JP3374555B2 - Battery with terminal - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power source containing a power generating element.
Electric terminals with terminals in which the terminal pieces are welded to the pond can and the terminal board, respectively .
It relates to the pond.

2. Description of the Related Art Generally, primary and secondary batteries such as coin-shaped, button-shaped, and cylindrical lithium and alkali are often used as a power source for memory backup of electronic devices and the like, and soldered to this type of battery. A terminal having a solder layer provided in advance on a portion was mounted by a method such as resistance welding or laser welding (YAG laser, excimer laser, carbon dioxide laser welding) or the like, and was directly soldered to the circuit board .

Such a battery with a terminal is usually constructed by hermetically sealing a battery can, which also functions as one terminal accommodating a power generation element, and a terminal plate, which also functions as the other terminal, via an insulating packing. A general-purpose polyethylene resin, polypropylene resin, or polyamide resin was used as the material. Further, those obtained by adding inorganic additives such as glass fiber, ceramics and mica to these resins have also been used.

[0004]

[SUMMARY OF THE INVENTION However, as the work of solid <br/> deposited on a wiring board terminals with batteries, such as the by soldering, to shorten the work hours, infrared reflow soldering There has been an attempt to adopt the soldering method or the VPS soldering method (vapor condensation soldering method). In this case, the infrared reflow soldering method has a higher set temperature than the other soldering methods, and the member is required to have high heat resistance.
This is because, usually, after preheating for 40 to 60 seconds in a temperature atmosphere of 120 to 150 ° C., it is performed for 10 seconds in a temperature atmosphere of 230 to 240 ° C. or 30 seconds in a temperature atmosphere of 200 ° C. The VPS soldering method, after pre-heating 40 to 60 seconds at a temperature atmosphere of 120 to 150 ° C., are treated at 30 seconds inert liquid saturated steam at a temperature atmosphere of 215 ° C..
For this reason, when the resin material forming the gasket of the battery with terminals is the above-mentioned general-purpose resin alone or the resin containing an inorganic additive, it is exposed to such a high temperature atmosphere.
In Rukoto, shrinkage or surface cracks by sudden temperature change, a phenomenon of deformation, no longer functions as an insulating packing, and sealing property is significantly reduced in the batteries, the electrolyte
It becomes a factor that causes problems such as leakage. Also,
If the resin stays in the soldering process for a long time, the resin itself may melt, which may affect the battery characteristics.
The impact of this is not negligible.

The present invention solves the above problems, and by using a resin material having excellent heat resistance and electrolytic solution resistance, a battery with a terminal applicable to the infrared reflow soldering treatment method and the VPS soldering treatment method, That is, the processing as described above
It is an object of the present invention to provide a terminal-equipped battery having heat resistance capable of achieving the above.

[0006]

In order to solve the above problems, a battery with a terminal according to the present invention is a battery that also serves as one terminal.
The terminal plate that also functions as a can and the other terminal
Positive and negative on the surface of the battery that is sealed and contains the power generation element
A battery which is fixed pole terminal strip, respectively, before Symbol insulation
Resin material whose packing has a melting temperature of 240 ℃ or higher
(Excluding polyamide resins) Tona characterized Rukoto. As the resin material for the insulating packing, polyphenylene sulfide resin having a melting temperature of 240 ° C. or higher, polyether ketone resin, polyether ether ketone resin, polyethylene terephthalate resin, polyarylate resin, polybutylene terephthalate resin, polycyclohexane dimethylene terephthalate resin. At least one resin selected from is preferable.

[0007]

According to the present invention, by using a specific resin material insulating <br/> packing grayed battery, infrared reflow soldering process, a few minutes to a high temperature atmosphere of 200 ° C. or higher at the time with VPS soldering process Even if exposed, the function of insulation packing can be prevented from lowering , liquid leakage can be suppressed, and the process time of soldering process can be greatly shortened, resulting in reduction of product manufacturing cost. .

[0008]

EXAMPLE A coin type lithium fluorinated graphite battery with terminals shown in FIG. 1 will be described below as a battery showing an example of the present invention.

In FIG. 1, reference numeral 1 denotes a battery can or battery case made of stainless steel, and inside this, a positive electrode plate 2 containing fluorinated graphite as a main component and a negative electrode plate 3 containing metallic lithium as an active material are provided. The power generation element is a film-like separator 4
Built in by stacking through. Then, a metal terminal plate, that is, a sealing plate 5, is provided on its peripheral portion with a resin material having a melting temperature of 240 ° C. or more excellent in heat resistance and non-aqueous electrolyte solution resistance according to the present invention, specifically (A). Polyphenylene sulfide resin, (B) Polyetherketone resin, (C) Polyetheretherketone resin, (D) Polyethylene terephthalate resin, (E) Polybutylene terephthalate resin, (F) Polyarylate resin, (G) Polycyclohexanedimethylene An insulating packing 6 made of terephthalate resin is attached, and the one fitted into the upper opening 1a of the battery can 1 is bent inward by a mold to seal the opening of the battery can 1. As the electrolytic solution, a non-aqueous electrolytic solution prepared by dissolving lithium borofluoride as a solute in a concentration of 1 mol / 1 in a non-aqueous solvent composed of γ-butyrolactone is used. A Lewis base type organic solvent such as γ-butyrolactone is usually used as a solvent for this type of battery. 1b is a terminal piece fixed to the surface of the battery can 1 by laser welding or resistance welding, and usually has a thickness of 0.1 to 0.1.
It is composed of 0.5 m / m stainless steel. 5a is 1
Similarly, it is fixed to the surface of the terminal plate 5 with a terminal piece similar to b. Further, the soldering portions of the terminal pieces 1b and 5a have a solder layer formed in advance by solder plating.

Next, in order to compare the dimensional stability of a gasket composed of the above resins (A) to (G) of the present invention and a polypropylene resin (M) which is a conventional resin, in order to compare the dimensional stability, 150
It was left for 200 hours in an atmosphere of ° C, and then left at room temperature for 24 hours to be subjected to heat stress. As a result, the gasket used for the non-aqueous electrolyte battery of this example had a dimensional change rate (shrinkage rate) of 0.01% or less before and after heat stress was applied, whereas the conventional gasket had a dimensional change rate of 0.83%. It is clear that the gasket of the present invention has extremely high dimensional stability under high temperature storage.

Next, in order to confirm the effect of the gasket of this embodiment, the gaskets (A) to (G) described above,
Lithium battery BR3032 with coin terminal using a conventional gasket made of polypropylene resin (M) and a gasket made of polypropylene resin (N) with 10% by weight of glass fiber added to improve heat resistance
500 were prepared for each. 4 in 150 ℃ atmosphere
After being stored for a day, it was taken out and evaluated for the characteristics, that is, the open circuit voltage, the internal resistance, the battery weight reduction amount due to the scattering of the electrolytic solution, and the capacity ratio at the time of discharging with a load resistance of 20 kΩ. The results are shown in Table 1.

[0012]

[Table 1]

As is clear from Table 1, no significant characteristic difference is observed in the open circuit voltage, but in the transition of the internal resistance, the initial value of 12Ω was 254Ω and 247Ω in the conventional configurations (M) and (N), respectively. Was rising to. Further, although the battery weight reduction is small in the present invention, the battery weight reduction is remarkable in the conventional configuration. Regarding the discharge characteristics, the conventional configurations (M) and (N) deteriorated to 24 and 27, respectively, when the initial discharge capacity was set to 100, but in the case of the present invention, the degree of deterioration is low and it is sufficiently practical. It was profitable.

Next, the batteries (A) to (G) of the present invention and the conventional batteries (M) and (N) were attached to a circuit board, an infrared reflow process was performed to perform a soldering process, and immediately after that. The number of battery leaks and the thermal stress of storing in an atmosphere of 80 ° C. for 12 hours and −40 ° C. for 12 hours in one atmosphere after the treatment is 5
Table 2 shows the number of battery leaks after 0 cycles were applied. The number of samples was 50 for each.

[0015]

[Table 2]

As is clear from Table 2, in the case of the battery of the present invention, liquid leakage hardly occurred even after 50 cycles.
In the case of the conventional batteries, there was leakage immediately after, and after 50 cycles, all the batteries leaked.

[0017] As described above, the terminal with batteries using resin material in the present invention, as compared to that using conventional resin material, has been found to be excellent extremely heat resistance, resistance to sealability . The reason for limiting the materials for the insulating packing of the battery to the materials (A) to (G) is that this type of material is excellent in the resistance to organic electrolytic solution.
This is because the material (L) has a slightly poor resistance to organic solvents and cannot maintain the function of the insulating packing of the battery for a long period of time . Also, (A) were subjected to single material in the above experiment ~ (L), also be a mixture of this material, or glass fibers in amount of more than about 10 wt% to the material, mica whiskers, ceramic Experiments have shown that even if fine powder or the like is added, the same effect as this experiment is exhibited. Although an organic electrolyte battery is shown as the battery in the above embodiment, in the case of an alkaline battery formed by using an alkaline aqueous solution of an electrolytic solution, a polyamide bismaleimide resin, a polyamideimide resin, or a polyamide 46 resin can be sufficiently used. Is.

[0018]

As is apparent from the foregoing description, one using an insulating packing grayed in the present invention shows a strong heat resistance to heat stress during solder reflow, the dimensions of the insulating packing causes shrinkage in cell Therefore, it is possible to sufficiently maintain the initial airtightness of the sealing portion .

[Brief description of drawings]

FIG. 1 is a sectional view of a battery with a terminal according to an embodiment of the present invention.

[Explanation of symbols]

1 battery can 1a opening 1b Terminal piece 2 positive electrode 3 separator 4 Negative electrode 5 terminal board 5a Terminal piece 6 Insulating packing

Claims (2)

(57) [Claims] And 1. A one battery can serving also as a terminal, and a terminal plate serving also as the other terminal is sealed with an insulating packing, the battery can the terminal pieces of positive and negative electrodes on the surface of the cell formed by accommodating the power generation element And a battery with terminals fixed to the terminal board ,
A battery with a terminal, wherein the insulating packing is made of a resin material (excluding a polyamide resin) having a melting temperature of 240 ° C. or higher. 2. The insulating packing is at least one resin selected from polyphenylene sulfide resin, polyether ether ketone resin, polyether resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyarylate resin and polycyclohexanedimethylene terephthalate resin. The battery with a terminal according to claim 1, comprising: