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Small burrs cause new energy vehicles to catch fire? Olympus microscope is comparable to "prick" expert lithium battery business circle 5 days ago
Release time:
2021-08-03 09:35
Source:
Power Battery
According to statistics, in the first half of 2020 alone, there have been more than 20 cases of electric vehicles catching fire in China, involving multiple brands.
Electric vehicles , or new energy vehicles, have become the most important part of the current automotive market, and the consideration and testing of their safety issues has always been the focus of attention in the industry. In the second half of 2020, the state issued "Notice on Carrying out Safety Hazard Investigation of New Energy Vehicles" to strictly control the safety of new energy vehicles.
Lithium-ion power battery is the most common battery module component of electric vehicles, and the safety inspection of the battery has become an indispensable part of the safety inspection of electric vehicles.
The common electric vehicle lithium battery is mainly composed of lithium iron phosphate, lithium manganate and ternary lithium batteries. Like our common batteries, lithium batteries are also divided into positive and negative poles, of which all lithium ions All are stored in the positive electrode, and the negative electrode is composed of graphite (carbon). Between the positive and negative poles, the electrolyte and the diaphragm are included. The discharge process of lithium batteries is the movement of lithium ions from the negative electrode to the positive electrode, and the discharge of lithium batteries provides the electrical energy required for the operation of various devices. The safety performance of
battery cell has a great influence on the whole power battery system. If the battery cell is short-circuited, it will cause safety accidents such as spontaneous combustion and explosion, and the product manufacturing process will also affect the performance of the product. What specific reasons will have a great impact on the performance and safety of lithium batteries?
How to ensure the safety of batteries?
In order to ensure the safety of batteries, the batteries can be detected through the following three dimensions. The whole process can be summarized as follows:
1. The burr of the electrode should be monitored during the production process.
(If the electrode burr is too long, it will pierce the diaphragm and cause a short circuit, so it is necessary to monitor and measure the burr. The quality of the diaphragm itself has a great influence on the performance of the battery, so it is necessary to check the quality of the diaphragm, such as whether the surface is scratched or other defects.)
2. Microscopic measurement of electrode layer thickness is required after electrode coating and slitting.
3. The battery shell and electrode plate need to do cleanliness detection, in order to prevent metal particles.
For the inspection of electrode pole piece burr , we can actually use an optical microscope. We can use Olympus DSX1000 optical digital microscope to observe burrs from multiple angles to prevent the omission of burrs in defect inspection, and can measure the size of burrs.
For the inspection of electrode thickness , we can use the three-dimensional scanning and measurement functions of Olympus DSX1000 optical digital microscope, which can measure the cross section of the electrode sheet and the thickness of each layer, as well as the angle of the surface.
For the cleanliness detection of battery case and electrode sheet, we can use Olympus cleaning CIX100 cleanliness microscope to detect the cleanliness of lithium battery case and lithium battery electrode sheet in real time, ensure the accuracy and repeatability of detection under the condition of high automation detection, scan the entire filter membrane within 3 minutes, and automatically generate a report.
The product
Olympus DSX1000 Optical Digital Microscope is used for testing and has a variety of solutions from macro to micro.
. Multiple objective
. Free angle observation
. Observation magnification: 20x ~ 7000x
. Objective and observation method instantaneous switching
. Telecentric optical system
. Double guarantee of accuracy and repeatability
Olympus CIX100 cleanliness microscope , composed of high-level optical technology, highly sensitive color camera and concise intelligent software, provides stable operation results.
. Easy to understand workflow
. No skills and experience required to operate the controls
. High-speed scanning
. NG/OK Early prediction.
. Supports all automotive industry standards
. Support for multiple international cleanliness standards
More information
HMM Participate in The Smart Energy Week Battery Show Japan 2025
Exhibition： The Smart Energy Week Battery Show Japan 2025 Date： Feb.19~21，2025 Venue：Tokyo Big Sight East & South Halls Booth : E45-18
Which brand of Japanese Ni-MH battery is more stable and durable?
Under normal use of nickel-metal hydride batteries, generally speaking, the discharge time of power batteries with high capacity is long, and the discharge time of small capacity is short. However, there are two kinds of performance: stability and durability in the use effect. They become an important reference factor for positioning Ni-MH batteries, because if the stability and durability are insufficient, after encountering some abnormal use, Ni-MH batteries that show the battery life according to their capacity may have some variables, and even the high capacity is not durable due to insufficient stability. After testing five mainstream Japanese nickel-metal hydride battery brands, a Japanese media believes that Sanyo products are the most stable and durable.
Summary of Lithium-ion Battery Safety Test Items and Methods
Lithium-ion batteries and monolithic samples consisting of non-user replaceable batteries/lithium-ion batteries and their electronics. For non-user replaceable batteries, they should be installed in electronic products as a whole sample for the environmental safety test of lithium ion batteries in the standard. For non-user replaceable lithium ion batteries, they can be placed in electronic products as a whole sample, or the lithium ion battery can be taken out separately for the environmental safety test of lithium ion batteries in the standard. It is recommended to test as a whole sample first. As the test process may be deflated, smoke, fire or even explosion, it is necessary to take the necessary protective measures
Main battery type recycling methods and their recycling purposes
Different types of lithium batteries are widely used in different occasions, more scientific and economical recycling of waste batteries for reuse is a cause conducive to nature and human health. After hundreds of years of development, the basic recycling methods for major battery brands are the same in countries around the world. 1. dry batteries: alkaline manganese dry batteries and zinc manganese dry batteries, that is, generally referred to as carbon batteries and alkaline batteries. This type of battery is currently required to ban the use of mercury, so it is safe in life. For this reason, there is no requirement to recycle such batteries. Of course, those who are willing to recycle can engage in this aspect of business, and users do not have any in the garbage can.
Explosion-proof measures for battery and lithium battery
The safety of lithium-ion batteries has always been an important issue that plagues the industrialization of lithium batteries. The battery explosion accidents exposed in recent years are all caused by the use of lithium batteries. Compared with other types of batteries, this is determined by the special nature of lithium battery materials and processes. To this end, we should understand the knowledge of lithium battery explosion, we try to explain from the following three aspects. 1., the national standard stipulates that any part of the solid material within the battery is instantly discharged, and the distance that is pushed to the lithium battery above 25cm is called an explosion. The identification method in the experiment is: cover the experimental battery with a circular mesh so that the battery is located at the center of the circle, I .e. 25cm from any side of the mesh cover. If no solid part of the experiment passes through the mesh cover, it is proved that the battery has not exploded. Here, the "net" has a specific to show: the net wire adopts a soft aluminum wire with a diameter of 0.25mm, and the density of the net is 6~7/cm. 2. how to prevent lithium battery explosion All lithium battery explosions are caused by short circuit caused by battery heating, and the cause of short circuit and over charge, over discharge, positive and negative direct docking, electrolyte leakage and so on. Therefore, in the design of lithium batteries, the following points can be started: 1. It is forbidden to overcharge the battery to more than 4.2V; 2. It is forbidden to overcharge the battery to less than 2.75V; 3. An explosion-proof valve is installed on the metal shell; 4. Prevent short circuit in the process. The best way, of course, is to have a battery protection circuit board design. Although this will increase the manufacturing cost of lithium batteries, it is necessary for the safe use of lithium batteries. All regular lithium battery manufacturers can not avoid this design. 3. polymer lithium battery is the use of flexible packaging and polymer electrolyte made of a lithium battery products, under normal circumstances, the use of storage will not explode, unless man-made strong damage caused by its short circuit. In order to reduce the occurrence of explosion accidents, polymer lithium batteries are being used in more and more occasions. Although lithium batteries are still in the process of replacing other types of batteries, polymer lithium batteries have begun to replace ordinary lithium batteries in some areas.
Lithium Battery Market Analysis in 2020
The lithium battery industry market analysis report is an analysis of the lithium battery industry market size, market competition, regional market, market trends and the scope of attraction. It refers to the lithium battery industry market research and supply and demand forecasts, according to the market environment, competitiveness and competitors of the lithium battery industry products, analysis and judgment of the lithium battery industry products in a limited time whether there is a market, and what kind of marketing strategy to achieve sales goals or what kind of investment strategy to enter the lithium battery market. The main analysis points of the lithium battery market analysis report include: 1) lithium battery industry market supply analysis and market.
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