A lithium battery thermal runaway early warning protection system and method

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

Active Publication Date: 2020-12-01
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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  • A lithium battery thermal runaway early warning protection system and method
  • A lithium battery thermal runaway early warning protection system and method
  • A lithium battery thermal runaway early warning protection system and method

Examples

Experimental program
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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 a voltage drop, and the internal short circuit can be judged and warned by monitoring the voltage drop trend.

[0078] Thermal detection: to determine whether a short circuit occurs by attaching a thermocouple on the side wall of the lithium battery to detect temperature changes. In the prior art, since 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 cannot be fed back immediately.

[0079] Abnormal capacity detection: When an internal short circuit occurs, a part of the electric energy will be converted into heat and lost, so the capacity charged during the charging process will be higher than when no internal short circuit occu...

Embodiment 2

[0090] The abnormal voltage and current detection subsystem is the core of the thermal runaway warning and protection system in the automatic production of lithium batteries. Through real-time monitoring and tracking of voltage and current changes, the internal battery short circuit can be judged by using the law of voltage and current changes when the battery is short-circuited. and early warning. The abnormal voltage and current detection subsystem can usually stop the abnormal channel within 1 second after the internal short circuit occurs, preventing further aggravation of the negative reaction of the internal short circuit, thereby greatly reducing the probability of thermal runaway. In the composition and capacity process, the judgment and early warning of internal short circuit are realized by monitoring the abnormal trend of voltage during charging and discharging and the abnormal drop of current during discharging. Because the voltage and current abnormalities of the ...

Embodiment 3

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

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

[0135] filtering out the noise of the current data and dynamically updating the cached data;

[0136] determining the state of the lithium battery and calculating the rate of change of current;

[0137] The change rate of the current is compared with a preset current change rate threshold, and if the current change rate is greater than the preset current change rate threshold, the current change is abnor...

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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 thermal runaway warning and protection system for lithium batteries. Background technique [0002] In the back-end automated production process of lithium batteries (formation, capacity separation, standing, DCIR detection, etc.), the main causes of lithium battery heating and even explosion can be classified into the following two categories: 1. The SEI of the solid electrolyte interface film of the battery decomposes, falls off, or even reverses, accompanied by violent reactions such as heat generation and gas, and eventually causes thermal runaway. Since there is a special protection strategy for overcharge and overdischarge in the chemical composition and detection system, the thermal runaway caused by this reason can be avoided. 2. Lithium battery thermal runaway due to short circuit. Short circuit is divided into external short circuit and internal short circu...

Claims

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Application Information

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Patent Type & Authority Patents(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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