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When 800V High Voltage Meets 4C Fast Charging: How Jueneng New Energy is Reshaping the Thermal Management Logic of Battery Packs
time：2026-07-28
In the new energy vehicle market in 2026, 800v high-voltage platform and 4C ultra-fast charge have gone from high-end selection to mainstream standard. Behind the vision of charging for 5 minutes and endurance of 200 kilometers is the ultimate test faced by the power battery PACK thermal management system. A technological revolution about "how to tame heat" is quietly taking place in the laboratory and production line of energy gathering and new energy.
I. 4C fast charge "hot trap": why is the traditional solution no longer enough?
4C fast charging means that battery pack can complete 0-80% power replenishment within 15 minutes, and the peak charging current can reach hundreds of ampey. According to Joule's laws, the calorific value is proportional to the square of the current-the heat generation power under 4C working condition is 16 times that of 1C slow charge.
"The traditional air cooling scheme has basically failed in 2C or above. Even the conventional liquid cooling will face the risk of local hot spots and out-of-control temperature difference when 4C continues to charge quickly. "The chief thermal management engineer of Energy New Energy pointed out. The measured data shows that when the unoptimized PACK is fast charged at 4C, the maximum surface temperature of cell can soar above 55℃, and the temperature difference of the whole package exceeds 8℃, which not only accelerates the aging of cell, A warning line that triggers thermal runaway.
Although the 800v high-voltage platform reduces current and line loss, the internal polarization heat generation and interfacial impedance heat generation cell are still significant.The superposition of high pressure and fast charge poses three challenges to thermal management: "Fast, uniform and stable.
II. The way to break the new energy source: Three-dimensional thermal management architecture
facing the challenge, energy-gathering New Energy has proposed a three-dimensional thermal management scheme of "electricity the rate of pillow inner-module level-system level.
Electric the rate of pillow inner: accurate matching of high thermal conductivity interface materials. The new energy source and material suppliers jointly developed a new generation of thermal silicone pad, and the thermal conductivity increased to 8W/(m · K), which is 60% higher than that of traditional products. More importantly, the gradient thermal conductivity design-cell the center area of the large surface uses high thermal conductivity materials to quickly export heat, while the Edge area buffers temperature fluctuations through phase change materials to realize "hot spot dispersion, dynamic balance of cold zone insulation.
Module Level: Bionic Runner fluid cold plate. Based on the branch structure of human blood vessels, the asymmetric tree flow channel is designed with new energy sources. The coolant diverts from main pipe to dozens of micro branches, covering each cell "hot hinterland". CFD simulation and experimental verification show that the design compresses the temperature difference between the inlet and outlet of liquid cold plate from the traditional 6℃ to less than 2℃, and the maximum temperature difference of the whole package is controlled below 3℃.
system level: intelligent temperature control algorithm is linked with vehicle thermal management. The self-developed BMS, which gathers new energy sources, no longer passively responds to the temperature, but predicts the heat load based on the cell heat generation model and adjusts coolant rate and temperature in advance. After deep coupling with the heat pump air conditioning system of the whole vehicle, the waste heat of electric drive can be used to preheat the battery in winter, and the heat of the battery is directed to the cabin for heating in summer, thus improving the energy efficiency of the system by more than 15%.
III. Extreme working condition verification: from laboratory to real scene
technological innovation needs to undergo extreme working conditions.
In the test center of energy accumulation new energy, 4C fast charge cycle test is the most stringent "Daily"-charge battery pack from 10% to 80%, then discharge to 10% at 1C, and cycle thousands of times. Test data show that PACK with a new generation of thermal management solution, the maximum temperature of cell is stable within 45℃ during 4C fast charge, and the capacity retention rate is still above 92% after 1,000 cycles.
The more severe test comes from the environmental adaptability test. In the extremely cold environment of-30 ℃, the battery pack of the new energy source increases the temperature of cell from-20 ℃ to 5 ℃ within 5 minutes through pulse self-heating technology, which meets the fast charging start conditions. In the high temperature environment of 45℃, the liquid cooling system runs at full power to ensure that the temperature of cell does not turn red.
the success of the laboratory is not equal to the reliability of the production line. Energy gathering new energy disassembles hundreds of process control points into the thermal management scheme and embeds the MES system to monitor the whole process.
The welding flatness of liquid cold plate shall be controlled at ± 0.05mm to ensure uniform fit gap with cell; The coating of thermal conductive pad adopts visual guiding robot, and the thickness deviation shall not exceed ± 0.05mm; after the coolant is poured, it needs to be exhausted through three cycles to prevent local heat transfer failure caused by air resistance. The deviation of each process will be captured and warned by the system in real time.
"What we pursue is not the extreme of single-point parameters, but the robustness of the system. "The director of new energy manufacturing stressed," even under the worst combination of working conditions, the thermal management system should keep sufficient safety margin. "
the wave of 800V high voltage and 4C fast charge is reshaping power battery PACK the technical paradigm. Energy gathering new energy responds to the proposition of the times with a three-dimensional thermal management architecture, and uses the integration of material innovation, structural optimization and intelligent algorithms to build a great wall of heat dissipation for the next generation of battery pack. In this competition of "Taming heat", there is no final result, only continuous evolution. For consumers, shorter charging waiting, longer battery life and more comfortable travel experience are the best footnotes of this technological revolution.
Contact us
Dongguan Juneng New Energy Technology Co., Ltd.
137 5142 6524（Miss Gao）
susiegao@power-ing.com
Xinghuiyuan High tech Industrial Park, Dalang Town, Dongguan City, Guangdong Province
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