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Power battery thermal management is an important technology in the field of new energy vehicles, its role is to ensure that the temperature of the power battery can be within a safe range during the use of the vehicle, and improve the battery life and service life, thermal management materials are the technical support to achieve this goal. The following is an introduction to you: what thermal management materials are specifically needed for new energy vehicle power batteries. A  Thermally conductive materials Heat conductive materials play a key role in the thermal management of power batteries, at present, power batteries are often used: heat conduction paste, heat conduction sheet two types of heat conduction materials. The thermal conductivity of heat conduction paste is generally in the range of 1-8 W/mK, which is a thermal conductive material that transfers heat from the high temperature area to the low temperature area, and is usually used for the contact surface of the battery and the heat sink. The preparation of heat conduction paste can use diamond particles, silicon nitride and other thermal conductive particles as a carrier, and the theat conduction paste can fill fine voids and cracks, because this advantage is widely used in the thermal management of power batteries. The heat conduction sheet is usually made of copper or aluminum, and the thermal conductivity is often about 200 W/mK, which can not only evenly transfer heat from the surface of the battery to the nearby radiator, but also evenly cool the heat of the radiator and the surface of the battery, and at the same time improve the adsorption of the radiator to the battery and avoid the radiator falling off in the vibration state. B  Thermal barrier materials Thermal barrier material is a material that can slow down the flow of heat, and the thermal conductivity is often in the range of 0.2-0.35 W/mK, which has the characteristics of easy processing and molding.It is often used inside the battery module and installed between the battery cell and the radiator to reduce the temperature gradient, so as to reduce the surface temperature of the battery and ensure the safety of the battery. Thermal barrier materials include: insulating thermal insulation materials and composite thermal insulation materials.The main raw materials of insulation materials are glass fiber, ceramics, etc., which are often installed between the battery cell and the radiator to reduce the surface temperature of the battery.Composite thermal insulation materials are usually composed of a variety of performance materials, such as nano-silica and polymers, its role is to block the conduction between heat flow and current, the material has high strength and durability, so it is widely used. C  Phase change materials Phase change material is a kind of material that can absorb and release a large amount of heat energy, the melting point is usually very stable, when the charge reaches a certain tem...

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The concept of grading: In a fixed requirement environment, When the lithium battery is fully charged, Release of electricity under certain conditions, The amount of power released from the battery at this point is the capacity of the lithium-ion battery. Differentiation of lithium-ion batteries according to capacity, It's grading. Purpose of grading: 1.   Distinguish between capacity-qualified products and capacity-unqualified products. If the capacity meets the requirements, it is a qualified product. If the capacity is lower than the specification, it is a unqualified product. 2.   One of the means of classifying and grouping lithium-ion batteries. Selection of monomers with the same capacity and internal resistance, Such monomers with the same performance form a battery pack. Inconsistency in battery capacity can cause inconsistency in the depth of discharge of each individual cell in the battery pack. Batteries with smaller capacity and poorer performance will reach the full state of charge earlier, causing batteries with large capacity and good performance to fail to reach the full state of charge. Vantage: simple and convenient Disadvantage: The method is a static measurement method, which does not reflect the differences in the actual application of changes and has limitations. Method of grading 1.  Discharge capacity method Lithium-ion batteries are fully charged under certain conditions and then fully discharged at a certain current, Discharge current * time, is the discharge capacity of lithium-ion battery. Advantage: Capable of accurately and comprehensively reflecting the performance of lithium-ion battery discharge capacity, etc. Disadvantage: Longer time, affecting productivity 2.  Charge capacity method Lithium-ion batteries are charged to SOC1 under certain conditions, Then follow a charging method to reach SOC2,Calculate charging capacity between SOC1-SOC2, Compare the above relationship between charging capacity and final capacity of lithium-ion batteries, Estimate the actual discharge capacity of a lithium-ion battery. Advantage: Short time and high productivity Disadvantage: Existence of bias and misjudgement. 3.  Open circuit voltage method Li-ion batteries are charged at constant current to a certain SOC，determine the relationship between open circuit voltage and discharge capacity, discharge capacity deduced from open circuit voltage. Advantage: Short time and high productivity Disadvantage: Low accuracy of judgement, Not suitable for high-precision grading. TOB NEW ENERGY provide Formation And Grading Machine for cylindrical batteries, polymer batteries, and button cell.  Email : tob.amy@tobmachine.com  Skype :amywangbest86  Whatsapp/Phone number :+86 181 2071 5609

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The battery binder in lithium batteries is an essential component that ensures the effective performance of the battery. Lithium batteries are increasingly used in various electronic devices because of their high performance and long life span. The battery binder plays a critical role in keeping the battery components together, ensuring proper contact, and preventing any leakage. One of the key advantages of lithium batteries is their ability to provide high energy and power density, making them ideal for use in high-performance devices. The battery binder, being the glue that holds the battery components together, needs to have strong adhesive properties that can withstand the stresses and strains placed on the battery during use. As lithium batteries continue to grow in popularity, the demand for high-quality battery binders has increased. Manufacturers are constantly looking for new and innovative ways to improve the performance of their products, and the battery binder is an area where significant progress has been made. There are various types of battery binders used in lithium batteries, including: (1)Cathode Binder PVDF（Poly-vinylidene fluoride） It mainly refers to homopolymers of vinylidene fluoride and copolymers of vinylidene fluoride and other compounds. - Homopolymer class PVDF, is a homopolymer of VF2, such as HSV900, 5130, etc; - Copolymer class PVDF, the main use of VF2 (vinylidene fluoride) / HFP (hexafluoropropylene) copolymer, such as 2801, LBG, etc.. CH2=CF2→(CH2CF2)n (2)Anode Binder SBR Styrene-butadiene rubber emulsion: made by the polymerization of butadiene and styrene monomer and other functional monomers. Styrene emulsion: It mainly contains two monomers, styrene and acrylate. There are more types of acrylate monomers, commonly used ones include methyl acrylate, ethyl acrylate, methyl methacrylate and so on. The presence of ester group increases the affinity between binder and electrolyte; in addition, a large number of electronegative elements in the molecular chain (with lone pair of electrons, which will continuously complex/decomplex with lithium ions under the action of electric field, which is favorable for the diffusion of lithium ions), which leads to the outstanding low-temperature performance. Acrylates: also known as pure propylene emulsion, other functional monomers, such as acrylonitrile monomer, fluorine-containing monomers, etc., are generally introduced, which can satisfy the two factors of electrolyte swelling and electronegative element content at the same time, and thus have excellent kinetic performance. Email: tob.amy@tobmachine.com Skype: amywangbest86 Whatsapp/Phone number: +86 181 2071 5609

Manganese dioxide is a chemical compound that is used in the making of dry-cell batteries. It is used in the cathode of these batteries and it helps to make the electrical connection between the cathode and the anode. This compound is very useful in dry-cell batteries and has several advantages. First and foremost, manganese dioxide is a very stable compound that can withstand high temperatures and pressure. This makes it ideal for use in dry-cell batteries, which are often subjected to extreme heat and pressure. Furthermore, manganese dioxide is a very good conductor of electricity, which helps to increase the efficiency of dry-cell batteries. This means that they can store a lot of energy and discharge it quickly when needed. Another advantage of using manganese dioxide in dry-cell batteries is that it is very readily available. This means that it is affordable and can be easily sourced. This makes it an ideal compound for use in mass-produced items such as batteries. In addition, manganese dioxide is an environmentally friendly compound that does not contain any harmful chemicals. This means that it is safe to use and will not harm the environment. It is also completely biodegradable, which means that it can be easily disposed of without causing any harm to the environment. Overall, manganese dioxide is a very useful and beneficial compound when it comes to the production of dry-cell batteries. It is highly reliable, efficient, affordable, and environmentally friendly. Its many advantages make it the perfect choice for use in a wide range of applications, especially in the production of dry-cell batteries.

Lithium manganese iron phosphate (LiMnxFe1-xPO4, LMFP) is a new type of phosphate lithium-ion battery cathode material formed by doping a certain percentage of manganese (Mn) on the basis of lithium iron phosphate (LiFePO4, LFP), which is regarded as the "upgraded version of lithium iron phosphate". The doping of manganese element can make the advantageous features of both iron and manganese elements can be effectively combined, and manganese and iron are located in the fourth period of the periodic table and adjacent to each other, with similar ionic radius and some chemical properties, so the doping will not significantly affect the original structure. Compared with lithium iron phosphate High voltage: The charging voltage is increased from 3.4V to 4.1V for lithium iron phosphate. High energy density: Theoretical 15-20% increase in battery energy density, providing longer range, LFP has reached the upper limit. Low temperature performance improvement: LMFP has a capacity retention rate of 76% at -20°C, compared to 60-70% for LFP. Compared to ternary cathode materials Improved safety: LFP and LMFP are both olivine shaped structure, which is more stable than the layer oxide structure of ternary batteries. LFP and LMFP have olivine structure, which is more stable and safer than ternary batteries. Email: tob.amy@tobmachine.com Skype: amywangbest86 Whatsapp/Phone number: +86 181 2071 5609

1.Determination of iron content in anode graphite   The sample to be measured was dissolved under the condition of heating (1+1) HCl solution, and then the concentration of iron content in the sample to be measured was measured by atomic absorption spectrophotometer standard curve method.   Apparatus: Atomic absorption spectrometer, analytical balance, electric furnace, 250mL volumetric flask, 100mL volumetric flask, beaker, glass rod, funnel   Reagent: AR (1+1) hydrochloric acid   （1）Prepare standard solutions of Fe, 0 ppm, 0.5 ppm, 1 ppm and 1.5 ppm. （2）About 5 g of graphite was weighed in a 150 mL beaker in an analytical balance, 80 mL (1+1) of HCl was added and heated on a heating plate for about 30 min; the heated sample was cooled and filtered, fixed into a 100 mL volumetric flask, and the iron content was measured by atomic absorption spectrometry. （3）Turn on the computer→Open the instrument→Enter the working software→System reset (reset once per power on)→Tap OK after the reset is completed→Element selection→Condition setting→Wavelength positioning→Automatic energy to about 100%. （4）Open the air valve, adjust the output pressure 0.2~0.3MPa, then open the acetylene valve, adjust the pressure to 0.05~0.1MPa, press the host acetylene switch, adjust the acetylene switch to make the acetylene flow to the scale line, and ignite immediately. （5）The testing sequence is specimen blank→specimen blank→sample blank→sample test. Calculation：         2.Test method for particle size of negative graphite In the propagation of light, the wave source is restricted by the gap or particle of the same wavelength scale, and the emission of each element wave at the restricted source interferes in space to produce diffraction and scattering, and the spatial (angular) distribution of the diffracted and scattered light energy is related to the wavelength of the light wave and the scale of the gap or particle. With laser as the light source, the light is monochromatic with a certain wavelength, and the spatial (angular) distribution of diffracted and scattered light energy is only related to the particle size. For the diffraction of the particle group, the amount of each particle level determines the size of the light energy obtained at each specific angle, and the proportion of each specific angle light energy in the total light energy should reflect the distribution abundance of each particle level.   Instruments:laser particle size analyzer, ultrasonic cleaning machine, glass rod, beaker Reagent: Glycerol solution （1）Check whether the instrument power supply and water source are well connected. Turn on the power of the host (preheat for 30 minutes), then turn on the computer in turn to enter the instrument operation interface and turn on the water source. （2）Configure the dispersant: add a few drops of propanetriol to a 150mL beaker, dilute to 50mL with water, and mix well. （3）Sample preparation: add an appropria...