The design and function of BYD battery box mainly include the following aspects :
Structure of the battery box : the battery box design of BYD includes a body of the box, which is formed with a cavity for holding the battery. The side wall of the box body is provided with an inlet nozzle and an outlet nozzle, which are respectively formed on the side wall of the box body. The minimum distance between the inlet nozzle and the bottom edge of the side wall is different from the minimum distance between the outlet nozzle and the bottom edge of the side wall, so as to ensure the correct installation of the inlet and outlet water nozzle .
Waterproof and insulation design : The design of the battery box pays attention to waterproof and insulation. The battery box is installed under the bottom plate of the vehicle. The lower shell is made of cast aluminum or steel plate, the upper shell is made of fiberglass steel, and there is a sealant between the upper and lower shells. The battery box is sealed with a rating of IP67 or above, which can effectively prevent dust from entering and soak in water 1 meter deep for 30 minutes .
Electrical connection : In terms of electrical connection, BYD’s battery system uses a busbar to connect the battery module and the distribution box. The bus bar is connected to the output pole of the battery module by bolts. The PDB is integrated with the battery management system, including the main contactor, current sensor, and fuse components .
Thermal Management and safety : The battery management system is responsible for the thermal management and safety of the battery. Efficient electrochemical reaction and thermal management through precision processes ensure battery stability and safety .
Design features and application scenarios of BYD battery box :
Blade battery design : The “blade battery” design adopted by BYD HanEV is flat like a blade, which saves space and improves energy density. It is suitable for high performance electric vehicles .
Compatibility design : The blade battery system is compatible with BEV (pure electric vehicle) and PHEV (plug-in hybrid electric vehicle) designs, ensuring a wide range of applicability .
These design features and technological innovations make BYD’s battery box a significant advantage in the field of electric vehicles, not only improving the vehicle’s endurance and performance, but also ensuring the safety and reliability of the battery.
advantage of LiFePO4 BYD Blade Cell (76.8V/135Ah C102F 1P24S）：
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.
