Temperature characteristic analysis of lithium ion power battery

Source: 2020 - 04 - 11 19:03 hits: lithium ion power battery temperature rise characteristic analysis in this paper: in today's rapid development of lithium ion power battery, its safety performance is more and more get the attention of people, which is one of the main factors influencing the battery safety performance. In order to study the battery in the process of heat dissipation, according to the temperature rise of lithium ion power battery discharge data simulation nickel cobalt manganese ternary material and lithium iron phosphate batteries and different model of equivalent specific heat capacity of lithium iron phosphate batteries, the results showed that the cell and the structure of the cell battery production material two aspects have an impact on the equivalent specific heat capacity and the battery temperature data, the ternary material battery temperature rise faster than batteries, lithium iron phosphate battery cooling system of big size table is long is poor, temperature rise faster. This conclusion for the battery manufacturing processes and material selection provides the basis, in order to improve the safety of the lithium ion battery performance provides the data support for the development of lithium ion battery has a deep and meaningful impact. 【 Keywords 】 Lithium ion power battery. The equivalent specific heat; Selection of materials; Battery structure; The rise of temperature of the battery lithium ion battery has small volume, high voltage, large capacity and good cycle performance, no pollution, no memory effect, etc. In recent years, the rapid development of the market both at home and abroad, has become a new generation of after the nimh rechargeable battery. Lithium ion battery in electronic components, electric vehicles, aerospace and other fields has a broad application prospect. And lithium batteries, lithium ion power battery, in particular, in use process in the form of a battery, a single cell in the dense accumulation state. As a result, the batteries to problem has plagued the people, and the security problem of the lithium ion battery has been hampering the development of lithium ion batteries. In use process and storage process, because the battery material, structure, different working conditions, the heat generated by the different levels of lithium ion can not get timely loss, leading to the accumulation of internal heat, the temperature rise, lead to the battery inside the side effects of a series of spontaneous heat, these side effects will accelerate cell temperature increases, eventually lead to the thermal runaway of the battery, causing potential safety hazard. Therefore, heating and cooling performance of the battery use is of great significance to the safety of the battery, the battery structure optimization design and health management also has the very vital significance. Battery material influence on the heat capacity battery at present, lithium ion battery heating security problems caused by the great negative impact on consumers, restricting the development of lithium ion batteries. The choice of electrode material in a certain extent determines the thermal capacity of the battery, the thermal stability of lithium-ion batteries is the result of the electrode material itself and synergy. By comparing the nickel cobalt manganese acid lithium battery and lithium iron phosphate batteries ternary material heat capacity, you can find the ternary battery safety performance to a certain extent, is inferior to lithium iron phosphate batteries, and three yuan watt-hour battery unit costs and better than that of lithium iron phosphate battery voltage platform, but its safety factors seriously affect the use and development of the battery, thus lowering the temperature rise of the ternary battery, optimization of cooling system of the ternary battery development has the profound significance. Battery material choice to a certain extent, determines the safety performance of the battery and even life. Therefore, the battery cost be taken into account when choosing battery materials, voltage and temperature effect. Battery structure on the influence of the heat capacity of lithium-ion batteries battery temperature rise is the result of the battery heat, thermal conductivity and thermal diffusion. Battery directly influences the structure of heat conduction and thermal diffusion, which affects the battery in the temperature in the process of running.