The production process of polymer lithium battery is a complex and delicate process involving multiple key steps and highly specialized technologies. The following is an overview of the production process of polymer lithium battery:
1. Material preparation
Preparation of positive and negative electrode materials: Positive electrode materials usually include compounds such as lithium cobalt oxide and lithium iron phosphate, while negative electrode materials are mainly graphite. These materials need to go through process steps such as mixing, grinding, and screening to ensure that their particles are uniform and of high purity.
Electrolyte preparation: The electrolyte of polymer lithium battery is made by dissolving polymers and salts in organic solvents. During the preparation process, parameters such as solution concentration, temperature, and stirring speed need to be strictly controlled to ensure the stability of the electrolyte.
2. Electrode preparation
Coating: The mixed positive and negative electrode materials are coated on aluminum foil or copper foil respectively to form positive and negative electrodes. The coating process requires precise control of the thickness and uniformity of the materials.
Drying: The coated electrodes need to be dried in a dryer to remove moisture and volatiles in the solvent to ensure the stability of the electrodes.
3. Battery Assembly
Alignment and Separator: Align the positive electrode with the negative electrode and place a separator between them to prevent the positive and negative electrodes from directly contacting and causing a short circuit.
Winding or Lamination: Assemble the positive and negative electrodes and the separator together by winding or lamination to form a battery core. This process requires precise control of the tension and position of the electrodes and separators.
Packaging: Place the battery core in polyimide (PI) or polymer film and seal it in aluminum foil or copper foil to form a battery package. The packaging process needs to ensure that the internal sealing of the battery is good to prevent electrolyte leakage.
4. Testing and Grading
Performance Testing: Conduct electrical performance tests on the manufactured batteries, including capacity testing, charge and discharge testing, cycle life testing, and high and low temperature testing. These tests can reflect the performance of the battery under different environments.
Grading: Grading the batteries according to the test results to ensure that the batteries shipped meet the performance requirements and quality standards.
In summary, the production process of Polymer lithium battery is a highly precise and complex process that requires strict control of process parameters and quality standards at all links. Only in this way can we produce Polymer lithium battery products with excellent performance, safety and reliability.
