TWI645597B - Thermal battery protection device - Google Patents

Abstract

A thermal battery protection device is disposed on a thermal battery having an end cover, a casing, and an electrode stack. The thermal battery protection device includes: one or more end cap rings disposed on the inner side of the outer casing, under the end cover and the electrode Above the stack, the end cap ring, the end cap and the electrode stack together define an internal space; a thermosetting resin is disposed in the internal space, thereby utilizing the thermal battery protection device to raise the end cap of the thermal battery Resistance to deformation.

Description

Thermal battery protection device

The present invention relates to a thermal battery protection device, and more particularly to a thermal battery protection device that resists heat battery deformation.

A conventional heat battery is a pre-storage battery that activates heat activation. When stored, the electrolyte is a non-conductive solid. When used, the active chain and the hot sheet are ignited by a power source or an impact to melt the electrolyte into a conductive ion conductor. Activated, the battery operating temperature is 400-600 ° C; the thermal battery activation chain is composed of the excitation element and the ignition element, the electrolyte is usually a mixture of potassium chloride-lithium chloride eutectic salt or lithium halide, the anode activity The material is mostly lithium-based metal alloy, and the positive electrode active material is used as an electrochemical system for metal sulfide or oxide mainly composed of vanadium, iron, cobalt and nickel. The hot plate is a heat source inside the heat battery, and is mixed with iron powder and potassium perchlorate. And got it.

Because of its high power output characteristics, the thermal battery is mostly used as a power source for missiles (US4675257, US5382479, US7354678), for the purpose of 30 years of service life, high pressure due to thermal decomposition during operation, high environmental stress resistance, etc. The metal terminal is sealed by a metal container; the metal terminal on the end cap of the thermal battery is made by a glass sealing technology, and is mainly used as a path for external power supply and working power output when the heat battery is activated, which is thermally activated and activated by the power source. structure.

At the beginning of the activation of the heat battery, the temperature generated by the instantaneous operation of the excitation element, the ignition element, the hot piece, etc., can be as high as a thousand degrees, and the thermal shock to the surrounding components is quite serious, especially on the end cap. Glass; the metal terminal on the end of the heat battery as the power transmission path, the glass is isolated from the metal end cover, the sealing technology used to ensure electrical insulation, the combination of glass and metal, the strength The relatively homogeneous combination is weak, this interface is the only weakness of the thermal battery; how to protect against the impact of thermal shock, most of them are blocked by asbestos (US3625767, CN202487704), fiberglass (US3864170) or other insulation materials Protection (US Pat. No. 3,039,888, US Pat. No. 4,041,217, US Pat. No. 4,119,769, US Pat. No. 4,383,014, US Pat. No. 4,840,859, US Pat. No. 5,770,329, US Pat.

The operating temperature of the thermal battery must be maintained above 400 ° C in order to maintain the molten state of the electrolyte to ensure that the electrochemical reaction can proceed. Some of the raw materials inside the thermal battery, such as the iron disulfide of the cathode material, have an onset temperature of thermal cracking. 400 ° C, and the product of thermal cracking is a sulfur gas, which increases with increasing temperature, is the main source of pressure inside the battery. The bottom or end cap of the battery may protrude outward, and more, the battery end cap Excessive deformation will cause the glass to rupture or fall off; if the electrical load increases abnormally, the electrochemical reaction rate will increase, the exothermic reaction will cause the battery temperature to rise, accelerate the thermal cracking of the iron disulfide, and the pressure inside the battery will increase rapidly, eventually leading to The glass breaks or falls off.

Therefore, the industry needs to develop a thermal battery protection device that can be affected by The axial combined pressure buffers the stress of the end cap and the electrode stack, and can withstand the heat of the battery and the end cap during sealing and the temperature and pressure of the battery during operation, thereby improving the resistance of the thermal battery end cap.

In view of the above disadvantages of the prior art, the main object of the present invention is to provide a thermal battery protection device that integrates more than one end cap ring and a thermosetting resin, and the end cap ring and the thermosetting resin are disposed in the heat. Inside the battery, the thermal battery protection device can withstand the axial combined pressure to buffer the stress of the end cap and the electrode stack, and can withstand the gas heat during the sealing of the battery and the end cap, as well as the temperature and pressure during operation of the battery, thereby improving Thermal battery end caps are resistant to deformation.

In order to achieve the above object, according to one aspect of the present invention, a thermal battery protection device is provided, which is disposed on a thermal battery having an end cover, a casing, and an electrode stack, and the thermal battery protection device includes: one or more end cap rings. The inner cover is disposed under the end cover and above the electrode stack. The end cover ring, the end cover and the electrode stack together define an internal space; a thermosetting resin is disposed in the inner space.

The thermal battery protection device of the present invention, wherein the end cap ring can be composed of a laminated fiber cloth and a resin, and the material of the laminated fiber cloth can be composed of glass fiber, carbon fiber, cotton fiber, wood fiber and artificial petrochemical fiber. In the group, the resin may be made of epoxy resin, phenolic resin or enamel resin.

The thermal battery protection device of the present invention, wherein the end cap ring can be composed of a layer of mica paper and a resin, and the material of the laminated mica paper can be selected from the group consisting of phlogopite and muscovite, and the material of the resin can be It is an epoxy resin, a phenolic resin or a enamel resin.

The thermal battery protection device of the present invention, wherein the thermal battery protection device further comprises a ceramic powder added to the thermosetting resin, wherein the ceramic powder is made of magnesium oxide, calcium oxide, aluminum oxide or cerium oxide. A group consisting of zirconia, boron nitride, and tantalum carbide, the ceramic powder having a particle size ranging from 0.1 to 20 μm.

In the thermal battery protection device of the present invention, the thermosetting resin may be made of epoxy resin, phenolic resin or enamel resin.

The above summary and the following detailed description and drawings are intended to further illustrate the manner, means and effects of the present invention in achieving its intended purpose. Other purposes and advantages of this creation will be explained in the following description and drawings.

110‧‧‧End cap group

120‧‧‧Excitation element

130‧‧‧ ignition components

140‧‧‧Unit level

150‧‧‧electrode stack

160‧‧‧Shell

200‧‧‧End cap group

210‧‧‧ terminals

220‧‧‧glass components

230‧‧‧End cover

240‧‧‧End cap ring

250‧‧‧Hot-setting resin

260‧‧‧Excitation element

The first figure is a schematic structural view of a conventional heat battery; the second figure is an embodiment of the heat battery protection device of the present invention.

The embodiments of the present invention are described by way of specific examples, and those skilled in the art can readily understand the advantages and effects of the present invention from the disclosure of the present disclosure.

Please refer to the first figure, which is a schematic structural diagram of a conventional heat battery. As shown in the figure, a conventional heat battery includes a casing (160), an end cap group (110), an excitation element (120), and an introduction. a igniting element (130), a unit group (140) and an electrode stack (150), and the end cap group (110) covers the outer casing (160) and defines an internal space together with the outer casing (160), the interior The excitation element (120), the ignition element (130), the unit group (140) and the electrode stack (150) are disposed in a space such that the end cap group (110) and the outer casing (160) can seal the excitation element (120), the ignition element (130), the unit group (140), and the electrode stack (150) and the like, wherein the end cap group conventionally comprises two terminals, two glass elements, and one end cover. The inventive thermal battery protection device is disposed inside the outer casing (160), below the end cover (110) and above the electrode stack (150).

Please refer to the second figure, which is an embodiment of the thermal battery protection device of the present invention. As shown in the figure, one end cap group (200) of a thermal battery comprises two terminals (210), two glass components (220), and one end. a cover (230), wherein the thermal battery protection device of the present invention is disposed on the inner side of the outer casing under the end cover (230), wherein the thermal battery protection device comprises more than one end cap ring (240) and a heat The fixing resin (250) is disposed on the inner side of the outer casing under the end cover (230), and the thermosetting resin (250) is located inside the end cover ring (240). Can The terminal (210) of the thermal battery is cured by the thermosetting resin (250), and the glass element is filled with the gap between the excitation element (260), the terminal (210) and the glass element (220). (220) is tightly coupled with the end cap (230) to block harmful gas and heat energy, and the deformation resistance of the end cap group (200) can be improved.

Since the thermosetting resin is surrounded by an end cap ring, the end cap ring can be used as a glue injection container. When the thermosetting resin is cured, the end cap ring can be removed without being used as an end cap group. In addition, the end cap ring also has the ability to withstand the axial combined pressure to buffer the pressure of the end cap group and the electrode stack, the air heat during sealing of the battery and the end cap, and the temperature and pressure during operation of the battery. And the function of the container with the end cap encapsulating glue.

An embodiment of the thermal battery protection device of the present invention, wherein the end cap ring can be composed of a laminated fiber cloth and a resin, and the laminated fiber cloth can be made of glass fiber, carbon fiber, cotton fiber, wood fiber or man-made petrochemical. The material of the resin may be epoxy resin, phenolic resin or enamel resin; in another embodiment, the end cap ring may be composed of mica paper and a resin, and the material of the laminated fiber cloth may be glass fiber. , phlogopite or muscovite, the material of the resin may be epoxy resin, phenolic resin or enamel resin; the material of the thermosetting resin is epoxy resin, phenolic resin or enamel resin, and the thermosetting resin may be additionally added a ceramic powder, the ceramic powder may be made of magnesium oxide, calcium oxide, aluminum oxide, cerium oxide, zirconium oxide, boron nitride or tantalum carbide. The ceramic powder may have a particle size ranging from 0.1 to 20 micrometers for reinforcement. The thermosetting resin.

Another embodiment of the thermal battery protection device of the present invention, with a glass Glass fiber tape (3M tape 90) fixed three end cap rings (outer diameter 60mm, inner diameter 50mm, thickness 1.6mm) and one end cover, inject an epoxy resin reinforced with alumina powder (EPON 828), inject the epoxy The resin is homogenized to the end cap ring, matured at 90 ° C for 16 hours, and the glass fiber tape is cut off after cooling, the end cap ring does not have to be removed, and as a part of the end cap group, the glass component is subjected to compression destructive test. The maximum load is increased from 602kgf to 1063kgf.

The invention provides a thermal battery protection device, which integrates more than one end cap ring and a thermosetting resin, whereby the end cap ring can bear the axial combined pressure to buffer the stress of the end cap and the inner shell group. As a container for end cap encapsulation, it can withstand the heat of the battery and the end cap during sealing and the temperature and pressure when the battery is working; the thermosetting resin is tightly combined with the battery end cover to improve the deformation resistance of the end cap. To solve the problems of conventional technology.

The above embodiments are merely illustrative of the features and functions of the present invention and are not intended to limit the scope of the technical contents of the present invention. Any person skilled in the art can implement the above without departing from the spirit and scope of the creation. The examples are modified and changed. Therefore, the scope of protection of this creation should be as listed in the scope of the patent application described later.

Claims (10)

A thermal battery protection device is disposed on a thermal battery having an end cover, a casing, and an electrode stack. The thermal battery protection device includes: one or more end cap rings disposed on the inner side of the outer casing, under the end cover and the electrode Above the stack, the end cap ring, the end cap and the electrode stack together define an internal space; a thermosetting resin is disposed in the internal space. The thermal battery protection device of claim 1, wherein the end cap ring is composed of a laminated fiber cloth and a resin. The thermal battery protection device according to claim 2, wherein the material of the laminated fiber cloth is selected from the group consisting of glass fiber, carbon fiber, cotton fiber, wood fiber, and artificial petrochemical fiber. The thermal battery protection device according to claim 2, wherein the resin is made of an epoxy resin, a phenol resin or a enamel resin. The thermal battery protection device of claim 1, wherein the end cap ring is composed of a layer of mica paper and a resin. The thermal battery protection device according to claim 5, wherein the material of the laminated mica paper is selected from the group consisting of phlogopite and muscovite. The thermal battery protection device according to claim 5, wherein the resin is made of an epoxy resin, a phenol resin or a enamel resin. The thermal battery protection device of claim 1, wherein the thermal battery protection device further comprises a ceramic powder added to the thermosetting resin, wherein the ceramic powder is selected from the group consisting of magnesium oxide and oxidation. A group consisting of calcium, alumina, yttria, zirconia, boron nitride, and tantalum carbide. The thermal battery protection device according to claim 9, wherein the ceramic powder has a particle size ranging from 0.1 to 20 μm. The thermal battery protection device according to claim 1, wherein the thermosetting resin is made of an epoxy resin, a phenol resin or a enamel resin.