Power battery thermorunaway automatic alarm device and method

Abstract

The invention relates to a power battery thermorunaway automatic alarm device and method used for monitoring and alarming thermorunaway of power battery single bodies. The automatic alarm device comprises multiple fuse elements and further comprises a control circuit and a warning indicator, and all the fuse elements are arranged on all the battery single bodies or battery packs formed by two or more battery single bodies and fuse when surface temperature of a certain battery single body or battery pack reaches a certain threshold value; all the fuse elements are sequentially connected in series to form a fuse element string, one end of the fuse element string is sequentially connected with the control circuit and the warning indicator, the other end of the fuse element string is grounded, and the control circuit uses the audion connection characteristics when the fuse elements fuse for controlling the warning indicator to act to automatically give an alarm. The automatic alarm device is simple in structure, low in cost and high in practicability, achieves real-time monitoring of thermorunaway of the battery single bodies connected in parallel or series in the power battery packs and improves safety and reliability of heat management on the power battery packs.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an automatic alarm device and an automatic alarm method for thermal runaway of a power battery. Background technique [0002] At present, lithium-ion batteries are more and more widely used in the field of electric vehicles. Usually, lithium-ion batteries in electric vehicles need to be connected in series and parallel to realize group operation. Under abuse conditions, it is easy to cause battery thermal runaway. Therefore, in order to promote the application of new energy electric vehicles on a large scale, it is necessary to improve battery safety to avoid battery thermal runaway or reduce damage caused by battery thermal runaway. The current existing technology cannot completely avoid battery thermal runaway, so the early warning and protection technology of battery thermal runaway is essential. Battery thermal runaway refers to a reaction in which the battery ...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the thermal management of the existing power battery pack system and the monitoring of battery thermal runaway. Only a small number of temperature sensors are used to monitor the entire power battery pack, and it is impossible to realize all the temperature of each battery cell in the power battery pack. Monitoring, that is, the problem that the monitoring of thermal runaway of all battery cells cannot be realized. An automatic alarm device for thermal runaway of power batteries is provided. The fuse elements are respectively set on each battery cell or battery pack connected in series and parallel, and the f

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