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Analysis of the current situation, difficulties and solutions of electric vehicle batteries

Posted by: Yoyokuo 2022-09-26 Comments Off on Analysis of the current situation, difficulties and solutions of electric vehicle batteries

Electric vehicle batteries are the power source of electric vehicles. Most of the current electric vehicles are equipped with lead-acid batteries. Lead-acid batteries have low cost and high cost performance. Because this kind of battery can be charged and can be used repeatedly, it is called “lead-acid battery”.

Electric vehicle batteries are the power source of electric vehicles. Most of the current electric vehicles are equipped with lead-acid batteries. Lead-acid batteries have low cost and high cost performance. Because this kind of battery can be charged and can be used repeatedly, it is called “lead-acid battery”.

In 1860, France’s Plantite invented a battery with lead electrodes, which is the predecessor of lead-acid batteries.

structure

Lithium battery conductive coating

Conductive coating is also called pre-coating. In the lithium battery industry, it usually refers to a layer of conductive coating applied to the surface of the positive electrode current collector, the aluminum foil. The aluminum foil coated with the conductive coating is called pre-coated aluminum foil or simply coated. Layered aluminum foil, its earliest experiments in batteries can be traced back to the 1970s. In recent years, with the development of new energy industry, especially lithium iron phosphate batteries, it has become a hot new technology or new material in the industry.

Lithium battery conductive coating performance

The conductive coating can effectively improve the adhesion of the pole piece in the lithium battery, reduce the amount of binder used, and also significantly improve the electrical performance of the battery. The products of large foreign companies will not be introduced. Let me introduce the only domestic product that is promoted in the market and has independent intellectual property rights – WX112, which is developed and produced by Shanghai Zhongxing Pine Energy Technology Co., Ltd. under Zhongxingxin. According to the samples received, technical requirements such as full coating, margins, and gaps can be achieved. The performance is as follows:

1. 40% drop in contact resistance

2. Adhesive usage reduced by 50%

3. Under the same magnification, the battery voltage platform is increased by 20%

4.The adhesion between the material and the current collector is improved by 30%, and there will be no delamination after long-term cycling

Instructions for use of carbon-coated aluminum foil

1. Material description

Carbon-coated aluminum foil is made of conductive carbon-based composite slurry and high-purity Electronic aluminum foil by transfer coating process.

2. Scope of application

Power lithium battery with fine particle active material

The positive electrode is lithium iron phosphate

The positive electrode is ternary/lithium manganate with fine particles

Used for supercapacitors, lithium primary batteries (lithium sub, lithium manganese, lithium iron, button, etc.) to replace etched aluminum foil

3. Effect on battery/capacitor performance

Suppress battery polarization, reduce thermal effects, and improve rate performance;

Reduce the internal resistance of the battery, and significantly reduce the dynamic internal resistance increase in the cycle process;

Improve consistency and increase battery cycle life;

Improve the adhesion between the active material and the current collector, and reduce the manufacturing cost of the pole piece;

Protect the current collector from being corroded by the electrolyte;

Improve the high and low temperature performance of lithium iron phosphate batteries, and improve the processing performance of lithium iron phosphate and lithium titanate materials.

4. Recommended parameters

The D50 of the active material to be coated is preferably not greater than 4-5 μm, the compaction density is not greater than 2.25 g/cm, and the specific surface area is within the range of 13-18 O/g.

5. Precautions in use

1. Storage requirements: In an environment with a temperature of 25±5℃ and a humidity of not more than 50%, the corrosion of the aluminum foil by air and water vapor must be avoided during transportation;

2. This product is divided into two types, A and B. The key features of each are: Type A is black in appearance, with a conventional coating thickness of 4-8μm on both sides, with more prominent electrical conductivity; Type B is light gray in appearance, with conventional coating The thickness is 2-3 μm on both sides, less layers of welding can be done in the coating area, and the coating machine can recognize the jump gap;

3. Type B (gray) carbon-coated aluminum foil can be directly ultrasonic welded in the coating area, and is only suitable for winding battery welding tabs (maximum 2-3 layers of pole pieces), but the power and time of ultrasonic need to be fine-tuned;

4. The heat dissipation of the carbon layer is worse than that of the aluminum foil, so it is necessary to fine-tune the belt speed and baking temperature when coating;

5. This product has a considerable improvement in the comprehensive performance of lithium batteries and capacitors, but it cannot be used as the main factor to change the performance of certain aspects of the battery, such as battery energy density, high and low temperature performance, high voltage and so on.

Assembly equipment

battery casting

Casting welding machine, also known as automatic battery casting welding machine. It is a small valve-regulated sealed lead-acid battery casting and welding equipment. The whole set of equipment includes a fixture, a mold, a furnace, a cooling device, and a mold release device into the pool shell. The fixture is composed of a fixed plate and a slidable pressing plate on the bottom plate, and the fixed plate is provided with a positioning pin; the surface of the casting and welding mold is provided with a busbar and a pole-shaped groove, and a positioning hole; demoulding The device for entering the pool shell includes a pneumatic demoulding device and a pneumatic device for entering the pool shell. The casting and welding equipment of the utility model solves the disadvantages of low production efficiency and poor welding quality of manual welding in battery production, and greatly reduces the contact between people and lead. This equipment is simple and practical to operate, suitable for the assembly and production of small and medium-sized VRLA battery factories.

technical parameter

GD-1109-80

GD-1109-80

1. Machine model: GD-1109-80, -120

2. Applicable voltage: AC±5%/50HZ

3. Maximum power: 16KW

4. Applicable power: air compressor

5. Air source pressure: 0.8Mpa6, scope of application: various small dense lead-acid batteries

7. Dimensions: 1200×1400×2200mm

Analysis of the current situation of electric vehicles, difficulties and solutions

With the continuous popularity of electric bicycles, also called electric vehicles, many people with higher commuting requirements have abandoned traditional human-powered bicycles and turned to battery-powered bicycles, which can also be driven manually when the battery is exhausted. This is a human-electric hybrid bicycle. Human-electric hybrid bicycles have been widely used and praised in large and medium cities and even in rural areas.[Including my personal hometown and now Beijing]

However, the development of human-electric hybrid bicycles is not smooth sailing, and there are many bumps and difficulties on the road to growth. In terms of policies[Beijing has considered getting a license for trams, and drivers of trams, laughing]battery charging problems[many families do not have the environment and conditions to charge trams]and cruising range[IoncerodeacarTheproblemthatatramwithoutelectricitytraveled20kilometersanddiedofexhaustionhaslimitedthedevelopmentoftramsbutbecauseofitsgrassrootsandlowcostofusetramshaveoccupiedalargeseatinthemarket

After the success of the tram, it gave birth to electric motorcycles and electric three-wheeled vehicles, which were all the rage. But what about electric cars?

An agricultural vehicle manufacturer in Shandong produced electric vehicles, bypassing some national regulations. The road killers who originally drove gasoline and diesel agricultural three-wheelers were transferred to the electric vehicle front, and the state stopped them in time. Although electric vehicles have made waves in some parts of Shandong, the road ahead is still very difficult:

1. Battery life

An electric car in the United States (forgot the specific brand, introduced by Friends of Cars) has achieved a cruising range of 300km, and is developing towards a stronger cruising range. However, compared with the current ordinary family cars, this endurance is obviously not satisfactory to the riders. In order to solve the problem of battery life, car design manufacturers need to invest more capital and manpower in battery research and development. In addition, assuming that the battery problem has been solved and the battery life is not a short board, how to charge the battery when the battery is exhausted is a problem. Driving from Beijing to Shanghai, you have to refuel the gasoline car halfway through the journey. The tram needs to be recharged. The gasoline car can go in ten minutes at most fifteen minutes. What about the tram? How long does it take to charge to ensure that the electric car can continue to drive all the way to Shanghai? You can’t charge it overnight like an electric bike, right?

Modular batteries may solve this charging problem, but do electric vehicles around the world need to be equipped with a unified modular battery? The answer is yes, the battery specifications cannot exceed the combination of all gasoline and diesel standards at most, otherwise the charging station or the battery life node will be difficult to operate at low cost.

[Modular battery can think about it]

2. Torque

I’m not a professional, but the magazine also said that the torque of the electric car is less than the torque of the gasoline car, which also means that the peak output in terms of power and so on will be smaller. I don’t know much about this piece. I personally think that the output power can be adjusted through the motor itself and the gearbox. I believe this aspect is not the biggest problem.

3. Policy Issues

Whether the national policy adopts support or suppression can completely reverse the whole situation, and the influence of the policy orientation on domestic industry is still quite huge. Coal, steel, automobiles, civil aviation, etc. are all developing in accordance with policies. If you don’t understand policies, don’t talk about industry and commerce. If you don’t understand policies, don’t engage in academia. If you don’t understand policies, it’s hard to survive.

The country calls for a low-carbon economy, but does not act on large-displacement vehicles. The country calls for a low-carbon economy, but it still lacks interest in wind power and nuclear power. If it cannot create a new economic growth point, it is not a good product. On the contrary, it affects the national automobile industry that has just started, and it is even less a good product.

If the national auto industry wants to develop electric vehicles, where is its technological capability? Without scientific and technological research and development capabilities, wouldn’t it become water without a source? Huawei, Huawei is plundering, it is squeezing future wealth, companies without humanistic care are like bacteria injected by stars, is it good-looking? nice. The future is ugly. Stars don’t care about tomorrow, because tomorrow is destined to be bleak, but companies need to care.

But the good news is that the automotive industry has paid attention to this product, and I believe that those elites with high IQs will definitely be able to design a set of solutions beyond reality, and finally, like Microsoft, build an electric vehicle[home, industrial, commuting]To build a green transportation world with no exhaust, no waste oil, and no more carburetor air filters. The premise is that the source of electricity generation is wind energy, nuclear energy, solar energy and waste biogas.

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