Empowering the Future of Lithium Battery Manufacturing: Exploring Ef#BatteryManufacturingInnovation #Lithium #EnergyStorage

"Empowering the Future of Lithium Battery Manufacturing: Exploring Efficiency and Innovation in the Production Process"

Lithium battery is the most mature energy storage technology in the development of energy storage battery, but due to the lithium-ion chemical nature is relatively active, in the process of lithium battery preparation, the production environment, production process parameters, material ratios, and other aspects of the factors, will affect the use of the battery after the finished product performance and safety performance.

1. Heat treatment of positive and negative materials

Heat treatment of positive and negative materials specifically refers to the use of high temperatures to remove impurities and water in the materials before mixing the positive and negative electrode materials, so as to avoid affecting the usability of the finished battery. However, in the heat treatment of positive and negative electrode materials, there are several potential problems as follows:

(1) The heat treatment temperature is on the high side, which leads to caking of positive electrode material, thus directly affecting the subsequent battery preparation process;

(2) The heat treatment temperature is low, resulting in moisture and impurities that cannot be removed cleanly, causing problems such as low capacity of the finished battery after use and bulging of the battery.

Therefore, in the heat treatment of positive and negative electrode materials, it is necessary to strictly control the heating temperature to avoid the problem of high or low temperatures.

2.Stirring of positive and negative electrode materials

Stirring of positive and negative electrode materials refers to using a mixer to fully disperse and mix positive and negative electrode raw materials respectively. The potential problems in this process are as follows:

(1) Uneven mixing makes the material distribution inside the battery deviate, which may reduce the capacity of the battery, increase the internal resistance of the battery, reduce the cycle life of the battery, and even cause safety problems in serious cases;

(2) Impurities are mixed in the mixing process, and the mixed impurities may puncture the diaphragm, causing short circuit in the battery, self-discharge abnormality, reducing the battery life, and generating safety problems.

Therefore, during the mixing process, it is necessary to pay attention to the homogeneity and purity of the positive and negative electrode materials respectively.

3. Pulping

Pulling refers to spreading the evenly mixed positive and negative electrode materials evenly on the surface of the substrate and drying the materials. There are the following potential problems in this process:

(1) Uneven thickness of pulping and deviation of material distribution inside the battery may reduce the battery capacity, increase the internal resistance of the battery, reduce the cycle life of the battery, and in serious cases, even cause safety problems;

(2) Unstable drying temperature, affecting the bonding performance of the pole piece, resulting in a decrease in the amount of positive and negative materials, thus affecting the performance of the finished battery.

Therefore, the parameters of the pulping machine need special attention in the production process, and need to keep the parameters in an appropriate range, to avoid reducing the quality of battery production due to process parameters.

4.Scraping powder

Scraping refers to scraping off the invalid position on the pole piece and the lug position of the coating material. In this process, there are the following potential problems:

(1) Scraping powder size deviation, resulting in the battery positive and negative electrodes can not match, causing battery safety issues;

(2) Scraping the substrate, resulting in the substrate material breakage or burr, the above defects may puncture the battery diaphragm in the subsequent process, causing battery safety problems.

In the process of scraping powder, we should strictly control the size of scraping powder and the position of scraping powder to improve the quality of scraping powder process.

5. Rolling

Rolling refers to the use of machinery through the pressure of the roller head, the positive and negative electrode materials on the battery electrode compaction, to increase the density of battery active substances, and make the thickness of the coating material in the appropriate range. This process has the following potential problems:

(1) Roler head pressure is too small, resulting in material thickness is large, resulting in the latter process of winding alignment is not allowed, difficult to assemble the problem, and in serious cases will produce safety problems;

(2) The roll surface is not flat, resulting in the surface of the pole piece is not smooth, and in serious cases, it may produce burrs, which may puncture the diaphragm and cause short circuit in the battery, and the danger of self-discharge abnormality.

Therefore, it is necessary to pay attention to the parameters of roll pressure degree and roll surface flatness in the roll process to avoid the quality problems generated in the roll process.

6.Slitting

Slitting refers to cutting the pole piece into different sizes according to the model demand. Potential problems in this process are:

(1) Burrs exist in the cutting edge, which can easily puncture the diaphragm in the post-process and cause the danger of short-circuit in the battery;

(2) The shape of the pole piece cutting is not regular, resulting in subsequent winding inaccurate alignment, assembly difficulties, and in serious cases will cause battery short circuit.

Therefore, in the battery production slitting process, we need to pay attention to the state of the pole piece after slitting, to ensure that the pole piece is standardized in size and shape after cutting, to improve the quality of battery production.

7. Positive and negative welding

Positive and negative electrode welding refers to connecting the positive electrode and negative electrode of the battery with the pole piece and pole lug by welding. This process is one of the most critical processes in the battery production process, in this step of the process, the biggest potential risk is that in the welding or riveting process, false welding, welding through, riveting is not solid, etc., which is prone to battery circuit breakage, increased internal resistance, affecting the performance of the battery and the cycle life.

Therefore, in the welding process of positive and negative electrodes, we should pay attention to and strictly control the welding parameters and welding environment, and check the quality of welded joints after welding, avoiding false welding and also avoiding weld-through, so as not to affect the performance and cycle life of the finished battery, and then reduce the overall quality of the battery.

8. Positive and negative stickers

Positive and negative battery sticker process refers to the use of adhesive paper to seal the possible burrs in the lug area, thus reducing the risk of short circuit in the battery caused by burrs piercing the battery diaphragm.

The potential risk of this process is that the sticker is not applied in the proper position, does not completely cover the lug burr, or adheres to the active material on the pole piece. If the burr is exposed, it may cause the diaphragm to puncture and lead to the danger of internal short-circuit in the battery, while sticking to the active substance of the pole piece may lead to the reduction of battery capacity.

Therefore, in this process, we need to control the position of the stickers and establish an inspection standard mechanism to ensure that the operation of the process is standardized and reduce the risk of subsequent battery production and preparation processes, so as to ensure the capacity and safety of the battery in use.

9. Winding

Winding refers to the process of accurately laminating the positive and negative electrodes of the battery on the basis of good segregation of the diaphragm. The potential problems of this process are:

(1) Positional deviation of the pole pieces when they are aligned, resulting in misalignment of the positive and negative materials, leaving a hidden safety hazard;

(2) Damage to the diaphragm during the winding process, resulting in a short circuit within the battery or self-discharge phenomenon exceeding the allowable range, causing safety problems.

Therefore, in the winding process, we need to strictly implement the standardized operation, focusing on the winding process of positive and negative electrode stacking, as well as the integrity of the diaphragm, to avoid the safety problems directly arising from the battery production process.

10. Core casing

Core casing is mainly the process of loading the coiled core into the shell and welding the positive and negative battery poles, which is mainly divided into the steps of flattening, applying upper and lower adhesive paper, entering the shell, welding the positive and negative lugs and welding the cap. One of the main potential problems is:

(1) The flattening process lies in the control of pressure, the pressure is too large to cause the core pressure bad and short circuit; pressure is too small will lead to the battery pressure is not in place and affect the subsequent installation.

(2) The main purpose of the upper and lower adhesive paper is to avoid direct contact between the battery cell and the shell or cover, so as to avoid internal short-circuit failure, if the adhesive paper is not properly pasted, the battery is subject to external vibration or collision, which may lead to contact between the battery cell and the shell, which may result in an internal short-circuit, resulting in a security risk.

(3) Welding positive and negative lugs and welding caps is a critical step, the instability of the welding parameters lead to false welding or weld through, resulting in increased internal resistance or even circuit breakage, which greatly affects the battery's performance and safety performance.

Therefore, in the process of battery casing, we should always pay attention to the operation specification of each step, and repeatedly check to ensure the quality of each process to improve the quality of battery production.

11.Battery Baking

Battery baking refers to the battery baking operation under vacuum environment when the electric core is put into the shell and welded, the purpose is to remove the water in the battery and ensure the battery is dry. This process may have the following problems:

(1) Unsuitable temperature, too high or too low temperature will affect the capacity, cycle life and other characteristics of the battery.

(2) Incomplete vacuuming process, resulting in insufficient vacuum, which directly affects the removal of moisture from the battery.

Therefore, in this step, we need to strictly control the temperature of the battery baking, to ensure that the baking temperature is moderate, and pay attention to the vacuum of the baking environment, to avoid the introduction of moisture in the air during the baking process, resulting in unsatisfactory baking results.

12. Short-circuit detection

Short-circuit detection refers to the baked battery, short-circuit detection, in order to exclude short-circuited batteries produced in the previous process. Once there is a short-circuit or micro-short-circuit batteries, need to be eliminated in a timely manner, otherwise in the subsequent charging and discharging, resulting in self-discharge battery failure, and in serious cases, there may also be an explosion, resulting in the production of safety accidents.

13. Liquid injection storage

Liquid injection storage step mainly refers to the process of quantitatively injecting electrolyte into the battery under vacuum, and making the electrolyte fully permeable. Too much or too little liquid injection in this process will affect the water content inside the battery, which will affect the battery capacity and the number of cycles, and more seriously, it will cause the battery to bulge, leakage and other safety problems.

Therefore, in this process, we need to strictly control the amount of electrolyte injection and keep the surrounding environment dry to avoid the impact of water on the battery.

14.Formation

Battery formation is a crucial production process, which refers to the use of small current to charge the packaged battery to activate the material activity, and at the same time generate a protective film on the anode surface to protect the entire chemical interface. The potential problems with this process are:

(1) Inadequate charging of the battery, leading to insufficient capacity of the subsequent battery, which in turn affects the performance of the battery or even leads to bulging of the battery;

(2) Improper control of the charging time will make the internal water content of the battery increase, affecting the battery capacity, internal resistance, voltage plateau, cycle life and a series of other problems.

So in the battery formation step need to strictly control the charging current and charging time, to avoid the defects of the formation step, the subsequent production and use of the battery to bring irreversible effects. Therefore, in the formation process, we need to pay attention to the charging parameters and time, to avoid defects in the formation step affect the overall performance and quality of the battery.

15.Processing and factory inspection

Battery post-production processing and factory inspection, mainly for the battery subsequent polishing, charging, dispensing and off-line inspection steps. This step as the battery production of the final "aftermath" program, the appearance of the battery and the final performance also plays a key role, the main risk is:

(1) The battery surface polishing time is too long, will cause the battery local overheating, affecting the performance of the battery;

(2) Charging process to ensure that the battery SOC reaches 50%, if the voltage control is inaccurate, easy to influence the judgment of the subsequent shipment, which may affect the production of the battery system;

(3) attery dispensing in order to ensure that the sealing of the battery seal out of the sealing, the glue is improperly formulated will not only affect the appearance of the battery, and in serious cases, will also affect the sealing performance of the battery, resulting in a decline in battery life, and ultimately affecting the ultimate use of the battery performance;

(4) shipping test as the final test step in the battery production process, can be found in a timely manner when the battery shipment problems, to avoid the problem of battery flow into the subsequent workstation, can effectively inhibit the production of defects, improve the overall quality of battery production.

Conclusion

Through the battery production process control, can effectively solve the potential problems in the production process, and effectively improve the overall quality of battery production, performance and safety performance.

At the same time, the quality of the battery to ensure that the subsequent applications to provide a stable and reliable source of energy, to promote the steady development of the new energy industry, to create a safe, high-performance new energy development environment, in order to promote the widespread use of "green" energy for the future development of society to lay the cornerstone of environmental protection, high efficiency!