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Electric vehicle battery is the power source of electric vehicles. Most electric vehicles are now equipped with lead-acid batteries, which have low cost and high cost performance. Because this kind of battery can be recharged and reused, it is called "lead-acid battery".

In 1860, France's Prante invented the battery with lead as electrode, which is the predecessor of lead-acid battery.

structure

Conductive coating of lithium battery

Conductive coating is also known as precoating. In the lithium battery industry, it usually refers to a layer of conductive coating on the surface of the positive current-collecting aluminum foil. The aluminum foil coated with conductive coating is called precoated aluminum foil or coated aluminum foil for short. Its earliest experiment in the battery can be traced back to the 1970s. In recent years, with the development of the new energy industry, especially lithium iron phosphate battery, it has become a hot new technology or new material in the industry.

Conductive coating performance of lithium battery

Conductive coating in lithium battery can effectively improve the adhesion of the electrode, reduce the amount of adhesive used, and also significantly improve the electrical performance of the battery. The products of large foreign companies will not be introduced. Let's introduce the WX112, which is the only product promoted in the market in China and has independent intellectual property rights. It is developed and produced by Shanghai ZTE Energy Technology Co., Ltd., a subsidiary of ZTE New. From the samples obtained, it can be seen that the technical requirements of full coating, edge and gap can be achieved. The performance is as follows:

1. Contact resistance decreases by 40%

2. Reduce the amount of adhesive by 50%

3. At the same magnification, the battery voltage platform increases by 20%

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

Instructions for use of carbon-coated aluminum foil

1、 Material description

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

2、 Scope of application

Power type lithium battery with fine particle active substance

The cathode is lithium ferrous phosphate

Ternary/lithium manganate with fine particles as cathode

Used for supercapacitors and lithium primary batteries (lithium sulfite, lithium manganese, lithium iron, button type, etc.) instead of etching aluminum foil

3、 Performance effect on battery/capacitor

Suppress the polarization of the battery, reduce the thermal effect, and improve the magnification performance;

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

Improve the consistency and increase the cycle life of the battery;

Improve the adhesion between the active substance and the fluid collector, and reduce the manufacturing cost of the electrode;

Protect the fluid collector from corrosion by electrolyte;

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

4、 Recommended parameters

The active substance D50 corresponding to the coating should preferably not be greater than 4-5 μ m. The compaction density is not more than 2.25g/cm, and the specific surface area is in the range of 13~18 ㎡/g.

5、 Precautions in use

1. Storage requirements: In the environment with temperature of 25 ± 5 ℃ and humidity of no more than 50%, the aluminum foil shall be protected from air and water vapor during transportation;

2. This product is divided into two types, A and B. Their key characteristics are: the appearance of type A is black, and the thickness of conventional coating is 4-8 on both sides μ m. The conductivity is more prominent; The appearance of model B is light gray, and the thickness of conventional coating is 2-3 on both sides μ m. The coating area can be welded with less layers, and the coating machine can identify the skip gap;

3. Type B (gray) carbon-coated aluminum foil can be used for ultrasonic welding directly in the coating area. It is only suitable for welding the lug of coiled battery (2-3 layers at most), but the ultrasonic power and time need to be adjusted slightly;

4. The heat dissipation of carbon layer is worse than that of aluminum foil, so the belt speed and baking temperature should be adjusted slightly when coating;

5. This product can significantly improve the comprehensive performance of lithium battery and capacitor, but it cannot be used as the main factor to change the performance of battery in some aspects, such as battery energy density, high and low temperature performance, high voltage, etc.

Assembly equipment

Battery casting

Casting and welding machine, also known as automatic battery casting and welding machine. It is a small valve-controlled sealed lead-acid battery casting and welding equipment. The whole set of equipment includes fixture, mold, furnace, cooling device, and demoulding device. The clamp is composed of a fixed plate and a sliding pressing plate on the base plate, and the fixed plate is provided with a positioning pin; The surface of the casting and welding die is provided with a bus bar and a groove in the shape of a pole, and is provided with a positioning hole; The demoulding device into the tank shell includes the pneumatic demoulding device and the pneumatic device into the tank 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, and suitable for assembly and production of small and medium-sized valve-regulated sealed lead-acid battery plants of all sizes.

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 and dense lead-acid batteries

7. Overall dimension: 1200 × one thousand and four hundred × 2200mm

Analysis of the current problems and solutions of electric vehicles

With the continuous popularity of electric bicycles, also known as electric bikes, many people with high commuting requirements have abandoned the traditional rickshaws and turned to battery-powered bicycles, which can also be driven manually when the batteries are exhausted. This is a hybrid electric bicycle. Human-electric hybrid bicycles have been widely used and praised in large and medium-sized cities and even in rural areas Including my hometown and now Beijing]

However, the development of hybrid electric bicycle is not smooth, and it has gained a lot of bumps and difficulties in its growth. In terms of policy [Beijing once considered to license electric cars, and drivers of electric cars should license, laugh], battery charging problems [many families do not have the environment and conditions to charge electric cars], and endurance mileage issues [I used to drive a trolley car without electricity for 20 kilometers, tired to death] have all restricted the development of electric cars, but because of its grassroots and low cost of use, Trams occupy a large place in the market.

After the success of trams, electric motorcycles and electric tricycles were born and became popular. But what about electric cars?

An agricultural vehicle manufacturer in Shandong produced electric vehicles, which bypassed some national regulations. The road killer who originally drove a gasoline engine and diesel engine agricultural tricycle shifted to the front line of electric vehicles, and the country stopped in time. Although electric vehicles have made waves in some parts of Shandong Province, the road ahead is still difficult:

1、 Endurance

An electric car in the United States [specific brand forgotten, introduced by Friends of Automobile] has achieved a 300km endurance capability and is developing towards a stronger endurance capability. However, compared with the current ordinary family car, this endurance capability obviously cannot satisfy the car users. In order to solve the problem of battery life, automotive 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 short, how to charge the battery when the battery is used up is a problem. When driving from Beijing to Shanghai, the gasoline car needs to be refueled half the way, and the tram needs to be recharged. The gasoline car can go in ten minutes or fifteen minutes at most. What about the tram? How long will it take to charge to ensure that the electric car can continue to drive and drive to Shanghai? Can't you charge it all night like an electric bicycle?

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

[Think about modular battery]

2、 Torque

I am not a professional, but the magazine also said that the torque of electric vehicles is smaller than that of gasoline vehicles, which also means that the peak output of power and other aspects will be smaller. I don't know much about this. I personally think that the output power can be adjusted by the motor itself and the gearbox. I believe this is not the biggest problem.

3、 Policy issues

Whether the national policy supports or suppresses this can completely reverse the whole situation, and the tendency of the policy has a huge impact on the domestic industry. Coal, steel, automobile, civil aviation and other aspects are developing in accordance with the policy. If you don't understand the policy, don't talk about industry and commerce. If you don't understand the policy, don't engage in academia. If you don't understand the policy, it is difficult to survive.

The country calls for a low-carbon economy, but it has no action 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 can not create a new economic growth point, it is not a good product, but it will affect the national automobile industry that has just started, and it is even worse.

Where is the technological capability of the national automobile industry to develop electric vehicles? Without scientific and technological research and development capabilities, wouldn't it be water without a source? Huawei, Huawei is plundering, it is squeezing future wealth. Enterprises without humanistic care are like bacteria injected by stars. Are they beautiful? good-looking. The future is ugly. Stars don't care about tomorrow, because tomorrow is doomed to be bleak, but enterprises need to care.

However, it is gratifying to note that the automobile industry has attached great importance to this product. I believe that those elites with high intelligence will be able to design a set of solutions that transcend reality. Finally, like Microsoft, we will build a money empire of electric vehicles (household, industrial, commuting, racing, yacht, motorbike), and a green transportation world without exhaust gas, waste oil, and carburetor air filter. The premise is that the sources of electricity generation are wind energy, nuclear energy, solar energy and garbage biogas.

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