Electrode Current Collector 8 Radiating Fin 9 Positive Electrode Terminal 10 Notched Part (Fuse) 11 Zinc Powder 12 Positive Electrode Active Material 13 Electrolyte 14, 18 Sealant 15 Negative Current Collector 16 Negative Electrode 17 A, B, C Connection Department

Claims (5)

[Claims] 1. A laminated thin battery in which thin batteries composed of a power generating element in which a positive electrode active material, an electrolyte layer and a negative electrode active material are layered are laminated, and a terminal portion is provided on an upper part of a current collector plate, To form a fuse part by providing a hole or a cut in the part, to use the terminal part as a heat radiation fin, to connect a plurality of the current collectors in the lateral direction, and to connect the connection part above the fuse part. A terminal part, holding an electrode active material and an electrolyte in the current collector, and adhering a sealing agent to the peripheral surface of the current collector, the positive electrode and the negative electrode produced respectively, the positive electrode terminal part and the negative electrode terminal Facing each other so that the parts are on top and bottom, fusing the sealing agent on the surface of each current collector, and sealing the outer surface of the current collector to wrap the entire battery to form a battery element A laminated thin battery characterized by the above. 2. A laminated thin battery in which thin batteries composed of a power generating element in which a positive electrode active material, an electrolyte layer and a negative electrode active material are layered are laminated, and a terminal portion is provided on an upper part of a current collector plate, the terminal being provided. To form a fuse part by providing a hole or a cut in the part, to use the terminal part as a heat radiation fin, to connect a plurality of the current collectors in the lateral direction, and to connect the connection part above the fuse part. The upper and lower ends of the current collector side below the terminal part and the fuse part, the electrode material and the electrolyte being held by the current collector, and a current collector including a connecting part of a plurality of current collectors connected to each other. Adhere a sealing agent to the outermost peripheral edge of the body, face each other so that the positive electrode terminal portion and the negative electrode terminal portion of the prepared positive electrode and negative electrode are up and down, and melt the sealing agent on each electrode current collector surface to each other. And a sealing agent is placed on the outer surface of the current collector. A laminated thin battery characterized in that the entire battery is wrapped to form a battery element. 3. The laminated thin battery according to claim 1, wherein the battery element is folded or spirally wound around an electric insulating material. 4. The laminated thin battery according to claim 1, wherein a hole or a cutout portion of the heat dissipation fin of the sealed laminated thin battery is used as an air passage. 5. The negative electrode heat radiation fin and the positive electrode heat radiation fin are joined with a battery connecting conductor for connecting the laminated batteries with a metal selected from zinc, tin-zinc alloy, and tin-lead alloy provided in advance in the joining portion. The laminated thin battery according to claim 1, 2, 3, or 4.