[转帖]Ni-MH battery

组别:中级工程师

2007-08-31 10:17 | 只看楼主

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Material for terminals in products using the batteries
Because small amounts of alkaline electrolyte can leak from the battery seal during extended use or when the safety vent is activated during improper use, a highly alkaline-resistant material should be used for a product＇s contact terminals in order to avoid problems due to corrosion.

High Alkaline-resistant Metals:Nickel stainless steel, nickel plated steel, etc
Low Alkaline-resistant Metals

in ,aluminum, zinc, cooper, brass,etc
(Note: that stainless steel generally results in higher contact resistance.)

08 31 2007 10:16AM

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组别:中级工程师

2007-08-31 10:18 | 只看楼主

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Temperature related the position of batteries in products
As excessively high temperatures (i.e. more than 45℃) can cause alkaline electrolyte to is leak out from the battery, thus damaging the product and shorten battery life by causing deterioration in the separator or other battery parts, install batteries far from heat-generating parts of the product. The best battery position is in a battery compartment that circuitry. This prevents damage that may be caused by a slight leakage of alkaline electrolyte from the battery. Be careful particularly when trickle charge is carried out(for contions charge).

08 31 2007 10:18AM

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组别:中级工程师

2007-08-31 10:19 | 只看楼主

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Discharge end voltage
The discharge end voltage is determined by the formula given below. Please set the end voltage of each battery at 1.1 volts or less.Number of batterries arranged serially:
1 to 6 (Number of batteries*1.0)V
7 to 20 ((Number of batteries-1)*1.2)V

Overdischarge (deep discharge) prevention
Overdischarging (deep discharging) or reverse charging damages the battery or leaving characteristics. In order to prevent damage associated with forgetting to turn off the switch the battery in the equipment for extended periods, it is hoped that preventative options should be incorporated in the equipment. At the same time, it is recommended that leak-age current is minimized. Besides, the battery should not be shipped inside the equipment.

08 31 2007 10:18AM

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组别:中级工程师

2007-08-31 10:19 | 只看楼主

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6. Prohibited Items Regarding the Battery Handling
We assumes no responsibility for problems resulting from batteries handled in the following manner.
A. Disassembly
Never disassemble a battery, as the electrolyte inside is strong alkaline and can damage skin and clothes.
B. Short-circuiting
Never attempt to short-circuit a battery. Doing so can damage the product and generate heat that can cause burns.
C. Throwing batteries into a fire or water
Disposing of a battery in fire can cause the battery to rupture. Also avoid placing batteries in water, as this causes batteries to cease to function.

08 31 2007 10:18AM

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组别:中级工程师

2007-08-31 10:19 | 只看楼主

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D. Soldering
Never solder anything directly to a battery. This can destroy the safety features of the battery by damaging the safety vent inside the cap.
E. Inserting the batteries with their polarities reversed
Never insert a battery with the positive and negative poles reversed. as this can cause the battery to swell or rupture.
F. Overcharging at high currents and reverse charging
>Never reverse charge or overcharge with high currents (i.e. more than rated). Doing so causes rapid gas generation and increased gas pressure, thus causing batteries to swell or rupture.
>Charging with an unspecified charger or specified charger that has been modified can cause batteries to swell or rupture. Be sure to indicate this safety warning clearly in all operating instructions as a handling restriction for ensuring safety.

08 31 2007 10:19AM

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组别:中级工程师

2007-08-31 10:20 | 只看楼主

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G. Installation in equipment (with a sealed construction)
Always avoid designing airtight battery compartments. In some cases, gases (oxygen, the hydrogen) may be given off, and there is a danger of the batteries bursting or rupturing in presence of a source of ignition (sparks generated by a motor switch, etc.).
H. Use of batteries for other purposes
Do not use a battery in an appliance or purpose for which it was not intended. Differences in specifications can damage the battery or appliance.
I. Short-circuiting of battery packs
Special caution is required to prevent short-circuits.Because of product or battery shape, in case battery packs that are used as insertion to equipment may be inserted in reverse. And also, caution must be given to certain structures, which, depending on product terminal shape.

08 31 2007 10:19AM

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组别:中级工程师

2007-08-31 10:20 | 只看楼主

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J. Using old and new batteries together
Avoid using old and new batteries together. Also avoid using these batteries with ordinary dry-cell batteries, Ni-Cd batteries or with another manufacturer＇s batteries.ordinary dry-cell batteries, Ni-Cd batteries or with another manufacturer＇s batteries.Differences in various characteristic values, etc.,can cause damage to batteries or the product.

08 31 2007 10:20AM

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组别:中级工程师

2007-08-31 10:21 | 只看楼主

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7. Other Precautions
>Batteries should always be charged prior to use. Be sure to charge correctly.
>In order to ensure safe battery use and to prolong the battery performance, please the consult us regarding charge and discharge conditions for use and product design prior to release of a battery-operated product.
>A rechargeable battery is delivered without charge, so its voltage may be lower than 1.2V. It will recover to normal level after a charge cycle.
>Before the test or use, batteries shall be discharged because they may have some residual capacity.
>Do not swallow batteries.

08 31 2007 10:20AM

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组别:中级工程师

2007-08-31 10:22 | 只看楼主

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Storage Characterictics
Essentially all rechargeable battery cells gradually discharge over time whether they are used or not. This capacity loss is typically due to slow parasitic reactions occurring within the cell. As such, the loss rate(self-discharge rate) is a function of the cell chemistry and the temperature environment experienced by the cell. Due to the temperature sensitivity of the self-discharge reactions, relatively small differences in storage temperature may result in large differences in self-discharging rate. Extended storage with a load connected not only speeds the discharge process, but may also cause chemical changes after the cell is discharged, which may be difficult or impossible to reverse.Cell and battery storage issues of concern to most application designers relate either to the speed with which the cells lose their capacity after being charged or the ability of the cells to charge and discharge "normally" after storage for some period of time. In both situations, general guidelines developed for nickel-cadmium cells will work acceptably for nickel-metal hydride cells.

08 31 2007 10:21AM

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组别:中级工程师

2007-08-31 10:22 | 只看楼主

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1. Retained Capacity
Figure 24 illustrates the amount of capacity available from nickel-metal hydride cells after standing for a given number of days in four different thermal environments. The common rule of thumb for nickel-cadmium cells that a 10 Celsius increase in storage temperature halves the time required for a cell to self-discharge to a given level remains approximately correct for nickel-metal hydride cells.

08 31 2007 10:22AM

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电池论坛电池技术交流镍镉电池/镍氢电池 [转帖]Ni-MH battery