Some must-know lipo battery 100c factory auxiliary equipment

This article will introduce the very important auxiliary equipment of lipo battery 100c factory, the manufacturing equipment of lipo battery 100c cell, the power source and operation status of these auxiliary equipment, to a certain extent, determine the modernization and automation level of a lipo battery 100c factory, And it greatly affects the quality of battery manufacturing.
Here CNHL wants to divide them into two main categories, public equipment and logistics equipment. The public equipment CNHL divides it into power equipment and environmental control equipment. Below, CNHL talks about the equipment that keeps the factory running normally.

Lipo battery 100c factory auxiliary equipment: power equipment

Power equipment, I understand it as equipment that can realize energy conversion and provide energy to the main equipment, is divided into power generation equipment (steam boiler, gasoline engine, generator, etc.), power transmission equipment (transformer, switchboard, rectifier, etc.), Power consumption equipment (motors, electric furnaces, electrical appliances, etc.). Below, we briefly introduce the functions of a single device.

1) Boiler

In fact, it is not only a battery factory, but many factories have this equipment. The boiler operates in two parts, the "pot" and the "furnace" at the same time. After the water enters the boiler, the heating surface of the boiler transfers the absorbed heat to the water in the steam-water system, so that the water is heated into a Hot water or generated steam of a certain temperature and pressure is drawn out for application. In the combustion equipment part, the fuel combustion continuously emits heat, and the high-temperature flue gas generated by the combustion transmits the heat to the heating surface of the boiler through the spread of heat, and the temperature itself gradually decreases, and finally is discharged from the chimney.
And our battery company mainly takes its high-temperature steam, and after processing, it is often used in the drying of the coating machine pole piece, the aging room, and the dehumidifier.

2) Air compressor

Compressed air can be produced by an air compressor. The air is compressible. The air after the air compressor does mechanical work to reduce its volume and increase its pressure is called compressed air. Compressed air is an important power source. Compared with other energy sources, it has the following obvious characteristics: clear and transparent, easy to transport, no special harmful properties, no fire danger, not afraid of overload, can work in many unfavorable environments, air is everywhere on the ground, take it Endless.

Compressed air is mentioned here because its use is quite extensive in the current automated workshop. Almost runs through the whole line, especially the logistics line, the equipment for releasing or blocking, with cylinder control, combined with solenoid valve, can efficiently complete the mechanical action, and can also achieve energy saving and environmental protection. Compressed air can be used to control the logistics line pallet elevators in our battery workshop, manipulators grabbing batteries, and material conveying.

3) Vacuum pump

If compressed air is the compression of air, then vacuum is the extraction of air. Here we use a vacuum pump. A vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physical-chemical methods to evacuate the pumped container to obtain a vacuum. In layman's terms, a vacuum pump is a device that uses various methods to improve, generate and maintain vacuum in a closed space.

Many times, our work steps are carried out in a vacuum state, especially in the production workshop of lithium-ion power batteries, the slurry needs to be vacuumized to eliminate the air in the tank, avoid the generation of air bubbles, and affect the coating effect: after laser welding, In order to test the air tightness of the battery, it is also necessary to evacuate, and check the pressure drop after maintaining the pressure to determine whether there is air leakage;

the high temperature tunnel furnace, in order to replace the air inside the battery, make the battery baking effect better, the tunnel furnace Vacuuming will be carried out, which can better dry the moisture in the pole piece; liquid injection, the process of liquid injection is vacuum injection, which can better ensure the quality of liquid injection; negative pressure formation, lipo battery 100c is forming A large amount of gas will be generated during the process, and the battery needs to be evacuated to reduce the possibility of lithium precipitation.

4) Nitrogen generator

Nitrogen generator refers to a device that uses air as raw material and uses physical methods to separate oxygen and nitrogen in it to obtain nitrogen. What we usually need is nitrogen, which is an inert gas and is chemically inactive.
In battery factories, there are many places where nitrogen is needed.

Basically, there are many places where there is a vacuum, and there is a demand for nitrogen. As for the role of nitrogen, I also said when I wrote about laser welding before. During laser welding, it mainly plays a protective role, blocking heat dissipation to a certain extent, welding slag splashing, and neutralizing some ions; it is used in vacuum high-temperature tunnel furnaces,

The nitrogen in the liquid injection room and the formation room is mainly used for functions such as breaking the vacuum and accelerating heat conduction. The breaking of the vacuum should be well understood. After the battery is evacuated, the battery you see may be deflated, and the internal pressure is much lower than External, at this time, in order to avoid damage to the battery and equipment, nitrogen is charged to maintain the air pressure, so that the internal and external air pressure is roughly the same.

5) Helium

Helium is used less, but due to the airtightness of vacuum testing, in recent years, the detection of missed judgments and misjudgments is not ideal, so helium is now used to test the sealing performance of batteries. The accurate leakage value can reach about 1pa. However, the amount of use is small, so most of them are outsourced, and no special equipment for producing helium is needed.

As we all know, the production of lipo battery 100c has strict environmental requirements, and maintaining a low moisture content, suitable temperature, and low cleanliness are the basic requirements that a workshop should have.

Lipo battery 100c factory auxiliary equipment: environmental control equipment

The so-called environmental control equipment refers to the integration of a series of equipment required to maintain workshop production and control workshop temperature, humidity, cleanliness and so on. Combined with the lipo battery 100c factory, there are mainly NMP recovery systems, dehumidifiers, dust collectors, air conditioners, water (pure water, chilled water, cooling water), which are outlined below.

1) NMP recycling system

Open the factory's process documents, in the positive electrode mixing process, you will see the NMP required for adding glue, then add PVDF glue, add the main material of the positive electrode and the conductive agent, stir well, and then the mixing is completed. In the coating process, through the oven, the NMP is recovered, and the treated gas can be discharged into the air.

The used, dirty and waste N-methylpyrrolidone cannot be recovered directly because of its high boiling point. It can be heated to 130°C- At 150℃, NMP can be recovered, and the residual NMP polymer and impurities are discharged from the system and sent to the power plant for incineration treatment, which ensures the recovery quality and waste treatment, and improves the recovery safety factor. Commonly used are refrigerated and rotary recovery systems.
Freeze recovery type, using cooling water and chilled water coil to condense NMP out of the air, and then collect and purify to achieve the purpose of recovery. After the exhaust gas is concentrated to a certain concentration, NMP can be condensed and recovered by the freezing method.

The runner recovery type, the VOC runner adopts the molecular sieve runner of Japan's Western Technology Research Institute. The runner is divided into 3 areas, one is the treatment area, the other is the cooling area, and the other is the desorption area. The VOC runner is slowly in the working process. Rotation, the gas containing organic solvent to be treated becomes relatively clean gas after flowing through the treatment zone, and the content of organic solvent in the treated gas can be reduced to below 50ppm at least. Another part of the air containing organic solvent flows through the cooling area under the action of the regeneration fan, and then after being heated to a certain temperature, it flows through the regeneration area of ​​the runner.

Since the regeneration area of ​​the runner is heated by the regeneration air, it is adsorbed in the regeneration area. The organic solvent evaporates and is carried away with the regeneration air. When the runner is working, the ratio of regeneration air to treatment air is 1/5 (concentration multiple is 5 times), and the concentration of organic solvent in the regeneration air can be 5 times the concentration before treatment.
The energy consumption of the refrigerated recovery is relatively low, and the energy consumption of the runner type is high, but it is more environmentally friendly, and the waste gas can be directly discharged into the atmosphere after treatment.

2) Dehumidifier

Generally, it can be divided into two categories: civil dehumidifiers and industrial dehumidifiers, which belong to a member of the air-conditioning family.
Generally, a conventional dehumidifier consists of a compressor, a heat exchanger, a fan, a water container, a casing and a controller.
Its working principle is: the humid air is drawn into the machine by the fan, and passes through the heat exchanger. At this time, the water molecules in the air are condensed into water droplets, and the treated dry air is discharged out of the machine. This cycle keeps the indoor humidity at a suitable level. Relative humidity.

The lipo battery 100c workshop has strict requirements on humidity. We have a relative humidity (RH) and dew point (℃) to represent the humidity. At a certain temperature, the two can be converted. In the lipo battery 100c workshop, when the humidity is not required, the normal 40%-50% RH is sufficient, but the liquid injection room and the high temperature aging room should be controlled at -60 ℃ dew point, and the moisture should be strictly controlled.

3) Dust collector

In the production of lipo battery 100c, there will be pole pieces cutting, powder falling, and the movement of people will also drive dust to float, and dust, especially metal dust and particles, fall into the battery pole pieces, which will increase the short circuit of lipo battery 100c It is also an important reason for the accelerated self-discharge of lipo battery 100c.

Dust collectors, in addition to some equipment with built-in dust collection and dust removal functions, such as laser cutting machines, will collect the cut dust and discharge it to the outdoors, but most of the equipment does not have dust removal functions, and requires several other dust removal equipment. The FFU dust removal system is commonly used in the lipo battery 100c factory. We usually express the cleanliness by grades, such as the commonly used grades 100,000 and 10,000.

The smaller the number, the higher the cleanliness.
The full name of FFU in English is (Fan Filter Unit), and in Chinese it is a fan filter unit. FFU is equipped with primary and high-efficiency two-stage filters. The fan sucks the air from the top of the FFU and filters it through the primary and high-efficiency filters. The filtered clean air is sent out at a uniform speed of 0.45M/S±20% on the entire air outlet surface. Multiple units can be connected in series to achieve the effect of purifying the air. FFU has long working time, low noise, maintenance-free, small vibration, stepless speed regulation, uniform wind speed, and easy installation.

4) Air conditioner

The biggest feature of the workshop air conditioner is energy saving and environmental protection, and at the same time has an excellent cooling effect. Workshop air conditioners are mainly divided into water-cooled air conditioners and water-evaporative air conditioners (wet curtain air conditioners). The scope of application is mainly for places requiring high humidity (such as textiles, planting, etc.), and some indoor installations can be used in the design.

Controlling the workshop temperature within a suitable range for the human body can make employees more focused and happy. Makes the product in terms of production efficiency and quality have a good improvement. In a suitable temperature environment, the heat generated by the equipment can be absorbed or discharged in time, so that the equipment can be maintained in a stable temperature environment, which can increase the service life of the production equipment, and virtually save the company's next maintenance and update costs.
In the lipo battery 100c factory, except for special areas such as high temperature aging rooms, the temperature is generally controlled at 23±2℃.
water system

Although the lipo battery 100c is afraid of water, it is inseparable from water in production. Deionized water is used for slurry mixing when the negative electrode is commonly used for coating. In order to maintain a stable temperature, cooling water circulation is required.
Cooling water and freezing water are not only different in temperature, but also in function. Cooling water is used for circulation to take away heat and cool down. The equipment will generate heat during operation. Excessive heat will damage the equipment. Therefore, cooling water needs to be circulated to take away heat and maintain the equipment.

Chilled water has the function of cooling, and is often used at the end of the air-conditioning unit to lower the temperature.
lipo battery 100c factories usually need to use pure water preparation units and chillers. The pure water preparation unit is used to prepare deionized water. After the conductivity reaches our requirements, it can be used for lipo battery 100c anode slurry mixing, lipo battery 100c cleaning and other processes. Chillers are mostly used in air conditioning and other systems to achieve the effect of cooling and removing heat.

Lipo battery 100c factory auxiliary equipment: logistics equipment

Logistics equipment, here I mainly divide it into transfer tools, pallets, and logistics lines.

1) Transfer tool

Transfer tools, in the lipo battery 100c workshop, are mainly responsible for the transportation of raw materials and pole pieces. Commonly used transfer tools include electric and hydraulic forklifts, lift trucks, cache racks, flatbed carts, and AGV trolleys. In factories that are not very automated, or when the intermediate transportation links fail, we can use these equipment to transport. For example, it is generally transported by pipeline from mixing pulp to coating. If the pipeline fails, it needs to be transported by forklift to transfer the pulp barrel to the coating area, so as not to delay normal production.

2) Tray

The reason why the tray is proposed separately is that the tray is responsible for the transportation and storage of all semi-finished cells and finished cells in the battery factory. A suitable tray can carry and protect the cells well. I have seen a tray full of batteries fall from a 3-meter-high shelf, the tray is intact, and the battery has not leaked out, but the ground is damaged, and I have also seen the tray clamped by the elevator, deformed, twisted, squeezed After half an hour, you can continue to use it.

In the lipo battery 100c workshop, the most demand is in the assembly line and chemical composition area. The assembly line is a small tray. Generally, one or two cores are transported. The battery is not directly transported. However, attention should be paid to the protection of the surface of the core and the cleaning of the tray. The core is very fragile without the protection of the casing. The pallet in the chemical composition area is used to transport batteries. In order to save space and increase efficiency, the chemical composition is now in a layered cabinet point type. One cabinet can charge and discharge dozens of batteries at the same time, and it is manually transported to high altitudes. It's not realistic to go to the closet.

3) Logistics line

The logistics line is the sum of the systems that use logistics equipment for transportation. The transportation and delivery of pallets need to have a path, just like driving on a high-speed in an orderly manner. Now the application of logistics lines has greatly improved the factory's production efficiency. Efficiency is also the right-hand man for unmanned factories.

The logistics line of the lipo battery 100c workshop is mainly concentrated after the assembly line. After winding from the core, it is transported through a small special tray for hot pressing, gluing, pre-welding, shelling, cover welding and other processes. After the assembly is completed, it will be transported to the chemical composition and volume separation through the logistics line. As I mentioned just now, the chemical composition capacity may be a very high three-dimensional cabinet. At this time, a stacker is required to transport a tray of fully loaded batteries to each layer. The cabinets are put up, and then shipped out after the end, and transported to the three-dimensional warehouse storage through the logistics line, which greatly improves the efficiency of the factory and reduces the cost.