Composite membrane for exhaust-type square nickel-cadmium battery and preparation method of composite membrane

A composite diaphragm, nickel-cadmium battery technology, applied in the direction of nickel storage battery, alkaline storage battery, battery pack parts, etc., can solve the dislocation or wrinkle of nylon fabric surface layer and polyethylene graft film core layer, nylon cloth liquid storage Poor performance, affecting battery performance, etc., to achieve the effect of favorable discharge performance, reduction or avoidance of water loss, and rich pore structure

Active Publication Date: 2015-11-25
HENAN KEGAO RADIATION CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual use process shows that this separator and its application method have the following defects: (1) The battery assembly process is complicated, and local misalignment or wrinkles between the nylon fabric surface layer and the polyethylene grafted film core layer are prone to occur, which affects battery performance , or even cause a short circuit
(2) Nylon cloth has poor liquid storage performance. After the battery works at high temperature for a long time, it is easy to cause nylon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method for a composite separator for a vented square nickel-cadmium battery, comprising the steps of:

[0026] (1) With 16μm thick polypropylene microporous membrane as the core layer, 30g / m 2 The surface density ES fiber wet-laid non-woven fabric is the upper and lower layers, and the three-layer film is laminated together at a temperature of 150°C by using a heat sealing machine to form a diaphragm substrate;

[0027] (2) Continuously irradiate the diaphragm base material through the electron accelerator in the unfolded state, control the beam flow rate of the electron accelerator and the transmission speed of the diaphragm base material, so that the absorbed dose received by the diaphragm base material is 20kGy;

[0028] (3) Put the irradiated diaphragm base material into the grafting reactor, seal it, and vacuumize it, then suck the grafting liquid from the bottom of the grafting reactor into the grafting reactor by vacuum, and control the feeding spee...

Embodiment 2

[0032] A preparation method for a composite separator for a vented square nickel-cadmium battery, comprising the steps of:

[0033] (1) With 45μm thick polypropylene microporous membrane as the core layer, 50g / m 2 The surface density ES fiber wet-laid non-woven fabric is the upper and lower layers, and the three-layer film is laminated together at a temperature of 150°C by using a heat sealing machine to form a diaphragm substrate;

[0034] (2) Place the diaphragm substrate in the cobalt 60 gamma-ray radiation source. By controlling the position and time of the diaphragm substrate in the irradiation chamber, the absorbed dose received by the diaphragm substrate is 50kGy. When the irradiation time exceeds half, stop Irradiation, turn the diaphragm substrate upside down and back and forth, and continue to irradiate in the second half, so that the diaphragm substrate can be irradiated evenly;

[0035] (3) Put the irradiated diaphragm base material into the grafting reactor, seal...

Embodiment 3

[0039] A preparation method for a composite separator for a vented square nickel-cadmium battery, comprising the steps of:

[0040] (1) at 15g / m 2 Polypropylene melt-blown cloth with surface density is used as the core layer, with a density of 30g / m 2The surface density ES fiber wet-laid non-woven fabric is the upper and lower layers, and the three-layer film is laminated together at a temperature of 135°C by using a heat sealing machine to form a diaphragm substrate;

[0041] (2) Continuously irradiate the diaphragm base material through the electron accelerator in the unfolded state, control the beam flow rate of the electron accelerator and the transmission speed of the diaphragm base material, so that the absorbed dose received by the base cloth is 15kGy;

[0042] (3) Put the irradiated diaphragm base material into the grafting reactor, seal it, and vacuumize it, then suck the grafting liquid from the bottom of the grafting reactor into the grafting reactor by vacuum, and...

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Abstract

The invention discloses a composite membrane for an exhaust-type square nickel-cadmium battery and a preparation method of the composite membrane. The composite membrane is in a three-layer membrane composite structure composed of an upper surface layer, a lower surface layer and a middle core layer, wherein the core layer is a polypropylene microporous membrane or polypropylene melt-blown fabric with a micropore structure; the surface layers are polyolefin fiber nonwoven fabric; the polyolefin fiber nonwoven fabric is made of a composite fiber with a skin-core structure; the core layer is made of polypropylene; the skin layer is made of polyethylene; the surface layers and the core layer of the composite membrane are thermally bonded together through the polyethylene of the skin layer of the polyolefin fiber nonwoven fabric; and the thickness of the composite membrane is 0.15-0.5mm. The composite membrane has the advantages that (1) by the three-layer composite membrane structure, the battery assembly process becomes simple and feasible, and dislocation and creases of the surface layers and the core layer are avoided; and (2) the polypropylene microporous membrane or the polypropylene melt-blown fabric of the core layer has the micropore structure; internal surface carboxyl, internal surface carboxyl and/or sulfonyle hydrophilic functional groups are provided through radiation grating; and the composite membrane has permanent hydrophilicity and micro-ventilating function.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and in particular relates to a composite diaphragm for a vented square nickel-cadmium battery and a preparation method thereof. Background technique [0002] Vented prismatic nickel-cadmium batteries are an important type of large alkaline batteries. Due to their stable performance, reliability and safety, they are widely used as backup power sources in aviation, high-speed rail, ships and military industries. The separator is a key component of the battery, which has an important impact on the assembly process, performance, safety and reliability of the battery. The traditional vented square nickel-cadmium battery mainly uses polyethylene graft film as the core layer and nylon fabric as the surface layer, which is used as a separator by lamination. The actual use process shows that this separator and its application method have the following defects: (1) The battery assembly process ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/30H01M50/403H01M50/417H01M50/44H01M50/457H01M50/489
CPCH01M10/30H01M50/44H01M50/409H01M50/449Y02E60/10
Inventor 崔国士党从军崔攀赵红英
Owner HENAN KEGAO RADIATION CHEM TECH
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