What are the advantages of the soft pack rectangle battery?

 

The main advantages of rectangular pouch batteries are their thin profile and efficient use of space. The slim rectangular shape adds to better layering and increased flexibility, and they are commonly found in a variety of small electronic devices.

Table of Contents

8 Advantages of choosing rectangular batteries

Li-ion battery pack flexibility

This is a fully assembled battery pack with a built-in BMS as the standard battery module. The modules are assembled in a parallel configuration to increase capacity and in a series, configuration to increase voltage. The built-in BMS can provide an output cable for communication.

Long cycle life

We randomly selected a rectangular pouch cell from our production line. After constant cycling and equivalent acceleration of more than 4400 charging cycles, the 10Ah battery still recorded about 9Ah. After repeated charging, the battery capacity was only reduced by about 10%.

Reliability

When one rectangular pouch battery fails, the other rectangular pouch battery can simply take over. When you replace a single faulty rectangular pouch battery, the rest of the system can continue to operate normally, thus improving system reliability.

Improved energy storage

Compared to a cylindrical battery, a soft-packed rectangular battery has a much larger capacity to store energy in a given physical space.

Safety

When a cylindrical cell has internal problems, the pressure increases and expands. In those uncommon instances, a soft-packed rectangular battery will only expand.

On the other hand, cylindrical batteries are housed in a steel sleeve. When pressure builds up in a cylindrical battery, the end of the cylindrical battery will be secured by another battery or case and may explode, thus posing a safety hazard.

Weight

Generally, the weight of a soft-pack rectangular battery is less than the weight of an equivalent cylindrical battery. Flat soft-pack rectangular cells have a greater energy density than other battery shapes, but they are also much more difficult to manufacture. For this reason, soft-pack rectangular batteries are one of the best products to test a battery manufacturer‘s production capabilities and techniques.

Consistency Rectangular Pouch Batteries

GREPOW‘s entire line of pouch rectangular cells are manufactured on automated equipment using stacking technology. The cells are manually tested to ensure that each cell is up to par, eliminating human error in manual cells and making each cell uniform.

The growing trend of rectangular pouch batteries

As the economy grows, the utilization of soft-packed rectangular batteries continues to rise. Low internal resistance and long battery life reduce the additional cost of battery replacements for customers, which makes these batteries ideal for wearables, smartphones, speakers, and other 3C products.

There is also a growing interest in the safety and energy-density benefits of pouch batteries. The penetration rate of soft-pack batteries in more areas will gradually come to increase.

If you are interested in our products, please don’t hesitate to contact us:

Email: info@grepow.com

Grepow Website: https://www.grepow.com/

Novel Batteries are Needed in this 5G Era

 

I believe that many people have encountered the embarrassing situation of insufficient mobile phone battery power and unable to find a place to recharge when they were out for fun or shopping.

With the advent of the 5G communication era, a new generation of consumer electronic products is developing rapidly. Behind the innovation of high-speed, large-capacity, and low-latency communication technology, the demand for equipment carrying power will also increase.

So, in the face of the current rising demand for power-carrying equipment, what new research developments are there in lithium battery technology suitable for consumer electronic devices? Where will the future direction of battery technology innovation go?

Next, GREPOW Battery will share with you the challenges and subversions of consumer electronic battery technology brought about by the arrival of the 5G communication era.

the IoT is inseparable from strong “power” in the 5G era

Tablet computers, Bluetooth speakers, smartphones, consumer robots… the types of consumer electronic products continue to increase. On the one hand, the emergence of these consumer products brings people a real and convenient experience; on the other hand, people will often The actual users who have seen such products complain that the products are unsatisfactory in one way or another.

The advent of the 5G era is not just about changing network speeds as simple as a series of power support systems. If the Internet connects people and things more closely, then the arrival of the 5G era will not only increase the speed of this connection but also enable basic coordination between things.

The mobile phone is out of power and meets an emergency. At this time, we especially hope to have a mobile phone battery with a lot of power. At present, most of the batteries used in mobile electronic products such as mobile phones and tablet computers on the market are mostly lithium-ion batteries. Although designers have been using various methods to increase the capacity of the batteries, they are in line with the rapid innovation of consumer electronics. Compared, it still makes people feel more exhausted.

The 5G era of the Internet of Everything will undoubtedly drive the demand for hardware performance of various mobile devices, including mobile phones, wearable electronic products, Internet of Things devices, drones, and so on. In this context, whether the battery’s endurance can support the high-speed computing demand brought by 5G will be an important issue worthy of attention.

Industrial innovation requires novel batteries

Currently, the more mature battery in the 3c market is lithium cobalt oxide, which is also the most widely used cathode material in the consumer electronics market. At present, the mainstream commercial lithium battery cathode materials on the market mainly include lithium cobalt oxide, lithium manganate, lithium iron phosphate, ternary materials (lithium nickel cobalt manganate, lithium nickel cobalt aluminate), etc. The latter three main requirements In power batteries, lithium cobalt oxide is more used in consumer electronics.

For consumer electronic batteries, the input and output performance of lithium-ion batteries mainly depends on the structure and performance of the internal materials of the battery, including negative electrode materials, electrolytes, separators, and positive electrode materials. The lithium cobalt oxide battery has the advantages of high specific gravity, high volume, and high energy density, so it has become the best choice for consumer electronic products.

However, with the advent of the 5G era, consumer electronics products continue to introduce new ones, and people’s demand for battery capacity is also rising linearly, requiring battery products with greater flexibility, longer running time, lower cost, and higher Security. The characteristics of consumer electronic devices have also put forward more stringent requirements on the new generation of battery technology. The contradiction between the continuous miniaturization of the volume and the battery capacity, the contradiction between the charging and discharging speed and the number of charging and discharging, etc. are all urgently needed to be resolved. The problem.

For companies, in addition to working hard on the stability and service life of batteries under the current technical framework, they also need to have a forward-looking sense of technological revolution and continue to increase the exploration and research of new materials and novel battery technologies. Be invincible when 5G comes.

In addition, as the new consumer electronics industry represented by wearable devices continues to increase, the demand for consumer lithium batteries is also increasing. Wearable devices usually use solid-state lithium battery ultra-thin battery technology. The technology and craftsmanship are basically mature, such as wearable devices such as bank cards, VR, and bracelets. According to the forecast of iiMedia Consulting, the demand for lithium batteries in the VR industry alone is expected to exceed 55 billion yuan by 2020.

Revolutionary battery technology

When it comes to the future of consumer lithium batteries, there will be two major development trends: one is technological innovation, such as increasing research on the replacement of positive and negative materials, to meet the dual requirements of consumer users for battery volume and capacity; the second is safety Performance requires a more cautious attitude when new high-capacity, high-density battery technologies move from the laboratory to the commercial market.

At present, in order to meet the user’s demand for battery life indicators on the market, the current consumer electronics merchants themselves are also trying to improve the battery experience from many aspects, such as fast charging technology. GREPOW batteries have excellent performance in this area and can be achieved 3C and 5C fast charge.

Fast charging technology uses a high-voltage current. By increasing the charging voltage, the charging rate of the device is finally increased, thereby shortening the charging time of the device, and thus the charging speed has been significantly improved.

In addition to fast charging technology, GREPOW’s new novel shaped batteries can be customized according to your device. The special shape can make full use of the space of the device, thereby increasing the battery capacity.

With the advent of the 5G era, high-definition audio-visual calls and high-power IoT applications will inevitably add unimaginable pressure to consumer electronics such as mobile phones. On the eve of the urgent need for systematic changes in battery technology, in addition to the fast-charging technology and special-shaped novel batteries just mentioned, it is also necessary to try new models to solve the problem of device battery life.

If you are interested in our products, please don’t hesitate to contact us at any time!
Email: info@grepow.com
Grepow Website: https://www.grepow.com/

How are Specialty LiPo Batteries Made?

 

Grepow’s Lithium-ion polymer (LiPo) batteries can be specially made to be ultra-small, curved, and ultra-thin–the possibilities are endless! With factories in China that specialize in battery production, Grepow has only continued to grow and work to keep to the high performance expected of its batteries.

We will briefly explore some aspects of the production method of how thesespecialty LiPo batteriesare made at Grepow’s factories.

Temperature and humidity

In South China, the temperatures and humidity levels tend to be high, so it is especially important to strictly regulate the temperature and humidity of the production workshop. There are certain requirements that must be met by Grepow’s batteries, and these vary depending on the requirements of each cell and design. Some examples include performing under extremely high or low temperatures or fast charging.

Air conditioners and dehumidifiers must also be set in the factories.  These machines run for a longer period of time particularly when the electrodes are baked so as to remove any excess moisture.  Low-power industrial dehumidifiers are used during the liquid injection process.

Moreover, our factories are equipped with large-scale industrial dehumidifiers manufactured in Switzerland. Each workshop is thoroughly sealed, and the temperature and humidity are centrally controlled. The cost of only one floor of the workshop is 10 times that of an ordinaryLiPo batteryproduction workshop.

Blender

The battery materials need to be stirred evenly without any air bubbles.  Grepow goes a step forward by continuing to maintain the humidity and temperature during high-speed mixing.

Coating machine

GrepowLiPo batteries must have strong endurance and uniform capacity. This depends on the material coating on both sides of the cathodes and anodes being uniform.

Roller

In order to further ensure the consistency of battery life and capacity, it is necessary to further increase the energy density of the cathodes and anodes.

Two pairs of large rollers weigh 12 tons. Under the control of the computer, the gap between the two wheels can be adjusted at any time. The thickness error of the extruded film is 0.0001 mm, ensuring that each battery has the same high capacity density.

After Grepow batteries are produced, they must not only undergo high-temperature aging but also withstand 95% relative humidity at high temperatures. Our engineers also carry out multiple safety tests before packing items for shipment.

Feel free to look through our myriad of specialty items: our high- or low-temperature battery, our quick-charge battery, ourspecial-shaped batteries, and many more!

If you are interested in any Grepow specialty batteries, contact us atinfo@grepow.com.

Multifunctional Lithium Battery Testing

  With the increasing applications of lithium-ion batteries in drones, electric vehicles (EV), and solar energy storage, battery manufacturers are using modern technology and chemical composition to push the limits of battery testing and manufacturing capabilities.

Nowadays, every battery, regardless of its size, performance, and life, is determined in the manufacturing process, and the testing equipment is designed around specific batteries. However, since the lithium-ion battery market covers all shapes and capacities, it is difficult to create a single, integrated testing machine that can handle different capacities, currents, and physical shapes with required accuracy and precision.

As the demand for lithium-ion batteries becomes more diversified, we urgently need high-performing and flexible testing solutions to maximize the pros and cons and achieve cost-effectiveness.

The complexity of a lithium-ion battery

Today, lithium-ion batteries come in a variety of sizes, voltages, and applications that were originally not available when the technology was first put on the market. Lithium-ion batteries were originally designed for relatively small devices, such as notebook computers, cell phones, and other portable electronic devices.

Now, they’re a lot bigger in size for such devices as electric cars and solar battery storage. This means that a larger series, the parallel battery pack has a higher voltage, larger capacity, and larger physical volume. Some electric vehicles can have up to 100 pieces of cells in series and more than 50 in parallel.

A typical rechargeable lithium battery pack in an ordinary notebook computer consists of multiple batteries in series. However, due to the larger size of the battery pack, the testing becomes more complicated, which may affect the overall performance.

In order to achieve the best performance of the entire battery pack, each battery must be almost the same as its adjacent cells. Batteries will affect each other: if one of the batteries in a series has a low capacity, the other batteries in the battery pack will be below the optimal state. Their capacity will be degraded by the battery monitoring and rebalancing system to match the battery with the lowest performance.

The charge-discharge cycle further illustrates how a single battery can degrade the performance of the entire battery pack. The battery with the lowest capacity in the battery pack will reduce its charging state at the fastest speed, resulting in an unsafe voltage level and causing the entire battery pack to be unable to discharge again.

When a battery pack is charged, the battery with the lowest capacity will be fully charged first, and the remaining batteries will not be charged further. In electric vehicles, this will result in a reduction in the effective overall available capacity, thereby reducing the vehicle’s range. In addition, the degradation of a low-capacity battery is accelerated because it reaches an excessively high voltage at the end of its charge and discharge before the safety measures take effect.

No matter the device, the more batteries in a battery pack that is stacked in series and in parallel, the more serious the problem.

The obvious solution is to ensure that each battery is manufactured exactly the same and to keep the same batteries in the same battery pack. However, due to the inherent manufacturing process of battery impedance and capacity, testing has become critical–not only to exclude defective parts but also to distinguish which batteries are the same and which battery packs to put in.

In addition, the charging and discharging curve of the battery in the manufacturing process has a great impact on its characteristics and is constantly changing.

Modern lithium-ion batteries bring new testing challenges

Battery testing is not a new thing, but, since its advent, lithium-ion batteries have brought new pressure to the accuracy of testing equipment, production capacity, and circuit board density.

Lithium-ion batteries are unique because of their extremely dense energy storage capacity, which may cause fires and explosions if they are improperly charged and discharged. In the manufacturing and testing process, this kind of energy storage technology requires very high accuracy, which is further aggravated by many new applications. The wide range of lithium-ion batteries that are available affects the testing equipment as they need to ensure that the correct charge and discharge curve is followed accurately in order to achieve the maximum storage capacity and reliability and quality.

Since there is no one size suitable for all batteries, choosing suitable test equipment and different manufacturers for different lithium-ion batteries will increase the test cost.

In addition, continuous industrial innovations mean that the constantly changing charge-discharge curve is further optimized, making the battery tester an important development tool for new battery technology. Regardless of the chemical and mechanical properties of lithium-ion batteries, there are countless charging and discharging methods in their manufacturing process, which pushes battery manufacturers to expect more unique test functions out of battery testers.

Accuracy is obviously a necessary capability. It not only refers to the ability to keep high current control accuracy at a very low level but also includes the ability to switch very quickly between charging and discharging modes and between different current levels. These requirements are not only driven by the need to mass-produce lithium-ion batteries with consistent characteristics and quality but also by the hope to use testing procedures and equipment as innovative tools to create a competitive advantage in the market.

Although a variety of tests are required for different types of batteries, today’s testers are optimized for specific battery sizes. For example, if you are testing a large battery, a larger current is required, which translates to larger inductance, thicker wires, etc. So many aspects are involved when creating a tester that can handle high currents.

However, many factories do not only produce one type of battery. They may produce a complete set of large batteries for a customer while meeting all the test requirements for these batteries, or they may produce a set of smaller batteries with a smaller current for a smartphone customer.

This is the reason for the rising cost of testing–the battery tester is optimized for the current. Testers that can handle higher currents are generally larger and more expensive because they not only require larger silicon wafers but also magnetic components and wiring to meet electromigration rules and minimize voltage drops in the system. The factory needs to prepare a variety of testing equipment at any time to meet the production and inspection of various types of batteries. Due to the different types of batteries produced by the factory at different times, some testers may be incompatible with specific batteries and may be left unused.

Whether it is for today’s emerging factories for mass production of ordinary lithium-ion batteries or for battery manufacturers who want to use the testing process to create novel battery products, flexible test equipment must be used to adapt to a wider range of batteries’ capacity and physical size, thereby reducing capital investment and improving the return on investment.

The maximum investment in lithium-ion battery testing equipment

There will always be a need for unique battery test scenarios, which require equally unique solutions. However, for many types of lithium batteries, whether they be small smartphone batteries or a large battery pack for an electric car, there can be cost-effective testing equipment.

GREPOW‘s modular battery tester solves the problems of high accuracy, high current, and flexibility of lithium-ion battery testing equipment. The company covers a variety of available battery shapes, sizes, and capacities and can cope with emerging applications, such as large battery packs and small-sized batteries commonly found in consumer electronics products, like smart bracelets.

The reference design for lithium-ion battery testing enables companies to invest in lower current battery testing equipment and use them in parallel, thus eliminating the need for expensive investments in multiple machines with different current levels. The ability to use testing equipment in a variety of current ranges can optimize the investment in the machinery, thereby reducing the total costs and allowing for adaptability to the changing needs of lithium-ion battery testing.

If you are interested in our products, please don’t hesitate to contact us at any time!
Email: info@grepow.com
Grepow Website: https://www.grepow.com/

3 types of low-temperature lithium batteries that you need to know

 

Low-temperature lithium-ion batteries mainly include low-temperature lithium-ion polymer (LiPo) batteries, low-temperature 18650 batteries, and low-temperature lithium iron phosphate (LiPO4) batteries.  We will explore the advantages and disadvantages of each one.

Low-temperature lithium polymer batteries

Low-temperature LiPo batteries have the best low-temperature performance especially in smart wearable devices, where the advantages are more prominent.

Performance characteristics

Grepow’s LiPo batteries can be made to operate in environments with low-temperatures of -50℃ to 50℃. Under low-temperatures, the batteries can achieve a lower internal resistance and, thus, a high discharge rate. Compared with traditional lithium polymer batteries, Grepow’s batteries have broken through the discharge temperature limits of -20℃ to 60℃.

They are able to discharge over 60% efficiency at 0.2C at -40℃ and discharge over 80% efficiency at 0.2C at -30℃. When charged at 20℃ to 30℃ by 0.2C, the capacity can maintain above 85% after 300 cycles. The batteries can be ready for mass production, and they have been widely used in cold climates and military products.

Shape advantage

With stacking technology, battery shapes can be widely customized, which allows for more flexibility and space within products. We can also create small and ultra-thin batteries with low-temperature characteristics used in special fields or professional smart equipment.

Weight advantage

Under the same voltage and capacity conditions, low-temperature lithium-ion polymer batteries and low-temperature lithium iron phosphate batteries are lighter than low-temperature 18650 batteries. However, LiPo batteries are the most expensive in terms of production and manufacturing costs, which is one of the important factors limiting its use in some application areas.

Low-temperature 18650 lithium-ion batteries

Low-temperature 18650 lithium-ion batteries mainly consist of liquid electrolytes. these cylindrical batteries with steel shells have fixed dimensions, which means that their shape and size are fixed as well. The largest capacity is currently 3300mAh, which can only be achieved by a limited number of manufacturers.

Characteristics

At temperatures between -40℃ to 60℃, the effective discharge capacity is 40% to 55%, and the effective cycle life is more than 180 cycles.  At temperatures between -30℃ to 65℃ at 0.2C discharge, the effective discharge capacity is above 65%. At 1C rate discharge, the discharge capacity is above 60%, and the cycle life comes out to more than 200 cycles.

At temperatures between -20℃ to 75℃, the effective discharge capacity is more than 80%, and the cycle life is more than 300 cycles.

Due to the fixed performance and size of the battery, there is limited use for this battery, but its production and manufacturing costs are relatively low.

Low-temperature lithium iron phosphate batteries

Low-temperature LiPO4 batteries have two kinds of packaging cases: one is a steel case, which is currently mostly used in new energy batteries, such as energy-storage batteries and new energy vehicle batteries; the other is a soft-pack LiPO4 battery with aluminum plastic film for the outer packaging.

The performance of this battery is basically the same as that of the LiPo battery. However, the low-temperature performance of LiPo batteries is better than that of 18650 batteries. The development of LiPO4-battery technology has not been long, and the requirements for production equipment are relatively high.

If you are interested in our products, you can directly contact us at info@grepow.com

Grepow Website: https://www.grepow.com/

The charging voltage of 3.7V lithium battery

 

The 3.7v lithium battery is a lithium battery with a nominal voltage of 3.7v and a full-charge voltage of 4.2v. Its capacity ranges from several hundred to several thousand mAh. It is generally used in various instruments and meters, testing instruments, medical instruments, POS machines, notebook computers, and other products.

About the capacity of 3.7V lithium battery capacity, the larger the volume of a single lithium battery, the greater the capacity, or we can say that the more the number of lithium batteries in parallel, the greater the capacity.

Generally, a 3.7v lithium battery needs a “protection board” for over-charging&discharging. The battery without a protection board can only be charged with 4.2V voltage, because the ideal full charge voltage of a lithium battery is 4.2v, once the voltage exceeds 4.2v, the battery may be damaged. Charging in this way requires someone to monitor the condition of the battery at all times.

On the contrary, the battery with a protection board can be charged with 5V (range from 4.8V to 5.2V). As we know, in most cases, a 5V charger can be used for USB of computers and mobile phones.

The charging cut-off voltage of 3.7V battery is 4.2V and the discharge cut-off voltage is 3.0V.  Therefore, when the open-circuit voltage of the battery is lower than 3.6V, it should be able to charge. It is better to use the 4.2V constant voltage charging mode, so you don’t need to pay attention to the charging time. If 5V charging is used, overcharging is easy to happen.

1. Floating Charge

Floating charging means that the device is being charged while being used. This method is often used in standby power supply situations. When the voltage is lower than 12V, the equipment can not be charged. At the same time, if the voltage is too high, the circuit will be affected. Therefore, the voltage of the floating charge is 13.8V.

2. Cycle Charging

Cycle charging refers to the full charge to restore the capacity of the battery. When the battery is fully charged, it is measured without disconnecting the charger. At this time, the voltage is generally around 14.5V, and the maximum voltage will not exceed 14.9V. After disconnecting the charger for 24 hours, the voltage will generally be around 13V to 13.5V. After one week, it will be dropped to 12.8v ~ 12.9v. The specific voltage value of different batteries is different.

The nominal voltage of lithium battery is 3.7V and the charging voltage is 4.2V. The nominal voltage of batteries in series is only 7.4v, 11.1v, 14.8V…  which corresponds to the charging voltage (i.e. charger no-load output voltage) of 8.4v, 12.6V, 16.8v…It is impossible to be a multiple of 12V.

The output voltage of the charger is generally 5V, even 4.9v does not meet the standard. If you use a 4.9v charger to directly charge the pool, it is definitely not allowed. However, there will be a control circuit inside the mobile phone or the seat charger. Unless the circuit goes wrong, it will limit the charging voltage to be within the allowable range, so there is no need to worry about this.

3.3. Grepow 3.7V lithium battery List

Manufacturer	Voltage	Capacity	Shaped	Type	Model
Grepow	3.7V	220mAh	Rectangle	Lipo Battery	GRP4812050
Grepow	3.7V	120mAh	Irregular Hexagon	Lipo Battery	GRP4022020
Grepow	3.7V	22mAh	ultra-thin	Lipo Battery	GRP0422055
Grepow	3.7V	90mAh	Curve	Lipo Battery	GRP3113031
Grepow	3.7V	225mAh	Curve	Lipo Battery	GRP4017040
Grepow	3.7V	200mAh	Rectangle	Lipo Battery	GRP5811047
Grepow	3.7V	220mAh	Rectangle	Lipo Battery	GRP6011047
Grepow	3.7V	66mAh	Button-Cell	Lipo Battery	GRP1254
Grepow	3.7V	250mAh	Rectangle	Lipo Battery	GRP5212050
Grepow	3.7V	40mAh	Curve	Lipo Battery	GRP2508030
Grepow	3.7V	450mAh	Rectangle	Lipo Battery	GRP6824037
Grepow	3.7V	85mAh	Curve	Lipo Battery	GRP3512029
Grepow	3.7V	22mAh	Rectangle	Lipo Battery	GRP2010021
Grepow	3.7V	37mAh	Rectangle	Lipo Battery	GRP3013020
Grepow	3.7V	100mAh	Round	Lipo Battery	GRP5516015
Grepow	3.7V	125mAh	Round	Lipo Battery	GRP5521020
Grepow	3.7V	135mAh	Round	Lipo Battery	GRP2530027
Grepow	3.7V	1500mAh	Round	Lipo Battery	GRP7550040
Grepow	3.7V	170mAh	Round	Lipo Battery	GRP3030027
Grepow	3.7V	210mAh	Round	Lipo Battery	GRP2537036
Grepow	3.7V	225mAh	Round	Lipo Battery	GRP3630027
Grepow	3.7V	835mAh	Irregular Round	Lipo Battery	GRP7042030
Grepow	3.7V	300mAh	Round	Lipo Battery	GRP5030027

If you would like to know more about batteries please contact us at info@grepow.com

Website: www.grepow.com