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Charging method for nickel-hydrogen dynamic battery with constant voltage
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A power battery and charging method technology, which is applied in the electronic field, can solve problems such as unsafety, low charging efficiency, and severe reaction polarization, and achieve the effects of avoiding battery overcharging, improving charging efficiency, and alleviating the degree of polarization
Inactive Publication Date: 2009-03-04
有研科技集团有限公司
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Problems solved by technology
The charging process of the Ni-MH power battery is: the positive electrode reaction is the reaction of nickelous hydroxide and hydroxide to form nickel oxyhydroxide and water, the negative electrode reaction is the hydrogen absorption process of the hydrogen storagealloy, and the charging reaction is an exothermic reaction. In the later stage of charging, The reaction polarization is serious, the electrode potential rises rapidly, accompanied by side reactions of oxygen evolution, which affects the charging efficiency of the battery
[0003] At present, the Ni-MH power battery adopts the constant current charging method: the charging current generally adopts 1 / 3C (that is, 1 / 3×rated capacity, this expression can be applied to any capacity Ni-MH power battery), after charging to 100%, , use 0.1C to charge for 1 hour, this charging method takes a long time; if a large current is used for charging, the charging time is short, but the charging efficiency is low
[0004] In practical applications, the safety of the constant voltage charging mode is more significant. Using constant current charging to control the negative variable voltage or temperature rise rate has a certain degree of safety problems, because the phenomenon of negative variable voltage or temperature rise rate is too fast At this time, the battery has actually been overcharged, the internal pressure of the battery is high, and it is easy to leak alkali, so the safety of use cannot be guaranteed. In addition, the temperature is too high, which may also lead to different degrees of attenuation of the performance of the active material of the battery.
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Embodiment 1
[0020] Embodiment 1: Combine 10 (N=10,) 80Ah Ni-MH batteries into a 12V module for charging, and at the same time connect the test circuit with the BT2000 high-current device for testing.
[0021] Under the environment of 20°C, the charged battery is charged with a constant voltage of 14.3V throughout the whole process, and the measured initial value of the current reaches 122A, and then gradually decreases (see figure 1 ), when the charging capacity reaches 72Ah, the current becomes 0A, and after 0.5 hours on hold, 1 / 3C discharges, the capacity is 70Ah, and the charging efficiency is greater than 96%.
[0022] Under the same ambient temperature, if the existing technology is used for constant current charging at 0.5C, it will charge 72Ah, and after 0.5 hours of storage, it will discharge 70Ah, with an efficiency of 93%.
[0023] The conclusion is: the constant voltage charging method of the nickel-hydrogen power battery of the present invention is more efficient than the prio...
Embodiment 2
[0024] Embodiment 2: Same as Embodiment 1, combine 10 80Ah Ni-MH batteries into a 12V module for charging, and at the same time connect the test line with the BT2000 high-current device and then conduct the test.
[0025] Under the environment of 20°C, the charged battery is charged with a constant voltage of 14.5V throughout the whole process, and the measured current gradually decreases from 144A to 0A (see figure 2 ), the charging capacity is 80Ah, after 0.5 hours of storage, the 1 / 3C discharge is 78Ah, and the efficiency is greater than 96%.
[0026] From Embodiment 1 and Embodiment 2, it can be seen that when a suitable charging voltage value is selected to charge the battery, the Ni-MH power battery is charged to the charging capacity (the charging capacity is less than 5% to 10% of the rated capacity of the battery). , the charging current automatically becomes 0, which ensures the safety of the actual use of the battery.
Embodiment 3
[0027] Embodiment 3: Same as Embodiment 1, combine 10 80Ah Ni-MH batteries into a 12V module for charging, and at the same time connect the test circuit with the BT2000 high-current device and then conduct the test.
[0028] The rechargeable battery is charged to about 50Ah with a constant voltage of 14.7V at 20°C, and its temperature rises to 30°C, an increase of 10°C, then it is turned to 14.3V to continue charging to 73Ah, and the current becomes 0A (see image 3 ).
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Abstract
The invention discloses a charging method with constant voltage of a nickel-hydrogenpower battery, which comprises the following steps: one or more than two matched charging voltage value(s) is / are selected to carry out whole process charging to a group of batteries with the number of N; when one matched charging voltage value is selected to carry out charging to a group of batteries with the number of N, 1.3 multiplied by N to 1.5 multiplied by Nv can be selected according to the needed charging capacity; when more than two charging voltage values are selected to carry out charging to the batteries, relatively high voltage values are firstly adopted to carry out charging, the voltage values are generally 1.45 multiplied by N to 1.6 multiplied by Nv and after the conversion condition is achieved, relative low voltage values are adopted to carry out charging and the voltage values are generally 1.3 multiplied by N to 1.45 multiplied by Nv; and the conversion condition is the time after the temperature of the charged batteries is raised to 10 to 20 DEG C or the period of time when the temperature-rising speed is more than 1 to 4 DEG C / min. The charging method of the invention has fast, uniform and safe charging and can guarantee the efficient charging of the batteries in the whole charging process.
Description
technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a constant-voltage charging method for a nickel-hydrogenpower battery. Background technique [0002] The positive electrode active material of Ni-MH power battery is nickelhydroxide, the negative electrode active material is hydrogen storage alloy, the electrolyte is alkaline solution, and the diaphragm is generally made of polypropylene or polyurethane. The charging process of the Ni-MH power battery is: the positive electrode reaction is the reaction of nickelous hydroxide and hydroxide to form nickel oxyhydroxide and water, the negative electrode reaction is the hydrogen absorption process of the hydrogen storagealloy, and the charging reaction is an exothermic reaction. In the later stage of charging, The reaction polarization is serious, the electrode potential rises rapidly, and the side reaction of oxygen evolution occurs, which affects the charging effi...
Claims
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Application Information
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