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13
2023-03
How to improve the low temperature performance of lithium batteries
The low-temperature performance of lithium battery is one of the key factors that restrict the widespread use of lithium batteries. How to improve the low-temperature performance of lithium batteries is still a hot and difficult point of current research. The battery system reaction process mainly includes four steps: Li+ transport in the electrolyte, crossing the electrolyte/electrode interface membrane, charge transfer, and Li+ diffusion in the active material body. At low temperatures, the rate of each step decreases, which causes the impedance of each step to increase, which leads to aggravation of electrode polarization, and causes problems such as a decrease in low- temperature discharge capacity and lithium precipitation in the negative electrode. The poor low-temperature performance of lithium-ion batteries is mainly due to the following three factors: At low temperatures, the viscosity of the electrolyte increases, and the conductivity decreases; The electrolyte/electrode interface membrane impedance and charge transfer impedance increase; The migration rate of lithium ions in the active material body is reduced. As a result, the electrode polarization is increased at low temperatures and the charge and discharge capacity is reduced. The mainstream ways to improve the ion diffusion performance of cathode materials at low temperatures are as follows: Use materials with excellent conductivity to coat the active material body to improve the conductivity of the cathode material interface, reduce the interface impedance, and reduce the positive electrode material and the side reaction of the electrolyte stabilizes the material structure. The second is to do bulk-doping of the material body with Mn, Al, Cr, Mg, F and other elements to increase the layer spacing of the material to increase the diffusion rate of Li+ in the body, reduce the diffusion resistance of Li+, and increase the low temperature of the battery. performance. The third is to reduce the particle size of the material and shorten the Li+ migration path. It should be pointed out that this method will increase the specific surface area of the material and increase the side reaction with the electrolyte.
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28
2022-10
Here's what you need to know about starting the battery
What is a starting battery The battery according to the purpose of classification, can be divided into starting battery, power battery and energy storage battery, power battery is common in E-bike, electric vehicle, electric boat, mainly to provide power for these tools; Starting batteries are used in oil-powered vehicles, such as cars, tractors, and motorcycles, to use high power to ignite internal combustion engines. The starting battery is different from the power battery The starting battery is applied to the starting of the vehicle, the discharge ability is strong, a short time can release more than 10C current, this characteristic determines its volume and capacity is lower than the power battery. The power battery mainly provides power for the vehicle, the maximum discharge current is not more than 1C, and can not be maintained for a long time, often at less than 0.5C power operation, and the battery life is long, because it needs to store more electricity, so the volume and capacity should be larger. The material of the starting battery At present, most of the starting batteries are lead-acid batteries, which is also a relatively large application field of lead-acid batteries. However, due to the gradual attention of environmental protection in various countries, the market for lead-acid starter batteries is gradually compressed, so it is feasible to use lithium iron phosphate batteries as starter batteries. By analyzing the various requirements for starting the battery, it is easy to draw conclusions. The use of lithium iron phosphate is feasible as long as it can meet the characteristics of small size, high discharge rate, and resistance to low and high temperatures. Compared with lead-acid batteries, using lithium iron phosphate starting batteries has the following advantages: However, the application of lithium iron phosphate starter battery in the market is limited at present, which may be related to the high initial investment cost of lithium iron phosphate battery. Another important reason is that users have been used to lead-acid battery, have not tried lithium iron phosphate starter battery, and cannot intuitively feel the advantages of lithium iron phosphate battery.
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26
2022-08
California Bans Sales of New Gas-powered Cars by 2035. Now the Real Work Begins
Buy a car in 2035 and you won’t have to decide between gasoline, diesel or electric. You won’t have a choice. Citing an urgent need to address climate change while cutting back on air pollution, the California Air Resources Board voted Thursday to require all new cars and light trucks sold by 2035 to be zero-emission vehicles. Lauren Sanchez, Gov. Gavin Newsom’s climate advisor, called it “a huge day not only for California but the entire world.” The mission, she said: “Move the state away from oil.” The move marks a historic turn in the decades-long battle to curb motor vehicle pollution, a momentous shift for consumers, industry, the economy and the environment. California has led the nation in auto emissions regulation since the air resources board was created in 1967 to combat the toxic yellow-brown smog that hung over Los Angeles. The state's large population meant automakers could not ignore California's mandates. Congress gave California permission to set its own rules under the Federal Air Quality Act the same year. California's emissions and fuel efficiency rules have been adopted by more than a dozen other states. Even with that prodigious record, the zero-emission mandate "is the most important and transformative action that [the air resources board] has ever taken," said Dan Sperling, founding director of the Institute of Transportation Studies at UC Davis. The mandate forces automakers to phase out gasoline and diesel cars, sport utility vehicles, minivans and pickup trucks in favor of cleaner versions powered by batteries or fuel cells. If automakers fall short, they could be charged $20,000 per noncomplying car, the air resources board said. If consumers don’t go along? That could cause big problems. But state officials think they will, and the trend line lends confidence. Electric cars are rapidly gaining popularity in California. In 2012, less than 2% of new vehicles sold were electric. That grew to 7% in 2018. But demand has surged since, and now 16% of new cars sold in the state are plug-in vehicles — battery electric, led by Tesla; plug-in hybrid vehicles; and a smattering of cars that run on hydrogen fuel cells. There are now 1.13 million zero-emission vehicles registered in California, according to the air resources board — 43% of the nation’s total. Once considered little more than glorified golf carts with paltry range, electric cars now can travel several hundred miles on a single charge, in models that range from small commuter cars to luxury vehicles to SUVs, pickup trucks and muscle cars. Under the new rules, 35% of new cars must be zero emission by 2026, 68% by 2030, and 100% by 2035. People could still buy internal combustion cars from another state. But many states, including most of its neighbors, tend to follow California’s lead on vehicle emissions policy and are considering mandates of their own. The effects of the 2035 mandate will be far-reaching, the air resources board said. It “will essentially end vehicle emissions altogether,” CARB board Chair Liane Randolph told reporters. Not quite. As Randolph herself noted, owners of internal combustion cars can continue to drive them after 2035. It will still be legal to buy and sell used fossil-fuel cars and light trucks. The mandate doesn’t cover all of highway transportation, either. Heavy trucks that burn diesel fuel will have 10 extra years before they’re banned. A proposed zero-emission mandate for heavy trucks wouldn’t hit 100% until 2045. And even the zero-emission vehicle mandate includes vehicles that are not zero-emission. Up to 20% of a carmaker's sales can be plug-in hybrids, which have both electric motors and gas engines, and still count as zero-emission vehicles, as long as the minimum battery range is 50 miles or more. The state uses “zero-emission” as shorthand, pertaining to the cars themselves as they move along the roadways. Recharging the batteries may well emit significant greenhouse gases, depending on what’s generating the energy: coal, oil and natural gas on the dirtier side; solar, wind, hydropower and nuclear on the cleaner. Creating hydrogen from water for fuel cells requires significant electricity, so greenhouse gas emissions again depend on the source. https://www.aol.com/news/california-bans-sales-gas-powered-204550623.html
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28
2022-07
Tesla catches fire and spontaneous combustion, The safety of ternary battery needs to be improved
On July 22,a Tesla Model X crashed into a telephone pole in Taiwan and caught fire.Fortunately,no one was injured. Pictures from the scene showed that the front half of the vehicle had been completely damaged,apparently by a burning battery pack.The battery pack combustion can be divided into short circuit,charge and discharge overload and high temperature.Combining with the field conditions,it can be judged that the battery pack overfire is caused by short circuit caused by impact. In the acupuncture experiment,the NCM battery caught fire,while the LFP battery only smoked after acupuncture. This is because lithium iron phosphate is more resistant to high temperature than teradic lithium.The thermal runaway of lithium iron phosphate is about 800℃,while the thermal runaway of teradic lithium only needs 200℃. The NMC battery in the accident was the main cause of the fire after the accident.
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28
2022-06
High rate battery
What is a high rate battery Before understanding the high-rate cells, we must first understand the high-rate. Compared with the ordinary rate, the high-rate represents the charging and discharging capacity of the lithium battery. The high-rate battery is divided into discharge rate and charging rate. The rate, "C" is used to represent the ratio of the size of the battery charge and discharge current, that is, the rate. Such as 280Ah battery, 0.5C means 140A, 1C means 280A, the same. The difference from ordinary batteries Compared with ordinary batteries, the biggest feature of high-rate batteries is that the charging speed is faster. If ordinary batteries are fast charged, it is easy to cause lithium deposition in the negative electrode, resulting in accelerated battery performance degradation. In severe cases, it can cause an internal short circuit in the battery, resulting in a fire and explosion. . It only takes 25 minutes for a high-rate battery to be fully charged at 3C, and it takes more than 80 minutes to charge an ordinary battery at 1C. As shown in the figure below, the charging time can be saved by more than 60%. Precautions for high rate cells Generally, a new high-rate battery needs to be activated. After the battery is placed for a period of time, it will enter a dormant state. At this time, the capacity is lower than the normal value, and the use time is also shortened, so it needs to be activated. The activation method of lithium battery is very simple, as long as 3 to 5 normal charge-discharge cycles can be used to activate the battery and restore its normal capacity. High-rate batteries that will not be used for a long time should be stored in a cool and dry place in a half-charged state. It is dangerous to store the battery fully charged, and the battery may be damaged and rendered useless when stored without it. During the storage process, every 3 to 6 months, a charging cycle should be completed and a power calibration should be done. Finally, let's introduce our high-rate cells: Capacity: 25~100Ah; Charging rate: 2~3C; Discharge rate: 3~6C; Strong low-temperature discharge capability, supporting discharge at temperatures as low as -30°C; It can be applied to high power density applications such as engine starting, mining machinery, heavy vehicles, electric locomotives, charging stations, UPS, and energy storage.
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24
2022-05
Truck Air Conditioning Power Brings Summer Coolness
Working conditions for outdoor truck drivers are getting worse as hot weather approaches. How to stop for a long time and wait for the driver to need air conditioning work? ·Always keep the engine running?No!Emitting too many pollutants,which is not allowed in some countries; ·What about starting battery power? No, it provides only a limited amount of power,and running out of power without being able to start the engine is a major headache for the driver How to do?Fortunately,after some engineering research and discussion,we were able to attach an additional lithium iron phosphate power supply to the truck's air conditioning system. Compared with the original lead-acid power supply,our lithium iron phosphate power supply has a longer life and better safety.It can discharge continuously under the condition of-20~50℃and support the continuous operation of air conditioning for no less than 6 hours. What's important is that it's easy to use,like a lead-acid battery,by simply connecting the battery to it and recharging it with the engine when it's low on power.In use,we provide two practical solutions,one is to connect the original lead acid power supply in parallel(because the voltage of the two independent power supply is the same),which can increase the capacity of the power supply system;The other is to replace lead-acid batteries directly,which is safer. If you need batteries,please feel free to contact us.
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14
2022-03
What is the Third Power of New Energy Vehicles
The big three in new energy vehicles includes drive motor, EV battery and electronic control system(VCU).The control system is shown in the following figure: Drive Motor The drive motor is the main executive body of the vehicle,and its characteristics determine the main performance index of the vehicle,which directly affects the power,economy and comfort of the vehicle.The drive motor of new energy vehicles is generally a three-phase AC synchronous motor. Power Battery The power battery is a chemical power source that provides electrical energy to the high-voltage power circuit.It is generally composed of many single cells in parallel and then in series,and is controlled by the battery management system BMS to ensure the safety and stability of the power battery.The current application The most widely used are lithium iron phosphate batteries and ternary lithium batteries. Electronic Control System The electronic control system is the core system of the new energy vehicle.It is responsible for receiving various operating instructions from the driver during the driving process of the vehicle,diagnosing and analyzing the status of the vehicle and its components,making comprehensive judgments,and sending control instructions to the controller of each component to make The whole vehicle drives safely according to the driver's intention. In daily life,the most frequent contact with us is the power battery.We charge and discharge the car every day,but who would have thought that the power battery is composed of standard cells. The quality of the power battery is directly related to the owner's experience.After all,in the process of driving,if there is a problem with the battery,no one will not explode.At present,the batteries sold by our company have TUV,UL,UN38.3,MSDS,CCS certification,which have great advantages in terms of safety and charging and discharging performance. And for small retailers,we are more willing to customize modules or battery packs to better satisfy consumers'shopping experience.
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13
2024-08
Happy Ending : Annual Meeting
On January 25, 2021, the last working day of this year, our company held a new year meeting in the conference room of YanHuang Science and Technology Park. At the annual meeting, we start with joy and end with joy. First of all, we played a game——the wealth is rolling, which symbolizes the wealth of the new year. By rolling the cans to determine the ownership of the red envelopes, if a person is lucky enough, he can get two red envelopes at one time. It's a bug, but we're not tired of it. Then we reviewed the experience in 2021 with a video. We hurriedly immersed ourselves in work every day, but there are more than work in our life. Going out for mountain climbing, employee birthdays, and going out to dinner also add color to life, like ripples on a calm lake. Gives a bit of vitality. After that, there is a more formal part - work report. Why do I use this statement? It is because the people on stage are nervously reporting, and the audience below the stage is listening to the report and eating snacks. Maybe no one can Resist the temptation to snack. The overall market environment in 2021 is not good, and the new crown epidemic, monetary easing, and energy crisis have brought great challenges to the market. There is a saying in China that confidence is more important than gold. We believe that there will be great opportunities in the new energy industry in the future, and we are ready to embrace the sea of stars. In addition, we presented various awards to our employees, as well as cash and tablet computers to express our recognition of their work performance. Finally, the company prepared New Year red envelopes for all employees to add joy to the New Year. Finally, I wish you in front of the screen: Happy New Year!
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13
2024-08
Lithium Batteries in the Industrial Market
During the workshop,problems were examined that are related to the use of traditional lead-acid batteries,a source of dissatisfaction for many users.These problems include long charging times(8-10 hours to completely charge)and the inability to use the batteries when only partially charged.Another critical issue is high maintenance costs. Over the life of a lead-acid battery,maintenance costs may actually exceed the cost of the battery itself.They include: ·the cost of topping up the water ·the cost of removing acid and oxide built-up ·the cost of water demineralisation systems ·the cost of ventilation systems in the charging area ·the cost of the space necessary for the charging area These costs are not often taken into consideration,thus making lead-acid technology appear cheaper. Actually,if all these factors are considered,lithium on balance is economically favourable,besides offering major benefits in terms of performance and production efficiency. We Be Power Co.,LTD are focusing on manufacture batteries with outstanding characteristics: -Past very strict safety testing,such as Nail penetration,shooting test,etc.We have got the most strict certification”Mining products safety certification”,and available for underground working environment with gas. -ultra high discharge current rate:Continuous discharging current up to 10C. -High charge current rate:Continuous charging current up to 3C. -Discharge on very low temperature until-40℃. -Long cycle life up to 6000 cycles. More details please visit website: www.bepower.com.cnOr write to us: info@bepower.com.cn
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13
2024-08
Why Change From a Lead-acid Battery to a Lithium Battery?
WHY CHANGE FROM A LEAD-ACID BATTERY TO A LITHIUM BATTERY?This question is certainly the most frequently asked and is the first of a long list. I suggest we just examine the solution straight away.CHARGING THE BATTERYLead Acid battery: The charging efficiency of this type of battery is low – only 75%! A lead-acid battery needs more energy for recharging than it delivers. The excess energy is used for gasification and for mixing the acid internally. This process warms up the battery and evaporates the water inside, which results in the need to top up the battery with distilled (demineralised) water.Lead-acid recharging has severe limitations and a number of critical points. Here are the most important ones:× Fast or partial charges ruin a lead-acid battery× Charging times are long: from 6 to 8 hours× The charger does not collect full information on the battery. It only checks the voltage, and that’s not enough. Changes in temperature affect the recharge profile, so if the temperature is not measured, the battery will never charge completely in winter and will gasify too much in summer× An incorrect charger or setting reduces battery life× Poor maintenance will also reduce battery lifeLithium ion battery: Lithium-ion batteries can be “fast” charged to 100% of capacity.A lithium battery saves on your electric bill, as it is up to 96% efficient and accepts both partial and rapid charging.A lithium battery can be charged to 50% capacity in only 25 minutes.This innovative characteristic enables our customers to equip their devices with lower installed battery capacity than the capacity required with lead-acid batteries, because lithium batteries can be recharged repeatedly over a short timeElectronic systems inside the battery control the charger effectively, so it can deliver the exact current that is consistent with internal parameters (voltage, temperature, charge level, etc …). If a customer connects an unsuitable battery charger, the battery will not activate and is thus fully protected.ChargingüA lithium battery saves on electricity bill with efficiency up to 96%.üA lithium battery accepts partial charge and fast charge.üIn 25 minutes we can charge 50% of the battery.Lithium-Ion batteries are fairly maintenance free and doesn’t produce gas.This eliminates any additional costs.It works just fine.WEIGHT OF BATTERYLead Acid battery: 30Kg for kWhLithium ion battery: 6Kg for kWhOn average Lithium-Ion batteries weight 5 times less than standard lead acid battery.MAINTENANCELead acid battery: high maintenance and systems costs. Ordinary maintenance is one of the greatest costs, as it includes topping up the water, maintaining the filling system, and removing oxide from the elements and terminals.It would be a serious mistake not to take into consideration 3 other, hidden costs:＄ Infrastructure cost: lead-acid batteries release gas while they are charging and must therefore be charged in a dedicated area. What is the cost of this space, which could be used for other purposes?＄ Cost of gas disposal: the gas released by lead-acid batteries must not remain inside the charging area. It must be removed to the outside by special ventilation systems.＄ Cost of water demineralisation: in smaller companies, this cost can be included in ordinary maintenance, but becomes a separate expense for medium to large companies. Demineralisation is a necessary treatment for water used to top-up lead-acid batteries.Lithium ion battery: no infrastructure cost, no gas and no need for water, which eliminates all additional costs. The battery just works.SERVICE LIFELithium-ion batteries last 3-4 times longer than lead-acid batteries, without losing effectiveness over time.LITHIUM BATTERY100%LEAD ACID BATTERY25%SAFETY, WATERPROOFING AND EMISSIONSLead acid batteries have no safety devices, are not sealed, and release hydrogen during charging. In fact, their use in the food industry is not permitted (except for “gel” versions, which are even less efficient).Lithium batteries release no emissions, are suitable for all applications (also available in IP67) and feature 3 different control systems that protect the battery:ØAutomatic disconnection, which disconnects the battery when the machine/vehicle is idle and protects the battery from improper use by the customerØBalancing and management system which maximizes battery efficiencyØRemote control system with automatic warning of troubles and malfunctionsBALANCING WITH SAFETY, POWER DENSITY AND COST, LFP BATTERY IS THE BEST ONE!We Be Power Co.,LTD are focusing on manufacture batteries with outstanding characteristics:lPast very strict safety testing, such as Nail penetration, shooting test, etc. We have got the most strict certification ”Mining products safety certification”, and available for underground working environment with gas.lUltra high discharge current rate: Continuous discharging current up to 10C.lHigh charge current rate: Continuous charging current up to 3C. lDischarge on very low temperature until -40℃. lLong cycle life up to 6000 cycles. More details please visit website: www.bepower.com.cnOr write to us: info@bepower.com.cn
