JPH1145687A - Battery label - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A battery can be coated without impairing the ease of a label coating method, and after coating, heat generated from the battery at the time of discharge can be kept warm and discharge performance can be improved. Provide labels for batteries. SOLUTION: In a label for covering the outside of a battery main body, a heat insulating layer 2 made of a porous material is formed on all or a part of a back surface of a label main material 1 which is in contact with a peripheral side surface of the battery main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating label for a battery, such as an alkaline battery, which covers the outside of the battery.

[0002]

2. Description of the Related Art In general, a battery label (hereinafter, referred to as a label) is provided with functions such as insulation between a positive electrode terminal and a negative electrode terminal, enhancement of sealing at a sealing portion, and display of an exterior. For the label, a material having heat shrinkability is often used.

The above-mentioned heat-shrinkable label is obtained by forming a layer structure on a sheet mainly made of polyvinyl chloride, polyethylene or the like by metal vapor deposition (for example, aluminum) or a metal foil, and forming the sheet on the sheet. Usually, it is adhered to the battery surface by the coated adhesive, and the actual coating method is
After adhesively coating the battery surface with a label adhesive, the battery is exposed to high temperatures, and the heat treatment of the label covers the battery end surface to fix the label.

[0004] However, in the conventional label, polyvinyl chloride or polyethylene used as a main material thereof and metal vapor deposition and metal foil forming a layer structure are materials having high thermal conductivity and easy to radiate heat. There is a problem that heat generated from the battery sometimes escapes and the performance of the battery cannot be sufficiently exhibited.

[0005]

DISCLOSURE OF THE INVENTION In view of the above-mentioned prior art, the present invention can coat a battery without impairing the easiness of a label coating method. It is an object of the present invention to provide a label for a battery that can maintain heat and improve discharge performance.

[0006]

Means for Solving the Problems The object of the present invention, which has been made to solve the above-mentioned problems, is to provide a label for a battery which covers the outside of a battery main body. A heat insulating layer made of a porous material is formed on all or a part of the portion in contact with.

[0007] The thickness of the above-mentioned heat insulating layer is desirably 0.5 mm or more. The reason for this is that if it is less than 0.5 mm, the heat retention effect is low, and if it is 0.5 mm or more, the heat retention effect becomes significant.

That is, when the battery coated with the label of the present invention is discharged, the heat of the battery generated at the time of discharging becomes difficult to escape to the outside, and the temperature of the battery increases due to the heat retaining effect, so that the discharging performance can be improved.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an extended view of an example of the label of the present invention,
FIG. 2 is a longitudinal sectional view of the label of FIG. 1, FIG. 3 is a sectional view of an example of an alkaline dry battery coated with the label of the present invention, and FIGS. 4 to 9 are tables showing the discharge performance of the alkaline dry battery coated with the label of the present invention. is there.

In FIGS. 1 and 2, reference numeral 1 denotes a heat-shrinkable label main material made of polyvinyl chloride having a metal M deposited on one side, and 2 denotes a porous material formed on the other surface of the label main material 1. A heat insulating layer made of a material, for example, foamed polyethylene, constitutes a battery label according to an example of the present invention.

FIG. 3 is a cross-sectional view of an alkaline dry battery coated with the above-mentioned label. The main body of the dry battery includes a positive electrode mixture 4, a separator 5, a negative electrode zinc gel 6, and a negative electrode current collector 7 inside a battery container 3. The label is coated on the battery body in the same manner as in the conventional method, by applying an adhesive on the heat insulating layer 2 and adhesively coating the surface of the battery body. May be exposed to a high temperature to cover and fix the battery end surface by heat shrinkage of the label main member 1, and the label covering operation can be performed extremely easily.

When the battery having the label covered and fixed to the battery body as described above is discharged, the heat generated by the battery body becomes difficult to escape to the outside due to the heat retaining effect of the heat retaining layer 2, and the battery temperature rises. And the discharge performance is improved.

Actually, in the above-described battery label, the foamed polyethylene forming the heat insulating layer 2 is formed to have a thickness of 0.1 mm.
2, 0.3, 0.5, 1.0, 2.0, 3.0mm types were prepared. These heat insulating materials were arranged at a position corresponding to the peripheral side surface of the battery of the conventional heat-shrinkable label main material 1 made of polyvinyl chloride, and were coated on the battery body of the alkaline dry battery LR6 as described above. A comparative example was a conventional label only having no heat insulating layer (thickness: 0.0 mm).

Then, the thickness of the heat insulating layer 2 is changed,
The discharge performance was evaluated for each temperature and each load current. For this reason, the temperature is set at 5 to the battery temperature before the start of discharging.
℃, 20 ℃, 35 ℃, the load current is 500mA and 1500mA, and the discharge performance is evaluated by setting the cutoff voltage to 0.90V (however, the cutoff voltage of 1500mA at low temperature 5 ℃ is 0.80V). Duration. The results of the evaluation of the discharge performance were as shown in FIGS.

That is, FIG. 4 shows that at a load current of 500 mA and a battery temperature of 5 ° C. before the start of discharging, the thickness of foamed polyethylene as a heat insulating material was changed to 0 mm, 0.2, 0.3, 0.5, 1.0, 2.0 and 3.0 mm. And the discharge duration up to a cut-off voltage of 0.90V. According to this, the discharge performance is improved as the thickness of the heat insulating layer becomes thicker than 0.5 mm, and the improved discharge performance is maintained when the thickness is 0.5 mm or more.

FIG. 5 shows that at a load current of 500 mA and a battery temperature of 20 ° C. before the start of discharging, the thickness of the heat insulating layer is changed as described above.
It is a plot of the discharge duration up to a cutoff voltage of 0.90V. The tendency is almost the same as that of FIG. 4 (low temperature 5 ° C.), but the effect is larger in FIG. That is, the discharge performance is improved as the thickness of the heat retaining layer is increased to less than 0.5 mm, and the improved discharge performance is maintained when the thickness is 0.5 mm or more.

FIG. 6 shows a case where the battery temperature before the start of discharge in FIGS. 4 and 5 was 35 ° C. Even if the thickness of the heat retaining layer was changed, there was almost no effect on the discharge performance.

FIGS. 7, 8, and 9 show that the load current is 1500 mA,
Assuming that the battery temperature before starting discharge was 5 ° C., 20 ° C., and 35 ° C., the thickness of the heat retaining layer was changed in the same manner as described above, and the final voltage was 0.90 V (FIG. 7).
Only plots the discharge duration up to 0.80 V).

In the case of FIG. 7, the tendency is substantially the same as in FIGS. 4 and 5, the discharge performance is improved as the thickness of the heat insulating layer is increased to less than 0.5 mm, and the improved discharge performance is maintained when the thickness is 0.5 mm or more. You.

In the case of FIG. 8, the tendency is substantially the same as in FIGS. 3, 5, and 7. The effect is greater in Fig. 7 and the thickness of the heat insulating layer is
The discharge performance improves as the thickness increases to less than 0.5 mm,
Above, the improved discharge performance is maintained.

In the case of FIG. 9, the effect is smaller than that of FIGS. 7 and 8, but the effect of the heat insulating layer is remarkable even at 35 ° C.

[0022]

The present invention is as described above, and a heat insulating layer made of a porous material is formed on all or a part of the back surface of the label main material that contacts the peripheral side surface of the battery body. If the battery is fixed to the battery body, the battery can be kept warm during discharging, so that the discharging performance of the battery can be improved.
In addition, the work of coating the battery body is very easy as in the conventional case.

Further, when the thickness of the heat insulating layer is 0.5 mm or more, the duration of discharge is prolonged, and the effect is large. Therefore, it is considered that the better the heat insulation performance of the heat insulation layer, the greater the effect. Further, as the battery temperature before the start of discharging is lower and the load current is higher, the effect is more remarkable.

[Brief description of the drawings]

FIG. 1 is an extended view of an example of the label of the present invention.

FIG. 2 is a longitudinal sectional view of the label of FIG.

FIG. 3 is a cross-sectional view of an example of an alkaline dry battery coated with the label of the present invention.

Fig. 4 Load current 500mA, temperature 5 ° C, discharge end voltage 0.90V
4 is a table showing the relationship between the thickness of the heat retaining layer and the duration of discharge when the following conditions are satisfied.

FIG. 5 is a chart showing the relationship between the thickness of the heat retaining layer and the discharge duration when the temperature in FIG. 4 is set to 20 ° C.

FIG. 6 is a chart showing the relationship between the thickness of the heat retaining layer and the discharge duration when the temperature in FIG. 4 is 35 ° C.

FIG. 7: 1500 mA load current, 5 ° C. temperature, discharge termination voltage 0.80
4 is a chart showing the relationship between the thickness of the heat retaining layer and the discharge duration when V is set.

8 is the temperature in FIG. 7 at 20 ° C., and the discharge end voltage is 0.90 V.
4 is a table showing the relationship between the thickness of the heat retaining layer and the duration of discharge when the following conditions are satisfied.

9 is a table showing the relationship between the thickness of the heat retaining layer and the discharge duration when the temperature in FIG. 8 is 35 ° C.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 label main material 2 heat insulating layer 3 battery container 4 positive electrode mixture 5 separator 6 negative electrode zinc gel 7 negative electrode current collector

Claims (3)

[Claims] 1. A label for covering the outside of a battery main body, wherein a heat insulating layer made of a porous material is formed on all or a part of a portion of the back surface of the label main material that contacts the peripheral side surface of the battery main body. Battery label. 2. The battery label according to claim 1, wherein the heat insulating layer has a thickness of 0.5 mm or more. 3. The battery label according to claim 1, wherein the main label material has heat shrinkability.