Thermal runaway early warning protection system and method for lithium battery

A protection system, lithium battery technology, used in secondary battery repair/maintenance, battery, secondary battery testing, etc.

Active Publication Date: 2019-10-18
GUANGDONG HYNN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the existing problems, the present invention provides a lithium battery thermal runaway early warning protection system and method

Method used

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  • Thermal runaway early warning protection system and method for lithium battery
  • Thermal runaway early warning protection system and method for lithium battery
  • Thermal runaway early warning protection system and method for lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In the automatic production of lithium batteries, the internal short circuit detection methods of lithium batteries include the following:

[0077] Voltage abnormality detection: The internal short circuit of the lithium battery will cause the voltage to drop, and the internal short circuit can be judged and warned by monitoring the voltage drop trend.

[0078] Thermal detection: determine whether a short circuit occurs by attaching a thermocouple to the side wall of the lithium battery to detect temperature changes. In the prior art, since the heat is conducted from the inside to the outside when a short circuit occurs, there is a certain lag in the temperature display, so that the short circuit situation cannot be fed back at the first time.

[0079] Capacity abnormality detection: When an internal short circuit occurs, a part of the electric energy will be converted into heat energy and dissipated, so the capacity charged during the charging process will be higher th...

Embodiment 2

[0090] The voltage and current abnormality detection subsystem is the core of the thermal runaway early warning protection system in the automatic production of lithium batteries. By monitoring and tracking the changes of voltage and current in real time, and using the law of voltage and current changes in the battery's internal short circuit, it can judge the internal battery short circuit. and warning. The voltage and current anomaly detection subsystem can usually stop the abnormal channel within 1 second of the occurrence of the internal short circuit to prevent the further aggravation of the negative reaction of the internal short circuit, thereby greatly reducing the probability of thermal runaway. In the chemical composition process, the judgment and early warning of internal short circuit are realized by monitoring the abnormal trend of the voltage during charging and discharging and the abnormal drop of the current during discharging. Because the voltage and current a...

Embodiment 3

[0133] In an embodiment of the present invention, a method for detecting abnormality of internal short-circuit voltage and current in the automatic production of lithium batteries, the lithium battery is in a state of constant current charging, constant voltage charging or constant current discharging, and the corresponding current abnormality is: constant current Abnormal current charging, abnormal constant voltage charging or abnormal constant current discharging.

[0134] like Figure 7 As shown, judging whether the current data is abnormal includes the following steps:

[0135] Filter out the noise of the current data and dynamically update the cached data;

[0136] determine the state of the lithium battery and calculate the rate of change of current;

[0137] The current change rate is compared with a preset current change rate threshold. If the current change rate is greater than the preset current change rate threshold, the current changes abnormally.

[0138] Calcu...

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Abstract

The invention provides a thermal runaway early warning protection system for a lithium battery. The system comprises a voltage and current anomaly detection subsystem, a temperature anomaly detectionsubsystem and a smoke induction anomaly detection subsystem, wherein the voltage and current anomaly detection subsystem is used for collecting voltage data at two ends of the lithium battery and dataof current going through the lithium battery in real time in the charge and discharge processes of the lithium battery so as to judge whether the voltage data and the data of current are abnormal, and charging and discharging are stopped when voltage and / or current are / is abnormal; the temperature anomaly detection subsystem is used for collecting the temperature of the lithium battery in real time in the charge and discharge processes of the lithium battery so as to judge whether the temperature exceeds a preset temperature threshold value, and when the temperature exceeds the temperature threshold value, a temperature anomaly alarm is given; and the smoke induction anomaly detection subsystem is used for detecting whether smoke exists in real time in the charge and discharge processes of the lithium battery, and when the smoke is detected, an alarm and a fire sprinkler are started. Thermal runaway early warning for the lithium battery is realized through synergistic effect of the three subsystems, so that negative effects caused by thermal runaway are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery thermal runaway warning protection system. Background technique [0002] In the back-end automated production process of lithium batteries (formation, volume separation, standing, DCIR detection, etc.), the main reasons for causing lithium batteries to heat up or even explode can be classified into the following two categories: 1. Lithium batteries caused by overcharge or overdischarge The SEI of the solid electrolyte interface film of the battery is decomposed, peeled off, or even reversed, accompanied by violent reactions such as heat generation and gas, and eventually lead to thermal runaway. Thermal runaway caused by this reason can be avoided due to the special protection strategy for overcharge and overdischarge in the chemical composition and detection system. 2. Thermal runaway of lithium battery due to short circuit. Short circuits are divid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42G01R31/382G01R31/389
CPCG01R31/382G01R31/389H01M10/4285H01M2200/00H01M2200/10Y02E60/10
Inventor 赵少华王守模
Owner GUANGDONG HYNN TECH CO LTD
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