Factors affecting the low-temperature characteristics of lithium iron phosphate batteries, although lithium iron phosphate batteries have many advantages over other rechargeable batteries in terms of service life and time of the circulating system, at low temperatures, their performance is worse. Therefore, it is more reasonable to improve the low-temperature performance of lithium iron phosphate batteries.
Customization of various high-quality industrial lithium battery packs
1.Cathode. The conductivity of the electronic devices of the charging electrode material of lithium iron phosphate battery is relatively weak, which is easy to cause polarization and reduce the lithium capacitance.
2.Negative electrode. The negative potential of lithium-ion batteries is very harmful to ultra-low temperature batteries, and seriously endangers the safety of rechargeable batteries.
3.Lithium battery electrolyte。In the ultra-low temperature natural environment, the viscosity of the lithium battery electrolyte in the rechargeable battery increases, which improves the characteristic impedance of the lithium-ion battery.
A method for improving the low-temperature characteristics of lithium iron phosphate batteries
1.Cathode. Grain size, resistance, and planar axis size all have a detrimental effect on the ultra-low temperature characteristics of lithium-ion batteries. The ultra-low temperature charge-discharge characteristics of lithium ions are improved in terms of processing technology. Increasing the length of the floor plan can increase the safety channel for lithium-ion batteries, which helps to increase the multiple of rechargeable batteries. The ultra-low temperature charging and discharging effect of LiFePO4 batteries with different particle sizes is better in the ultra-low temperature charging and discharging effect.
2.Negative electrode. For ultra-low temperature lithium-iron-phosphorus battery rechargeable batteries, the hazard factor is a negative value, which depends on the magnitude of the negative value and the interval change of the negative value. Synthetic high-purity graphite with different sheet spacing and particle size of battery cathode materials, high-purity graphite with large embedded particles, its own resistance characteristics and positive ion transfer characteristics are smaller from the perspective of antigens. With the increase of high-purity graphite spacing and the decrease of grain size, lithium phosphate batteries charged at ultra-low temperatures using constant current power batteries have been greatly improved.
3.Lithium battery electrolyteAt temperatures of minus 20 degrees Celsius or even lower, the lithium iron phosphate battery in the electrolyte of lithium batteries is easy to freeze and swell, leading to the deterioration of characteristics. The experimental results show that the harm of organic solvents to the ultra-low temperature of rechargeable batteries is between 70% and 90%, and is as high as 10 points. Different lithium salts also have a negative effect on the charging characteristics of ultra-low temperature rechargeable batteries. In the case of changing only the preservative, the experiment found that the ultra-low temperature preservative can increase the charging and discharging capacity of the battery from 85% to 90%.
According to the composition of the internal material layer of the rechargeable battery, the methods and key points for improving and improving the ultra-low temperature characteristics of lithium iron phosphate battery are proposed. In fact, in order to make the characteristics of rechargeable batteries at ultra-low temperatures, it is not only necessary to improve the composition of raw materials inside the battery, but also to improve the intelligent management system of rechargeable batteries and the general circulation system to be more effective.
A key way to improve the energy density of lithium batteries
There are three key ways to improve the energy density of lithium batteries:
1. Increase the specific capacity of the rechargeable battery;
2. Increase the working voltage of the rechargeable battery.
3.The trend of higher operating frequencies of cathode materials for batteries. In order to complete the management system of high-voltage rechargeable batteries, lithium battery electrolysis is particularly important. It must take into account not only the higher requirements of positive levels for the oxidation resistance of air, but also the provisions that translate to stability at negative levels.
In order to increase the energy density of lithium batteries, it is necessary to increase the proportion of positive and negative active substances in lithium batteries. Lithium batteries are composed of positive and negative active substances, diaphragms, copper, platinum, aluminum panels, etc., which is the most effective way to increase the proportion of active substances in lithium batteries.
In addition to expanding lithium batteries, a reasonable way to improve the energy density of lithium batteries is to reduce the thickness of the film, many lithium battery manufacturers widely use films containing thin films, the thickness of the film can be less than 20 microns, which can greatly reduce the volume ratio of the film, increase the occupancy rate of active substances, and improve the energy density of lithium batteries under the premise of ensuring the safety of lithium batteries.
In addition, one way to increase the proportion of active substances is based on the point of view of the production process of rechargeable batteries, one is to increase the proportion of active substances in the power level. In order to increase the proportion of active substances, it is necessary to reduce the proportion of active substances and reduce the proportion of inactive substances depending on the selection of new conductive agents, adhesives and reduced ratios of conductive agents and binders. Second, positive and negative sizing must be increased.
The application of 3C lithium improves the specific energy, and the application of 3C lithium power supply should also pay attention to its detection, which is closely related to its characteristics, so it is necessary to select a suitable contact group for current conduction and data signal transmission. The spring microneedle beautiful touch group can be used for 3C lithium battery detection, and maintain long-term printing when transmitting large current, and the smooth needle continuous needle has excellent characteristics, and the average use cycle is more than 20W, which should be 3C lithium battery high-frequency detection, which can maintain long-term stable touch and improve detection efficiency.