The principle and process of lithium ion battery are introduced

Principle of lithium ion battery and lithium ion battery of the technological process principle and process, the principle of a 1.0 LiCoO2 positive structure (cobalt acid lithium) + conductive agent (acetylene black) (PVDF) + + adhesive fluid (aluminum foil) 2.0 cathode structure of graphite anode + conductive agent (acetylene black) + thickening agent (CMC) + binder (SBR) + working principle of the fluid (copper foil) negative 3.0 3.1 power source to recharge the battery charging process, on the positive electron e running on the cathode through an external circuit is lithium ion Li + "jump" from the positive electrolyte, "climb" diaphragm winding holes, Swimming reaches the negative pole and combines with electrons that have already come running. On the positive

Principle and process flow of lithium ion battery

Principle and process flow of lithium ion battery

A, principle

1.0 anode construction

LiCoO2(lithium cobalt oxide)+ conductive agent (acetylene black)+ binder (PVDF)+ collector (aluminum foil) anode

2.0 cathode configuration

Graphite + conductive agent (acetylene black)+ thickener (CMC)+ binder (SBR)+ collector (copper foil) anode

3.0 working principle

3.1 charging process

When the power supply charges the battery, the electron e on the positive electrode runs from the external circuit to the negative electrode, and the positive lithium ion Li+ "jumps" into the electrolyte from the positive electrode, "climbs" through the small zigzagging hole on the diaphragm, "swims" to the negative electrode, and combines with the electron that has already come.

The reaction on the positive side is

LiCoO2= charge = li1-xcoo2 +Xli++Xe(electron)

The reaction on the negative pole is

6 c + XLi++ Xe = = = = = LixC6

3.2 battery discharge process

Discharge has constant discharge and constant resistance discharge, constant discharge is actually in the external circuit with a variable resistance can change with the voltage change, the essence of constant resistance discharge is in the battery plus and minus plus a resistance to let the electron through. Thus, as long as the electrons on the negative pole cannot travel from the negative pole to the positive pole, the battery will not discharge. Electrons and Li+ both move in the same direction but in different paths. When an electron is discharged, it runs from the negative pole through the electronic conductor to the positive pole. The lithium ion Li+ "jumps" into the electrolyte from the negative pole, "climbs" through the small zigzagging hole in the diaphragm, "swims" to the positive pole and combines with the electrons that have already come.

Ii. Process flow

Iii. Defective battery items and causes:

1. The capacity is low

Causes:

A. Less supplementary materials; B. There is a big difference in the amount of attached materials between the two sides of the pole sheet; C. Plate fracture;

D. less electrolyte; E. low conductivity of electrolyte; F. The anode and cathode plates are not well matched;

G. small porosity of diaphragm; H. Adhesive aging adhesives fall off; I. excessively thick core (not dried or penetrated by electrolyte)

J. Not fully charged when capacitance is divided; K. Anode and cathode materials are smaller than capacitance.

2. High internal resistance

Causes:

A. Virtual welding of negative plate and pole ear; B. Virtual welding of positive plate and pole ear; C. Blind welding of positive lug and cap;

D. False welding of anode lug and shell; E. Large internal resistance between rivet and press plate; F. No conductive agent is added to the positive electrode;

G. No lithium salts in electrolyte; H. There was a short circuit in the battery; I. diaphragm paper has low porosity.

3. Low voltage

Causes:

A. Side reactions (electrolyte decomposition; Positive pole has impurity; There is water); B. Not properly formed (SEI film is not formed safely);

C. Leakage of the customer's circuit board (refer to the cell returned by the customer after processing); D. The customer fails to spot weld (the cell processed by the customer) as required;

E. burr; F. micro-short circuit; G. The negative electrode produces dendrites.

4. The super thick

The reasons for the overthickness are as follows:

A. Weld leakage; B. Electrolyte decomposition; C. Undried moisture;

D. poor sealing of the cap; E. the shell wall is too thick; F. The shell is too thick;

G. Too thick coil core (too many attachments; Pole sheet not compacted; The diaphragm is too thick.

5. The causes are as follows

A. Incomplete SEI film (incomplete and dense); B. High baking temperature adhesive aging stripping; C. Low negative specific capacity;

D. More positive terminal materials and less negative terminal materials; E. leakage of cap and welding seam; F. Electrolyte decomposition, reduced conductivity.

6. The explosion

A. The sub-container is faulty (resulting in overcharging); B. Poor closing effect of diaphragm; C. internal short circuit

7. A short circuit

A. dust; B. Shell fashion is broken; C. Ruler scraping (small diaphragm paper is too small or not padded);

D. Uneven winding; E. F. The diaphragm has holes; G. burr

8. Open circuit

A) pole ear and rivet are not well welded, or the effective solder joint area is small;

B) the connecting piece is broken (the connecting piece is too short or too close to the pole piece for spot welding)

Principle and process flow of lithium ion battery

Principle and process flow of lithium ion battery

A, principle

1.0 anode construction

LiCoO2(lithium cobalt oxide)+ conductive agent (acetylene black)+ binder (PVDF)+ collector (aluminum foil) anode

2.0 cathode configuration

Graphite + conductive agent (acetylene black)+ thickener (CMC)+ binder (SBR)+ collector (copper foil) anode

3.0 working principle

3.1 charging process

When the power supply charges the battery, the electron e on the positive electrode runs from the external circuit to the negative electrode, and the positive lithium ion Li+ "jumps" into the electrolyte from the positive electrode, "climbs" through the small zigzagging hole on the diaphragm, "swims" to the negative electrode, and combines with the electron that has already come.

The reaction on the positive side is

LiCoO2= charge = li1-xcoo2 +Xli++Xe(electron)

The reaction on the negative pole is

6 c + XLi++ Xe = = = = = LixC6

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