Car companies have developed their own self-made battery cells, and this time it is the turn of Zeekr.
At the press conference on December 14, the senior management of ZEEKR announced that the first 800V lithium iron phosphate ultra-fast charging "golden brick battery" was produced at the Quzhou Jidian Sandian Manufacturing Base and will be equipped on the ZEEKR 007 for the first time.
This is another release of more detailed information about the gold brick battery after the preheating.
The official publicity points are mainly as follows:
1. The world's first mass-produced 800V lithium iron phosphate fast-charging battery, supporting up to 45C fast charging;
2. The volume utilization rate is 837%；
3. Safer design, three limit test experiments.
4. The cost of a single kWh is 14 lower than that of ternary lithium batteries8%；
5. Comprehensive layout of multi-scenario charging system.
800V LFP fast charging battery.
According to the production line information before the press conference, the gold brick battery contains two large modules, the cells are placed along the thickness direction, the patent information shows that the cells are bonded and fixed with hot melt adhesive (the specific material is to be confirmed by the finished product), the liquid cold plate is integrated with the lower box, the battery cells are bonded with the lower box and the upper cover, there is a beam design in the middle of the box, and the BDU is integrated in front of the cross beam. The whole package has 196 cells, two module designs, each module contains 98 cells.
According to the calculation of 196 cells, all in series mode, reaching 800V scheme, the single voltage is close to 41v。At present, the battery cells installed in new energy passenger cars on the market are up to 385V, and uses a ternary lithium battery. Therefore, the solution used to achieve 800V for ZEEKR gold brick battery needs to be further communicated and confirmed.
In terms of fast charging, it supports 45C charge rate, 3S discharge rate up to 16C.
At the press conference, the gold brick battery equipped with ZEEKR 007 was compared with the fast charging capacity of other models on the market.
How to achieve this ultra-fast charging ability?ZEEKR executives said at the press conference that the gold brick battery is designed with a laminated multi-tab structure, which has more efficient temperature control and more uniform heat distribution. In addition, the double riveting pole conductive design is adopted, which increases the overcurrent capacity by 100% compared with the monopole.
In addition to structural innovation, improving the efficiency of lithium-ion release, transmission, and reception is also one of the main ways to help BRICS batteries achieve stable and efficient charging performance with high voltage and high current.
Specifically, the cathode adopts nano-scale lithium iron phosphate particles, with a composite conductive agent, enhances the reactivity, accelerates the release efficiency of lithium ions from the positive electrode, uses ultra-fast dissociation electrolyte between the positive and negative electrodes to increase the reaction speed of lithium ions, and the three-layer composite porous membrane ensures its stability, and the negative electrode introduces a low-enthalpy graphite anode material, multi-gradient electrode sheet design, and a low-impedance SEI film on the surface to build an efficient transmission channel and massive storage space for lithium ions while shortening the lithium-ion transfer path.
Fast charging is realized from multiple dimensions such as material and structural design.
What is a safer design?
The BRICS battery uses lithium iron phosphate system, which has better thermal stability than ternary lithium batteries.
On this basis, the BRICS battery has been comprehensively upgraded with 8 safety designs.
In order to verify the safety of the BRICS battery, ZEEKR claims to have designed three extreme safety tests for the BRICS battery, adding an extrusion procedure to the acupuncture test, increasing the external fire time from 130s to 240s on the national standard time, and superimposing serial tests under 6 extreme working conditions: immersion, fire, freezing, dragging, rolling and high falling.
In addition, Golden Brick Battery has developed a new 4000V exclusive gold high-voltage resistant insulating film.
The volume utilization rate is 837%？
One of the major disadvantages of lithium iron phosphate is its low energy density, and in order to solve this pain point, the volume utilization rate of ZEEKR gold brick battery has been increased to 837%。ZEEKR claims that the gold brick battery has 26% more power than the traditional lithium iron phosphate battery, which can be adapted to large SUV or MPV models.
The volume utilization rate of other homes is the online data, and the volume utilization rate data of the BRICS battery is the volume utilization rate of the battery cell warehouse, and whether the comparison standard is unified needs to be further confirmed.
How to optimize the volume utilization rate of gold brick batteries?
The first is the longitudinal space, which uses the "compact sandwich structure" of the cell, top cover and bottom plate to reduce the longitudinal height to 76% increase in volume utilization;Secondly, aviation-grade ultra-thin thermal barrier materials are used between the cells, and the volume utilization rate is increased by 6%.In addition, the liquid cold plate and tray are integrated into an integrated liquid cooling tray, and the volume utilization rate is increased by 8%.
At the same time, based on the optimization of the design, the total length of the sampling harness of the BRICS battery pack is reduced by 157m, the number of components is reduced by 35%, the energy density of the battery quality is increased by 10%, and the overall volume utilization rate reaches 837%。
These optimized designs are also the mainstream designs on the market, but they can do 837%, the gold brick battery is indeed the first in the world, but the calculation method of this indicator needs to be further confirmed.
The cost of a single kWh is 14 lower than that of ternary lithium batteries8%
How to reduce costs, ZEEKR brick battery gives several ideas, which are combined to increase production efficiency by 40% with platform design, integrated equipment and intelligent environmental protection capabilities.
The competition of efficiency brings about a decrease in cost, and the cost per kWh of ZEEKR gold brick battery can be reduced by 14 compared with ternary lithium batteries8%。The gold brick battery uses lithium iron phosphate system, which is not unified in standard and not comparable compared with ternary lithium battery. And if you follow both 0$6 wh and 08 yuan wh ** comparison, the price difference range is 25%, 148% doesn't seem convincing.
Comprehensive layout of multi-scenario charging.
ZEEKR said at the press conference that as of November 30, 2023, 401 pole charging stations covering 100 cities have been built, 2,261 ultra-fast charging parking spaces, and the peak power of a single gun is greater than 360kW.
According to the plan, ZEEKR will achieve a total of 100 pole charging stations in 2024 and 10,000 in 2026.
In addition, ZEEKR launched the 1515 convenient electricity plan, which will achieve 15 minutes to find a good pile and charge it in 15 minutes in the next three years, covering more than 90% of ZEEKR car owners and improving the convenience of urban commuting.
For long-distance travel, ZEEKR has cooperated with 35 domestic public operators to access more than 610,000 charging piles, and the coverage rate of highway charging piles will increase to more than 95% in 2024.
In terms of home charging, ZEEKR launched a 20kw DC charging pile, which was launched at the press conference.