In the security laboratory, there is a special display board with a "security tree" painted on it-from the root of the tree to the Crown, five layers of defense lines are progressive: cell intrinsic security, module isolation security, PACK structure Security, BMS management security, and system application security. This tree is a systematic understanding of the safety of lithium batteries by new energy sources and a five-fold life defense line that every battery pack must cross.

First: cell intrinsic security. Juneng New Energy insists on selecting cell of the first-line brands, and performs full inspection and distribution for each batch. The capacity deviation is controlled within 1%. In terms of chemical system selection, lithium iron phosphate is preferred for extremely sensitive security scenarios (home energy storage, manned vehicles), and ternary lithium for scenarios with higher energy density requirements (electric two-wheel, portable devices). The cell diaphragm is reinforced with ceramic coating, which does not shrink even at the high temperature of 130℃, blocking the internal short circuit path.

Second: module isolation security. When the cell is grouped, the new energy source is placed between cell aerogel heat proof mat, and the thermal conductivity is as low as 0.02W/(m · K). In a thermal runaway spread test, a single cell was heated to thermal runaway, and heat proof mat locked the heat in a local area. The temperature of the adjacent cell did not exceed 80℃, and there was no sign of spread within 30 minutes. This "precise heat insulation" design has won precious time for personnel evacuation and fire fighting disposal.

The third weight: PACK structural safety. The box adopts high-strength aluminum alloy profiles, and the intrusion amount under side impact condition is reduced by 30% compared with the traditional scheme; Basalt fiber coating is added at the bottom Fender, and the stone strike resistance is improved by 2 times; Directional design of pressure relief channel, guide the high temperature gas to the safe area to avoid spraying to the passenger cabin or equipment cabin.

the fourth priority: BMS management security. Self-developed BMS of energy gathering new energy is equipped with six protection mechanisms: overcharge protection (millisecond cut-off), overdischarge protection (preventing irreversible damage), overcurrent protection (step-by-step current limiting), short Circuit Protection (instantaneous fuse), temperature protection (wide temperature range control), active equalization (prevent inconsistency accumulation). More importantly, the BMS is deeply linked with the whole vehicle or equipment system. After the collision signal is triggered, the high pressure is cut off in milliseconds, and the thermal runaway warning signal automatically starts the fire protection system.

Fifth: System application security. Energy gathering new energy provides customers with safe use guidelines, including charging environment requirements, storage temperature suggestions, regular inspection lists, and emergency handling procedures. A European customer suffered from low temperature damage due to failure to store batteries according to the guidelines. Energy accumulation new energy not only assisted in replacement, but also helped customers establish a complete battery management system to fundamentally eliminate similar risks.

The five defense lines are progressive, but the new energy source knows well that there is no end to safety. The delivery of each piece of battery pack is not the end of safety work, but the beginning of safety responsibility. When the industry regards safety as "cost", the new energy source regards it as "investment"-investment in life, investment in trust and investment in the future.