The difference between automobile Ni-Mh battery and lithium battery

Lithium battery and the difference between the Ni-Mh batteries

The main difference between lithium batteries and nickel-metal hydride batteries mainly lies in the fact that lithium battery is suitable for mobile phones, while Ni-Mh batteries is suitable for digital camera because the current demand of digital camera is quite large, and the power consumption is much larger than mobile phones.

The advantages and disadvantages of lithium battery

Advantages: no memory effect, lighter in weight.

Disadvantages: high cost, current is small, not too full charge resistance (compared with nickel metal hydride).

Lithium-ion batteries have a li-ion battery (rechargeable) and secondary li-ion battery (rechargeable), secondary lithium electricity divides Li - ion lithium ion batteries and Li - polymer lithium polymer battery。

General digital camera using a secondary li-ion battery (rechargeable), compared with Ni-Mh batteries, light in weight and volume energy density was 48% higher than it. Because of this, production and sales of lithium ion secondary battery are gradually more than Ni-Mh batteries. The battery discharge little self, and no memory effect, charge and discharge frequency can reach more than 600 times, especially in recent years was developed by the Li - Polymer lithium polymer battery, in addition to a smaller, but also general battery cylinder or square shape without limit, the weight is lighter.

Lithium battery for not too full charge, if careless use of the will is in danger of explosion, therefore need built-in control IC, prevent too full charge, but the cost is also relatively improve many. Lithium batteries because the specification is not unified, so will buy battery case after organic kind of production. But it has improved a lot.

The advantages and disadvantages of Ni-Mh batteries

Advantages: low prices, strong commonality, large current, environmental protection and stability.

Disadvantages: large weight, battery life is shorter.

Nickel metal hydride battery design stems from a nickel cadmium battery, but on improving nickel cadmium battery memory effect, have great progress. The main change in use of cadmium in hydrogen storage alloy replaces the original negative, so the Ni-Mh batteries can be said to be the typical representative of material innovation. And pollution caused by Ni-Mh batteries, smaller than containing cadmium nickel cadmium battery will be many, therefore, the nickel cadmium battery has been gradually replaced by the Ni-Mh batteries.

Lithium battery except minority has a lithium-ion battery can be used (NIKONEN EL1 and 2 cr5) most of them are no alternative battery, this to want to go abroad for a long time, or a large number of users is very troublesome, nickel metal hydride batteries had no such problems, using digital cameras of Ni-Mh batteries can often use alkaline battery replacement.

In recent years, increasing use Ni-Mh batteries, digital camera battery manufacturers also bullish on the market, with high capacity of nickel metal hydride rechargeable batteries, make Ni-Mh battery technology by leaps and bounds, the capacity is becoming more and more big, use the same time with lithium battery, the charger is becoming more and more advanced, charging time shortened significantly.

Electric cars have long studied actually, just because of a variety of battery technology performance is far from practical application of the gap is not popularized;

Previously used by the Japanese development of electric vehicles is the Ni-Mh batteries, with the emergence and popularity of the lithium battery, the obvious advantage than the Ni-Mh batteries have, especially electricity ratio and high voltage, so instead of Ni-Mh batteries.

The ternary lithium batteryIs one of the lithium battery, compared with other kinds of lithium battery, ternary lithium battery is the biggest advantage of high voltage, large power than, for security reasons at present the country allows you to use in the car, with the development of battery technology, later also will use the bus on the higher electric vehicle safety requirements.

1, nickel metal hydride battery development early, is already very mature, but seem a bit backward technology at present, the biggest disadvantage is has the memory effect, influence the ease of use and sustainability;

2, the lithium battery development relatively late, but technology developing rapidly, at present most of the research is focused on lithium battery technology, the biggest advantage is no memory effect, defect is lithium battery cost is relatively high.,

Nickel metal hydride batteries are older, but the technology mature, Toyota's hybrid system, in particular, the three generations are with nickel metal hydride batteries, reliability, life and a guarantee for safety.

Lithium-ion batteries are new direction of the industry recognized in the recent ten years, all aspects of performance on nickel metal hydride batteries, just process, technology has not been very mature, occasionally will still hear some lithium battery safety problems. As technology advances, lithium batteries must be trend and has not yet been put into production of the Prius plug-in versions of Toyota's have also been used in lithium batteries.

But, after all, is the new thing, no one can guarantee the reliability and security of one hundred percent, Boeing 787 lithium-ion battery, there is a fire accident.

Sharply on the 4th generation Prius, in addition to the exterior styling changes, the efficiency of transmission system, but also the important characteristics of a new generation of products, the Prius carry a 1.8 -liter inline 4 cylinder of Atkinson cycle engine, inline 4 cylinder gasoline engine with electric motor, the architecture of the maximum synergy is 121 horsepower. Although the synergy horsepower figures revised down from the previous generation, but still accelerates the speed of 100 km of strength is not out too far, the average fuel consumption data more former generation of 4.1 L / 100 km, up to 3 L / 100 km.

Original said, would use the collocation of two different kinds of battery pack, the key is to "weight", the Prius configuration of lithium battery, nickel metal hydride battery pack lighter in weight of about 16 kilograms, Toyota will be configured in advanced models equipped with relatively abundant, complete (with more so the heavier weight of the car), in order to balance the overall effectiveness of performance. According to understand, however, the collocation of lithium-ion battery pack only in North America, and Japan market, also only in the advanced model configuration (the Japanese market for introductory and advanced).

Compared with nickel metal hydride batteries, lithium batteries have low self discharge, low memory effect and fast charge and discharge, nickel metal hydride batteries, on the other hand, however, it also represents the price drop sharply; In the fourth generation of Prius on the power system of lithium-ion battery pack version only 56 Cells, while Ni-Mh battery pack has 168 Cells, that's why Toyota said its cost is not far from; Provided in voltage section, lithium battery voltage of 207.2 v, 201.6 v Ni-Mh battery pack, not far from the two, so the efficiency is not affected.

Carrying on the 4th generation Prius lithium battery pack, only 56 Cells, while Ni-Mh battery pack has 168 Cells, so both close on cost price, and the output voltage are equal, but the weight of the lithium battery is nickel metal hydride battery pack light 16 kilograms.

Perhaps in order to avoid any misunderstanding, and avoid unnecessary negative situation, the advanced model cars with rich equipment in North American market have heavy weight, and achieve the 3/100 km average fuel consumption figures published by the original factory by the setting of lithium-ion battery pack lightweight. In addition, the Toyota Prius will also be the first TSS (Toyota Safety Sense) active safety systems at home.

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