Recently, blade batteries seem to be on fire again, not because of BYD, but because blade batteries seem to be the best choice for energy storage batteries except being used in EVs. In addition to BYD's 3.2V 138Ah blade battery, Svolt and EVE have also launched new blade batteries, please continue reading this blog, we will inform you of the specific capacity of Svolt and EVE blade batter later. Many customers are looking for blade battery for energy storage application.

Blade battery is a type of lithium iron phosphate (LFP) battery for electric vehicles designed and manufactured by FinDreams Battery, a subsidiary of Chinese manufacturing company BYD

About BYD Blade Battery

As we all know, BYD developed blade battery in 2020 and installed it on its flagship sedan Han EV. Compared with conventional lithium iron phosphate prismatic batteries, blade battery can raise the space utilization rate of the battery pack by over 50%.

In the nail penetration tests, a common way to test the performance and viability of cell batteries, BYD’s blade battery emitted neither smoke nor caught fire after being penetrated, and the surface temperature ranged between 30 and 60  degrees Celsius.

However, under the same conditions, a ternary lithium battery’s temperature exceeded 500 degrees Celsius and burned.

Compared with NCM batteries and traditional LFP batteries, blade batteries have significant advantages such as high safety, long battery life, long battery life, and super high power.

• Unique design: A revolutionary new blade battery provides a new level of safety for today's electric vehicle industry. Designed to maximize the available space within the battery pack.
• Top performance: Electric vehicles equipped with blade batteries have a cruising range of more than 600 kilometers.
• Ultra-high security: In the severe safety test and nail penetration test, the blade battery does not emit smoke or catch fire after being pierced, and the surface temperature only reaches 30~60℃. It is the only power battery in the world that can safely pass the test.
• Good heat dissipation conditions: Can be arranged in arrays to insert battery packs like blades. Since enough space is reserved between the cells, the heat dissipation conditions of the cells will perform better than traditional battery packs, so its a very good choice for Energy storage battery, too.

Regarding Svolt Blade Battery

Targeted innovation of five major processes：

• Coating process：The coating speed reaches the level of 80m/min, the coating surface density is controlled within ±1.5%, and the dislocation of the front and back of the coating is less than or equal to 0.5mm. The coating machine in this process can coat 1.4 meters in two rows. This is one of the widest coaters in the industry.
• Rolling process：the CPK(Complex Process Capability index) of the "short knife" of Honeycomb Energy is greater than 1.33 (equivalent to the theoretical pass rate of products in this process section = 99.993%).
• Die-cutting process: Laser die-cutting process is adopted. Laser die-cutting has higher precision, less burrs, no need for molds, and faster speed, from 30 meters per minute to 40-50 meters.
• Lamination process: The lamination speed of 0.125 seconds/piece is achieved. The lamination speed of 0.125 seconds/piece can already be called the board winding process. The general winding speed is 0.2 seconds/sheet. While folding fast, you have to fold accurately. The alignment accuracy of the "short knife" lamination process is now ±0.3mm, the best in the industry.
• Assembly process：Using the industry's first maglev logistics line, it can achieve a cruising range of 550km for A-class models, and can achieve 1.6C fast charging under high energy density, satisfying more than 80% charging in 30 minutes.

As for EVE Blade battery, we just got the news that they have produced 3.2V 154Ah blade battery, specification as below:

Nominal Voltage:3.2V

Nominal capacity:154Ah

Working voltage:2.5V~3.65V

AC impedance resistance(1khz,40%SOC ):≤0.5mΩ

Dimension: L347*W110*T34mm

Weight: 2755±30g

Maximum Continuous Charge Current: 154A(1C)

Maximum Peak Charge Current: 200A(1.3C)

Maximum Continuous Discharge Current: 200A(1.3C)

Maximum Peak Discharge Current: 462A(3C)

We've seen blade batteries seem to be gaining popularity, and some major brands are starting to research and already produce them. Why?

Lets take a look at Blade cells VS regular type prismatic cells

The size of the Blade cell is larger and has a higher capacity when compared to regular block type prismatic cells.

Using a higher number of smaller capacity regular type prismatic cells create a mechanical disconnect in a battery pack and leads to less efficient utilization of the space. Regular type prismatic cells have to be packed as a module first and then the modules are assembled into a final battery pack.

On the other hand, blade cells allow for direct cell to final battery pack assembly, eliminating the need to assemble into modules and increasing the overall volumetric energy density of the final battery pack. The singular cells are arranged together in an array and then inserted into a battery pack. Due to its optimized battery pack structure, the space utilization is increased by over 50% compared to conventional L FP block batteries.

The improvement in the cell architecture and its direct ability to be assembled as a battery pack, has allowed for blade battery to compete with NMC packs in terms of volumetric energy density and offer a similar kind of range. Additionally, NMC battery packs need liquid cooling since they have a lower operating temperature, which takes up more space again and drives up the price of the battery pack. These reasons have made Tesla also consider blade batteries, starting with EVs for the Chinese market, while an interesting point is that Tesla confirm they will use BYD's blade batteries.

So, if you have any question or interest in blade battery, please do not hesitate to contact support@osnpower.com for more market information and details