Now the majority of electric bikes use lead-acid batteries because of their low cost and high cost-performance. This unique of battery is, when they are used for a period of time and battery voltage drops, it can make the voltage recovers by reverse current . This battery is called "lead-acid battery" because they can be charged and used repeatedly
Electric bikes often use the following four kinds of batteries, the maintenance-free valve regulated lead-acid batteries, gel lead-acid batteries, nickel metal hydride batteries and lithium ion batteries.
Lead-acid batteries
The commercialized electric bicycles mostly use sealed lead-acid batteries, they are maintenance-free and don’t need to add water while using.
Gel batteries
It is an improvement on the base of common lead-acid batteries. It uses a gel electrolyte, and there is no free liquid inside. In the same volume, it has bigger electrolyte capacity, bigger heat capacity, and higher heat dissipation ability.
Nickel-metal hydride batteries
Nickel-metal hydride batteries were emerged rookie in the nineties batteries family, and they developed rapidly. The reaction of Ni-MH battery electrode is as follows:
Postive pole: Ni (OH) 2 + OH- = NiOOH + H2O + e- Negative pole: M + H2O + e = MHab + OH-Ni (OH) 2 + M = NiOOH + MHab Just like nickel-cadmium batteries, Ni-MH batteries also belong to alkaline battery. Their main advantages are: high energy ratio, high specific power, can be smoothly discharged at high currents, good discharge performance in low temperature, long cycle life, safe, reliable, maintenance free, no memory effect, no environmental pollution, renewable, in line with the sustainable development concept. However, Ni-MH batteries are very expensive.
Lithium Ion Battery
Lithium-ion batteries were pushed tho the market as a new type of high-energy batteries by Japan Sony Corporation in 1990. It is the highest specific energy among all the batteries at this moment, and has been widely used in portable information products. Lithium-ion batteries have the following advantages: large specific energy, high specific power, low self-discharge, no memory effect, good cycle characteristics, quick discharge, high efficiency, wide operating temperature range, no environmental pollution and etc.
Battery leakage
1) Symptom
2) fault inspection and handing
First inspect the apperance to find the leakage section. If there is no abnormal, then you should do air-tight test. Finally during the process of charging, observe whether some flown electrolyte. If yes, you should clean it up.
Deformation of the battery
2) fault inspection and handling
If a set of batteries (3 pieces) distort at the same time, then you need to check the voltage. If there is one or two deformed, then there are the following possibilities the battery capacity is inconsistent and the battery is over charged when charging.
(2) the plate of some batteries sulfation, the inner resistance increases, and the battery deforms when charging.
(3) some batteries are reverse-connection
3) Solutions
• under the premise of no leakage, add more liquid to prolong or prevent "thermal runaway" generation.
• Avoid an internal short circuit or micro-short circuit, or with a tendency to micro-short circuit.
• avoid over-discharge while using, and assure put in full electricity.
• inspect the battery charger strictly and prevent any overcharge phenomenon.
• When charging in high temperature, you should ensure the battery has very good heat dissipation. Cooling measures should be taken or shorten, otherwise you should stop charging.
Voltage drop fast
1) Symptom
Starting voltage drop quickly while a new battery start
2) Check processing
Check whether the actual voltage matches the battery meter display.
When battery voltage and meter display does not match, you should require manufacturers to adjust.
Check whether the current electric cars starting and running current is too large, if yes, you should should adjust
Check whether the battery capacity is too low, if yes, you should immediately.
Battery Sulfation
2) Check processing
The reasons for battery sulfation are as follows:
(1) stored for too long time, self-discharge rate is high
(2) not be timely charged or discharged.
(3) don’t charge for a long time.
(4) over discharge.
(5) the electrolyte has been dry or the concentration is too high.
When the battery sulfation, you should repaire according to their severity degree.
If slight Sulfation, you should charge and make it return to normal.
If serious Sulfation, you should charge or discharge by “water cure”, then it could return to normal.
Battery Maintenance
After production, to some extent, the life and performance of electric bikes battery depend on the consumer’s use and maintenance.
Matching of charger and battery
Electric vehicles batteries are often damaged by charging but not using, from this we could see the importance of the matching between charger and battery. Generally, there are two situations: First, the charger can not match the parameters provided by the battery manufacturer. Second, the charger components are of very poor quality. At the beginning of using, they are fairly matched, but after using for many times they can not match any more. It is recommended that consumers should buy the chargers which could match the battery from electric vehicle manufacturers, but not buy the poor quality charger in consideration of the cost.
Charging often and in time
Consumer often have a misunderstanding, they think that the battery life will reduced after charging, so every time they don’t charge the battery until the battery power has been under to the controller's protection voltage(31.5V). In this condition, the battery life will be shorten. So we remind all the consumers, if possible, the battery should timely charge. Prohibited continuing riding when the indicator shows under-voltage
While the indicator displays under-voltage, some customers often ride for a while and then rest for a while. In this condition, the battery maybe seriously damaged, The battery will be short circuited, and it may affect battery life.

Factory Profile

Sunbright Power, leading manufacturer focused in design and produce maintenance free sealed lead acid battery in China. The company registered capital of 8 million USD, with a total investment 70 million USD. It covers an area of 220 acres, 70,000 square meter production plant, and annual production capacity of one million KVAh. The batteries made by Sunbright include backup batteries applied in telecommunications, Power Plant, UPS battery, fire alarm system, emergency lighting and efficient energy storage batteries used in solar energy, wind energy and, as well as motive power batteries for electric vehicles, golf carts, electric forklift, electric traction trucks and other fields. All products are CE certificated, UL certificated, and TLC, ROSH certificated. SBB has won good reputation from market. In the year 2008, SBB is the only power supplier for Mount Everest section of Olympic torch route.


Factory Impression

Assembling Buildings in-Production Test-Research-Center


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