The mass production of 4680 cells has pushed the energy density of outdoor power supplies to a new high!

4680 battery

The outdoor power supply has both AC power output capability and USB PD fast charging, which can satisfy the charging of mobile phones and laptops, and the high-power AC output capability can supply power for appliances using a 220V AC power supply. As an All in one product of mobile power supply, outdoor power supply has greatly unlocked the scope of use.

The outdoor power supply has a built-in high-energy-density lithium-ion battery for energy storage, long battery cycle life, lightweight and easy portability, and its overall performance is more stable and reliable. Demand for emergency power supply and power for outdoor work.

The outdoor power supply uses a lithium battery for energy storage

Lithium batteries have the outstanding advantages of high voltage platforms, high energy density, low self-discharge, and long life. Once they are born, they are widely used in portable devices such as mobile phones and notebook computers. Multi-string lithium battery packs can output greater power, and are used for mobile power and energy storage. They are lightweight and compact and can meet the application needs of different occasions.

By connecting multiple lithium batteries in series to increase the battery voltage, it can meet the needs of high-power inverter output of outdoor power supplies, thereby meeting the electricity demand of various electrical equipment. At this stage, the outdoor power supply of about 300-600W usually uses a 4-series or 6-series battery pack to meet the DC power supply of high-power inverters.

A battery pack in an outdoor power supply that supports 600W output, using 10 parallel 6 series connections, a total of 60 18650 batteries are used. Among them, the battery adopts a bracket, which is then connected as a whole through point welding one by one, and then fixed inside the outer casing of the outdoor power supply, which takes a lot of labor.

The outdoor power supply using 18650 or 21700 battery packs has a large number of batteries, and the production and processing process is more complicated.

What is the specification of the 4680 battery?

The 4680 battery has a diameter of 46mm and a length of 80mm. In our daily use of power banks and flashlights, the commonly used battery sizes are 18650 batteries with a diameter of 18mm and a length of 65mm and 21700 batteries with a diameter of 21mm and a length of 70mm.

Among them, the 18650 battery is used in the Tesla Model S, and the 21700 battery is used in the Tesla Model 3. These two specifications of batteries have been widely used in mobile power supplies, flashlights, and outdoor power supplies.

The picture shows a built-in 18650 battery pack of a 300W outdoor power supply. The battery adopts a structure of 4 strings and 9 parallels, with a total of 36 batteries, forming a battery pack with a capacity of 14.8V and 21.6Ah. The built-in 18650 battery specification is 3.7V 2400mAh.

The picture shows the BAK 21700 battery used in the flash pole mobile charging station. The single battery capacity is 5000mAh, and the total capacity of 4 batteries is 20000mAh.

Although the single-cell capacity of the 4680 battery can match the above battery packs, the low voltage of a single-cell battery cannot meet the needs of high-power charging and discharging of mobile power supplies. At the same time, the diameter of 46mm also bid farewell to mobile power supplies and other handheld devices. Applications. However, 4680 batteries, except for new energy vehicles, are very suitable for application in outdoor power supply.

4680 Battery Advantages

One of the most obvious advantages of the 4680 battery is that the all-tab technology makes both the positive and negative current collectors in the battery act as tabs, which greatly reduces the internal resistance of the battery. The all-tab technology can eliminate the problem that the internal current density gap is large when the battery is charged and discharged at a high current, and greatly reduce the loss of the positive and negative current collectors of the battery in the traditional tab design. This method can reduce the pressure difference caused by the internal resistance of the current collector when the current flows through the current collector, and make the current distribution uniform. Eliminate the voltage difference between the single-point tab connection and the far end of the tab in traditional batteries, thereby greatly improving the battery’s charge and discharge capacity.

This is also the reason why the power of the electrodeless battery in Tesla’s publicity is 6 times that of the traditional battery with electrode ears. At the same time, the electrodeless ear technology also reduces the internal resistance of the battery and reduces the loss of the battery during charging and discharging, which is equivalent to improving the battery’s performance. Compared with the traditional battery with tabs, the discharge efficiency has increased by 16%, and it also has a stronger fast charging capability.

According to a newly launched 4680 battery, the battery capacity is 26Ah, which is more than 5 times the capacity of the current 21700 battery and 8 times the capacity of the 18650 battery. Applied in outdoor power supply, a 4680 battery with the same capacity is equivalent to 5 Parallel connections of 21700 batteries is equivalent to a parallel connection of 8 18650 batteries. That is to say, the energy stored by a 4680 battery is equivalent to a Zimi 20 mobile power supply with 5 built-in 21700 batteries.

The capacity of a 4680 battery is converted into Wh of about 94Wh. Using 4 or 6 4680 batteries in series can replace the assembly of dozens of battery packs in traditional 18650 or 21700 battery packs, which can meet the storage capacity of hundreds of Wh in outdoor power supplies. It greatly simplifies the manufacturing process of multi-string lithium battery packs in outdoor power supplies.

Using 4680 batteries in the outdoor power supply, because the number of battery cells is reduced, the battery protection circuit and battery pack design are simplified, and the cost advantage and integration advantage of 4680 batteries can be used to optimize the cost of outdoor power supply products.

At the same time, it can be seen from the data that the 4680 battery has excellent fast charging capability. It starts from 10% and can be charged to 80% in only 20 minutes, which greatly shortens the charging time.

Compared with the traditional 18650 battery and 21700, 4680 battery, the internal structure has been optimized, and the electrodeless ear design improves the charging and discharging capacity of the battery, and the corresponding effective area of ​​the electrode plate is also larger, which improves the capacity of the battery. Compared with the traditional 18650 battery and 21700 battery, the internal space utilization rate of the battery is higher, and the energy density is also improved.

The 4680 battery has a fast-charging capacity of more than 2C. Compared with the traditional small-sized cylindrical battery, it can be fully charged within 1 hour, and the discharge capacity has also been greatly enhanced. It can use a smaller number of 4680 batteries to meet the needs of high power such as several kilowatts. the inverter output. Instead of needing sufficient capacity like traditional batteries, it can maintain a high-power inverter output. Small size + high power output further enhances the competitiveness of outdoor power supply products.

4680 battery is a standard product. After mass supply, product quality and supply are guaranteed. When used in outdoor power supplies, outdoor power supply manufacturers do not need to compete with consumer products for battery capacity. The price and delivery time are compared with traditional small-sized cylindrical batteries. is more competitive. The 4680 battery can also be matched with the casing to simplify the design of the battery bracket, reduce the internal battery fixing parts of the outdoor power supply, simplify the casing design and free up the internal space.

Due to its size, the 4680 battery is not suitable for mobile power and handheld device applications, but outdoor power is an ideal application for the 4680. A 4680 battery is 5 times the capacity of a 21700 battery, and one battery can replace 5 21700 batteries in parallel or 8 18650 batteries in parallel, simplifying the BMS design of the battery pack and improving the overall reliability.

At the same time, the 4680 battery is an optimized battery form. The unique electrodeless ear design eliminates the pressure difference caused by the internal resistance of the battery current collector, the internal resistance of the battery is also lower, and the charge and discharge capacity is greatly enhanced. Applied to the outdoor power supply, it can greatly improve the AC output capability, and greatly shorten the charging time, making the outdoor power supply easier to use.

Compared with the traditional small-sized cylindrical battery, the 4680 has obvious performance advantages, and the large-capacity single-cell design has effectively reduced the cost. It is an ideal choice for future large-capacity lithium battery energy storage applications.

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