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Composite separator for vented prismatic nickel-cadmium battery and preparation method thereof

A composite diaphragm and nickel-cadmium battery technology, which is applied in the direction of nickel storage battery, alkaline storage battery, battery pack parts, etc., can solve the misalignment or wrinkle of nylon fabric surface layer and polyethylene grafted membrane core layer, and nylon cloth storage liquid Poor performance, affecting battery performance and other issues, to achieve the effect of benefiting discharge performance, reducing or avoiding water loss, and rich pore structure

Active Publication Date: 2017-09-01
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 cloth to age and lose its liquid storage function
(3) The polyethylene grafted film of the core layer has a non-porous structure, and its surface resistance is relatively high, which affects the discharge performance of the battery; it has no gas permeability, and the oxygen and hydrogen generated during the charging process will increase the internal pressure of the battery and be discharged through the exhaust valve. Causes rapid water loss and requires frequent replenishment of electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of the composite diaphragm for the vented prismatic nickel-cadmium battery includes the following steps:

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

[0027] (2) The diaphragm substrate is continuously irradiated by the electron accelerator in an expanded state, and the beam flow rate of the electron accelerator and the transmission speed of the diaphragm substrate are controlled so that the absorbed dose received by the diaphragm substrate is 20kGy;

[0028] (3) Put the irradiated membrane substrate into the grafting reactor, seal, vacuum, and then suck the grafting liquid from the bottom of the grafting reactor into the grafting reactor under vacuum, and control the liquid fe...

Embodiment 2

[0032] The preparation method of the composite diaphragm for the vented prismatic nickel-cadmium battery includes the following steps:

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

[0034] (2) Place the diaphragm substrate in a cobalt 60γ-ray radiation source, and control the position and time of the diaphragm substrate in the irradiation chamber to make the absorbed dose of the diaphragm substrate 50kGy. When the irradiation time is over half, stop Irradiation, turn the diaphragm base material up and down and back and forth, and continue to irradiate in the lower half of the process, so that the diaphragm base material can be irradiated evenly;

[0035] (3) Put the irradiated membrane substrate into the grafting reac...

Embodiment 3

[0039] The preparation method of the composite diaphragm for the vented prismatic nickel-cadmium battery includes the following steps:

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

[0041] (2) The diaphragm substrate is continuously irradiated by the electron accelerator in an expanded state, and the beam flow rate of the electron accelerator and the transmission speed of the diaphragm substrate are controlled to make the absorbed dose received by the base cloth 15kGy;

[0042] (3) Put the irradiated membrane substrate into the grafting reactor, seal, vacuum, and then suck the grafting liquid from the bottom of the grafting reactor into the grafting reactor under vacuum, and control the liquid feed rate ...

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Abstract

Composite diaphragm for exhaust-type square nickel-cadmium battery and its preparation method. The composite diaphragm is a three-layer film composite structure composed of upper and lower layers and a core layer in the middle. The core layer is polypropylene microstructure with microporous structure. Porous film or polypropylene melt-blown cloth, the surface layer is polyolefin fiber non-woven fabric, the polyolefin fiber non-woven fabric is a composite fiber with a skin-core structure, the core layer is polypropylene, the skin layer is polyethylene, and the composite diaphragm The surface layer and the core layer are thermally bonded together through the polyethylene of the polyolefin fiber non-woven skin layer, and the thickness of the composite diaphragm is 0.15~0.5mm. The invention has the following advantages: (1) The structural characteristics of the three-layer composite film make the battery assembly process simple and easy, and there will be no misalignment and wrinkles between the surface layer and the core layer; (2) The core layer polypropylene micropores The film or polypropylene melt-blown cloth has a microporous structure, and its inner and outer surfaces are endowed with carboxyl and / or sulfonic acid hydrophilic functional groups by radiation grafting, with permanent hydrophilicity and micro-breathability.

Description

Technical field [0001] The invention belongs to the technical field of battery diaphragms, and in particular relates to a composite diaphragm for vented square nickel-cadmium batteries 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, reliable and safe performance, they are widely used in aviation, high-speed rail, ships and military industries as backup power sources. The diaphragm is a key component of the battery, which has an important influence on the assembly process, performance, safety and reliability of the battery. The traditional vented prismatic nickel-cadmium battery mainly uses polyethylene grafted membrane as the core layer and nylon fabric as the surface layer, which is used as a diaphragm by lamination. The actual use process shows that this separator and its application method have the following defects: (1) The battery assembly proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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