问题描述：
英语翻译
From the charge voltage curve ,it is known the charge process is divided into three stages :
preliminary charge stage ; senior charge stage ; overcharge stage.Preliminary charge stage is the
period during which the NiMH battery is to be charged.During this stage ,the battery voltage
quickly raises to the spot A due to the voltage on the internal cell resistance and enters the senior
charge stage.Usually ,the period of preliminary stage is very short .In the senior charge stage ,the variation of charge voltage is mainly the variation of battery voltage because the internal cell resistance hardly varies.So the battery capacity is larger and larger .The battery voltage increases
gradually until it reaches the maximum.And now ,the battery has been charged with a large
amount of energy.The period of the senior charge stage determines the time of the whole charge
process.Up to the overcharge stage ,the battery voltage has reached the maximum and the battery obtains more than 90 percent of the whole capacity.If the battery is charged continuously ,
the battery temperature and the internal pressure will increase quickly ,however the battery voltage will decrease gradually.So it is very effective to prevent the battery from being overcharged for a long time.
The essence of the NiMH battery charge process is the electrochemical process occurred in
the battery.Accompanied with the electrochemical reaction ,oxygen and hydrogen are generated
in the battery.The reaction of oxygen and hydrogen gas generation is expressed in Eqs.
In the electrochemical reaction the bubbles of hydrogen and oxygen can surround the electrodes ,which decreases the area that takes part in the electrochemical reaction and increases the resistance so as to prolong the charge progress.Usually at the beginning of charging ,most current are absorbed by the active material on the elect rode ,so little gas is generated.Under the condition that the speed of generating gas is lower than the speed of the solution and the gas recombination reaction ,the excessive pressure is prevented from building up in the battery.After the battery is charged fully ,the most of current isn’ t transformed into the store energy of battery but is used to promote the electrochemical reaction of generating hydrogen and oxygen ,and then ,the pressure in the battery will increase up to excess and the battery will be destroyed.In the over charge stage ,the excessive oxygen will transform NiOOH into Ni (OH) 2 .As a result ,the battery voltage decreases.
From the charge voltage curve ,it is known the charge process is divided into three stages :
preliminary charge stage ; senior charge stage ; overcharge stage.Preliminary charge stage is the
period during which the NiMH battery is to be charged.During this stage ,the battery voltage
quickly raises to the spot A due to the voltage on the internal cell resistance and enters the senior
charge stage.Usually ,the period of preliminary stage is very short .In the senior charge stage ,the variation of charge voltage is mainly the variation of battery voltage because the internal cell resistance hardly varies.So the battery capacity is larger and larger .The battery voltage increases
gradually until it reaches the maximum.And now ,the battery has been charged with a large
amount of energy.The period of the senior charge stage determines the time of the whole charge
process.Up to the overcharge stage ,the battery voltage has reached the maximum and the battery obtains more than 90 percent of the whole capacity.If the battery is charged continuously ,
the battery temperature and the internal pressure will increase quickly ,however the battery voltage will decrease gradually.So it is very effective to prevent the battery from being overcharged for a long time.
The essence of the NiMH battery charge process is the electrochemical process occurred in
the battery.Accompanied with the electrochemical reaction ,oxygen and hydrogen are generated
in the battery.The reaction of oxygen and hydrogen gas generation is expressed in Eqs.
In the electrochemical reaction the bubbles of hydrogen and oxygen can surround the electrodes ,which decreases the area that takes part in the electrochemical reaction and increases the resistance so as to prolong the charge progress.Usually at the beginning of charging ,most current are absorbed by the active material on the elect rode ,so little gas is generated.Under the condition that the speed of generating gas is lower than the speed of the solution and the gas recombination reaction ,the excessive pressure is prevented from building up in the battery.After the battery is charged fully ,the most of current isn’ t transformed into the store energy of battery but is used to promote the electrochemical reaction of generating hydrogen and oxygen ,and then ,the pressure in the battery will increase up to excess and the battery will be destroyed.In the over charge stage ,the excessive oxygen will transform NiOOH into Ni (OH) 2 .As a result ,the battery voltage decreases.
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