Key points of lithium ion battery production process control – Semco university

Introduction:

Lithium Ion Battery Production Process in sets of electrodes and then assembled in cells. Active material is mixed with polymer binders, conductive additive, and solvents to form a slurry that is then coated on a current collector foil and dried to remove the solvent and create a porous electrode coating.

There is no single lithium-ion battery. With the variety of materials and electrochemical couples available, it is possible to design battery cells specific to their applications in terms of voltage, state of charge use, lifetime needs, and safety. Selection of specific electrochemical couples also facilitates the design of power and energy ratios and available energy.

Content:

• The principal of lithium battery,
• The structure of lithium battery,
• Ingredients mixing,
• Coating,
• Rolling cold,
• Die cutting,
• Winding,
• Assembling,
• Laser welding,
• Cell baking,
• Injection electrolyte,
• Form inotropies,
• Ageing,
• Divide capacity,
• Pack Process,

Working Principle

The working principle of a lithium-ion battery refers to its charging and discharging principle. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon as the negative electrode has a layered structure.

The Structure of Lithium Battery:

The structure of an individual lithium battery is simple and made up of three basic components; a cathode, an anode, and an electrolyte. A separator is also used, which prevents the cathode and anode from touching. Lithium polymer batteries are widely used due to their efficiency and high capacity.

• Cathode – The active material is generally lithium manganate or lithium cobalt oxide, nickel cobalt lithium manganate material, and electric bicycles generally use nickel cobalt lithium manganate (commonly known as ternary) or ternary + a small amount of manganese acid Lithium, pure lithium manganate and lithium iron phosphate are gradually fading out due to their bulkiness, poor performance or high cost. Electrolytic aluminum foil with a thickness of 10–20 microns is used for the conductive electrode fluid.
• Diaphragm – a specially shaped polymer film, the film has a microporous structure, which allows lithium ions to pass freely, but electrons cannot.
• Anode—the active material is graphite, or carbon with a similar graphite structure, and the conductive current collector uses an electrolytic copper foil with a thickness of 7-15 microns.
• Organic Electrolyte – A carbonate-based solvent in which lithium hexafluorophosphate is dissolved, and a gel-like electrolyte is used for polymers.
• Battery case – divided into steel case (square type is rarely used), aluminum case, nickel- plated iron case (used for cylindrical batteries), aluminum-plastic film (soft packaging), etc., as well as battery caps, it is also the positive and negative terminals of the battery.

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1. Ingredients Mixing:

Process Requirements –

• Solid content.
• Viscosity.
  • Solid content.
    • Confirmation of process formula.
    • The accuracy of measurement.
  • Confirmation of process flow.
    • Viscosity (positive electrode: 4500-5500cps, negative electrode: 4000-5000cps)
    • Setting of stirring parameters (revolution: 25HZ, rotation: 30HZ)
    • Confirmation of water cycle effect.
    • The vacuum level of the mixer (-0.009Mpa).

Control Points:

• Keep the equipment dry and control the temperature and humidity of the workshop.
• The positive electrode dehydrates the raw material, and it is generally baked at 120°C for about 2 hours under normal pressure.
• Dehydration of NMP. Use dry molecular sieve for dehydration or use special reclaiming facilities for direct use.
• After adding the conductive agent and active material, the slurry should be uniform, no there are agglomerated particles, and the air bubbles in the slurry should be removed.
• The dissolution process of PVDF is relatively slow. Before pulping, PVDF should be dissolved in NMP in advance. CMC is also a difficult solution. Before pulping, CMC should be dissolved in water in advance. PVDF and CMC should be fully dissolved and dispersed evenly. If there is a particle binder or thickener must be added when stirring or change the mixing process from time to time.
• The mixer work is divided into four stages, the first and second stages are not Turn on the vacuum, and do not adjust the speed of stirring and dispersing too much High, to initially complete shearing, dispersion, kneading, collision, emulsification after the process, the slurry reaches a certain degree of fineness, uniformity and viscosity.
• Vacuum after request.

Precautions:

• Once a problem is found during operation, it must be recorded and notified to the relevant departments in time, so that it can be cleaned up in time
• Except for the necessary maintenance personnel, it is strictly forbidden for non-personnel to operate the equipment or change the parameters
• The concentration (solid content) of the slurry should be gradually adjusted from high to low to avoid increasing trouble;
• During the intermittent process of stirring, attention should be paid to scraping the edges and bottoms to ensure uniform dispersion;
• The slurry should not be put on hold for a long time to avoid precipitation or decrease in uniformity;
• The materials to be baked must be sealed and cooled before they can be added to avoid changes in the properties of the components;
• The length of the stirring time is mainly based on the performance of the equipment and the number of materials added;
• The use of the stirring paddle is replaced by the difficulty of slurry dispersion. If it cannot be replaced, the speed can be adjusted from slow to fast to avoid damage to the equipment;
• Screen the slurry before discharging to remove large particles to prevent belt breakage during coating;
• Operators must receive pre-job training before they can hold a certificate and strictly abide by the operating procedures
• After the stirring is completed, clean up the equipment and working environment in time for 5S;
• When operating the machine, pay attention to safety to avoid injury to the head.

2. Coating:

Process Requirements –

• Areal density of pole pieces
• Pole piece size
• Dryness of the pole pieces
  • Areal density of pole pieces
    • Confirmation of substrate areal density.
    • Reasonable blade adjustment.
    • Confirm that the film width and coating thickness are correct.
    • The height of the liquid level in the tank.
    • Agitation of the slurry.
    • Consistency of density on both sides.
  • Coated size
    • Process requirement confirmation.
    • Confirmation of substrate size.
    • Confirmation of coating width.
    • Confirmation of coating length.
    • Confirmation of coating gap.
    • Confirmation of the corresponding effect of single- and double-sided coating.
  • Dryness of coating
    • Segment temperature and speed setting.
    • Confirmation of temperature requirements for process stages
    • The difference between the actual temperature and the set temperature.
    • Damper adjustment.
    • Influence of external ambient temperature.

Control Points:

• To ensure the consistency of coating as much as possible, attention should be paid to the change of slurry viscosity, the change of liquid level on the hopper, and the coating speed during operation the change;
• The thin layer of slurry on the aluminium foil is dried in the oven to remove the NMP solvent (NMP boiling point 202 °C, flash point 95 °C). Drying too slowly, the coating surface is fluid, the thickness is unstable, drying is too fast, and the surface is deformed. To form a PVDF film layer, the volatilization of the internal NMP solvent will cause the surface layer to wrinkle. In order to ensure the uniform evaporation of NMP, stage drying is usually used, and the temperature in the middle section is the highest. The positive electrode is generally 100-130 °C, and if the negative electrode adopts a water- based system, the drying temperature is generally 75-90 °C; and the NMP volatilizes during the drying process, and the composition of the coating slurry changes constantly, so the amount of NMP solvent used to prepare the slurry, the temperature increases the method and heating time have an impact on this;
• If the heating temperature or time is not enough, it is difficult to remove the liquid in the slurry, so that part of the binder is dissolved, causing the active material to peel off; If it is too high, the binder will be crystallized, and the active material will also be peeled off. fall, resulting in a short circuit in the cell. In addition, the drying temperature and drying. Improper drying time will also cause oxidation of aluminium foil and wetness of the pole piece;
• Coating and drying should be done with three inspections for the first piece—thickness, quality and size meet the requirements, and the corresponding drawing speed, baking time, gap etc.

Precautions:

• Operators must receive pre-job training qualified certificate to work, and strictly abide by the operating procedures.
• Except for the necessary maintenance personnel, it is strictly forbidden for people who are not in this position operator to operate the device or change parameters.
• The dryer extension must be confirmed to be activated before the air can be activated heater.
• The hoppers must be cleaned with alcohol immediately after each shift stops. Scraper, coating roller and back roller, etc., the surface shall not be scratched marks and damage.
• Pay attention to keep the back roller cylinder and the linear scoring roller clean and lubricating.
• The bearing parts of the machine must be lubricated regularly, and the gear box must be lubricated regularly. Oil must be changed or replenished regularly.
• Once a problem is found during operation, it must be recorded in time and notify relevant departments for timely cleaning.
• Always do 5S work, maintain equipment and surrounding environment clean.
• Keep the equipment dry and control the temperature and humidity of the workshop.
• When operating the equipment, pay attention to safety to avoid being scalded by the oven hurt.

3. Rolling Cold:

Process Requirements –

• Rolling
• The compaction density of material
  • Speed frequency (≤50HZ)
  • Rolling pressure (≤30Mpa)
  • Roller Gap (≥0.05mm)
• The Consistency of the gap on both sides
  • Relative humidity (<35%RH)
  • Ambient Temperature (23〜30℃)

Control Points:

• Rolling should pay attention to the thickness in line with the process requirements;
• When pressing, pay attention to air bubbles, material drop, deformation of pole pieces,
• The larger the roller diameter of the roller machine, the better;
• The pole piece is broken, in the process of rolling, the break not only affects the work efficiency, but also troubles the subsequent slitting, winding and other processes.
• The pole piece is seriously warped. After the pole piece is rolled, sometimes the pole piece will appear A large degree of concave and convex phenomenon, this phenomenon is unfavorable Slitting and winding of pole pieces
• Pole piece horizontal and vertical thickness
• Severely wavy pole piece
• Such as scraping when measuring the thickness of the pole piece, the problem points are not marked in time, etc. Human error can be addressed through increased training and awareness.
• Adjust the correction and tension when the pole piece is wound, and the winding should be neat
• Insufficient pressure, rolling thickness is not in place, assembly is difficult, winding is not correct the position is inaccurate, which may cause safety problems in severe cases,
• The roller surface is not smooth – the surface of the pole piece is not smooth or even has burrs, causing batteries short-circuit, self-discharge, and even safety issues

Precautions:

• Operators must receive pre-job training and pass the work with a certificate and strictly abide by the operating procedures
• Except for the necessary maintenance personnel, it is strictly forbidden for people who are not in this position operator to operate the device or change parameters
• Before starting the roller press, use dust-free paper to dip the rollers in absolute ethanol the rollers of the press are cleaned.
• When cleaning the rollers, a person must be on the back of the device to avoid work-related injuries due to operational errors
• To prevent clothes and hair from being entangled in the machine Inside, please wear well-fitting clothing when working.
• When the rolling is completed, release the pressure to the rolling machine in time.
• Once a problem is found during operation, it must be recorded in time and notify relevant departments for timely cleaning
• Do it all the time 5S Work, maintain equipment and clean surroundings
• Keep the equipment dry and control the temperature and humidity of the workshop
• When operating the equipment, pay attention to safety so that your hands are not brought into the under the wheel

4. Die Cutting:

Process Requirements –

• Die Cut Size
• Pole Burrs
  • Die Cut Size
    • Sensing effect of infrared sensor
    • Specification of the die
    • Transfer belt speed adjustment
    • Exception handling
  • Pole Burrs
    • The integrity of the die
    • The sharpness of the die

Control Points:

• There is no powder in the edge area, and the powder is leaking from the metal pole piece, the positive electrode leakage of metal, the corresponding negative electrode is insufficiently inserted with lithium and the negative electrode leaks gold genus, lithium precipitation will occur. Generate dendritic lithium, pierce the isolation film, causing a short circuit of the cell, which has a great safety hazard.
• Wavy edge, pole piece appears arc, assembly is difficult, winding inaccurate alignment may cause battery short circuit or even short circuit in severe cases, safe question.
• The size of the pole piece meets the process requirements; the pole piece with unqualified size When the sheet is wound, it will cause poor coating, resulting in short circuit of the cell, a security incident occurred
• The burrs meet the process requirements. The incision has burrs – causing electrical battery short circuit, self-discharge and even safety issues
• When winding, the pressure rod must be pressed down to avoid warping. Phenomenon
• The position of the mark hole should meet the requirements of the winding equipment.

Precautions:

• Operators must receive pre-job training before they can hold the certificate work & strictly abide by the operating procedures.
• Except for the necessary maintenance personnel, it is strictly forbidden for those who are not in this position Operate the device or change parameters
• The hood and the station board are part of the safety device, never operate it in a disassembled state.
• In order to prevent clothes and hair from being entangled in the machine, please wear well-fitting clothing when working.
• When performing maintenance, inspection, etc. that require contact with the machine, be sure to lock the red stop switch
• Once a problem is found during operation, it must be recorded in time and notify relevant departments for timely cleaning and maintenance
• Do it all the time 5S Work, maintain equipment and clean surroundings
• Keep the equipment dry and control the temperature and humidity of the workshop

5. Winding:

Process requirements –

1. Polar ear
2. Wrapping of the core pack
3. Appearance of the core pack
4. Polar center distance
5. The pole ears and pole pieces are not broken
6. The polar ears are not wrinkled
7. Tab center distance meets specifications
8. Wrapping of the core pack

• The overhang at the head and tail meets the process requirements.
• Overhang conformity engineering of separator, positive electrode and negative electrode artistic requirements
• The position of the Mark hold should meet the requirements of the winding equipment
• Appearance of the core pack
• The diaphragm is not damaged or cracked
• The termination tape has no wrinkles and cannot extend beyond both ends of the cell the edges area of the separator paper
• The core package has no core pulling, black circle, and diaphragm should be flush.

Control Points:

• Winding the head and tail, the negative electrode exceeds the positive electrode by more than 5 mm
• When the cell is wound, the overhang at the upper and lower ends must meet the process specifications. If the specifications are exceeded, there will be a safety short circuit in the early stage or a later stage. There will be safety accidents, x-ray sampling core package.
• The alignment of the positive and negative plates is uneven, and the active area of the positive electrode exceeds the negative electrode. Active area with security risks.
• The separator is damaged during operation – resulting in a short circuit of the battery or large self-discharge, even causing safety problems.
• Post Termination Tape with appearance, no folds on toes, can’t go beyond at the edge of the diaphragm at both ends of the cell.
• Core appearance, no core pulling, black circle and diaphragm need to be flush.
• There is no obvious dislocation of the polar ears.
• The manual core pack is yes, the core pack must be held tightly to avoid artificial caused by core pulling.

Precautions:

• Operators must receive pre-job training before they can hold a certificate and strictly abide by the operating procedures.
• Except for the necessary maintenance personnel, it is strictly forbidden for non-personnel to operate the equipment or change the parameters.
• Before the winding machine is turned on, the winding worker inspects whether the screws of each component are loose, whether there is a leakage of each sealing component, and whether the working environment is clean.
• Check whether the rewinding shaft and the spare shaft are in the working position, all the movements of the winder must return to the origin.
• Set the coil length and tension of the winder according to the requirements of the production order and the production process sheet.
• When lifting the reel, it should be slow and steady, and the equipment should not be damaged by brutal operation.
• When winding the splicing tape, the instrument must be stopped to prevent the hand from being pressed when the splicing tape is being wound.
• When the winder is running, no one is allowed to enter the running area.
• Once a problem is found during operation it must be recorded and notified to relevant departments in time for timely cleaning and maintenance.
• Do it all the time 5S work, maintain equipment and clean surroundings.
• Keep the equipment dry and control the temperature and humidity of the workshop.

6. Assembly:

Process requirements-

• Ear integrity
• Ultrasonic welding and soft joining laser welding effect.
• The integrity of the casing core.
  • The integrity of the tab punching.
    • The pole ears and pole pieces are not broken.
    • The polar ears are not wrinkled.
  • Integrity of ultrasonic welding.
    • There is no crack in the appearance of the positive & negative welding areas.
    • The edge of the gasket is not lifted.
    • The peeling residue in the solder printing area is more than 50%.
  • The battery cell is in good condition.
    • The cell must be free of short circuit.
    • The surface is smooth and free of damage.
    • The shell has no burrs and water chestnuts.
    • When put into the case, the cell must not be scratched.

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Control Points:

• The hot-pressing pressure is too large or too small – the pressure is too large, which can easily cause the cell to be crushed and short. If the pressure is too small, the cell pressure is not in place, which affects the next operation.
• There is no crack in the appearance of the welding area during ultrasonic welding, avoiding false welding, which will lead to the battery is disconnected or the internal resistance is too large.
• Improper position of laser welding, when the battery is subjected to external vibration or collision. It can completely avoid the internal short circuit of the battery, which is prone to safety problems.
• Do a good job of preventing welding slag, and the welding slag cannot enter the cell.
• There is no folding and no edge when the polar ear is glued, and it can be completely covered.
• Try to avoid it when hot multi-meter phenomenon of film pulling.
• During pre-welding, ensure that the top cover and the shell are completely coincident, and the no depressions, no protrusion and no gaps.
• When final welding, use a vacuum cleaner to vacuum the top of the cell once to remove dust. Foreign matter on the surface of the weld zone.
• Keep the core package surface clean during assembly.
• Do not stab the core pack with gravity or sharp objects during transportation. Short circuit through diaphragm.

Precautions:

• Operators must receive pre job training before they can hold a certificate and strictly abide by the operating procedures.
• Expect for the necessary maintenance personnel, it is strictly forbidden for non-personnel to operate the equipment or change the parameters.
• Must keep every step of the 5S cleaning, any post 5S unqualified batteries will result in batches of defective batteries.
• Wear heat-insulating gloves during hot pressing and hot melting operations.
• Safety goggles and heat resistant gloves must be worn in laser welding positions.
• The battery must be cleaned when it is put into the case cassinette case of film drawing.
• Choose an intact aluminium case, do not hit the aluminium case with gravity.
• When the same problem occurs frequently in each process, production must be stopped, the problem points must be identified, and improvement plans must be made, and preventive measures must be formulated. Avoid similar situation in the future.
• Keep the equipment dry and control the temperature and humidity of the workshop.
• Regularly maintain the equipment and eliminate equipment factors before production.

7. Laser Welding:

Process Requirements –

• Integrity of shell and top cover.
• Cell pre-soldering effect.
• The effect of final welding.
  • Shell and top cover integrity.
    • There is no obvious gap between the top cover and the shell after entering the shell.
    • There is no foreign matter between the shell and the top cover.
  • Cell pre-soldering effect.
    • The middle area of the top cover is completely stable with the shell.
    • The spine was not damaged by the laser.
    • After pre-welding, the top cover will not be lifted or dented.
  • The effect of final welding.
    • The cell has no explosion point phenomenon.
    • The air tightness of the cell is qualified.
    • The surface of the welding area has metallic lustre and no oxidation.
    • After welding, the top cover will not be lifted or dented.

Control Points:

• Adjust the pressure of the productive gas.
• Welding protection for pre-soldering and final welding.
• After pre-soldering do a cleaning job to remove the meter dust or other foreign matter.
• Unstable welding power prone to welding leaks leading to the battery is leaking gas or liquid.
• Debris explodes during welding causing battery leakage or liquid leakage and affect the appearance of the battery.
• Poor welding positioning resulting in low battery welding pass rate and affect the appearance of the battery.
• Optimize welding parameters to reduce burst rate.
• The welded cells should be tested for air tightness, if there is any leakage detection or false detection affects the filling of the battery and the appearance of the cover plate leak.

Precautions:

• Operators must receive pre-job training before they can hold a certificate and strictly abide by the operating procedures.
• Except for the necessary maintenance personnel, it is strictly forbidden for non-personnel to operate the equipment or change the parameters.
• Laser welding positions must wear protective goggles.
• The temperature of the battery core is relatively high after welding, so wear heat insulating gloves.
• Regularly clean the welding slag of the welding torch head to prevent the welding slag from blocking the laser.
• Regularly replace the protective lens of the welding torch. If there is too much welding slag, the laser cannot be focused.
• When the same problem occurs in each process, it must stop and find the problem point before starting production and make a summary to avoid future occurrences similar situation.
• Keep the equipment dry and control the temperature and humidity of the workshop.
• Regularly maintain the equipment and eliminate equipment factors before production.

8. Cell Baking:

Process Requirements –

• Drying capacity
  • Confirmation of process baking temperature (95℃).
  • Baking cycle setting, (heating drying, thermal insulation drying, nitrogen change, vacuuming, thermal insulation drying).
    • Requirements for vacuum degree (-0.09MPa).
    • The reequipments of the turnover environment the temperature is 20 ℃ ~ 30 ℃, the relative humidity is less than 45%, and the injection room must be entered through a special channel.

Control Points:

• Temperature out of control high temperature will damage the battery, too low temperature will affect the removal of water, resulting in low battery capacity, unstable internal resistance, poor circulation and abnormal dimensions.
• Not up to standard when vacuuming-insufficient vacuum will affect the removal of moisture from the battery.

Precautions:

• Operators must receive pre-job training before they can hold a certificate and strictly abide by the operating procedures.
• Except for the necessary maintenance personnel, it is strictly forbidden for non-personnel to operate the equipment or change the parameters.
• After baking the cells, wait for the cells to cool down before taking out the cells.
• Keep the equipment dry and control the temperature and humidity of the workshop.
• Regularly maintain the equipment and eliminate equipment factors before production.

9. Injection:

Process Requirements –

• Liquid injection environment requirements.
• Precise Injection volume.
• Battery surface cleanliness.
• Liquid injection environment requirements.
  • Temperature 23°C~27°C, dew point <-45°C.
• Precise injection volume.
  • Injection pump adjustment, calibration and zeroing of electronic scales.
• Battery surface cleanliness.
  • Prevent the electrolyte from remaining in the shell, and absorb it in time if there is electrolyte.
  • Wipe clean with a strong water-based rag / dust free paper.

Control Points:

• Inaccurate amount of fluid injected-excessive fluid injection can cause battery damage leakage and drum shell, too little will lead to poor battery capacity foot, large internal resistance, low platform and poor circulation, etc. question.
• Poor isolation from the outside world during injection-easy to cause increased water content in the battery, resulting in low battery capacity, large internal resistance, low platform and poor circulation, etc.
• The water content of the electrolyte must be checked before injection.

Precautions:

• Operators must receive pre-job training before they can hold a certificate and strictly abide by the operating procedures.
• Except for the necessary maintenance personnel, it is strictly forbidden for non-personnel to operate the equipment or change the parameters.
• Liquid injection operators must take protective measures. Corrosive keep away from eyes, mouth & skin. In case of accidental contact, rinse immediately with clean water wash in severe cases, press the strong acid burn and seek medical attention.
• Do not store electrolytes stored for a long time in glass products.
• Regularly check whether the fasteners of the liquid injection machine are loose, and whether the sensors, motors, cylinders, solenoid valves, etc. are faulty so as to avoid unnecessary loss.
• Before and after injection, the equipment must be maintained after injection 5S qualified.
• Keep the equipment dry and control the temperature and humidity of the workshop.
• Regularly maintain the equipment the eliminate equipment factors before production.

10. Into PIEF:

 Process Requirements –

• Whether the formation time is a legal process.
• Confirmation of the formation process.
• Chemical step and parameter setting.
  • Correspondence between the two poles of the battery and the two poles of the forming cabinet.
  • Inspection of the charging process and timely handling of abnormalities.

Control Points:

• Set the steps according to the process requirements, charge with a small current, the final voltage is not higher than 3.7V.
• Design the process according to the material.
• The temperature has a great influence on the formation, so it is necessary to control the forming temperature.
• The formed channels and cells should be in one-to-one correspondence marked to avoid confusion.
• When the negative pressure is formed, pay attention to control the finger of the negative pressure number.
• Pay attention to the positive and negative of the battery and the positive and negative of the chemical equipment correspond.

Precautions:

• Except for the necessary maintenance personnel, it is strictly forbidden for those who are not in this position to operate equipment or changing parameters.
• After the battery cell has been left to stand, check each point immediately. Current and voltage, for abnormal voltage or 0 voltage cells. Immediately check whether the cause of the device or the data cable is not connected to the system. Reason for the battery itself is that the battery is abnormal immediately take out the corresponding battery.
• Abnormal fluctuation jumps or electrical currents in voltage and current during formation.
•  Pre-job training before they can hold a certificate and strictly abide by the operating procedures. The current is normal and the battery that has been unable to charge the voltage will stop forming immediately.
• Keep work surfaces and equipment clean at all times.
• Keep the equipment dry and control the temperature and humidity of the workshop.
• Regularly maintain the  equipment and eliminate equipment factors before production.

11. Battery Aging:

Process Requirements –

• Aging temperature setting 40°C~45°C.
  • Inspection during aging.
    • Prevent the aging temperature from changing too much.
    • Prevent battery aging short circuit, spontaneous combustion.
  • Full battery Inspection after aging.
    • Pick out batteries that are over-discharged, hot or swollen.

12. Divide Capacity:

Process Requirements –

• Confirmation of volume distribution process.
• Dividing work steps and parameters settings.

Control Points –

• Each gear corresponds to the specification of the battery.
• The identification of the battery under the cabinet.
• Battery model, production batch, nominal capacity, capacity sorting grade, internal resistance, voltage, etc.
• The requirements of the environment for the separation of capacity.
• Temperature (20°C~30°C), relative humidity (<60%).
• Inspection of the capacity distribution process. To prevent poor battery contact, resulting in inaccurate distribution. Prevent internal or external short circuit of the battery from causing fire and burning wait for the accident.

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13. Pack Process Validation:

Process Requirements –

• Assembly method, external dimension requirements, electrical performance requirements, charging and discharging interface.
• Matching cell requirements.
• Model, capacity grade, internal resistance, voltage (K value), external dimensions.
• The choice of power manager.
• Requirements for overcharge, over discharge and short circuit protection.
• Assembled firmness and heat dissipation device.
• The firmness of connecting modules and connecting hardware.
• Reasonable configuration of module cooling device.

Conclusion

The key points of control in the battery process are roughly shared with you. Specific parameters it is just an example, not the data in production. In the actual production in the future, the process parameters issued by the technical department shall prevail!

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