How do lithium battery manufacturers solve the problem of safety and consistency of power battery systems? Domestic power battery manufacturing equipment industry equipment after more than 20 years of rapid development, although there has been great progress in function and precision, but the process and automation level is still dominated by the segmentation of the single machine automation-based intelligence, the lack of overall system integration technology.
It is well known that power battery products to achieve safety, high energy density and better high and low temperature performance, need to have a high degree of consistency, but the consistency and stability of China's power battery has long been criticized. And this has an important relationship with the domestic battery manufacturing process, quality control and equipment level is relatively backward.
How to solve the problem of power battery system safety
①The safety of the power battery system must be solved by the electric cell. To ensure safety, the electric cell must use more stable materials and safer design.
②Improve by adding additives to the electrolyte to reduce its flammability, improve the temperature resistance of the diaphragm or improve the stability of the cathode material; module design by strengthening the temperature control design, BMS charging management or change the single connection to improve safety; vehicle level can be placed through the location of the battery to better heat dissipation, improve charging methods to reduce the safety risks caused by improper charging.
③ The current testing standards cannot completely eliminate the safety of power batteries. Power battery is a flammable material, its energy density is high, there are positive and negative electrodes, the heat in the process of use will bring thermal runaway problem. At present, from the battery body technology to strengthen technical research, about 5-10 years can do to ensure the safety of power batteries.
④The safety of the power battery is closely related to the management level and manufacturing level of the battery factory. To improve the safety and reliability of the battery, it is necessary to gradually improve in all aspects, to run through the various aspects of production management.
The reasons for the inconsistency of power battery performance are mainly reflected in two aspects: the absolute inconsistency generated by the cell manufacturing process and the relative inconsistency of the battery pack assembly application process. At present, domestic battery equipment manufacturers mainly improve the performance inconsistency in cell manufacturing through segmented automation equipment, while the semi-automated way of manual clamping, single machine sampling and manual sorting is still mainly used in cell formation and sub-volume, ignoring the relative consistency of battery assembly.
How to solve the problem of power battery system consistency
1, cell consistency improvement: minimize the number of material suppliers, the larger the batch of materials and batteries, the more conducive to improving consistency and reducing batch differences; try to improve the degree of automation of equipment, select high-precision, high stability equipment is conducive to improving the consistency of the battery.
2、Strict consistency screening must be carried out when the power battery is assembled: the specifications of the battery assembling technique should be complete, scientific, reasonable and feasible; the larger the batch of products produced in the same batch, the more consistency is guaranteed, and the mixed batch assembling is strictly controlled.
3、Increase the safety protection equalization detection circuit or place the device that can be balanced maintenance: ensure that the equalization function of the battery protection system is really effective to prevent overcharge and overdischarge; the design of the protection system should be scientific, reasonable and reliable in quality.
4, thermal management: for the internal resistance of inconsistent cells, the generation of heat is not the same problem. The addition of thermal management system can regulate the temperature difference of the whole battery pack to keep it in a small range. The cell that generates more heat still has a high temperature rise, but it will not pull away from other cells, and the deterioration level will not be significantly different.
Factors affecting the safe use and cycle life of the battery, in addition to the battery's own process and product quality, a critical issue is: the safety control and thermal management technology when charging the battery as a group. Without perfect battery group safety control and thermal management technology, battery safety and long life cycle can not be guaranteed, therefore, the power battery charging management system is as important as the safety of the battery itself.
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