In the large-scale manufacturing of modern lithium-ion batteries, the electrolyte injection process directly determines the final electrochemical performance of the battery, product consistency, and the crucial safety bottom line. This not only puts forward extremely high requirements for precise measurement control of liquid injection equipment, but also poses severe challenges to the long-term stability of its core components. In actual high-load production, the lithium hexafluorophosphate and various highly polar organic solvents contained in the lithium battery electrolyte are extremely corrosive. Under long-term high-frequency, high-precision reciprocating operation of traditional metal fluid transport components, it is easy to create tiny gaps due to electrochemical corrosion and mechanical wear, which in turn causes the headache of electrolyte dripping. This not only leads to unnecessary loss of expensive raw materials and frequent equipment shutdowns for maintenance, but may also pollute the workshop environment due to electrolyte volatilization, causing serious safety hazards, and ultimately dragging down the yield rate of the overall production line.

To fundamentally bridge this technological gap, traditional metal surface treatment or coating processes have become insufficient. The introduction of zirconia structure ceramic valve core has brought a revolution in materials science to the core fluid control components of the liquid injection pump. As a representative of advanced structural ceramics, zirconia is known as "ceramic steel" in the industry. It not only has fracture toughness and flexural strength that far exceeds that of conventional ceramics with the support of phase change toughening mechanism, but also has unparalleled chemical inertness. When in long-term direct contact with strong acids, strong alkali and highly corrosive battery electrolytes, zirconia ceramics will not dissolve, oxidize or react chemically, completely cutting off the risk of corrosion-induced structural failure from both physical and chemical sources.

1. Zirconia ceramic valve Core performance and material analysis

In the field of precision fluid control, the valve core is a core part that can withstand high-frequency shear, friction and chemical erosion, and its material selection is crucial. Why did the industry finally focus on and highly trust zirconia ceramics under the fierce working conditions of lithium-ion injection pumps? We can find the answer from its hard-core material performance.

• Unique microscopic material and phase change toughening mechanism: Zirconia ceramics have a unique crystal phase structure (such as partially stabilized zirconia PSZ). When the material is subjected to external force and microcracks expand, the stress concentration will induce a local crystal phase transformation (the tetragonal phase transforms into a monoclinic phase), and the accompanying volume expansion will squeeze and close the cracks, thus demonstrating extremely high fracture toughness and impact resistance. This completely changes people's stereotype of traditional ceramics as "brittle and easy to collapse."

Zhufa precision ceramic material performance table

• Extremely resistant to acid, alkali and chemical attack: Facing the highly corrosive lithium salt in the electrolyte, zirconium oxide has almost inert chemical stability and will not cause ion precipitation to pollute the electrolyte like metals.
• Ultra-high wear resistance and self-lubricating properties: Mohs hardness is second only to diamond and silicon carbide, and its extremely low friction coefficient enables it to maintain a nanometer-level sealing surface smoothness during high-frequency reciprocating motions dozens of times per minute.
• Micron level thermal stability: The coefficient of linear expansion matches that of some metals and is not prone to thermal deformation when friction and heat are generated during high-speed operation, ensuring the weight accuracy of long-term liquid injection.

2. Valve core material multi-dimensional comparison of competing products

In order to more clearly demonstrate the overwhelming advantages of zirconia ceramics in the application of lithium-ion liquid injection pumps, the following table makes a horizontal and multi-dimensional comparison between traditional metal valve cores, alumina ceramic valve cores and Chihfa precision zirconia ceramic valve cores:

3. Congratulations Precision empowered by material technology

In response to the core pain point of electrolyte dripping, the zirconia ceramic valve core has achieved true "long-term zero leakage" by virtue of its extreme material hardness and ultra-high surface processing accuracy. In the high-frequency and high-speed injection cycle peeling friction, the metal valve core often suffers from scratches and scratches due to metal fatigue and abrasive wear at the micro level, destroying the original sealing interface. The surface roughness and roundness of extremely high-density zirconia ceramic parts, combined with modern precision centerless grinding and nano-level grinding and polishing processes, can reach extremely high process limits. This means that an extremely tight mirror fit can be formed between the ceramic valve core and the ceramic valve sleeve. There is no need to rely on rubber seals that are prone to aging. Only the physical self-lubricating properties of the material itself and the extremely narrow gap can ensure the precise measurement and absolute sealing of each micro-injection. Micron-level sealing surface accuracy can still be maintained even after tens of millions of cycles.

For modern lithium battery equipment manufacturers and battery manufacturers that pursue extreme cost reduction, efficiency improvement and intelligent manufacturing, the use of high-quality zirconia ceramic valve cores is not just a simple replacement of consumables, but a key strategy to improve the reliability of core equipment and build a green and safe production barrier. It greatly extends the trouble-free continuous operation time (MTBF) of the liquid injection pump, freeing enterprises from the inefficient operation and maintenance of frequent procurement of seals and shutdown to replace valve cores, thereby maximizing production capacity potential.

As a professional intelligent manufacturer deeply involved in the field of advanced ceramic materials, Zhejiang 祝 Fa Precision Ceramics has always been committed to providing high-precision structural ceramic solutions for the new energy industry. Relying on rigorous powder molding technology and cutting-edge precision machining capabilities, Zhufa Ceramics' tailor-made zirconia injection pump valve core not only reaches the international advanced level in terms of dimensional consistency and micro-finishness, but has also undergone rigorous machine verification by many leading lithium battery equipment manufacturers. Empowering lithium battery equipment with material technology, it completely overcomes the stubborn dripping problem and makes every injection accurate.