JPS62150649A - Enclosed type lead storage battery - Google Patents

Abstract

PURPOSE:To improve the service life property, reliability, and safety of an enclosed type lead storage battery, by composing it to prevent the direct transmission of the increased temperature of the component units of such a battery to the armoring case at the final stage of charging, and to release the heat generated inside such a storage battery. CONSTITUTION:A group of electrode plate sets consisting of an anode plate, a cathode plate, both of which have an electrode pole 4 welded, and a separator impregnated with an electrolyte of a level of amount not diposited, are held between sheet-form or foil-form synthetic resin bodies with heat-proof and heat-diposition properties. Enclosed type lead storage battery component units 1, a part of which is remained undiposited to form a safety valve role 5, the other portion surrounding the safety valve portion being heat-diposited and enclosed, are stored in an armoring case 3. In this time, as well as adiabatic and elastic synthetic resin bodies 6 are placed between the armoring case 3 and the component units 1, metal plates or metallic foils 7 are placed between the opposing electrode plates of the enclosed type lead storage battery component units 1. Furthermore, the ends of the metal plates or metallic foils 7 are arranged to position just at the centers of slits 8 furnished at the side of the armoring case 3.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to improvements in sealed lead-acid batteries.

(Conventional technology) Constant voltage charging has been the mainstream method for charging lead-acid batteries in the past, but constant voltage charging using high current is preferred because it enables rapid charging, reduces the cost of chargers, and is more versatile. A current charging method is being considered.6 The constant current charging method uses a negative electrode plate that absorbs oxygen gas generated from the positive electrode plate at the end of charging by making the amount of active material in the negative electrode plate larger than that of the positive electrode plate. This is a charging method that completes charging by detecting the drop in battery voltage of a sealed lead-acid battery due to the heat generated.

A conventional sealed lead acid battery will be explained with reference to FIG.

FIG. 2 shows a schematic external perspective view of a conventional sealed lead-acid battery. The heat generated in the sealed lead-acid battery component 1 at the end of charging is either transferred directly to the outer case 3 through the ribs 2, or Accumulated inside the lead-acid battery.

(Problems to be Solved by the Invention) When the conventional sealed lead-acid battery is charged with a current of IOA or higher, the temperature of the sealed lead-acid battery increases at the end of charging, causing the positive electrode plate and negative electrode plate to rise. Corrosion of the pole poles welded to the battery is accelerated, and the safety valve is deformed due to heat, the airtightness of the sealed lead-acid battery structure itself is broken, and the life characteristics of the sealed lead-acid battery are reduced. was there. Furthermore, there are also problems regarding the safety of devices and users using the sealed lead-acid batteries.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an electrode group consisting of a positive electrode plate, a negative electrode plate, and a separator, which has acid resistance and heat weldability in the form of a sheet or film. At least two single sealed lead-acid batteries are sandwiched between synthetic resin bodies and sealed by heat welding, leaving some unwelded parts to serve as safety valves.
By overlapping the cells and fixing them inside the outer case with a synthetic resin body having insulation and elasticity interposed between the polar plate surface of the single sealed lead-acid battery and the inner wall surface of the outer case, In addition to preventing a rise in battery temperature from being directly conducted to the exterior case, a metal plate or metal foil is sandwiched between the surfaces of the single sealed lead-acid battery where the electrode plates contact each other, thereby increasing the temperature of the exterior case. The present invention provides a sealed lead-acid battery in which heat inside the battery is radiated through a provided slit.

(Function) According to the sealed lead-acid battery having the above configuration, it is possible to prevent the temperature rise of the sealed lead-acid battery at the end of charging from being directly conducted to the outer case, and also to prevent the temperature rise generated inside the sealed lead-acid battery from being conducted directly to the outer case. This makes it possible to efficiently dissipate heat after heating.

(Example) An example of the sealed lead-acid battery of the present invention will be described with reference to FIG. FIG. 1 shows a cutaway perspective view of a sealed lead-acid battery according to the present invention. An electrode plate group consisting of a positive electrode plate to which the pole pillar 4 is welded, a negative electrode plate, and a separator impregnated with an amount of electrolyte that does not separate is made of a sheet-like or film-like synthetic resin body having heat resistance and heat-weldability. Sealed lead-acid battery configuration in which the periphery is heat-welded and sealed, leaving a part of the unwelded part to form a safety valve 5 When storing the unit 1 in the exterior case 3, the exterior case 3 and the sealed lead-acid battery configuration A synthetic resin body 6 having heat insulating properties and elasticity is interposed between the single body 1, and
A metal plate or metal foil 7 is sandwiched between the surfaces of the sealed lead-acid battery unit 1 where the electrode plates face each other. Further, the end surface of the metal plate or metal foil 7 is arranged so as to be located at the center of a slit 8 provided on the side surface of the exterior case 3.

When using a synthetic resin body 6 having heat insulating properties and elasticity, a synthetic resin body in which a metal such as aluminum is vapor-deposited on a foam and a synthetic resin film is coated on the vapor-deposited surface.
The metal plate or metal foil 7 may be made of any material and thickness, but it may be made of a material with good thermal conductivity and lightweight, such as aluminum, etc. is desirable. The position and width of the slit 8 provided in the exterior case 3 may be arbitrary, but in order to improve heat dissipation efficiency, it is desirable to increase the surface area within a range that does not cause any problems in terms of design.

Due to the above configuration, in the conventional sealed lead-acid battery, the surface temperature of the outer case 3 rose to 65°C and the internal temperature rose to 7-0°C to 80°C, but in the sealed lead-acid battery of the present invention, the internal temperature rises to 65°C. The temperature could be lowered to about 50°C. Furthermore, the reliability of the pole pillar 4 and the safety valve 5 is improved,
The life characteristics up to the initial capacity of 172 are different from that of the conventional 20.
Compared to 0 cycles, the present invention achieved a remarkable improvement of 400 cycles or more.

(Effects of the Invention) As described above, according to the present invention, heat generated from a single sealed lead-acid battery at the end of rapid constant current charging can be efficiently dissipated, so that the life characteristics of the sealed lead-acid battery are improved. , reliability and safety are improved, and application to various electrical devices requiring rapid charging becomes possible.

[Brief explanation of drawings]

FIG. 1 is a cutaway perspective view of a sealed lead-acid battery according to the present invention, and FIG. 2 is a schematic external perspective view of a conventional sealed lead-acid battery. 1...Single sealed lead-acid battery configuration, 2...Rib,
3...Exterior case, 4...Pole pillar, 5...
Safety valve, 6...Synthetic resin body having heat insulation and elasticity,
7...Metal plate or metal foil, 8...Slit. Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1

Claims (3)

[Claims] (1) Synthesis of an electrode plate group consisting of a positive electrode plate with welded pole columns, a negative electrode plate, and a separator impregnated with an amount of electrolyte that does not separate, into a sheet or film form that has acid resistance and heat weldability. When a single sealed lead-acid battery is sandwiched between resin bodies and sealed by heat welding, leaving some unwelded parts to serve as a safety valve, when stacking at least two or more cells and storing them in an exterior case, the sealing A synthetic resin body having heat insulating properties and elasticity is interposed between the electrode plate surface of the single sealed lead-acid battery structure and the inner wall surface of the outer case, and a metal plate is interposed between the opposite surfaces of the electrode plates of the sealed lead-acid battery structure single piece. Alternatively, a metal foil is sandwiched, and slits are provided in a part of the outer case at positions facing both ends of the metal plate or metal foil,
A sealed lead-acid battery, characterized in that an end face of the metal plate or metal foil is positioned opposite to the slit. (2) The sealed lead-acid battery according to claim (1), wherein the synthetic resin body having heat insulating properties and elasticity is a foam body. (3) The sealed lead-acid battery according to claim (1), wherein a synthetic resin film is coated on the vapor-deposited surface of the synthetic resin foam on which metal such as aluminum is vapor-deposited.