BYD'S NEW BLADE BATTERY SET TO REDEFINE EV SAFETY STANDARDS Cell. BYD are able to make cells to a range of dimensions. The following set of specifications gives an example set of numbers that are consistent for this particular cell: Contact online >>
BYD''S NEW BLADE BATTERY SET TO REDEFINE EV SAFETY STANDARDS Cell. BYD are able to make cells to a range of dimensions. The following set of specifications gives an example set of numbers that are consistent for this particular cell:
Prismatic Cell vs. Blade Cell. Let''s take a look at blade batteries again and compare prismatic batteries and blade batteries that are widely used on the market. The prismatic cell length is 148 mm, the thickness is 79 mm, and the height is 97 mm. The internal structure is rolled and looks like a brick.
The blade battery is most commonly a 96 centimetres (37.8 in) long and 9 centimetres (3.5 in) wide single-cell battery with a special design, which can be placed in an array and inserted into a battery pack like a blade. It is made in various lengths and thicknesses.
BYD CTP (Cell to Pack) technology makes the difference, with the Blade Battery increasing space utilization by 50%. This improves energy density and allows more batteries in a compact space, with a longer driving range. The ''honeycomb-like aluminum'' design of the Blade Battery also provides greater rigidity and safety.
Since BYD announced the blade battery for the first time at the 100-person meeting for electric vehicles in January 2020 and the blade battery launch conference on March 29, there has been more discussion about blade batteries in the industry.
The other is that blade batteries solve many of the shortcomings of lithium iron phosphate and are groundbreaking.
Next, we will talk about the BYD blade battery.
Traditional battery systems first assemble battery cells into battery modules. Then install the battery module into the battery system for hierarchical management.
The battery module supports, fixes, and protects the battery cells in the mechanical structure.
The battery system plays a role in supporting, fixing, and protecting the battery module.
The blade battery is a brand new design concept. While using long batteries, the intermediate module link is omitted and the batteries are directly installed into the battery system. This effectively reduces weight and cost. This is similar to CTP in the CATL era.
At the same time, BYD’s battery structure design draws on the principle of honeycomb aluminum panels. The battery core is fixed between two layers of aluminum plates with structural adhesive, allowing the battery core itself to act as a structural member to increase the strength of the entire system.
Let''s take a look at blade batteries again and compare prismatic batteries and blade batteries that are widely used on the market.
Let''s take a look at the development trends of battery materials for pure electric vehicles in recent years. In the field of electric vehicles, there have always been two technical routes, ternary and lithium iron phosphate batteries.
Ternary batteries are chosen by most car companies due to their high energy density. But it has the disadvantage of high cost.
On the contrary, lithium iron phosphate has a lower cost but low energy density. Moreover, the current energy density of lithium iron phosphate is close to the theoretical limit.
BYD is a manufacturer of lithium iron phosphate batteries. Although BYD has used ternary batteries in most of its pure electric vehicles at this stage, it has never given up on the technical route of lithium iron phosphate. Since energy density cannot be exceeded in terms of materials, BYD engineers work from the perspective of system integration.
We summarize the development rules of battery system integration.
First, let''s take a look at the first-generation battery pack, which is a special-shaped battery pack. To save costs, standard modules are used. But the group efficiency is relatively low.
The second generation battery pack is also a special-shaped battery pack. In order to improve the group efficiency, non-standard modules matching the battery structure were selected, which significantly improved the group efficiency.
The above two battery packs are based on traditional passenger car platforms.
The third generation battery pack is mostly used in pure electric vehicle platforms. There are three different development trends, but they have one thing in common, they are all tablet batteries. However, module-less technology, blade battery technology and 590 standard large module technology are applied respectively. In this way, the group efficiency is significantly improved again.
Among them, the blade battery has the highest improvement. Blade batteries cannot achieve higher energy density in battery materials, but they have made breakthroughs in battery system integration. This solves the shortcomings of short battery life of lithium iron phosphate batteries.
This is the background for the birth of blade batteries.
The disadvantage of low energy density of LFP is inevitable.
By increasing the length of the battery cells and reducing the redundant design of the battery structure and the number of battery cells, BYD engineers can effectively increase the volumetric energy density of the battery cells and the volumetric energy density of the battery pack, thereby improving the vehicle’s cruising range.
From the data published in BYD’s patent, we can see the relationship between different cell lengths and battery pack energy density. It can be clearly found that when the battery cell length increases from 208 to 435mm, the energy density does not change. But when the length increases to 945mm, the energy density increases by 10%.
Another advantage of blade batteries is that they have good heat dissipation performance.
We all know that batteries are particularly sensitive to temperature, which is also the main reason that limits battery fast charging time. Therefore, heat dissipation is a very important indicator for battery cells.
Because the blade battery has a larger heat dissipation surface and a thin thickness, the blade battery core has better heat dissipation performance. From the data released by BYD’s blade battery patent, we can see the temperature simulation results of battery cells with different thicknesses inside the blade battery. We can clearly find that as the thickness of the battery core continues to decrease, the temperature rise of the battery core and battery pack during fast charging is getting smaller and smaller, and the heat dissipation performance is getting better and better.
The above two advantages give us an inspiration. BYD develops battery packs and cells in parallel.
During the development process, multiple design simulations were conducted to continuously optimize the battery cell design so that the battery core can match the battery to the greatest extent. This can maximize the performance of the battery core. This is also the biggest advantage of BYD’s vertical integration.
1. Increased battery energy density
We mentioned this before.
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.
About Byd blade cell sizes
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