CR2032 button cell.Lithium-ion battery principle and process flow

　　1. Principle

　　1.0 Positive electrode structure Li-ion battery principle and process flow Model aircraft lithium battery High-rate lithium battery Polymer lithium battery LiCoO2 (lithium cobalt oxide) + conductive agent (acetylene black) + adhesive (pVDF) + current collector (aluminum foil) positive electrode 2.0 negative electrode Structure graphite + conductive agent (acetylene black) + thickener (CMC) + binder (SBR) + current collector (copper foil) working principle of negative electrode 3.0

　　3.1 Charging process Lithium-ion battery principle and process flow Model aircraft lithium battery high-rate lithium battery polymer lithium battery power supply charges the battery. At this time, the electrons e on the positive electrode run from the external circuit to the negative electrode, and the positive lithium ions Li+ "jump" from the positive electrode. "Entering" the electrolyte, "crawling" through the winding holes in the diaphragm, "swimming" to reach the negative electrode, and combining with the electrons that have run over long ago. The reaction that occurs on the positive electrode is LiCoO2=charge=Li1-xCoO2+Xli++Xe (electrons) and the reaction that occurs on the negative electrode is 6C+XLi++Xe=====LixC6

　　3.2 Battery discharge process Lithium-ion battery principle and process flow Model aircraft lithium battery High-rate lithium battery Polymer lithium battery

　　Discharge includes constant current discharge and constant resistance discharge. Constant current discharge actually involves adding a variable resistor in the external circuit that changes with the voltage. The essence of constant resistance discharge is to add a resistor to the positive and negative terminals of the battery to allow electrons to pass. It can be seen that as long as the electrons on the negative electrode cannot run from the negative electrode to the positive electrode, the battery will not discharge. Both electrons and Li+ move at the same time, in the same direction but in different paths. During discharge, the electrons run from the negative electrode through the electronic conductor to the positive electrode. The lithium ions Li+ "jump" into the electrolyte from the negative electrode and "climb" across the separator. small hole, "swim" to reach the positive electrode, and combine with the electrons that have run over long ago.

　　2. Process Flow Lithium-ion Battery Principle and Process Flow Model Aircraft Lithium Battery High Rate Lithium Battery Polymer Lithium Battery

　　3. Battery defective items and causes: Lithium-ion battery principle and process flow Model aircraft lithium battery High-rate lithium battery Polymer lithium battery

　　1. Principle and process of low-capacity lithium-ion battery. Reasons for the production of high-rate lithium polymer lithium battery for model aircraft lithium battery: a. The amount of attached material is too small; b. The amount of attached material on both sides of the pole piece is greatly different; c. The pole piece is broken. ; d. Less electrolyte; e. Low electrolyte conductivity; f. The positive and negative electrodes are not matched properly; g. The porosity of the separator is small; h. Aging of the adhesive → attachment material falls off; i. The core of the roll is too thick (not Drying or the electrolyte is not penetrated) j. It is not fully charged when dividing the volume; k. The specific capacity of the positive and negative electrode materials is small.

　　2. Principle and process flow of lithium-ion batteries with high internal resistance. Reasons for the production of high-rate lithium polymer lithium batteries for model aircraft lithium batteries: a. Welding between the negative electrode sheet and the tab; b. Welding between the positive electrode sheet and the tab; c. Positive tab Welding with the cap; d. Welding between the negative ear and the shell; e. The internal resistance of the contact between the rivet and the pressure plate is large; f. No conductive agent is added to the positive electrode; g. The electrolyte does not contain lithium salt; h. The battery has been short-circuited; i. The separator Paper porosity is small.

　　3. Principle and process of low-voltage lithium-ion battery, lithium-ion battery for model aircraft, high-rate lithium battery, polymer lithium battery. Causes: a. Side reaction (decomposition of electrolyte; impurities in positive electrode; presence of water); b. Incomplete formation (SEI film) Safety has not been established); c. The customer's circuit board leaks (referring to the cells returned after processing by the customer); d. The customer did not spot weld as required (the cells after processing by the customer); e. Burrs; f. Micro short circuit; g. The negative electrode produces dendrites.

　　4. The principle and process of ultra-thick lithium-ion batteries. The reasons for the ultra-thickness of high-rate lithium-ion polymer lithium batteries for model aircraft lithium batteries are as follows: a. Weld leakage; b. Electrolyte decomposition; c. Not dried. Moisture; d. The sealing performance of the cap is poor; e. The shell wall is too thick; f. The shell is too thick; g. The core is too thick (too many attachments; the pole piece is not compacted; the diaphragm is too thick).

　　5. The causes are as follows: lithium-ion battery principle and process flow: lithium battery, high-rate lithium battery, polymer lithium battery a. Not well formed (SEI film is incomplete and dense); b. Baking temperature is too high → adhesive Aging → stripping; c. Low specific capacity of the negative electrode; d. More positive electrode materials and less negative electrode materials; e. Cap leakage and weld leakage; f. Electrolyte decomposes and conductivity decreases.

　　6. Principle and process of explosive lithium-ion battery. Lithium battery for model aircraft. High-rate lithium battery. Polymer lithium battery. a. The sub-capacity cabinet is faulty (causing overcharge); b. The diaphragm closing effect is poor; c. Internal short circuit.

　　7. Short-circuit lithium-ion battery principle and process flow Model aircraft lithium battery high-rate lithium battery polymer lithium battery a. Material dust; b. Broken during shelling; c. Scratch (the small diaphragm paper is too small or not padded properly); d . Uneven winding; e. Not wrapped properly; f. There are holes in the diaphragm; g. Burrs

　　8. Principle and process of open-circuit lithium-ion battery Lithium battery for aircraft model High-rate lithium battery Polymer lithium battery a) The tabs and rivets are not welded well, or the effective solder joint area is small; b) The connecting piece is broken (the connecting piece is too short or connected with The pole piece is welded too far down during spot welding)

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