The charging cut-off voltage of lithium batteries does not require testing and is not defined by the manufacturer. This is the safe voltage of the battery itself. The battery voltage after disconnection depends on the battery performance. If the performance is good, it will be very close to the battery parameter value when it leaves the factory. For example, the best battery voltage marked by. the manufacturer is 12.5. After using 12.76 to fully charge and turn on the light, the battery voltage will be around 12.5. That's it
What types of testing and certification are generally required for lithium batteries?
Various standards for lithium batteries mainly examine the safety and electrical performance of lithium batteries from three angles: 1. Battery use safety Performance 2. Environmental adaptability 3. Electrical performance. DiffMany standards focus on battery testing: IEC61960 mainly focuses on electrical performance testing of lithium batteries; Japanese IEC62133 and JISC8714 requirements focus on product use safety and environmental adaptability safety. Covers performance testing; UL2054 and UL1642 comprehensively examine the safety of cells and batteries in various usage environments, including breakdown conditions, high pressure conditions and combustion conditions.
Reliability testing of lithium batteries also includes 1. Service life 2. Discharge characteristics at different rates 3. Discharge characteristics at different temperatures 4. Charging characteristics 5. Self-discharge characteristics 6 . Self-discharge characteristics at different temperatures 7. Storage Storage characteristics 8. Over-discharge characteristics 9.Internal resistance characteristics at different temperatures 10. High temperature test 11. Temperature cycle test 12. Drop test 13. Vibration test 14. Capacity distribution test
Required to test batteries at lithium in mobile phones, use the battery test module as the connection. The shrapnel microneedle module can achieve stable current transmission. It is also a reliable method in the field of small steps. The lifespan can reach more than 20W. has good connection and current transmission capabilities. Stable and reliable, it can meet the testing needs of mobile phone lithium batteries.
Take 3C lithium batteries as an example: appearance test
3C lithium batteries are mainly used in square aluminum batteries and soft batteries, and batteries cylindrical are rarely used. The purpose of the appearance test is to check whether theThe appearance of the battery is intact, whether there is corrosion on the surface and observe whether the battery is leaking or bulging. For square batteries with aluminum shell, it is also necessary to do this. confirm whether there is any pitting or deformation in the aluminum shell, and whether the poles are deformed, symmetry phenomena, etc.
Performance test
3C lithium battery performance test is one of the necessary parts of the test, including life, rate, high discharge and low temperature, safety test, etc.
1. Lifespan
The cycle count of a 3C lithium battery reflects the number of times the battery can be repeatedly charged and discharged. Depending on the environment in which 3C lithium batteries are used, the service life can test the battery life at low temperature, normal temperature and high temperature.
2. Rate
In today's busy life, the requirements for fast charging of 3C lithium batteries are also getting higher and higher. Therefore, the performance of 3C lithium batteries needs to be tested.
3. High and low temperature discharge test
In the high and low temperature test environment, the 3C lithium battery is charged and discharged after the charge and discharge cycle is completed, the curve and the data. are preserved. Compare it with the curve and data at normal temperature to see if it meets what is stated in the specifications.
4. Safety Test
The safety test of 3C lithium batteries includes overcharge, overdischarge, short circuit, dropping, heating, vibration, extrusion, acupuncture, etc. Foreign objects actively damage the battery to test battery safety.
The 3C lithium battery test has a strongtransmission current requirement. The maximum rated voltage of Kaizhitong shrapnel microneedle module is 50A, which satisfies the 3C lithium battery test well and has stable performance.