18650 48V 20Ah Lithium ion Battery Pack with BMS

Additional information

Rated Voltage

39V

Rated Capacity

20Ah

Battery Size

70*150*260mm

Charge Temperature

0-45℃

Discharge Temperature

-20~60℃

Application

ebike

Lithium Battery Process Work Flow

We are a professional lithium battery factory in China. Now we briefly introduce how to produce lithium batteries. It starts from cathode & anode mixing, coating, baking, calendering, automatic slitting & cutting, winding, top & side sealing, electrolyte injection, pressing formation, forming, capacity grading, OCV1 & OVC2, cell to PCB, insulation and shipping. Welcome to contact and ask for the workflow table list.

Product Details

Product number: HLC4820
Cell model: 18650/3.7V/2000mAh
Battery specification: 18650-13S10P/48V/20Ah(lithium battery)
Nominal voltage: 48V
Nominal capacity: 20Ah
Charging voltage: 54.6V
Charging current: ≤20A
Discharging current: ≤20A
Instant discharging current: 40A
End-off voltage: 39V
Internal resistance: ≤550mΩ
Battery weight: 6,500g
Product dimension: 70*150*260mm
Charging temperature:0~45℃
Discharging temperature: -20~60℃
Storage temperature: -20~45℃
Battery case: Aluminum plastic pouch cell
Application field: ebike

Lithium battery features:

Hardware output: 4P wires to one male connector, such as JST, ZHR, Molex etc, it will easily insert into female connector at main board;

Data communication management: Seiko IC+TI software management chip, precise data transmission, and precise temperature control are used to eliminate potential safety hazards to the greatest extent.

The battery adopts imported Samsung brand or Chinese brand cells, the battery pack is safe and has a long cycle life;

The battery pack has a high cycle retention rate, which is in line with the value concepts of low carbon, energy-saving, and environmental protection;

Flexible shape design: it is a 13S10P battery pack, so its total 130 sets into one set. It can be arranged different cells inside to meet customer demands.

18650 Battery Pack advantages:

  1. Large capacity
    If combined into a 18650 lithium-ion battery pack, the 18650 lithium-ion battery pack can easily break through 5Ah, 10Ah, and more.
  2. Long lifespan
    The 18650 lithium-ion battery pack has a long service life, with a cycle life of more than 500 times in normal use, which is more than twice that of ordinary batteries.
  3. High safety performance
    18650 lithium-ion battery pack has high safety performance, no explosion, no burning; non-toxic, non-polluting, certified by RoHS trademark.
  4. Wide range of applications
    18650 lithium-ion battery packs are widely used in notebook computers, walkie-talkies, portable DVDs, instrumentation, audio equipment, model aircraft, toys, video cameras, digital cameras and other electronic equipment.
  5. Series combination
    It can be combined in series or parallel to form 18650 lithium-ion battery packs.
  6. High voltage
    The voltage of 18650 lithium-ion battery packs is generally 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of nickel-cadmium batteries and nickel-hydrogen batteries.

FAQ:

  • Why are the voltages inconsistent and individually low?
    1. Large self-discharge causes low voltage; The self-discharge of the cell is large so that its voltage decreases faster than others. The low voltage can be eliminated by checking the voltage after storage.2. Uneven charge causes low voltage; When the battery is charged after detection, uneven charging of the cells is caused by inconsistent contact resistance or the charging current of the detection cabinet. The voltage difference is small in short-term storage (12 hours), but the voltage difference is large in long-term storage. This low voltage has no quality problem and can be solved by charging.
  • Why is the internal resistance of the battery pack too high?
    1. Detecting equipment differences; If the detection accuracy is not enough or the contact electric group cannot be eliminated, it will cause the display of internal resistance to be too large. The AC bridge method should be used to test the internal resistance instrument.2. Storage time too long; Lithium batteries are stored for too long, resulting in excessive capacity loss, internal passivation, and increased internal resistance, which can be solved by charging and discharging activation.3. Abnormal heat causes large internal resistance; The processing of the battery cell (spot welding, ultrasonic wave, etc.) causes the battery to be abnormally heated, which causes the thermal closure of the diaphragm, and the internal resistance increases seriously.
  • There are generally the following situations when a battery explodes:
    1. Overcharge explosion; The protection circuit is out of control or the detection cabinet is out of control, so that the charging voltage is greater than 5V, causing the electrolyte to decompose, a violent reaction occurs inside the battery, the internal pressure of the battery rises rapidly, and the battery explodes.2. Overcurrent explosion; The protection circuit is out of control or the detection cabinet is out of control, so that the charging current is too large, causing lithium ions to be embedded too late, and lithium metal is formed on the surface of the pole piece, penetrating the diaphragm, and the positive and negative electrodes are directly short-circuited to cause an explosion (rarely).3. Explosion while ultrasonically welding plastic enclosures; When ultrasonic welding plastic shells, due to equipment reasons, the ultrasonic energy is transferred to the battery core. The ultrasonic energy is very large and the internal diaphragm of the battery is melted, and the positive and negative electrodes are directly short-circuited, resulting in an explosion.4. Explosion during spot welding; Excessive current during spot welding causes serious internal short circuits and explosions. In addition, during spot welding, the positive connection piece is directly connected to the negative electrode, so that the positive and negative electrodes are directly short-circuited and then exploded.5. Over-discharge explosion; Over-discharge or over-current discharge (above 3C) of the battery can easily dissolve the negative electrode copper foil and deposit it on the separator, causing the positive and negative electrodes to be directly short-circuited and explode (rarely).6. Explosion when dropped by vibration; The internal pole pieces of the battery cell are dislocated when the battery cell is vibrated or dropped, and the battery is directly short-circuited and exploded (rarely).

 

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