Technical features of BYD blade batteries ：
The BYD blade battery adopts the CTP (Cell To Pack) design concept. The battery cells are directly installed in the battery pack shell as arrays, eliminating the need to assemble the battery cells into modules . This design can maintain the strength of the battery pack, without the cross beam, longitudinal beam and various bolts and other accessories, so as to improve the space utilization inside the battery pack housing, to achieve the total capacity of the battery pack and energy density. The shape of the blade battery is a flat rectangle, which not only improves the heat dissipation effect, but also demonstrates its high safety and strength through needle tests and heavy truck rolling tests.
Production technology
BYD Blade battery adopts lamination process. Compared with traditional winding process, lamination process has better performance in internal resistance, internal temperature consistency and internal stress. The blade battery cell length is 960mm, the thickness is 13.5mm, and the height is 90mm. In the production process, BYD carried out a dust-free design on the workshop, and the key processes reached the hundred-level standard to ensure the cleanliness of the production environment. The coating process supports a maximum width of 130cm, and the rolling process ensures a consistent electrode thickness and a lamination speed of 0.3 seconds per piece, the highest in the industry. In addition, BYD has independently developed pressurized liquid injection technology for the space capsule to ensure full injection of electrolyte.
Energy density and driving range
The energy density of the BYD blade battery is 50% higher than that of the traditional iron lithium battery, making the single-motor version and dual-motor version of the driving range of 605 km and 600 km, respectively. The blade battery design increases space utilization from 40% to 60%, and is expected to increase vehicle battery life by 20% to 50%. Byd plans to increase the energy density of the single unit to 180wh/kg and the system energy density to 160wh/kg in the next two years, which will further enhance the performance and competitiveness of electric vehicles.
Safety and longevity
The BYD blade battery passed the needle test and the heavy truck rolling test, demonstrating its high safety and strength. Its design allows for a large heat dissipation area and a long internal loop, reducing the risk of temperature rise. The lithium iron phosphate anode material has a low risk of thermal runaway, and the possibility of internal pressure increase and temperature increase is small, thus avoiding explosion and combustion. The blade battery is designed to last up to 8 years and more than 1.2 million kilometers, meeting the needs of the full life cycle of the vehicle.
advantage of LiFePO4 BYD Blade Cell (3.2V/82.3Ah CBV01）：
1. Increased battery energy density：
The blade battery cancels the module design and reduces the design of many structural parts.
At the same time, the upper and lower boxes are closely connected to the battery core, which significantly improves the volumetric energy density. This is also BYD’s widely publicized 50% increase in volumetric energy density.
2. Low cost：
The blade battery cancels the module design and optimizes the battery structure design. The number of secondary battery components has been reduced by 40%, and the low-cost LFP system has been applied, effectively reducing costs.
3. Strong structure：
The blade battery PACK is designed on the upper and lower sides of the battery cell, and two high-strength strength plates are bonded using structural adhesive. This creates a structure similar to a honeycomb aluminum plate, allowing each cell to act as a structural beam. Traditional battery packs generally only have 4-5 beams, while blade batteries allow each cell to act as a structural member, so its strength can be imagined. When there is a collision at the bottom of the battery, the battery core can directly withstand a certain range of force.
4. Excellent thermal management：
The liquid cooling plate of the blade battery is arranged above the battery core. At the same time, a thermal conductive layer is designed between the battery cores. The heat exchange area of this solution is much larger than that of traditional prismatic battery cells. It can effectively transfer the heat of the battery core to the water-cooling plate.
In addition, the blade battery has good heat dissipation performance, so the heat pipe of the blade battery is excellently designed and can control the maximum temperature difference within the battery within 1 ℃. The current industry standard is 5 ℃
5. Platform ization：
Blade batteries come in different specifications. Its length can be changed between 347~1012mm. In addition, it is a standard flat-type battery pack. Blade Battery can change the size of the battery pack in the X and Y directions according to the vehicle space, and develop batteries of different specifications.
This platform-based battery effectively reduces development costs and time. Its patent shows that there are at least 8 types of blade battery solutions. And corresponding to different sizes of batteries and different arrangements, the double-layer battery solution is also considered. For the integration of the cabinet, there are traditional separation solutions of the chassis and the cabinet, and there are also integrated chassis solutions in which the two are integrated into one.
