The production process of battery cells

Battery manufacturing-how to deal with batteries The battery is the smallest battery in the battery system. This is the basic structure of a car power lithium-ion battery. The battery is like a container for storing electrical energy. How much capacity it can store depends on how much active material is contained in the positive and negative electrodes. The design of the positive and negative plates should be adjusted according to different models. The capacity of the positive and negative materials, the ratio of active materials, the thickness of the electrode, and the compaction density also have an important influence on their capacity. Pulping of active substances. The mixing process is to mix the active material into a pulp through a vacuum mixer. This is the first step in battery processing. The quality control of this process will directly affect the quality of the battery and the qualified rate of finished products. However, the process flow is complicated, and the raw material ratio, mixing steps, mixing time, etc. all have higher requirements. So what we are mixing here is the active material of the battery. In addition, during the mixing process, dust must be strictly controlled to prevent dust from affecting the consistency of the battery. The level of dust control in the processing workshops of Ningde Times is equivalent to that of medical treatment. The mixed paste will be coated in the copper foil coating process. This step is the last step, and the stirred slurry is evenly sprinkled on the bottom of the 4000 meters of copper foil at a speed of 80 meters per minute. The copper foil before coating is only 6 microns thick, which can be described as thin silkworm wings. Coating is essential to ensure that the thickness and components of the electrodes are consistent, otherwise it will affect the consistency of the battery. The coating must also ensure that no particles, debris, and dust are mixed into the pole. Otherwise, the battery will discharge too quickly, and even cause safety hazards. The negative film on the copper foil is first pressed up and down, and then cut. Cold pressed and pre-cut. In the rolling workshop, the electrode plate with positive and negative data is connected to the roller for rolling, so that the coated data is more dense and improved. Energy density ensures the consistency of thickness. On the other hand, dust and humidity are further controlled. According to the size of the battery to be processed, cut the cold-pressed electrode sheet to fully control the appearance of burrs (the burrs can only be seen clearly under a microscope). The purpose of this is to prevent the burr from penetrating the gap, causing serious safety hazards. The positive and negative tabs on the battery poles are cut out, and the die-cutting and split tab die-cutting process uses a die-cutting mechanism to make the tabs into a conductive battery. We know that batteries are divided into positive and negative electrodes. The tabs are separated from the metal conductor by the battery. The positive and negative tabs of the battery are the contact points when the battery is charged and discharged. The next step is to cut the battery with a cutting knife. Complete the winding process of the prototype battery. Here, the positive electrode, negative electrode and separator of the battery are combined in a winding manner to form a bare battery. Advanced CCD visual inspection equipment can complete active detection and active correction to ensure a good position of the battery pole. CATL Ningde battery processing workshop is one of the most active battery processing workshops in the world with the help of CCD visual inspection equipment. Removing moisture and injecting electrolyte into baking and injecting water is the enemy of the battery system. The process of battery baking is to make the inside of the battery meet the water standard to ensure that the battery has good functions throughout its life cycle. Liquid injection is to inject electrolyte into cells. Electrolyte is like blood flowing in cells, and the exchange of energy is the exchange of charged ions. These charged ions are transported from the electrolyte to the other electrode, where they are charged and discharged. The injection volume of electrolyte is the key point. If the injection volume of electrolyte is too large, it will cause the battery to heat up or even directly fail. If the injection volume is too small, it will affect the cycle of the battery. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.