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Lithium ion batteries are a common item in our daily lives, and they are also prone to some minor faults, such as low battery capacity, high internal resistance, excessive thickness, abnormal battery formation, battery explosion, battery short circuit, battery open circuit, etc. So, what are the reasons for these faults?

Reason for low capacity failure of lithium-ion batteries: insufficient amount of attached materials; There is a significant difference in the amount of material attached to both sides of the polarizer; Pole fracture; Insufficient electrolyte; Low electrolyte conductivity; The positive and negative electrodes are not properly matched; The porosity of the diaphragm is small; Adhesive aging; Material detachment; The core is too thick and not fully charged during capacity division; The positive and negative electrode materials have a smaller specific capacity.

Reason for high internal resistance fault in lithium-ion batteries: virtual soldering between the negative electrode and the electrode ear; Virtual welding between positive electrode plate and pole ear; False welding between positive electrode ear and cover cap; Negative electrode ear and shell virtual welding; The contact resistance between rivets and pressure plates is high; No conductive agent added to the positive electrode; The electrolyte does not contain lithium salts; The battery has experienced a short circuit; The porosity of diaphragm paper is small.

Reasons for low voltage faults in lithium-ion batteries: side reactions (electrolyte decomposition; impurities in the positive electrode; presence of water); Not well formed (S film not formed safely); Customer's circuit board leakage (referring to the battery cells returned by the customer after processing) The customer did not spot weld according to the requirements (the battery cells processed by the customer); Burrs; Micro short circuit; Dendritic crystals appear on the negative electrode.

Cause of over thickness fault: Welding seam leakage; Electrolyte decomposition; Undrying moisture; Poor sealing of the cap; The shell wall is too thick; The shell is too thick; The core of the coil is too thick (there are too many attachments; the electrode is not compacted; the diaphragm is too thick).

Reason for abnormal lithium-ion battery formation: not well formed (incomplete and dense S film); The baking temperature is too high; Adhesive aging; Material removal; Negative electrode has low specific capacity; Lithium ion batteries have more positive electrode materials and less negative electrode materials; Cap leakage, weld leakage; Electrolyte decomposition leads to a decrease in conductivity.

Reason for explosion of lithium-ion batteries: Fault in the divider (causing overcharging); Poor diaphragm closure effect; Internal short circuit.

What are the common faults of lithium-ion batteries?

Internal resistance of the battery; The positive and negative electrodes of lithium-ion batteries are not soldered properly during welding, or the internal resistance of the rivet in contact with the pressure plate is too high, which can greatly affect the internal resistance of lithium-ion batteries. The small pores of the separator can also affect the internal resistance of the battery.

Battery voltage; In the production process of lithium-ion batteries, impurities are mixed into the positive electrode, and dendrites appear on the negative electrode, which can cause a decrease in the voltage of the lithium-ion battery. Incomplete formation of SEI film during the formation process can also cause low voltage in lithium-ion batteries.

Abnormal temperature; If the temperature of a lithium-ion battery is abnormal during charging or discharging, such as being too high. The reason for this situation may be a slight short circuit phenomenon inside the lithium-ion battery.

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