A packaging structure and a packaging method for monitoring an internal state of a lithium battery

Abstract

The invention discloses an encapsulation structure and an encapsulation method for monitoring the internal state of a lithium battery, which is used for monitoring the internal state of the lithium battery by combining an ultrasonic technology and comprises a piezoelectric sheet and a shield layer. Two piezoelectric sheets are respectively located on both sides of the lithium battery, and two shielding layers are respectively bonded on the piezoelectric sheets on both sides of the lithium battery. The piezoelectric sheets are polarized in the thickness direction, and two sides of the piezoelectric sheets in the thickness direction are respectively provided with conductive layers connected with the signal lines. The invention has the advantages that the technical effect of quickly and accurately judging the internal state of the lithium battery is realized, and the signal-to-noise ratio of the ultrasonic wave outputted from the piezoelectric plate is improved; At the same time, the invention also greatly reduces the manufacturing cost of the lithium battery packaging structure, ensures the stability and consistency of ultrasonic wave propagation between the lithium battery and the two piezoelectric sheets, helps the lithium battery to dissipate heat and prevents the lithium battery from burning, and enhances the safety performance of the battery.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a packaging structure and packaging method for monitoring the internal state of a lithium battery. Background technique [0002] The current battery management system mainly uses temperature sensors, current sensors, and voltage sensors to monitor the internal state of lithium batteries, such as estimating the state of charge of the power battery pack, monitoring the health status of the power battery pack, and other functions. However, for the state of charge of the battery pack, although the voltage, current, and temperature are related to the state of charge of the lithium-ion battery, the relationship is not closely related. Precisely predict the state of charge. [0003] As for the state of health, although when the battery has a late safety problem, such as a short circuit caused by lithium dendrites caused by overcharging of the battery, the voltage, current, and temperature wi...

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Problems solved by technology

However, for the state of charge of the battery pack, although the voltage, current, and temperature are related to the state of charge of the lithium-ion battery, the relationship is not closely related. Precisely predict the state of charge

[0003] As for the state of health, although when the battery has a late safety problem, such as a short circuit caused by lithium dendrites caused by overcharging of the battery, the voltage, current, and temperature will all change and an alarm will be issued, but at this time a large amount of heat generated by the short circuit May cause the battery to go into thermal runaway and eventually catch fire

The three physical information of voltage, current, and temperature are difficult to give early warning of the battery's early health status;

[0004] The existing ultrasonic technology detects the internal state of lithium batteries mainly through relatively complex ultrasonic signal sources and ultrasonic signal receivers. Disadvantages such as technology incompatibility, so it cannot be integrated in existing lithium battery modules

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