Lithium battery internal micro short-circuit hazard control methods
Author: Source: Datetime: 2016-10-06 10:53:47
Lithium battery internal micro-short-circuit hazard control must be from the single battery design, material selection, environmental process control and many other aspects to prevent internal micro-short circuit. Furthermore, in order to minimize the influence of the internal short-circuit of the single-cell battery, the chain reaction does not occur, and the following problems must be noted in the design of the battery pack, such as LiFePo4 battery pack.
1) single battery overheat isolation device
Single battery overheat isolation device can occur in the single-cell internal short-circuit or external shocks play a role in isolation, to stop the failure of the battery pack on the battery charge / forced overdischarge effect and to prevent failure of single cell high temperature, flame, Explosive caused by the adjacent unit cell interlocking, which play a blocking role.
2) single battery connection measures
The electrical connection of the cells in the battery pack (eg wires, nickel straps, setscrews) can cause local resistance to be too high, resulting in a high temperature in the area of the falling off point and causing internal shorts to adjacent cells.
3) to minimize the energy of single cells
Generally believed that the greater the energy of single cells, the number of groups of parallel and serial number of batteries less, the higher the reliability, which is from the parallel and parallel group reliability analysis is correct. However, if the single battery energy is too large, once out of control after the battery pack on the destructive power of the greater, in principle, the more likely to produce a chain reaction of the entire battery, resulting in uncontrollable situation. Therefore, it is important to select the proper cell energy design.
4) single battery series and parallel
Single battery series and parallel, the number of single-cell internal short-circuit, chain reaction has a great impact. For example, the series is likely to cause a single battery forced discharge, parallel single cell likely to cause a forced charging, may cause the single cell internal pressure, current is too large, resulting in an internal short circuit.
This requires more research and improvement on the consistency of the single cell and the symmetry design of the battery pack.
5) Temperature control system
Need to use the temperature control system to single cell, battery temperature control in a safe range to ensure safety. Temperature monitoring system, forced air cooling, water cooling, oil cooling have been examples of applications, and to gradually appear in the corresponding standards, for example used in solar powered portable generator.
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