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Septum used in battery

A battery and separator technology, which is applied in the field of battery separators, can solve the problems of battery separators such as reduced voids, reduced tear strength, reduced liquid absorption or liquid retention, and achieves excellent quality uniformity and tear resistance. excellent cracking strength

Active Publication Date: 2013-01-30
MITSUBISHI PAPER MILLS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these separators for batteries, core-sheath composite fibers or polyethylene monofilaments are used, which have thermally adhesive polypropylene as a core component and polyethylene as a sheath component. In order to heat-weld polyethylene, polyethylene The formation of a film not only causes a decrease in tear strength, but also reduces the gaps in the battery separator, resulting in a decrease in liquid absorption or liquid retention

Method used

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  • Septum used in battery
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Examples

Experimental program
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Effect test

Embodiment 1）

[0061] A core-sheath composite fiber (cross-sectional area ratio (β / α) = 70 / 30, melting peak area ratio (A / B ) = 0.60, fineness 0.8dtex, fiber length 5mm) 100 parts by mass were dissociated and dispersed in the water of the pulper, and stirred slowly with a stirrer to prepare a uniform slurry for papermaking. The papermaking slurry is made using the wet papermaking method using a cylinder paper machine, and is dried by a Yankee dryer with a hot plate pressing method set at 135°C and a hot air hood installed side by side. The sheath portion of the core-sheath composite fiber was thermally melt-bonded to produce a nonwoven fabric having a width of 500 mm. Alkyl phosphate ester salt (manufactured by Takamatsu Yushi Chemical Co., Ltd., trade name: Elenait AB-100) as a surfactant is impregnated and coated at a concentration of 0.50% by mass, dried, and corona treated. The super calender adjusts the thickness to 120 μm to obtain a battery separator.

Embodiment 2～17）

[0063] In addition to using the core-sheath composite fiber (fineness 0.8dtex, fiber length 5mm) having the cross-sectional area ratio (β / α) and melting peak area ratio (A / B) described in Table 1, polypropylene was used as the core component (melting point: 165° C.) and a core-sheath composite fiber in which the sheath component was polyethylene (melting point: 135° C.), a battery separator was obtained in the same manner as in Example 1.

Embodiment 18）

[0065] A core-sheath composite fiber (cross-sectional area ratio (β / α) = 70 / 30, melting peak area ratio (A / B ) = 0.78, fineness 0.8dtex, fiber length 5mm) 100 parts by mass were dissociated and dispersed in the water of the pulper, and stirred slowly with a stirrer to prepare a uniform slurry for papermaking. The papermaking slurry is made using the wet papermaking method using a cylinder paper machine, and is dried by a Yankee dryer with a hot plate pressing method set at 135°C and a hot air hood installed side by side. The sheath portion of the core-sheath composite fiber was thermally melt-bonded to produce a nonwoven fabric having a width of 500 mm. Alkyl phosphate ester salt (manufactured by Takamatsu Yushi Chemical Co., Ltd., trade name: エレナイト AB-100) as a surfactant is impregnated and coated at a concentration of 0.05% by mass, dried, and corona treated. The super calender adjusts the thickness to 120 μm to obtain a battery separator.

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Abstract

The invention provides a septum used in a battery which is suitable to be used in nickel-cadmium battery, nickel-zinc battery, nickel-hydrogen battery, and other alkaline rechargeable batteries. The septum has excellent tear strength, and using a surfactant makes for reducing short circuit incidence rate. The septum is made of non-woven fabric which is processed by hydrophilization. The septum used in the battery is formed by a core-sheath type complex fibernon-woven fabric, with polypropylene as composition of a core and polyethylene as composition of a sheath. The septum is characterized in that a ratio ([beta / alpha]) of a sectional area ([beta]) of polypropylene and a sectional area ([alpha])ofpolyethylene is larger than 50 / 50 and is lower than 90 / 10. In a DSC curve obtained by differential scanning thermal analysis of the septum used in the battery, a ratio (A / B) of fusing peak area (A) from the polyethylene on a low-melting-point side and fusing peak area (B) from the polypropylene on a high-melting-point side is larger than 0.15 and lower than 1.20.

Description

technical field [0001] The present invention relates to a battery separator that can be suitably used in alkaline secondary batteries such as nickel-cadmium batteries, nickel-zinc batteries, and nickel-hydrogen batteries. Background technique [0002] Alkaline secondary batteries such as nickel-cadmium batteries and nickel-hydrogen batteries have excellent charge-discharge characteristics and overcharge-discharge characteristics, and can be used repeatedly for a long life. Therefore, they are used in small electronic devices such as wireless phones, notebook computers, and audio equipment. , It is also widely used in small-scale power applications such as electric tools and electric bicycles, and large-scale power applications such as hybrid vehicles and electric vehicles. As the functions of the battery separator used in this alkaline secondary battery, separation of the positive electrode and the negative electrode, prevention of short circuit, liquid absorption and retent...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 大山圭介广田展章
Owner MITSUBISHI PAPER MILLS LTD
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