The shell of lithium-ion cylindrical batteries (such as the common 18650 and 21700 models) is usually made of stainless steel, which is significantly different from the design idea of using aluminum shell or aluminum-plastic film for prismatic batteries or pouch batteries. The reason for choosing stainless steel needs to be considered from many aspects such as the structural characteristics, mechanical requirements, electrochemical environment and manufacturing process of cylindrical batteries. 1. Mechanical strength and compressive requirements The shell of the cylindrical battery is directly used as the physical support of the electrode core (such as the winding structure of the positive electrode-separator-negative electrode). The tensile strength of stainless steel (300~600 MPa, depending on the model) is much higher than that of aluminum (about 40~50 MPa for pure aluminum, 200~400 MPa for aluminum alloy), and can better withstand the expansion stress of the internal core (especially when the expansion rate of the silicon-based anode can reach 300%) and external mechanical impact, and avoid internal short circuit caused by shell deformation. Cylindrical batteries may produce high-pressure gas when overcharging and thermal runaway, and the yield strength of stainless steel is higher, which can effectively resist the rise of internal pressure, delay or prevent the rupture of the shell, and buy time for the timely pressure relief of the safety valve. A-CC-18650 18650 Battery Case with Anti-Explosive Cap and Insulation O-ring,Used for 18650 battery research, producing, especially for Powerful 18650 battery making,100set/package included Cylinder cell case, Cap and up/down spacer. Specification Case Dimensions 18.15mm(OD) x 17.6mm(ID) x 68.25mm(H) Top Cap 17.6mm(D) x 3.85mm(H) Top Cap with O ring 17.6mm(D) x 4mm(H) Top Insulator 17mm(D) x 0.12mm(H) with 6.5mm hole Bottom Insulator 17mm(D) x 0.12mm(H) with 6.5mm hole Material Case 304ss stainless steel cap Nickel plated steel Seal O-ring Nylon Insulating gasket PP 2. Electrochemical compatibility and potential matching In some cylindrical battery designs, the shell is connected as the negative current collector, and the steel shell is directly connected with the current collector (copper foil) of the negative electrode (graphite or silicon-based material) through welding or mechanical contact, which becomes the negative current path of the battery. 3. Adaptability of welding and sealing process The sealing of cylindrical batteries usually adopts laser welding process (such as the welding of the top cover and the shell). The high melting point (about 1400~1450°C) and low thermal conductivity (about 15 W/m·K) of stainless steel make it have a small heat-affected zone during welding, high weld strength and good sealing. However, aluminum shell welding requires protective gas (such as argon) and is prone to porosity, which makes the process more difficult. Some cylindrical batteries are mechanical...

Dear Valued Customers And Partners, As the Spring Festival, the most important traditional holiday in China, approaches, ACEY extends its warmest greetings to you and your team.  Our company will be on vacation from January 18th, 2025 to February 5th, 2025. During this period, if you have any urgent matters, please feel free to contact us through WhatsApp, Wechat, Email or Telephone. We will reply to you as soon as possible after the holiday ends. On behalf of our entire team, I would like to express our sincere gratitude for your trust and support in the past year. We look forward to continuing our successful cooperation in the new year and achieving more brilliant results together. May the new year bring you good health, abundant wealth, and every success in your business. Best regards, Acey Intelligent

Dear Valued Customers And Partners, As the holiday season approaches, we at Acey Intelligent Equipment would like to take a moment to express our heartfelt gratitude to our valued clients and partners. Wishing you a magical Christmas and a prosperous New Year! May the spirit of the season fill your heart with happiness. This year has been filled with challenges and achievements, and we are truly thankful for your continued support and collaboration. We look forward to continuing our partnership in 2025, working together to achieve new heights. Thank you for being an essential part of our journey. Warmest wishes, Acey Intelligent Equipment

Dear business partners, We hereby inform you that in order to ensure the long-term development of the company, we will upgrade from Xiamen Acey New Energy Technology Co., Ltd. to Xiamen Acey Intelligent Equipment Co., Ltd. from January 1, 2025. This upgrade reflects our commitment to providing innovative and intelligent solutions to our customers, and we believe that this will help us better serve our customers and partners in the future. The change of the company's business name will not affect the rights and obligations of our company to its business partners, all existing contracts and agreements will remain valid, and we will continue to provide the high-quality products and services that our customers expect. All our future business will be conducted using Xiamen Acey Intelligent Equipment Co., Ltd. from the specified date, and we look forward to your continued support and cooperation. Tuesday, December 24, 2024 Best Regards, Acey New Energy

2024 National Day Holiday Notice! To our valued business associates, clients and friends: Thank you for your trust and strong support to ACEY all the way! The National Day holiday in 2024 is approaching, and our company's holiday schedule is as follows: Holiday time: 7 days from October 1st to October 7th, 2024. Normal work will resume on October 8, 2024. If you have any inquiries or need assistance during this period, our sales team and engineer team will reply to you as soon as possible, we highly appreciate your attention and understanding. Best regards, Acey New Energy Emergency Contact : Allen Tang E-mail:allen@xmacey.com Tel&WhatsApp&Wechat:+8618950009155.

ACEY-PS8 8 channel prismatic battery automatic sorting machine is used to sort and assemble test of universal prismatic batteries. The machine adopts the belt line to drive the feeding, and the type change is simple. It can analyze and save the test data of the prismatic battery, eliminate the defective battery exclusively, and collect the battery with the sorting and matching by the receiving tank. It is easy for the operator to manage. Product Parameters Item No.: ACEY-PS8S Equipment efficiency 10~12PPM Equipment utilization ≥95% Number of sorting channels 8(7 qualified batteries, 1 unqualified) Applicable battery size Length: 100-220mm width 20-80mm height: 110-220mm Instrument internal resistance detection accuracy +/-0.5% rdg, the display resolution is 0.01 milliohm Instrument voltage detection accuracy +/-0.05% rdg, display resolution: 0.1 millivolts Internal resistance detection repetition error < 1 milliohm (AC internal resistance detection method) Voltage detection repetition error < 1 millivolt Control system PC Industrial Computer (Embedded system) Input power consumption 1KW Input voltage AC220V/50HZ Compressed air source ≥0.6Mpa Displayer 21.5-inch Philips displayer Equipment Appearance Reference dimensions L*W*H=1920*1600*1600mm Weight 350KG Product Details

Single Sided Spot Welding Machine for Lithium ion Battery Nickel Welding Single sided spot welding machine is used to weld nickel sheets with many lithium batteries into a group pack, which is suitable for lithium battery pack assembly in the factory for 14500 18650 21700 26650 32700 etc multi-parallel multi-series combination. Features Support breakpoint start, automatic start, and manual start. Cold solder joint and sealing off alarm. Easy program, support matrix, array and point program, can store 100 group parameters. Welding needle abrasion alarm. Build-in welding current monitor, can display real time welding current. Design for NB, Power Tool, Gardening Tool, High Power, Energy Storage battery, Electric Motor Car Battery Pack, and other lithium battery packs spot welding. Can be matched with the production line of lithium battery group. Can store dozens process of different battery packs product, switching products without re-setting parameters. Can match a variety brand of spot welders.

New Year Wishes and Holiday Notification! Dear Valued Customers, As the New Year approaches, we extend our sincerest wishes to you and your team. May the coming year bring joy, prosperity, and countless opportunities for growth. We sincerely appreciate all of our partners over the past year and look forward to continued success together. In view of the upcoming New Year celebrations, we would like to inform you of our company's holiday arrangements. We will be closed for holiday from December 30, 2023 until January 1, 2024, and during this holiday period we would like to assure you that we will continue to be committed to providing excellent service. Although our office will be closed, we welcome inquiries and orders throughout the holidays. So that we can arrange order production in time after the holidays to quickly meet your requirements. In the spirit of celebration, we are pleased to offer a special offer to our valued customers. Orders placed during the holidays will be eligible for exclusive discounts and promotions. Our team is committed to providing you with a seamless experience, even during the holidays. If you have any specific requirements, questions, or if we can provide you with any assistance, please feel free to contact our customer service team. As we bid farewell to the old and welcome the new, we would like to express our sincere gratitude for your trust and cooperation. May the new year bring prosperity, success, and continued growth to your business. warm regards, Acey New Energy