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Internal resistance is one of the important indicators to evaluate the performance of lithium batteries. The test of internal resistance includes AC internal resistance and DC internal resistance. For single cell batteries, the AC internal resistance is generally evaluated as AC internal resistance, which is usually called ohmic internal resistance.  However, for large battery pack applications, such as power supply systems for electric vehicles, due to the limitations of test equipment and other aspects, it is not possible or convenient to directly test the AC internal resistance, and the characteristics of the battery pack are generally evaluated by DC internal resistance. In practical applications, DC internal resistance is also mostly used to evaluate the health of the battery, to make life prediction, and to make estimation of system SOC, output/input capacity, etc. In production, it can be used to detect phenomena such as faulty cells such as micro-short circuits.   The principle of DC internal resistance testing is to calculate the DC internal resistance of a battery by applying a high current (charging or discharging) to the battery or battery pack for a short period of time, before the battery has reached full internal polarization, based on the voltage change of the battery before and after the applied current and the applied current. Four parameters must be selected to test the DC internal resistance: current (or adopted multiplier), pulse time, state of charge (SOC), and test environment temperature. The variation of these parameters has a large impact on the DC internal resistance.   DC internal resistance not only includes the ohmic internal resistance part of the battery pack (AC internal resistance part), but also partly includes some polarization resistance of the battery pack. And the polarization of the battery is more influenced by the current, time and so on.   At present, the commonly used DC internal resistance test methods are the following three.   (1) HPPC test method in the U.S.《Freedom CAR Battery Test Manual》: the test duration is 10s, the applied discharge current is 5C or higher, and the charging current is 0.75 of the discharge current. the specific current selection is based on the characteristics of the battery to develop.   (2) Japanese JEVSD713 2003 test method, originally mainly for Ni/MH batteries, later also applied to lithium-ion batteries, first establish the current-voltage characteristic curve of the battery under 0~100% SOC, alternately charge or discharge the battery under the set SOC with the current of 1C, 2C, 5C, 10C, respectively, the charging or discharging time is 10s, and calculate the DC internal resistance of the battery. The DC internal resistance of the battery is calculated.   (3) The test method proposed in the "High Power Lithium-ion Power Battery Performance Test Specification for HEV" of China's "863" program, the test duration is 5s, the charging...

Power lithium batteries have been widely used in electric vehicles and energy storage systems due to their high energy density and long service life. However, the welding process of power lithium batteries is still a key factor affecting their performance and safety. Laser welding technology has become an important method for the manufacturing of power lithium batteries due to its high precision, fast welding speed, and good weld quality. Laser welding technology for power lithium batteries mainly includes two types: solid-state laser welding and fiber laser welding. Solid-state laser welding is suitable for welding thin materials and is widely used in the welding of battery cells, while fiber laser welding is suitable for welding thicker materials and is mainly used in the welding of battery modules. The welding process of power lithium batteries mainly includes material preparation, welding process optimization, and welding quality control. Before welding, the surface of the battery material must be cleaned to ensure a good welding effect. The welding process should be optimized according to the material properties and welding requirements, such as beam quality, welding speed, and energy distribution. During welding quality control, the welding seam should be inspected for defects such as porosity, cracks, and voids, and non-destructive testing should be carried out to ensure the welding quality. In conclusion, laser welding technology is a promising method for the production of power lithium batteries. It has the advantages of high precision, fast welding speed, and good weld quality, which can significantly improve the performance and safety of power lithium batteries. With the development of laser technology, the application of laser welding technology in power lithium batteries will become more widespread in the future.

TOB New Energy provides large batch order of the lithium-ion battery, sodium ion battery and supercapacitor cathode and anode materials: TOB NEW ENERGY provides batch order of cathode materials for lithium ion battery. NO. Item Product Name Model 1 LFP Cathode Materials Lithium iron phosphate Powder TOB-LFP-01 2 Lithium iron phosphate Powder TOB-LFP-02 3 Lithium iron phosphate Powder TOB-LFP-03 4 NMC Cathode Materials Lithium Nickel Manganese Cobalt 811 TOB-NMC-811 5 Lithium Nickel Manganese Cobalt 622 TOB-NMC-622 6 Lithium Nickel Manganese Cobalt 532 TOB-NMC-532 7 Lithium Nickel Manganese Cobalt 111 TOB-NMC-111 8 NCA Cathode Materials Lithium Nickel Cobalt Aluminum TOB-NCA 9 LMNO Cathode Materials LiNi0.5Mn1.5O4 Cathode Powder TOB-LNMO-1 10 LCO Cathode Materials Lithium cobalt oxide TOB-LCO 11 LMO Cathode Materials Lithium Manganese Dioxide TOB-LMO 12 Lithium-Rich Materials Lithium-Rich Manganese-Based Layered Oxide TOB-Li-rich 13 LMFP Cathode Powder Lithium Manganese Iron Phosphate TOB-LMFP TOB NEW ENERGY provides batch order of anode materials for lithium ion battery. NO. Item Product Name Model 1 Graphite Anode Natural Graphite Powder TOB-Graphite-T 2 High Rate High Capacity Artificial Graphite Powder TOB-Graphite-R 3 Artificial Graphite TOB-Graphite-R 4 MCMB Anode Mesocarbon Microbeads TOB-MCMB-S 5 Lithium Titanate Oxide Anode Carbon-coated LTO Anode Black Powder TOB-LTO-B 6 LTO Anode Powder TOB-LTO-W 7 Silicon Anode Different Particle Size Green Silicon Carbide TOB-SiC-Green 8 Carbon Coated Silicon TOB-S400A 9 Hard Carbon Anode Irregular Hard Carbon Powder TOB-Na-HC01 10 5μm Spherical Hard Carbon Powder TOB-Na-HC02

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Some of the coin cell laboratory equipment being loaded for delivery Planetary Ball Mill TOB-XQM-2 Vacuum Mixer TOB-XJB-500 Vacuum Oven TOB-DZF-6050 Roll Pres Machine TOB-DG-100L Coin Cell Crimper TOB-DF-160 Glove Box TOB-GB-1220 Coin Cell Disc Cutter TOB-CP60 Coating Machine TOB-VFC-300 The customer also chose our atmosphere furnace TOB-Q1200-40 The vacuum atmosphere furnace is widely used in the laboratory of higher education, scientific research institutes and industrial and mining enterprises for ceramics, metallurgy, electronics, glass, chemical industry, machinery, refractory materials, new materials development, special materials, building materials, metals, non-metals and other chemical and physical materials for sintering, melting, analysis, production and development of special equipment.

TOB-D-RY300 HOT PRESS MACHINE TOB-2681A SHORT CIRCUIT TESTER TOB-2050G4 TAB WELDING WITH CONNECTOR TOB-POC-160 CELL FEEDING MACHINE TOB-LKFJH-6 LASER SEALING MACHINE TOB-96CH-5V10A NEGATIVE PRESSURE FORMATION TOB-EF128-20K GRADING MACHINE and etc.

TOB-SCK-200 Polymer battery pouch forming machine TOB-M-DP-200 Semi-automatic stacking machine TOB-YF200 Vacuum pre-sealing machine TOB-USW-1500W Ultrasonic welding machine TOB-ZY65 Li ion battery vacuum diffusion chamber and electrolyte filling all-in-one machin TOB-SFZ-200 Top-side sealing machine Glove Box TOB-MQ300 Pouch cell electrode die cutting machine TOB-NDJ-5S viscometer TOB-AKF-CH6 Karl Fischer Moisture tester TOB-CT-4008-5V6A-S1 5V6A Battery tester with control unit TOB-CS3008 8 channels potentiostat

Equipment for coin cell lab line ready to ship Including: TOB-VFC-150 Film coating machine TOB-XJB-500 Lab planetary vacuum mixer TOB-JS-100L Hot roller press machine TOB-DZF-6050 Vacuum drying oven TOB-CP60 Manual coin cell disc cutter TOB-MR-120 Hydraulic crimping machine Email : tob.amy@tobmachine.com Skype : amywangbest86 Whatsapp/Phone number : +86 181 2071 5609