Lithium battery protection system and lithium battery

Abstract

The embodiment of the invention discloses a lithium battery protection system and a lithium battery, the lithium battery protection system comprises a filter circuit, a switch circuit, a temperature detection circuit and an overcurrent protection circuit, the overcurrent protection circuit comprises a current generation circuit, a voltage regulation circuit and a comparison circuit, the temperature detection circuit is used for detecting the temperature of the lithium battery and adjusting self resistance according to the detected temperature; the voltage regulation circuit is used for adjusting the voltage of the first input end of the comparison circuit according to the current output by the current generation circuit; and the comparison circuit is used for controlling the switch-on or switch-off of the switch circuit according to the magnitude relationship between the voltage of the first input end and the voltage of the second input end of the comparison circuit. According to the technical scheme provided by the embodiment of the invention, the over-current value of the protection system can be adjusted by detecting the temperature of the lithium battery, so that the over-current value changes along with the temperature change of the lithium battery, the characteristic requirements of the lithium battery at different temperatures are met, and the working stability, safety and reliability of the lithium battery are further ensured.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of battery protection, and in particular to a lithium battery protection system and a lithium battery. Background technique [0002] With the advancement of science and technology, electronic products such as mobile phones, electronic cigarettes, mobile power supplies, TWS (True Wireless Stereo Sound) earphones, and smart bracelets and watches that use lithium batteries as power supplies have become popular. [0003] At present, the lithium battery protection circuit is usually used to protect the charging and discharging of the lithium battery, but the overcurrent value of the lithium battery protection circuit in the prior art does not change with the temperature of the battery, and is constant relative to the battery temperature, so that the maximum charging current of the lithium battery Or the maximum discharge current remains unchanged, therefore, it is easy to cause damage to...

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Problems solved by technology

[0003] At present, the lithium battery protection circuit is usually used to protect the charging and discharging of the lithium battery, but the overcurrent value of the lithium battery protection circuit in the prior art does not change with the temperature of the battery , the relative battery temperature is constant, so that the maximum charging current or maximum discharge current of the lithium battery remains unchanged. Therefore, it is easy to cause damage to the lithium battery under different operating conditions and affect the service life of the lithium battery. In severe cases, it will also damage the lithium battery. Battery

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