JPH0617110U - Thin sealed storage battery - Google Patents

Abstract

(57) [Summary] [Purpose] To lower the valve opening pressure. [Structure] An electrode plate group 7 is housed in a battery case 1 formed by joining two synthetic resin bodies 2 together by heat welding. The pressure release through hole 8 is formed in one of the synthetic resin bodies. A partial joint portion 9 for partially joining the two synthetic resin bodies 2 is formed between the pressure releasing through hole 8 and the electrode plate group 7. The partial joint 9 is composed of a plurality of unit joints 9a to 9d. Then, of the lengths b to d of the non-bonding portions between the unit bonding portions and the lengths a and e of the non-bonding portions between the peripheral bonding portion 3 and the unit bonding portions 9a and 9d adjacent to the peripheral bonding portion, The length c of the non-bonded portion closest to the pressure releasing through hole 8 is made longer than the length of the other non-bonded portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thin sealed storage battery called a so-called film pack storage battery, and more particularly to improvement of a pressure relief valve structure thereof.

[0002]

[Prior art]

 In the conventional film pack type storage battery disclosed in Japanese Unexamined Patent Publication No. 63-174265, an electrode plate group is arranged between two film-shaped or sheet-shaped synthetic resin bodies and the circumference is joined to By providing a pressure relief through hole in one of the synthetic resin bodies and discontinuously joining the periphery of the pressure relief through hole with the other synthetic resin body to form a partial joint consisting of multiple unit joints. It constitutes a pressure relief valve structure. In order to maintain good airtightness, silicone oil may be placed around the small holes.

[0003]

[Problems to be solved by the device]

 In the conventional structure, the contact part between the two synthetic resin bodies located near the partial joint between the synthetic resin bodies opens when the internal pressure of the battery rises, and the valve opens, and the internal pressure is It will be closed if the pressure is equal to or less than the pressure. In the conventional structure, such bending of the synthetic resin body due to repeated opening and closing of the valve is prevented as much as possible by making the partial joint part a discontinuous joint part composed of a plurality of discontinuous unit joint parts. It was improving reliability. In this case, the two synthetic resin bodies are separated from each other at the non-joint portion between the unit joint portions forming the discontinuous joint portion or the non-joint portion between the discontinuous joint portion and the peripheral joint portion due to the increase in the internal pressure. Be in shape. At this time, as the length of the non-bonded portion becomes longer, the synthetic resin body separates earlier than the other non-bonded portion in that portion, so that the synthetic resin body of the other non-bonded portion is pulled. It becomes difficult to separate. Therefore, depending on the position of the unit joint part, the synthetic resin body in the part where the pressure release through hole that is the exhaust hole is difficult to separate, the valve opening pressure becomes high, and the battery swells or bursts. The problem occurs.

An object of the present invention is to provide a thin sealed storage battery that can reduce the valve opening pressure.

[0005]

[Means for Solving the Problems]

 In the present invention, the electrode plate group is housed in a battery case formed by joining two film-like or sheet-like synthetic resin bodies by heat welding around each other. At least one pressure-release through hole is formed, and a partial joint that partially joins the two synthetic resin bodies between the pressure-release through hole and the electrode plate group is not continuous with the peripheral joint of the battery case. A thin sealed storage battery in which a pressure relief valve structure is formed by forming a battery is targeted for improvement. In the present invention, the partial joint is composed of a plurality of unit joints formed at predetermined intervals, and the length of the non-joint portion between the unit joints and the peripheral joint and the peripheral joint are adjacent to each other. Among the lengths of the non-bonding portion between the unit bonding portion, the length of the non-bonding portion closest to the pressure release through hole is made longer than the length of other non-bonding portions. Even if the length of the non-joint part closest to the pressure relief through-hole is increased, it is possible to obtain valve opening pressure that is sufficient to maintain the function as a safety valve or pressure relief valve. It is longer than the length of the non-bonded part of. Also, when airtightness improving oil such as silicone oil is placed around the pressure relief through-hole, the free movement of oil to the electrode plate group side is suppressed when determining the length of each non-contact part. Of course, it is necessary to determine the length of each non-bonded portion so that it can be obtained.

[0006]

[Action]

 As described above, if the length of the non-bonded portion closest to the pressure release through hole is made longer than the length of the other non-bonded portion, when the internal pressure rises, the part with the pressure release through hole increases. Since the synthetic resin body is most easily separated, the valve is opened at a low pressure. Therefore, it is possible to prevent the problem that the battery case swells or bursts as in the conventional case.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic partial plan view of an embodiment in which the present invention is applied to a thin sealed lead acid battery. In this figure, reference numeral 1 denotes a battery case, and the battery case 1 is constructed by joining the circumferences of two film-like or sheet-like synthetic resin bodies 2 and 2 by heat welding to form a peripheral joining portion 3. ing. In this figure, the two synthetic resin bodies 2 and 2 are drawn as transparent, and the peripheral joint portion 3 is shaded for easy understanding. Inside the battery case 1, an electrode plate group 7 formed by laminating an anode plate 4 and a cathode plate 5 via a retainer 6 is housed. The output terminal portions 4a and 5a of the electrode plate group 7 project from the peripheral joint portion 3. The front synthetic resin body 2 is formed with a pressure release through hole 8 in a portion away from the electrode plate group 7. Further, the pressure release through hole 8 and the electrode are not continuous with the peripheral joint portion 3 of the battery case 1. A partial joint portion 9 that partially joins the two synthetic resin bodies 2 and 2 is formed between the plate group 7 and the plate group 7 to form a pressure relief valve structure.

[0008] The partial joints 9 are composed of unit joints 9a to 9d which are formed so as not to be continuous with each other. The unit joints 9a to 9d are formed so as to form a linear row along the side where the terminals of the battery case 1 or the electrode plate group 7 are output, and the partial connection part 9 and the periphery of the battery case 1 are formed. Silicone oil (airtightness improving oil) 10 is filled in a region surrounded by the joint portion 3 in order to improve airtightness during depressurization. This silicone oil is not essential. When the internal pressure of the battery rises above a certain level, the two synthetic resin bodies 2 and 2 between the unit junctions separate and open the valve, and when the internal pressure is equal to or lower than the external pressure, the two synthetic resin bodies in this region The synthetic resin bodies 2 and 2 come into close contact and close the valve.

In the figure, a to e are the lengths of the non-bonding portions between the respective unit bonding portions 9a to 9d and the lengths of the non-bonding portions between the unitary bonding portions 9a and 9d and the peripheral bonding portion 3. Shows. In this embodiment, the length c of the non-joint portion (the portion between the unit joint portions 9b and 9c) closest to the pressure releasing through hole 8 is set to the lengths a and b of the other non-joint portions. , D, e are longer. With such a size configuration, the valve opening pressure can be lowered. In order to confirm this, the valve opening pressure was measured when the length of each non-bonded portion was changed. Table 1 shows the result. The lengths a to e of the non-bonded portions are changed within a range in which the filled silicone oil 10 does not easily move to the electrode plate group 7 side.

[0010]

[Table 1] From the above results, when the length c of the non-joint portion closest to the pressure release through hole 8 is set to be the longest, the valve opening pressure shows a stable low value regardless of the length of the other non-joint portion. It can be seen that the valve opening pressure increases when the lengths a, b, d, e of the other non-joined portions are longer than the length c of the non-joined portions.

In the above-described embodiment, the plurality of unit joint portions 9a to 9d are arranged linearly to form the partial joint portion 9. However, the shape of the partial joint portion is not limited to the embodiment, and, for example, A plurality of unit joints may be formed so as to surround the pressure release through hole 8. Even in that case, the length of the non-bonded portion, which is closest to the pressure-release through hole 8 among the non-bonded portions formed between the unit bonded portions, may be made longer than the length of the other non-bonded portions.

[0012]

[Effect of device]

 According to the present invention, by making the length of the non-bonding portion closest to the pressure releasing through hole longer than the length of the other non-bonding portion, the presence of the pressure releasing through hole when the internal pressure rises. The valve opening pressure can be lowered because the synthetic resin body in the portion where the valve is opened is most easily separated. Therefore, according to the present invention, it is possible to prevent the problem of the battery case swelling or bursting as in the conventional case, and it is possible to obtain a highly reliable pressure relief valve structure.

[Submission date] July 31, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

[Effect of device]

According to the present invention, by longer than the length of the unbonded portion of the length of the other non-bonded portion positioned closest to discharge pressure through hole, when the internal pressure rises, the discharge pressure through hole standing The valve opening pressure can be lowered because the synthetic resin body in the portion where the valve is opened is most easily separated. According to the present invention therefore, as in the prior art, it is possible to prevent the occurrence of a problem that the container resulting in blistering or, or bursting, it is possible to obtain a high relief valve structural reliability.

[Brief description of drawings]

FIG. 1 is a schematic partial plan view of an embodiment in which the present invention is applied to a thin sealed lead-acid battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery case 2 Film-like or sheet-like synthetic resin body 3 Surrounding joint part 4 Anode plate 5 Cathode plate 6 Retainer 7 Electrode plate group 8 Through hole for pressure release 9 Partial joint part 9a-9d Unit joint part 10 Silicone oil

Claims (1)

[Scope of utility model registration request] 1. An electrode plate group is housed in a battery case in which the periphery of two film-like or sheet-like synthetic resin bodies are joined by heat welding, and at least one of the two synthetic resin bodies is provided. A portion where one pressure-releasing through hole is formed and which partially joins the two synthetic resin bodies between the pressure-releasing through hole and the electrode plate group without being continuous with the peripheral joint portion of the battery case. A thin sealed storage battery in which a joint portion is formed to form a pressure relief valve structure, wherein the partial joint portion is composed of a plurality of unit joint portions formed at predetermined intervals, and between the unit joint portions. Of the length of the non-bonding portion and the length of the non-bonding portion between the peripheral bonding portion and the unit bonding portion adjacent to the peripheral bonding portion, the non-bonding portion at a position closest to the pressure-release through hole. Thin type characterized in that the length of the part is longer than the length of other non-bonded parts Closed-form battery.