Choose The Right Polymer Lithium Battery Voltage For You +

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17 Years Factory

Founded in 2005, HOPPT Battery has been focusing on the lithium battery industry for 17 years. The company's R&D team has more than 60 professionals, including electrochemistry, process, structure, electronic engineers, etc., and has one-stop service capabilities in lithium battery products.

PCM Protection Board

PCM adopts high-precision imported Seiko chips, with overcharge, over-discharge, over-current, over-temperature, and short-circuit protection functions to ensure the safe operation of lithium batteries.

Terminals

Lithium battery connectors are world-renowned brands such as JST and Molex, which are greatly convenient for global users.

What is our customer comment

We are a manufactory of making differentiated flashlights. We want to have a lithium battery discharge at a low temperature of -40 ℃, this kind of low-temperature battery can solve the extreme cold weather normal use. We found Hoppt to customize the battery which can match our product’s small size and using in the unstable weather. Yes, they made it. First Class Hoppt.

Tabbart Basgall

The technical team designed a complete solution according to my requirements. I am satisfied with their professional answer to my series of questions. Thanks to all efforts Hoppt team.

I am a headband company, some users forgot to charge the headband after using it, so they couldn't use it the second time. They had to wait until it was fully charged, and the charging time is long. I tell the confusion to Hoppt, they suggest we use 2C quickly charging, now my customer wasn’t worried about the problem again.

  • Research & Designed Team

    1 01

    HOPPT has an advanced electrochemical laboratory, focusing on the research and development of high and low temperature, fast charging, and large-capacity batteries.

  • Manufacturing Facility

    2 01

    Automatic production equipment of famous lithium battery ensures high quality and performance consistency of lithium battery production.

  • Quality Control

    3 01

    Using advanced K value system and X-Ray testing equipment, incoming material inspection and production process control to ensure the high quality of products.

CUSTOMER PROTECTION

  • Certification
  • Manuafactory
CB
WERCS
TUV report
PSE certificate
ISO9001

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YOU MIGHT WANT TO KNOW

If you need any assitant please go to the contact page to find our information.

  • Q.

    Do you make customized products?

    Yes. We provide customers with OEM/ODM solutions. The OEM minimum order quantity is 1000 pieces.

  • Q.

    What kind of certificate do you have?

    We have ISO9001, CB, CE, UL, BIS, UN38.3, KC, PSE.

  • Q.

    How long is your sample production time?

    Two weeks (14 days).

  • Q.

    What are the payment terms?

    We generally accept 50% advance payment as a deposit and 50% before the delivery as the final payment. Other methods can be negotiated.

  • Q.

    What is the payment method?

    We accept payment via TT.

  • Q.

    What is your production capacity?

    120,000-150,000 pieces per day, each product has a different production capacity, you can discuss detailed information according to email.

  • Q.

    What is the electrochemical principle of a lithium polymer battery?

    The main component of the positive electrode of the lithium polymer battery is LiCoO2, and the negative electrode is mainly C. When charging, ; Cathode reaction: LiCoO2 → Li1-xCoO2 + xLi+ + xe- ; Negative reaction: C + xLi+ + xe- → CLix ; Overall cell reaction: LiCoO2 + C → Li1-xCoO2 + CLix ; The reverse reaction of the above reaction occurs during discharge.

  • Q.

    What are the main structural components of lithium polymer batteries?

    Lithium polymer battery uses file alloy as the positive electrode, polymer conductive material, polyacetylene, polyaniline, polyp-phenol as the negative electrode, and an organic solvent as an electrolyte, the specific energy of lithium polyaniline battery can reach 350W.h/kg, But the extraordinary power is only 50-60W/kg, the operating temperature is -40-70 degrees, and the service life is about 330 times.

  • Q.

    What is the nominal voltage?

    The nominal voltage of the lithium polymer battery refers to the voltage exhibited during regular operation, and the nominal voltage of the ternary lithium polymer battery is 3.6V.

  • Q.

    What is the capacity of a lithium polymer battery?

    The battery's capacity is divided into the rated power and the actual ability. The battery's rated capacity refers to the storm's design and manufacture that stipulates or guarantees that the battery should discharge the minimum amount of electricity under certain discharge conditions. The IEC standard specifies that the lithium-ion battery should be charged for 3 hours under the charging conditions of average temperature, constant current (1C)-constant voltage (4.2V), and then discharged at 0.2C to 2.75V as its rated capacity. The battery's actual capacity refers to the real power released by the storm under certain discharge conditions, which is mainly affected by the discharge rate and temperature (so strictly speaking, the battery capacity should specify the charge and discharge conditions). The unit of battery capacity is Ah, mAh (1Ah=1000mAh).

  • Q.

    What is the discharge platform of a polymer battery?

    The discharge platform of the lithium-ion polymer battery is generally the discharge time when the constant voltage is charged to a voltage of 4.2V and the current is less than 0.01C. The charge is stopped and left for 10 minutes to discharge to 3.6V at any current discharge rate. It is a necessary standard to measure the quality of the lipo battery.

  • Q.

    What are the packaging materials of polymer batteries?

    01) Non-dry meson (paper) such as fiber paper, double-sided tape 02) PVC film, trademark pipe 03) Connecting sheet: stainless steel sheet, pure nickel sheet, nickel-plated steel sheet 04) Lead-out sheet: stainless steel sheet (easy to solder), pure nickel sheet (spot welding is firm) 05) Plug class 06) Protection components such as temperature control switch, overcurrent protector, current limiting resistor 07) carton, carton 08) Plastic shell

  • Q.

    What are the main aspects of the performance of the so-called secondary lithium polymer battery?

    Mainly include voltage, internal resistance, capacity, energy density, internal pressure, self-discharge rate, cycle life, sealing performance, safety performance, storage performance, appearance, etc., and others include overcharge, over-discharge, corrosion resistance, etc.

  • Q.

    What are the safety test items for lithium polymer batteries?

    01) Short circuit test 02) Overcharge and over-discharge test 03) Withstand voltage test 04) Impact test 05) Vibration test 06) Heating test 07) Fire test 09) Variable temperature cycle test 10) Trickle charge test 11) Free drop test 12) low air pressure test 13) Forced discharge test 15) Electric hot plate test 17) Thermal shock test 19) Acupuncture Test 20) Crush test 21) Heavy object impact test

  • Q.

    What is pulse charging? What is the impact on battery performance?

    Pulse charging generally adopts the method of charging and discharging, that is, charging for 5 seconds and discharging for 1 second, so that it will reduce most of the oxygen generated during the charging process to electrolytes under the discharge pulse. It not only limits the vaporization of the internal electrolyte but also for those old batteries that have been severely polarized; after using this charging method for 5-10 times of charging and discharging, they will gradually recover or approach the original capacity.

  • Q.

    What is Lithium Polymer Battery Charging Efficiency?

    Charging efficiency refers to the degree to which the electrical energy consumed by the lithium polymer battery during charging is converted into the chemical energy that the lithium polymer battery can store. It is mainly affected by the lithium polymer battery process and the working environment temperature of the lithium polymer battery—generally, the higher the ambient temperature, the lower the charging efficiency.

  • Q.

    What is the output power of a lithium polymer battery?

    The output power of a lithium polymer battery refers to the ability to output energy per unit of time. It is calculated based on the discharge current I and the discharge voltage, P=U*I, in watts. The smaller the internal resistance of the lithium polymer battery, the higher the output power. The internal resistance of the lithium polymer battery should be less than the internal resistance of the electrical appliance. Otherwise, the energy consumed by the lithium polymer battery itself will be greater than the power consumed by the electrical device. Uneconomical and may damage Li-polymer batteries.

  • Q.

    What is a 24-hour self-discharge test?

    The self-discharge test of lithium polymer battery is: generally use 24-hour self-discharge to test its charge retention capability quickly, discharge the battery to 3.0V at 0.2C, charge to 4.2V at constant current and constant voltage 1C, cut-off current: 10mA, After leaving it for 15 minutes, discharge the battery at 1C to 3.0V to measure its discharge capacity C1, then charge the battery with constant current and constant voltage 1C to 4.2V, cut-off current: 10mA, and estimate the 1C capacity C2 after leaving it for 24 hours, C2/C1*100% Should be more significant than 99%.

  • Q.

    What is static resistance? What is dynamic resistance?

    The static internal resistance is the battery's internal resistance during discharge, and the dynamic internal resistance is the battery's internal resistance during charging.

  • Q.

    .What is the standard charge retention test?

    The national standard stipulates that the standard charge retention test for lithium polymer batteries is: (IEC has no relevant standards) the battery is discharged to 3.0/unit at 0.2C, then charged to 4.2V at 1C constant current and constant voltage, and the cut-off current is 10mA. At 20℃±5℃, after 28 days of storage, discharge to 2.75V at 0.2C, calculate the discharge capacity and then compare it with the nominal power of the lithium polymer battery, which should not be less than 85% of the initial total.

  • Q.

    What are the high temperature and high humidity tests?

    The high temperature and high humidity test of lithium polymer battery is: (national standard) Charge the lithium polymer battery with 1C constant current and constant voltage to 4.2V, the cut-off current is 10mA, and then put it in a continuous temperature and humidity box with a relative humidity of 90%-95% at (40±2) °C for 48 hours and then put the lithium polymer Take out the lithium polymer battery and put it on hold for 2 hours at (20±5)℃, observe that the appearance of the lithium polymer battery should be standard, then discharge it to 2.75V at a constant current of 1C, and then carry out 1C under the condition of (20±5)℃ Charge and discharge at 1C until the discharge capacity is not less than 85% of the initial total. Still, the number of cycles is no more than three times.

  • Q.

    How do you package the products?

    We pack by United Nations regulations, and we can also provide special packaging according to customer requirements.

  • Q.

    Do you provide free samples?

    We provide batteries with a power not exceeding 10WH as free samples.

  • Q.

    How long does it take to produce?

    About 35 days. The specific time can be coordinated by email.

  • Q.

    What are the delivery terms?

    We provide: FOB and CIF.

  • Q.

    Which markets have you sold in?

    We have transported goods to Northern Europe, Western Europe, North America, Middle East, Asia, Africa, and other places.

  • Q.

    What is a lithium polymer battery?

    A lithium polymer battery, also known as a polymer lithium ion battery, is a chemical battery. Lithium polymer batteries have ultra thin characteristics and can be made into batteries of different shapes and capacities to meet the needs of some products. The theoretical minimum thickness can reach 0.5mm.

  • Q.

    What are the commonly used standards for lithium polymer batteries?

    Commonly used IEC standards for batteries: The lithium polymer battery industry is generally based on UL or national standards. Commonly used national standards for batteries: The criteria for lithium polymer batteries are GB/T10077_1998, YD/T998_1999, and GB/T18287_2000. In addition, the commonly used standards for batteries also include the Japanese Industrial Standard JIS C standards for batteries. The International Electrical Commission, IEC is a worldwide organization for standardization composed of electrotechnical commissions of various countries. Its purpose is to promote the standardization of the world's electrical and electronic fields. IEC standards are standards developed by the International Electrotechnical Commission.

  • Q.

    What is the internal resistance of a lithium polymer battery?

    Refers to the resistance of the current flowing through the battery when the lithium polymer battery is working. It consists of ohmic internal resistance and polarization internal resistance. The significant internal resistance of the battery will cause the battery discharge working voltage to decrease and the discharge time to be shortened. The internal resistance is mainly affected by battery material, manufacturing process, and battery structure. It is an important parameter to measure battery performance. Note: Generally, the internal resistance in the charging state is used as the standard. The battery's internal resistance needs to be reckoned with a unique internal resistance meter, not with the ohm gear.

  • Q.

    What is open circuit voltage?

    The open-circuit voltage refers to the potential difference between the positive and negative electrodes of the battery when the battery is non-working, that is when there is no current flowing through the circuit. The working voltage, also known as the terminal voltage, refers to the potential difference between the positive and negative electrodes of the battery when the battery is working, that is, when there is current in the circuit.

  • Q.

    What is the residual discharge capacity of polymer lithium batteries?

    When the lithium polymer battery is discharged with a large current (such as 1C or above), due to the "bottleneck effect" of the internal diffusion rate due to the excessive current, the battery has reached the terminal voltage when the capacity is not fully discharged, and then a small current is used. If 0.2C can continue to discharge, the capacity released when it reaches 3.0V/pc (lithium battery) is called residual capacity.

  • Q.

    What is the marking method for rechargeable polymer batteries specified by IEC?

    According to the IEC61960 standard, the identification of secondary lithium polymer batteries is as follows: 01) Polymer battery identification composition: 3 letters followed by five numbers (cylindrical) or 6 (square) numbers. 02) The first letter: Indicates the harmful electrode material of the polymer lithium battery. I—represents lithium ions with built-in batteries; L—represents lithium metal or alloy electrodes. 03) The second letter: Indicates the positive electrode material of the lithium battery. C—Cobalt-based electrode; N—Nickel-based electrode; M—Manganese-based electrode; V—Vanadium-based electrode. 04) The third letter: Indicates the shape of the battery. R—represents a cylindrical battery; L—represents a square battery. 05) Numbers: Cylindrical battery: 5 numbers indicate the diameter and height of the battery, respectively. Diameter is in millimeters, and size is in tenths of a millimeter. When any dimension of diameter or height is greater than or equal to 100mm, it should add a diagonal line between the two sizes. Square battery: 6 numbers indicate the thickness, width, and height of the battery in millimeters. When any of the three dimensions is greater than or equal to 100mm, it should add a slash between the dimensions; if any of the three dimensions is less than 1mm, it should add the letter "t" before the size, and the unit of this dimension is one-tenth of a millimeter. For example: ICR18650 represents a cylindrical secondary lithium-ion battery. The positive electrode material is cobalt. Its diameter is about 18mm. Its height is about 65mm. ICR20/1050. ICP083448 represents a square secondary lithium-ion battery; the positive electrode material is cobalt, the thickness is about 8mm, the width is about 34mm, and the height is about 48mm. ICP08/34/150 represents a square secondary lithium-ion battery; the positive electrode material is cobalt, the thickness is about 8mm, the width is about 34mm, and the height is about 150mm. ICPt73448 represents a square secondary lithium-ion battery; the positive electrode material is cobalt, the thickness is about 0.7mm, the width is about 34mm, and the height is about 48mm.

  • Q.

    What is the purpose of lithium polymer battery packaging, combination, and design?

    01) Beautiful brand 02) The battery voltage is limited. To obtain a higher voltage, multiple batteries need to be connected in series 03) Protect the battery, prevent short circuits and prolong battery life 04) Size restrictions 05) Easy to transport 06) Design of special functions, such as waterproof, unique appearance design, etc.

  • Q.

    What are the reliability test items for polymer batteries?

    01) Cycle life 02) Discharge characteristics at different rates 03) Discharge characteristics at different temperatures 04) Charging characteristics 05) Self-discharge characteristics 06) Storage characteristics 07) Over-discharge characteristics 08) Internal resistance characteristics at different temperatures 09) Temperature cycle test 10) Drop test 11) Vibration test 12) Capacity test 13) Internal resistance test 14) GMS test 15) High and low-temperature impact test 16) Mechanical shock test 17) High temperature and high humidity test

  • Q.

    How to charge the lithium polymer battery

    Constant current and voltage charging: The lithium polymer battery is first charged with a constant current (CC). When the voltage of the polymer lithium battery rises to a specific value, the voltage remains unchanged (CV), and the wind in the circuit decreases to a minimal value and eventually tends to increase at 0.

  • Q.

    What is trickle charging?

    Trickle charging is used to compensate for the battery's capacity loss due to self-discharge after being fully charged. Generally, pulse current charging is used to achieve the above purpose.

  • Q.

    What is the discharge efficiency of lithium polymer batteries?

    Discharge efficiency refers to the ratio of the amount of electricity released to the rated capacity from discharge to the terminal voltage under certain discharge conditions, mainly affected by factors such as discharge rate, ambient temperature, internal resistance, etc. The higher the discharge rate, The lower the discharge efficiency. The lower the temperature, the lower the discharge efficiency.

  • Q.

    What is the self-discharge of secondary lithium polymer battery?

    Self-discharge, also known as charge retention capability, refers to the retention capability of the battery's stored power under certain environmental conditions in an open-circuit state. Generally, self-discharge is mainly affected by the manufacturing process, materials, and storage conditions. Self-discharge is one of the main parameters to measure battery performance. Generally speaking, the lower the battery storage temperature, the lower the self-discharge rate. However, it should also note that too low or too high a temperature may cause the battery to be damaged and unusable. After the battery is fully charged and left open for some time, it is normal for a certain degree of self-discharge.

  • Q.

    What is the difference between charge state internal resistance and discharge state internal resistance?

    The internal resistance in the charging state refers to the battery's internal resistance when it is 100% fully charged; the internal resistance in the discharging form refers to the internal resistance after the battery is fully discharged. Generally speaking, the internal resistance in the discharge state is not stable and too large. In contrast, the internal resistance in the charging state is small, and the resistance value is relatively stable. Only the internal resistance in the charging state has practical significance during the use of the battery. In the later period of the battery use, due to the exhaustion of the electrolyte and the reduction of the activity of the internal chemical substances, the internal resistance of the battery will increase to varying degrees.

  • Q.

    What is the internal pressure of the battery?

    Refers to the internal air pressure of the battery, which is caused by the gas generated during the charging and discharging process of the sealed battery and is mainly affected by factors such as battery material, manufacturing process, and battery structure. The main reason is that the gas generated by the decomposition of moisture and organic solution inside the battery accumulates in the battery. Generally, the battery's internal pressure is maintained at an average level. In the case of overcharge or over-discharge, the internal pressure of the battery may increase: For example, overcharge, positive electrode: 4OH- - 4e → 2H2O + O2↑; ① The generated oxygen reacts with the hydrogen evolved on the negative electrode to form water 2H2 + O2 → 2H2O ② If the speed of reaction ② is lower than that of reaction ①, the generated oxygen will not be consumed in time, which will cause the internal pressure of the battery to rise.

  • Q.

    What is a short circuit experiment?

    Connect the fully charged battery with an internal resistance ≤100mΩ wire in the explosion-proof box to short-circuit the positive and negative electrodes. The battery should not explode or catch fire.

  • Q.

    What is a temperature rise experiment?

    Fully charge the lithium polymer battery and put it in the oven, start to heat up from room temperature at a rate of 5°C/min, and keep it for 30 minutes when the oven temperature reaches 130°C. The battery should not explode or catch fire.

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