Method and system for monitoring safety state of battery cell

Abstract

The invention discloses a method and a system for monitoring the safety state of a battery cell. The method for monitoring the safety state of the battery cell comprises the following steps: measuring the deformation quantity of the anti-explosion valve; when the deformation quantity of the explosion-proof valve is larger than or equal to a first deformation early warning value and smaller than a second deformation early warning value, a first early warning signal is sent out, the first deformation early warning value is the deformation quantity of the explosion-proof valve corresponding to the last period of the service life of the battery cell, and the second deformation early warning value is determined according to the lower limit deformation quantity of the explosion specification of the explosion-proof valve; and when the deformation quantity of the anti-explosion valve is larger than or equal to a second deformation early warning value, a second early warning signal is sent out. According to the technical scheme provided by the embodiment of the invention, potential safety hazards in the use process of the battery cell can be timely monitored and pre-warned.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of batteries, and in particular, to a method and system for monitoring the safety state of batteries. Background technique [0002] In the application process of batteries, safety cannot be challenged. How to identify safety risks and give timely warnings is particularly important. To solve this problem, the usual practice at the battery level is to add an explosion-proof valve design on the shell to avoid battery explosions. At the cell module and cell system level, the health status of the cell is simulated by monitoring changes in cell voltage, temperature, internal resistance, and capacity, and early warning measures and cut-off measures are designed at the cell system level. [0003] However, the existing monitoring or early warning measures have the following problems: the state of the explosion-proof valve is not monitored, and there is a possibility of serious safety acciden...

AI Technical Summary

Problems solved by technology

[0003] However, the existing monitoring or early warning measures have the following problems: the state of the explosion-proof valve is not monitored, and there is a possibility of serious safety accidents due to failure to identify the rupture of the explosion-proof valve of the battery cell in time; at the end of the life of the battery cell, the performance characteristics of the battery cell do not change suddenly , the risk of the cell explosion valve cannot be warned in time, such as the internal pressure of the cell is too high, resulting in an explosion valve

The above problems lead to the safety hazards in the use of batteries cannot be monitored and warned in time

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