Excessive charging and discharging of lithium-ion batteries will result in permanent damage to the positive and negative electrodes.
Excessive discharge causes the carbon sheet structure of the negative electrode of the lithium battery to collapse, and the collapse will prevent lithium ions from being inserted during the charging process of the lithium battery and overcharging the lithium battery will result in too much lithium ion; be integrated into the carbon structure of the negative electrode. As a result, some lithium ions can no longer be released, which will damage the lithium battery.
Detailed information:
The final discharge voltage of lithium-ion batteries is 2.75V~3.0V (domestic battery manufacturers give the operating voltage range or the discharge voltage final, each parameter is slightly different, generally 3.0 ~ 2.75V, iron phosphor is 2.5V).
Continuing to discharge below 2.5V (iron phosphor 2.0V) is called overdischarge (the international standard is a minimum of 3.2V, iron phosphor 2.8V at low voltage or self-discharge reaction will cause lithium). ions Active substances are broken down and destroyed and are not necessarily restored. Any form of overcharging lithium-ion batteries will result in serious damage to battery performance or even an explosion.
Baidu Encyclopedia - Lithium Battery
What are the maximum and general discharge operating current, charging current and operating voltage of a lithium battery? lithium iron phosphate
Generally, the working voltage of lithium battery is 3.7V and the termination voltage is 3.2V; the operating voltage of the lithium battery fer phosphate is 3.26 V and the termination voltage is 2.5 V.
Lithium battery is a primary battery that uses lithium metal or alloy lithium as the negative electrode material and uses a non-aqueous electrolyte solution. It is similar to rechargeable lithium batteries. Ion batteries and lithium-ion batteries are different. The inventor of lithium batteries is Edison. Since the chemical properties of lithium metal are very active, the processing, storage and use of lithium metal are subject to very high environmental requirements. Therefore, lithium batteries have not been used for a long time.
Lithium batteries are generally divided into two categories:
Lithium metal batteries: Lithium metal batteries generally use manganese dioxide as a material cathode, metallic lithium or other. A battery that uses a metal alloy as the negative electrode material and uses a non-aqueous electrolyte solution.
Lithium ion battery: Lithium ion battery generally uses lithium alloy metal oxide as the positive electrode material, graphite as the negative electrode material, and non-aqueous electrolyte.
Causes of lithium battery explosion:
1. Great internal polarization.
2. The pole piece absorbs water and reacts with the electrolyte.
3. The quality and performance issues of the electrolyte itself.
4. When injecting liquid, the amount of liquid injected does not meet the process requirements.
5. The sealing performance of laser welding during the assembly process is poor., air leakage, leakage when measuring air leakage.
6. Dust and dust from the pole pieces can easily causemicro-short circuits.
7. The positive and negative electrode sheets are thicker than the process array and difficult to insert into the shell.
8. Liquid injection sealing problem, poor sealing performance of steel balls leads to air swelling.
9. The incoming shell material has a thicker shell wall, and shell deformation affects the thickness.
1. The working current of lithium iron phosphate battery is generally 1C, the maximum is 15C.
2. Charging current is the same as operating current, generally 1C, the maximum is 15C.
3. The general operating voltage of standard lithium iron phosphate batteries is 3.2V; the maximum operating voltage is 3.65V.
Lithium iron phosphate:
Lithium iron phosphate electrode material is mainly used in dvarious lithium-ion batteries. Since the Japanese NTT first revealed the olivine-structured lithium battery cathode material of AyMPO4 (A is an alkali metal, M is a combination of CoFe: LiFeCoPO4) in 1996, John B. Goodenough of the 'Texas State University in the United States in 1997 and others. research groups also subsequently reported the reversible transfer and desorption of lithium characteristics from LiFePO4.
The United States and Japan coincidentally published the structure of olivine (LiMPO4), which attracted great attention to this material and caused extensive research and rapid development. Compared with traditional lithium-ion secondary battery cathode materials, LiMn2O4 spinel structure and LiCoO2 layered structure, LiMPO4 has wider sources of raw materials, is cheaper and has no environmental pollution.
Lithium iron phosphate battery:
Lithium iron phosphate battery refers to a lithium-ion battery using lithium iron phosphate as the positive electrode material. The cathode materials of lithium ion batteries mainly include lithium cobalt oxide, lithium manganate, lithium nickel oxide, ternary materials, lithium iron phosphate, etc. Among them, lithium cobalt oxide is the cathode material currently used in most lithium-ion batteries.