Thermal runaway is the main cause of battery safety problems, so what causes thermal runaway of lithium batteries?
 
First, the external factors of the battery. If the ambient temperature of the battery is too high, and the battery does not dissipate heat well, or the internal winding is poor, resulting in poor battery heat dissipation. In addition, companies need to pay special attention to another situation, that is, the battery spine is sometimes hot. The metal spine of the battery has copper and aluminum and has a relatively good thermal conductivity. For circuits in components with some high heat sources, it is important to ensure that they are kept away from the battery spine to adequately dissipate heat.
 
Again, the internal factors of the battery. One is a micro-short circuit. There are two types of micro-short circuits.
 
One is the short circuit in the battery production process, including burrs; the other is the use of the process in the short circuit, these situations will lead to the micro-short circuit and make the local temperature of the battery is higher than the thermal runaway temperature, which in turn leads to thermal runaway phenomenon.
 
The second reason is the battery overcharge, which will reduce the thermal runaway temperature of the material after overcharging. In the use in the later stages, the capacity of the battery will drop. At this point, the battery itself is already in an overcharged state, and the thermal runaway temperature will naturally drop; the third is the amount of electrolyte. If the amount is too much, the explosion will be very harmful and the flame will be ejected very high or even far, so the amount of electrolyte must be strictly controlled.
 
Taking flexible pack batteries as an example, flexible pack lithium batteries are another name for polymer batteries. Compared with cylindrical and square lithium batteries, they have the advantages of small size, lightweight, high specific energy, high safety and design flexibility. The main difference between them is the stainless steel case or aluminum case used for square and cylindrical batteries. Flexible packaged batteries are manufactured using stacked manufacturing methods, so they are smaller in size and weight for the same bulk density and weight. lightest. However, there are still many practical issues on the technology path for flexible packaging batteries. First of all, the high cost and limited technology level of aluminum-plastic film technology, especially in terms of control of the lamination technology, requires more winding.
 
Quality control issues will directly affect battery life and safety issues. Therefore, manufacturers of flexible packaging lithium batteries place great emphasis on internal inspection. The development of flexible packaging batteries has benefited from the trend towards smaller, thinner and lighter consumer electronics. Smaller size means more difficult to inspect.
 
 
 

Lithium Batteries for electric vehicles need proper testing. While testing, battery explosion can happen so we need an explosion-free test chamber. In this article, we will discuss a very useful walk-in explosion-proof test chamber. Using electric energy keeps growing steadily on earth. Lithium-ion batteries are chiefly utilized in such instances, so they’re studied from the previous decades, together with the intention to increase the degree of basic security ensured within their own performance. Anyway, basic protection problems remain, and the most important issue is to prevent the growth of poisonous incidents.

These incidents might be affiliated with short circuits, including over-charge/over-discharge electrical currents and overheating. These risky conditions can cause exothermic chain responses in the storage technique, which may discharge hazardous or sterile gases and, lastly, catch fire. These issues need to get confirmed in lots of software and specifically when manufacturers test lithium-ion batteries in Explosive ambiance. The aim of explosion resistant battery test chamber would be that the test of this absolute most safe variety of Lithium battery testing innovation is a way to decrease the potential ignition origin into the surroundings with the existence of explosive ambiance. Moreover, we also examine the capability of this Battery test chamber to take out the ignition hazard remaining while testing its integrity level to provide a decent vulnerability.

Is There Any Chance of Explosion While Testing Batteries?

Throughout the thermal cycling test, there will probably be no signs of rust related to elevated voltage, electrolyte leakage, ventilation, explosion, or fire. Usually, every time an EV battery packs under thermal runaway, it will move heat to adjoin cells through conductive, convective, and radiative heat transport manners. Without the heat transport, the inducing responses to make a flame, in rather rare conditions, explosion. A thermal runaway at one single cell can occur for the nearby battery cells.

While charging at elevated speeds in a rather cold temperature after charging, a busted battery could result in an explosion or fire. Cells which are utilizing non-aqueous electrolytes, such as lithium-ion life possess specified venting mechanics to preclude rupture or burst. Over-charging of both EV batteries may cause thermal energy reduction because of the current. It causes a reduction of chemical compound equilibrium as a result of elevated temperature. Intense events like explosions or fire might possibly come about.

Over-discharging of all batteries has an exclusive chemical response that may come about and which are irreversible. After charging of this kind of over-discharged EV batteries might possibly result in an explosion or fire.

What Kinds of Tests Can Be Done with The Chamber?

A Walk-in explosion-proof chamber can test a very dangerous event after a battery collapse when thermal runaway occurs. However, the intensity of the impacts depends on many facets like the sum of electricity stored at the mobile, which is also a role of mobile fever, cellular dimensions, and faculties (like mechanical and chemistry style).

The chamber raises the voltage using over-discharge test procedures. Thermal abuse rechargeable ion cells are allowed to run inside a particular temperature array to prevent danger in the event of overly large (or low) temperature worth.

Overcharge comes about once the battery has been charged with a voltage more than the producer’s limitation. Overcharge mainly signifies an occurrence of power decrease of the general technique.

Benefits of Using Walk-In Explosion Proof Battery Test Chambers

For much more substantial, possibly volatile samples necessitates a bigger chamber with additional safety capabilities. This assortment of chambers has pressure discount vents, burst evidence chains in addition to a lengthy collection of optional characteristics. The walk-in explosion-proof chambers are easy to program.

Test Chambers are developed for analyzing the DUT/UUT’s operation of thermal endurance, dryness-endurance, convenient for R&D, and excellent controllers from these sectors: electronic equipment, electric fittings, vehicles, PV modules, and monitor panels, packing, etc.

Why is the DGBell Explosion Proof Chamber Best in the Market?

• DGBell walk-in explosion-proof chamber cushioned touchscreen display humidity and temperature control, together with computerized calculation of PID functionality.
• Many protection security apparatuses like congestion and outage security, compressor over-pressure safety, trickle fusing defense, and sound indication alarms.
• The insulation technique employs super-fine wrought iron wool or polyurethane foam to ensure the warmth of the interior chamber.
• The Walk-in Battery Explosion-proof substantial Chamber is created from high-quality metal stuff. The outer shell adopts a-3 metal plate, top electrostatic spraying.
• Highly effective multi-wing sort airflow, which may assure even temperature distribution within the operating room.
• Walk-in Sort Explosion-proof substantial and very low-Stress Test Chamber comprises this room, heating systems, and heating system, airflow system, and controller platform.

Conclusion

Explosion-proof examination Chambers offer the most strength and effectiveness for the toughest battery evaluation prerequisites. Built-in complete safety capabilities will stop the room from inducing any tripping to safeguard your services and products and assure operator security.

IEC 62619 specifies tests and requirements for secure secondary lithium batteries and cells used in industrial uses such as static applications. When there is an IEC 62619 standard specifying evaluation requirements and prerequisites of cells used in particular applications and will be in conflict with this record, the former takes precedence. Listed here are a few examples of software that use batteries and cells under this document’s scope. Because IEC 62619 covers, batteries for various industrial uses, it comprises these requirements, which might be typical and minimal to the several software. Electrical safety is included only as part of the risk evaluation of Clause 8.

Regarding details for fixing electrical security, the end-use program standard requirements need to be thought about. This test applies to batteries and cells. If the battery is split into smaller components, the more compact device can be analyzed as the owner of this battery. The producer acknowledges the unit. The maker may add works that exist in the last battery in the unit that is tested.

Types of Battery Test Required for IEC 62619 Standard

Tests for Battery Cells

• Topical Short Circuit Short-Circuit between the negative and positive terminals will not result in a fire or explosion IEC 62619 Cl. 7.2.1 2.
• Impact An effect on the mobile shall not lead to explosion or fire IEC 62619 Cl. 7.2.2 3.
• Drop Test A fall of a mobile or cell block battery system will not result in explosion or fire IEC 62619 Cl. 7.2.3 4.
• Thermal abuse An elevated temperature of a mobile or cell block will not lead to explosion or fire IEC 62619 Cl. 7.2.4 5.
• Overcharge Charging for longer spans than given by the manufacturer will not result in a fire or explosion IEC 62619 Cl. 7.2.5 6.
• Forced Discharge A mobile in a multi-cell program will withstand a driven release without causing a fire or explosion

Types of Tests for Battery Systems

• Propagation/internal thermal event A driven inner short-circuit with at a Mobile won’t lead to the fire of the whole Battery fire, or system transports IEC 62619 7.3.3 2
• Overcharge with voltage The BMS will control the charging voltage cells. IEC 62619 8.2.2 3
• Overcharge with present In case the input to the cells and Batteries surpasses the maximum charging Present of these cells, the BMS shall disrupt the Charging to safeguard the battery system from Risks associated with charging currents above the Cells given maximum charging current IEC 62619 8.2.3 4
• Overheating control, The BMS shall finish charging once the Temperature of these cells and battery Exceeds the upper limit given by the Cell maker IEC 62619 8.2.4 5
• Capacity validation This evaluation determines firsthand the capacity A mobile holds after storage for a protracted period. Second, the capacity which Can be retrieved by a subsequent recharge.

IEC 62619 Test Standard Battery Test Chamber

Thermal Abuse Test Chamber

A security issue of IEC 62619 particular interest is a situation called thermal runaway where a couple of exothermic side reactions happen, resulting in elevated temperature ranges, which in turn cause an uncontrollable and excessive discharge of warmth. This work aims to clarify the impact of the reactions by using a thermal abuse model that forecasts single-cell behavior when exposed to an elevated temperature. The experimental evaluation of the thermal security conduct comprises a constant-power heating component to activate a thermal runaway occasion. This analysis takes a present thermal abuse version and transforms it to emulate the conditions through a constant-power warming evaluation. The outcome is shown to be in agreement with the experimental data to various mobile configurations with the thermal abuse test chamber’s help. The effect of convection illness, mobile physical setup, and electrolyte combustion around the mobile thermal behavior can also be researched.

Traction Battery Drop Tester

• Single Storage Mobile Security Evaluation Drop testing
• Charge the Only storage Mobile Based on IEC 62619 6.1.3
• Reduce the Favorable negative terminals of the Mobile from the Elevation of 1.5m to the concrete floor
• Watch for 1hBattery Module Safety TestCharge the battery module in accordance with the Conventional IEC 62619 6.1.4
• Fall the Favorable negative terminals of the battery in the height of 1.2m to the concrete Ground Watch for 1h

Thermal Runaway Test Machine

Thermal runaway battery test chamber test procedure applies to most RESS-equipped HEV, PHEV, and EV vehicles.  For IEC 62619 standard specific guidance was provided for the use of the processes to home-based predicated RESS systems as Li-ion mobile chemistry is your dominant chemistry in RESS in the time of the writing, but the approach provided can be applied to a selection of other mobile chemistries.

The evaluation procedure described consists of 3 components:

1. Choosing a Proper single mobile thermal runaway initiating methodology,
2. Verifying the thermal runaway initiation methodology in voucher or module level evaluations
3. Complete scale; in-vehicle testing to evaluate if one cell thermal runaway inside a RESS can provide a hazard signal for significant automobile accessories.

Large Current Battery Short Circuit Test

A large current battery short circuit test chamber is to assess the electric performance or security of lithium-ion batteries and other secondary batteries consisting of constant charging evaluations, external short circuit evaluations, overcharging evaluations, over-discharging, and large-current evaluations.  Topical short circuit tests simulate incorrect battery utilization. These evaluations include short-circuiting a battery from external to simulate usage that might lead to fire or rupture.  DGBell can execute external short circuit tests using high currents of around 16 kA (a world-first) and in non – to high-temperature environments. Together with these brief circuit tests, we also supply an extensive selection of testing/certification solutions for compliance with IEC 62619 supply safety testing, evaluation consulting and consulting services for automobile battery packs/modules, and energy storage devices.

Heavy Impact Battery Tester

This heavy impact battery test chamber has gained broad acceptance in analyzing the effect resistance of various lithium batteries.  It’s also widely utilized to establish quality management criteria for resistance to affect surface damage and comprehension of several materials.

According to the heavy impact tester, this battery affects the battery’s tester protection via various weights, different heights, and various impact locations.  Following a series of evaluations with this particular battery influence tester, the battery shouldn’t have fire or explosion.

Conclusion

IEC 62619 test applies to accept Lithium-ion battery programs utilized in ships and offshore installations classed or meant to be classed with the battery test system. This Classification note supplies requirements for acceptance of Lithium-ion battery systems in battery-powered hybrids or vessels. The setup requirements for Li-ion battery programs such as the applicable IEC 62619 standards and ecological.

We are aware a vacuum drying oven is just a box-type draining apparatus that dries dry stuff under non-positive strain. It employs a vacuum pump to remove moisture from the atmosphere. Therefore, a vacuum cleaner condition is shaped at the chamber, which lessens the drinking water’s boiling point and hastens the drying rate. The industrial vacuum drying oven gets the benefits of quickly drying particular goods, tiny contamination, and no injury for these dehydrated objects’ inherent high quality. However, do you know the vacuum drying ovens ought to be summoned before it’s properly used?

Even as we realized, vacuum drying is commonly utilized in food, medicine, the lighting industry, chemical business, and other sectors such as low-temperature drying. It’s the benefits of quick-drying, external contamination, and no injury to this dehydrated stuff’s inherent high quality. To boost consumers’ efficacy utilizing the vacuum drying chamber’s effectiveness, the customer service team will accumulate buyer response surveys each year. Depending on consumer responses, we’ve outlined several shared flaws and alternatives to users.

The Proper Way to Use an Industrial Vacuum Drying Oven

The evaluation product is placed in a vacuum drying oven to evacuate to clear away the gasoline out of this cloth. In case the workpiece is warmed, the gas will grow if warmed. Since these ovens’ vibrations are quite subtle, the massive pressure made with the enlarging gas can bring about the monitoring window’s tempered-glass exploding. It’s too hazardous. We can prevent this threat when we do vacuum at the beginning and then apply heat.

If heating initially, after which disconnect the heat. Then heat is going to be brought fully to the vacuum pump when the atmosphere is discharged. It’ll create the vacuum’s warmth to grow excessively much and impact the efficacy of the vacuum pump.

The heated fuel will be led to some vacuum pressure gauge that can generate a temperature increase. In case the temperature increase exceeds the chosen working temperature reach of the vacuum pressure gauge, it can create the exhibit mistake of this vacuum strain gauge.

In summary, the proper system of usage would be to liquefy first, after which heating. In case the vacuum falls later, hitting the graded temperature, then grate for a little while back. This may help expand the lifespan of this vacuum drying oven.

Common Problems We Face When Use Vacuum Drying Oven

An industrial vacuum drying oven performs the drying process under a vacuum environment. In a vacuum, then convective heat transport is badly diminished. Heat transport is primarily due to heat conduction and heat scattered from the box and coil walls. As a result of very minimal temperatures, the ratio of radiation heating conduction isn’t significant. The ratio of heat conduction is comparatively huge; however, this material’s outer plane and the coil tubing or perhaps even the outside region is tiny, leading to an exact lousy thermal conduction influence.

The other motive is because the substance dries, then the surface melts and melts to produce a thermal resistance coating. It lessens the heat move of this coil and also the material spiral. The grounded plane over the outside layer is compacted. Therefore your vapor generated indoors may be readily discharged, and which also impacts the drying rate. Additionally, the moment the strain of this bubble is so immense, the spontaneous soil coating is shaped. The substance can probably fall, leading to waste.

Troubleshoot Industrial Vacuum Drying Oven: Issues and Their Solutions

Issue: That is no method to wash out the sample as soon as the vacuum drying oven is functioning.
Cause: This might be a result of the inappropriate oven. The vacuum drying process has to be executed in a closed atmosphere. In case the drinking water vapor is made throughout the drying approach and isn’t discharged punctually, this may create the drinking water vapor to go into the sample.
Solution: Insert some air into the internal space each once every so often, then use the vacuum to extract the drinking water vapor. Therefore the functioning may stop the occurrence that there’s no means to dry out the sample.

Issue: After the industrial vacuum drying oven is faced vacuum suction occurrence.
Cause: Erroneous performance when turning the vacuum pump, then the proper method will always be too near the valve initially and turn off the hose pump. In case the arrangement is reversed, underneath the affect of the unwanted vacuum pressure, then the oil or water from this vacuum pump will be squeezed straight back again.
Solution: Practice the proper succession of surgeries, switch off the valve, and then turn off the hose. When it isn’t hard to produce mistakes, then a check valve should be inserted between your vacuum pump and the vacuum drying oven. After the vacuum pump ceases, the valve will shut the valve immediately. Also, there is not going to be any vacuum.

Issue: The air leakage occurrence that happens following the vacuum drying oven can be employed for a few years.
Cause: The most important reason is most likely not the drying oven is damaged up. However, the seal has been aging and damaged.
Solution: Substitute for the sealing strip punctually. In case the situation still can’t be solved, then this means that the valve has not been damaged. Replace a few valves.

Issue: Quite a gap involving your established temperature and also the actual temperature from the vacuum drying oven.
Cause: Also frequently open and shut the doorway or even the warmth detector is ruined.
Solution: Attempt to decrease the range of shutting and opening your entranceway to replace the temperature detector.

Conclusion

Industrial vacuum drying ovens certainly are a terrific remedy since they create the best usage for their own performance. These assist in lowering your current costs while improving turnaround and quality time at once. The drying oven, which abides by lean producing principles, possesses an immense effect on the operation of almost just about any center. That said, you want to come across a dependable manufacturer that could think of the very optimal/optimally style and style for the particular instance.